Concrete pumping pump, concrete pumpability evaluation test device, concrete pumping method, and concrete pumpability evaluation test method

Abstract

To provide a concrete force-feed pump 10 that can achieve space saving.SOLUTION: A concrete force-feed pump 10 includes: a fixed base 20; a rotary plate 30 capable of rotating with respect to the fixed base 20; a drive mechanism 31 capable of rotating the rotary plate 30; a first cylinder 41 and a second cylinder 51 fixed to the rotary plate 30; and a first plunger 42 and a second plunger 52 moving forward and backward. The first cylinder 41 and the second cylinder 51 can connect alternately to a first opening 21 and a second opening 22 by rotating the rotary plate 30 using the drive mechanism 31. By retracting the first plunger 42 in the first cylinder 41 connected to the first opening 21, concrete can be accommodated in the first cylinder 41. By advancing the second plunger 52 in the second cylinder 51 connected to the second opening 22, concrete accommodated in the second cylinder 51 can be discharged.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a concrete pumping pump, a concrete pumpability evaluation test apparatus, a concrete pumping method, and a concrete pumpability evaluation test method.

Background Art

[0002] Conventionally, when constructing various structures such as buildings, slopes, retaining walls, and tunnels, a concrete pump method using a pumping pump to transport concrete to the construction site is known. In the concrete pump method, for example, as described in Patent Document 1, concrete is pumped from a concrete pumping pump mounted on a pump truck through a pressure pipe to a construction site of a building and placed.

[0003] As a concrete pumping pump, for example, as described in Patent Document 2, a pair of plunger pumps are fixed to a sliding plate having two through holes opened, and the sliding plate is reciprocated horizontally with respect to a fixed plate having three through holes opened. Among the three through holes of the fixed plate, hoppers for storing concrete are connected to the two through holes at both ends via suction pipes, and a discharge pipe for sending concrete to the pressure pipe is connected to the central through hole. Then, in the concrete pumping pump, while one plunger sucks concrete from the hopper, the other plunger sends concrete to the discharge pipe, and then, after horizontal movement, while one plunger sends concrete to the discharge pipe, the other plunger sucks concrete from the hopper, and the above steps can be repeated.

[0004] In addition, as a test method for evaluating the pumpability of concrete using a concrete pumping pump, there are guidelines of the Japan Society of Civil Engineers (Non-Patent Document 1). When concrete is driven by long-distance pumping, it is said that an actual piping test in the guidelines is carried out by connecting the pipes actually used and installing a long piping path.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Non-Patent Document

[0006]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, the concrete pumping pump of Patent Document 2 requires a horizontal space for reciprocating a pair of plungers with respect to three through holes arranged horizontally.

[0008] In addition, a full-scale pipe test such as Non-Patent Document 1 in a test method for evaluating the pumpability of concrete can cost several million yen to tens of millions of yen per test due to the pump truck used in the test, piping costs, and disposal costs of the concrete used in the test.

[0009] Therefore, an object of the present invention is to provide a concrete pumping pump capable of saving space and a method for pumping concrete. Another object of the present invention is to provide a concrete pumpability evaluation test apparatus and a concrete pumpability evaluation test method capable of saving space and reducing costs.

Means for Solving the Problems

[0010] The present invention has been made to solve at least a part of the above problems, and can be realized as the following aspects or application examples.

[0011] [1]One aspect of the concrete pumping pump according to the present invention is a fixed base formed with a first opening and a second opening, a rotating plate rotatable about a rotation axis with respect to the fixed base, a drive mechanism for rotating the rotating plate, two cylinders fixed to the rotating plate at positions equidistant from the rotation axis, two plungers that reciprocate within the two cylinders respectively, and the two cylinders can be alternately connected to the first opening and the second opening by rotating the rotating plate by the drive mechanism, by retracting the plunger in the cylinder connected to the first opening, concrete can be accommodated in the cylinder through the first opening, by advancing the plunger in the cylinder connected to the second opening, the concrete accommodated in the cylinder can be discharged , a concrete pumping pump, and a single pipe having one end connected to the first opening and the other end connected to the second opening, and 、 alternately connecting the two cylinders to the first opening and the second opening so that concrete can be circulated and moved from the second opening to the first opening is characterized in that

