EP3691985B1 - Method for constructing a lift assembly with increasing usable lifting height - Google Patents

Description

The present invention relates to a method for erecting at least two elevators in a building which is in its construction phase, the usable lifting heights of these elevators being gradually adapted to an increasing height of the building.

Instead of only starting with the installation of these elevators when the building in its construction phase allows the installation of the elevators with their ultimately intended lifting heights, the elevators will already be installed in an earlier construction phase as soon as some floors of the building and the necessary elevator shafts with the appropriate Height are created. The usable lifting heights of such elevators can be adapted to the current building height during the construction of the building, so that the elevators grow with the building and can be used for the vertical transport of people or material during the building's construction phase. This means that elevators specially designed for transport tasks during the construction phase - for example those that are attached to the outside of the building - can be wholly or partially saved.

From the WO2011048275 Such an elevator installation method is known in which an elevator with an elevator drive machine, an elevator car and a counterweight is installed in a designated elevator shaft as soon as several lower floors of the building and an elevator shaft assigned to the elevator with a corresponding height are built. The elevator car and the counterweight of the elevator are suspended from a drive platform that includes the elevator drive machine, at least one suspension element being guided from the elevator car via at least one drive pulley of the drive machine to the counterweight, and the drive platform being raised to the next higher level by means of a lifting device, if the current building height makes an increase in the usable lifting heights of the elevator systems appear appropriate. The guide rails of the elevator system are successively attached from an assembly platform during the construction phase in the elevator shaft, so that the drive platform for the purpose of adapting the usable lifting height of the elevator along these guide rails can be lifted in the elevator shaft. The drive platform can then be supported on load-bearing elements of the elevator shaft at a desired higher level by means of support beams that can be extended from the drive platform.

A lifting platform is used to raise the drive platform and is fixed as far as possible above the drive platform in the elevator shaft before the drive platform is lifted. The lifting platform is equipped with deflection rollers, over which deflection rollers traction means of a hoist mounted on the drive platform are guided. With the help of this hoist, the drive platform is raised together with at least the elevator car in the elevator shaft to a new level adapted to the current building height and supported there. In the final state of the elevator system, the drive platform is used as the machine room floor of the finished elevator system.

The WO2011048275 however, does not contain any indication of a possibility of simplifying or reducing costs in elevator systems in which several elevators are installed in the same building with a usable lifting height that can be adapted to the increasing height of the building.

From the US20100018809 an elevator arrangement and a safety structure as well as methods for elevator assembly are known, which mainly relate to the use and securing of at least one so-called assembly platform. According to one exemplary embodiment, the assembly platform is used to install elevators which are arranged in elevator shafts lying next to one another in a building which is in its construction phase. Each of the elevators comprises a drive platform with a drive machine, which drive machine supports and drives the elevator car. In order to adapt the usable lifting heights of the elevators to an increasing height of the building, the assembly platforms in the respectively assigned elevator shaft are raised, among other things.

The present invention is based on the object of specifying a cost-saving method for erecting elevator systems which comprise several elevators, the usable lifting height of which can be adapted to a building height that increases during the construction phase.

The object is achieved in a method for erecting at least two elevators in a building that is in its construction phase, the usable lifting heights of these elevators being gradually adapted to an increasing height of the building, with each of the at least two elevators in an elevator shaft assigned to it of the building is arranged and comprises a drive platform with an elevator drive machine, which elevator drive machine carries and drives an elevator car and a counterweight via a traction sheave and at least one flexible support means, with lifting operations being carried out to adjust the usable lifting heights, in which one of the drive platforms of the at least two elevators in the assigned elevator shaft is raised to a higher level and locked there, and a single lifting platform is used to carry out these lifting operations, which is temporarily above the respective drive platform to be lifted m is fixed in the assigned elevator shaft and forms a support structure via which the lifting force required to raise the drive platform is transmitted to the load-bearing elements of the elevator shaft.

The invention is therefore based on the idea of dispensing with the provision of several lifting platforms in an elevator system with several elevators whose usable lifting heights are adjusted by gradually raising the drive platform by moving a single lifting platform to a position above the drive platform to be lifted - or . Above the elevator shaft assigned to this drive platform - is moved. Such a transfer of the lifting platform can take place in each case before or after the lifting platform is raised to a new, higher building level. Since a very stable lifting platform with an adjustable support device and with at least one drive platform hoist is required for lifting a drive platform with elevator car, counterweight and elevator support means, the method according to the invention and the elevator system according to the invention have the advantage that their use can achieve considerable cost savings.

In the present document, the term “elevator shaft” should be understood to mean a room in a building that is in its construction phase, its height increases in accordance with the construction progress, the space being dimensioned and designed in such a way that an elevator car and a counterweight of one elevator each can move up and down along vertical carriageways in the space. Such an elevator shaft can be a single shaft enclosed by shaft walls. However, it can also be part of a coherent room in which the lanes of an elevator car and a counterweight of one of the at least two elevators arranged parallel to one another are arranged, with no shaft wall between the lanes of adjacent elevators, but usually steel girders for fastening of elevator components are available.

In the present document, the term “traction means” is to be understood as any elongate and slack component suitable for transmitting tensile forces, for example wire ropes, belts or chains.

In the following, the term "transfer" is to be understood as transporting a lifting platform from an elevator shaft that delivers the lifting platform into an elevator shaft that receives the lifting platform, which transport is usually a lifting in the delivering elevator shaft, a sideways movement between the two elevator shafts and a lowering or lifting in the receiving elevator Includes elevator shaft.

According to an advantageous embodiment of the invention, a drive platform hoist with drive platform pulling means is installed on the lifting platform to raise the drive platforms, the drive platform pulling means being coupled to the drive platform to be lifted in order to carry out a lifting process. The arrangement of the drive platform lifting mechanism on the single lifting platform has the advantage that only a single drive platform lifting mechanism is required to lift the drive platforms of the at least two elevators.

In a further possible embodiment of the invention, a drive platform hoist with a drive platform pulling device is installed on each of the drive platforms to lift the drive platforms to be lifted drive platform is coupled to the lifting platform positioned above this drive platform.
This embodiment has the advantage that the single lifting platform that is temporarily to be fixed above the drive platform to be lifted in the elevator shaft can be shifted more easily and thus more simply.

In a further possible embodiment of the invention, a transfer of the lifting platform between the elevator shafts of the at least two elevators concerned is carried out for alternately lifting the at least two drive platforms, for which purpose the lifting platform is driven on a first lifting platform traction means driven by a first lifting platform hoist and on a second lifting platform driven by a second lifting platform hoist Lifting platform traction means is suspended and the transfer of the lifting platform is effected by coordinated actuation of the two lifting platform lifting mechanisms.
This embodiment has the advantage that the lifting platform can be transferred in a particularly simple and cost-effective manner, since cable pull devices that can be used as lifting platform hoists are usually used in elevator assemblies and no additional auxiliary devices - such as horizontal guides - have to be installed for the displacement process.

