JP2001073932A - Pipeline switching method for ready mixed concrete force-feeding pump and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable force-feeding of the remainder in a force-feeding pipe with water by connecting a washing pipe connecting portion to the force-feeding pipe so as to force-feed wash water into the washing pipe connecting portion after the stop of a ready mixed concrete force-feeding device. SOLUTION: On a fixing bracket 21 wherein a washing pipe connecting portion 23 and a ready mixed concrete pipe connecting portion 22 are respectively joined on one end side and the other end side, a selecting plate 27 joining a force-feeding pipe connecting portion 29 at one end portion side is connected. The selecting plate is rotatably journalled to the fixing bracket 21 with a shaft 24, and turned over about the shaft 24 to enable selectively joining between the force-feeding pipe connecting portion 29 and the ready mixed concrete pipe connecting portion 22 or the washing pipe connecting portion 23. The force-feeding pipe connecting portion 29 is connected to the washing pipe connecting portion 23 by turning over the selecting plate 27 to force-feed wash water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for switching pipes in a pump for pumping ready-mixed concrete, and more particularly to a pumping method laid to a required length after completion of the pumping of ready-mixed concrete by the pump for transferring ready-mixed concrete. The present invention relates to a novel method and apparatus for processing by pumping residual ready-mixed concrete remaining in a pipe for water to a final pumping point together with water and for cleaning the inside of the pipe for pumping.

[0002]

2. Description of the Related Art A ready-mixed concrete pumping device of the piston type comprises a hopper for charging ready-mixed concrete from a mixer truck, and a suction / discharge switching valve connected to a suction port at a lower portion of the hopper to perform a suction / discharge operation of a concrete cylinder. The provided valve box, a pair of concrete cylinders fixed facing the valve box, concrete packings respectively inserted in the concrete cylinders, rods respectively connected to the concrete packings, It consists of a pair of hydraulic cylinder devices that move back and forth in the axial direction, and operate the suction / discharge switching valve to discharge the ready-mixed concrete with the other concrete cylinder while the other concrete cylinder sucks the mixed concrete. To continuously pump ready-mixed concrete And it is configured to be able to pump into the pipe. Such a device is often used as a mobile type or a stationary type mounted on a vehicle for various types of construction and civil engineering works.

In order to collectively send the ready-mixed concrete discharged from the pair of concrete cylinders to a single pipe, a Y-shaped pipe is detachably connected to a discharge port of a valve box. As described above, the ready-mixed concrete pumping apparatus is capable of continuous pumping by alternate suction and discharge operations of a pair of concrete cylinders.

[0004] When the ready-mixed concrete pumping device is stopped, the ready-mixed concrete fills the pumping pipe laid from the ready-mixed concrete pumping device to the ready-cast concrete placing site over a required length (sometimes several hundred meters). It will be. The ready-mixed concrete remaining in the pipe for pumping is also calculated in the amount to be poured, and is also pumped to the setting site as quickly as possible so that the ready-mixed concrete does not separate, and It is necessary to cast. That is, the amount of ready-mixed concrete to be pumped by the ready-mixed concrete pumping device is an amount obtained by allowing a certain amount of room for the required amount of poured concrete. Is not pumped to the casting site and remains in the pumping pipe. This becomes more remarkable as the length of the pressure feed pipe becomes longer.

[0005] Therefore, after the ready-mixed concrete pumping device is stopped, the ready-mixed concrete pumping device is separated from the ready-mixed concrete pumping device.
It is essential that the ready-mixed concrete remaining in the pumping pipe be pumped to the casting site and discharged, and that the inside of the pumping pipe be cleaned.

For this reason, conventionally, high-pressure water has been pumped into a pressure-feeding pipe, and the remaining ready-mixed concrete has been pumped to the casting site with this water, and the inside of the pressure-feeding pipe has been washed. Also, if you try to pump with only water, the ready-mixed concrete will be washed just with water, the ready-mixed concrete will be separated into aggregate and cement milk, and only the aggregate will remain in the pumping pipe. Finally, they will be blocked. Therefore, a cleaning material such as sponge or urethane is inserted to separate the water and the ready-mixed concrete, and the cleaning material is pressure-fed with water.
That is, the cleaning material plays a role of concrete packing.

