A mud bypass device for a micro pipe jacking machine

Abstract

The present invention relates to the technical field of construction equipment, and specifically relates to a mud bypass device for a micro pipe jacking machine. An inlet water pipeline and an outlet water pipeline are provided on the lower side of the mud sump of the pipe jacking machine. A first four-way valve is provided in the inlet water pipeline, and a second four-way valve is provided in the outlet water pipeline. The first four-way valve has a first water inlet, a first water outlet, a pressurization opening, and a first connection opening. The pressurization opening is communicated with the mud sump of the pipe jacking machine through a pressurization pipeline, and a booster valve is provided at the pressurization pipeline. The second four-way valve has a second water inlet A, a second water inlet B, a second water outlet, and a second connection opening. The present invention helps to reduce the structural size of the device, save the internal space of the machine; improve the versatility and adaptability of the device, reduce the manual labor amount with reliable use, reduce the occupational hazards, and has a simple structure. The four-way ball valve is used to replace the switching of three circuits of the mud inlet and outlet mode, the bypass mode, and the flushing mode, greatly reducing the structural size of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of construction equipment, and more specifically to a mud bypass device for a micro pipe jacking machine. Background Art

[0002] The in-machine bypass device of a slurry pipe jacking machine is a slurry distribution device composed of valves and pipes, which is placed inside the pipe jacking machine, connected to the slurry chamber of the pipe jacking machine at the front and to the mud discharge pipeline at the rear. It has the function of making the slurry circulate and flow bypass. During normal tunneling work, it plays a transitional role in the intake and discharge of slurry circulation. In the bypass circulation state, it can wash the mud discharge pipeline to avoid pipeline blockage. Therefore, the in-machine bypass device plays a very important role in pipe jacking construction.

[0003] The water stop device of a traditional pipe jacking machine mainly consists of an intake valve, a discharge valve, and a bypass valve. Each of the intake and discharge valves and the bypass valve requires an actuator. The overall installation size of the bypass device is relatively large, and the structure is complex. Due to the limited space inside the micro pipe jacking machine, the large volume of the traditional bypass device is not applicable, and the complex actuator structure reduces the reliability of the device. Moreover, the diameters of the intake valve, pipeline, and discharge valve pipeline are the same. Affected by the frictional resistance loss and local pressure loss along the way, when the pipeline flows into the slurry chamber, the pressure loss is too large, and the ability to wash the mud and slag in the cutter head and slurry chamber and the cuttings of the working face is weak. Especially in hard clay layers, the phenomenon of "sticking cutter head" is extremely likely to occur, which greatly affects the tunneling construction efficiency.

[0004] Currently, there is also a special valve body that integrates the intake valve and the discharge valve into one unit to reduce the structural size. However, the manufacturing process of the special valve body is complex and it cannot be disassembled. Once the inside of the valve body becomes blocked, it is difficult to clean. Moreover, the special valve body is a non-standard part, and when a component is damaged, it can only be replaced as a whole, which reduces the circulation and adaptability of the product and does not conform to the concept of sustainable development of green environmental protection. Summary of the Invention

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

[0006] To achieve the above object, a muddy water bypass device for a micro pipe jacking machine is designed, including the muddy water bin of the pipe jacking machine. An inlet water pipe and an outlet water pipe are provided on the lower side of the muddy water bin of the pipe jacking machine. A first four-way valve is provided in the inlet water pipe, and a second four-way valve is provided in the outlet water pipe. Among them, the first four-way valve has a first water inlet, a first water outlet, a pressurizing opening, and a first connection opening. The first water inlet is communicated with the upstream side of the inlet water pipe, the first water outlet is communicated with the downstream side of the inlet water pipe, the pressurizing opening is communicated with the muddy water bin of the pipe jacking machine through a pressurizing pipeline, and a pressure increasing valve is provided at the pressurizing pipeline. The first connection opening is communicated 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 connection opening. The second water inlet A and the second water inlet B are communicated with the upstream side of the outlet water pipe, the second water outlet is communicated with the downstream side of the outlet water pipe, and the second connection opening is communicated with the first four-way valve.

[0007] The first four-way valve and the second four-way valve are controlled by a double-link mechanism. The double-link mechanism includes a power push rod. A first connecting rod and a second connecting rod are rotatably connected to the power push rod. At the same time, 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.

