Treatment device and method for mud-water balance pipe jacking encountering hard stratum

Abstract

The invention discloses a treatment device and method for mud-water balance pipe jacking encountering a hard stratum. The treatment device comprises a box body; the inlet end of the box body is connected with one end of a sludge discharge pipe through a detachable fixing piece; the other end of the sludge discharge pipe is connected with a pipe jacking machine; a material cleaning port connecting pipe is arranged at the top of the box body; the material cleaning port connecting pipe is connected with the material cleaning port through the detachable fixing piece; a filter screen is arranged in the box body; and an observation window is arranged on the side wall of the box body. The safety and durability in the jacking process of the jacking pipe are better improved, the probability of safety accidents is reduced, and the problems that in the prior art, the workload of pipeline disassembly and assembly is large, the grouting reinforcement cost is high, and the risk of bin opening treatment of boulders is large are solved.

Description

Technical Field

[0001] The invention relates to the technical field of trenchless pipeline construction, in particular to a device and method for processing mud-water balance pipe jacking encountering hard strata. Background Art

[0002] Pipe jacking is a trenchless pipeline construction technology used in the field of construction for complex geology and many ground structures. It has less impact on the surrounding environment, small construction site, low noise, and is less affected by natural conditions. The general construction process is to first dig a starting well for pipe jacking, use a pipe jacking machine to advance, and use the thrust of the main jacking cylinder of the jack and the relay room between pipelines to push the tool pipe or pipe jacking machine from the starting well through the soil layer to the receiving well for hoisting.

[0003] During the process of pipe jacking, if you encounter pebbles, gravel-containing soil layers, or even boulders, after being crushed, the gravel enters the mud discharge pipe, which is easy to cause blockage and wear of the mud discharge pipe, thus making it difficult to jack. There are generally different ways to deal with this problem. One is to close the valve after the pipe is blocked, dismantle the pipe, check the blockage location, and reinstall it after unblocking. This method requires a large amount of pipe disassembly and installation, and causes greater wear on the pipe; the second is to use cement mixing or high-pressure jet grouting to reinforce the 3m range on the left and right sides of the jacking contour line, and then open the manhole and open the warehouse to deal with the boulders. This method depends on the reinforcement effect. When there is abundant groundwater and insufficient construction experience, it is easy to lead to poor reinforcement effect and collapse problems. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for handling mud-water balance pipe jacking encountering hard formations in view of the deficiencies in the prior art, so as to better improve the safety and durability of the jacking process, reduce the probability of safety accidents, and solve the problems of large workload for disassembling and assembling pipelines, high cost for grouting reinforcement, and high risk of opening warehouses to handle isolated rocks in the prior art.

[0005] The present invention is achieved through the following technical solutions:

[0006] A device for processing mud-water balance jacking pipe encountering hard formations, comprising a box body; wherein: the inlet end of the box body is connected to one end of a mud discharge pipe through a detachable fixing piece; the other end of the mud discharge pipe is connected to a pipe jacking machine; a material cleaning port connecting pipe is provided on the top of the box body; the material cleaning port connecting pipe is connected to the material cleaning port through the detachable fixing piece; a filter screen is provided inside the box body; and an observation window is provided on the side wall of the box body.

[0007] As a further improvement of the technical solution of the invention, the detachable fixing member is a clamp.

[0008] As a further improvement to the technical solution of the invention, hanging rings are symmetrically arranged on the top of the box.

[0009] As a further improvement of the technical solution of the invention, a plurality of valves are provided on the mud discharge pipe.

[0010] As a further improvement of the technical solution of the invention, the pipe jacking machine includes a cutter disc, a mixing chamber and a mud and water chamber; the cutter disc is located at one end of the mixing chamber; the mud and water chamber is located at the other end of the mixing chamber; the outlet end of the mud and water chamber is connected to the mud discharge pipe.

[0011] As a further improvement to the technical solution of the invention, the box body, the cleaning port and the hanging ring are all made of Q235 steel.

[0012] As a further improvement to the technical solution of the invention, the observation window is made of a flange liquid level pipe sight glass.

[0013] As a further improvement to the technical solution of the invention, the clamp is made of QT450-11 cast iron.

[0014] As a further improvement to the technical solution of the invention, the filter screen is made of steel bars.

