Concrete pumping device

Abstract

To provide a concrete pumping device capable of preventing a cavity from occurring in a concrete material to reliably suction the concrete material into cylinders of both pumps.SOLUTION: A concrete pumping device 1 comprises a hopper 10, a pipe 20 extending from the hopper 10 to the outside, two pumps 30A, 30B each having a cylinder 31 opening to an inner surface of the hopper 10, a connection pipe 40 that is arranged in the hopper 10 and whose front end part is connected to the pipe 20, and a switching device 50 that alternately connects a rear end part of the connection pipe 40 to both cylinders 31, 31. A concrete material in the cylinder 31 is pumped into the pipe 20 through the connection pipe 40. A cavity prevention device 70 is provided in the hopper 10 to apply pressure and vibration to the concrete material.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a concrete pumping device. [Background technology]

[0002] One example of a concrete pumping device is one that includes piping extending from a hopper to the pouring site, two pumps with cylinders opening to the inner surface of the hopper, and a connecting pipe positioned inside the hopper, with one end of the connecting pipe connected to the piping (see, for example, Patent Document 1). In the above-mentioned concrete pumping device, the concrete material in the hopper is sucked into the cylinder, and the other end of the connecting pipe is alternately connected to both cylinders, so that the concrete material in both cylinders is pumped into the piping in sequence. Such a concrete pumping device can be installed in a narrow space and can improve the efficiency of pouring concrete material compared to a case in which a hopper is hoisted by a crane and concrete material is poured. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-49651 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional concrete pumping device, when the connecting pipe is moved through low-slump concrete material, a cavity may be formed in the path where the connecting pipe has passed. If the opening of the cylinder is connected to the cavity, the concrete material cannot be sucked into the cylinder. An object of the present invention is to solve the above-mentioned problems and to provide a concrete pumping device which can prevent cavities from being created in the concrete material due to movement of the connecting pipe, reliably suck the concrete material into the cylinders of both pumps, and sequentially pump the concrete material from both pumps into the piping. [Means for solving the problem]

[0005] In order to solve the above problems, the present invention provides a concrete pumping device, comprising: a hopper into which concrete material is poured, a pipe extending from the hopper to the outside, two pumps each having a cylinder that opens to the inner surface of the hopper, a connecting pipe disposed in the hopper and having a front end connected to the pipe, and a switching device that moves the connecting pipe to alternately connect the rear end of the connecting pipe to both cylinders. The concrete pumping device is configured to pump the concrete material sucked into the cylinder into the pipe through the connecting pipe. A cavity prevention device that applies at least one of pressure and vibration to the concrete material is provided in the hopper.

[0006] In the concrete pumping device of the present invention, the pressure and vibration applied by the cavity prevention device move the concrete material and fill the traces left by the connecting pipe, preventing the formation of cavities in the concrete material. This allows the concrete material to be reliably sucked into the cylinders of both pumps.

[0007] When the cavity prevention device has an expandable / contractable bag, pressure can be applied to the concrete material by expanding the bag. When the cavity prevention device has a vibration device attached to the hopper, vibration can be applied to the concrete material from the vibration device via the hopper. Furthermore, the cavity prevention device may have both a configuration for applying pressure to the concrete material and a configuration for applying vibration to the concrete material.

[0008] In the concrete pumping device, the switching device includes a rotating shaft extending in the front-rear direction, and the connecting pipe is swung left and right around the axis of the rotating shaft to alternately connect the connecting pipe to both cylinders. In this case, it is preferable that the cavity prevention devices are disposed on both the left and right sides of the rotating shaft, and when the connecting pipe moves to the left side with respect to the rotating shaft, the cavity prevention device on the right side is driven, and when the connecting pipe moves to the right side with respect to the rotating shaft, the cavity prevention device on the left side is driven. In this way, by driving the cavity prevention device on the side opposite to the side where the connecting pipe moves relative to the pivot axis (the side where the connecting pipe leaves a trail), it is possible to efficiently prevent cavities from forming in the concrete material.

