River bottom slurry shield slurry flow state solidification under-pressure bin opening construction method

Abstract

The invention relates to a river bottom slurry shield slurry flow state solidification under-pressure bin opening construction method which is used for adapting to the situation that a caving arch is formed on the upper portion of a shield tunneling machine in the tunneling construction process under the river surface, under-pressure bin opening operation of the shield tunneling machine is conducted when the shield tunneling machine is shut down, and the under-pressure bin opening construction method comprises the following steps that S1, preparation work is conducted; s2, mud and water in the mud and water bin are replaced, wherein S2.1, a mud and water replacement path is established; s2.2, muddy water in the bin is replaced in two stages; s3, slurry flow state solidification; s4, opening the bin under pressure; multi-phase flow slurry of a slurry bin when the slurry shield is shut down is replaced with viscous slurry, solidified soil which is moderate in strength, self-compacting, stable in size and good in impermeability is formed through flow state solidification, then bin opening operation under pressure can be directly carried out, the bin opening efficiency is improved, and rapid bin cleaning is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel engineering construction, in particular to a river bottom mud-water shield mud flow solidification pressure chamber opening construction method. Background Art

[0002] Opening the warehouse under pressure is an effective means to solve the problems of tool wear and drainage stagnation in the warehouse during the construction of slurry shield. Soil gas retention and excavation surface stability are two key factors for the smooth progress of opening the warehouse under pressure. Generally, traditional bentonite slurry is used to infiltrate and establish a mud film, supplemented by diaphragm reinforcement when necessary to achieve opening the warehouse under pressure. However, for the fragmented and permeable soft-upper-hard-lower-bottom strata with vertical and horizontal cracks at the bottom of the river, due to the collapse arch on the top of the shield machine, the traditional method of establishing a mud film often ends in failure, and the only solution is to fill the warehouse.

[0003] In actual construction, the mortar filling method has high strength and is difficult to clean, and has poor permeability, resulting in a long time-consuming warehouse opening; the Hengdun mud filling method has a complex mixing process, high viscosity, and is difficult to clean and has high cost; both have the problem of low warehouse opening efficiency and cannot achieve rapid warehouse clearing. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art, provide a riverbed mud water shield mud flow solidification pressure opening construction method, to solve the problem of low opening efficiency of the pressure opening method in the prior art.

[0005] To achieve the above object, the present invention provides a river bottom mud water shield mud flow solidification pressure opening construction method, which is used to adapt to the situation that a collapse arch is formed on the upper part of the shield machine during the tunneling construction under the river surface, and the pressure opening operation of the shield machine is performed when the machine is stopped. The pressure opening construction method comprises the following steps: S1. Preparation; S2. Mud and water replacement in mud and water bin, including: S2.1. Establish a mud-water replacement path: provide an electric locomotive to establish a replacement path from ground mixing of new slurry - electric locomotive - synchronous grouting bucket - mud-water bin - waste slurry treatment system; S2.2, two-stage replacement of mud and water in the silo: using viscous mud and clogging mud in turn to replace the mud and water in the silo twice according to the established mud and water replacement path, until the mud and water indicators discharged from the silo meet the standards; S3, mud flow solidification; S4. Open warehouse under pressure.

[0006] By adopting this technical solution, the multiphase flow mud in the slurry bin is replaced with viscous mud when the slurry shield is shut down. Through fluid solidification, cement-stabilized soil with moderate strength, self-compacting, stable volume and good impermeability is formed. After that, the bin can be opened directly under pressure, which increases the opening efficiency and achieves rapid clearance.

[0007] Furthermore, the preparation work in step S1 includes the following steps: S1.1, hoop grouting: block the shield tail of the shield machine, and inject mud through the grouting holes around the shield machine to wrap the shield machine shell; S1.2, Clearing the warehouse under pressure: Enter the air cushion warehouse and mud water warehouse under pressure to remove the foreign matter accumulated at the bottom of the air cushion warehouse and mud water warehouse; S1.3. Close the front gate: Close the front gate to isolate the air cushion tank and the mud and water tank.

[0008] Furthermore, the preparation work in step S1 further includes the following steps: S1.4. Maintenance of mud and water circulation system under normal pressure: Except for the mud and water bin, the mud discharge part of the shield machine circulation system should be cleared under normal pressure conditions.

