NL2018789B1 - Marine transfer platform, and method for vertical transfer of at least one person or goods using the marine transfer platform. - Google Patents
Marine transfer platform, and method for vertical transfer of at least one person or goods using the marine transfer platform. Download PDFInfo
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- NL2018789B1 NL2018789B1 NL2018789A NL2018789A NL2018789B1 NL 2018789 B1 NL2018789 B1 NL 2018789B1 NL 2018789 A NL2018789 A NL 2018789A NL 2018789 A NL2018789 A NL 2018789A NL 2018789 B1 NL2018789 B1 NL 2018789B1
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- transfer platform
- marine transfer
- marine
- wire
- platform
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- 238000000034 method Methods 0.000 title claims description 17
- 230000033001 locomotion Effects 0.000 claims abstract description 73
- 230000007246 mechanism Effects 0.000 claims abstract description 34
- 230000005484 gravity Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims 7
- 230000005540 biological transmission Effects 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 claims 1
- 239000002775 capsule Substances 0.000 description 12
- 238000005259 measurement Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 5
- 230000006978 adaptation Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000008685 targeting Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B27/00—Arrangement of ship-based loading or unloading equipment for cargo or passengers
- B63B27/16—Arrangement of ship-based loading or unloading equipment for cargo or passengers of lifts or hoists
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B27/00—Arrangement of ship-based loading or unloading equipment for cargo or passengers
- B63B27/30—Arrangement of ship-based loading or unloading equipment for transfer at sea between ships or between ships and off-shore structures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/02—Devices for facilitating retrieval of floating objects, e.g. for recovering crafts from water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/28—Other constructional details
- B66D1/40—Control devices
- B66D1/48—Control devices automatic
- B66D1/52—Control devices automatic for varying rope or cable tension, e.g. when recovering craft from water
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- Jib Cranes (AREA)
Abstract
A marine transfer platform for the vertical transfer of persons or goods between a first structure, and a second floating structure comprises a first driving mechanism reeling in and reeling off a first wire, a first connecting member connecting the first wire to the first structure, a second driving mechanism reeling in and reeling off a second wire, a second connecting member connecting the second wire to the second structure, and a synchronizing device for mutually adjusting the reeling in and reeling off of the first and second wires. During travel of the platform between the first and second structure the motion of the platform is gradually transformed to adapt from the motion of one of the first structure and the second structure from which is being travelled to the motion of the other one of the first structure and the second structure to which is being travelled.
Description
Technical Field
The present invention relates to a marine transfer platform and a marine transfer method for the substantially vertical transfer of at least one person or goods between a first structure and a second structure, at least one of the first structure and the second structure being floating and being movable due to waves.
Background art
The transfer of persons or goods in an offshore environment is challenging. Other than is the case on shore, marine structures may be moved by waves. If this movement is not taken into account during transfer to or from marine structures, the impact load upon first contact can be large. For example, during transfer from an off-shore platform to a ship, the relative motion between the structures poses a significant physical danger to persons, such as personnel. The key aspects to consider are the safety and the comfort of the persons involved. Impact load as well as sudden movements are preferably avoided as much as possible.
Helicopters may be used for marine transfer of persons and goods. A helicopter lands on a specially installed platform on the structure to which personnel is to be transferred, such as a ship. A helicopter is operable to take into account some movement due to waves, and can be operated to reduce impact load upon landing. However, a transfer with a helicopter is limited due to wind speed, extent of the landing structure platform motions and local visibility. Other disadvantages of helicopter transfers are the high costs and the safety-training and safety preparations required by the personnel or other persons being transferred.
WO 2016/130002 A1 discloses a marine transfer method and system for the transfer of persons or goods between a first structure and a second structure of which at least one structure is floating and is movable due to waves. The system comprises a transfer platform for carrying the human or goods, and the platform is substantially vertically movable in use from the first structure to the second structure, and vice versa.
During the travel between the first and second structure, the motion of the platform is gradually transformed to adapt from the motion of a departure structure to the motion of the structure to which is being travelled.
-2Thereto, the system is provided with a first and second winch on the first structure. The platform is suspended from the first winch and guided with a substantially vertical guiding wire suspended from the second winch. The substantially vertical guiding wire is connected to the second structure, and the second winch is controlled to keep the substantially vertical guiding wire in use continuously under tension.
