JPH0451913Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a concrete pump that can efficiently collect the washing water for discharging the fresh concrete remaining in the transport pipe after concrete pouring work is completed. This invention relates to a transport pipe cleaning device.

[Prior Art] Generally, when pouring fresh concrete using a concrete pump truck, the concrete pump truck and the pouring site are connected through a transport pipe.
Fresh concrete is sent to the pouring site via this transport pipe. In order to remove the concrete remaining in the transport pipe at the end of the pumping work of fresh concrete, the transport pipe is removed from the concrete pump and high-pressure water or high-pressure air is pumped into the transport pipe to transport the concrete to the pouring site. An extrusion operation, that is, a removal operation called water cleaning or air cleaning is performed.

The latter type of air cleaning is a relatively simple method, but the compressed air used for air cleaning not only carries the risk of sudden blowouts and ruptures, but also cannot obtain very high pressure, so it cannot be used in high places or over long distances. The disadvantage was that it was difficult to clean the pipes.

Therefore, the work of removing the remaining ready-mixed concrete in the transport pipe is carried out using a water supply device B having a water tank 31 and a water pump 32 as shown in FIG. In that case, as shown in FIG. 3, the base end 33a of the transport pipe 33 is separated from the concrete pump (not shown), and the base end is filled with a stuffing material 34 such as sponge inside.
The stuffing pipe 35 is connected (see FIG. 3), and the other end 35a of the stuffing pipe 35 is connected to the pressure feeding pipe 36 on the discharge side of the water pump 32. Then, the water pump 32 of the water supply device B is operated to connect the pressure pipe 36 to the stuffing pipe 3.
5, high pressure water is sent to the other end 33b of the transport pipe 33, and the filling is pushed into the transport pipe 33 by the pressure, thereby removing the remaining fresh concrete inside the transport pipe 33.
(See Figure 4).

[Problems to be solved by the invention] By the way, in the case of the above-mentioned vehicle-mounted concrete pump, the capacity of the water tank 31 is limited, and in order to use water as effectively as possible, it is necessary to In order to prevent it from being discharged at the site and contaminating the surrounding area, it is desirable to recover the water once used for cleaning the transport pipe 33, that is, the water filling the transport pipe 33 in FIG. 4. At that time, the recovery shutoff valve 38 of the recovery piping 37 that connects the pressure-feeding piping 36 and the water tank 31 is opened to recover the water.
If the transport pipe 33 is located higher than the water tank 31, it is possible to collect the water, but it is a natural inflow due to the height difference, and it takes time to collect the water. When the transport pipe 33 is lower, there is a problem that recovery is difficult.

[Means for Solving the Problems] In order to solve the above problems, this invention includes a water tank and a suction pipe having a three-way switching valve to suck water from the water tank and a first suction pipe having a three-way switching valve. A water pump is provided to supply water to the concrete transport pipe via a pressure pipe having an on-off valve, and a recovery shut-off valve and a strainer are provided between the transport pipe and the suction pipe to drain water in the transport pipe. One end of the recovery pipe for suction and reverse transport by the water pump is connected to the transport pipe and the above-mentioned first pipe.
It is provided in the piping between the on-off valve and the other end is connected to the suction piping between the three-way switching valve and the water pump, and has a return valve between the pressure-feeding piping and the water tank, so that the water is not fed backwards. A return piping for returning the water to the water tank is provided with one end connected to the pressure-feeding piping between the first on-off valve and the water pump, and an external water source piping is connected to the three-way switching valve. A car wash nozzle having a second on-off valve is connected to the piping between the first on-off valve and the water pump.

[Function] In such a concrete pump transport pipe cleaning device, when supplying water for cleaning to the transport pipe, the water is transferred from the water tank to the suction pipe, the water pump,
It is sent to the transport pipe via the pressure pipe. In addition, when recovering water in transport pipes, the water is sucked from the transport pipe through recovery pipes and suction pipes to a water pump and sent directly to other points of use, or once returned to a water tank via return pipes. will be returned to. Even if the transport pipe is located lower than the water tank, the suction power of the water pump will smoothly collect the remaining water, and the collected water will be stored in the water tank and transported to an appropriate location for disposal, or for car washing, etc. It can be used for various purposes.