[0009] Furthermore, the preparation work in step S1 further includes the following steps: S1.5. Set up pipeline backwashing function: install multiple second ball valves on the pipeline inside the shield machine, set first pressure gauges on the second ball valves, and judge whether the pipelines between adjacent second ball valves are blocked by the values ​​of adjacent first pressure gauges, and provide a basis for pipeline backwashing and dredging; The pipeline backwashing and dredging is achieved by the clean water tank, extrusion pump, soil box and connecting pipelines. After the local blockage of the pipeline appears and is determined in the pipeline of the shield machine, the backwashing path of clean water tank-extrusion pump-the second ball valve of the pipeline in the shield machine-blocked pipeline-the second ball valve of the pipeline in the shield machine-soil box is formed under the action of the connecting pipeline, and the backwashing and dredging is achieved by starting the extrusion.

[0010] Furthermore, the fluidization solidification of the mud in step S3 includes the following steps: S3.1. Establish a curing agent mixing system: provide curing agent mixing equipment, which is transported in by an electric locomotive. The slurry outlet of the curing agent mixing equipment is connected to the synchronous grouting bucket through the third slurry outlet pipe, and the slurry return outlet of the curing agent mixing equipment is connected to the mud and water replacement outlet of the mud and water bin through the return pipeline to form a circulatory passage; S3.2, Fluidized soil replacement in mud and water bin: The curing agent mixing equipment mixes the curing agent, and at the same time, it is sent into the mud and water bin along the mud and water replacement path through the synchronous grouting bucket to mix with the internal mud and water. The fluidized soil slurry in the bin formed by solidification flows back to the curing agent mixing equipment; S3.3. Evaluate the fluid soil slurry index in the silo: At the mud-water replacement outlet of the silo, discharge the fluid soil slurry in the silo at regular intervals for measurement. If it does not meet the requirements, continue to add the curing agent. If it meets the requirements, stop; S3.4. Graded pressurized penetration: The mud and water bin is pressurized in stages to allow the fluidized soil slurry in the bin to penetrate into the collapsed arch formed on the shield machine. During this period, the fluidized soil slurry in the bin is replenished to the mud and water bin in time until the collapsed arch on the shield machine is filled densely.

[0011] Furthermore, step S3.4 includes filling detection of the collapse arch while performing graded pressure infiltration; The filling detection of the collapsed arch includes setting a filling detector from the river surface drilling platform to a safe distance above the collapsed arch, performing filling detection inside the collapsed arch during graded pressurized infiltration, pulling out the filling detector after ensuring that the collapsed arch is filled densely, and simultaneously grouting to fill the channel formed by the filling detector.

[0012] Furthermore, the pressure opening in step S4 includes the following steps: S4.1. Confirmation of warehouse opening conditions: After the strength of the solidified soil formed by the solidification of the fluidized soil slurry in the warehouse reaches the standard, open the fourth ball valve at different parts of the chest plate of the mud and water warehouse to observe the water seepage. If the water seepage meets the requirements, the warehouse opening conditions are met; S4.2. Clean the solidified soil in different areas: Workers use the man-room pressurization to enter the mud and water bunker, clean the solidified soil in the order of mud and water bunker-knife box-spoke opening-face plate, and then check the knives and replace them; S4.3. Re-push after completion: Workers return to the man chamber to decompress, and simultaneously use new slurry to raise the liquid level inside the mud and water chamber through the mud and water replacement path. After the workers decompress and exit the chamber, the shield machine is re-pushed.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The multiphase flow mud in the mud-water bin when the slurry shield is shut down is replaced with viscous mud as the basis, and solidified soil with moderate strength, self-compacting, stable volume and good impermeability is formed through fluid solidification. After that, the bin can be opened directly under pressure to increase the opening efficiency and realize rapid clearance.