[0015] As a further improvement of the technical solution of the invention, a construction method of a device for treating a slurry-water balance pipe jacking encountering a hard formation comprises the following steps:

[0016] Step S1, the pipe jacking machine pushes forward to break the soil. The pipe jacking machine pushes forward through the jacking force provided by the rear jack and the force transmission of the completed pipe section, and the cutter head is continuously rotated to cut the soil in front. The jacking force should not be too large or too small to control the jacking speed. At the same time, the cutter head rotation speed is also controlled to keep the pressure in the soil chamber balanced with the soil pressure in front. Under normal circumstances, the jacking speed is 30-100mm per minute; Step S2, mixing the mixing chamber, and the soil and stones cut by the cutter head enter the mixing chamber through the orifice for secondary crushing;

[0017] Step S3, mixing the mud and water bin. The soil and stones in the mixing bin enter the mud and water bin through the mud inlet. The mud and water conveying system conveys mud water with a certain specific gravity into the mud and water bin to mix with the cut soil and gravel. The mud is then conveyed out through a pipeline. The mud is prepared from bentonite, water, and additives. The specific gravity is generally 1.2-1.5, so as to form a mud film in the bin to prevent the soil in front from collapsing.

[0018] Step S4, the mud discharge pipe discharges the crushed and stirred soil and stones mixed with mud water from the mud discharge pipe, and the valves are all in the open state at this time;

[0019] Step S5, the crushed stones enter the processing device, the soil, stones mixed with mud water enter the box, the larger stones are isolated by the filter net, the mud water passes through the isolation net and is discharged into the mud pool for recycling, and the stones trapped in the box are continuously cut by the pipe jacking machine in front of the soil layer to accumulate more and more stones;

[0020] Step S6, cleaning the broken stones. As more and more stones accumulate in the box, observe through the observation window. When the stones reach 2 / 3 of the box height, they can be cleaned. Cleaning requires pausing the jacking, switching the valve from the working state to the circulation state, and then unscrewing the clamp at the cleaning port, opening the cleaning port, cleaning the stones in the box, covering the cleaning port after cleaning, reinstalling the clamp, switching the valve to the working state, and continuing the jacking.

[0021] In summary, the present invention has the following beneficial effects:

[0022] (1) The present invention adopts an assembled structure, by making a pipe opening matching the diameter of the mud inlet and discharge pipe on the treatment device box, connecting them with a clamp, and the discharged slurry and sand and gravel enter the treatment device through the pipe opening, which can be quickly installed, has high construction efficiency, and has good applicability;

[0023] (2) An innovative proposal is made to install a filter in the treatment device. The discharged slurry and sand and gravel enter the treatment device through the pipe opening. The larger stones are intercepted by the filter, while the liquid can be discharged smoothly, which reduces the wear of the pipe by the larger stones and reduces the risk of pipe blockage.

[0024] (3) An innovative observation window was proposed. An observation window was set up on one side of the treatment device, so that the stone accumulation situation of the treatment device can be understood at any time so as to clean it in time and avoid blockage;

[0025] (4) The present invention has the characteristic of being recyclable. The entire treatment device can be disassembled and assembled, and the installation and disassembly are easy. It only needs to be disassembled and cleaned before being reused, and has good economic efficiency.

[0026] (5) The present invention has a simple structure, is easy to construct, and has good operability and applicability;

[0027] (6) When encountering individual boulders, the present invention can avoid using the method of opening the soil reinforcement chamber. The boulders in front can be gradually broken into small stones by gently pressing and slowly rotating the pipe jacking machine, and then intercepted and cleaned from the box, thereby improving the safety of construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a vertical view of a device for treating a slurry-water balance pipe jacking encountering a hard ground layer after installation according to an embodiment of the present invention;

[0029] Figure 2This is a plan view of a device for treating a slurry-water balance pipe jacking encountering a hard ground layer after installation according to an embodiment of the present invention;

[0030] Figure 3 It is an elevation view of a device for treating a mud-water balanced pipe jacking encountering a hard formation according to an embodiment of the present invention;

[0031] Figure 3-1 It is a side view of a device for treating a mud-water balanced pipe jacking encountering a hard formation according to an embodiment of the present invention;

[0032] Figure 3-2 It is a plan view of a device for treating a mud-water balanced pipe jacking encountering a hard formation according to an embodiment of the present invention;

[0033] Figure 3-3 A cross-sectional view of a device for treating a mud-water balanced pipe jacking encountering a hard formation according to an embodiment of the present invention;

[0034] Figure 4 This is an operation diagram of a slurry-water balance pipe jacking device for jacking into a hard formation into a broken soil body according to an embodiment of the present invention;

[0035] Figure 5 This is an operation diagram of a mixing bin mixing and crushing stones according to an embodiment of the present invention;

[0036] Figure 6 This is an operation diagram of crushed stones entering the mud and water bin according to an embodiment of the present invention;

[0037] Figure 7 This is an operation diagram of crushed stones passing through a mud discharge pipe according to an embodiment of the present invention;

[0038] Figure 8 This is an operation diagram of crushed stones entering the processing device according to an embodiment of the present invention.