The method and system according to WO 2016/130002 A1 require significant structural adaptations of at least the first structure. Both the first and the second winch need to be mounted to the first structure. The system is therefore not easily transferrable from one structure to another structure, i.e., for example, it cannot easily be transferred from one offshore platform to another off-shore platform.
US 2015/0096485 A1 discloses a crew ship for transporting personnel to and from an off-shore platform which is equipped with a passenger capsule and a basket-like cradle, which retains the passenger capsule adjacent a passenger deck during voyage. The passenger capsule is equipped with its own automated heave compensation system, power supply, and stabilization means. The passenger capsule is equipped to be lifted and lowered onto the cradle using platform-mounted cranes. In one embodiment, the capsule has the ability to self-winch from below a crane hook. Once positioned above the cradle, the capsule lowers itself into the cradle synchronizing with the vessel’s heave motion, whereby the height differences are monitored using a laser targeting system.
As the capsule comprises its own winch and laser targeting system, the capsule is easily transferrable to and from any off-shore platform that is equipped with a platformmounted crane. No structural adaptations of the off-shore platform are necessary.
However, due to the specified landing station, i.e. the cradle, the capsule needs to be positioned exactly above the cradle before lowering the capsule. In case of severe sideward movement of the ship due to waves or of the capsule due to wind, landing the capsule exactly into the cradle may be difficult or even impossible.
Summary of invention
The present invention aims to overcome the abovementioned drawbacks.
Accordingly, an object of the invention is to provide a marine transfer method wherein impact load during landing on a moving structure as well as sudden movements during arrival at, and departure from a moving structure are preferably avoided as much as possible.
A further object of the invention is to provide a marine transfer platform, e.g. for a transfer of persons and/or goods between an off-shore platform and a ship, which can be used in conjunction with any structure, such as an off-shore platform, where a crane is available without having to take additional measures on the structure.
-3A further object of the invention is to provide a marine transfer platform, e.g. for a transfer of persons and/or goods between an off-shore platform and a ship, which can be used in conjunction with any structure which is floating and movable due to waves, such as a ship, without having to take substantive additional measures on the ship.
Another object of the invention is to provide a marine transfer platform and method which can be operated in case of upward, downward and sideward motion of the marine transfer platform movable due to wind, or of a structure which is floating and movable due to waves, e.g. a ship, to and from which is being travelled during transport.
To reach at least one of said objectives, in a first aspect the present invention provides a marine transfer platform for the substantially vertical transfer of at least one person or goods between a first structure and a second structure, at least one of the first structure and the second structure being floating and being movable due to waves, the marine transfer platform comprising:
- a first driving mechanism for reeling in and reeling off a first wire,
- a first connecting member for connecting the first wire to the first structure,
- a second driving mechanism for reeling in and reeling off a second wire,
- a second connecting member for connecting the second wire to the second structure,
- a synchronizing device for mutually adjusting the reeling in and reeling off of the first and second wires such that during travel of the marine transfer platform between the first structure and the second structure the motion of the marine transfer platform is gradually transformed to adapt from the motion of one of the first structure and the second structure from which is being travelled to the motion of the other one of the first structure and the second structure to which is being travelled.
In a second aspect, the present invention provides a marine transfer method for the substantially vertical transfer of at least one person or goods between a first structure and a second structure, at least one of the first structure and the second structure being floating and being movable due to waves, wherein the method comprises
- connecting a marine transfer platform to the first structure with a first wire,
- connecting the marine transfer platform to the second structure with a second wire, and
- moving the marine transfer platform between the first structure and the second structure by reeling the first wire and the second wire at the marine transfer platform, wherein during travel of the marine transfer platform between the first structure and the second structure the reeling in and reeling off of the first and second wires is mutually adjusted such that the motion of the marine transfer platform is gradually transformed to adapt from the motion of one of the first structure and the second structure from which is
-4being travelled to the motion of the other one of the first structure and the second structure to which is being travelled.
In contrast to the prior art, the present invention provides a standalone marine transfer platform, which may comprise a cabin, which can be used for the safe transfer of people or goods in an off-shore environment. The marine transfer platform can be used to move people or goods from or to any first structure, such as an off-shore platform or vessel which is equipped with a lifting device, such as a crane, A-frame of cantilever, and from or to any second structure, such as another off-shore platform, ship or other stationary or moveable structure, which has a clear landing space. At least one of the first structure and the second structure is floating and is movable due to waves. No substantial specific measures need to be taken on the platform or ship in order to operate the marine transfer platform. The marine transfer platform of the present invention can be operated in case of upward, downward and sideward motion of the marine transfer platform or of the second structure. This movement can for example be a movement of the marine transfer platform due to wind, or a movement of a ship due to waves.