[0014] 2. By setting up a collapsed arch filling detector on the river surface, the collapsed arch can be filled densely with solidified soil, effectively supporting the upper part of the tunnel to prevent soil loss. Finally, the pressure opening process is optimized to improve the opening efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the construction process of the mud flow solidification and pressure opening construction method of the river bottom mud water shield in the present invention; Figure 2 It is a schematic diagram of the actual working condition of the shield machine in the riverbed mud water shield slurry flow solidification pressure opening construction method of the present invention; Figure 3 It is a schematic diagram of the shield tail anti-leakage device of the river bottom mud water shield slurry flow solidification pressure opening construction method of the present invention; Figure 4 It is a schematic diagram of the front view and side view of the steel plate seal of the river bottom mud water shield slurry flow solidification pressure opening construction method of the present invention; Figure 5 It is a schematic diagram of the backwashing process of the mud flow solidification and pressure opening construction method of the river bottom mud water shield in the present invention; Figure 6 It is a schematic diagram of the mud and water replacement path of the mud and water shield tunneling construction method of the present invention; Figure 7 It is a schematic diagram of a curing agent mixing system of the fluidized solidification and pressure-opening construction method of the riverbed mud and water shield tunneling in the present invention; Figure 8 It is a schematic diagram of the third ball valve of the slurry mixing box of the mud water shield tunneling slurry flow solidification pressure opening construction method in the present invention; Fig. 9 It is a schematic diagram of a collapse arch filling detector of the mud flow solidification and pressure opening construction method of the river bottom mud water shield in the present invention; Fig.10 It is a side view and front view schematic diagram of the regional cleaning of the mud flow solidification and pressure opening construction method of the river bottom mud water shield in the present invention; Fig.11 It is a front view and a side view schematic diagram of the opening and pressure-maintaining path of the first stage of the river bottom mud-water shield slurry flow solidification pressure-opening construction method of the present invention; Fig.12 It is a schematic diagram of the distribution of the rapid drainage channels and the connection of the variable-diameter end heads in the mud-water shield tunneling slurry flow solidification and pressure-opening construction method in the present invention; Fig.13 It is a front view and a side view schematic diagram of the opening and pressure-maintaining path of the second stage of the riverbed mud-water shield slurry flow solidification pressure-opening construction method of the present invention.

[0016] Explanation of reference numerals: 1. Shield machine; 2. River surface; 3. Collapse arch; 4. Lens; 5. Sponge bar; 6. Baffle; 7. Safety chain; 8. Boot plate; 9. Steel plate; 10. Door frame; 11. Water stop strip; 12. Bolt; 13. Lifting hole; 14. Steel handle; 15. First ball valve; 16. Clean water tank; 17. Extrusion pump; 18. Soil box; 19. Connecting pipeline; 20. Electric locomotive; 21. Blocking pipeline; 22. Second ball valve; 23. First pressure gauge; 24. Mix new slurry on the ground; 25. Synchronous grouting bucket; 26. Slurry inlet hole; 27. Mud and water bin; 28. First air release valve; 29. ​​Synchronous grouting pipe; 30. Drain pipeline; 31. Filling port; 32. Shear pump; 33. Mixing box; 34. First slurry outlet pipe; 35. Second slurry outlet pipe; 36. Third slurry outlet pipe; 37. Gate valve; 38. Return pipeline; 39. Third ball valve; 40. Steel casing; 41. Sleeve valve pipe; 42. Steel cover; 43. Cutter head; 44. Cutter box; 45. Spoke opening; 46. Panel; 47. Air cushion chamber; 48. Connecting pipeline; 49. First area; 50. Breast plate; 51. Man chamber; 52. Second air release valve; 53. Balance chamber; 54. Special pipeline; 55. Self-operated control valve; 56. Drain hose; 57. Variable diameter end; 58. Conical sealing gasket; 59. Drain port; 60. Second area; 61. Fourth ball valve. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] Please refer to the attached Figure 1 , 2 11. The present invention provides a method for opening the mud shield machine under pressure during mud flow solidification. The actual working condition is that the mud shield machine 1 has a mud bunker 27 and an air cushion bunker 47 provided with a front gate, and the mud discharge path is the mud bunker 27-front gate-air cushion bunker 47-grid-shield machine internal mud discharge pipe-mud discharge pump-ground mud and water solid control system; the shield machine 1 together with the trolley has entered the river bottom, the cutterhead is in the section of the lower broken weathered rock layer and the upper weathered soil, a cavity of the collapse arch 3 has been formed above the shield machine 1, and the stones falling into the bin cause the mud discharge path to be seriously stagnant, causing the circulation system to be paralyzed; the mud bunker 27 and the upper cavity are filled with pressurized multiphase flow mud, and the collapse arch 3 has a tendency to further develop toward the riverbed at the bottom of the river, and even forms a lens 4 in the stratum. The construction method for opening the mud bunker under pressure comprises the following steps: Step 1: Preparation 1.1. Hoop grouting: Grouting holes around the shield machine 1 are used to inject cement grout to wrap the shield machine 1 shell. The segments in the shield tail are filled with shield tail grease and anti-leakage devices are installed. Cement-water-glass double liquid slurry is injected into the shield tail segments; Preferably, please see the attached Figure 3The anti-leakage device consists of a sponge strip 5 and a baffle 6. The sponge strip 5 is filled in the gap between the outer arc surface of the segment and the inner arc surface of the shield tail. The baffle 6 is placed between the end surface of the segment and the boot plate 8 of the thrust jack of the shield machine 1. The baffle 6 and the boot plate 8 are connected by a safety chain 7 to seal the end of the segment in the shield body to prevent leakage of the shield tail.