[0039] In the attached figure: 1-box; 2-material cleaning port; 3-observation window; 4-lifting ring; 5-clamp; 6-filter screen; 7-mud discharge pipe; 8-knife disc; 9-mixing chamber; 10-mud and water chamber; 11-valve. DETAILED DESCRIPTION

[0040] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0041] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, upper end, lower end, top, bottom...) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0042] In the present invention, unless otherwise clearly defined and limited, the term "connection" should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features; in addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0044] The present invention is further described in detail below with reference to the accompanying drawings.

[0045] A device for processing mud-water balance jacking pipe encountering hard formations, comprising a box body; wherein: the inlet end of the box body is connected to one end of a mud discharge pipe through a detachable fixing piece; the other end of the mud discharge pipe is connected to a pipe jacking machine; a material cleaning port connecting pipe is provided on the top of the box body; the material cleaning port connecting pipe is connected to the material cleaning port through the detachable fixing piece; a filter screen is provided inside the box body; and an observation window is provided on the side wall of the box body.

[0046] Specifically, in the embodiment of the present invention, the detachable fixing member is a clamp.

[0047] Specifically, in the embodiment of the present invention, hanging rings are symmetrically arranged on the top of the box.

[0048] Specifically, in the embodiment of the present invention, a plurality of valves are provided on the mud discharge pipe.

[0049] Specifically, in the embodiment of the present invention, the pipe jacking machine includes a cutter disc, a mixing chamber and a mud and water chamber; the cutter disc is located at one end of the mixing chamber; the mud and water chamber is located at the other end of the mixing chamber; the outlet end of the mud and water chamber is connected to the mud discharge pipe.

[0050] Specifically, in the embodiment of the present invention, the box body, the cleaning port and the lifting ring are all made of Q235 steel.

[0051] Specifically, in the embodiment of the present invention, the observation window is made of a flange liquid level pipe sight glass.

[0052] Specifically, in the embodiment of the present invention, the clamp is made of QT450-11 cast iron.

[0053] Specifically, in the embodiment of the present invention, the filter screen is made of steel bars.

[0054] Specifically, in an embodiment of the present invention, a construction method of a device for processing a slurry-water balanced pipe jacking encountering a hard formation includes the following steps:

[0055] Step S1, the pipe jacking machine pushes into the broken soil. The pipe jacking machine pushes forward through the jacking force provided by the rear jack and the force transmission of the completed pipe section, and the cutter head is continuously rotated to cut the soil in front. The jacking force should not be too large or too small to control the jacking speed. At the same time, the cutter head rotation speed is also controlled to keep the pressure in the soil cabin balanced with the soil pressure in front. Under normal circumstances, the jacking speed is 30-100mm per minute;

[0056] Step S2: The mixing chamber is stirred, and the soil and stones cut by the cutter disc enter the mixing chamber through the hole for secondary crushing;

[0057] Step S3, mixing the mud and water bin. The soil and stones in the mixing bin enter the mud and water bin through the mud inlet. The mud and water conveying system conveys mud water with a certain specific gravity into the mud and water bin to mix with the cut soil and gravel. The mud is then conveyed out through a pipeline. The mud is prepared from bentonite, water, and additives. The specific gravity is generally 1.2-1.5, so as to form a mud film in the bin to prevent the soil in front from collapsing.

[0058] Step S4, the mud discharge pipe discharges the crushed and stirred soil and stones mixed with mud water from the mud discharge pipe, and the valves are all in the open state at this time;

[0059] Step S5, the crushed stones enter the processing device, the soil, stones mixed with mud water enter the box, the larger stones are isolated by the filter net, the mud water passes through the isolation net and is discharged into the mud pool for recycling, and the stones trapped in the box are continuously cut by the pipe jacking machine in front of the soil layer to accumulate more and more stones;

[0060] Step S6, cleaning the broken stones. As more and more stones accumulate in the box, observe through the observation window. When the stones reach 2 / 3 of the box height, they can be cleaned. Cleaning requires pausing the jacking, switching the valve from the working state to the circulation state, and then unscrewing the clamp at the cleaning port, opening the cleaning port, cleaning the stones in the box, covering the cleaning port after cleaning, reinstalling the clamp, switching the valve to the working state, and continuing the jacking.

