SK163495A3 - Method and apparatus for the transportation of concrete and the like material in pipelines - Google Patents

Abstract

A method and an apparatus for the transportation of shotcrete and pumped concrete mix of stiff plastic consistency (12) in pipelines (I, II, IV) comprises the injection of a fluid through perforations (10) provided in the pipe (1) surrounding the shotcrete or pumped concrete mix (12) to be transported. The fluid may be compressed air, foam or liquid. Thereby friction between the transported mass and the inside of the pipeline is substantially reduced. The fluid may be guided through the perforations (10) through a mid-pipe-wall space (2) between an outer pipe (4) and an inner pipe (1) or a tube or a system of connected cavities (2A) with perforations (10) spirally implanted in a single-wall pipeline (1 and 4). The pipeline can abruptly rotate for 180 degrees clockwise and conterclockwise with stopping and pausing between turnarounds, providing reduced adhesion and better homogeneity of the mix passing through the pipeline.

Description

Field of the invention

The invention relates to a method and apparatus for conveying concrete mixes and similar materials in a pipeline.

BACKGROUND OF THE INVENTION

JP-A-59227622 discloses a device for conveying highly viscous liquids or bulk materials by introducing a gas-saturated fluid through small openings of 0.01 to 20 µm inside a pipe surrounding these conveying materials. The conveying pipe is a filter pipe having a plurality of small openings with a total area of 37 ... 40% of the pipe wall. However, such a device may be completely unsatisfactory for conveying the sprayed and injected concrete mixture, since the small gas-saturated fluid inlets may be clogged with solidified mixture particles, the weakened pipe wall may suddenly be damaged by wear and the transport system may be due to a small pressure difference and the outer wall of the perforated pipe unreliable.

During the conveying of the sprayed and blown concrete mixture through the bent outlet pipe and the flexible pipe, the problem of the high frictional resistance of the conveyed adhesive mixture arises. Moreover, it is very difficult to transport these solidifying plastic consistency mixtures over long distances. Even at small transport distances, the energy consumption for such transport is disproportionately high.

In addition, in particular, the shotcrete mixture is neither homogeneous nor even in the pipe cross-section due to gravity, evenly conveyed. This makes transporting such a mixture over long distances even more problematic.

and

SUMMARY OF THE INVENTION

In order to overcome and overcome the above-mentioned problems and drawbacks, the present invention provides a method and at the same time a device which allows the sprayed and blown concrete mixture of solidifying plastic consistency to be transported over long distances. The result of the proposed arrangement is to reduce the consumption of the supplied energy during the transport of such a mixture. In addition, the components of the mixed mixture can be distributed uniformly over the entire cross-section of the conduit, especially at the point when the mixture leaves the conduit after transport.

The object proposed according to the present invention is achieved by the characteristic technical features set forth in the appended claims.

The method of the present invention is characterized by injecting a fluid through the punching arranged in a pipe that surrounds the conveyed shot or blown concrete mixture. The injected liquid allows lubrication of the mixed concrete mixture inside the pipe in which the conveying of the sprayed and blown concrete mixture of solidifying plastic consistency is performed, thereby substantially reducing the energy consumption. Compressed air, foam or liquid are injected through punctures or small openings densely evenly distributed over the conveyor line.

Thorough mixing of the components of the mixture ensures that the pipe rotates about its longitudinal axis in a 180 ° clockwise and counterclockwise direction with stops and delays of the wet or dry mixture that moves from the bottom wall of the pipe to its top wall as it rotates. Thus, the components of the mixture are evenly distributed throughout the cross-section of the pipe.

The pipe surrounding the conveyed sprayed or injected concrete mixture is perforated and surrounded by an outer pipe and a partition, which partition is in communication with the inlet ends of the piercing and at the same time with a source of pressure for injecting compressed air or liquid. The partition wall is closed at its ends by a flexible seal and a connecting hose with a valve for regulating the pressure in the partition wall is connected to the outer pipe. According to one embodiment, the punctures on the inner pipe are punctured without removing the mass of the pipe. According to another embodiment, the perforations are small holes that can be drilled or formed with removal of the pipe wall material.

The heat-resistant fiber or fiber grains on the outer surfaces of the ends of the inner conduit and on the inner surfaces of the ends of the outer conduit may be made in such a way that one part of the fiber or fiber grains is implanted into the rubber mass and the other part is bound together in a sealing space defined by means of a sealing washer and filled with elastic adhesive resin or molten rubber mass. The ends of the inner pipe may have a weakening on the inner wall on which the inner rings are mounted, fixed to the outer rings, having clamping sleeves airtightly pressed onto the outer pipe around the inner pipe through the inner rings.

Another embodiment of the device according to the present invention is a single-walled pipe having a tube or interconnected cavity system with holes interconnecting the tube or interconnected cavity system to the interior of the conduit in the space of its single wall embedded in the helix. The tube or system of interconnected cavities has an external connection to a pressure source for fluid injection.

According to another embodiment of the device according to the present invention, the pipe system is coupled to a rotary mechanism to rotate the pipe about its longitudinal axis in a direction and counterclockwise by 180 °.