[0019] 1.2. Clearing the warehouse under pressure: The air cushion warehouse 47 is fed under pressure to remove the hard foreign objects such as stones and crushing cutter rings accumulated at the bottom of the mud and water warehouse 27 and the air cushion warehouse 47, especially to clean the bottom of the front gate to prevent the front gate from being loosely closed or the front gate from being partially bent due to cutting foreign objects.

[0020] 1.3. Close the front gate: Please refer to the attached Figure 4 , close the front gate to isolate the mud and water bin 27 from the air cushion bin 47; and install a steel plate 9 with a water stop strip 11 from the air cushion bin 47 to cut off the infiltration path between the mud and water bin 27 and the air cushion bin 47; Preferably, bolt holes are provided around the steel baffle plate 9 and an annular rubber water stop strip 11 is installed. The steel baffle plate 9 is connected to the door frame 10 of the front gate by bolts 12, which further plays a sealing and partitioning effect, and can realize entering the air cushion chamber 47 under normal pressure. The installation of the steel baffle plate 9 is completed through the lifting hole 13; the steel handle 14 is used to assist in positioning and installation manually; and the first ball valve 15 on the steel baffle plate 9 is used to observe the situation of the mud and water chamber 27.

[0021] 1.4. Normal pressure inspection of the mud and water circulation system: Except for the mud and water bin 27, the mud discharge part of the circulation system should be dredged under normal pressure conditions, that is, the mud discharge path of the front gate-air cushion bin 47-grid-shield machine 1 internal mud discharge pipe-mud discharge pump-ground mud and water solid control should be unobstructed, so as to prepare for the subsequent re-pushing of the shield machine 1.

[0022] 1.5. Set the pipeline backwash function: Please refer to the attached Figure 5 A plurality of second ball valves 22 are installed in the pipeline of the shield machine 1. A first pressure gauge 23 is arranged on the second ball valve 22 to determine the blockage position of the blocked pipeline 21 by monitoring the pressure change, and realize the function of backwashing and unblocking the pipeline at the same time; Preferably, the pipeline backwashing and unblocking function is realized by the clean water tank 16, the extrusion pump 17, the soil box 18 and the connecting pipeline 19. After the position of the pipeline blockage is determined, the backwashing and unblocking is realized by utilizing the path of the clean water tank 16-extrusion pump 17-the second ball valve 22 of the pipeline in the shield machine 1-the blocked pipeline 21-the second ball valve 22 of the pipeline in the shield machine 1-the soil box 18; this function can be used as a method for unblocking pipeline blockage in subsequent steps; wherein the clean water tank 16 is located on the shield machine 1 trolley, and the extrusion pump 17, the soil box 18 and the connecting pipeline 19 are installed on the electric locomotive 20, which can be conveniently moved within the interval.