[0014] 2 One aspect of the method for evaluating the pumpability of concrete according to the present invention is a first pumping step of discharging the concrete in the second cylinder connected to the second opening into a pipe having one end connected to the second opening formed in the fixed base, and sucking the concrete from the pipe having the other end connected to the first opening formed in the fixed base into the first cylinder connected to the first opening, after the first pumping step, a first rotating step of rotating the rotating plate to which the first cylinder and the second cylinder are fixed with respect to the fixed base to connect the first cylinder to the second opening and connect the second cylinder to the first opening, ​A second pumping step of discharging the concrete in the first cylinder through the second opening into the pipe and sucking the concrete from the pipe into the second cylinder; A second rotation step of rotating the rotary plate with respect to the fixed base to connect the first cylinder to the first opening and connect the second cylinder to the second opening after the second pumping step; and repeatedly circulating the concrete from the second opening to the first opening, until the inside of the pipe becomes blocked execute This is the gist.

Advantages of the Invention

[0015] According to one aspect of the concrete pumping pump and one aspect of the concrete pumping method according to the present invention, space saving can be achieved. Further, according to one aspect of the concrete pumpability evaluation test apparatus and one aspect of the concrete pumpability evaluation test method according to the present invention, cost reduction can be achieved while saving space.

Brief Description of the Drawings

[0016] [Figure 1] It is a plan view of a concrete pumping pump according to the present embodiment, showing a part in cross section. [Figure 2] It is a cross-sectional view taken along line A-A of FIG. 1. [Figure 3] It is a flowchart of a concrete pumping method according to the present embodiment. [Figure 4] It is a schematic diagram for explaining the concrete pumping method according to the present embodiment. [Figure 5] It is a schematic diagram for explaining the concrete pumping method according to the present embodiment. [Figure 6] It is a schematic diagram for explaining the concrete pumping method according to the present embodiment. [Figure 7] It is a schematic diagram for explaining the concrete pumping method according to the present embodiment. [Figure 8] It is a schematic diagram for explaining the concrete pumping method according to the present embodiment. [Figure 9] It is a plan view of a concrete pumping property evaluation test apparatus according to the present embodiment showing a part in cross section. [Figure 10] It is a flowchart of a method for evaluating the pumping property of concrete according to the present embodiment. [Figure 11] It is a schematic diagram for explaining a method for evaluating the pumping property of concrete according to the present embodiment. [Figure 12] It is a schematic diagram for explaining a method for evaluating the pumping property of concrete according to the present embodiment. [Figure 13] It is a schematic diagram for explaining a method for evaluating the pumping property of concrete according to the present embodiment. [Figure 14] It is a schematic diagram for explaining a method for evaluating the pumping property of concrete according to the present embodiment.

Embodiments for Carrying Out the Invention

[0017] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Note that the embodiments described below do not unduly limit the content of the present invention described in the claims. Also, not all of the configurations described below are essential constituent elements of the present invention.

[0018] The concrete pumping pump according to the present embodiment includes a fixed base in which a first opening and a second opening are formed, a rotating plate rotatable about a rotation axis with respect to the fixed base, a drive mechanism for rotating the rotating plate, two cylinders fixed to the rotating plate at positions equidistant from the rotation axis, and two plungers that reciprocate in the two cylinders, respectively. The two cylinders can be alternately connected to the first opening and the second opening by rotating the rotating plate by the drive mechanism, and the plunger in the cylinder connected to the first opening can be retracted to accommodate concrete into the cylinder through the first opening, and the plunger in the cylinder connected to the second opening can be advanced to discharge the concrete accommodated in the cylinder. It is characterized by being able to discharge the concrete. It is characterized in that the concrete accommodated in the cylinder can be discharged by advancing the plunger in the cylinder connected to the second opening.

[0019] The concrete pumping property evaluation test apparatus according to this embodiment is characterized by including the concrete pumping pump and a pipe having one end connected to the first opening and the other end connected to the second opening.

[0020] 1. Concrete pumping pump With reference to FIGS. 1 and 2, the concrete pumping pump 10 according to an embodiment of the present invention will be described. FIG. 1 is a plan view of the concrete pumping pump 10 according to this embodiment, showing a part in cross section, and FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1.

[0021] As shown in FIGS. 1 and 2, the concrete pumping pump 10 includes, for example, a fixed base 20 installed on a pump truck, a rotating plate 30, a drive mechanism 31, two cylinders (a first cylinder 41 and a second cylinder 51) fixed to the rotating plate 30, two plungers (a first plunger 42 and a second plunger 52) that reciprocate in the two cylinders, and a control device 60.

