A TBM advanced curtain grouting technology

Abstract

The present invention belongs to the technical field of TBM advanced curtain grouting, and discloses a TBM advanced curtain grouting process, including the following steps: according to the distribution of cracks in the surrounding rock of the face, a rectangular groove is artificially excavated along the cracks, and the grooves on the front and both sides of the face are grooved. After the grooves are opened, a drainage pipe is punched to set a water inlet hole. The present invention adopts the method of starting the grooving operation from the top crack. After the grooving is completed, a drainage pipe is installed in the groove, and the concrete in the groove is filled. After the strength is reached, the butterfly valve of the drainage pipe is closed, and a hand-pneumatic drill is drilled at the crack in the groove to perform shallow grouting. At this point, the first crack is blocked, and the second crack is started. According to the above steps, the shallow water outflow of the face can be blocked. The advanced curtain grouting can be completed by grouting holes on the face, which can effectively block the groundwater that is bypassed by external water, so that the tunnel boring machine can be constructed normally, which greatly reduces the construction difficulty of the tunnel boring machine and improves the construction efficiency of the tunnel boring machine.

Description

Technical Field

[0001] The invention belongs to the technical field of TBM advanced curtain grouting, and in particular relates to a TBM advanced curtain grouting process. Background Art

[0002] TBM, or tunnel boring machine, is divided into open tunnel boring machines and shield tunnel boring machines. The construction processes such as excavation, support, and slag discharge are carried out in parallel and continuously. It is a factory-based assembly line tunnel construction equipment that integrates mechanical, electrical, hydraulic, optical, and gas systems. It has the advantages of fast excavation speed, environmental protection, and high comprehensive benefits. It can realize the construction of deep-buried long tunnels in complex geographical features that are difficult to achieve with traditional drilling and blasting methods.

[0003] When a tunnel boring machine enters a high-pressure water-rich tunnel section for construction, sudden water gushing may occur at the heading face at any time. Advance grouting must be carried out to block water before safe excavation can be carried out. The reserved positions for advance drilling of existing measures are around the front shield and the tail shield, and the hole is inclined outward at an angle of about 7°. Since the advance drilling of the front shield requires the installation of a drilling rig on the telescopic shield, the telescopic shield space is occupied by the main engine beam and the main push cylinder, and the drilling rig cannot be installed. The diffusion angle of the tail shield is too large, and the advance drilling cannot block the groundwater that is infiltrated by external water, making it impossible for the tunnel boring machine to operate normally, which greatly increases the construction difficulty of the tunnel boring machine and reduces the construction efficiency of the tunnel boring machine. Summary of the invention

[0004] The object of the present invention is to provide a TBM advanced curtain grouting process to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a TBM advanced curtain grouting process, comprising the following steps:

[0006] S1: According to the distribution of cracks in the surrounding rock of the tunnel face, rectangular grooves are artificially excavated along the cracks, including grooves on the front and both sides of the tunnel face;

[0007] S2: After grooving, punch holes in the drainage pipe to set the water inlet holes, arranged in a plum blossom shape; weld the middle The steel bar anchor hook is bent; the thread is processed at the tail end, and a DN200 butterfly valve is installed, and the butterfly valve is in the open state;

[0008] S3: Use a funnel to fill the concrete into the expansion groove. When the expansion groove is full, use a vibrating rod to assist and continue to fill the concrete until the concrete in the groove is filled densely, close the filling port and wait for setting;

[0009] S4: After the concrete setting strength reaches 90%, the covering steel plate can be removed and the butterfly valve of the drainage hole can be closed;

[0010] S5: Drill holes in the cracks in the slot with a hand drill. The drilling interval is 1m. Due to the limited space on the face, the depth is limited by using a 1m to 2.3m drill rod and the holes are replaced three times. The hole depth is 2.2m from the bottom of the slot, and the hole diameter is 50mm.

[0011] S6: Place the grouting plug at the designed grouting position in the hole, configure a high-pressure water pipe of sufficient length to extend to the hand pump outside the hole, configure a special valve, and inject water into the capsule. The water injection pressure makes the capsule expand and fit tightly against the hole wall. The maximum water injection pressure can reach 16Mpa. Different pressures can be used depending on the pressure-bearing capacity of the grouting plug.