Advantageously, a rotating ring of the gear bearing is fastened to the central part of the pipe, through which the toothed entrainment mechanism converts the mechanical work of the drive mechanism to intermittently rotate the pipe with stops and delays. The rotary mechanism with the fixed bearing ring is mounted on the upper adjustable part of the frame, which can be raised and lowered with respect to the lower stable part of the frame of the movable pulleys.

BRIEF DESCRIPTION OF THE DRAWINGS

Further characteristic features and details of the present invention will be elucidated in the following description of particular embodiments of the device according to the present invention in accordance with the accompanying drawings, in which:

Fig. 1 is a schematic cross-section of a device according to one of the preferred embodiments of the present invention.

Fig. 2 is a partial longitudinal section through a double-walled pipe.

Fig. 3 is a further cross-section of the assembled and sealed double-wall pipe.

Fig. 4 is a cross-sectional view of a single-wall duct according to another embodiment of the present invention; and

Fig. 5 is a schematic view of the movement mechanism of the device according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION

In FIG. 1 is a schematic cross-sectional view of an apparatus for carrying out the present invention with a hopper 11 for storing the concrete mixture to be conveyed to a remote location. The rotary drum 12 is filled with concrete mixture and another rotary drum 13 discharges the concrete mixture into the duct. The connecting pipe 14 introduces compressed air, which is a moving medium and moves the concrete mixture through the pipe. The wet concrete mixture passes through a bent outlet pipe comprising an inner wall 15 and an outer wall 16. The bent double wall outlet pipe I is provided with an end joint 17. The wet mixture passes through a flexible double wall pipe χΐ, an injection nozzle III to inject the accelerant additive ( if necessary) and finally through a flexible double-walled pipe IV.

When conveying the dry shotcrete mixture, the flexible double-walled IV pipe (Fig. 2) is then connected (sometimes before and after) to the nozzle for injecting the accelerating additive of water and liquid.

The bent outlet pipe (Fig. 3), the interconnecting device and the conveying pipe can be designed as double-walled. Compressed air is injected through a plurality of small openings 10 and distributed through the inner wall 15 of the tube. The valve 6 regulates the fluid pressure flowing through the connecting line 18 connected to the external line. The bent outlet pipe may be detachably provided for cleaning small holes.

The flexible double-walled pipe (Fig. 3) consists of a flexible inner pipe 1 provided with reinforcements 31 and an outer pipe 4. The partition wall 2 is closed at the pipe ends by a flexible seal χ. The flexible inner pipe 1 has punctures 10 densely evenly distributed over the wall surface and arranged perpendicular or oblique to the direction of passage of the conveyed mixture. The outer conduit 4 is airtight at the working pressure. The compressed air or lubricating fluid passes through the connecting duct 5 into the partition wall 2. Via the valve 6 in position A or B (Fig. 3), the compressed air is introduced into either the space 2 or from the space 2 to the lower pressure space. The pressures and time intervals between valve positions A and B are controlled automatically. Fatty products are separated by a filter 7.

Lubricating fluid (for example, a plasticizer or an aeration additive) is injected into the bulkhead via the injection nozzle and the connecting line 5.

The outer wall of the flexible inner conduit 1 and the inner wall of the flexible outer conduit 4 are adapted at their sealed ends to receive the flexible seal. One part of the heat-resistant fiber or fiber grains 32 is implanted in the rubber mass, while the formation of the other part is ensured either during assembly of the pipe (Fig. 3 - right) or carried out later by the molten rubber surface. Before sealing the double-wall pipe, a sealing washer 3A is inserted into the partition wall and this space is clamped by clamping sleeves. Thereafter, the duct is mounted upright to pour the elastic adhesive resin or molten rubber mass into the sealing space 3 and is left in this position until the mass solidifies. Heat-resistant fiber or bounded fiber grains 32 at the ends of the duct walls provide a stronger connection and a higher tensile strength of the gasket 2. The duct ends are protected from large deformations by inner rings 30 and outer rings 8.

With the pipe assembly (Fig. 3 - left), the inner pipe wall is weakened at its ends. At these weakened ends an inner ring 30 of the same inner diameter as the pipe is mounted. The outer ring 8 is mounted on the inner ring 30. The flexible outer pipe 4 is air-tightly pressed onto the inner pipe 1 via the inner ring 30 by clamping sleeves 29.

The rigid outer rings 8 have reinforced ends for connecting the adjacent pipe by means of clamps. These rings are fastened to the flexible pipes 4 and 1 by means of screws 9.

According to a further embodiment of the device according to the present invention (Fig. 4), a single-walled conduit 4 is provided with a tube or system of interconnected cavities 2A embedded in a helix. This tube or system of interconnected cavities 2A is connected to a pressure source (not shown) to supply fluid under pressure. The punctures 10 connect the pipe or cavities 2A to the inner space of the single-wall pipes 1 and 4 in order to reduce the friction between the advancing concrete mix and the inner wall. The single-wall pipe 1 and 4 is provided with reinforcements 31.