[0007] As a method, a pipe for pumping is separated from the ready-mixed concrete pumping apparatus, and a high-pressure water pump dedicated to pumping water separately from the ready-mixed concrete pumping apparatus is connected.
A method of pumping this water into the pressure feed pipe is common.
However, in such a conventional method, after stopping the ready-mixed concrete pumping device, it is necessary to close the mortar stopper, disconnect the pumping pipe from the ready-mixed concrete pumping device, and connect a high-pressure water pump.
In addition to complicating the operation, there is a fear that ready-mixed concrete may flow out during the operation. Furthermore, if the pressure-feeding pipe laid at a predetermined length is cut off, there is another problem that it is extremely difficult to re-align and join the pressure-feeding pipe due to expansion and contraction of the pressure-feeding pipe due to the pressure of the pressure. Was. Further, in actual work, the pressure feed pipe must be disconnected to connect to a water pump or the like, and a cleaning material such as a sponge body to be fed under pressure to wash the inside of the pipe must be inserted into the pipe. The work is difficult and cumbersome.

Accordingly, the applicant has disclosed Japanese Patent Application Laid-Open No. 1-257776.
No. 1 provides an apparatus capable of performing water pressure feeding without disconnecting a pressure feeding pipe. According to this device,
It is possible to freely switch between the work of pumping ready-mixed concrete and the work of pouring water without disconnecting the pipe for pumping.
However, since the water casting pipe is located in the linear direction of the pressure feeding pipe, the space for inserting the cleaning material is limited to the length dimension of the water casting pipe, and only about 1 to 2 pieces are inserted. Can not do it. If the pressure feed pipe is short, there is no problem, but if it is long, the cleaning material is compressed and water is removed, causing the same drawbacks as described above. Therefore, it is necessary to insert a required number of cleaning materials according to the length of the pressure feeding pipe. However, for this purpose, conventionally, there has been only a means for cutting a pressure-feeding pipe filled with residual ready-mixed concrete. In addition, the hopper was left as it was during the water pouring, so that the hopper could not be washed, and water could not be pumped using the fresh concrete pumping pump body.

[0009] Further, as disclosed in Japanese Patent Application Laid-Open No. Hei 2-2000015, the applicant connects a washing pipe connection part to the pumping pipe after stopping the pumping of the ready-mixed concrete feeding device, and inserts a flexible solid material inserted into the washing pipe connection part. In a pipe switching method of a ready-mixed concrete pumping apparatus for pumping and treating residual ready-mixed concrete in a pumping pipe together with water by pumping cleaning water together with a cleaning material, an opening for inserting a cleaning material at a cleaning pipe connection portion is pumped. A pipe switching method of a ready-mixed concrete pumping apparatus, characterized in that a required number of cleaning materials are inserted in advance in a connecting section for cleaning by bending in a direction different from the direction, and a discharge of the ready-mixed concrete pumping apparatus. A switching device is connected to the pipe, and a pressure feeding pipe is connected to the switching device so as to face the discharge pipe, and the switching device is connected to the discharge pipe and the pressure feeding pipe. A ready-mixed concrete pumping device, characterized in that a ready-mixed concrete pipe connecting portion for connecting and communicating with a washing pipe connecting portion for connecting and communicating with the pressure-feeding pipe are integrally and slidably disposed. A residue treatment device was provided.

[0010]

However, in this last Japanese Patent Application Laid-Open Publication No. H2-20015, the opening for inserting the cleaning material in the cleaning pipe connection portion is formed in a direction different from the pressure feeding direction, and the opening is formed. The direction is different from the pressure feeding direction by about 90 degrees, so the bending curvature of the cleaning pipe connection becomes large, and the movement of the soft solid cleaning material is not performed smoothly. There was a case where a parting blockage occurred. In addition, the hopper was left as it was during the water pouring, so that the hopper could not be washed, and water could not be pumped using the fresh concrete pumping pump body.