[0012] S7: Carry out shallow grouting to achieve the purpose of blocking water in surface cracks;

[0013] S8: The drilling and grouting sequence of the tunnel face is to first drill a hole in the center of the water gushing area, and then seal the surrounding rock cracks from outside to outside and from shallow to deep. The grouting pressure greater than the water gushing head is used to push the slurry along the cracks to seal the water flow channels within a certain range around the tunnel face. The number of holes arranged on the tunnel face of this project is 17. The drilling sequence is arranged from small to large according to the grouting hole number. After the grouting is completed, 4 inspection holes are drilled. When there is no pressure water gushing out, excavation can continue (overlap length 5-10m);

[0014] S9: First, install the column frame on the tunnel face. The bottom and top of the column are provided with outer arc-shaped inner plane connecting plates. The outer arc is consistent with the curvature of the tunnel face. After being tightened by the oil cylinder, it is parallel to the cutterhead and tightened with the top rock surface by the bottom hydraulic support. The drilling rig support connecting rod is between the two columns. After the drilling rig is installed on the support connecting rod, the column frame and the drilling rig are connected by triangular support. It can slide up and down to the target position and then be fixed. The drilling rig is equipped with a device for fixing and disassembling the drill rod, a hydraulic propulsion device, and a device for supplying cooling water for drilling holes;

[0015] S10: Use the same bag-type high-pressure grouting plug as for shallow grouting. The grouting plug is placed 2m inside the hole. A sufficiently long high-pressure water pipe is configured to extend to the hand pump outside the hole. A special valve is configured to inject water into the capsule. The water pressure makes the capsule swell and fit tightly against the hole wall. After that, the valve at the interface of the water injection high-pressure pipe can be closed to maintain the pressure of the grouting plug capsule. The hand pump is removed, a special high-pressure valve is installed at the mouth of the grouting pipe, and the high-pressure grouting pipe is connected to start grouting and wait for the grouting to end.

[0016] Preferably, the method of using a funnel to fill concrete into the expanded groove, and when the expanded groove is full, using a vibrating rod to assist in filling and continue to fill concrete until the concrete in the groove is densely filled and the filling port is closed before setting, further includes the following steps:

[0017] S31: Use an impact drill to drill two rows of holes with a spacing of 100mm and a diameter of 20mm at an interval of 500mm in the slot. The holes are 100mm deep and arranged in a plum blossom shape. M16×140 expansion bolts are installed in the holes. The exposed parts of the bolts are wrapped with 12# lead wire and two 500mm lead wires are led out.

[0018] S32: Use the reinforcement to position the drainage pipe at the height of the crack inside the groove, with an interval of 1000mm. Use hemp thread to plug the front 100mm of the pipe tightly against the groove wall, and use the lead wire led out of the expansion screw to tie and fix the hemp thread;

[0019] S33: Pass the tail of the drain pipe through a 3mm thick steel plate to expose the butterfly valve.

[0020] Preferably, the rectangular groove has a size of 150 mm in width and 400 mm in depth.

[0021] Preferably, the drain pipe is made of a DN20 steel pipe, the drain pipe is 500 mm long, the water inlet hole is located 100 mm from the front end of the drain pipe, and the specifications of the water inlet hole are a hole diameter of 12 mm and a hole spacing of 30 mm.

[0022] Preferably, the grouting plug is 1 m in total length, the capsule part is 0.6 m in length, and has a diameter of 32 to 89 mm.

[0023] Preferably, the grouting material is a mixture of cement and water glass, the volume ratio of the cement slurry to the water glass is 1:1, and the mass ratio of the cement slurry to the water glass is 1:4.

[0024] Preferably, the use of the same bag-type water-injected high-pressure grouting plug as that of shallow grouting is described, the grouting plug is placed 2m into the hole, a sufficiently long high-pressure water pipe is configured to extend to a hand pump outside the hole, a special valve is configured, water is injected into the capsule, the water pressure causes the capsule to swell and fit tightly against the hole wall, then the valve at the interface of the water injection high-pressure pipe can be closed to maintain the pressure of the grouting plug capsule, the hand pump is removed, a special high-pressure valve is installed at the grouting pipe outlet, the high-pressure grouting pipe is connected, grouting begins, and before waiting for the grouting to end, the following steps are also included:

[0025] S101: Drill a hole in the center of the face, install the central rotation axis of the column frame, and add a drilling rig symmetrically on the column frame. When changing holes, just retract the upper and lower cylinders of the column frame to rotate the column frame to a specified angle, then extend the cylinders, fix the column frame, and slide the drilling rig platform up and down along the column frame to simultaneously position two drilling rigs for drilling.