[0008] One end of the first connecting rod and one end of the second connecting rod are rotatably connected to the power push rod. At the same time, 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.

[0009] The upper end of the power push rod is rotatably connected to the first connecting rod and the second connecting rod, and the lower end of the power push rod is fixed to the inlet water pipe or the outlet water pipe.

[0010] The lower side opening of the first four-way valve is the first water inlet, the upper side opening is the first water outlet, the left side opening is the pressurizing opening, and the right side opening is the first connection opening.

[0011] The pressurizing opening is connected to a 90-degree elbow and then connected to the pressure increasing valve, and is communicated with the muddy water bin of the pipe jacking machine through the pressure increasing valve.

[0012] The upper side opening of the second four-way valve is the second water inlet A, the right side opening is the second water inlet B, the lower side opening is the second water outlet, and the left side opening is the second connection opening.

[0013] The second water inlet B is communicated with the upstream side of the outlet water pipe through a 180-degree elbow.

[0014] The first connection opening and the second connection opening are connected and communicated through a connecting pipeline.

[0015] The first four-way valve is connected to the water inlet pipeline, the pressurizing pipeline and the connecting pipeline through threaded connection. The second four-way valve is connected to the water outlet pipeline, the connecting pipeline and the 180-degree elbow through threaded connection.

[0016] Advantages of the Invention

[0017] Compared with the prior art, the combined structure of the present invention is simple and feasible, easy to install and disassemble. It provides a simple combined bypass device, which helps to reduce the structural size of the device, save the internal space of the machine, improve the versatility and adaptability of the device, reduce the manual labor and occupational hazards with reliable use. The structure is simple. A four-way ball valve is used to replace the switching of three circuits: the sludge inlet and outlet mode, the bypass mode and the flushing mode, greatly reducing the structural size of the device. It also has the following advantages:

[0018] 1. The number of actuators is reduced. Three actuators are reduced to a double-link mechanism, improving the reliability of the mechanism and reducing the overall structural size of the device.

[0019] 2. Threaded connection is used to replace flange connection and half-coupling connection, with reliable connection, small connection size and convenient replacement of vulnerable parts.

[0020] 3. A full-flow four-way valve is adopted, reducing the local pressure loss of water pressure and improving the slag removal ability of the mud water circulation.

[0021] 4. Integrated installation is adopted, reducing the working intensity of operators.

[0022] 5. The bypass cycle operation is simple, reducing the operation requirements for the roadheader driver. Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of the present invention in the sludge inlet and outlet circulation state.

[0024] Figure 2 is a schematic structural diagram of the present invention in the bypass circulation state.

[0025] Figure 3 is a schematic structural diagram of the present invention in the high-pressure flushing state.

[0026] Figure 4 is a schematic diagram of the conduction state of the first four-way valve and the second four-way valve of the present invention.

[0027] In the figure: 1. Slurry chamber of pipe jacking machine; 2. 180-degree elbow; 3. Four-way ball valve; 4. Pressurizing air valve; 5. 90-degree elbow; 6. Special short thread; 7. Double-link mechanism; 8. Power push rod; 9. Second water inlet A; 10. Second connection opening; 11. Second water inlet B; 12. Second water outlet; 13. First water inlet; 14. First connection opening; 15. Pressurizing opening; 16. First water outlet. Detailed implementation mode

[0028] The present invention will be further described below in conjunction with the accompanying drawings. The structure and principle of this device are very clear to those skilled in the art. 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.

[0029] This implementation mode provides a slurry bypass device for a micro pipe jacking machine, including a slurry chamber of the pipe jacking machine. An inlet pipeline and an outlet pipeline are provided on the lower side of the slurry chamber of the pipe jacking machine. A first four-way valve is provided in the inlet pipeline, and a second four-way valve is provided in the outlet pipeline. Among them, the first four-way valve has a first water inlet, a first water outlet, a pressurizing opening and a first connection opening. The first water inlet is communicated with the upstream side of the inlet pipeline, the first water outlet is communicated with the downstream side of the inlet pipeline, the pressurizing opening is communicated with the slurry chamber of the pipe jacking machine through a pressurizing pipeline, and a pressure increasing valve is provided at the pressurizing pipeline. The first connection opening is communicated 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 connection opening. The second water inlet A and the second water inlet B are communicated with the upstream side of the outlet pipeline, the second water outlet is communicated with the downstream side of the outlet pipeline, and the second connection opening is communicated with the first four-way valve.