[0022] The fixed base 20 is formed with a first opening 21 and a second opening 22 that penetrate the fixed base 20 in a direction along the rotation axis 35. The fixed base 20 is plate-shaped with the rotating plate 30 contacting one surface, and has a pedestal at the lower end for installation on a pump truck or the like. A first pipe 24 is connected to the first opening 21 that opens on the other surface of the fixed base 20, and a second pipe 25 is connected to the second opening 22. The shape of one surface of the fixed base 20 only needs to have a flat surface that maintains a state of closing the through hole of the rotating plate during rotation, and is not limited to, for example, a rectangular shape as shown in FIG. 2, and may be a disc shape or the like.

[0023] One end of the first pipe 24 is fixed to the fixed base 20, and the other end is connected to a hopper 23 for accommodating concrete. One end of the second pipe 25 is fixed to the fixed base 20, and its interior communicates with the through holes and the cylinder of a rotating plate 30 connected to the second opening 22 via the second opening 22. The length of the second pipe 25 varies according to the construction site and, for example, has a length of several tens of meters. In this specification, "concrete" is fresh concrete containing cement, sand, gravel, and water, but does not exclude cement or mortar. The concrete in the hopper 23 is sucked through the first pipe 24 and into one of the first cylinder 41 or the second cylinder 51 via the first opening 21, and discharged from the other into the second pipe 25 via the second opening 22. That is, only two pipes, the first pipe 24 for suction and the second pipe 25 for discharge, are connected to the concrete pumping pump 10, and it is not necessary to have two suction pipes as in the prior art.

[0024] The rotating plate 30 is rotatable about a rotation axis 35 with respect to the fixed base 20. The rotation axis 35 is an imaginary line extending the rotation axis of the rotating plate 30 and, in the examples of FIGS. 1 and 2, is perpendicular to the rotating plate 30 and extends horizontally. The rotating plate 30 is substantially disc-shaped and is rotatably supported around a shaft protruding from the fixed base 20 at the position of the central rotation axis 35. Through holes are formed at two positions on the rotating plate 30 that are separated from the rotation axis 35 by a predetermined distance. The centers of both through holes and the rotation axis 35 are located on the same imaginary plane (the horizontal plane in FIGS. 1 and 2). Each through hole communicates with the first opening 21 and the second opening 22 at the rotation stop position of the rotating plate 30 (the positions in FIGS. 1 and 2). Therefore, the through holes formed in the rotating plate 30 and the fixed base 20 constitute part of the flow path through which the concrete flows together with the first pipe 24 and the second pipe 25.

[0025] The drive mechanism 31 rotates the rotating plate 30 about the rotation axis 35 with respect to the fixed base 20. As the drive mechanism 31, any known drive mechanism can be adopted as long as the rotating plate 30 can rotate. The drive mechanism 31 of the present embodiment shows an example of a rack and pinion. The drive mechanism 31 can rotate the pinion gear 34 meshing with the rack 33 forward and backward by 180 degrees each time the rotary hydraulic cylinder 32 moves the rack 33 forward and backward. Since the rack and pinion is adopted as the drive mechanism 3 1, it is configured to rotate forward and backward. However, for example, when an electric motor is adopted, it may be rotated only in one direction.

[0026] The first cylinder 41 and the second cylinder 51 have the same cylinder volume for accommodating a predetermined amount of concrete therein. The first cylinder 41 and the second cylinder 51 have the same shape. The first cylinder 41 and the second cylinder 51 can inhale and discharge concrete by means of a first plunger 42 and a second plunger 52 that can move forward and backward inside. The two cylinders (the first cylinder 41, the second cylinder 51) are fixed to the rotary plate 30 at positions equidistant from the rotation axis 35 at one end. The two cylinders (the first cylinder 41, the second cylinder 51) are fixed to a mounting plate 40 disposed opposite to the rotary plate 30 at the other end. The first cylinder 41 is fixed at a position communicating with one through-hole of the rotary plate 30, and is linearly arranged from the first pipe 24 through the first opening 21 to the first cylinder 41 at the rotation stop positions of FIGS. 1 and 2. Further, the second cylinder 51 is fixed at a position communicating with the other through-hole of the rotary plate 30, and is linearly arranged from the second pipe 25 through the second opening 22 to the second cylinder 51 at the rotation stop positions of FIGS. 1 and 2. The two cylinders (the first cylinder 41, the second cylinder 51) can be alternately connected to the first opening 21 and the second opening 22 by rotating the rotary plate 30 by a drive mechanism 31. Therefore, it is possible to alternately switch between a state where the first cylinder 41 is connected to the first opening 21 and the second cylinder 51 is connected to the second opening 22, and a state where the second cylinder 51 is connected to the first opening 21 and the first cylinder 41 is connected to the second opening 22 by rotation. The connection between each cylinder and the first opening 21 or the second opening 22 only needs to be in a communicating state so that the concrete accommodated inside can flow. It is assumed that the cylinders and the openings are connected via the through-holes of the fixed base 20 and the rotary plate 30 between each cylinder and the opening as in the present embodiment.