[0026] Preferably, the use of the same bag-type water-injected high-pressure grouting plug as that of shallow grouting, the grouting plug is placed 2m inside the hole, a sufficiently long high-pressure water pipe is provided to extend to a hand pump outside the hole, a special valve is provided, water is injected into the capsule, the water pressure causes the capsule to swell and fit tightly against the hole wall, then the valve at the interface of the water injection high-pressure pipe can be closed to maintain the pressure of the grouting plug capsule, the hand pump is removed, a special high-pressure valve is installed at the mouth of the grouting pipe, the high-pressure grouting pipe is connected, grouting begins, and after waiting for the grouting to be completed, the following steps are also included:

[0027] S102: When the grouting is finished, close the valve and wait for solidification for 12 hours, open the grouting valve to check whether the slurry is solidified, open the high-pressure water injection pipe interface valve on the capsule bag, and the capsule can be taken out and reused after the pressure is released.

[0028] Preferably, the shallow grouting to achieve the purpose of surface fissure water blocking also includes the following steps:

[0029] S71: The holes are arranged at an interval of 1m in the trench, and the number of shallow water-blocking holes is 45 in total. The maximum grouting pressure is 3.5Mpa based on the maximum head pressure of 350m at the groundwater level. The grouting pressure is 1.5 times greater than the groundwater pressure. The planned maximum grouting pressure is 3.5*1.5=5.25Mpa.

[0030] Preferably, after passing the tail of the drain pipe through a 3 mm thick steel plate to expose the butterfly valve, the method further includes the following steps:

[0031] S34: The steel plate is 300mm wide and covers the expansion groove. The edge is fastened to the rock surface with M16×140 expansion bolts at intervals of 500mm. A 70×200 high concrete feeding port is reserved in the upper half of the expansion groove at a spacing of 1m along the covering steel plate.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The present invention starts the trenching operation from the topmost fissure. After the trenching is completed, a drainage pipe is installed in the trench, and the trench is filled with concrete. After the trench is solidified to reach a certain strength, the butterfly valve of the drainage pipe is closed, and a hand drill is used to drill holes at the fissures in the trench to perform shallow grouting. At this point, the first fissure is blocked and the second fissure is started. According to the above steps, the shallow water outflow of the heading face can be blocked. By grouting holes on the heading face, advanced curtain grouting can be completed, which can effectively block the groundwater that is infiltrated by external water, so that the tunnel boring machine can operate normally, which greatly reduces the construction difficulty of the tunnel boring machine and improves the construction efficiency of the tunnel boring machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] See also Figure 1As shown, the present invention provides the following technical solution: a TBM advanced curtain grouting process, comprising the following steps:

[0037] S1: According to the distribution of cracks in the surrounding rock of the tunnel face, rectangular grooves are artificially excavated along the cracks, including grooves on the front and both sides of the tunnel face;

[0038] S2: After grooving, punch holes in the drainage pipe to set the water inlet holes, arranged in a plum blossom shape; weld the middle The steel bar anchor hook is bent; the thread is processed at the tail end, and a DN200 butterfly valve is installed, and the butterfly valve is in the open state;

[0039] S3: Use a funnel to fill the concrete into the expansion groove. When the expansion groove is full, use a vibrating rod to assist and continue to fill the concrete until the concrete in the groove is filled densely, close the filling port and wait for setting;

[0040] S4: After the concrete setting strength reaches 90%, the covering steel plate can be removed and the butterfly valve of the drainage hole can be closed;

[0041] S5: Drill holes in the cracks in the slot with a hand drill. The drilling interval is 1m. Due to the limited space on the face, the depth is limited by using a 1m to 2.3m drill rod and the holes are replaced three times. The hole depth is 2.2m from the bottom of the slot, and the hole diameter is 50mm.

[0042] S6: Place the grouting plug at the designed grouting position in the hole, configure a high-pressure water pipe of sufficient length to extend to the hand pump outside the hole, configure a special valve, and inject water into the capsule. The water injection pressure makes the capsule expand and fit tightly against the hole wall. The maximum water injection pressure can reach 16Mpa. Different pressures can be used depending on the pressure-bearing capacity of the grouting plug.