Accordingly, the present invention relates to a novel structure for removing fresh concrete and the like remaining in a pressure-feeding pipe laid to a required length and for cleaning the inside of the pressure-feeding pipe. An object of the present invention is to provide a piping switching method and a piping switching device for a pump.

[0012]

In order to achieve the above-mentioned object, after the ready-mixed concrete pumping by the ready-mixed concrete pump has been completed, a washing pipe connection is connected to the pumping pipe and washing water is supplied into the washing pipe connection. In the pipe switching method of the ready-mixed concrete pump for treating the remaining ready-mixed concrete in the pumping pipe together with water by pumping, the pipe connection section for the ready-mixed concrete section and the pipe connection section for washing are fixedly connected. After the pipe connection for pressure feed is connected to the switching plate in contact with the bracket, the pipe connection for pressure feed and the pipe connection for ready-mixed concrete are connected, and the ready-mixed concrete is pumped. Provided is a piping switching method in a ready-mixed concrete pump for pumping washing water by connecting a piping connection for pumping and a piping connection for washing with each other.

A switching bracket in which a pressure-feeding pipe connection is connected to one end of a fixed bracket having one end connected to a first pipe connection and the other end connected to a second pipe connection. The plate is brought into contact with the other end, and the other end is rotatably mounted on the fixed bracket. The switching plate is turned around the surface of the switching plate at the contact surface, and the pressure-feeding pipe connection and the first pipe connection or the first pipe are connected. Disclosed is a pipe switching device in a ready-mixed concrete pump for pumping, which enables alternate communication connection with a second pipe connecting section so that the pumping pipe connecting section can branch in two directions.

[0014] Further, after the ready-mixed concrete pumping by the ready-mixed concrete pump is completed, the cleaning pipe connection is connected to the pumping pipe, and the cleaning water is pumped into the cleaning pipe connection, so that the residual water in the pumping pipe is removed. In a pipe switching device of a ready-mixed concrete pump for pumping and processing ready-mixed concrete together with water, a fixed bracket is connected to a connecting section for washing pipe on one end side and a connecting section for ready-mixed concrete on the other end side. The switching plate, which is connected to one end of the pipe connection for pressure feeding, is brought into contact with the other end, and the other end is rotatably mounted on the fixed bracket. A piping switching device in a ready-mixed concrete pump that enables an alternative communication connection between the pressure connection and the ready-mix concrete connection or the cleaning connection. To provide. The fixed bracket has a substantially semicircular arc portion having a predetermined radius around which the one end portion rotates about the other end portion of the switching plate, and the left and right sides of the arc portion are provided at one end portion of the switching plate. A configuration in which an engagement recess that can be engaged with and disengaged from the protruding engagement pin is formed,
The pressure-feeding pipe connection portion is configured to have a gentle and substantially S-shaped shape having a small curvature.

According to the present invention having the above-described structure, when the pump for feeding the ready-mixed concrete in the pump for feeding the ready-mixed concrete is finished, when the pumping pipe is washed, the switching plate is connected to the fixed bracket around the axis at the other end. By turning over the surface and rotating the pressure-feeding pipe connection by about 180 degrees to connect with the cleaning-pipe connection, the pressure-feeding pipe can be easily cleaned. In addition, by switching the first pipe connection and the second pipe connection, the pressure of the ready-mixed concrete can be branched in two directions.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiment. FIG. 1 shows a schematic configuration example of a system in which ready-mixed concrete pumped to a predetermined location using a ready-mixed concrete pump 3 is sprayed and driven by air on a retaining wall, in a tunnel, or the like. As shown, a hopper 2 receiving ready-mixed concrete from a mixer truck 1
And the bent pipe 5 is connected to the discharge pipe 34 connected to the valve box 4 of the ready-mixed concrete pump 3,
A throttle pipe 6 is connected to the bent pipe 5, a pipe switching device 7 according to the present invention is connected to the throttle pipe 6, and a required number of pressure-feeding pipes 8 are connected to the pipe switching apparatus 7 in a predetermined manner. A length piping path is formed. A high-pressure hose 9 is connected to the tip of the pressure-feeding pipe 8, and the high-pressure hose 9
Is connected to a sensor tube 10 and an air merging tube 11, a material hose 12 is connected to the air merging tube 11, and a spray nozzle 13 is connected to the material hose 12. A pig detection sensor 14 is attached to the sensor tube 10, and the pig detection sensor 14 is electrically connected to the fresh concrete pump 3 via a cap tire cable 15. Also, a quick-setting agent hose 17 is connected to the air merging tube 11 from a liquid quick-setting agent supply device 16 attached to the ready-mixed concrete pump 3, and an air compressor 19 is connected to the air merging tube 11 via an air hose 18. It is connected. Further, the sensor pipe 10 to which the pig detection sensor 14 is attached may be provided at the tip of the pressure feeding pipe 8.