[0027] At the rotation stop position, the central axes of the first cylinder 41 and the second cylinder 51 are parallel to the rotation axis 35 and lie on a virtual plane (the horizontal plane in this example) through which the rotation axis 35 passes. With the rotation axis 35 as the center, the first cylinder 41 is at the 0-degree position and the second cylinder 51 is at the 180-degree position. The first cylinder 41 and the second cylinder 51 at the rotation stop position are not limited to the horizontal plane and may be in a plane inclined with respect to the horizontal plane in accordance with the positions of the first pipe 24 and the second pipe 25.

[0028] The first plunger 42 is disposed inside the first cylinder 41 and is movable forward and backward along the direction of the rotation axis 35 by a first hydraulic cylinder 43 fixed to the mounting plate 40. The second plunger 52 is disposed inside the second cylinder 51 and is movable forward and backward along the direction of the rotation axis 35 by a second hydraulic cylinder 53 fixed to the mounting plate 40. The mounting plate 40, the first hydraulic cylinder 43, and the second hydraulic cylinder 53 rotate integrally about the rotation axis 35 together with the first cylinder 41 and the second cylinder 51 due to the rotation of the rotating plate 30. The drive mechanism for moving the first plunger 42 and the second plunger 52 forward and backward is not limited to a hydraulic cylinder, and a known drive mechanism can be adopted.

[0029] The control device 60 includes, for example, a storage unit 62 that stores a control program and the like, sensors 65 and the like installed in each part of the concrete pumping pump 10, an arithmetic unit 61 that performs various calculations based on the information from the sensors 65 and the like according to the control program, an interface (not shown) that outputs commands to each drive unit based on the calculation results, and a hydraulic pump and a hydraulic circuit (not shown). The arithmetic unit 61 is composed of a CPU, and the storage unit 62 is composed of a RAM, a ROM, and the like. The sensor 65 is, for example, a magnetic proximity switch, and the arithmetic unit 61 can measure the number of discharges into the second pipe 25 based on a signal from the sensor 65 that detects the forward movement of the second plunger 52. Only one sensor 65 is shown in FIG. 1, but a sensor is similarly provided for the first cylinder 41. A plurality of sensors other than the sensor 65 are also installed in the concrete pumping pump 10, and for example, a strain gauge type sensor, an acceleration sensor, a flow meter, and the like may be provided. The hydraulic pump and The hydraulic circuit supplies hydraulic oil to the rotary hydraulic cylinder 32, the first hydraulic cylinder 43, and the second hydraulic cylinder 53. The control device 60 may further include a display device such as a liquid crystal panel and an input device operated by an operator.

[0030] The concrete pumping pump 10 drives the first hydraulic cylinder 43 and the second hydraulic cylinder 53 simultaneously according to a command from the control device 60, and by retracting the plunger (the first plunger 42 in FIG. 1) in the cylinder (the first cylinder 41 in FIG. 1) connected to the first opening 21, concrete can be accommodated in the cylinder through the first opening 21. By advancing the plunger (the second plunger 52 in FIG. 1) in the cylinder (the second cylinder 51 in FIG. 1) connected to the second opening 22, the concrete accommodated in the cylinder can be discharged. Further, the concrete pumping pump 10 that has completed the suction and discharge of concrete drives the drive mechanism 31 according to a command from the control device 60, rotates the rotary plate 30 by 180 degrees with respect to the fixed base 20, and can interchange the arrangements of the first cylinder 41 and the second cylinder 51. A more specific operation of the concrete pumping pump 10 will be described later.