[0030] See Figure 1, specifically, in this embodiment, the first four-way valve is connected to the vertical pipeline of the water inlet pipeline. The part of the water inlet pipeline below the first four-way valve is the upstream side, and the part above the first four-way valve is the downstream side. The water inlet can flow through the first four-way valve and then into the slurry chamber 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 pressurizing opening, and the right opening is the first connection opening. The pressurizing opening on the left is connected to a 90-degree elbow and then to a booster valve, and is communicated to the slurry chamber of the pipe jacking machine through the booster valve. The second four-way valve is connected to the vertical pipeline of the water outlet pipeline. The part of the water outlet pipeline above the second four-way valve is the upstream side, and the part below the second four-way valve is the downstream side. The water outlet can flow through the second four-way valve and then 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 connection opening. The second water inlet B is communicated to the upstream side of the water outlet pipeline through a 180-degree elbow. Between the first connection opening and the second connection opening, they are connected through a connecting pipeline. And preferably, the first four-way valve is connected to the water inlet pipeline, the pressurizing pipeline and the connecting pipeline by threaded connection, and the second four-way valve is connected to the water outlet pipeline, the connecting pipeline and the 180-degree elbow by threaded connection.

[0031] Moreover, the first four-way valve and the second four-way valve are controlled by a double-link mechanism to achieve opening and closing regulation. The double-link mechanism includes a power push rod. The upper end of the power push rod is connected to the lower ends of the first connecting rod and the second connecting rod in a rotatable manner, such as by hinging. 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. At the same time, the upper 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 upper end of the second connecting rod is rotatably 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 further the switching of the passages of the two four-way valves is realized.

[0032] Embodiment 1

[0033] The slurry bypass device for the micro pipe jacking machine in this embodiment mainly includes two four-way ball valves, a special short thread, a double-link mechanism, a booster valve and a power push rod. By driving the handle of the four-way ball valve to rotate through the double-link mechanism, the switching among the three modes of mud inlet and outlet, bypass circulation and high-pressure flushing of the four-way ball valve is realized. The booster valve can be a pneumatic booster valve or a hydraulic booster valve, etc.

[0034] 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 uses threaded connection to replace the traditional flange connection or half-coupling connection. While meeting the requirements of pipeline sealing, it does not increase the size of the connecting components, meeting the requirements of microtunneling for spatial dimensions. At the same time, compared with the non-detachable nature of welding, it has the characteristics of convenient installation and disassembly.

[0035] The special short thread is used as the connecting pipeline. It has a structure of external thread and internal channel. The external thread interface is used to connect two full-flow four-way ball valves into an assembled body, and the internal channel is used as the pipeline to connect the inlet and outlet water pipes to realize the bypass water circulation. The structure of using the special short thread and the full-flow four-way ball valve reduces the use of a single bypass valve and reduces the overall structure size of the device.

[0036] The double-link mechanism is a link mechanism. Through the telescopic movement of the power push rod, it drives the valve handle (crank) of the link mechanism to rotate, and the rotation of the valve core realizes the commutation adjustment of the ball valve within a range of 270 degrees. The actuator is double-linked, and simultaneously switches the commutation of two four-way ball valves to ensure the safety of the switching among the three modes of mud water circulation, bypass circulation, and high-pressure flushing, and prevent the occurrence of the "pipe burst" phenomenon.

[0037] The power push rod adopts a DC electric push rod. The tail seat of the DC electric push rod is fixed to the overall structure. For example, it can be fixed in the tunneling machine. Through the telescopic movement of the electric rod, it drives the actuator to move. First, determine the corresponding relationship between the stroke of the push rod and the commutation angle of the valve core through calculation or actual test, and use the position of the required stroke as the stroke limit of the electric push rod, and install a limiter on the corresponding position of the push rod to ensure reliable movement. The DC electric push rod has a small volume, simple installation, high controllability, and stable operation.