Therefore, the ready-mixed concrete is sprayed through the valve box 4, the bent pipe 5, the throttle pipe 6, the pipe switching device 7, the pressure feed pipe 8, the high pressure hose 9, the sensor pipe 10 and the air merge pipe 11, and the material hose 12 13
Then, the ready-mixed concrete is discharged together with the air and the liquid quick-setting admixture and sprayed and poured into a predetermined location. here,
At the stage where the pumping of the ready-mixed concrete by the ready-mixed concrete pump 3 is stopped, the ready-mixed concrete remains in the pumping pipe 8 and the remaining ready-mixed concrete is included in the punching design amount. It is necessary to perform the driving by pressure feeding to the set location and to clean the inside of the pressure feeding pipe 8. Therefore, a cleaning material such as sponge or urethane is inserted into the pressure-feeding pipe 8, and the cleaning material is pressure-fed with cleaning water to thereby provide a pressure-feeding pipe 8, a high-pressure hose 9, a sensor pipe 10, an air merging pipe 11, and a material. It is necessary to process the remaining ready-mixed concrete in the hose 12 and the spray nozzle 13 by pumping.

FIG. 2 shows this state of water pouring. A water discharge hose 33 is connected to the pressure feeding pipe 8 via a pipe switching device 7. This water discharge hose 3
3 is connected to the water discharge port of the ready-mixed concrete pump 3. That is, the ready-mixed concrete pump 3 opens the hopper 2 to expose the discharge port of the ready-mixed concrete, and attaches the connector 35 to the discharge port.
5 is connected to a hose 32 for sucking water from the water tank 20, sucks water into the pump 3 for pumping the ready-mixed concrete, and discharges the sucked water from the hose 33 for discharging water. Then, a water discharge hose 33 is connected to the pressure feeding pipe 8 via the pipe switching device 7.

FIGS. 3 and 4 show details of the piping switching device 7. FIG. Ready-mixed concrete pipe connection part 22 (first pipe connection part) for connecting to the restriction pipe 6 of the ready-mixed concrete pump 3
And the washing pipe connection 2 connected to the water discharge hose 33
3 (second pipe connection part) and a fixed bracket 21 that is connected to both end sides thereof, and the shaft 24 is orthogonal to the center between the ready-container pipe connection part 22 and the washing pipe connection part 23. And has an arc portion 25 having a circumference of a predetermined radius centered on the shaft 24, and U-shaped engaging concave portions 26, 26 are formed on both ends of the arc portion 25 so as to open upward. Have been.