[0023] Step 2: Mud and water replacement in mud and water tank 27 2.1、Establish mud and water displacement path: Please refer to the attached Figure 6 The mud-water replacement path of the mud-water bin 27 is ground mixing new slurry 24 - electric locomotive 20 - synchronous grouting bucket 25 - slurry inlet hole 26 - pressurizing into the mud-water bin 27 - first air release valve 28 to release the multiphase flow mud of the mud-water bin 27; Preferably, the path from the synchronous grouting barrel 25 to the bottom of the mud and water bin 27 is obtained by relocating the synchronous grouting pipe 29; the first air release valve 28 at the top of the mud and water bin 27 is connected to the sewage pipeline 30, and the sewage pipeline 30 merges into the waste slurry disposal system on the shield trolley.

[0024] 2.2. Two-stage replacement of mud and water in the silo: Through the above replacement path, the mud and water in the silo are replaced in the first stage with viscous mud mixed with bentonite and polymer to replace the multiphase flow mud in the mud and water silo 27; the viscous mud is composed of: 1m 3 25kg HS-1, 5kg HS-3 and 40kg bentonite are mixed with water. The consistency of the slurry released from the first air release valve 28 at the top of the first stage reaches 50-60s and the specific gravity reaches 1.1; Through the above replacement path, the mud and water in the replacement bin are replaced by the plugging mud to replace the viscous mud; on the basis of the viscous mud, every 1m 3 100 kg of heavy calcium powder and 5 kg of plugging agent were added to mix the plugging mud. The consistency of the slurry released from the first air release valve 28 at the top of the second stage reached 180s, the specific gravity reached 1.25, and the sand content was less than 1.5%.

[0025] Step 3: Mud flow solidification 3.1. Establishing a curing agent mixing system: Please refer to the attached Figure 7 The provided shield machine 1 carries a curing agent mixing device on the electric locomotive 20 to form a curing agent mixing system, which includes a material filling port 31, a shear pump 32, a slurry mixing box 33, a synchronous grouting barrel 25, a first slurry outlet pipe 34, a second slurry outlet pipe 35 and a third slurry outlet pipe 36; the slurry mixing box 33 is filled with replaced mud, and the curing agent is sucked from the material filling port 31 through the negative pressure principle. The shear pump 32 sucks the replaced mud water from the slurry mixing box 33 through the first slurry outlet pipe 34, and the slurry is sheared and mixed with the curing agent in the shear pump 32, and is transported to the slurry mixing box 33 through the first slurry outlet pipe 34. The fluidized soil slurry meets the requirements and is transported to the synchronous grouting barrel 25 through the third slurry outlet pipe 36; the second slurry outlet pipe 35 to the slurry mixing box 33 and the third slurry outlet pipe 36 to the synchronous grouting barrel 25 are switched through the gate valve 37 on the pipeline; Preferably, the curing agent mixing amount is 24%; the fluidized soil slurry is replaced through the mud-water replacement path of step 2, which is different from step 2 in that the slurry released by the first air release valve 28 returns to the slurry mixing box 33 through the return pipe 38; For further information, please see the attached Figure 8A third ball valve 39 is provided on the upper, middle and lower parts of the mixing box 33. During the mixing process of the fluidized soil slurry, its index is tested every ten minutes. The specific gravity of the fluidized soil slurry reaches 1.4 to meet the requirements.

[0026] 3.2. Fluidized soil replacement in the mud and water bin 27: The fluidized soil slurry replacement in the mud and water bin is implemented using the mud and water replacement path in step 2, except that the fluidized soil slurry released by the first air release valve 28 returns to the slurry mixing box 33 through a pipeline.