Description of embodiments
In a preferred embodiment of the present invention, the marine transfer platform comprises a distance measuring device configured for measuring a distance between the marine transfer platform and the second structure, and the synchronizing device is configured to operate based on a distance measuring signal provided by the distance measuring device.
Because the distance is continuously measured, the speed of moving toward the moving structure, or the speed of moving away from the moving structure, can adequately be adjusted. Furthermore, also the required compensation of the movement can adequately be adjusted. Both adjustments can be made depending on the distance as measured.
In an embodiment, the distance measuring device is configured to measure the length of the second wire. Measuring the length of the second wire can easily be implemented by recording the amount of the second wire which is present on the second driving mechanism, or by measuring the extent of rotation in case the second driving mechanism is a winch, taking into account the winch dimensions. This measurement is not sensitive to rotational motion of either one of the structures. Of course, this measurement is only possible when the second connecting member has been connected to the second structure.
Alternatively, the distance measuring device is an ultrasonic distance measuring device or a laser distance measuring device. The distance to the second structure is
-5determined by the time of flight of reflecting sound or light waves. Such measurements can easily be performed, and are useful at the initial stage of the a transfer process, when the second wire has not yet been lowered onto, and connected to the second structure. The measurement then provides data such that the distance that the second wire has to bridge is known. However, such measurements are susceptive to errors or deviations due to the sideward and/or rotational motion of the second structure relative to the marine transfer platform and/or the sideward motion of the marine transfer platform due to wind.
Preferably, measurement of the length of the second wire is combined with either the ultrasonic or the laser distance measurement. This provides for optimum knowledge of the position of the marine transfer platform with respect to the movable second structure during all stages of a marine transfer process.
In an embodiment of the marine transfer platform, the first driving mechanism comprises a first winch for reeling in and reeling off of the first wire. In a further preferred embodiment the second driving mechanism comprises a second winch for reeling in and reeling off of the second wire. Winches provide for space and energy efficient reeling in and reeling off of the wires.
In an embodiment of the marine transfer platform, the first wire is running over a first guiding sheave mounted on the marine transfer platform at or near a vertical (i.e., an imaginary vertical line) through the centre of gravity of the marine transfer platform, when it is in its normal use position. In a further embodiment of the marine transfer platform, the second wire is running over a second guiding sheave mounted on the marine transfer platform at or near a vertical through a centre of gravity of the marine transfer platform, when it is in its normal use position. Placement of the guiding sheaves at or near a vertical through the centre of gravity provides for an adequate measure of keeping the marine transfer platform stable during travel from the first to the second structure and vice versa.
In an embodiment of the marine transfer platform, the second connecting member comprises a third guiding sheave. The second wire is guided by the third guiding sheave.
In an embodiment of the marine transfer platform, the second wire, in particular a free end thereof, may be connected to the first connecting member, when the second connecting member comprises a third guide sheave.
A connection between the second wire and the second structure may be made using gravity by placing the second structure below the first structure and lowering the second wire with the second connecting member. The second connecting member may be a hook which can be connected to a ring or the like which is present on the second structure. For this way of securing the second connecting member to the second structure, intervention of personnel is likely necessary.
-6In a preferred embodiment of the marine transfer platform, the second connecting member comprises a magnetic device for connection of the second connecting member to a part of the second structure being made of a magnetisable material. Offshore structures and vessels or ships are predominantly made of steel, enabling fast and flexible connection with such a magnetic device. This system can be handled unmanned, not requiring personnel being on deck handling the connection. Thus, a safe and simple system is provided that may require no or little adaptation on the second structure. A magnetic connection between the second wire/second connecting member and the second structure does not require any presence of personnel during this relatively dangerous operation and also does not require to connect with any mechanical latch. In some embodiments, a receiving structure may comprise a dedicated structure, such as a plate, made of a magnetizable material. This in turn greatly reduces the station keeping requirements and structure position control of the second structure connecting to the second wire.
