Concrete pumping equipment

Abstract

To provide a concrete pumping device capable of feeding a concrete material to a pipe by alternately smoothly connecting a connection pipe in a hopper to two pumps, even when a coarse aggregate in a concrete material is large.SOLUTION: A concrete pumping device 1 comprises a pipe 20 extending from a hopper 10 to the outside, and two pumps 30A, 30B having a cylinder 31 opening to the inner surface of the hopper 10. The concrete pumping device 1 also comprises a connection pipe 40 whose front end is connected to the pipe 20, and a switching device 50 that alternately connects the rear end part of the connection pipe 40 to the end parts of the cylinders 31, 31. A sheet 70 that is a plate-like elastic body is arranged on the inner surface of the hopper 10 below a moving area A of the connection pipe 40.SELECTED DRAWING: Figure 3

Description

[Technical field]

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

[0002] One type of concrete pumping device includes a pipe 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 pipe (see, for example, Patent Document 1). In the above-mentioned concrete pumping device, 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 conventional concrete pumping device described above, when the connecting pipe is moved in the hopper to switch the cylinder that is connected to the connecting pipe, the coarse aggregate of the concrete material may get caught between the inner surface of the hopper and the connecting pipe. If the coarse aggregate gets tightly stuck between the inner surface of the hopper and the connecting pipe, the movement of the connecting pipe is hindered, and the concrete material cannot be pumped into the piping. In particular, low-slump concrete materials used at construction sites such as dams have a problem in that the maximum dimensions of the coarse aggregate are large, and the coarse aggregate easily becomes stuck between the inner surface of the hopper and the connecting pipe. The present invention has an object to solve the above-mentioned problems and to provide a concrete pumping device which can smoothly connect the connecting pipes in the hopper to two pumps alternately, and can sequentially pump the concrete material from both pumps into the piping, even when the coarse aggregate of the concrete material is large. [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, and two pumps each having a cylinder opening on the inner surface of the hopper. The concrete pumping device also comprises a connecting pipe disposed in the hopper and having a front end connected to the pipe, and a switching device which moves the connecting pipe to alternately connect the rear end of the connecting pipe to the ends of 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 sheet, which is a plate-shaped elastic body, is disposed on the inner surface of the hopper below the moving area of ​​the connecting pipe. A gap is formed between the inner surface of the hopper and the outer surface of the sheet. In this configuration, even if coarse aggregate of the concrete material gets between the inner surface of the hopper and the connecting pipe, the coarse aggregate is pressed against the inner surface of the flexible sheet, which prevents the coarse aggregate from being firmly stuck between the inner surface of the hopper and the connecting pipe, and the coarse aggregate is pushed by the connecting pipe and pushed out from between the inner surface of the hopper and the connecting pipe. In addition, when coarse aggregate gets between the inner surface of the hopper and the connecting pipe, the sheet bends and the gap between the connecting pipe and the inner surface of the sheet becomes larger, thereby preventing the coarse aggregate from becoming firmly stuck between the inner surface of the hopper and the connecting pipe.

[0006] In the concrete pumping device, a rotating shaft extending in the front-rear direction is provided in the switching device, and the connecting pipe is swung around the axis of the rotating shaft to alternately connect the connecting pipe to both cylinders. In this configuration, it is preferable that the sheet is curved in an arc shape along the swing trajectory of the connecting pipe. In this way, when the connecting pipe is swung, the coarse aggregate pushed by the connecting pipe moves smoothly along the arc-shaped first gap, so that the coarse aggregate can be reliably pushed out from between the inner surface of the hopper and the connecting pipe.

[0008] In the above-mentioned concrete pumping device, by setting the thickness from the inner surface of the hopper to the inner surface of the sheet to be equal to or less than the maximum dimension of the coarse aggregate contained in the concrete material, it is possible to prevent coarse aggregate of the maximum dimension from getting between the inner surface of the hopper and the connecting pipe. It is preferable to set the thickness from the inner surface of the hopper to the inner surface of the sheet to be less than the maximum diameter of the coarse aggregate. However, when adjusting the tension or tautness of the sheet to set the force with which the sheet pushes back the coarse aggregate, the thickness from the inner surface of the hopper to the inner surface of the sheet can be set to be greater than the maximum dimension of the coarse aggregate by appropriately adjusting the gap between the inner surface of the hopper and the outer surface of the sheet and the thickness of the sheet so that the coarse aggregate does not get stuck between the inner surface of the hopper and the connecting pipe. In addition, even if small coarse aggregate that is less than the maximum dimension of the coarse aggregate gets into the gap between the inner surface of the hopper and the connecting pipe, it is difficult for the small coarse aggregate to fit firmly between the inner surface of the hopper and the connecting pipe, so the small coarse aggregate is pushed by the connecting pipe and extruded out from between the inner surface of the hopper and the connecting pipe. Effect of the Invention

[0009] In the concrete pumping device of the present invention, the coarse aggregate that gets between the inner surface of the hopper and the connecting pipe is pressed against the flexible sheet, so that the coarse aggregate can be prevented from getting stuck between the inner surface of the hopper and the connecting pipe. As a result, even when the coarse aggregate of the concrete material is large, the concrete pumping device of the present invention can smoothly connect the connecting pipes in the hopper to the two pumps alternately, and the concrete material can be fed from both pumps to the piping in sequence, thereby improving pouring efficiency. [Brief description of the drawings]

[0010] [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. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] 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 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.