[0027] 3.3. Evaluate the indicators of liquid soil slurry in the bin: intermittently rotate the cutter head 43 to mix the fluidized soil in the mud and water bin 27 evenly to avoid stratification and segregation; release the slurry from the second air release valve 52 on the top of the breast plate 50 for measurement. If it does not meet the requirements, return to step 3.2; 3.4. Graded pressure penetration: Graded pressure penetration is carried out in four stages; Furthermore, the final penetration pressure setting value of the above-mentioned graded pressurization is twice the pressure of the pressurized chamber opening operation, the graded starting pressure setting value is the water and soil pressure at the current position of the shield machine 1, and the four-stage graded pressurization values ​​are linearly interpolated; the pressurization pressure is obtained by the air cushion chamber 47 through the connecting pipeline 48 connecting the air cushion chamber 47 and the mud and water chamber 27. During the pressurized penetration process, attention is paid to the liquid level of the fluidized soil slurry in the mud and water chamber 27, and the fluidized soil slurry is timely injected through the slurry inlet hole 26 on the breast plate 50 of the mud and water chamber 27. The pressure is maintained for a certain period of time in each stage of pressurized penetration; Furthermore, graded pressurized infiltration is implemented in four stages. In the first stage, the pressure at the top of the pressurized infiltration mud and water tank 27 is set to 3.0~3.5 bar, and the pressure is maintained for 5 hours; in the second stage, the pressure at the top of the pressurized infiltration mud and water tank 27 is set to 3.6~4.0 bar, and the pressure is maintained for 10 hours; in the third stage, the pressure at the top of the pressurized infiltration mud and water tank 27 is set to 4.0~4.5 bar, and the pressure is maintained for 10 hours; in the fourth stage, the pressure at the top of the pressurized infiltration mud and water tank 27 is set to 4.5~5.0 bar, and the pressure is maintained for 10 hours; Furthermore, during the above four stages of pressurized infiltration and pressure stabilization, the cutter head 43 is continuously rotated in a small amplitude to keep the pressure fluctuation at the top of the incision stable during the pressurization process.

[0028] 3.5. Collapse Arch 3 Filling Detection: Set up a collapse arch 3 filling detector on the river surface to guide the solidified soil formed by the solidification of the fluidized soil to fill the collapse arch 3 densely; For further information, please see the attached Fig. 9The above-mentioned collapse arch 3 filling detector is set at the same time as the graded pressurized penetration; the collapse arch 3 filling detector is set above the collapse arch 3 boundary through the river surface 2 drilling platform, and the provided collapse arch 3 filling detector is composed of a large-diameter steel casing 40 and a small-diameter sleeve valve tube 41, and a steel cover 42 and a pressure gauge are provided at the top of the steel casing 40; during the graded pressurized penetration process, the value of the pressure gauge at the top of the steel casing 40 is observed, and the steel cover 42 is opened after the pressure rises and stabilizes, and the fluidized solidified slurry is observed to enter the steel casing 40 to verify that the collapse arch 3 has been filled densely; Furthermore, after the collapse arch 3 is filled densely, the large-diameter through-hole steel casing 40 is first pulled out, and then the small-diameter sleeve valve tube 41 is withdrawn and grouting is performed while withdrawing, so as to fill the formation lens 4 and the collapse arch 3 detector drilling channel densely.

[0029] Step 4: Opening a warehouse under pressure 4.1. Confirmation of opening conditions: When the strength of the solidified soil sample maintained under the same conditions is ≥0.6 MPa, open the fourth ball valve 61 at different positions of the chest plate 50 to observe the water seepage. If the water seepage is less than 1 m 3 / d means that the warehouse opening conditions are met; the solidified soil sample cured under the same conditions as above is prepared from the fluidized solidified slurry that meets the indicators in the slurry mixing box 33.

[0030] 4.2. Clean up the solidified soil in different areas: Please refer to the attached Fig.10 , formulate the principle of cleaning in different areas, clean the fluidized solidified soil in the order of mud and water bin 27-knife box 44-spoke opening 45-panel 46, then check the cutter head 43 and replace the cutter, clean the mud and water bin 27 from top to bottom, clean the knife box 44 from top to bottom, clean the spoke opening 45 from top to bottom, and finally clean the panel 46 from top to bottom.