[0061] Example:

[0062] Reference Figures 1 to 8 A device for processing mud-water balance pipe jacking when encountering hard ground, comprising a box body 1, a material cleaning port 2, an observation window 3, a lifting ring 4, a clamp 5, and a filter screen 6. The positions and connection relationships of the components are as follows: the box body 1 is connected to the mud discharge pipe 7 by a clamp, connected to the material cleaning port 2 by a clamp, screwed to the observation window 3, welded to the lifting ring 4, and welded to the filter screen 6. The pipe jacking machine comprises a cutter head 8, a mixing bin 9, and a mud-water bin 10. The mud discharge pipe 7 is provided with a plurality of valves 11.

[0063] The box body 1 is required to have certain strength and rigidity. It is made of Q235 steel with a thickness of not less than 3mm. The inner diameter and length are determined according to the size of the working surface space and the amount of stones to be stored. The inner diameter can be 500mm. The mud discharge pipe 7 is connected to the reserved pipe openings on both sides. The inner diameter of the pipe opening matches the inner diameter of the mud discharge pipe 7, which can be DN150mm. It is fixed and connected by the clamp 5. The connection is tight to ensure that there is no water leakage. The box body 1 can be made of large-diameter steel pipes after cutting, circular steel plates on both sides of the reserved pipe openings that are processed and welded to install the connecting pipes, the cleaning port connecting pipe (before installing the cleaning port connecting pipe, a circular hole with a diameter of 20cm needs to be cut on the upper part of the box body 1), and the observation window 3 is connected to the flange for welding and fixing. The welding requires full welding on both sides. The connecting ends of all connecting pipes are provided with grooves for connection with the clamp 5. The groove depth is generally 3-4mm. The main functions of the box 1 are fourfold: first, it provides space for storing crushed stones to reduce the wear of the stones on the pipeline; second, it has sufficient strength to withstand the liquid pressure in the pipeline without leakage; third, it serves as the main component of the processing device, connecting other components to enable the processing device to function.

[0064] The cleaning port 2 is required to have a certain strength. It is made of Q235 steel with a thickness of not less than 3mm. Its inner diameter matches the diameter of the reserved cleaning port connecting pipe of the box body 1. The inner diameter can be 20cm. The ends are provided with grooves for connection with the clamp 5. The groove depth is generally 3-4mm. It is connected with the reserved cleaning port connecting pipe of the box body 1 by the clamp 5. The top is connected with a circular plate protruding 3cm from the outer edge of the pipe. The diameter of the circular plate can be 26cm and the thickness is 3mm. It is welded to the pipeline. The cleaning port 2 has two functions: one is to provide a channel for cleaning the gravel in the box body 1. The accumulated gravel inside the box body 1 can be cleaned through the cleaning port 2; the second is that the clamp 5 connection is pre-made, which is convenient for installation and disassembly; the third is that the protruding flange can be pulled to facilitate the opening of the cleaning port 2, which is operable.

[0065] The observation window 3 is made of a flange liquid level pipe sight glass, with an inner diameter of 15 cm, a liquid level pipe sight glass thickness of 8 mm, a light transmittance of 92%, and can withstand water pressure without water leakage, and is flange-connected with the reserved flange of the box body 1. The observation window 3 has the following functions: observing the accumulation of gravel inside the box body 1, understanding the situation, so as to clean it in time and prevent blockage.

[0066] The lifting ring is made of Q235 steel with a thickness of 1 cm. It is required to be able to bear the weight of the processing device itself. The lifting ring is welded to the box body 1, and all connection positions are welded tightly. The function of the lifting ring: connected with the lifting rope, hoisted to the underground by hoisting equipment, and then transported to the equipment installation location by a transport trolley.

[0067] The clamp 5 is made of QT450-11 cast iron with a specification of DN150mm. The actual specification matches the specification of the connected pipe. During installation, a flexible sealing gasket is installed in the middle of the pipe connection, and then the clamp 5 is clamped into the pipe groove. Then the clamping condition is checked. After checking that there is no abnormality, the bolts of the clamp 5 are tightened. Its functions are: first, it connects pipes of different sections to enhance the integrity of the device; second, it is simple to operate, easy to connect, and fast in construction. It should be noted that the clamp connection described in the present invention can be replaced by other detachable pipe connection methods; all given specifications and sizes are only reference values ​​for this patent.