In an embodiment of the marine transfer platform, the second connecting member comprises an electromagnet. Such an magnet can easily be switched on and off by providing an electric current. In order to provide the connection between the second wire and the second structure, the magnet needs to be permanently powered through a cable from a power source on the marine transfer platform.
Alternatively, the second connecting member comprises a semi-permanent electromagnet. The magnetic field, and thus the magnetic force exerted by the semipermanent electromagnet is switchable on and off by a short electric pulse. An electric pulse of a few seconds can turn the magnet on and a reverse pulse can turn the magnet off. The magnet may be equipped with a switch to detect contact with the surface of the second structure. Furthermore, an actuator which is situated next to the magnet may press down on the landing surface of the second structure to detect the holding force of the magnet to the landing surface.
Both types of electromagnets have their individual advantages in holding power and control options, thereby enabling a safe and energy efficient system with adequate redundancy.
In an embodiment, the marine transfer platform comprises a cabin for accommodating the at least one person or goods, in particular an open or closed cabin. The persons or goods being transferred are then shielded from the sometimes harsh environment encountered offshore and persons tend to feel more secure and safe. This cabin is preferably configured to provide adequate buoyancy and stability in case there may be an emergency and the cabin gets into the water.
In an embodiment of the marine transfer platform, the synchronizing device is controllable to control the first and the second driving mechanism to keep the first and the
-7second wires in use continuously under tension during travel of the marine transfer platform between the first structure and the second structure. The main benefit of the pretension is the feedback of the relative motion of the structures and the ability to use this as input to the synchronizing device. Relative sideward motions of the structures can be followed simply and effectively during travel of the marine transfer platform. There may exist a gearing or similar connection between the two driving mechanisms enabling the use of a single pretension device pre-tensioning both wires, thereby creating a closed loop system.
In an embodiment of the marine transfer platform, the speed of at least one of the first driving device and the second driving device is controllable to gradually eliminate the relative vertical motion between the marine transfer platform and at least one of the first structure or the second structure. The speed of the driving devices is made controllable in order to compensate the motions of the moving structure(s). This function may also be referred to as a heave compensation function. This is carried out gradually from the motion of one of the first and second structures to the other one of the first and second structures during the transfer. This causes a smooth and safe transfer of a human or goods. When the marine transfer platform arrives at the second structure, there exists near to none relative motion between the second structure and the marine transfer platform ensuring a comfortable and safe demounting from the marine transfer platform onto the second structure. Similarly, when the marine transfer platform departs from the second structure, there exists near to none relative motion between the second structure and the marine transfer platform ensuring a comfortable and safe departure of the marine transfer platform from the second structure. The same applies when the marine transfer platform arrives at, or departs from the first structure.
In a preferred embodiment the synchronizing device gradually transforms the rotations of the first and second driving device. Preferably, the synchronizing device is an adjustable synchronizing device to adjustably transform the rotations of the first and second driving device. The advantage of transforming the rotation, with a single ratio or an adjustable ratio, of the first and second driving devices is that this makes the complete system a closed loop system. The closed loop system is straightforward in its control and loss of marine transfer platform control or marine transfer platform wire control is minimal. It further enables relative simple yet gradually applied active or passive heave compensation by means of a gradual variation of the transformation ratio between the first and second driving devices.
In a typical marine transfer method according to the invention, the marine transfer platform may be resting on the first structure. People can enter onto the marine transfer platform and/or or goods can be loaded. Then, a first wire which is connected to a first
-8driving mechanism and is extending from the top of the platform is connected to a crane with a first connecting member. The crane comfortably lifts the platform and positions it above the second structure. The second connecting member which is suspended from the second wire is let down from the platform by reeling off the second wire by the second driving mechanism. During this operation the marine transfer platform preferably stays at a stable height. When the second connecting member reaches the second structure, it is secured to the second structure. The synchronizing device puts a tension on the second wire and keeps this tension approximately constant by means of an electric or hydraulic tensioning system. Then, the platform is lowered by reeling off the first wire, while keeping the first connecting member in position. The second wire is kept under tension, which may require reeling in or reeling off the second wire. On average, the second wire will be reeled in. Initially, the substantially vertical travel of the marine transfer platform may be kept constant with respect to the first structure, independent from the movement of the second structure. Upon lowering the marine transfer platform, the movement of the platform is gradually adjusted to that of the second structure. Upon arrival of the platform at the second structure, the movement of the platform is adapted to that of the second structure.