[0031] 4.3. First stage of opening a position: Please refer to the attached Fig.11, the mud and water bin 27 is filled with solidified soil, and the connecting pipe 48 between the air cushion bin 47 and the mud and water bin 27 is in a blocked state. Before the connecting pipe 48 between the air cushion bin 47 and the mud and water bin 27 is unblocked, it is the first stage of opening the bin; in order to clean the first area 49, the second air release valve 52 on the chest plate 50 of the shield machine 1 and on the upper part of the man bin 51 and the balance bin 53 entering the mud and water bin 27 inside the man bin 51 are unblocked, and the air cushion bin 47 and the second air release valve 52 are connected with a special pipe 54; when the man bin 51 is increased or reduced in pressure, the pressure is manually controlled by an independent air supply air compressor, and the balance bin When the balance chamber 53 is opened, the man chamber 51 and the mud and water chamber 27 are connected. When the balance chamber 53 is closed, the man chamber 51 can be independently pressurized and depressurized. The door of the mud and water chamber 27 can be opened. When the door is opened, the opening pressure is controlled by the path of the self-operated control valve 55-air cushion chamber 47-second air release valve 52-mud and water chamber 27-man chamber 51. When the door is closed, the path of the self-operated control valve 55-air cushion chamber 47-second air release valve 52-mud and water chamber 27 is established to independently maintain the pressure of the mud and water chamber 27. A quick drainage channel 1 from the mud and water chamber 27 to the bottom of the man chamber 51 is established. See Appendix for further information. Fig.12 Preferably, the path of the quick drainage channel 1 is from the mud and water bin 27 to the bottom of the man bin 51, and is composed of a drainage hose 56, a reducing end 57 and a conical sealing gasket 58. The reducing end 57 of the drainage hose 56 is placed in the accumulated water in the mud and water bin 27, and the other end of the reducing end 57 is covered with a conical sealing gasket 58 and inserted into the bottom drain port 59 of the man bin 51. The conical sealing gasket 58 closes the leakage channel between the reducing end 57 and the bottom drain port 59. During the drainage process, the water level changes of the accumulated water in the bin must be closely monitored to prevent the reducing end 57 from leaking out of the water surface, and the bottom drain port 59 of the man bin 51 must be closed in time to prevent the mud and water bin 27 from leaking due to drainage.

[0032] 4.4. Second stage of warehouse opening: After the connecting pipe 48 between the air cushion bin 47 and the mud and water bin 27 is unblocked, the second stage of warehouse opening enters a normal working state. To clean the second area 60, when the door of the man warehouse 51 is opened, the pressure is controlled by the system of the self-operated control valve 55-air cushion bin 47-connecting pipe 48-mud and water bin 27-man warehouse 51; when the door of the man warehouse 51 is closed, the path of the self-operated control valve 55-air cushion bin 47-connecting pipe 48-mud and water bin 27 is established to maintain the pressure of the mud and water bin 27; after the fourth ball valve 61 on the chest plate 50 is unblocked, a quick drainage channel is established by using the mud and water bin 27-fourth ball valve 61.

[0033] 4.5. Re-pushing after completion: After the warehouse is opened and cleaned in stages, the front gate is opened, and the door of man chamber 51 is closed. Personnel enter man chamber 51 to decompress the pressure, and new slurry is used to raise the liquid level simultaneously. After the personnel are decompressed and leave the chamber, the shield machine 1 is re-pushed.

[0034] The present invention is described in detail above in conjunction with the embodiments of the accompanying drawings. A person skilled in the art can make various variations of the present invention according to the above description. Therefore, certain details in the embodiments should not constitute a limitation of the present invention, and the scope of protection of the present invention shall be defined by the scope of the attached claims.

Claims

1. A method for opening the chamber under pressure during the solidification of muddy water shield tunneling under the river surface, which is used to adapt to the situation that the upper part of the shield machine forms a collapsed arch during the tunneling construction under the river surface, and to open the chamber under pressure during the shutdown of the shield machine, characterized in that: The pressure-opening construction method comprises the following steps: S1. Preparation; S2. Mud and water replacement in mud and water bin, including: S2.

1. Establish a mud-water replacement path: provide an electric locomotive to establish a replacement path from ground mixing of new slurry - electric locomotive - synchronous grouting bucket - mud-water bin - waste slurry treatment system; S2.2, two-stage replacement of mud and water in the silo: using viscous mud and clogging mud in turn to replace the mud and water in the silo twice according to the established mud and water replacement path, until the mud and water indicators discharged from the silo meet the standards; S3, mud flow solidification; S4. Open warehouse under pressure.

2. The riverbed mud shield slurry fluidization solidification pressure opening construction method according to claim 1 is characterized in that: The preparation work in step S1 includes the following steps: S1.1, hoop grouting: block the shield tail of the shield machine, and inject mud through the grouting holes around the shield machine to wrap the shield machine shell; S1.2, Clearing the warehouse under pressure: Enter the air cushion warehouse and mud water warehouse under pressure to remove the foreign matter accumulated at the bottom of the air cushion warehouse and mud water warehouse; S1.