[0043] S71: The holes are arranged at intervals of 1m in the trench, and the number of shallow water plugging holes is 45 in total. The maximum grouting pressure is 3.5Mpa based on the maximum head pressure of 350m at the groundwater level. The grouting pressure is 1.5 times greater than the groundwater pressure. The proposed maximum grouting pressure is 3.5*1.5=5.25Mpa;

[0044] S7: Carry out shallow grouting to achieve the purpose of blocking water in surface cracks;

[0045] S8: The drilling and grouting sequence of the tunnel face is to first drill a hole in the center of the water gushing area, and then seal the surrounding rock cracks from outside to outside and from shallow to deep. The grouting pressure greater than the water gushing head is used to push the slurry along the cracks to seal the water flow channels within a certain range around the tunnel face. The number of holes arranged on the tunnel face of this project is 17. The drilling sequence is arranged from small to large according to the grouting hole number. After the grouting is completed, 4 inspection holes are drilled. When there is no pressure water gushing out, excavation can continue (overlap length 5-10m);

[0046] S9: First, install the column frame on the tunnel face. The bottom and top of the column are provided with outer arc-shaped inner plane connecting plates. The outer arc is consistent with the curvature of the tunnel face. After being tightened by the oil cylinder, it is parallel to the cutterhead and tightened with the top rock surface by the bottom hydraulic support. The drilling rig support connecting rod is between the two columns. After the drilling rig is installed on the support connecting rod, the column frame and the drilling rig are connected by triangular support. It can slide up and down to the target position and then be fixed. The drilling rig is equipped with a device for fixing and disassembling the drill rod, a hydraulic propulsion device, and a device for supplying cooling water for drilling holes;

[0047] S101: Drill a hole in the center of the face, install the central rotation axis of the column frame, and add a drilling rig symmetrically on the column frame. When changing holes, just retract the upper and lower cylinders of the column frame to rotate the column frame to a specified angle, then extend the cylinders, fix the column frame, and slide the drilling rig platform up and down along the column frame. Two drilling rigs can be positioned at the same time for drilling;

[0048] S10: Use the same high-pressure grouting plug with water injection as for shallow grouting. The grouting plug is placed 2m inside the hole. A high-pressure water pipe of sufficient length is configured to extend to the hand pump outside the hole. A special valve is configured. Water is injected into the capsule. The water pressure makes the capsule swell and fit tightly against the hole wall. After that, the valve at the interface of the water injection high-pressure pipe can be closed to maintain the pressure of the grouting plug capsule. The hand pump is removed, a special high-pressure valve is installed at the grouting pipe outlet, and the high-pressure grouting pipe is connected. Grouting starts and the grouting is waited for to be completed.

[0049] S102: When the grouting is finished, close the valve and wait for solidification for 12 hours, open the grouting valve to check whether the slurry is solidified, open the high-pressure water injection pipe interface valve on the capsule bag, and the capsule can be taken out and reused after the pressure is released.

[0050] Embodiment 2: A TBM advanced curtain grouting process, comprising the following steps:

[0051] S1: According to the distribution of cracks in the surrounding rock of the face, rectangular grooves are artificially excavated along the cracks (the size of the rectangular groove is 150mm wide and 400mm deep), and grooves are made on the front and both sides of the face;

[0052] S2: After grooving, punch holes in the drain pipe to set water inlet holes (the drain pipe is made of DN20 steel pipe, the drain pipe is 500mm long, the water inlet hole is located 100mm from the front end of the drain pipe, and the water inlet hole specification is 12mm in diameter and 30mm in hole spacing), arranged in plum blossom shape; weld the middle The steel bar anchor hook is bent; the thread is processed at the tail end, and a DN200 butterfly valve is installed, and the butterfly valve is in the open state;

[0053] S31: Use an impact drill to drill two rows of holes with a spacing of 100mm and a diameter of 20mm at an interval of 500mm in the slot. The holes are 100mm deep and arranged in a plum blossom shape. M16×140 expansion bolts are installed in the holes. The exposed parts of the bolts are wrapped with 12# lead wire and two 500mm lead wires are led out.