[0031] Thus, according to the concrete pumping pump 10 according to the present embodiment, compared with the conventional pumping pump, the number of connection paths to the hopper 23 is reduced by one, and since the two cylinders do not move in the horizontal direction, the installation area is reduced, so space saving can be realized.

[0032] 2. Concrete pumping method Using FIGS. 1 to 8, the concrete pumping method according to an embodiment of the present invention will be described. FIG. 3 is a flowchart of the concrete pumping method according to this embodiment, and FIGS. 4 to 8 are schematic diagrams for explaining the concrete pumping method according to this embodiment using the operations of the concrete pumping pump 10 shown in FIGS. 1 and 2. Specifically, FIG. 4 shows the operation in the first pumping step (S10), FIG. 5 shows the operation in the first rotation step (S20), FIG. 6 shows the operation in the second pumping step (S30), FIG. 7 shows the operation in the second rotation step (S40), and FIG. 8 shows the operation in the first pumping step (S10) again. Note that some components such as the control device 60, the drive mechanism 31, the first hydraulic cylinder 43, and the second hydraulic cylinder 53 are omitted in FIGS. 4 to 8. Also, in FIGS. 4 to 8, the concrete 12 is shown by a screening process.

[0033] As shown in FIG. 3, the concrete pumping method according to this embodiment is characterized by repeating a first pumping step (S10), a first rotation step (S20), a second pumping step (S30), and a second rotation step (S40). By sequentially executing and repeating S10 to S40, the concrete 12 sucked from the hopper 23 can be sequentially discharged to the second pipe 25.

[0034] First, an operator starts the concrete pumping pump 10 installed in, for example, a pump truck and operates the control device 60 to start pumping the concrete 12.

[0035] As shown in Fig. 4, in the first pumping step (S10), the first plunger 42 is retracted to suck the concrete 12 from the first opening 21 formed in the fixed base 20 into the first cylinder 41 connected to the first opening 21, and the second plunger 52 is advanced to discharge the concrete 12 in the second cylinder 51 from the second opening 22 formed in the fixed base 20 to the second pipe 25 connected to the second opening 22. The discharge amount of the concrete 12 includes the volume in the through-hole of the rotary plate 30 in addition to the cylinder volume of the second cylinder 51. The second plunger 52 enters the through-hole of the rotary plate 30 beyond the fixed end of the second cylinder 51 and stops in front of the fixed base 20. Note that the flow of the concrete 12 is indicated by the arrow.

[0036] As shown in Fig. 5, in the first rotation step (S20), after the first pumping step (S10), the drive mechanism 31 (Fig. 1) is driven to rotate the rotary plate 30 to which the first cylinder 41 and the second cylinder 51 are fixed by 180 degrees in the forward direction (clockwise) with respect to the fixed base 20, connecting the first cylinder 41 to the second opening 22 and connecting the second cylinder 51 to the first opening 21. At the rotation stop position, the second cylinder 51 communicates with the first pipe 24 and the hopper 23 via the first opening 21, and the first cylinder 41 communicates with the second pipe 25 via the second opening 22. Since the rotary plate 30 slides with respect to the fixed base 20, the concrete 12 filled in the through-hole formed in the rotary plate 30 hardly leaks between the rotary plate 30 and the fixed base 20. Also, the order of the rotation direction may be from the reverse direction.

[0037] As shown in Fig. 6, in the second pumping step (S30), after the first rotation step (S20), the second plunger 52 is retracted to suck the concrete 12 from the first opening 21 into the second cylinder 51, and the first plunger 42 is advanced to discharge the concrete 12 in the first cylinder 41 from the second opening 22 to the second pipe 25.

[0038] As shown in FIG. 7, in the second rotation step (S40), after the second pumping step (S30) by driving the drive mechanism 31 (FIG. 1), the rotary plate 30 is rotated 180 degrees in the reverse direction (counterclockwise) with respect to the fixed base 20 to connect the first cylinder 41 to the first opening 21 and connect the second cylinder 51 to the second opening 22.

[0039] Then, it returns to the first pumping step (S10) shown in FIG. 8, and thereafter, the first rotation step (S20) to the second rotation step (S40) are repeatedly executed. The concrete pumping method according to the present embodiment is repeatedly executed until the operator stops the concrete pumping pump 10, and the concrete 12 is continuously pumped from the hopper 23 to the second pipe 25.