[0038] The following combines Figure 4 , to illustrate the switching among the three modes of inlet and outlet mud circulation, bypass circulation, and high-pressure flushing: Refer to Figure 1 , the four-way ball valve plays a transitional role between the mud sump and the inlet and outlet water pipes, meeting the opening and closing functions of the mud water valve during normal tunneling construction. In the inlet and outlet mud circulation mode, the incoming water flows through the first water inlet and the first water outlet and then enters the mud sump 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 angle between the double-link mechanism and the valve handle is roughly V-shaped; Combining Figure 2 , when the pipeline flow is not smooth, the valve handle is driven to rotate by the power push rod of the double-link mechanism to switch to the bypass mode to realize the bypass circulation. The first water outlet and the second water inlet A are closed, and the inlet water pipe and the drainage pipe are directly connected through the first connection opening, the connecting pipeline, and the second connection opening to conduct a clean water circulation for the mud discharge pipeline, taking away the obstacles and sediment in the mud discharge pipeline to realize pipeline flushing. At this time, the angle between the double-link mechanism and the valve handle is roughly T-shaped; Combining 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.

[0039] Embodiment 2

[0040] The construction method of this bypass device is as follows:

[0041] 1. Construction preparation.

[0042] 2. Carry out test operation of the combined bypass device.

[0043] 3. Before the cutter disc is started, the combined bypass device performs mud and water bypass circulation in bypass mode.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 6. After ensuring that the water from the mud outlet is clear, complete all work in bypass mode.

[0048] 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 muddy water bypass device for a micro pipe jacking machine, including a muddy water storage bin of the pipe jacking machine. An inlet water pipeline and an outlet water pipeline are arranged on the lower side of the muddy water storage bin of the pipe jacking machine, and it is characterized in that A first four-way valve is provided in the described water inlet pipeline, and a second four-way valve is provided in the water outlet pipeline. The first four-way valve and the second four-way valve are controlled by a double-link mechanism. The double-link mechanism includes a power push rod. A first connecting rod and a second connecting rod are rotatably connected to the power push rod. At the same time, 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; The first four-way valve has a first water inlet, a first water outlet, a pressurization opening, and a first connection opening. The first water inlet is communicated with the upstream side of the water inlet pipeline, the first water outlet is communicated with the downstream side of the water inlet pipeline, the pressurization opening is communicated with the slurry chamber of the pipe jacking machine through a pressurization pipeline, and a booster valve is provided at the pressurization pipeline. The first connection opening is communicated 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 connection opening. The second water inlet A and the second water inlet B are communicated with the upstream side of the water outlet pipeline, the second water outlet is communicated with the downstream side of the water outlet pipeline, and the second connection opening is communicated with the first four-way valve; 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 connection opening; The device further includes three modes: sludge inlet and outlet circulation, bypass circulation, and high-pressure flushing; In the sludge inlet and outlet circulation mode, the influent water flows through the first water inlet and the first water outlet and then enters the slurry chamber of the pipe jacking machine, and the effluent 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 approximately in a V shape; When the pipeline flow is not smooth, the valve handle is driven to rotate by the power push rod of the double-link mechanism to switch to the bypass mode to realize bypass circulation. 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 connection opening, the connecting pipeline, and the second connection opening to perform a clean water circulation on the sludge discharge pipeline to carry away the obstacles and sediment in the sludge discharge pipeline and realize pipeline flushing. At this time, the double-link mechanism and the valve handle are approximately in a T shape; When encountering a hard clay layer or a complex formation and it is necessary to flush the cutter head, the valve handle is driven to rotate by the power push rod of the double-link mechanism to switch to the high-pressure flushing mode. The first connection opening and the second connection opening are closed, the water inlet pipeline is directly connected to the pressurization pipeline through the pressurization opening, the influent water flows into the booster valve to generate a high-pressure jet, and the cutter head is flushed through the high-pressure nozzle. The effluent water flows out after passing through the second water inlet B. At this time, the double-link mechanism and the valve handle are approximately in an M shape.

2. The muddy water bypass device for a micro pipe jacking machine according to claim 1, characterized in that One end of the first connecting rod and one end of the second connecting rod are rotatably connected to the power push rod. At the same time, 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. The mud bypass device for a micro pipe jacking machine according to claim 1, characterized in that 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 pressurization opening, and the right opening is the first connection opening.

4. The mud bypass device for a micro pipe jacking machine according to claim 3, characterized in that The pressurization opening is connected to a 90-degree elbow and then connected to the booster valve, and is communicated to the slurry chamber of the pipe jacking machine through the booster valve.

5. The mud bypass device for a micro pipe jacking machine according to claim 1, characterized in that The second water inlet B is communicated to the upstream side of the water outlet pipe through a 180-degree elbow.

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