In a further possible embodiment of the invention, in order to carry out the transfer of the lifting platform, the first lifting platform traction means is guided from a first lifting platform lifting mechanism installed on the lifting platform via a first deflecting body arranged on this approximately above the center of gravity of the lifting platform to a first suspension point, which is above the lifting platform is supported approximately in the cross-sectional center of the elevator shaft releasing the lifting platform on this elevator shaft, and the second lifting platform traction means is guided by the second lifting platform lifting mechanism, which is also installed on the lifting platform, via a second deflecting body arranged on this approximately above the center of gravity of the lifting platform to a second suspension point, which is supported on this elevator shaft above the lifting platform approximately in the cross-sectional center of the elevator shaft receiving the lifting platform.
With this arrangement of the lifting platform traction means, the transfer of the lifting platform from a position above the lifting platform can be carried out in a simple manner dispensing elevator shaft to a position above the elevator shaft receiving the lifting platform.

In a further possible embodiment of the invention, the first lifting platform traction means are fixed to the first suspension point and the second lifting platform traction means are fixed to the second suspension point, or the first lifting platform traction means is via a first lifting platform traction means pulley arranged at the first suspension point and the second lifting platform traction means is attached via a Second suspension point arranged second lifting platform traction means deflection roller returned to the lifting platform and fixed there.
These two variants of the arrangement of the lifting platform traction means, according to which either a 1: 1 suspension or a 2: 1 suspension of the lifting platform is formed, allow either a somewhat faster transfer of a relatively light lifting platform or a somewhat slower transfer of a relatively heavy lifting platform.

In a further possible embodiment of the invention, in order to transfer the lifting platform from the elevator shaft delivering the lifting platform to the elevator shaft receiving the lifting platform, the lifting platform is lifted from its support points in a first step by pulling the first lifting platform traction means into the first lifting platform lifting mechanism, and in a second step by pulling it in of the second lifting platform traction means in the second lifting platform lifting mechanism, the lifting platform is pivoted around the first suspension point as the pivot center to approximately the cross-sectional center of the elevator shaft receiving the lifting platform, and in a third step the lifting platform is pulled in or out of at least the second lifting platform traction means into the second or out of the second lifting platform hoist brought to the intended vertical position in the elevator shaft receiving the lifting platform.
This sequence of the transfer of the lifting platform carried out with the aid of the two lifting platform lifting mechanisms is particularly simple and requires a relatively low expenditure of time.

In a further possible embodiment of the invention, the lifting platform is transferred from the elevator shaft that delivers the lifting platform to the elevator shaft that receives the lifting platform in a first step by pulling it in of the first lifting platform traction means in the first lifting platform lifting mechanism, the lifting platform is raised vertically, wherein or after which the second lifting platform traction means is held taut or tightened by being pulled into the second lifting platform lifting mechanism, and in a second step the lifting platform is opened by letting out the first lifting platform traction mechanism from the first lifting platform lifting mechanism about the second suspension point as a pivot center to approximately the cross-sectional center of the elevator shaft receiving the lifting platform, and in a third step the lifting platform is pivoted to the vertical position provided for it by pulling in or letting out at least the second lifting platform pulling means into the second or from the second lifting platform lifting mechanism brought to the elevator shaft receiving the lifting platform.

In a further possible embodiment of the invention, in order to transfer the lifting platform from the elevator shaft delivering the lifting platform to the elevator shaft receiving the lifting platform, the lifting platform is raised vertically in a first step by pulling the first lifting platform traction means into the first lifting platform hoist. In a second step, the lifting platform is pivoted by pulling the second lifting platform traction means into the second lifting platform lifting mechanism around the first suspension point as the pivoting center to approximately the middle between the mentioned elevator shafts. In a third step, the lifting platform is pivoted by letting the first lifting platform pulling device out of the first lifting platform lifting gear around the second suspension point as the pivoting center up to approximately the cross-sectional center of the elevator shaft receiving the lifting platform, and in a fourth step the lifting platform is pivoted by pulling in or out of at least the second lifting platform pulling device brought into the second or from the second lifting platform hoist in the vertical direction to its intended vertical position in the elevator shaft receiving the lifting platform.
In this course of the transfer of the lifting platform carried out with the aid of the two lifting platform lifting mechanisms, a sideways displacement results with considerably fewer vertical components, and the transfer can be carried out with shorter lifting platform traction means.

In a further possible embodiment of the invention, during the lateral displacement of the lifting platform which forms part of the transfer, the two Lifting platform hoists operated alternately several times in order to effect an approximately straight lateral displacement of the lifting platform.

In a further possible embodiment of the invention, the suspension points, at which the first and second lifting platform traction means are fixed or deflected, are arranged on at least one protective platform, which is temporarily installed vertically displaceable in the area of the upper ends of the at least two elevator shafts that move upwards during the construction phase and is supported. This attachment of the suspension points of the lifting platform traction means in the area of the at least two elevator shafts has the advantage that it can be implemented with little effort because when installing elevators whose usable lifting heights are gradually adapted to an increasing height of the building, such protective platforms in each of the elevator shafts must be present anyway.

In a further possible embodiment of the invention, at least one safety traction means is installed as a fall protection for the lifting platform during the transfer process, which is fixed on the one hand to the lifting platform, from the lifting platform to a safety traction means deflection pulley attached in the area of one of the suspension points for the lifting platform traction means and then back to the lifting platform and guided through a pulling device safety device attached to the lifting platform, which pulling device locking device blocks the safety pulling device and thus a lowering of the lifting platform if a speed at which the safety pulling device moves through the safety catching device exceeds a certain limit.
With such a fall protection, the risk of personal injury and material damage when transferring the lifting platform can be significantly reduced, and thanks to the guidance of the safety pulling device via a safety pulling device pulley, any load on the pulling device and the pulling device catching device is advantageously halved.

In a further possible embodiment of the invention, one of the lifting processes in which one of the drive platforms of the at least two elevators is alternately raised to a higher level is carried out before it is carried out a corresponding lifting of the lifting platform within one of the at least two elevator shafts is carried out by at least one of the lifting platform lifting mechanisms with the associated lifting platform traction means guided to a suspension point. This ensures that there is a sufficient distance between the lifting platform and the drive platform to be lifted in order to be able to implement the lifting process in which the drive platform is raised by an intended lifting distance.

In a further possible embodiment of the invention, at least one shock-absorbing element in the form of an elastic roller or an elastic buffer is mounted on the side of the lifting platform.
This prevents the lifting platform from colliding with elements of an elevator shaft from leading to damage when the lifting platform is shifted sideways or when it is lifted.

In a further possible embodiment of the invention, a transfer of the lifting platform from one of the at least two elevator shafts to another of the at least two elevator shafts is carried out for alternately lifting the at least two drive platforms, the lifting platform along a substantially horizontally arranged track temporarily installed for this transfer is moved.
Although such a transfer requires a little extra effort for the installation of the horizontally arranged track, it is a suitable alternative method for a situation in which the method of transfer with a sideways displacement by pivoting the lifting platform on vertically arranged lifting platform traction means cannot be carried out.

In a further possible embodiment of the invention, the drive platform lifting mechanism installed on the lifting platform or a lifting platform lifting mechanism used to lift the lifting platform is used as the drive for moving the lifting platform sideways along the horizontally arranged track, the traction means of the drive platform lifting mechanism or the lifting platform lifting mechanism being arranged in such a way that it extends essentially horizontally from the respective lifting mechanism to a fastening point present in the area of the elevator shaft receiving the lifting platform.

When using the lifting platform lifting gear, after the lifting platform has been raised, the lifting platform would have to be coupled to a sliding chassis in order to be able to free the lifting platform traction means for lateral displacement.
This embodiment has the advantage that the sideways displacement of the lifting platform along a horizontally arranged roadway does not require any additional drive device.