These and other aspects of the invention will be more readily appreciated as the same becomes better understood by reference to the following detailed description and considered in connection with the accompanying drawings in which like reference symbols designate like parts.
Brief description of the drawings
Figure 1 is a schematic view of an embodiment of the marine transfer platform according to the invention.
Figure 2 is a schematic view of a first operational stage of a transfer of the marine transfer platform of Figure 1 from the first structure to the second structure.
Figure 3 is a schematic view of a second operational stage of the transfer of the marine transfer platform of Figure 1 from the first structure to the second structure.
Figure 4 is a schematic view of a third operational stage of the transfer of the marine transfer platform of Figure 1 from the first structure to the second structure.
Figure 5 is a schematic view of a fourth operational stage of the transfer of the marine transfer platform of Figure 1 from the first structure to the second structure.
Figure 6 is a schematic view of a fifth operational stage of the transfer of the marine transfer platform of Figure 1 from the first structure to the second structure.
-9Figure 7 is a schematic view of sixth, seventh and eighth operational stages of the transfer of the marine transfer platform of Figure 1 from the first structure to the second structure.
Figure 8 is a schematic view of lateral motion in and around the seventh operational stage of the embodiment of Figure 1.
Figure 9 is a schematic view of operation of a distance measuring device in the embodiment of Figure 1.
Figure 10 is an isometric view of another embodiment of the invention.
Figure 11 is a schematic view of another embodiment of the invention.
Detailed description of embodiments
Figure 1 schematically illustrates an arrangement of basic components of a marine transfer platform 2. The marine transfer platform 2 comprises a frame 4 for supporting people 5 or goods, and for mounting a first driving mechanism 6, a second driving mechanism 8, a first guiding sheave 10 and a second guiding sheave 12. The first driving mechanism 6 is configured for reeling in and reeling off a first wire 14, and may comprise a first winch for this purpose. The second driving mechanism 8 is configured for reeling in and reeling off a second wire 16, and may comprise a second winch for this purpose.
A first connecting member 18 is provided for connecting the first wire 14, running over the first guiding sheave 10, to a first structure. The first structure may comprise a crane for lifting and lowering a hook, wherein the first connecting member 18 is configured for connecting to the hook. As an example, the first connecting member may be a ring secured to a free end of the first wire 14.
A second connecting member 20 is provided for connecting the second wire 16 running over the second guiding sheave 12, to the second structure. The second structure may be a floating structure, for example a ship, wherein the second connecting member 20 is configured for connecting to an upper part of the ship, such as a deck of the ship, or a connecting structure on a deck of the ship.
The second connecting member 20 may comprises a magnetic device 26 for connection of the second connecting member 20 to a part of the second structure being made of a magnetisable material, such as a deck or other landing platform of the second structure. The magnetic device 26 may comprise an electromagnet or a semi-permanent electromagnet. A power supply 28 for the magnetic device 26 and possible other components mounted on the second connecting member 20 may be provided on the marine transfer platform 2. The power supply 28 is connected to the second connecting member 20 through a cable 30. The second connecting member 20 may comprise an actuator 32 which is situated next to the magnetic device 26, and may press down on the landing surface of
- 10the second structure to detect the holding force of the magnetic device 26 to the landing surface.
In other embodiments, the second connecting member may be configured to mechanically, not magnetically, connect to the second structure.
A synchronizing device 22 is provided for mutually adjusting the reeling in and reeling off of the first wire 14 and the second wire 16 such that during travel of the marine transfer platform 2 between the first structure and the second structure the substantially vertical motion of the marine transfer platform 2 is gradually transformed to adapt from the motion of one of the first structure and the second structure from which is being travelled to the motion of the other one of the first structure and the second structure to which is being travelled. The synchronizing device 22 couples the motion of first driving mechanism 6 to the motion of the second driving mechanism 8, as indicated by dashed lines 22a, 22b in Figure 1. This coupling can be embodied to operate electrically (for example, by an appropriate control of the first and second driving mechanisms 6, 8), hydraulically (for example, by a hydraulic system in a coupling of the first and second driving mechanisms 6, 8) and/or mechanically (for example, by a mechanical system in a coupling of the first and second driving mechanisms 6. 8).