The switching plate 27 is in contact with the fixed bracket 21, and the switching plate 27 has one end thereof fitted to the shaft 24.
The switching plate 27 is connected to a pressure feed piping connection portion 29 together with the end plate 30. On the other end side of the switching plate 27, the engagement recess 2 of the fixed bracket 21 is provided.
Attachment members 31 such as detachable bolts and nuts are attached to 6, 26. A pipe connecting portion 29 for pressure feeding connected to the pipe 8 for pressure feeding has a gentle S-shape with a small curvature and a cylindrical shaft 28 is connected by welding or the like. In the state shown in the drawing, the pipe connecting portion 29 for pressure feed is the pipe connecting portion 22 for ready-mixed concrete.
Communicate with The switching plate 27 is moved 1 around the shaft 24.
When inverted by 80 degrees, the pressure-feeding pipe connection part 29 communicates with the cleaning pipe connection part 23. For this reason, the pressure pipe connection 2
9 so that it can rotate at least 180 degrees freely,
It is preferable to interpose a water-tight universal joint such as a swivel at the end portion 29a.

Therefore, as shown in FIGS. 5 and 6, the switching plate 27 is turned 180 degrees around the shaft 24, and the locking member 31 is engaged with one of the engaging concave portions 26 to be fastened and fixed. The pipe connection part 29 and the ready-mixed concrete pipe connection part 22 are connected and connected to each other.
The fresh concrete blows out from. After the ready-mixed concrete is pumped, the remaining ready-mixed concrete in the pumping pipe 8, the high-pressure hose 9, the sensor pipe 10, the air merging pipe 11, the material hose 12, and the spray nozzle 13 is pumped together with the water supplied in the water tank 20 for treatment. For this purpose, as shown in FIG.
And the locking tool 31 is turned to the opposite
To connect the pressure-feeding pipe connection portion 29 and the cleaning pipe connection portion 23 so as to communicate with each other, and to pressurize the cleaning water fed from the water discharge hose 33 connected to the cleaning pipe connection portion 23. Supply to piping 8. At this time, the cleaning pipe connection 2
3 is preliminarily made of sponge or urethane, and an appropriate number of cleaning materials for separating the water to be fed and the ready-mixed concrete are inserted in advance. In addition, a pig for detection is incorporated in the cleaning material so that the position of the cleaning material can be detected, and the final position of the remaining ready-mixed concrete is confirmed by the pig detection sensor 14. Residual concrete is discharged from the spray nozzle 13 through the pressure-feeding pipe 8, the high-pressure hose 9, the sensor pipe 10, the air merging pipe 11, and the material hose 12 by the flushing water fed. Then, when the pig detection sensor 14 detects the detection pig, the pumping of the washing water is terminated. Further, by equipping the switching device according to the present invention at the front end portion of the pressure feeding pipe 8 or just before the air merging pipe 11, the cleaning material can be discharged and taken out.

As shown in FIGS. 5 and 6, a mortar stopper 36 is connected between the pipe switching device 7 and the pressure feeding pipe 8, and a pipe connection portion for ready-mixed concrete using the pipe switching device 7. At the time of switching between the washing pipe connecting portion 23 and the washing pipe connecting portion 23, the ready-mixed concrete in the pressure feeding pipe 8 is temporarily stopped so as not to flow backward.

Further, by using the ready-mixed pipe connecting section 22 as a first pipe connecting section and the washing pipe connecting section 23 as a second pipe connecting section, different pressure feeding pipes 8 are connected to each other. The ready-mixed concrete pump can be used to cast ready-mixed concrete in two directions, and can be used as a two-way branching device for branching the pipe connection for pumping in two directions. Furthermore, it is also possible to increase the number of branches in three, four, and four directions by increasing the number of pipe connections, such as the third pipe connection and the fourth pipe connection.

[0024]

According to the present invention described above, the ready-mixed concrete remaining in the pressure-feeding pipe can be lightly and quickly pumped by interposing the pipe switching device in the pressure-feeding pipe, and the pressure-feeding pipe can be processed. The inside can be cleaned. In addition, the pipe switching device simply and easily switches the switching plate by 180 degrees, and easily and quickly connects the pressure feeding pipe to the cleaning pipe connection or connects the pressure feeding pipe to the ready-mixed concrete pipe connection. The workability is improved because the pressure-feeding pipe itself on the side to be washed does not need to be moved and its position does not change. Further, according to the switching device of the present invention, it is not necessary to disconnect the pressure-feeding pipe at the time of pouring water, so that the conventional disadvantage that the once-disconnected pressure-feeding pipe cannot be connected again can be solved. And so on.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory diagram of a ready-mixed concrete pumping system including a water casting device.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a plan view showing an embodiment of the present invention.