[0054] S32: Use the reinforcement to position the drainage pipe at the height of the crack inside the groove, with an interval of 1000mm. Use hemp thread to plug the front 100mm of the pipe tightly against the groove wall, and use the lead wire led out of the expansion screw to tie and fix the hemp thread;

[0055] S33: Pass the tail of the drain pipe through the 3mm thick steel plate to expose the butterfly valve;

[0056] S34: The steel plate is 300mm wide and covers the expansion groove. The edge is fixed to the rock surface with M16×140 expansion bolts at intervals of 500mm. A concrete feeding port with a height of 70×length of 200 is reserved in the upper half of the expansion groove along the covering steel plate at a spacing of 1m;

[0057] S3: Use a funnel to fill the concrete into the expansion groove. When the expansion groove is full, use a vibrating rod to assist and continue to fill the concrete until the concrete in the groove is filled densely, close the filling port and wait for setting;

[0058] S4: After the concrete setting strength reaches 90%, the covering steel plate can be removed and the butterfly valve of the drainage hole can be closed;

[0059] S5: Drill holes in the cracks in the slot with a hand drill. The drilling interval is 1m. Due to the limited space on the face, the depth is limited by using a 1m to 2.3m drill rod and the holes are replaced three times. The hole depth is 2.2m from the bottom of the slot, and the hole diameter is 50mm.

[0060] S6: Place the grouting plug (the total length of the grouting plug is 1m, the capsule part is 0.6m long, and the diameter is 32-89mm) at the designed grouting position in the hole, configure a sufficiently long high-pressure water pipe to extend to the hand pump outside the hole, configure a special valve, and inject water into the capsule. The water injection pressure makes the capsule expand and fit tightly against the hole wall. The maximum water injection pressure can reach 16Mpa. Different pressures can be taken depending on the pressure-bearing capacity of the grouting plug;

[0061] S71: The holes are arranged at intervals of 1m in the trench, and the number of shallow water plugging holes is 45 in total. The maximum grouting pressure is 3.5Mpa based on the maximum head pressure of 350m at the groundwater level. The grouting pressure is 1.5 times greater than the groundwater pressure. The proposed maximum grouting pressure is 3.5*1.5=5.25Mpa;

[0062] S7: Carry out shallow grouting to achieve the purpose of blocking water in surface cracks;

[0063] S8: The drilling and grouting sequence of the tunnel face is to first drill a hole in the center of the water gushing area, and then seal the surrounding rock cracks from outside to outside and from shallow to deep. The grouting pressure greater than the water gushing head is used to push the slurry along the cracks to seal the water flow channels within a certain range around the tunnel face. The number of holes arranged on the tunnel face of this project is 17. The drilling sequence is arranged from small to large according to the grouting hole number. After the grouting is completed, 4 inspection holes are drilled. When there is no pressure water gushing out, excavation can continue (overlap length 5-10m);

[0064] S9: First, install the column frame on the tunnel face. The bottom and top of the column are provided with outer arc-shaped inner plane connecting plates. The outer arc is consistent with the curvature of the tunnel face. After being tightened by the oil cylinder, it is parallel to the cutterhead and tightened with the top rock surface by the bottom hydraulic support. The drilling rig support connecting rod is between the two columns. After the drilling rig is installed on the support connecting rod, the column frame and the drilling rig are connected by triangular support. It can slide up and down to the target position and then be fixed. The drilling rig is equipped with a device for fixing and disassembling the drill rod, a hydraulic propulsion device, and a device for supplying cooling water for drilling holes;

[0065] S101: Drill a hole in the center of the face, install the central rotation axis of the column frame, and add a drilling rig symmetrically on the column frame. When changing holes, just retract the upper and lower cylinders of the column frame to rotate the column frame to a specified angle, then extend the cylinders, fix the column frame, and slide the drilling rig platform up and down along the column frame. Two drilling rigs can be positioned at the same time for drilling;

[0066] S10: Use the same high-pressure grouting plug with water injection as for shallow grouting. The grouting plug is placed 2m inside the hole. A high-pressure water pipe of sufficient length is configured to extend to the hand pump outside the hole. A special valve is configured. Water is injected into the capsule. The water pressure makes the capsule swell and fit tightly against the hole wall. After that, the valve at the interface of the water injection high-pressure pipe can be closed to maintain the pressure of the grouting plug capsule. The hand pump is removed, a special high-pressure valve is installed at the grouting pipe outlet, and the high-pressure grouting pipe is connected. Grouting starts and the grouting is waited for to be completed.