[0068] The filter screen 6 is made of φ10 steel bars, the intersections of the isolation screen are welded, and the contact parts with the box body 1 are fully welded. The size of the filter screen 6 is determined according to the size of the through hole of the top pipe cutter head 8, which is slightly smaller than the through hole and can be 5 cm. Its functions are: to filter and intercept, to intercept larger stones into the device, but not to affect the passage of liquid.

[0069] A construction method for a device for treating a slurry-water balance pipe jacking encountering a hard formation comprises the following steps:

[0070] (1) Pipe jacking to break the soil. The pipe jacking machine pushes forward through the jacking force provided by the rear jack and the force transmitted by the completed pipe section, and continuously rotates the cutter head 8 to cut the soil in front. The jacking force should not be too large or too small to control the jacking speed. At the same time, the rotation speed of the cutter head 8 should also be controlled to keep the pressure in the soil compartment balanced with the soil pressure in front. Under normal circumstances, the jacking speed is between 30-100mm per minute. Figure 4 .

[0071] (2) Mixing in the mixing chamber 9. The soil and rocks cut off by the cutter head 8 enter the mixing chamber 9 through the hole for secondary crushing. Figure 5 .

[0072] (3) Mixing in the mud and water tank 10. The soil and rocks in the mixing tank 9 enter the mud and water tank 10 through the mud inlet. The mud and water conveying system conveys mud water with a certain specific gravity into the mud and water tank 10 to mix with the cut soil and gravel, and then conveys the soil out through the pipeline. The mud is prepared from bentonite, water, and additives, and the specific gravity is generally 1.2-1.5, so as to form a mud film in the tank to prevent the soil in front from collapsing. Figure 6 .

[0073] (4) Discharge from the mud discharge pipe 7. The crushed and stirred soil and stones mixed with muddy water are discharged from the mud discharge pipe 7, and the valve 11 is in the open state at this time. Figure 7 .

[0074] (5) Crushed stones enter the processing device. Soil, stones and muddy water enter the box 1. Larger stones are isolated by the filter 6. The muddy water passes through the isolation net and is discharged into the mud pool for recycling. The stones trapped in the box 1 are continuously cut by the pipe jacking machine in front of the soil layer, and more and more stones are accumulated. Figure 8 .

[0075] (6) Clean the broken stones. As more and more stones accumulate in the box 1, they can be observed through the observation window 3. When the stones reach 2 / 3 of the height of the box 1, they can be cleaned. Cleaning requires suspending the jacking, switching the valve 11 from the working state (water inlet and mud discharge state) to the circulation state (pipeline cleaning state), and then unscrewing the clamp 5 at the cleaning port 2, opening the cleaning port 2, and cleaning the stones in the box 1. After cleaning, cover the cleaning port 2, reinstall the clamp 5, and then switch the valve 11 to the working state to continue jacking.

[0076] In summary, the present invention can better improve the safety and durability of the pipe jacking process, reduce the probability of safety accidents, and solve the problems of large workload of disassembling and assembling pipes, high cost of grouting reinforcement, and high risk of opening warehouse to handle isolated rocks in the prior art. The present invention has the following beneficial effects:

[0077] (1) The present invention adopts an assembled structure, by making a pipe opening matching the diameter of the mud inlet and outlet pipe 7 on the treatment device box 1, connecting with a clamp 5, and the discharged slurry and sand and gravel enter the treatment device through the pipe opening, which can be quickly installed, has high construction efficiency, and has good applicability;

[0078] (2) An innovative proposal is made to install a filter screen 6 in the treatment device, and the discharged slurry and sand and gravel enter the treatment device through the pipe opening. The stones with larger particle sizes are intercepted by the filter screen 6, while the liquid can be discharged smoothly, thereby reducing the wear of the pipeline by the stones with larger particle sizes and reducing the risk of pipe blockage;

[0079] (3) An innovative proposal is made to set up an observation window 3. Setting up an observation window 3 on one side of the processing device allows the user to know at any time the stone accumulation situation of the processing device so as to clean it in time and avoid blockage;

[0080] (4) The present invention has the characteristic of being recyclable. The entire treatment device can be disassembled and assembled, and the installation and disassembly are easy. It only needs to be disassembled and cleaned before being reused, and has good economic efficiency.