[0040] Thus, according to the concrete pumping method according to the present embodiment, the two cylinders can be alternately replaced by the rotation operation to sequentially pump the concrete 12, and the space saving of the installation area of the concrete pumping pump 10 can be realized as compared with the prior art.

[0041] 3. Concrete Pumpability Evaluation Test Apparatus The concrete pumpability evaluation test apparatus 100 according to an embodiment of the present invention will be described with reference to FIG. 9. FIG. 9 is a plan view of the concrete pumpability evaluation test apparatus 100 according to the present embodiment, showing a part in cross section. Since the pumpability evaluation test apparatus 100 has the same basic configuration as the concrete pumping pump 10, the description of the overlapping parts with the concrete pumping pump 10 in FIGS. 1 and 2 is omitted.

[0042] As shown in FIG. 9, the concrete pumpability evaluation test apparatus 100 includes a concrete pumping pump 10 and a single pipe 240 having one end connected to the first opening 21 and the other end connected to the second opening 22.

[0043] The pumping property evaluation test apparatus 100 of FIG. 9 has a single pipe 240 connected to the first opening 21 and the second opening 22 instead of the first pipe 24 and the second pipe 25 of the concrete pumping pump 10 in FIG. 1. And, in the pumping property evaluation test apparatus 100, an electric motor 310 is attached to the fixed base 20 as a drive mechanism for the rotating plate 30.

[0044] The pipe 240 is shown for an example formed in an inverted U shape by a curved portion connecting two short straight portions for the sake of illustration, but it is not limited to this. The straight portion may be set longer or a plurality of curved portions may be provided. The length and pipe diameter of the pipe 240 can be appropriately set according to the content of the evaluation test. In the illustrated example, the pipe 240 has no opening other than both ends connected to the first opening 21 and the second opening 22, but an openable and closable opening for filling the inside of the pipe 240 with concrete may be provided before the evaluation test.

[0045] The electric motor 310 is fixed to the surface of the fixed base 20 on the side opposite to the rotating plate 30. The electric motor 310 has a rotating shaft that penetrates the fixed base 20 and extends on the rotation axis 35 fixed to the rotating plate 30, and intermittently rotates the rotating plate 30 by 180 degrees around the rotation axis 35 according to a command from the control device 60.

[0046] The concrete pumping performance evaluation test device 100 drives the first hydraulic cylinder 43 and the second hydraulic cylinder 53 according to commands from the control device 60, and retracts the plunger (the first plunger 42 in FIG. 9) in the cylinder (the first cylinder 41 in FIG. 9) connected to the first opening 21, so that concrete can be accommodated from the pipe 240 into the cylinder through the first opening 21. At the same time, the plunger (the second plunger 52 in FIG. 9) in the cylinder (the second cylinder 51 in FIG. 9) connected to the second opening 22 is advanced, so that the concrete accommodated in the cylinder can be discharged into the pipe 240. Further, when the suction and discharge are completed, the concrete pumping performance evaluation test device 100 drives the electric motor 310 according to commands from the control device 60, and rotates the rotating plate 30 by 180 degrees with respect to the fixed base 20, so that the arrangements of the first cylinder 41 and the second cylinder 51 can be interchanged. Specific operations of the concrete pumping performance evaluation test device 100 will be described later.

[0047] The concrete pumping performance evaluation test device 100 according to the present embodiment can circulate the concrete 12 in the pipe 240 in one direction. Therefore, compared with the conventional actual pipe test, the pumping performance can be evaluated with a shorter pipe 240. And since the pipe 240 can be shortened, space saving of the test equipment can be realized, and the equipment cost can also be reduced. In addition, since the concrete 12 filled in the concrete pumping performance evaluation test device 100 only circulates, the cost of disposing of the used concrete can be significantly reduced. Furthermore, the concrete pumping performance evaluation test device 100 can flow the concrete in the pipe 240 in one direction in the same manner as the conventional actual pipe test, so that a pumping state similar to the actual pipe test can be simulated. In particular, the change in the properties of the concrete during pumping is generally due to changes over time, and is mainly caused by the shear deformation (pulsation) of the concrete in the pipe accompanying the discharge of the concrete through the cylinder of the pumping pump. However, since the concrete pumping performance evaluation test device 100 can simulate the pulsation in one direction in the pipe 240, it can reproduce the change in properties similar to the actual pipe test.