Not only can you wash your car with the car wash nozzle while collecting water from the transport pipe into the water tank, you can also operate the three-way switching valve to connect the external water source piping to the water tank and drain the water in the water tank. It can also be used to prevent freezing. The water in the water tank can be discharged to the outside at the same time as the water in the transport pipe is recovered.

[Example] Hereinafter, an example of this invention will be described with reference to the drawings.

Fig. 1 shows a water supply system A loaded on a concrete pump vehicle (not shown) for water cleaning work, in which 1 is a water tank mounted on the vehicle, 2
has a piston 4 that reciprocates by a cylinder 3 and an actuator 2a, and check valves 5, 6, 7, and 8 are arranged at each port provided on the piston head side and the rod side of the cylinder 3, respectively. It's a water pump. The suction side of the water pump 2 is connected to the water tank 1 via a suction pipe 9 and a three-way switching valve 10.
and is alternatively connected to external water source piping 11. In addition, a pressure feed pipe 12 is provided on the discharge side of the water pump 2.
A pressure gauge 13 is installed in this pressure feed pipe 12, and a joint 15a such as a flange is connected to a packing pipe 35 for cleaning the transport pipe (see Figs. 3 and 4) via an on-off valve 14. A transport pipe connecting end 15 is connected to the car wash nozzle 17 via an on-off valve 16. The transport pipe connecting end 15 and the suction pipe 9 are connected by a recovery pipe 20 having a recovery shutoff valve 18 and an in-line strainer 19. The pressure feed pipe 12 and the water tank 1 are connected by a return pipe 22 equipped with a return valve 21.

Next, the operation of the concrete pump transport pipe cleaning device configured as described above will be described.

When the concrete pumping is finished, the base end 33a of the transport pipe 33 is separated from the concrete pump as in the conventional case, the stuffing pipe 35 with the stuffing 34 inside is attached, and the other end 35a of the stuffing pipe 35 is connected to the water supply device. Connect the transport pipe connection end 15 of A. and,
The three-way switching valve 10 is connected to the water tank 1, the on-off valve 14 at the transport pipe connection end 15 is opened, the on-off valve 16 of the car wash nozzle 17, the recovery shutoff valve 18 and the return valve 21 are closed, and the water pump 2 is turned on by the actuator 2a. operate. Then, as the piston 4 moves, the water in the water tank 1 flows through the three-way switching valve 10, the suction pipe 9, the check valves 5 and 6, the cylinder 3, the check valves 7 and 8, and the pressure pipe 1.
2. The stuffing material 34 is fed into the stuffing pipe 35 through the on-off valve 14 and the transport pipe connection end 15, and the stuffing material 34 is fed into the stuffing pipe 35.
The remaining ready-mixed concrete inside the transport pipe 33 is pushed out from the other end 33b on the casting site side and removed.

In addition, in the above, water tank 1 is used as the water source.
However, if an external water source is used, the three-way switching valve 10 may be switched to the external water source piping 11.

Next, when recovering the water in the transport pipe 33 and using it for car washing, the three-way switching valve 10 is switched to the closed side, and the on-off valve 14 at the transport pipe connection end 15 and the return valve 21 are closed.
is closed, the on-off valve 16 of the car wash nozzle 17 and the recovery cut-off valve 18 are opened, and the water pump 2 is operated again. The water inside the transport pipe 33 passes through the stuffing pipe 35 and the transport pipe connection end 15, flows into the recovery pipe 20, is filtered by an in-line strainer 19 to remove dust, and is passed from the suction pipe 9 to the check valve 5. , 6, the cylinder 3, the check valves 7 and 8, the pressure feed pipe 12, and the on-off valve 16 to be fed to the car wash nozzle 17.

In this case, it is necessary to treat the base end 33a depending on the state of inclination of the transport pipe 33. That is, when the other end 33b of the transport tube 33 is inclined so as to be above the base end 33a, the stuffing 3
4 will not leak out from the other end 33b, so the load on the water pump 2 can be reduced by removing the stuffing 34. On the other hand, is the transport pipe 33 horizontal?
Alternatively, if the other end 33b is inclined so that it is lower than the base end 33a, the water inside will flow out when the stuffing 34 is removed, so the load on the water pump 2 will be higher, but the stuffing 34 can be attached. Collect the items as they are. Therefore, if possible, it is preferable to collect with the other end 33b facing up.