[0081] (5) The present invention has a simple structure, is easy to construct, and has good operability and applicability;

[0082] (6) When encountering individual boulders, the present invention can avoid using the method of opening the soil reinforcement chamber. The boulders in front can be gradually broken into small stones by gently pressing and slowly rotating the pipe jacking machine, and then intercepted and cleaned from the box body 1, thereby improving the safety of construction.

[0083] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A device for treating a slurry-water balance pipe jacking encountering a hard formation, comprising a box; characterized in that: The inlet end of the box body is connected to one end of the mud discharge pipe through a detachable fixing piece; the other end of the mud discharge pipe is connected to a pipe jacking machine; a material cleaning port connecting pipe is arranged on the top of the box body; the material cleaning port connecting pipe is connected to the material cleaning port through the detachable fixing piece; a filter screen is arranged inside the box body; and an observation window is arranged on the side wall of the box body.

2. The device for treating a slurry-water balanced pipe jacking encountering a hard formation according to claim 1, characterized in that: The detachable fixing member is a clamp.

3. The device for treating a slurry-water balanced pipe jacking encountering a hard formation according to claim 1, characterized in that: The top of the box body is symmetrically provided with hanging rings.

4. The device for treating a slurry-water balanced pipe jacking encountering a hard formation according to claim 1, characterized in that: The mud discharge pipe is provided with a plurality of valves.

5. The device for treating a slurry-water balanced pipe jacking encountering a hard formation according to claim 1, characterized in that: The pipe jacking machine includes a cutter disc, a mixing chamber and a mud and water chamber; the cutter disc is located at one end of the mixing chamber; the mud and water chamber is located at the other end of the mixing chamber; and the outlet end of the mud and water chamber is connected to the mud discharge pipe.

6. The device for treating a slurry-water balanced pipe jacking encountering a hard formation according to claim 3, characterized in that: The box body, the cleaning port and the lifting ring are all made of Q235 steel.

7. The device for treating a slurry-water balanced pipe jacking encountering a hard formation according to claim 1, characterized in that: The observation window is made of a flange liquid level pipeline sight glass.

8. The device for treating a slurry-water balanced pipe jacking encountering a hard formation according to claim 2, characterized in that: The clamp is made of QT450-11 cast iron.

9. The device for treating a slurry-water balanced pipe jacking encountering a hard formation according to claim 1, characterized in that: The filter screen is made of steel bars.

10. A construction method for a device for treating a slurry-water balance pipe jacking encountering a hard ground layer, characterized in that: The following steps are involved: Step S1, the pipe jacking machine pushes into the broken soil. The pipe jacking machine pushes forward through the jacking force provided by the rear jack and the force transmission of the completed pipe section, and the cutter head is continuously rotated to cut the soil in front. The jacking force should not be too large or too small to control the jacking speed. At the same time, the cutter head rotation speed is also controlled to keep the pressure in the soil cabin balanced with the soil pressure in front. Under normal circumstances, the jacking speed is 30-100mm per minute; Step S2: The mixing chamber is stirred, and the soil and stones cut by the cutter disc enter the mixing chamber through the hole for secondary crushing; Step S3, mixing the mud and water bin. The soil and stones in the mixing bin enter the mud and water bin through the mud inlet. The mud and water conveying system conveys mud water with a certain specific gravity into the mud and water bin to mix with the cut soil and gravel. The mud is then conveyed out through a pipeline. The mud is prepared from bentonite, water, and additives. The specific gravity is generally 1.2-1.5, so as to form a mud film in the bin to prevent the soil in front from collapsing. Step S4, the mud pipe is used for discharge. The crushed and stirred soil and stones mixed with muddy water are discharged from the mud pipe. At this time, all valves are in the open state. Step S5, the crushed stones enter the processing device, the soil, stones mixed with mud water enter the box, the larger stones are isolated by the filter net, the mud water passes through the isolation net and is discharged into the mud pool for recycling, and the stones trapped in the box are continuously cut by the pipe jacking machine in front of the soil layer to accumulate more and more stones; Step S6, cleaning the broken stones. As more and more stones accumulate in the box, observe through the observation window. When the stones reach 2 / 3 of the box height, they can be cleaned. Cleaning requires pausing the jacking, switching the valve from the working state to the circulation state, and then unscrewing the clamp at the cleaning port, opening the cleaning port, cleaning the stones in the box, covering the cleaning port after cleaning, reinstalling the clamp, switching the valve to the working state, and continuing the jacking.

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