Fig. 1

zeigt eine zur Anwendung des erfindungsgemässen Verfahrens geeignete Aufzugsanlage mit drei einer zunehmenden Gebäudehöhe anpassbaren Aufzügen.

Fig. 2

zeigt im Wesentlichen einen vergrösserten Ausschnitt aus der Darstellung der Aufzugsanlage gemäss Fig. 1, mit anderer Anordnung des Antriebsplattformhubwerks und mit einer ersten Ausführungsform des Verfahrens zum Transferieren der Hebeplattform von einem die Hebeplattform abgebenden Aufzugsschacht zu einem die Hebeplattform empfangenden Aufzugsschacht.

Fig. 3 - 6

zeigen im Wesentlichen vergrösserte Ausschnitte aus der Darstellung der Aufzugsanlage gemäss Fig. 1, mit jeweils einer weiteren Ausführungsform des Verfahrens zum Transferieren der Hebeplattform.

In the following, exemplary embodiments of the invention are explained with reference to the accompanying drawings. Components that have the same effect are denoted by the same reference symbols in all figures.

Fig. 1

shows an elevator system suitable for the application of the method according to the invention with three elevators that can be adapted to an increasing building height.

Fig. 2

shows essentially an enlarged section from the illustration of the elevator installation according to FIG Fig. 1 , with a different arrangement of the drive platform hoist and with a first embodiment of the method for transferring the lifting platform from an elevator shaft that delivers the lifting platform to an elevator shaft that receives the lifting platform.

Fig. 3-6

show essentially enlarged excerpts from the illustration of the elevator system according to FIG Fig. 1 , each with a further embodiment of the method for transferring the lifting platform.

Fig. 1 shows in a schematic elevation an elevator system 1 which comprises three elevators 3.1, 3.2, 3.3 arranged in a row next to one another in a building 2. The building 2 is in its construction phase, and the three elevators 3.1, 3.2, 3.3 are designed so that their usable lifting heights can be adapted to an increasing height of the building 2 by a drive platform that is assigned to one of the elevators and forms a temporary machine room 5 is designed to be liftable. Each of the three elevators 3.1, 3.2, 3.3 is arranged in an assigned elevator shaft 6.1, 6.2, 6.3. Each of the elevator shafts 6.1, 6.2, 6.3 can be enclosed by four vertical shaft walls 7, or it can be part of a common shaft space, the elevator shafts 6.1, 6.2, 6.3 usually being separated from one another by steel girders 8 on which at least guide rails for elevator cars 9 and counterweights 10 are attached. A situation is shown in which the drive platforms 5 of two of the three elevators 3.1, 3.2, 3.3 are still positioned at a lower level corresponding to an earlier building height, and in which the drive platform 5 of the third elevator is already at a higher level that is adapted to the current building height Level was raised and locked there.

Each of the three elevators 3.1, 3.2, 3.3 comprises a drive platform 5 which is vertically displaceable along the assigned elevator shaft 6.1, 6.2, 6.3 and is provided with a protective roof 11 and serves as a support for an elevator drive machine 14 provided with a traction sheave 13. Furthermore, each of the elevators 3.1, 3.2, 3.3 comprises an elevator car 9 and a counterweight 10, which are carried by the elevator drive machine 14 via the traction sheave 13 and at least one support means 15 and are driven along guide rails (not shown here). A first strand 15.1 of the suspension element 15 is guided from the traction sheave 13 of the elevator drive machine 14 via a deflection roller 16 arranged on the drive platform 5 to a cage support roller 19 on the elevator cage 9 and then to a first fixed point 20 on the drive platform 5, and a second strand 15.2 of the suspension element 15 is guided from the drive pulley 13 to a counterweight carrier roller 21 on the counterweight 10 and then to a second fixed point 22 on the drive platform 5. After the second fixed point 22, which is designed as a detachable suspension element clamp, the second strand 15.2 of the suspension element 15 is guided around a deflection roller 23 arranged on the drive platform 5 and then down to a suspension element store 24. When the usable lifting height of an elevator is adapted to an increasing height of the building 2 - ie when the drive platform 5 is raised - the additional required amount of suspension elements can be supplied from this suspension element store 24, the elevator car 9 being coupled to the drive platform before the drive platform is raised, the counterweight 10 is supported in the area of the lower end of the elevator shaft and the support means clamp forming the second fixed point 22 can be released. So that the drive platforms 5 of the three elevators 3.1, 3.2, 3.3 can be raised and locked again at higher levels in their elevator shaft 6, each of the three drive platforms 5 comprises support devices 25 with retractable and extendable support beams 26, via which support devices the drive platforms on support points 27 are supportable. Such support points are for example by shaft wall niches 28 or by arranged between the elevator shafts Steel beam 8 is formed.

A single lifting platform 30, which is temporarily fixed in the elevator shaft above the drive platform 5 to be lifted, is used to carry out the lifting operations, in which one of the drive platforms 5 of the three elevators is alternately raised along its respective elevator shaft 6 to a higher level and locked there. To fix or lock the lifting platform 30 in one of the elevator shafts 6.1, 6.2, 6.3, in the present example the lifting platform 30 is also equipped with support devices 31 which comprise retractable and extendable support beams 32. Via these support devices 31, the lifting platform 30 can also be supported on the support points 27, which are formed by shaft wall niches 28 or by steel girders 8 arranged in the elevator shafts. The lifting platform 30 forms a sufficiently stable supporting structure via which the lifting force, which is required to lift the drive platform 5, which usually weighs several thousand kilograms, can be transmitted to support points 27 formed by supporting elements of the elevator shaft 6. A drive platform hoist 33 with a drive platform pulling means 34 is advantageously installed on the lifting platform 30, the drive platform pulling means 34 being coupled to the drive platform 5 to be lifted in order to carry out a lifting process in which the associated drive platform is raised.

In an alternative embodiment of the installation method, a drive platform hoist 33 with a drive platform pulling means 34 can be mounted on each of the drive platforms 5, the drive platform pulling means of the drive platform hoist of the drive platform to be lifted being coupled to the respective lifting platform positioned above this drive platform in order to lift one of the drive platforms. This embodiment is in Fig. 2 illustrated and related to Fig. 2 explained.

So that in all three elevators 3.1, 3.2, 3.3 the lifting operations required for the purpose of adapting to a current building height can be carried out to raise the drive platforms 5, as shown in FIG Fig. 1 recognizable - the only lifting platform 30 in each case from the elevator shaft that delivers the lifting platform by at least one lateral shift into the one receiving the lifting platform Elevator shaft transferred. There the lifting platform 30 is either supported on the elevator shaft at the previous level above the drive platform 5 present in the receiving elevator shaft or raised to a new level adapted to the current building height and supported there. The devices required for lifting and sideways displacement of the lifting platform as well as different embodiments of the transfer or the sideways displacement are shown below with reference to FIG Figures 2 to 6 explained in more detail.

Fig. 2 shows essentially an enlarged section of the elevator system according to FIG Fig. 1 . In contrast to Fig. 1 However, the lifting platform 30 does not have a drive platform hoist here, but rather a drive platform hoist 33 with associated drive platform traction means 34 is mounted on each of the drive platforms 5 to lift all the drive platforms 5, whereby the drive platform traction means 34 of the drive platform hoist 33 of the drive platform 5 to be lifted is attached to the above to perform a lifting process this drive platform positioned lifting platform 30 is coupled.

