A connection method and construction method for a mud and water bypass device of a micro pipe jacking machine

Abstract

The present invention relates to the technical field of construction equipment, and specifically to a connection method and a construction method for a mud and water bypass device of a micro pipe jacking machine. A water inlet pipeline and a water outlet pipeline are arranged at the lower side of a mud and water bin of the pipe jacking machine, a first four-way valve is arranged in the water inlet pipeline, and a second four-way valve is arranged in the water outlet pipeline. The first four-way valve has a first water inlet, a first water outlet, a pressurized opening and a first connecting opening. The pressurized opening is connected to the mud and water bin of the pipe jacking machine through a pressurized pipeline, and a booster valve is arranged at the pressurized pipeline. The second four-way valve has a second water inlet A, a second water inlet B, a second water outlet and a second connecting opening. The present invention helps to reduce the structural size of the device and save space inside the machine; improve the versatility and adaptability of the device, and is reliable in use, reduces manual labor, reduces occupational hazards, has a simple structure, and adopts a four-way ball valve to replace the switching of three circuits of mud inlet and discharge mode, bypass mode and flushing mode, thereby greatly reducing the structural size of the device.

Description

Technical Field

[0001] The invention relates to the technical field of construction equipment, in particular to a connection method and a construction method for a mud and water bypass device of a micro pipe jacking machine. Background Art

[0002] The internal bypass device of the mud-water type pipe jacking machine is a mud-water distribution device composed of valves and pipes, which is placed inside the pipe jacking machine, connected to the mud-water bin of the pipe jacking machine in front and the mud discharge pipeline in the back. It has the function of circulating mud-water and bypassing flow. During normal excavation work, it plays a transitional role in the circulation of mud in and out. In the bypass circulation state, the mud discharge pipeline can be flushed to avoid pipeline blockage. Therefore, the internal bypass device plays a very important role in pipe jacking construction.

[0003] The water stop device of the traditional pipe jacking machine is mainly composed of an inlet valve, a drain valve and a bypass valve. The mud inlet and discharge valve and the bypass valve each require an actuator. The installation size of the entire bypass device is relatively large and the structure is complex. Due to the limited space inside the micro pipe jacking machine, the huge size of the traditional bypass device is not applicable, and the complex execution structure reduces the reliability of the device. In addition, the water inlet valve, pipeline and mud discharge valve pipeline have the same diameter. The water inlet pressure is affected by the resistance loss along the way and the local pressure loss. When the pipeline flows to the mud and water bin, the pressure loss is too large, and the flushing ability of the cutter disc and the mud residue in the mud and water bin and the cutting material on the tunnel face is weak, especially in the hard clay layer, which is very easy to produce the phenomenon of "sticky cutter disc", greatly affecting the efficiency of excavation construction.

[0004] At present, a special valve body is also used to integrate the water inlet valve and the mud discharge valve into a whole to reduce the structural size. However, the manufacturing process of the special valve body is complicated and cannot be disassembled. Once the inside of the valve body is blocked, it is difficult to clean. In addition, the special valve body is a non-standard part and the damaged parts can only be replaced as a whole, which reduces the fluidity and adaptability of the product and does not conform to the concept of green and environmentally friendly sustainable development. Summary of the invention

[0005] The purpose of the present invention is to solve the deficiencies of the prior art and provide a connection method for a mud and water bypass device of a micro pipe jacking machine, which helps to reduce the structural size of the device and save space inside the machine.

[0006] In order to achieve the above-mentioned purpose, a connection method for a mud and water bypass device of a micro pipe jacking machine is designed, which is characterized in that a water inlet pipeline and a water outlet pipeline are provided on the lower side of the mud and water bin of the pipe jacking machine, a first four-way valve is provided in the water inlet pipeline, and a second four-way valve is provided in the water outlet pipeline.

[0007] Among them, the first four-way valve has a first water inlet, a first water outlet, a pressurized opening and a first connecting opening, so that the first water inlet is connected to the upstream side of the water inlet pipeline, the first water outlet is connected to the downstream side of the water inlet pipeline, the pressurized opening is connected to the mud and water bin of the jacking machine through the pressurized pipeline, and a boosting valve is arranged at the pressurized pipeline to connect the first connecting opening with the second four-way valve.

[0008] The second four-way valve has a second water inlet A, a second water inlet B, a second water outlet and a second connecting opening, so that the second water inlet A and the second water inlet B are connected to the upstream side of the water outlet pipe, the second water outlet is connected to the downstream side of the water outlet pipe, and the second connecting opening is connected to the first four-way valve.