In an actual embodiment, the marine transfer platform 2 may comprise a cabin 24 for accommodating the at least one person 5 or goods. The cabin 24 may be partially a partially open cabin, or an essentially closed cabin. An advantage of a partially open, or semi open, cabin is that it is easier to escape from the cabin in case of danger.
Figures 2 to 8 illustrate stages of operation of the marine transfer platform 2 in a transfer of the marine transfer platform 2 according to Figure 1 from a first structure 41 to a second structure 42.
Figure 2 is a schematic view of a first operational stage of a transfer of the marine transfer platform 2 according to Figure 1 from the first structure 41 to the second structure 42.
In a first operational stage, the marine transfer platform 2 is located on the first structure 41. The first structure 41 comprises a stationary platform 44, for example fixed to a sea bed through a support structure 45, and comprises a crane 46 having a hook 48. In a body of water 50 in which waves exist, a vessel or ship embodying the second structure 42 floats. The second structure 42 is subjected to the action of the waves, and therefore may move in different directions, predominantly upward and downward, but also sideward, and in rolling, pitching and yawing motions.
In a second operational stage of the transfer of the marine transfer platform 2 from the first structure 41 to the second structure 42, as illustrated in Figure 3, when the people and/or goods have been loaded on the marine transfer platform 2, the hook 48 of the crane
-11 46 is lowered, and connected to the first connecting member 18 of the marine transfer platform 2. The second structure 42 is positioned such that a landing platform or landing structure thereof is located with the reach of the crane 46.
In a third operational stage of the transfer of the marine transfer platform 2 from the first structure 41 to the second structure 42, as illustrated in Figure 4, the marine transfer platform 2 has been lifted by the crane 46, and an arm of the crane 46 has been tilted to position the marine transfer platform 2 above a landing platform or landing structure of the second structure 42.
In a fourth operational stage of the transfer of the marine transfer platform 2 from the first structure 41 to the second structure 42, as illustrated in Figure 5, while maintaining the suspension of the marine transfer platform 2 in the crane 46 above a landing platform or landing structure of the second structure 42, the second wire 16 is reeled off by controlling the second driving mechanism 8. Thus, the second connecting member 20 is lowered to the second structure 42 in the direction of arrow 60. As indicated by crossed double arrows 62, meanwhile the second structure 42 may move in multiple directions, in particular up and down, under the influence of the waves of the body of water 50.
In a fifth operational stage of the transfer of the marine transfer platform 2 from the first structure 41 to the second structure 42, as illustrated in Figure 6, while maintaining the suspension of the marine transfer platform 2 in the crane 46 above a landing platform or landing structure of the second structure 42, the second connecting member 20 has been connected to the second structure 42. At this point, a direct connection exists between the second structure 42 and the marine transfer platform 2 through the second wire 16, and between the marine transfer platform 2 and the hook 48 of the crane 46 through the first wire 14. The second wire 16 is kept under tension by the second driving mechanism 8, and the length of the second wire 16 between the bottom of the marine transfer platform 2 and the second connecting member 20 varies as a result of movements of the second structure 42, as indicated by double arrow 64. Now, preparations have been made to perform the transfer of the marine transfer platform 2 to the second structure 42.
Figure 7 schematically indicates a sixth operational stage 70, a seventh operational stage 72 and an eighth operational stage 74 of the transfer of the marine transfer platform 2 from the first structure 41 to the second structure 42, wherein the marine transfer platform 2 is lowered from the sixth operational stage 70 to the seventh operational stage 72 and further to the eighth operational stage 74.
For the second structure 42, an associated graph 76 indicates an upward and downward movement in time. For the sixth, seventh and eighth operational stages, similar associated graphs 71, 73 and 75, respectively, indicated an upward and downward movement in time, which is superposed on a downward movement of the marine transfer
- 12 platform 2 induced by reeling off the first wire 14 by the first driving mechanism 6. As can be understood from the graphs 71, 73 and 75, the motion of the marine transfer platform 2 is gradually transformed by the synchronizing device 22 to adapt from the motion of the first structure 41 from which is being travelled to the motion of the second structure 42 to which is being travelled: the graph 75 in the eighth operational stage 74, when the marine transfer platform has landed on the second structure 42, equals the graph 76. Accordingly, the landing action can be smooth and creating relatively low impact, or no impact whatsoever.