Fig. 2 serves mainly to illustrate the mode of operation of a first embodiment of the method for transferring the lifting platform 30 from one of the elevator shafts 6.1, 6.2, (6.3) into another elevator shaft. On the lifting platform 30, two cable pulling devices - referred to below as the first and second lifting platform lifting gear 36, 37 - are fixed. The first lifting platform lifting mechanism 36 cooperates with a first lifting platform hoisting mechanism 38, and the second lifting platform lifting mechanism 37 cooperating with a second lifting platform lifting mechanism 39 in order to be able to raise the lifting platform by coordinated actuation of the lifting platform lifting mechanisms and to be able to move it sideways. The lifting platform hoists 36, 37 are preferably driven by electric motors. A collecting container 43 is attached to the lifting platform 30 below the lifting platform hoists 36, 37. In this collecting container, the loose sections of the lifting platform traction means 38, 39 are collected, which are ejected from the lifting platform lifting mechanisms when the supporting sections of the lifting platform traction means are drawn into the lifting platform lifting mechanisms 36, 37.

The first lifting platform traction means 38 is guided from the first lifting platform lifting mechanism 36 to a first suspension point 40 and fastened there. This first suspension point 40 is supported on this elevator shaft above the starting position of the lifting platform 30 in the area of the cross-sectional center of the elevator shaft dispensing the lifting platform. The second lifting platform traction means 39 is guided from the second lifting platform lifting mechanism 37 to a second suspension point 41 and is also fastened there. This second suspension point 41 is supported at approximately the same height as the first suspension point 40 above the lifting platform 30 in the area of the cross-sectional center of the elevator shaft receiving the lifting platform 30 on this elevator shaft. A deflecting body 50 is mounted on the lifting platform 30 above each of the two lifting platform hoists 36, 37. These deflection bodies 50, which are preferably designed as rollers, have the task of guiding the lifting platform traction means 38, 39, which are deflected in variable directions to the respective suspension point during the transfer of the lifting platform, in the correct direction to the lifting platform lifting mechanisms. The support for the suspension points 40, 41 is preferably at least one vertically displaceable support structure forming a protective platform 45, which is temporarily installed and supported in the area of the upper ends of the at least two elevator shafts 6.1, 6.2 that move upwards during the construction phase. Such a protective platform 45 must be present anyway to protect the assembly personnel from falling objects.

To transfer the lifting platform 30 from the elevator shaft 6.1 that delivers the lifting platform to the elevator shaft 6.2 that receives the lifting platform here, in a first step the lifting platform 30 is lifted from its support points 27 by pulling the first lifting platform traction means 38 into the first lifting platform lifting mechanism 36. In a second step, by pulling the second lifting platform traction means 39 into the second lifting platform lifting mechanism 37, the lifting platform is pivoted around the first suspension point 40 as the pivot center to approximately the cross-sectional center of the elevator shaft 6.2 receiving the lifting platform 30, and in a third step the lifting platform is pulled in or out brought from at least the second lifting platform traction means into the second or from the second lifting platform lifting mechanism to the vertical position provided for it in the elevator shaft 6.2 receiving the lifting platform. The arrow 53 marks the angle through which the first lifting platform traction means 38 and the arrow 56 marks the angle through which the second lifting platform traction means 39 are pivoted in the course of the lateral displacement which forms part of the transfer. Mark the arrows 57 the path of the lifting platform 30 during its sideways displacement. The arrow 55 marks the angle through which the second lifting platform traction means 39 is pivoted as a result of the lifting of the lifting platform in the first step, and the arrow 54 marks the angle through which the first lifting platform traction means 38 is pivoted as a result of the illustrated lowering of the lifting platform in the third step.
After the lifting platform is supported and secured in the elevator shaft 6.2 that receives it, it can be used to lift the elevator shaft 6.2 - currently positioned at a lower level and therefore in Fig. 2 not visible - drive platform can be used. Such a transfer of the lifting platform 30 can take place in each case before or after the lifting platform is raised to a new, higher building level. By repeating the transfer described, the lifting platform 30 can also be moved between elevator shafts 6.1, 6.2, 6.3, between which at least one further elevator shaft is arranged.

Fig. 3 essentially also shows an enlarged section of the elevator installation according to FIG Fig. 1 . It serves to illustrate the mode of operation of a further embodiment of the method for transferring the lifting platform 30 from one of the elevator shafts 6.1, 6.2, (6.3) into another elevator shaft. In contrast to the representation in Fig. 2 Here, a drive platform lifting mechanism 63 with associated drive platform traction means 34 is mounted on the lifting platform 30 and is used to raise the drive platforms 5 of at least two elevators to a higher level. To lift one of the drive platforms 5, the lifting platform 30 is positioned and supported above the drive platform 5 to be lifted in the associated elevator shaft, after which the drive platform traction means 34 of the drive platform hoist 63 mounted on the lifting platform 30 is coupled to the drive platform 5 to be lifted.

Also in the embodiment according to Fig. 3 On the lifting platform 30, two cable pulling devices, which are preferably driven by electric motors and are designated as the first and second lifting platform lifting gear 36, 37, are fixed. The first lifting platform lifting mechanism 36 cooperates with a first lifting platform hoisting mechanism 38, and the second lifting platform lifting mechanism 37 cooperating with a second lifting platform lifting mechanism 39 in order to be able to raise the lifting platform by coordinated actuation of the lifting platform lifting mechanisms and to be able to move it sideways. Below the lifting platform hoists 36, 37 a collecting container 43 is attached to the lifting platform 30 in the present embodiment as well. In this collecting container, the loose sections of the lifting platform traction means 38, 39 are collected, which are ejected from the lifting platform lifting mechanisms when the supporting sections of the lifting platform traction means are drawn into the lifting platform lifting mechanisms 36, 37.

The first lifting platform traction means 38 is guided from the first lifting platform hoist 36 to a first suspension point 40 and fastened there, this first suspension point 40 being supported above the starting position of the lifting platform 30 in the area of the cross-sectional center of the elevator shaft that delivers the lifting platform on this elevator shaft. The second lifting platform traction means 39 is guided from the second lifting platform lifting mechanism 37 to a second suspension point 41 and is also fastened there, this second suspension point 41 being at approximately the same height as the first suspension point 40 above the lifting platform 30 in the area of the cross-sectional center of the elevator shaft receiving the lifting platform 30 this elevator shaft is supported. In the embodiment described here, too, a deflecting body 50, preferably designed as a roller, is mounted on the lifting platform 30 above each of the two lifting platform lifting mechanisms 36, 37. These deflection bodies 50 have the task of guiding the lifting platform traction means 38, 39, which are deflected during the transfer of the lifting platform in variable directions to the respective suspension point, in the correct direction to the lifting platform lifting mechanisms. Here, too, at least one protective platform 45, which is designed as a vertically displaceable support structure, preferably serves as a support for the suspension points 40, 41. This protective platform, which is also essential to protect the assembly personnel from falling objects, is preferably temporarily installed and supported in the area of the upper ends of the at least two elevator shafts 6.1, 6.2 that move upward during the construction phase.