[0009] A double-link mechanism is also provided to control the first four-way valve and the second four-way valve. The double-link mechanism includes a power push rod, on which a first connecting rod and a second connecting rod are rotatably connected, and the first connecting rod is rotatably connected to the first valve handle of the first four-way valve, and the second connecting rod is rotatably connected to the second valve handle of the second four-way valve.

[0010] One end of the first connecting rod is rotatably connected to one end of the second connecting rod on the power push rod, and the other end of the first connecting rod is rotatably connected to the outer end of the first valve handle of the first four-way valve, and the other end of the second connecting rod is rotatably connected to the outer end of the second valve handle of the second four-way valve.

[0011] The pressurized opening is connected to a 90-degree elbow and then to a pressure boosting valve, and is connected to the mud and water bin of the pipe jacking machine through the pressure boosting valve.

[0012] The second water inlet B is connected to the upstream side of the water outlet pipeline through a 180-degree elbow.

[0013] The present invention also relates to a construction method of a mud and water bypass device of a micro pipe jacking machine, and the construction method comprises the following steps: trial operation of the mud and water bypass device; before the cutter disc is started, the mud and water bypass device performs mud and water bypass circulation in the bypass mode; the mud and water bypass device is switched to the mud inlet and discharge mode, the bypass channel is closed, the mud inlet and discharge pipelines are connected to the mud and water bin of the pipe jacking machine, and the cutter disc is started to perform mud and water excavation construction; for complex formations, the high-pressure flushing mode is switched to the high-pressure flushing mode, and the incoming water flows through the pressure boosting valve to perform high-pressure flushing on the cutter disc; at the end of the excavation work, after the cutter disc stops, the bypass device is switched to the bypass mode, the bypass water circulation is performed, and the pipeline is flushed; after ensuring that the water outlet of the mud discharge port is clear, all work is ended in the bypass mode.

[0014] In the mud inlet and discharge circulation mode, the inlet water flows through the first water inlet and the first water outlet and then enters the mud and water bin of the pipe jacking machine, and the outlet water flows out through the second water inlet A and the second water outlet; the power push rod of the double mechanism drives the valve handle to rotate to switch to the bypass mode to realize the bypass circulation. At this time, the first water outlet and the second water inlet A are closed, and the water inlet pipeline and the drainage pipeline are directly connected through the first connecting opening, the connecting pipeline, and the second connecting opening. Clean water circulates through the mud discharge pipeline to take away obstacles and sediment in the mud discharge pipeline to realize pipeline flushing; the power push rod of the double mechanism drives the valve handle to rotate to switch to the high-pressure flushing mode. At this time, the first connecting opening and the second connecting opening are closed, the water inlet pipeline is directly connected to the pressurized pipeline through the pressurized opening, the inlet water flows into the pressurized valve to generate a high-pressure jet, and the cutter disc is flushed through the high-pressure nozzle, and the outlet water flows through the second water inlet B and is discharged.

[0015] Advantageous Effects of the Invention

[0016] Compared with the prior art, the present invention provides a connection method for a mud and water bypass device for a micro pipe jacking machine, which helps to reduce the structural size of the device and save space inside the machine; improves the versatility and adaptability of the device, is reliable in use, reduces manual labor, reduces occupational hazards, has a simple structure, and uses a four-way ball valve to replace the switching of three circuits of mud inlet and outlet mode, bypass mode and flushing mode, which greatly reduces the structural size of the device. It also has the following advantages:

[0017] 1. The number of actuators is reduced, and three actuators are reduced to one double-link mechanism, which improves the reliability of the mechanism and reduces the overall structural size of the device.

[0018] 2. Threaded connection is used to replace flange connection and Haversian connection, which has reliable connection, small connection size and convenient replacement of wearing parts.

[0019] 3. The full-flow four-way valve is used to reduce the local pressure loss of water pressure and improve the slag discharge capacity of mud-water circulation.

[0020] 4. The integrated installation reduces the workload of operators.

[0021] 5. The bypass cycle is easy to operate, reducing the operating requirements for the tunnel boring machine driver. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention in the state of mud intake and discharge circulation.

[0023] Figure 2 It is a schematic diagram of the structure of the present invention in the bypass circulation state.

[0024] Figure 3 It is a schematic diagram of the structure of the present invention in a high-pressure flushing state.

[0025] Figure 4 It is a schematic diagram of the conduction state of the first four-way valve and the second four-way valve of the present invention.