During the lowering of the marine transfer platform 2, the second wire 16, through contact with the second guiding sheave 12, guides the marine transfer platform 2, and prevents excessive sideward (lateral) movements in and around the seventh operational stage 72, as illustrated in Figure 8, due to the second connecting member 20 being fixed to the second structure 42, with the second wire 16 being tensioned by the second driving mechanism 8.
Above, the transfer of the marine transfer platform 2 from the first structure 41 to the second structure 42 has been explained by means of a sequence from first to eighth operational stage, referring to Figures 1 to 7. For a transfer of the marine transfer platform 2 from the second structure 42 to the first structure 41, the sequence basically is reversed.
In the fifth, sixth, seventh and eighth operational stages, when the second connecting member 20 has been fixed to the second structure 22, a distance measuring device 80 (Figure 1), e.g. mounted to the second driving mechanism 8 is used for measuring a length of the second wire 16 being representative of the distance between the marine transfer platform 2 and the second structure 42. The synchronizing device 22 is configured to operate based on a distance measuring signal 82 provided by the distance measuring device 80, as shown in Figure 9.
Alternatively, or additionally, the distance measuring device is an ultrasonic or laser distance measuring device 80a, as illustrated in Figure 9, for measuring a distance between the marine transfer platform and an opposite surface of the second structure 42.
The ultrasonic or laser distance measuring device 80a may further function to determine a length of the second wire 16 for the second connecting member 20 to reach the second structure in the third and fourth operational stages.
Figure 10 is an isometric view of a further embodiment of the marine transfer platform. In this embodiment, the first driving mechanism comprises a first winch 6a and a second winch 6b for reeling off and reeling in wires 14a, 14b over guiding sheaves 10a, 10b, respectively, to a first connecting member. The wires 14a, 14b may be part of one wire 14 running over a sheave being part of the first connecting member, wherein the first and second winches 6a, 6b may be rotating in the same or in opposite directions. Alternatively, free ends of the wires 14a, 14b may be connected to the first connecting member, whereby
- 13the first and second winches 6a, 6b operate in parallel and are configured to rotate in the same direction.
The marine transfer platform comprises reels 92 for reeling off and reeling in electric cables 90a, 90b to power an electromagnet 26 of the second connecting member 20, and to provide measuring, control and/or actuation signals for components of the second connecting member 20, such as the electromagnet 26, and an actuator 32 (Figure 1).
The marine transfer platform 2 according to Figure 10 further comprises a synchronizing device (not shown) for mutually adjusting the reeling in and reeling off of the first wires 14a, 14b and second wire 16 such that during travel of the marine transfer platform 2 between the first structure 41 and the second structure 42 the motion of the marine transfer platform 2 is gradually transformed to adapt from the motion of one of the first structure 41 and the second structure 42 from which is being travelled to the motion of the other one of the first structure 41 and the second structure 42 to which is being travelled. The marine transfer platform 2 can be used in all operational stages previously described for marine transfer platform 2 with reference to Figures 1 to 9.
Figure 11 is a schematic view of a further embodiment of a marine transfer platform 2a according to the invention. The marine transfer platform 2a is depicted in the eighth operative stage thereof (comparable with operative stage 74 as depicted in Figure 7). The second connecting member 20a of the marine transfer platform 2a comprises a third guiding sheave 20c, wherein the second wire 16 is running over the third guiding sheave 2c and has its free end connected to the first connecting member 18. Alternatively, the free end of the second wire 16 may be connected to the frame 4 of the marine transfer platform 2a. The third guiding sheave 2c is rotatably connected to an electromagnet 20b of the second connecting member 20a.
The marine transfer platform 2a according to Figure 11 further comprises a synchronizing device (not shown) for mutually adjusting the reeling in and reeling off of the first wire 14 and second wire 16 such that during travel of the marine transfer platform 2a between the first structure 41 and the second structure 42 the motion of the marine transfer platform 2a is gradually transformed to adapt from the motion of one of the first structure 41 and the second structure 42 from which is being travelled to the motion of the other one of the first structure 41 and the second structure 42 to which is being travelled. The marine transfer platform 2a can be used in all operational stages previously described for marine transfer platform 2 with reference to Figures 1 to 9.