[0009] In the above-mentioned concrete pumping device, when the cylinder is connected to the inside of the hopper through a switching hole formed in the hopper, it is preferable to form a tapered surface on the inner opening edge of the switching hole whose diameter decreases toward the back side of the cylinder, and to form a tapered surface on the outer circumferential edge of the rear end of the connecting pipe whose diameter decreases toward the rear end side of the connecting pipe. In this configuration, when the connecting pipe is moved to communicate with the switching hole, aggregate is less likely to become caught between the opening edge of the switching hole and the outer circumferential edge of the rear end of the connecting pipe. Effect of the Invention

[0010] In the concrete pumping device of the present invention, by applying pressure and vibration to the concrete material, it is possible to prevent cavities from forming in the concrete material when the connecting pipe moves, so that the concrete material can be reliably sucked into the pump cylinder and pumped into the piping. [Brief description of the drawings]

[0011] [Figure 1] 3 is a plan view showing a state in which a connecting pipe is connected to a first pump in the concrete pumping device according to the embodiment of the present invention. FIG. [Diagram 2]FIG. 2 is a plan view showing a state in which a connecting pipe is connected to a second pump in the concrete pumping device according to the embodiment of the present invention. [Diagram 3] FIG. 3 is a cross-sectional view taken along line III-III of FIG. 1, showing the concrete pumping device according to the embodiment of the present invention. [Figure 4] 4 is a cross-sectional view taken along line IV-IV of FIG. 1, showing the concrete pumping device according to the embodiment of the present invention. [Diagram 5] 4 is a side cross-sectional view showing a state in which a connecting pipe is connected to a switching hole in a concrete pumping device according to an embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this embodiment, a concrete pumping device capable of pumping low-slump concrete material (maximum coarse aggregate size 80 to 150 mm, slump 5 cm or less) used in dam construction to a casting location will be described as an example. FIG. 1 is a plan view showing a state in which a connecting pipe is connected to a first pump in a concrete pumping device according to an embodiment of the present invention. 1, the concrete pumping device 1 of this embodiment includes a hopper 10, a pipe 20 extending from the hopper 10 to the outside, and a first pump 30A and a second pump 30B connected to the hopper 10. The concrete pumping device 1 also includes a connecting pipe 40 disposed within the hopper 10, and a switching device 50 that alternately connects the connecting pipe 40 to the first pump 30A and the second pump 30B.

[0013] The hopper 10 is formed with a rectangular bottom plate 11 and four walls 12 (front, back, left and right) that are raised from the edges of the bottom plate 11, and has an open top. Concrete material (not shown) is poured into the hopper 10. The hopper 10 is provided with an agitation device 60 for agitating the concrete material, and a cavity prevention device 70 for preventing the formation of cavities in the concrete material. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 1, showing the concrete pumping device according to the embodiment of the present invention. 3, left and right inclined surfaces 14, 14 are formed on the bottom surface 13 of the hopper 10, which are inclined downward from the left and right side edges toward the middle part in the left-right direction. In addition, a curved surface 15 is formed in the middle part in the left-right direction of the bottom surface 13 of the hopper 10, which is curved in an arc shape so as to protrude downward.

[0014] As shown in FIG. 1, a connecting hole 16 penetrates the front wall 12 of the hopper 10, and left and right switching holes 17, 17 penetrate the rear wall 12. The connecting hole 16 is formed in the left-right center of the front wall portion 12. The left and right switching holes 17, 17 are formed symmetrically on either side of the left-right center of the rear wall portion 12.

[0015] The piping 20 is a steel pipe extending from the hopper 10 to the outside. One end of the piping 20 is connected to the connecting hole 16 of the hopper 10. As a result, the piping 20 opens to the inner surface of the hopper 10 through the connecting hole 16. The length of the pipe 20 is appropriately set according to the distance from the hopper 10 to the concrete pouring location so that the other end of the pipe 20 reaches the concrete pouring location.