[0048] 4. Concrete pumping performance evaluation test method Using FIGS. 9 to 14, a method for evaluating the pumpability of concrete 12 according to an embodiment of the present invention will be described. FIG. 10 is a flowchart of the method for evaluating the pumpability of concrete 12 according to the present embodiment, and FIGS. 11 to 14 are schematic diagrams for explaining the method for evaluating the pumpability of concrete 12 according to the present embodiment using the operation of the pumpability evaluation test apparatus 100. Specifically, FIG. 11 shows the operation of the first pumping step (S12), FIG. 12 shows the operation of the first rotation step (S22), FIG. 13 shows the operation of the second pumping step (S32), and FIG. 14 shows the operation of the second rotation step (S42). In FIGS. 11 to 14, for the sake of clarity of the circulating state of the concrete 12, the concrete 12 having a volume four times that of the cylinder volume is circulated by four types of meshing processes, but it can be changed according to the length of the pipe 240 and the cylinder volume.

[0049] First, an operator fills a circulation path including the pipe 240 in the pumpability evaluation test apparatus 100 with the concrete 12 prepared in advance, for example, and operates the control device 60 to start the pumpability evaluation test of the concrete 12.

[0050] As shown in FIG. 10, the method for evaluating the pumpability of the concrete 12 is characterized by repeating the first pumping step (S12), the first rotation step (S22), the second pumping step (S32), and the second rotation step (S42) until the inside of the pipe 240 is in a blocked state. The method for evaluating the pumpability repeats S12 to S42 to circulate the concrete 12 in one direction inside the pipe 240. The method for evaluating the pumpability may further include a first determination step (S14) and a second determination step (S34) for determining whether or not the inside of the pipe 240 is in a blocked state.

[0051] As shown in Fig. 11, in the first pumping step (S12), the second plunger 52 is advanced to discharge the concrete 12 in the second cylinder 51 connected to the second opening 22 formed in the fixed base 20 into the pipe 240 with one end connected to the second opening 22, and the first plunger 42 is retracted to suck the concrete 12 from the pipe 240 with the other end connected to the first opening 21 formed in the fixed base 20 into the first cylinder 41 connected to the first opening 21. Therefore, the same amount of concrete 12 as that discharged from the second cylinder 51 is sucked into the first cylinder 41.

[0052] The first determination step (S14) is executed, for example, after the first pumping step (S12). The first determination step (S14) determines, by the arithmetic unit 61 (Fig. 9), whether or not the inside of the pipe 240 is in a blocked state based on the measurement results of, for example, a strain gauge (not shown) installed in the pipe 240 or a pressure gauge of the second hydraulic cylinder 53. The blocked state means a state in which the fluidity of the concrete 12 moving in the pipe 240 is significantly reduced, for example, a state in which the measurement result of the sensor exceeds a predetermined threshold value. If it is determined by the arithmetic unit 61 that the state is blocked, the evaluation test ends. If it is determined that the state is not blocked, the first rotation step (S22) is executed. In the present embodiment, the first determination step (S14) and the second determination step (S34) described later are provided after each pumping step. However, the present invention is not limited to this, and the output values from the respective sensors may be constantly monitored, and the pumping performance evaluation test may be ended even during each step (S12, S22, S32, S42) if a predetermined threshold value is exceeded.

[0053] As shown in Fig. 12, in the first rotation step (S22), after the first pumping step (S12), the electric motor 310 is driven to rotate the rotating plate 30 to which the first cylinder 41 and the second cylinder 51 are fixed with respect to the fixed base 20, so that the first cylinder 41 is connected to the second opening 22 and the second cylinder 51 is connected to the first opening 21. At this time, the first cylinder 41 is filled with the concrete 12 sucked in the first pumping step (S12) and is in a state where the concrete 12 can be discharged toward the second opening 22.

[0054] As shown in FIG. 13, in the second pumping step (S32), the first plunger 42 is advanced to discharge the concrete 12 in the first cylinder 41 through the second opening 22 into the pipe 240, and the second plunger 52 is retracted to suck the concrete 12 from the pipe 240 into the second cylinder 51. In the first pumping step (S12) and the second pumping step (S32), the concrete 12 in the pipe 240 is always pumped in only one direction.

[0055] In the second determination step (S34), the arithmetic unit 61 (FIG. 9) determines whether or not the inside of the pipe 240 is in a blocked state based on the measurement results of each sensor or the like. If it is determined by the arithmetic unit 61 that the state is a blocked state, the evaluation test ends, and if it is determined that the state is not a blocked state, the second rotation step (S42) is executed.