To transfer the lifting platform 30 from the elevator shaft 6.1 that delivers the lifting platform to the elevator shaft 6.2 that receives the lifting platform here, in a first step the lifting platform 30 is lifted from its support points 27 by pulling the first lifting platform traction means 38 into the first lifting platform lifting mechanism 36. In this case or afterwards, the second lifting platform traction means 39 is held essentially taut by being pulled into the second lifting platform lifting mechanism 37 or tightened. In a second step, by letting the first lifting platform pulling means 38 out of the first lifting platform lifting mechanism 36, the lifting platform 30 is pivoted about the pivot center formed by the second suspension point 41 to approximately the cross-sectional center of the elevator shaft 6.2 receiving the lifting platform 30. In a third step, the lifting platform 30 is then brought into or out of the second lifting platform hoist 37 to the intended vertical position in the elevator shaft 6.2 receiving the lifting platform by pulling in or out at least the second lifting platform pulling means 39. Also in Fig. 3 the arrow 53 marks the angle through which the first lifting platform traction means 38 and the arrow 56 marks the angle through which the second lifting platform traction means 39 are pivoted in the course of the lateral displacement of the lifting platform 30 which forms part of the transfer. The arrows 57 also mark the path that the lifting platform 30 travels during its sideways displacement according to the embodiment of the method described here. The arrow 55 marks the angle through which the second lifting platform traction means 39 is pivoted as a result of the lifting of the lifting platform in the first step.
After the lifting platform 30 has been supported and secured in the elevator shaft 6.2 receiving it, it can be used to lift the elevator shaft 6.2 that is present in the mentioned elevator shaft - currently positioned at a lower level and therefore in Fig. 3 not visible - drive platform can be used. In this embodiment of the method, too, the lifting platform 30 can be transferred before or after the lifting platform is raised to a new, higher building level. By repeating the transfer described, the lifting platform 30 can also be moved between elevator shafts 6.1, 6.2, 6.3, between which at least one further elevator shaft is arranged.

Fig. 4 essentially also shows an enlarged section of the elevator installation according to FIG Fig. 1 . It serves to illustrate the mode of operation of a further embodiment of the method for transferring a lifting platform 30 from one of the elevator shafts 6.1, 6.2, (6.3) into another elevator shaft.
Also in the embodiment described here, a drive platform hoist 63 with associated drive platform traction means 34 is mounted on the lifting platform 30, which is used to lift one of the drive platforms 5 of the at least two elevators to a higher level adapted to the current building height.

To lift one of the drive platforms 5, the lifting platform 30 is positioned and supported above the drive platform 5 to be lifted in the associated elevator shaft, after which the drive platform traction means 34 of the drive platform hoist 63 mounted on the lifting platform 30 is coupled to the drive platform 5 to be lifted.

Also in the embodiment according to Fig. 4 On the lifting platform 30, two cable pulling devices, which are preferably driven by electric motors and are designated as the first and second lifting platform lifting gear 36, 37, are fixed. The first lifting platform lifting mechanism 36 cooperates with a first lifting platform hoisting mechanism 38, and the second lifting platform lifting mechanism 37 cooperating with a second lifting platform lifting mechanism 39 in order to be able to raise the lifting platform by coordinated actuation of the lifting platform lifting mechanisms and to be able to move it sideways. In the present embodiment, too, a collecting container 43 is attached to the lifting platform 30 below the lifting platform hoists 36, 37. In this collecting container, the loose sections of the lifting platform traction means 38, 39 are collected, which are ejected from the lifting platform lifting mechanisms when the supporting sections of the lifting platform traction means are drawn into the lifting platform lifting mechanisms 36, 37.

In the present embodiment, too, the first lifting platform traction means 38 is guided from the first lifting platform lifting mechanism 36 to a first suspension point 40 and is fastened there, this first suspension point 40 being supported on this elevator shaft above the starting position of the lifting platform 30 in the area of the cross-sectional center of the elevator shaft that delivers the lifting platform is. The second lifting platform traction means 39 is guided from the second lifting platform lifting mechanism 37 to a second suspension point 41 and is also fastened there (the representation of the second lifting platform traction means 39 in the starting position of the lifting platform 30 is interrupted because it would cover the representation of the lifting platform traction means in a subsequent position of the lifting platform) . The second suspension point 41 is supported at approximately the same height as the first suspension point 40 above the lifting platform 30 in the area of the cross-sectional center of the elevator shaft receiving the lifting platform 30 on this elevator shaft. Above each of the two lifting platform hoists 36, 37 a deflecting body 50, preferably designed as a roller, is mounted on the lifting platform 30. This deflector 50 have the The task of guiding the lifting platform traction means 38, 39, which are deflected in variable directions to the respective suspension point, in the correct direction to the lifting platform hoists during the transfer of the lifting platform. Here, too, at least one protective platform 45, which is designed as a vertically displaceable support structure, preferably serves as a support for the suspension points 40, 41. This protective platform, which is also essential to protect the assembly personnel from falling objects, is preferably temporarily installed and supported in the area of the upper ends of the at least two elevator shafts 6.1, 6.2 that move upwards during the construction phase.

To transfer the lifting platform 30 from the elevator shaft 6.1 that delivers the lifting platform to the elevator shaft 6.2 that receives the lifting platform here, in a first step the lifting platform 30 is lifted vertically from its support points 27 by pulling the first lifting platform traction means 38 into the first lifting platform lifting mechanism 36. In a second step, the lifting platform 30 is pivoted by pulling the second lifting platform traction means 39 into the second lifting platform lifting mechanism 37 around the first suspension point 40 as the pivoting center to approximately the middle between the mentioned elevator shafts. In a third step, the lifting platform 30 is pivoted by letting out the first lifting platform pulling means 38 from the first lifting platform lifting mechanism 36 around the second suspension point 41 as the pivoting center up to approximately the cross-sectional center of the elevator shaft receiving the lifting platform, and in a fourth step the lifting platform is pivoted by pulling in or out brought at least the second lifting platform traction means 39 into the second or from the second lifting platform lifting mechanism 37 in the vertical direction to its intended vertical position in the elevator shaft receiving the lifting platform.
The arrow 53 marks the angle through which the first lifting platform traction means 38 is pivoted in the course of the second step, and the arrow 55 marks the angle through which the second lifting platform traction means 39 is pivoted in the course of the second step. The arrow 54 marks the angle through which the first lifting platform traction means 38 is pivoted in the course of the third step, and the arrow 56 marks the angle through which the second lifting platform traction means 39 is pivoted in the course of the third step. The arrow 57.2 here marks the path that the lifting platform 30 covers during the second step, and the arrow 57.3 marks the path that the lifting platform covers during the third step.

After the lifting platform 30 is supported and secured in the elevator shaft 6.2 that receives it, it can be used to lift the elevator shaft 6.2 that is present in the mentioned elevator shaft - currently positioned at a lower level and therefore in Fig. 4 not visible - drive platform can be used. In this embodiment of the method, too, the lifting platform 30 can be transferred before or after the lifting platform is raised to a new, higher building level, and by repeating the transfer described, the lifting platform 30 can also be moved between elevator shafts 6.1, 6.2, 6.3, between which at least one further elevator shaft is arranged.