[0026] In the figure: 1. Mud and water bin of pipe jacking machine 2. 180 degree elbow 3. Four-way ball valve 4. Pressurized air valve 5. 90 degree elbow 6. Special short wire 7. Double mechanism 8. Power push rod 9. Second water inlet A 10. Second connecting opening 11. Second water inlet B 12. Second water outlet 13. First water inlet 14. First connecting opening 15. Pressurized opening 16. First water outlet. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings, and the structure and principle of this method are very clear to people in the field. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] The present embodiment provides a mud and water bypass device for a micro pipe jacking machine, comprising a mud and water bin of the pipe jacking machine, a water inlet pipeline and a water outlet pipeline are arranged at the lower side of the mud and water bin of the pipe jacking machine, a first four-way valve is arranged in the water inlet pipeline, and a second four-way valve is arranged in the water outlet pipeline, wherein the first four-way valve has a first water inlet, a first water outlet, a pressurized opening and a first connecting opening, the first water inlet is connected to the upstream side of the water inlet pipeline, the first water outlet is connected to the downstream side of the water inlet pipeline, the pressurized opening is connected to the mud and water bin of the pipe jacking machine through the pressurized pipeline, and a boosting valve is arranged at the pressurized pipeline, the first connecting opening is connected to the second four-way valve; the second four-way valve has a second water inlet A, a second water inlet B, a second water outlet and a second connecting opening, the second water inlet A and the second water inlet B are connected to the upstream side of the water outlet pipeline, the second water outlet is connected to the downstream side of the water outlet pipeline, and the second connecting opening is connected to the first four-way valve.

[0029] See also Figure 1Specifically, in this embodiment, the first four-way valve is connected in a vertical pipe of the water inlet pipeline, the part of the water inlet pipeline located at the lower side of the first four-way valve is the upstream side, and the part located at the upper side of the first four-way valve is the downstream side. The incoming water can flow through the first four-way valve and then flow into the mud and water bin of the pipe jacking machine. The lower opening of the first four-way valve is the first water inlet, the upper opening is the first water outlet, the left opening is the pressurized opening, and the right opening is the first connecting opening. The pressurized opening on the left is connected to a 90-degree elbow and then connected to the boosting valve, and is connected to the mud and water bin of the pipe jacking machine through the boosting valve. The second four-way valve is connected to the vertical pipe of the water outlet pipeline. The part of the water outlet pipeline located on the upper side of the second four-way valve is the upstream side, and the part located on the lower side of the second four-way valve is the downstream side. The water can flow through the second four-way valve and continue to be discharged through the water outlet pipeline. The upper opening of the second four-way valve is the second water inlet A, the right opening is the second water inlet B, the lower opening is the second water outlet, and the left opening is the second connecting opening. The second water inlet B is connected to the upstream side of the water outlet pipeline through a 180-degree elbow. The first connecting opening and the second connecting opening are connected through a connecting pipeline. And preferably, the first four-way valve is connected to the water inlet pipeline, the pressurized pipeline and the connecting pipeline through a threaded connection, and the second four-way valve is connected to the water outlet pipeline, the connecting pipeline and the 180-degree elbow through a threaded connection.

[0030] Furthermore, the first four-way valve and the second four-way valve are controlled by a double-link mechanism to realize opening and closing regulation, and the double-link mechanism includes a power push rod, the upper end of which is connected to the lower end of the first connecting rod and the lower end of the second connecting rod by a rotational connection, such as hinge, and the lower end of the power push rod is fixed to the water inlet pipeline or the water outlet pipeline, one end of the first connecting rod and one end of the second connecting rod, and at the same time, the upper end of the first connecting rod is rotationally connected to the outer end of the first valve handle of the first four-way valve, and the upper end of the second connecting rod is rotationally connected to the outer end of the second valve handle of the second four-way valve. Thus, the valve handles of the two four-way valves are driven to rotate by the power push rod, and the passages of the two four-way valves are switched.

[0031] Embodiment 1

[0032] The mud and water bypass device for the micro pipe jacking machine in this embodiment mainly includes two four-way ball valves, a special short wire, a double mechanism, a boost valve and a power push rod. The double mechanism drives the handle of the four-way ball valve to rotate to realize the switching of the three modes of mud inlet and outlet, bypass circulation and high-pressure flushing of the four-way ball valve. The boost valve can be a pneumatic boost valve or a hydraulic boost valve, etc.