FIG. 4 is a right side view showing the embodiment of the present invention.

FIG. 5 is a diagram illustrating the operation of the present invention.

FIG. 6 is a diagram illustrating the operation of the present invention.

[Explanation of symbols]

 3 ... Pump for feeding fresh concrete 5 ... Bent pipe 6 ... Restriction pipe 7 ... Pipe switching device 8 ... Piping for feeding 20 ... Water tank 21 ... Fixed bracket 22 ... Pipe connection part for ready-mixed concrete 23 ... Pipe connection part for washing 24 ... Shaft 25 ... Arc part 26 ... Engaging recess 27 ... Switching plate 28 ... Cylinder shaft 29 ... Piping connection part 30 ... End plate 31 ... Locking tool 32 ... Hose for water suction 33 ... Hose for water discharge 34 ... Discharge pipe 36 ... Mortar stopper Reference number P2990

Claims (5)

[Claims] 1. After the ready-mixed concrete pumping by the ready-mixed concrete pump is completed, the cleaning pipe connection is connected to the pumping pipe, and the cleaning water is pumped into the cleaning pipe connection, so that the residual water in the pumping pipe is removed. A pipe switching method for a ready-mixed concrete pump for pumping and processing ready-mixed concrete together with water, comprising: a connecting pipe for connecting a ready-mixed concrete pipe and a connecting section for washing, which are connected to a fixed bracket connected to each other; After connecting the connection part, and connecting the pipe connection for pressure feed and the pipe connection for ready-mixed concrete to pump the ready-mixed concrete, the switching plate is turned over at the contact surface, and the pipe connection for pressure feed and the connection for washing pipe are connected. A method for switching pipes in a pump for pumping ready-mixed concrete, comprising: 2. A switching device in which a pressure pipe connection is connected to one end of a fixed bracket having a first pipe connection at one end thereof and a second pipe connection at the other end thereof. The plate is brought into contact with the other end, and the other end is rotatably mounted on the fixed bracket. The switching plate is turned around the surface of the switching plate at the contact surface, and the pressure-feeding pipe connection and the first pipe connection or the first pipe are connected. 2. A piping switching device in a pump for pumping concrete feed, characterized in that alternative communication connection with the piping connection of No. 2 is made possible and the piping connection for pressure feeding can be branched in two directions. 3. After the pumping of the ready-mixed concrete by the ready-mixed concrete pump, the cleaning pipe connection is connected to the pumping pipe, and the cleaning water is pumped into the cleaning pipe connection, so that the residual water in the pumping pipe is removed. In a pipe switching device in a pump for pumping ready-mixed concrete, which pumps and processes ready-mixed concrete together with water, a fixed bracket is connected to a pipe connection for washing at one end and a pipe connection for ready-mixed concrete at the other end. The switching plate, which has the piping connection for pressure feeding connected to one end, is in contact with the other end, and the other end is rotatably mounted on the fixed bracket.
The switching plate is inverted at the contact surface with the shaft as a center, thereby enabling selective communication connection between the pressure feeding pipe connection and the ready-mixed pipe connection or the washing pipe connection. A piping switching device in a ready-mixed concrete pump. 4. The fixed bracket has a substantially semicircular arc portion having a predetermined radius around which the one end rotates about the other end of the switching plate, and the switching plate is provided on both left and right sides of the arc portion. The piping switching device for a pump for pumping ready-mixed concrete according to claim 2, wherein an engagement recess is formed at one end of the pump, the engagement recess being capable of engaging and disengaging with an engagement pin protruding. 5. The piping switching device for a pump for pumping ready-mixed concrete according to claim 2, wherein the pressure-feeding pipe connecting portion has a gentle and substantially S-shaped shape having a small curvature.