Out Fig. 4 It is readily apparent to a person skilled in the art that an approximately straight sideways displacement of the lifting platform 30 can be achieved by dividing the second and third steps of the transfer described above into smaller sub-steps. This can be achieved in that the two lifting platform lifting mechanisms 36, 37 are alternately actuated several times during the sideways displacement of the lifting platform.

Fig. 5 essentially also shows an enlarged section of the elevator installation according to FIG Fig. 1 . It serves to illustrate the mode of operation of a further embodiment of the method for transferring a lifting platform 30 from one of the elevator shafts 6.1, 6.2, (6.3) into another elevator shaft.
As with the embodiments according to Fig. 3 and 4th In the embodiment described here, a drive platform lifting mechanism 63 with associated drive platform traction means 34 is mounted on the lifting platform 30, which is used to lift one of the drive platforms 5 of the at least two elevators to a higher level adapted to the current building height. To lift one of the drive platforms 5, the lifting platform 30 is positioned and supported above the drive platform 5 to be lifted in the associated elevator shaft, after which the drive platform traction means 34 of the drive platform hoist 63 mounted on the lifting platform 30 is coupled to the drive platform 5 to be lifted.

Also in the embodiment according to Fig. 5 are on the lifting platform 30 two, preferably driven by electric motors, as the first and second lifting platform lifting gear 36, 37 designated cable devices fixed. The first lifting platform lifting mechanism 36 cooperates with a first lifting platform hoisting mechanism 38, and the second lifting platform lifting mechanism 37 cooperating with a second lifting platform lifting mechanism 39 in order to be able to raise the lifting platform by coordinated actuation of the lifting platform lifting mechanisms and to be able to move it sideways. In contrast to the embodiments described above, here each of the two lifting platform traction means 38, 39 is guided twice, ie each of the two lifting platform traction means forms a so-called 2: 1 traction system. Furthermore, in the present embodiment, securing pulling means 38A and 39A are arranged, which extend essentially parallel to each of the two lifting platform pulling means 38, 39. Details of these features as well as their effects and advantages are explained in the following sections of this description.

In the present embodiment, too, a collecting container 43 is attached to the lifting platform 30 below the lifting platform hoists 36, 37. In this collecting container, the loose sections of the lifting platform traction means 38, 39 are collected, which are ejected from the lifting platform lifting mechanisms when the supporting sections of the lifting platform traction means are drawn into the lifting platform lifting mechanisms 36, 37. In the sectional view of the AA Fig. 5 In addition, shock-absorbing elements 75 attached to the side of the lifting platform 30 can be seen, which are suitable for guiding the lifting platform between shaft walls during the transfer or which are intended to prevent damage in the event of a collision between the lifting platform and walls or other components of the elevator shafts. Such shock-absorbing elements 75 can preferably be attached to all four sides of the lifting platform 30 in all embodiments of the method and can preferably be designed as elastic rollers or elastic buffers.

In the embodiment according to Fig. 5 the first lifting platform traction means 38 is guided from the first lifting platform lifting mechanism 36 to a lifting platform traction means pulley 40.1 forming a first suspension point 40 and then back to a fixing device 65 arranged on the lifting platform in the area of the two lifting platform lifting mechanisms and fastened there. Said first suspension point 40 is supported above the starting position of the lifting platform 30 in the area of the cross-sectional center of the elevator shaft which delivers the lifting platform on this elevator shaft 6.1.

The second lifting platform traction means 39 is guided from the second lifting platform lifting mechanism 37 to a lifting platform traction means pulley 41.1 forming a second suspension point 41 and then back to the aforementioned fixing device 65 and also fastened there. The second suspension point 41 is supported at approximately the same height as the first suspension point 40 above the lifting platform 30 in the area of the cross-sectional center of the elevator shaft 6.2 receiving the lifting platform 30 on this elevator shaft. In the present embodiment, too, a deflecting body 50, preferably designed as a roller, is mounted on the lifting platform 30 above the two lifting platform lifting mechanisms 36, 37. These deflection bodies 50 have the task of guiding the sections of the lifting platform traction means 38, 39, which are deflected by the lifting platform lifting mechanisms and which are deflected in variable directions to the respective suspension point during the transfer of the lifting platform, in the correct direction to the lifting platform lifting mechanisms. Deflection bodies 66 for deflecting the sections of the lifting platform traction means 38, 39 leading to the fixing device 65 are also shown here. As a support for the lifting platform traction means deflection rollers 40.1, 41.1 forming the suspension points 40, 41, at least one protective platform 45, which acts as a vertically displaceable support structure, is also used here is trained. This protective platform, which is also essential to protect the assembly personnel from falling objects, is preferably temporarily installed and supported in the area of the upper ends of the at least two elevator shafts 6.1, 6.2 that move upwards during the construction phase.

The process of transferring the lifting platform 30 from the elevator shaft 6.1 that delivers the lifting platform to the elevator shaft 6.2 that receives the lifting platform here essentially corresponds to that in connection with FIG Fig. 4 described process. In a first step, by pulling the first lifting platform traction means 38 into the first lifting platform lifting mechanism 36, the lifting platform 30 is lifted vertically from its support points 27. In a second step, the lifting platform 30 is pivoted by pulling the second lifting platform traction means 39 into the second lifting platform lifting mechanism 37 around the first suspension point 40 as the pivoting center to approximately the middle between the mentioned elevator shafts. In a third step, the lifting platform 30 is pivoted by letting the first lifting platform pulling means 38 out of the first lifting platform lifting mechanism 36 around the second suspension point 41 as the pivoting center to approximately the cross-sectional center of the elevator shaft receiving the lifting platform, and in a fourth step the lifting platform is brought to its intended vertical position in the elevator shaft receiving the lifting platform by pulling in or out of at least the second lifting platform pulling means 39 into the second or out of the second lifting platform lifting mechanism 37 in the vertical direction.
The arrow 57.2 here marks the path that the lifting platform 30 covers during the second step, and the arrow 57.3 marks the path that the lifting platform covers during the third step.

Of course, in an embodiment with double-guided lifting platform traction means and / or with securing traction means, the transfer or the lateral displacement can also be carried out in the Fig. 2 and 3 in the manner shown.

After the lifting platform 30 is supported and secured in the elevator shaft 6.2 that receives it, it can be used to lift the elevator shaft 6.2 that is present in the mentioned elevator shaft - currently positioned at a lower level and therefore in Fig. 5 not visible - drive platform can be used. In this embodiment of the method, too, the lifting platform 30 can be transferred before or after the lifting platform is raised to a new, higher building level, and by repeating the transfer described, the lifting platform 30 can also be moved between elevator shafts 6.1, 6.2, 6.3, between which at least one further elevator shaft is arranged.

One advantage of the in Fig. 5 procedure compared to those in Fig. 1-4 The method described consists in that the double-guided lifting platform traction means (2: 1 suspension) halves the tensile forces in the lifting platform traction means, the required drive forces of the lifting platform hoists and the holding forces in the fixing devices of the lifting platform traction means.