3. Close the front gate: Close the front gate to isolate the air cushion tank and the mud and water tank.

3. The riverbed mud shield slurry flow solidification pressure opening construction method according to claim 2 is characterized in that: The preparation work in step S1 also includes the following steps: S1.

4. Maintenance of mud and water circulation system under normal pressure: Except for the mud and water bin, the mud discharge part of the shield machine circulation system should be cleared under normal pressure conditions.

4. The riverbed mud shield slurry fluid solidification pressure opening construction method according to claim 3 is characterized in that: The preparation work in step S1 also includes the following steps: S1.

5. Set up pipeline backwashing function: install multiple second ball valves on the pipeline inside the shield machine, set first pressure gauges on the second ball valves, and judge whether the pipelines between adjacent second ball valves are blocked by the values ​​of adjacent first pressure gauges, and provide a basis for pipeline backwashing and dredging; The pipeline backwashing and dredging is achieved by the clean water tank, extrusion pump, soil box and connecting pipelines. After the local blockage of the pipeline appears and is determined in the pipeline of the shield machine, the backwashing path of clean water tank-extrusion pump-the second ball valve of the pipeline in the shield machine-blocked pipeline-the second ball valve of the pipeline in the shield machine-soil box is formed under the action of the connecting pipeline, and the backwashing and dredging is achieved by starting the extrusion.

5. The riverbed mud shield slurry fluid solidification pressure opening construction method according to claim 1 is characterized in that: The fluidization solidification of the mud in step S3 includes the following steps: S3.

1. Establish a curing agent mixing system: provide curing agent mixing equipment, which is transported in by an electric locomotive. The slurry outlet of the curing agent mixing equipment is connected to the synchronous grouting bucket through the third slurry outlet pipe, and the slurry return outlet of the curing agent mixing equipment is connected to the mud and water replacement outlet of the mud and water bin through the return pipeline to form a circulatory passage; S3.2, Fluidized soil replacement in mud and water bin: The curing agent mixing equipment mixes the curing agent, and at the same time, it is sent into the mud and water bin along the mud and water replacement path through the synchronous grouting bucket to mix with the internal mud and water. The fluidized soil slurry in the bin formed by solidification flows back to the curing agent mixing equipment; S3.

3. Evaluate the fluid soil slurry index in the silo: At the mud-water replacement outlet of the silo, discharge the fluid soil slurry in the silo at regular intervals for measurement. If it does not meet the requirements, continue to add the curing agent. If it meets the requirements, stop; S3.

4. Graded pressurized penetration: The mud and water bin is pressurized in stages to allow the fluidized soil slurry in the bin to penetrate into the collapsed arch formed on the shield machine. During this period, the fluidized soil slurry in the bin is replenished to the mud and water bin in time until the collapsed arch on the shield machine is filled densely.

6. The method for riverbed mud shield slurry fluidization solidification and pressure opening construction according to claim 5 is characterized in that: Step S3.4 includes filling detection of the collapse arch while performing graded pressure infiltration; The filling detection of the collapsed arch includes setting a filling detector from the river surface drilling platform to a safe distance above the collapsed arch, performing filling detection inside the collapsed arch during graded pressurized infiltration, pulling out the filling detector after ensuring that the collapsed arch is filled densely, and simultaneously grouting to fill the channel formed by the filling detector.

7. The riverbed mud shield slurry fluidization solidification pressure opening construction method according to claim 6 is characterized in that: The pressure opening in step S4 includes the following steps: S4.

1. Confirmation of warehouse opening conditions: After the strength of the solidified soil formed by the solidification of the fluidized soil slurry in the warehouse reaches the standard, open the fourth ball valve at different parts of the chest plate of the mud and water warehouse to observe the water seepage. If the water seepage meets the requirements, the warehouse opening conditions are met; S4.

2. Clean the solidified soil in different areas: Workers use the man-room pressurization to enter the mud and water bunker, clean the solidified soil in the order of mud and water bunker-knife box-spoke opening-face plate, and then check the knives and replace them; S4.

3. Re-push after completion: Workers return to the man chamber to decompress, and simultaneously use new slurry to raise the liquid level inside the mud and water chamber through the mud and water replacement path. After the workers decompress and exit the chamber, the shield machine is re-pushed.

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