[0012] 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 bottom plate 11, and is open at the top. Concrete material (not shown) is poured into hopper 10. Hopper 10 is also provided with agitating blades (not shown) for agitating 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. As shown in FIG. 3, the bottom surface 13 of the hopper 10 is formed with left and right inclined surfaces 14, 14 that are inclined downward from the left and right side edges toward the middle portion in the left-right direction. In addition, a curved surface 15 that is curved in an arc shape so as to protrude downward is formed in the left-right intermediate portion of the bottom surface 13 of the hopper 10. Protrusions 15a, 15a protrude from the left and right edges of the curved surface 15, respectively.

[0013] As shown in FIG. 1, a connecting hole 16 penetrates the front wall 12 of the hopper 10, and a first switching hole 17 and a second switching hole 18 penetrate the rear wall 12. The connecting hole 16 is formed in the left-right center of the front wall portion 12. The first switching hole 17 and the second switching hole 18 are formed symmetrically on either side of the left-right center of the rear wall portion 12. The first switching hole 17 is located on the left side, and the second switching hole 18 is located on the right side.

[0014] 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.

[0015] 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 first switching hole 17 of the hopper 10. As a result, the cylinder 31 opens to the inner surface of the hopper 10 through the first 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 similar configuration to the first pump 30A and includes a cylinder 31 and a piston 32. 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 second switching hole 18.

[0016] 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 is connected to 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 is connected to the first switching hole 17. As a result, the rear end of the connecting pipe 40 is in communication with the inside of the cylinder 31 of the first pump 30A via the first 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 is connected to the second switching hole 18. As a result, the rear end of the connecting pipe 40 is in communication with the inside of the cylinder 31 of the second pump 30B via the second switching hole 18.

[0017] The switching device 50 rotates the connecting pipe 40 in the left-right direction as shown in Fig. 3, and includes a rotating shaft 51 extending in the front-rear direction as shown in Fig. 1, 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 left and right (see FIG. 3), the rear end of the connecting pipe 40 can be alternately connected to both the cylinders 31, 31 of the first pump 30A and the second pump 30B. 3, when connecting pipe 40 is swung left and right, the lower surface shape (outer shape of the lower part) of movement area A (swing area) is curved in an arc shape that protrudes downward. In other words, the swing trajectory of the lower end of connecting pipe 40 is curved in an arc shape that protrudes downward. 1, the connecting pipe 40 is curved in an S-shape in plan view, so that the rear part of the movement area A (swing area) when the connecting pipe 40 is swung left and right is lower than the front part. The curved surface 15 of the bottom surface 13 of the hopper 10 is inclined so that the rear part is deeper than the front part in accordance with the movement area A of the connecting pipe 40.

[0018] 3, in the concrete pumping device 1 of this embodiment, a first gap H1 is formed between the curved surface 15 of the hopper 10 and the lower surface of the movement area A of the connecting pipe 40. The first gap H1 is a gap between the curved surface 15 and the outer circumferential surface of the connecting pipe 40 in the radial direction of the rotating shaft 51. The first gap H1 is curved in an arc shape so as to protrude downward in accordance with the shape of the underside of the movement area A of the rear end of the connecting pipe 40. In this embodiment, the curvature of the curved surface 15 is greater than the curvature of the underside of the movement area A of the connecting pipe 40. Therefore, the first gap H1 becomes larger from the center in the left-right direction toward the ends in the left-right direction. A rectangular plate-like sheet 70 is disposed in the first gap H1. The sheet 70 is an elastic body made of resin. The sheet 70 is disposed along the upper surface of the curved surface 15 (the inner surface of the hopper 10) below the movement area A of the connecting pipe 40. The sheet 70 is curved in an arc shape so as to protrude downward along the swing trajectory of the connecting pipe 40. 1, the sheet 70 is overlapped with the rear part of the curved surface 15. In other words, the sheet 70 is provided at a position facing the rear end part of the connecting pipe 40.

[0019] 3, the sheet 70 is supported by left and right protrusions 15a, 15a provided on the curved surface 15, and is disposed at a distance from the curved surface 15. As a result, a second gap H2 is formed between the curved surface 15 and the outer surface (lower surface) of the sheet 70. The second gap H2 is curved in an arc shape so as to protrude downward along the curved surface 15. The thickness T from the curved surface 15 of the hopper 10 to the inner surface of the sheet 70 (the thickness of the sheet 70 + the distance of the second gap H2) is set to be less than the maximum dimension of the coarse aggregate contained in the concrete material (not shown) poured into the hopper 10. It is preferable to set the thickness T from the curved surface 15 of hopper 10 to the inner surface of sheet 70 to be less than the maximum diameter of the coarse aggregate. However, when adjusting the tension or tautness of sheet 70 to set the force with which sheet 70 pushes back the coarse aggregate, the thickness from the curved surface 15 of hopper 10 to the inner surface of sheet 70 can also be set to be greater than the maximum dimension of the coarse aggregate by appropriately adjusting the gap between curved surface 15 of hopper 10 and the outer surface of sheet 70 and the thickness of sheet 70 so as to prevent the coarse aggregate from becoming stuck between the inner surface of hopper 10 and connecting pipe 40.