[0056] As shown in FIG. 14, in the second rotation step (S42), after the second pumping step (S32), the electric motor 310 is driven to rotate the rotary plate 30 with respect to the fixed base 20 to connect the first cylinder 41 to the first opening 21, and the second cylinder 51 is connected to the second opening 22. By repeating the steps of S12 to S42 until the inside of the pipe 240 is in a blocked state, the concrete 12 circulates in the first cylinder 41, the pipe 240, and the second cylinder 51, and the pumping performance evaluation test of the concrete 12 using the actual pipe can be simulated and reproduced. Further, the pumping distance is obtained by multiplying the stroke lengths of the first plunger 42 and the second plunger 52 by the number of discharges from the first opening 21. The number of discharges may be measured by the arithmetic unit 61, for example, the number of signals from the sensor 65.

[0057] The pumping performance evaluation test method according to the present embodiment can evaluate the pumping performance with a very short pipe 240 as compared with the conventional actual pipe test, so that the space saving of the test equipment can be realized, and the equipment cost and the cost of disposing of the used concrete 12 can be significantly reduced.

[0058] The present invention is not limited to the above-described embodiments, and various modifications are possible. For example, the present invention includes a configuration that is substantially the same as the configuration described in the embodiments (for example, a configuration having the same functions, methods, and results, or a configuration having the same objectives and effects). In addition, the present invention includes a configuration in which a non-essential part of the configuration described in the embodiments is replaced. Further, the present invention includes a configuration that exhibits the same operational effects as the configuration described in the embodiments or a configuration that can achieve the same objective. Moreover, the present invention includes a configuration in which a known technique is added to the configuration described in the embodiments.

Explanation of Reference Numerals

[0059] 10… Concrete pumping pump, 12… Concrete, 20… Fixed base, 21… First opening, 22… Second opening, 23… Hopper, 24… First pipe, 25… Second pipe, 30… Rotating plate, 31… Driving mechanism, 32… Rotary hydraulic cylinder, 33… Rack, 34… Pinion gear, 35… Axis of rotation, 40… Mounting plate, 41… First cylinder, 42… First plunger, 43… First hydraulic cylinder, 51… Second cylinder, 52… Second plunger, 53… Second hydraulic cylinder, 60… Control device, 61… Arithmetic unit, 62… Storage unit, 65… Sensor, 100… Pumpability evaluation test device, 240… Pipe, 310… Electric motor

Claims

1. A fixed base formed with a first opening and a second opening, a rotating plate rotatable about a rotation axis with respect to the fixed base, a drive mechanism for rotating the rotating plate, two cylinders fixed to the rotating plate at positions equidistant from the rotation axis, two plungers that reciprocate within the two cylinders respectively, comprising: the two cylinders can be alternately connected to the first opening and the second opening by rotating the rotating plate by the drive mechanism, by retracting the plunger in the cylinder connected to the first opening, concrete can be accommodated in the cylinder through the first opening, a concrete pumping pump, wherein by advancing the plunger in the cylinder connected to the second opening, the concrete accommodated in the cylinder can be discharged, a single pipe having one end connected to the first opening and the other end connected to the second opening, comprising: A concrete pumping performance evaluation test device, characterized in that the two cylinders can be alternately connected to the first opening and the second opening to circulate concrete from the second opening to the first opening.

2. Discharge the concrete in the second cylinder connected to the second opening into the pipe with one end connected to the second opening formed in the fixed base, and suck the concrete from the pipe with the other end connected to the first opening formed in the fixed base into the first cylinder connected to the first opening The first pumping step; After the first pumping step, rotate the rotating plate to which the first cylinder and the second cylinder are fixed with respect to the fixed base to connect the first cylinder to the second opening and connect the second cylinder to the first opening in the first rotation step; The second pumping step of discharging the concrete in the first cylinder through the second opening into the pipe and sucking the concrete into the second cylinder from the pipe; After the second pumping step, rotate the rotating plate with respect to the fixed base to connect the first cylinder to the first opening and connect the second cylinder to the second opening in the second rotation step; A method for evaluating the pumping performance of concrete, characterized by repeating the above steps to circulate the concrete from the second opening to the first opening until the inside of the pipe is in a blocked state.

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