The in Fig. 5 The illustrated method for transferring a lifting platform 30 from one of the elevator shafts 6.1, 6.2, (6.3) into another elevator shaft, there are also safety pulling means 38A, 39A, which serve as fall protection for the lifting platform 30 during its transfer and are essentially parallel to the lifting platform pulling means 38 , 39 are arranged. In section AA the Fig. 5 are the im Elevation through the securing traction means 38A, 39A covered by the lifting platform traction means 38, 39 can be seen. Each of the securing traction means is fixed on the one hand to the lifting platform 30 and is moved from the lifting platform 30 to a securing traction means deflection roller 40.2, 41.2 attached in the area of one of the suspension points 40, 41 already provided for the lifting platform traction means 38, 39 and then back to the lifting platform 30 and through a traction device 70, 71 attached to the lifting platform. This traction device 70, 71 blocks the safety traction device and thus a lowering of the lifting platform 30 when a speed or an acceleration at which the safety traction device moves through the safety device exceeds a certain limit. Another advantage of the in Fig. 5 procedure compared to those in Fig. 1-4 The described method is that with the described fall protection, the risk of personal injury and material damage when transferring the lifting platform is significantly reduced. Thanks to the guidance of the safety traction device via a safety traction device pulley (2: 1 suspension), the load on the safety traction device and that of the traction device catching device that occurs when the fall protection device is used is advantageously halved.

Fig. 6 essentially also shows an enlarged section of the elevator installation according to FIG Fig. 1 . It serves to illustrate the mode of operation of a further embodiment of the method for transferring a lifting platform 30 from one of the elevator shafts 6.1, 6.2, (6.3) into another elevator shaft.
As with the embodiments according to Figures 3 to 5 In the embodiment described here, a drive platform hoist 63 with associated drive platform traction means 34 is mounted on the lifting platform 30, which drive platform hoist 63 is used to raise one of the drive platforms 5 of the at least two elevators to be installed in the building to a higher level adapted to the current building height. To lift one of the drive platforms 5, the single lifting platform 30 is positioned and supported above the drive platform 5 to be lifted in the associated elevator shaft, after which the drive platform traction means 34 of the drive platform hoist 63 mounted on the lifting platform 30 is coupled to the drive platform 5 to be lifted.

The embodiment of the method according to Fig. 6 differs from the embodiments according to Fig. 1-5 in that the sideways displacement of the lifting platform 30, which forms part of the transfer, is not achieved by coordinated actuation of two lifting platform hoists acting on two lifting platform traction means. The sideways displacement takes place here by horizontally displacing a horizontal running gear 80 on which the lifting platform 30 is suspended so that it can be raised and lowered. In addition, the lifting platform is raised to a higher level adapted to the progress of the building construction and the lifting and lowering of the lifting platform required to carry out a transfer is carried out by means of a single lifting platform lifting mechanism 36 acting on a single lifting platform traction means 38 From an elevator shaft that delivers the lifting platform to an elevator shaft that receives the lifting platform, the horizontal carriage 80 is preferably shifted along a horizontal track 81 formed by a steel girder, which is temporarily mounted above the lifting platform to be transferred at least between the elevator shaft that delivers the lifting platform and the elevator shaft that receives the lifting platform, and on these elevator shafts is supported. In the embodiment described here, this support of the horizontal carriageway on the elevator shafts takes place preferably via at least one protective platform 45, which is designed as a support structure that can be vertically displaced in the elevator shaft and supported therein. This protective platform, which also serves to protect against falling objects, is preferably temporarily installed in the area of the upper ends of the at least two elevator shafts 6.1, 6.2 that move upward in the course of the construction phase. The only lifting platform lifting mechanism 36, preferably driven by an electric motor, is in the embodiment according to FIG Fig. 6 fixed to the lifting platform 30. However, it could also be mounted on the aforementioned horizontal running gear. The lifting platform hoist 36 cooperates with a lifting platform traction means 38 in order to be able to raise the lifting platform. In the embodiment shown, the lifting platform traction means 38 is guided twice, that is, it forms a so-called 2: 1 traction system in that it moves upwards from the lifting platform lifting mechanism to a lifting platform traction means pulley 40.1 on the horizontal chassis and then back to one on the lifting platform 30 Fixing device 65 is guided and fixed there. Of course, an embodiment with a single-guided or with more than double-guided lifting platform traction means (multiple reeving) is also possible. realizable. Also in the embodiment according to Fig. 6 it is possible and practical to use a safety pulling device with a pulling device catching device (both in Fig. 6 not visible) to be arranged, as has already been done in connection with the embodiment according to Fig. 5 is described. Such a securing traction device extends essentially parallel to the lifting platform traction device 38 and blocks the lifting platform 30 from lowering if the speed at which the securing traction device moves through the traction device catching device exceeds a certain limit. Below the lifting platform lifting mechanism 36, a collecting container 43 is also attached to the lifting platform 30 in the present embodiment, in which the loose section of the lifting platform traction means 38 is collected, which is ejected from the lifting platform lifting mechanism when the load-bearing section of the lifting platform traction mechanism is drawn into the lifting platform lifting mechanism 36.

The drive platform lifting mechanism 63 installed on the lifting platform and used to lift the drive platforms or the lifting platform lifting mechanism 36 installed on the lifting platform 30 and used to raise the lifting platform is preferably used as the drive for moving the lifting platform 30 sideways along the horizontal track 81. The traction means 34 of the drive platform hoist or the traction means 38 of the lifting platform hoist 36 is arranged so that it extends essentially horizontally from the respective hoist to a fastening point 83 present in the area of the elevator shaft receiving the lifting platform.

Claims (15)