The pipe may be mounted on rollers 33 (FIG. 5). A rotatable bearing ring 35 mounted on a duct is mounted on a fixed bearing ring 34. The gear 36 on the rotatable bearing ring 35 is paired with a toothed drive mechanism to move the drive mechanism to rotate the pipe in a 180 ° counterclockwise direction. °. The drive mechanism is set up and mounted on the upper adjustable part of the frame 38, which can be raised and lowered with respect to the lower stable part of the frame 39. The rollers 33 can move through the conduit depending on the change in position of the concrete mix being conveyed.

During rotation, the wet mixture and the lubricant change the position from the bottom to the top of the pipe in a disorderly manner (Fig. 5).

When injecting compressed air or liquid into the interior of a flexible duct in thin beams passing through densely equally spaced punctures 10 on its inner wall, the air or liquid beams adapt to the direction of movement due to the pressure of the conveyed mixture. In this way, the adhesive mixture is separated from the pipe wall. The fluid rays are further separated into small air or foam bubbles, thereby homogenizing the mass of the conveyed mixture. The aerated mixture leaves the pipeline either by striking at a high speed on the bearing surface in the case of sprayed concrete or by calm regular flow into the required space in the case of injected concrete. Fluctuating intermittent pressure changes in the space 2 or the space of the pipe or cavities 2A from maximum (valve in position A) to minimum (valve in position B) cause variations in the diameter of the flexible pipe and cause separation of the adhesive transport mixture from the inner wall of the pipe.

The intermittent rotation of the pipe around its axis in a clockwise and anti-clockwise direction by 180 ° with dwells causes the conveyed mixture advancing along the bottom of the pipe cross section (Fig. 5, position A) to change its position from the bottom of the pipe cross section to the top section duct (Fig. 5, position B) and subsequently falls due to gravity through the central part of the duct cross-section through the air flow so that the mixture is uniformly homogenized and accelerated with an equal amount of compressed air.

The preferred embodiments of the present invention described above do not limit the making of any further modifications to the person skilled in the art if any such modification is intended to be within the scope of the present invention as set forth in the appended claims.

Claims (10)

PATENT CLAIMS A method of conveying highly viscous liquids or bulk materials by introducing a gas-saturated fluid through openings arranged in a duct surrounding the conveyed materials, characterized by conveying a concrete mixture or similar materials by injecting compressed air or an aeration additive through punctures arranged in a flexible duct surrounding the air conveyed material. Method according to claim 1, characterized in that, in the dry mixing procedure, after the passage through the bent outlet pipe (I), the pipe (II) and the injection nozzle (III), the sprayed concrete mixture proceeds through the pipe (IV) with punctures. Method according to claim 1, characterized in that, in the wet mixing procedure, the shotcrete mixture after passing through the bent outflow conduit (i) passes further through the perforated conduit (II) and after passing through the injection nozzle (III) to inject the accelerant additive. this is necessary, proceeding through the pipe (IV) with punctures. Method according to any one of the preceding claims, characterized in that the pipe surrounding the concrete mixture and the like is rotated in a direction and counter-clockwise by 180 degrees about its longitudinal axis. Apparatus for conveying highly viscous liquids or bulk materials through openings piping (1), the outer ends of these openings being connected to a pressurized gas source characterized by a flexible piping (1) provided with punctures (10) that surround the conveyed concrete mixture and similar materials. Device according to claim 5, characterized in that the flexible pipe has a hole (10) which is formed without removing its mass. Apparatus according to claims 5 and 6, characterized in that it comprises a resilient seal (3) comprising heat-resistant fiber or fiber grains (32) at the ends of the outer surfaces of the inner pipe (1) and at the ends of the inner surfaces of the outer pipe (4). in such a way that one part of the fiber or fiber grains (32) is implanted in the rubber mass and the other part is bound together in a sealing space (3) defined by the sealing washer (3A) and filled with elastic adhesive resin or molten rubber mass . Device according to claims 5 and 6, characterized in that the ends of the inner pipe have a weakening on the inner wall, on which the inner rings (30) are mounted, fixed to the outer rings (8), having clamping sleeves (29) pressed tightly onto the outer a pipe (4) around the inner pipe (1) through the inner rings (30). Apparatus according to claims 5 and 6, characterized in that the pipe surrounding the sprayed or blown concrete mixture is a single-walled pipe (1 and 4) having a tube or a system of interconnected cavities (2A) inside its wall provided a bore (10) connecting the inserted tube or cavity (2A) to the interior of the conduit (1 and 4), the tube or cavity (2A) being connected to a pressure source to inject fluid into the interior. Apparatus according to any one of claims 5 to 9, characterized in that a pivot bearing (35) supporting the gear (36) is fastened to the central part of the duct by means of which the toothed drive mechanism (37) converts the mechanical work of the drive mechanism into intermittent rotating the pipe with stops and delays, the rotary mechanism with the fixed ring of the bearing (34) being positioned on the upper adjustable part of the frame (38) so that it can be raised and lowered with respect to the lower stable part of the movable roller frame (33).