[0067] S102: When the grouting is finished, close the valve and wait for solidification for 12 hours, open the grouting valve to check whether the slurry is solidified, open the high-pressure water injection pipe interface valve on the capsule bag, and the capsule can be taken out and reused after the pressure is released.

[0068] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0069] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A TBM advanced curtain grouting process, characterized in that: The following steps are involved: S1: According to the distribution of cracks in the surrounding rock of the tunnel face, rectangular grooves are artificially excavated along the cracks, including grooves on the front and both sides of the tunnel face; S2: After grooving, punch holes in the drainage pipe to set the water inlet holes, arranged in a plum blossom shape; weld the middle The steel bar anchor hook is bent; the thread is processed at the tail end, and a DN200 butterfly valve is installed, and the butterfly valve is in the open state; S3: Use a funnel to fill the concrete into the expansion groove. When the expansion groove is full, use a vibrating rod to assist and continue to fill the concrete until the concrete in the groove is filled densely, close the filling port and wait for setting; S4: After the concrete setting strength reaches 90%, the covering steel plate can be removed and the butterfly valve of the drainage hole can be closed; S5: Drill holes in the cracks in the slot with a hand drill. The drilling interval is 1m. Due to the limited space on the face, the depth is limited by using a 1m to 2.3m drill rod and the holes are replaced three times. The hole depth is 2.2m from the bottom of the slot, and the hole diameter is 50mm. S6: Place the grouting plug at the designed grouting position in the hole, configure a high-pressure water pipe of sufficient length to extend to the hand pump outside the hole, configure a special valve, and inject water into the capsule. The water injection pressure makes the capsule expand and fit tightly against the hole wall. The maximum water injection pressure can reach 16Mpa. Different pressures can be used depending on the pressure-bearing capacity of the grouting plug. S7: Carry out shallow grouting to achieve the purpose of blocking water in surface cracks; S8: The drilling and grouting sequence of the tunnel face is to first drill a hole in the center of the water gushing area, and then seal the surrounding rock cracks from outside to outside and from shallow to deep. The grouting pressure greater than the water gushing head is used to push the slurry along the cracks to seal the water flow channels within a certain range around the tunnel face. The number of holes arranged on the tunnel face of this project is 17. The drilling sequence is arranged from small to large according to the grouting hole number. After the grouting is completed, 4 inspection holes are drilled. When there is no pressure water gushing out, excavation can continue (overlap length 5-10m); S9: First, install the column frame on the tunnel face. The bottom and top of the column are provided with outer arc-shaped inner plane connecting plates. The outer arc is consistent with the curvature of the tunnel face. After being tightened by the oil cylinder, it is parallel to the cutterhead and tightened with the top rock surface by the bottom hydraulic support. The drilling rig support connecting rod is between the two columns. After the drilling rig is installed on the support connecting rod, the column frame and the drilling rig are connected by triangular support. It can slide up and down to the target position and then be fixed. The drilling rig is equipped with a device for fixing and disassembling the drill rod, a hydraulic propulsion device, and a device for supplying cooling water for drilling holes; S10: Use the same bag-type high-pressure grouting plug as for shallow grouting. The grouting plug is placed 2m inside the hole. A sufficiently long high-pressure water pipe is configured to extend to the hand pump outside the hole. A special valve is configured to inject water into the capsule. The water pressure makes the capsule swell and fit tightly against the hole wall. After that, the valve at the interface of the water injection high-pressure pipe can be closed to maintain the pressure of the grouting plug capsule. The hand pump is removed, a special high-pressure valve is installed at the mouth of the grouting pipe, and the high-pressure grouting pipe is connected to start grouting and wait for the grouting to end.

2. A TBM advanced curtain grouting process according to claim 1, characterized in that: The method of using a funnel to fill concrete into the expanded groove, and when the expanded groove is filled, using a vibrating rod to assist in filling and continue to fill concrete until the concrete in the groove is filled densely and the filling port is closed before setting, also includes the following steps: S31: Use an impact drill to drill two rows of holes with a spacing of 100mm and a diameter of 20mm at an interval of 500mm in the slot. The holes are 100mm deep and arranged in a plum blossom shape. M16×140 expansion bolts are installed in the holes. The exposed parts of the bolts are wrapped with 12# lead wire and two 500mm lead wires are led out. S32: Use the reinforcement to position the drainage pipe at the height of the crack inside the groove, with an interval of 1000mm. Use hemp thread to plug the front 100mm of the pipe tightly against the groove wall, and use the lead wire led out of the expansion screw to tie and fix the hemp thread; S33: Pass the tail of the drain pipe through a 3mm thick steel plate to expose the butterfly valve.