As explained in detail above, a marine transfer platform for the substantially vertical transfer of persons or goods between a first structure and a second floating structure is provided. The marine transfer platform comprises a first driving mechanism reeling in and
- 14reeling off a first wire, a first connecting member connecting the first wire to the first structure, a second driving mechanism reeling in and reeling off a second wire, a second connecting member connecting the second wire to the second structure, and a synchronizing device for mutually adjusting the reeling in and reeling off of the first and second wires. During travel of the platform between the first and second structure the motion of the platform is gradually transformed to adapt from the motion of one of the first structure and the second structure from which is being travelled to the motion of the other one of the first structure and the second structure to which is being travelled.
As required, detailed embodiments of the present invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which can be embodied in various forms. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in any appropriately detailed structure. Further, the terms and phrases used herein are not intended to be limiting, but rather, to provide an understandable description of the invention.
The terms a/an, as used herein, are defined as one or more than one. The term plurality, as used herein, is defined as two or more than two. The term another, as used herein, is defined as at least a second or more. The terms including and/or having, as used herein, are defined as comprising (i.e., open language, not excluding other elements or steps). Any reference signs in the claims should not be construed as limiting the scope of the claims or the invention.
The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
Claims (24)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2018789A NL2018789B1 (en) | 2017-04-26 | 2017-04-26 | Marine transfer platform, and method for vertical transfer of at least one person or goods using the marine transfer platform. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2018789A NL2018789B1 (en) | 2017-04-26 | 2017-04-26 | Marine transfer platform, and method for vertical transfer of at least one person or goods using the marine transfer platform. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL2018789B1 true NL2018789B1 (en) | 2018-11-05 |
Family
ID=59295262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL2018789A NL2018789B1 (en) | 2017-04-26 | 2017-04-26 | Marine transfer platform, and method for vertical transfer of at least one person or goods using the marine transfer platform. |
Country Status (1)
| Country | Link |
|---|---|
| NL (1) | NL2018789B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210254601A1 (en) * | 2020-02-19 | 2021-08-19 | Siemens Gamesa Renewable Energy A/S | System and method for assembling or disassembling of a wind turbine |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2998148A (en) * | 1959-02-02 | 1961-08-29 | Jr Edmond E Himel | Sea transfer device |
| FR2493290A1 (en) * | 1980-11-05 | 1982-05-07 | Bretagne Atel Chantiers | Equipment for personnel transport by crane - by cabin between oil rig and ship with electrical control against wave movement |
| EP0053770A2 (en) * | 1980-12-08 | 1982-06-16 | The Boeing Company | Transfer system for use between platforms having relative motion between one another |
| EP0104983A1 (en) * | 1982-09-07 | 1984-04-04 | Alsthom | Basket |
| EP0194175A1 (en) * | 1985-02-15 | 1986-09-10 | Xavier Peyre | Vertically and horizontally transferable ship |
| WO2015044898A1 (en) * | 2013-09-27 | 2015-04-02 | Rolls-Royce Canada, Ltd. | Two body motion compensation system for marine applications |
-
2017
- 2017-04-26 NL NL2018789A patent/NL2018789B1/en not_active IP Right Cessation
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2998148A (en) * | 1959-02-02 | 1961-08-29 | Jr Edmond E Himel | Sea transfer device |
| FR2493290A1 (en) * | 1980-11-05 | 1982-05-07 | Bretagne Atel Chantiers | Equipment for personnel transport by crane - by cabin between oil rig and ship with electrical control against wave movement |
| EP0053770A2 (en) * | 1980-12-08 | 1982-06-16 | The Boeing Company | Transfer system for use between platforms having relative motion between one another |
| EP0104983A1 (en) * | 1982-09-07 | 1984-04-04 | Alsthom | Basket |
| EP0194175A1 (en) * | 1985-02-15 | 1986-09-10 | Xavier Peyre | Vertically and horizontally transferable ship |
| WO2015044898A1 (en) * | 2013-09-27 | 2015-04-02 | Rolls-Royce Canada, Ltd. | Two body motion compensation system for marine applications |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210254601A1 (en) * | 2020-02-19 | 2021-08-19 | Siemens Gamesa Renewable Energy A/S | System and method for assembling or disassembling of a wind turbine |
| US12345230B2 (en) * | 2020-02-19 | 2025-07-01 | Siemens Gamesa Renewable Energy A/S | System and method for assembling or disassembling of a wind turbine |
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| MM | Lapsed because of non-payment of the annual fee |
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