[0016] The first pump 30A includes a cylinder 31 and a piston 32 housed in the cylinder 31. The cylinder 31 is a cylindrical member extending in the front-rear direction. The rear end of the cylinder 31 is closed, and the front end is connected to the switching hole 17 on the left side of the hopper 10. As a result, the cylinder 31 opens to the inner surface of the hopper 10 through the switching hole 17. The piston 32 reciprocates back and forth within the cylinder 31 by a driving device (not shown) such as a hydraulic mechanism. The second pump 30B has a configuration similar to that of the first pump 30A, and includes a cylinder 31 and a piston 32, and the piston 32 can reciprocate within the cylinder 31. The cylinder 31 of the second pump 30B opens to the inner surface of the hopper 10 through the switching hole 17 on the right side.

[0017] The connecting pipe 40 is a cylindrical member extending in the front-rear direction, and is disposed above the curved surface 15 within the hopper 10. The front end of the connecting pipe 40 communicates with the piping 20 through the connecting hole 16. The front end of the connecting pipe 40 is connected to the inner surface of the hopper 10 so as to be rotatable about its axis. The rear end of the connecting pipe 40 is offset in the left-right and up-down directions from the front end. The connecting pipe 40 is curved in an S-shape in a plan view. In the state shown in FIG. 1, the rear end of the connecting pipe 40 communicates with the left switching hole 17. As a result, the rear end of the connecting pipe 40 communicates with the inside of the cylinder 31 of the first pump 30A via the switching hole 17. FIG. 2 is a plan view showing a state in which the connecting pipe is connected to the second pump in the concrete pumping device according to the embodiment of the present invention. 2, when the connecting pipe 40 is rotated left and right about the axis L in the front-rear direction passing through the center of the front end of the connecting pipe 40 from a state in which the rear end of the connecting pipe 40 is connected to the first pump 30A, the rear end of the connecting pipe 40 communicates with the right-side switching hole 17. As a result, the rear end of the connecting pipe 40 communicates with the inside of the cylinder 31 of the second pump 30B via the switching hole 17.

[0018] The switching device 50 rotates the connecting pipe 40 in the left-right direction, and includes a rotating shaft 51 extending in the front-rear direction, and a drive mechanism (not shown) that rotates the rotating shaft 51 about its axis. The rotating shaft 51 protrudes rearward from the center of the front end of the connecting pipe 40, and is disposed above the rear of the connecting pipe 40. The rotating shaft 51 is a linear member whose central axis is an axis L in the front-rear direction that passes through the center of the front end portion of the connecting pipe 40 . By rotating the rotation shaft 51 of the switching device 50 about its axis, the connecting pipe 40 can be swung in the left-right direction with the axis line L as the center of rotation. 1 and 2, by reversing the connecting pipe 40 in the left-right direction, the rear end of the connecting pipe 40 can be alternately switched to communicate with both the cylinders 31, 31 of the first pump 30A and the second pump 30B.

[0019] When pumping concrete material to a pouring site using the concrete pumping device 1 of this embodiment, the concrete material is charged into the hopper 10 shown in Fig. 1, and the piston 32 of the second pump 30B to which the connecting pipe 40 is not connected is moved backward within the cylinder 31. As a result, the concrete material in the hopper 10 is sucked into the cylinder 31 of the second pump 30B. In this state, as shown in FIG. 2, the switching device 50 swings the connecting pipe 40 rightward to connect the rear end of the connecting pipe 40 to the cylinder 31 of the second pump 30B. Then, the piston 32 of the second pump 30B is moved forward within the cylinder 31 to send the concrete material in the cylinder 31 of the second pump 30B into the piping 20 via the connecting pipe 40. Also, the piston 32 of the first pump 30A is moved backward within the cylinder 31 to suck the concrete material in the hopper 10 into the cylinder 31 of the first pump 30A. Next, as shown in FIG. 1, the connecting pipe 40 is swung leftward by the switching device 50 to connect the rear end of the connecting pipe 40 to the cylinder 31 of the first pump 30A. Then, the piston 32 of the first pump 30A is moved forward within the cylinder 31, and the concrete material in the cylinder 31 of the first pump 30A is sent to the piping 20 via the connecting pipe 40. Also, the piston 32 of the second pump 30B is moved backward within the cylinder 31, and the concrete material in the hopper 10 is sucked into the cylinder 31 of the second pump 30B.