In addition, when returning the water in the transport pipe 33 to the water tank 1, the three-way switching valve 10 is closed, and the on-off valve 14 of the transport pipe connection end 15 and the on-off valve 16 of the car wash nozzle 17 are closed.
is closed, the recovery shutoff valve 18 and the return valve 21 are opened, and the water pump 2 is operated. Then, the water in the transport pipe 33 is transferred to the filling pipe 35, the transport pipe connection end 15, the recovery pipe 20, the in-line strainer 19, the suction pipe 9, the check valves 5 and 6, the cylinder 3, and the check valves 7 and 8. ,
It flows into the water tank 1 through the pressure feed pipe 12, the return valve 21, and the return pipe 22.Furthermore, when it becomes necessary to empty the water tank 1 to prevent freezing, operate the three-way switching valve 10. Connect external water source piping 11 to water tank 1,
The water in the water tank 1 is discharged to the outside through the pipe 11. This drainage is carried out by discharging the water in the transport pipe 33 into the water tank 1.
You can also do this while collecting it.

In addition, when transferring water from an external water source to a water tank, the three-way switching valve 10 is connected to the external water source piping 11.
Switch to the side, on-off valves 14, 16, recovery cut-off valve 1
8 is closed, the return valve 21 is opened, and the water pump 2 is operated.

[Effects of the invention] As detailed above, this invention has a water tank, and the water in the water tank is sucked through a suction pipe having a three-way switching valve, and is transferred to concrete through a pressure pipe having a first on-off valve. A water pump that supplies water to the transport pipe, and a recovery shutoff valve and a strainer are provided between the transport pipe and the suction pipe, and the water in the transport pipe is sucked by the water pump and sent back. recovery piping is provided with one end connected to the piping between the transport pipe and the first on-off valve, and the other end connected to the suction piping between the three-way switching valve and the water pump, and the pressure feeding piping Between the water tank and the water tank, there is a return pipe that has a return valve and returns the water sent back to the water tank.
One end thereof is connected to a pressure feed pipe between the first on-off valve and the water pump, and an external water source pipe is connected to the three-way switching valve, and the pressure feed pipe has a second on-off valve. Since the car wash nozzle is configured to be connected between the first on-off valve and the water pump, the water used for washing the transport pipe is forcibly recovered by the water pump, so that the water can be quickly removed. It can be easily recovered and returned to the water tank if necessary. Therefore, water from a small water source can be used effectively, and the waste water used for cleaning can be transported to a predetermined location, thereby preventing it from becoming a source of pollution. Further, since the water tank may be located higher than the transport pipe, there is no restriction on the position of the water tank, and it can be installed, for example, at a high location on a concrete pump vehicle. Furthermore, it is also possible to wash the car with a car wash nozzle and drain the water in the water tank to the outside using external water source piping to prevent freezing, but one or both of these car washing and drainage operations are carried out by transportation. Since the work can be carried out while recovering the water in the pipe, it has excellent effects such as being able to finish the work efficiently and quickly.

[Brief explanation of drawings]

Figure 1 is a diagram of a portion of a water conveyance system according to an embodiment of this invention, Figure 2 is a diagram of a conventional water conveyance system, and Figures 3 and 4 are diagrams showing a method for removing residual concrete from transport pipes. It is. 1...Water tank, 2...Water pump, 9...Suction piping, 12...Pressure piping, 20...Recovery piping, 2
1...Return valve, 22...Return pipe, 33...Transport pipe.

Claims (1)

[Scope of utility model registration request] A water tank 1 and a water pump 2 that sucks water from the water tank 1 through a suction pipe 9 having a three-way switching valve 10 and supplies it to a concrete transport pipe 33 through a pressure feed pipe 12 having a first on-off valve 14. and
A collection shutoff valve 18 and a strainer 19 are provided between the transport pipe 33 and the suction pipe 9.
A recovery piping 20 for sucking and returning water in water pump 2 has one end connected to the piping between the transport pipe 33 and the first on-off valve 14, and the other end connected to the three-way switching valve 10. A return valve 21 is provided between the pressure feeding pipe 12 and the water tank 1 to return the water sent back to the water tank 1. The piping 22 is
One end thereof is connected to the pressure feed pipe 12 between the first on-off valve 14 and the water pump 2, and an external water source pipe 11 is connected to the three-way switching valve 10. A transport pipe cleaning device for a concrete pump, characterized in that a car wash nozzle 17 having a second on-off valve 16 is connected between the first on-off valve 14 and the water pump 2.