[0033] Among them, the four-way ball valve preferably adopts a full-flow four-way ball valve. The interface of the full-flow four-way ball valve adopts a threaded connection instead of a traditional flange connection or a Havers connection. While meeting the pipeline sealing requirements, it does not increase the size of the connecting component and meets the space size requirements of the micro-jacking pipe. At the same time, compared with the non-detachable nature of welding, it has the characteristics of easy installation and disassembly.

[0034] Special short threads are used as connecting pipes. They are external thread and internal channel structures. The external thread interface is used to connect two full-flow four-way ball valves into an assembly. The internal channel is used as a pipe to connect the inlet and outlet pipes to achieve bypass water circulation. The use of special short threads and full-flow four-way ball valve structures reduces the use of a separate bypass valve and reduces the structural size of the overall device.

[0035] The double linkage mechanism is a connecting rod mechanism. Through the extension and retraction of the power push rod, the valve handle (crank) of the connecting rod mechanism is driven to rotate, and the valve core rotates to achieve the reversing adjustment of the ball valve within a range of 270 degrees. The actuator is a double linkage, which switches the two four-way ball valves at the same time. There are 3 connecting rod node positions to ensure the safety of switching between the three modes of mud and water circulation, bypass circulation and high-pressure flushing, and prevent the occurrence of "pipe burst" phenomenon.

[0036] The power push rod adopts a DC electric push rod. The tailstock of the DC electric push rod is fixed to the overall structure. For example, it can be fixed in a tunnel boring machine. The actuator is driven to move by the extension of the electric rod. The correspondence between the stroke of the push rod and the angle of the valve core reversal is determined in advance through calculation or actual testing, and the position of the required stroke is used as the stroke limit of the electric push rod. A limiter is installed on the push rod accordingly to ensure reliable movement. The DC electric push rod is small in size, easy to install, highly controllable, and runs smoothly.

[0037] The following combination Figure 4 , explain the switching of the three modes of mud inlet and outlet circulation, bypass circulation and high-pressure flushing: see Figure 1 The four-way ball valve plays a transitional role between the mud and water bin and the water inlet and outlet pipelines, meeting the opening and closing function of the mud and water valve during normal excavation construction. In the mud inlet and outlet circulation mode, the inlet water flows through the first water inlet and the first water outlet and then enters the mud and water bin of the pipe jacking machine, and the outlet water flows out through the second water inlet A and the second water outlet. At this time, the double-link mechanism and the valve handle are roughly V-shaped; combined with Figure 2 When the flow in the pipeline is not smooth, the power push rod of the double-link mechanism drives the valve handle to rotate to switch to the bypass mode to realize the bypass cycle. The first water outlet and the second water inlet A are closed, and the water inlet pipeline and the drainage pipeline are directly connected through the first connecting opening, the connecting pipeline, and the second connecting opening. Clean water circulates in the mud discharge pipeline to take away obstacles and sediments in the mud discharge pipeline to realize pipeline flushing. At this time, the double-link mechanism and the valve handle are roughly T-shaped; combined with Figure 3When encountering hard clay layers or complex formations and needing to flush the cutter disc, the power push rod of the double-link mechanism drives the valve handle to rotate to switch to the high-pressure flushing mode, the first connecting opening and the second connecting opening are closed, and the water inlet pipeline is directly connected to the pressurized pipeline through the pressurized opening. The inlet water flows into the pressurized valve to generate a high-pressure jet, and the cutter disc is flushed through the high-pressure nozzle. The outlet water flows through the second water inlet B and is discharged. At this time, the double-link mechanism and the valve handle are roughly M-shaped.

[0038] Embodiment 2

[0039] The construction method of this bypass device is as follows:

[0040] 1. Construction preparation.

[0041] 2. Carry out test operation of the combined bypass device.

[0042] 3. Before the cutter disc is started, the combined bypass device performs mud and water bypass circulation in bypass mode.

[0043] 4. After the mud and water circulation is normal, switch the bypass to the mud inlet and discharge mode, close the bypass channel, connect the mud inlet and discharge pipelines to the mud and water bin, and start the cutter head for normal mud and water excavation construction.

[0044] 5. When encountering complex formations such as hard clay layers, switch to high-pressure flushing mode. The incoming water flows through the pressurized air bag to perform high-pressure flushing on the cutter disc, realizing mud and water circulation in this mode.

[0045] 6. At the end of the excavation work, after the cutterhead stops rotating, the bypass device switches to the bypass mode to circulate bypass water and flush the pipeline.