[0020] 1 and 2, in the concrete pumping device 1, the rear end of the connecting pipe 40 is alternately connected to both the cylinders 31, 31 of the first pump 30A and the second pump 30B, and the concrete material in both the cylinders 31, 31 is sequentially fed into the piping 20. In this way, the concrete material in the hopper 10 can be poured into the pouring location through the piping 20.

[0021] 1, in the concrete pumping device 1 of this embodiment, an agitator 60 is provided in a hopper 10. The agitator 60 agitates the concrete material charged into the hopper 10. The agitator 60 includes a rotating shaft 61 extending in the left-right direction, and left and right agitating blades 62, 62 attached to the rotating shaft 61. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 1, showing the concrete pumping device according to the embodiment of the present invention. The rotating shaft 61 is disposed at the front inside the hopper 10. Both ends of the rotating shaft 61 are rotatably supported by the left and right wall portions 12, 12 of the hopper 10. The rotating shaft 61 is disposed above the connecting pipe 40, as shown in Fig. 4. The rotating shaft 61 is rotated about its axis by a driving device (not shown) provided on the outer surface of the hopper 10. 1, left and right stirring blades 62, 62 are attached to the rotating shaft 61 with a gap therebetween in the left-right direction. The stirring blades 62, 62 are disposed on both the left and right sides of the rotating shaft 61, sandwiching the center portion in the left-right direction (axial direction). The agitating blade 62 is formed in a spiral shape around the axis of the rotating shaft 61. As shown in Fig. 4, the agitating blade 62 of this embodiment is formed by arranging a plurality of blade plates 62a in a spiral shape. According to the mixing device 60 having such mixing blades 62, it is possible to sufficiently mix low-slump concrete material having a maximum dimension of coarse aggregate of 80 to 150 mm and a slump of 5 cm or less.

[0022] FIG. 5 is a side cross-sectional view showing a state in which the connecting pipe is connected to the switching hole in the concrete pumping device according to the embodiment of the present invention. 5, in the concrete pumping device 1 of this embodiment, a tapered surface 18 that decreases in diameter toward the back of the cylinder is formed on the inner opening edge (the inner side of the hopper 10) of the switching hole 17 that leads to the cylinder 31. Also, a tapered surface 41 that decreases in diameter toward the rear end side of the connecting pipe 40 (the switching hole 17 side) is formed on the outer circumferential edge of the rear end of the connecting pipe 40. In this embodiment, the inner opening edge of the switching hole 17 and the outer circumferential edge of the rear end of the connecting pipe 40 are formed by welding a metal material that is harder than other portions. When the connecting pipe 40 is moved to communicate with the switching hole 17, aggregate may get caught between the opening edge of the switching hole 17 and the outer circumferential edge of the rear end of the connecting pipe 40. Even in such a case, the aggregate moves inward and outward of the switching hole 17 along both tapered surfaces 18, 41, and comes out from between the switching hole 17 and the rear end of the connecting pipe 40. This makes it difficult for aggregate to become caught between the opening edge of the switching hole 17 and the outer peripheral edge of the rear end of the connecting pipe 40 when the connecting pipe 40 is connected to the switching hole 17, and allows for smooth switching of the connection between the connecting pipe 40 and the left and right switching holes 17, 17 (see Figure 3). In this embodiment, the inner opening edge of the switching hole 17 and the outer circumferential edge of the rear end of the connecting pipe 40 are harder than other portions, and therefore are less likely to deform even when struck by aggregate.