1. Method for constructing at least two elevators (3.1, 3.2, 3.3) in a building (2) under construction, the usable lifting heights of said elevators being adapted incrementally to an increasing height of the building,
   each of the at least two elevators (3.1, 3.2, 3.3) being arranged in an elevator shaft (6.1, 6.2, 6.3) of the building (2) associated with the elevator and comprising a drive platform (5) having an elevator drive machine (14), which elevator drive machine supports and drives an elevator car (9) and a counterweight (10) by means of a traction sheave (13) and at least one flexible suspension means (15), and, in order to adapt the usable lifting heights, lifting operations being performed, in which one of the drive platforms (5) of the at least two elevators (3.1, 3.2, 3.3) is alternately lifted to a higher level in the associated elevator shaft (6.1, 6.2, 6.3) and is locked there,
   characterized in that,
   in order to perform said lifting operations, a single lifting platform (30) is used, which is temporarily fastened above the particular drive platform (5) to be lifted, in the elevator shaft (6.1, 6.2, 6.3) associated with said drive platform, and which forms a supporting construction, by means of which a lifting force required to lift the drive platform (5) is transferred to supporting elements of the elevator shaft (6.1, 6.2, 6.3).
2. Method according to claim 1, characterized in that
   a drive platform hoist (33) having a drive platform traction means (34) is installed on the lifting platform (30) in order to lift the drive platforms (5), the drive platform traction means (34) being coupled to the particular drive platform (5) to be lifted in order to perform a lifting operation.
3. Method according to claim 1, characterized in that
   a drive platform hoist (33) having a drive platform traction means (34) is installed on each of the drive platforms (5) in order to lift the drive platforms (5), the drive platform traction means (34) of the drive platform hoist (33) of the drive platform (5) to be lifted being coupled to the lifting platform (30) positioned above said drive platform in order to perform a lifting operation.
4. Method according to any of claims 1 to 3, characterized in that
   the lifting platform (30) is transferred between the elevator shafts (6.1, 6.2, 6.3) of the at least two elevators (3.1, 3.2, 3.3) in order to alternately lift the at least two drive platforms (5), for which purpose the lifting platform (30) is suspended on a first lifting platform traction means (38) driven by a first lifting platform hoist (36) and on a second lifting platform traction means (39) driven by a second lifting platform hoist (37), and the transfer of the lifting platform (30) is effected by a coordinated actuation of the two lifting platform hoists (36, 37).
5. Method according to claim 4, characterized in that
   the first lifting platform traction means (38) is guided from the first lifting platform hoist (36) installed on the lifting platform (30) to a first suspension point (40) and attached there, said first suspension point (40) being supported above the lifting platform (30) in the region of the cross-sectional center of the elevator shaft (6.1, 6.2, 6.3) delivering the lifting platform (30) by said elevator shaft, and in that the second lifting platform traction means (39) is guided from the second lifting platform hoist (37) also installed on the lifting platform (30) to a second suspension point (41) and attached there, the second suspension point (41) being supported above the lifting platform (30) in the region of the cross-sectional center of the elevator shaft (6.1, 6.2, 6.3) receiving the lifting platform (30) by said elevator shaft.
6. Method according to claim 4, characterized in that
   the first lifting platform traction means (38) is guided from the first lifting platform hoist (36) installed on the lifting platform (30) to a first suspension point (40), there wraps around a first lifting platform traction means deflection roller (40.1), is returned to the
   lifting platform (30) and is attached thereto, the first
   suspension point (40) being supported above the lifting platform (30) in the region of the cross-sectional center of the elevator shaft (6.1, 6.2, 6.3) delivering the lifting platform (30) by said elevator shaft, and in that
   the second lifting platform traction means (39) is guided from the second lifting platform lifting hoist (37) also installed on the lifting platform (30) to a second suspension point (41), there wraps around a second lifting platform traction means deflection roller (41.1), is returned to the lifting platform (30) and is attached thereto, the second suspension point (41) being supported above the lifting platform in the region of the cross-sectional center of the elevator shaft (6.1, 6.2, 6.3) receiving the lifting platform (30) by said elevator shaft.
7. Method according to claim 6, characterized in that,
   in order to transfer the lifting platform (30) from the elevator shaft (6.1, 6.2, 6.3) delivering the lifting platform to the elevator shaft (6.1, 6.2, 6.3) receiving the lifting platform, the lifting platform (30), in a first step, is lifted off its support points (27) by retracting the first lifting platform traction means (38) into the first lifting platform hoist (36),
   in that, in a second step, the lifting platform (30) is pivoted about the first suspension point (40) as a pivot center approximately into the cross-sectional center of the elevator shaft (6.1, 6.2, 6.3) receiving the lifting platform by retracting the second lifting platform traction means (39) into the second lifting platform hoist (37), and in that, in a third step, the lifting platform (30) is moved to its intended vertical position in the elevator shaft (6.1, 6.2, 6.3) receiving the lifting platform (30) by retracting or extending at least the second lifting platform traction means (39) into or from the second lifting platform hoist (37).
8. Method according to claim 6, characterized in that,
   in order to transfer the lifting platform (30) from the elevator shaft delivering the lifting platform to the elevator shaft (6.1, 6.2, 6.3) receiving the lifting platform, the lifting platform (30), in a first step, is lifted vertically by retracting the first lifting platform traction means (38) into the first lifting platform hoist (36), after which the second lifting platform traction means (39) is kept substantially taut or is tightened by retracting into the second lifting platform hoist (37), in that, in a second step, the lifting platform (30) is pivoted about the second suspension point (41) as a pivot center approximately into the cross-sectional center of the elevator shaft (6.1, 6.2, 6.3) receiving the lifting platform (30) by extending the first lifting platform traction means (38) from the first lifting platform hoist (36), and in that, in a third step, the lifting platform (30) is moved to its intended vertical position in the elevator shaft (6.1, 6.2, 6.3) receiving the lifting platform (30) by retracting or extending at least the second lifting platform traction means (39) into or from the second lifting platform hoist (37).
9. Method according to claim 6, characterized in that,
   in order to transfer the lifting platform (30) from the elevator shaft (6.1, 6.2, 6.3) delivering the lifting platform to the elevator shaft (6.1, 6.2, 6.3) receiving the lifting platform, the lifting platform, in a first step, is lifted vertically by retracting the first lifting platform traction means (38) into the first lifting platform hoist (36), in a second step, the lifting platform (30) is pivoted about the first suspension point (40) as a pivot center approximately to the middle between said elevator shafts (6.1, 6.2, 6.3) by retracting the second lifting platform traction means (39) into the second lifting platform hoist (37), in a third step, the lifting platform (30) is pivoted about the second suspension point (41) as a pivot center approximately into the cross-sectional center of the elevator shaft (6.1, 6.2, 6.3) receiving the lifting platform (30) by extending the first lifting platform traction means (38) from the first lifting platform hoist (36), and in a fourth step, the lifting platform (30) is moved to its intended vertical position in the elevator shaft (6.1, 6.2, 6.3) receiving the lifting platform (30) by retracting or extending at least the second lifting platform traction means (39) into or from the second lifting platform hoist (37).
10. Method according to any of claims 7 to 9, characterized in that the two lifting platform hoists (36, 37) are actuated several times alternately during the sideways movement of the lifting platform (30), which forms part of the transfer, in order to effect an approximately linear sideways movement of the lifting platform (30).
11. Method according to any of claims 5 to 10, characterized in that
    the suspension points (40, 41), at which the first and second lifting platform traction means (38, 39) are fastened or deflected, are arranged on at least one protective platform (45) which is installed in a vertically movable manner in and supported by the region of the upper ends of the at least two elevator shafts (6.1, 6.2, 6.3), which move upward during the construction phase.
12. Method according to any of claims 5 to 11, characterized in that
    at least one safety traction means (38A, 39A) is mounted as fall protection for the lifting platform (30) during the transfer process, which safety traction means is fastened to the lifting platform (30), is guided from the lifting platform to a safety traction means deflection roller (40.2, 41.2) attached in the region of one of the suspension points (40, 41) for the lifting platform traction means (38, 39), and subsequently is guided back to the lifting platform (30) and through a traction means safety catch (70, 71) attached to the lifting platform, said traction means safety catch blocking the safety traction means (38A, 39A) and thus preventing a lowering of the lifting platform (30) when a speed, at which the safety traction means moves through the traction means safety catch (70, 71), exceeds a specific limit.
13. Method according to any of claims 5 to 12, characterized in that,
    prior to performing one of the lifting operations, in which one of the drive platforms (5) of the at least two elevators (3.1, 3.2, 3.3) is alternately lifted to a higher level, the lifting platform (30) is lifted correspondingly within one of the at least two elevator shafts (6.1, 6.2, 6.3) by at least one of the lifting platform hoists (36, 37) with the associated lifting platform traction means (38, 39) guided to a suspension point (40, 41).
14. Method according to any of claims 4 to 13, characterized in that
    at least one shock-absorbing element (75) in the form of a resilient roller or a resilient buffer is mounted on at least one side of the lifting platform (30).
15. Method according to claim 1, characterized in that,
    in order to alternately lift the at least two drive platforms (5), the lifting platform (30) is transferred from one of the at least two elevator shafts (6.1, 6.2, 6.3) to another of the at least two elevator shafts, the lifting platform (30) being moved along a horizontal track (81) temporarily installed for said transfer.

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