3. A TBM advanced curtain grouting process according to claim 1, characterized in that: The dimensions of the rectangular groove are 150 mm in width and 400 mm in depth.

4. A TBM advanced curtain grouting process according to claim 1, characterized in that: The drain pipe is made of a DN20 steel pipe, the drain pipe is 500 mm long, the water inlet hole is located 100 mm from the front end of the drain pipe, and the specifications of the water inlet hole are a hole diameter of 12 mm and a hole spacing of 30 mm.

5. The TBM advanced curtain grouting process according to claim 1, characterized in that: The grouting plug has a total length of 1 m, a capsule part of 0.6 m in length, and a diameter of 32 to 89 mm.

6. A TBM advanced curtain grouting process according to claim 1, characterized in that: The grouting material is a mixture of cement and water glass, the volume ratio of the cement slurry to the water glass is 1:1, and the mass ratio of the cement slurry to the water glass is 1:

4.

7. A TBM advanced curtain grouting process according to claim 1, characterized in that: The method uses the same bag-type high-pressure grouting plug as the shallow grouting. The grouting plug is placed 2m inside the hole, and a sufficiently long high-pressure water pipe is provided to extend to the hand pump outside the hole. A special valve is provided, and water is injected into the capsule. The water pressure makes the capsule swell and adhere to the hole wall. After that, the valve at the interface of the water injection high-pressure pipe can be closed to maintain the pressure of the grouting plug capsule. The hand pump is removed, and a special high-pressure valve is installed at the grouting pipe mouth. The high-pressure grouting pipe is connected to start grouting. Before waiting for the grouting to end, the following steps are also included: S101: Drill a hole in the center of the face, install the central rotation axis of the column frame, and add a drilling rig symmetrically on the column frame. When changing holes, just retract the upper and lower cylinders of the column frame to rotate the column frame to a specified angle, then extend the cylinders, fix the column frame, and slide the drilling rig platform up and down along the column frame to simultaneously position two drilling rigs for drilling.

8. The TBM advanced curtain grouting process according to claim 1, characterized in that: The method uses the same bag-type water-injected high-pressure grouting plug as the shallow grouting. The grouting plug is placed 2m inside the hole, and a sufficiently long high-pressure water pipe is configured to extend to a hand pump outside the hole. A special valve is configured, and water is injected into the capsule. The water pressure causes the capsule to swell and fit closely to the hole wall. After that, the valve at the interface of the water injection high-pressure pipe can be closed to maintain the pressure of the grouting plug capsule. The hand pump is removed, a special high-pressure valve is installed at the grouting pipe outlet, and the high-pressure grouting pipe is connected to start grouting. After waiting for the grouting to be completed, the following steps are also included: S102: When the grouting is finished, close the valve and wait for solidification for 12 hours, open the grouting valve to check whether the slurry is solidified, open the high-pressure water injection pipe interface valve on the capsule bag, and the capsule can be taken out and reused after the pressure is released.

9. The TBM advanced curtain grouting process according to claim 1, characterized in that: The shallow grouting method further includes the following steps before achieving the purpose of blocking water in surface fissures: S71: The holes are arranged at an interval of 1m in the trench, and the number of shallow water-blocking holes is 45 in total. The maximum grouting pressure is 3.5Mpa based on the maximum head pressure of 350m at the groundwater level. The grouting pressure is 1.5 times greater than the groundwater pressure. The planned maximum grouting pressure is 3.5*1.5=5.25Mpa.

10. The TBM advanced curtain grouting process according to claim 1, characterized in that: The method of passing the tail of the drainage pipe through the 3mm thick steel plate to expose the butterfly valve also includes the following steps: S34: The steel plate is 300mm wide and covers the expansion groove. The edge is fastened to the rock surface with M16×140 expansion bolts at intervals of 500mm. A 70×200 high concrete feeding port is reserved in the upper half of the expansion groove at a spacing of 1m along the covering steel plate.

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