[0023] In the concrete pumping device 1 of this embodiment, as shown in Fig. 3, blades 43, 43 are attached to the left and right side surfaces of the rear part of the connecting pipe 40. The blades 43 extend downward from the sides of the connecting pipe 40. The blades 43 can prevent aggregate from getting between the outer surface of the lower part of the connecting pipe 40 and the bottom surface 13 of the hopper 10. This makes it possible to prevent aggregate from getting caught between the outer surface of the connecting pipe 40 and the bottom surface 13 of the hopper 10 when the connecting pipe 40 is moved in the left-right direction, and allows smooth switching between the connection between the connecting pipe 40 and the left and right switching holes 17, 17.

[0024] In the concrete pumping device 1 of this embodiment, as shown in Fig. 1, a plurality of cavity prevention devices 70 are provided in the hopper 10. The cavity prevention devices 70 are devices for preventing cavities from being formed in the wake of the connecting pipe 40 when the connecting pipe 40 is moved through the concrete material charged into the hopper 10. In this embodiment, four cavity prevention devices 70 are provided at the rear of the hopper 10. The four cavity prevention devices 70 are arranged at intervals in the left-right direction. In this embodiment, two cavity prevention devices 70 are provided on each of the left and right sides of the rotation shaft 51. A cavity prevention device 70 is provided on each of the left wall portion 12 and the inclined surface 14, and a cavity prevention device 70 is provided on each of the right wall portion 12 and the inclined surface 14.

[0025] 3, the cavity prevention device 70 includes an expansion / contraction device 71 attached to the inner surface of the hopper 10, and a vibration device 75 attached to the outer surface of the hopper 10. The expansion / contraction device 71 and the vibration device 75 in this embodiment are connected by a shaft portion penetrating the wall portion 12 or the bottom plate 11 of the hopper 10. The expansion / contraction device 71 includes a frame 72 fixed to the inner surface of the hopper 10, and a bag 73 housed in the frame 72. The bag 73 is a stretchable resin bag. A pipe is connected to the bag 73 from a compressor (not shown), and the bag 73 expands when compressed air is sent into the bag 73. When the bag body 73 is expanded, a part of the bag body 73 bulges out from the opening of the frame body 72, and pressure is applied to the concrete material in the hopper 10. Thereafter, the air in the bag body 73 is released through the piping, causing the bag body 73 to contract. In this manner, the expansion / contraction device 71 repeatedly expands and contracts the bag body 73, thereby repeatedly applying pressure to the concrete material. The vibrating device 75 generates vibrations by being driven by a motor. When the vibrating device 75 vibrates, the vibrations are transmitted to the hopper 10, and the concrete material in the hopper 10 is subjected to vibrations.

[0026] In the void prevention device 70 of this embodiment, as shown in Figure 1, when the connecting pipe 40 moves to the left relative to the rotating shaft 51, the two void prevention devices 70, 70 on the right side are driven, the bag body 73 of the expansion / contraction device 71 expands and the vibration device 75 vibrates. Also, as shown in FIG. 2, when the connecting pipe 40 moves to the right with respect to the rotating shaft 51, the two cavity prevention devices 70, 70 on the left side are driven, the bag body 73 of the expansion / contraction device 71 expands, and the vibration device 75 vibrates. In this manner, in this embodiment, the cavity prevention device 70 is configured to operate on the side opposite to the side where the connecting pipe 40 moves relative to the rotation shaft 51. In other words, the cavity prevention device 70 operates on the side where the connecting pipe 40 leaves a trace after it has moved.