[0020] 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.

[0021] 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.

[0022] In the concrete pumping device 1 as described above, even if coarse aggregate of the concrete material gets into the gap between the curved surface 15 of the hopper 10 and the connecting pipe 40 shown in FIG. In addition, in the concrete pumping device 1, a second gap H2 is formed between the curved surface 15 of the hopper 10 and the outer surface of the sheet 70. Therefore, when the coarse aggregate is pressed against the sheet 70, the sheet 70 itself is compressed and bends, thereby increasing the gap between the connecting pipe 40 and the inner surface of the sheet 70. In addition, in the concrete pumping device 1, the thickness T from the curved surface 15 of the hopper 10 to the inner surface (top surface) of the sheet 70 is set to be less than the maximum dimension of the coarse aggregate contained in the concrete material, thereby preventing coarse aggregate of the maximum dimension from getting between the inner surface of the hopper 10 and the connecting pipe 40. In addition, even if small coarse aggregate that is less than the maximum dimension of the coarse aggregate enters between the inner surface of the hopper 10 and the connecting pipe 40, it is difficult for the small coarse aggregate to fit firmly between the inner surface of the hopper 10 and the connecting pipe 40, and therefore the small coarse aggregate is pushed by the connecting pipe 40 and extruded from between the inner surface of the hopper 10 and the connecting pipe 40. Even if the sheet 70 is not provided, if the first gap H is made larger than the maximum dimension of the coarse aggregate, the coarse aggregate will be less likely to get caught in the first gap H1, but this will result in an increase in the amount of concrete material remaining below the connecting pipe 40. On the other hand, in the concrete pumping device 1 in which the sheet 70 is provided in the first gap H1, the concrete material can be prevented from remaining. In the concrete pumping device 1 of this embodiment, the coarse aggregate is prevented from becoming firmly stuck between the inner surface of the hopper 10 and the connecting pipe 40, and the coarse aggregate is pushed by the connecting pipe 40 and extruded from between the inner surface of the hopper 10 and the connecting pipe. Since the first gap H1 is curved in an arc shape, when the connecting pipe 40 is oscillated, the coarse aggregate pushed by the connecting pipe 40 moves smoothly along the arc-shaped first gap H1, so that the coarse aggregate can be reliably pushed out from between the inner surface of the hopper 10 and the connecting pipe 40. Therefore, in the concrete pumping device 1 of the present embodiment, even when the coarse aggregate of the concrete material is large, the connecting pipe 40 in the hopper 10 can be smoothly connected alternately to the first pump 30A and the second pump 30B as shown in FIGS. As a result, in the concrete pumping device 1 of the present embodiment, low-slump concrete material can be sequentially pumped from the first pump 30A and the second pump 30B to the piping 20, thereby improving pouring efficiency.

[0023] 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, the first gap H1 is curved in an arc shape as shown in Fig. 3, but the shape is not limited to this. For example, when the connecting pipe 40 moves linearly in the left-right direction, the first gap H1 and the sheet 70 also have a linear shape.

[0024] In the concrete pumping device 1 of this embodiment, a second gap H2 is formed between the curved surface 15 of the hopper 10 and the outer surface of the sheet 70. As a reference example of the present invention,The sheet 70 may be directly laminated onto the curved surface 15 without forming the second gap H2.

[0025] The thickness and material of the sheet 70 are not limited, and are set appropriately taking into consideration the flexibility and durability of the sheet 70 according to the size of the coarse aggregate so that the coarse aggregate does not get stuck between the inner surface of the hopper 10 and the connecting pipe 40. [Explanation of symbols]

[0026] 1. Concrete pumping equipment 10 Hopper 11 Bottom plate 12 Wall 13 Bottom 14 Slope 15 Curved Surfaces 15a Protrusion 16 Connection hole 17 First change hole 18 Second switching hole 20 Piping 30A First Pump 30B Second pump 31 Cylinder 32 Piston 40 Connecting pipe 50 Switching Device 51 Rotating shaft 70 sheets A moving area H1 First gap H2 Second gap

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 portion 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 sheet that is a plate-shaped elastic body is disposed on an inner surface of the hopper below a moving area of ​​the connecting pipe; A concrete pumping device characterized in that a gap is formed between the inner surface of the hopper and the outer surface of the sheet.

2. The concrete pumping device according to claim 1, The switching device is A rotation shaft extending in the front-rear direction is provided, The connecting pipe is swung around the axis of the rotation shaft to alternately connect the connecting pipe to both of the cylinders, A concrete pumping device characterized in that the sheet is curved in an arc shape along the swing trajectory of the connecting pipe.

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