[0046] 6. After ensuring that the water from the mud outlet is clear, complete all work in bypass mode.

[0047] 7. After the jacking pipe is penetrated, the bypass device should be maintained in time and wait for the next construction use.

Claims

1. A method for connecting a muddy water bypass device for a micro pipe jacking machine, characterized in that A water inlet pipeline and a water outlet pipeline are provided at the lower side of the mud and water bin of the pipe jacking machine, a first four-way valve is provided in the water inlet pipeline, and a second four-way valve is provided in the water outlet pipeline; Wherein, the first four-way valve has a first water inlet, a first water outlet, a pressurized opening and a first connecting opening, so that the first water inlet is connected to the upstream side of the water inlet pipeline, the first water outlet is connected to the downstream side of the water inlet pipeline, the pressurized opening is connected to the mud and water tank of the pipe jacking machine through the pressurized pipeline, and a booster valve is arranged at the pressurized pipeline to connect the first connecting opening with the second four-way valve; The second four-way valve has a second water inlet A, a second water inlet B, a second water outlet and a second connecting opening, so that the second water inlet A and the second water inlet B are connected to the upstream side of the water outlet pipeline, the second water outlet is connected to the downstream side of the water outlet pipeline, and the second connecting opening is connected to the first four-way valve; A double-link mechanism is also provided to control the first four-way valve and the second four-way valve. The double-link mechanism includes a power push rod, on which a first connecting rod and a second connecting rod are rotatably connected, and the first connecting rod is rotatably connected to the first valve handle of the first four-way valve, and the second connecting rod is rotatably connected to the second valve handle of the second four-way valve.

2. A method for connecting a muddy water bypass device for a micro pipe jacking machine as claimed in claim 1, characterized in that One end of the first connecting rod is rotatably connected to one end of the second connecting rod on the power push rod, and the other end of the first connecting rod is rotatably connected to the outer end of the first valve handle of the first four-way valve, and the other end of the second connecting rod is rotatably connected to the outer end of the second valve handle of the second four-way valve.

3. A method for connecting a muddy water bypass device for a micro pipe jacking machine as claimed in claim 1, characterized in that The pressurized opening is connected to a 90-degree elbow and then to a pressure boosting valve, and is connected to the mud and water bin of the pipe jacking machine through the pressure boosting valve.

4. A method for connecting a muddy water bypass device for a micro pipe jacking machine as claimed in claim 1, characterized in that The second water inlet B is connected to the upstream side of the water outlet pipeline through a 180-degree elbow.

5. A construction method for a muddy water bypass device of a micro pipe jacking machine obtained by the connection method according to claim 1, characterized in that The construction method comprises the following steps: Conduct trial operation of the mud and water bypass device; Before the cutter disc is started, the mud and water bypass device performs mud and water bypass circulation in bypass mode; Switch the mud and water bypass device to the mud inlet and outlet mode, close the bypass channel, connect the mud inlet and outlet pipelines to the mud and water bin of the pipe jacking machine, and start the cutterhead to carry out mud and water excavation construction; For complex formations, switch to high-pressure flushing mode, and the water flows through the pressure valve to perform high-pressure flushing on the cutterhead; At the end of the excavation work, after the cutterhead stops rotating, the bypass device is switched to the bypass mode to circulate bypass water and flush the pipeline; After ensuring that the water from the mud outlet is clear, complete all work in bypass mode.

6. The construction method according to claim 5, characterized in that The method described is as follows: In the mud inlet and outlet circulation mode, the inlet water flows through the first water inlet and the first water outlet and then enters the mud and water tank of the pipe jacking machine, and the outlet water flows out through the second water inlet A and the second water outlet; The power push rod of the double-link mechanism drives the valve handle to rotate to switch to the bypass mode to realize the bypass cycle. At this time, the first water outlet and the second water inlet A are closed, and the water inlet pipeline and the drainage pipeline are directly connected through the first connecting opening, the connecting pipeline, and the second connecting opening. Clean water circulates in the mud discharge pipeline to remove obstacles and sediments in the mud discharge pipeline, thereby realizing pipeline flushing; The power push rod of the double mechanism drives the valve handle to rotate to switch to the high-pressure flushing mode. At this time, the first connecting opening and the second connecting opening are closed, and the water inlet pipe is directly connected to the pressurized pipe through the pressurized opening. The incoming water flows into the pressurized valve to generate a high-pressure jet, which flushes the cutter disc through the high-pressure nozzle, and the outlet water flows through the second water inlet B and is discharged.

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