[0027] In the concrete pumping device 1 as described above, the pressure and vibration applied by the cavity prevention device 70 shown in Fig. 1 causes the concrete material to move and fills the gap left by the connecting pipe 40, preventing the formation of cavities in the low-slump concrete material. This allows the low-slump concrete material to be reliably sucked into both the cylinders 31, 31 of the first pump 30A and the second pump 30B and fed into the piping 20, improving pouring efficiency. Furthermore, in the concrete pumping device 1 of this embodiment, by driving the cavity prevention device 70 on the side where the connecting pipe 40 moves, it is possible to efficiently prevent cavities from being formed in the concrete material.

[0028] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit of the present invention. In the concrete pumping device 1 of this embodiment, as shown in FIG. 3, the expansion / contraction device 71 and the vibration device 75 of the cavity prevention device 70 are connected, but the expansion / contraction device 71 and the vibration device 75 may be configured separately. In addition, in the concrete pumping device 1 of this embodiment, both the expansion / contraction device 71 and the vibration device 75 are provided as the cavity prevention device 70, but the cavity prevention device 70 may be formed by either the expansion / contraction device 71 or the vibration device 75. Furthermore, the number of cavity prevention devices 70 provided in the hopper 10 is not limited, and is set appropriately depending on the size of the hopper 10, the viscosity of the concrete material, etc. In the concrete pumping device 1 of this embodiment, the cavity prevention device 70 on the right side is driven when the connecting pipe 40 moves to the left, and the cavity prevention device 70 on the left side is driven when the connecting pipe 40 moves to the right, but the cavity prevention device 70 may also be driven constantly. [Explanation of symbols]

[0029] 1. Concrete pumping equipment 10 Hopper 11 Bottom plate 12 Wall 13 Bottom 14 Slope 15 Curved Surfaces 16 Connection hole 17 Switching hole 18 Tapered surface 20 Piping 30A First Pump 30B Second pump 31 Cylinder 32 Piston 40 Connecting pipe 41 Tapered surface 43 Earth removal plate 50 Switching Device 51 Rotating shaft 60 Stirring device 61 Rotational axis 62 Stirring blade 62a wing plate 70 Cavity prevention device 71 Inflation device 72 Frame 73 Bag body 75 Vibration device

Claims

1. A hopper into which concrete materials are poured; A pipe extending from the hopper to the outside; Two pumps each having a cylinder opening to the inner surface of the hopper; a connecting pipe disposed in the hopper and having a front end connected to the piping; a switching device that moves the connecting pipe to alternately connect the rear end of the connecting pipe to both of the cylinders, A concrete pumping device configured to pump the concrete material sucked into the cylinder into the piping through the connecting pipe, A concrete pumping device comprising: a cavity prevention device disposed within the hopper for applying at least one of pressure and vibration to the concrete material.

2. The cavity prevention device has an inflatable and deflatable bag, 2. The concrete pumping device according to claim 1, wherein pressure is applied to the concrete material by expanding the bag.

3. The cavity prevention device includes a vibration device attached to the hopper, 2. The concrete pumping device according to claim 1, wherein the vibration is applied to the concrete material from the vibration device through the hopper.

4. The switching device is A rotation shaft extending in the front-rear direction is provided, The connecting pipe is pivoted left and right about the axis of the rotation shaft to alternately connect the connecting pipe to both of the cylinders, The cavity prevention devices are disposed on both the left and right sides of the rotation axis, When the connecting pipe moves to the left with respect to the pivot shaft, the right-side cavity prevention device is driven, 2. The concrete pumping device according to claim 1, characterized in that, when the connecting pipe moves to the right with respect to the pivot shaft, the left cavity prevention device is driven.

5. The cylinder communicates with the inside of the hopper through a switching hole formed in the hopper, The inner opening edge of the switching hole is formed with a tapered surface that decreases in diameter toward the back side of the cylinder, 2. The concrete pumping device according to claim 1, wherein the connecting pipe has an outer peripheral edge at a rear end thereof formed with a tapered surface that decreases in diameter toward the rear end of the connecting pipe.

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