A method for reinforcing ground when a shield machine passes through an existing water tunnel

Abstract

The present application relates to a method for reinforcing the ground for a shield machine to pass through an existing water tunnel, and relates to the field of shield ground reinforcement technology, comprising the following steps: a. According to the design drawings, a plurality of spaced conductive reinforcement holes are vertically set on both sides of the water tunnel to be traversed by reinforcement equipment, and cement slurry is poured into the conductive reinforcement holes to form a shear force conduction reinforcement zone between the water tunnel and the shield tunnel; b. According to the design drawings, a plurality of spaced horizontal reinforcement holes are set at the bottom of the water tunnel to be traversed by reinforcement equipment, and the horizontal reinforcement holes are connected to the conductive reinforcement holes on both sides of the water tunnel, and cement slurry is poured into the horizontal reinforcement holes to form a flow-blocking and anti-interference reinforcement zone between the water tunnel and the shield tunnel. After the reinforcement is completed, the shield machine can pass through the water tunnel. The present application has the advantage of being able to avoid damage to the existing water tunnel during shield construction.

Description

Technical Field

[0001] The present application relates to the field of shield ground reinforcement technology, and in particular to a ground reinforcement method for a shield machine passing through an existing water conveyance tunnel. Background Art

[0002] With the rapid development of my country's economy, underground rail transit has developed more and more rapidly. In my country's urban underground rail transit construction projects, different construction methods are adopted according to the geological conditions. In some large-section and variable-section areas, mining method is generally used for construction. Since the mining method has low construction efficiency and shield construction progress is faster, shield method is usually used for construction of long and large standard-section tunnels.

[0003] Since underground rail transit tunnels are generally located in the main urban areas of the city, shield machines will inevitably cross some existing lines when they are excavating. The construction of shield tunnels is bound to cause disturbance of the surrounding soil. Therefore, the shield machine is likely to cause greater soil disturbance around the existing pipelines it passes through. Especially when the shield machine excavates through the water diversion tunnel, it will generate greater shear force on the surrounding soil or rock mass, which is likely to cause cracking and settlement problems in the existing water diversion tunnel, and then easily lead to water seepage and leakage in the transmission tunnel, which not only damages the original transmission tunnel pipeline, but also poses a greater safety hazard to the shield construction. Summary of the Invention

[0004] In order to avoid damage to the existing water tunnel during shield construction, the present application provides a stratum reinforcement method for a shield machine passing through an existing water tunnel.

[0005] This application provides a method for reinforcing the ground when a shield machine passes through an existing water diversion tunnel, which adopts the following technical solutions:

[0006] A method for reinforcing a stratum when a shield machine passes through an existing water conveyance tunnel, characterized by comprising the following steps:

[0007] a. According to the design drawings, multiple spaced conductive reinforcement holes are vertically set on both sides of the water tunnel to be penetrated using reinforcement equipment. Cement slurry is poured into the conductive reinforcement holes to form a shear force conductive reinforcement zone between the water tunnel and the shield tunnel;

[0008] b. According to the design drawings, multiple horizontal reinforcement holes are set at intervals at the bottom of the water tunnel to be penetrated using reinforcement equipment. The horizontal reinforcement holes are connected to the conductive reinforcement holes on both sides of the water tunnel. Cement slurry is poured into the horizontal reinforcement holes to form a flow-blocking and anti-interference reinforcement zone between the water tunnel and the shield tunnel. After the reinforcement is completed, the shield tunnel can be penetrated under the water tunnel.

[0009] By adopting the above technical solution, the reinforcement method of the present application provides shear force conduction reinforcement zones on both sides of the water transfer tunnel, thereby reinforcing the shallow soil on both sides of the water transfer tunnel. When shield construction is carried out under the water transfer tunnel, the shield machine causes a large shear force on the soil around the water transfer tunnel. When the shear force is generated, the cement columns in the shear force conduction reinforcement zone conduct the large shear force to the outside of the ground through the cement columns, thereby reducing the shear force generated by the soil or rock mass around the water transfer tunnel, thereby avoiding cracking of the water transfer tunnel and sinking. By setting up a flow-blocking and anti-disturbance reinforcement zone at the bottom of the water tunnel, when the shield machine causes a large disturbance to the soil at the bottom of the water tunnel, the cement slurry reinforcement plane formed by the flow-blocking and anti-disturbance reinforcement zone can prevent the disturbance from being transmitted in the direction of the conveying tunnel, thereby avoiding the problem of cracking and settlement of the water tunnel. Once the water tunnel has seepage or leakage problems, the cement slurry reinforcement plane formed by the flow-blocking and anti-disturbance reinforcement zone can also prevent the leaked water from flowing into the shield construction area, thereby ensuring the quality and safety of the construction. By setting up a shear conduction reinforcement zone and a flow-blocking and anti-disturbance reinforcement zone to reinforce the soil or rock mass around the water tunnel, the problem of cracking and settlement of the existing water tunnel caused by the shield construction process is reduced. On the one hand, it can avoid damage to the original water tunnel, and on the other hand, it can reduce safety hazards during the shield construction process.

[0010] Optionally, the reinforcement equipment includes a walking device, a reaming device and a drilling device, the walking device includes a mounting plate, a first cylinder, a walking support plate and a second cylinder, a plurality of first cylinders are provided, and the plurality of first cylinders are evenly spaced along the circumference of the mounting plate, a cylinder body of the first cylinder is fixedly connected to the mounting plate, a plurality of walking support plates are provided, and the walking support plates and the first cylinders are installed in a one-to-one correspondence, the walking support plate is fixedly connected to the piston rod of the first cylinder, and the cylinder body of the second cylinder is fixedly connected to the mounting plate;

[0011] The reaming device is connected to the piston rod of the second cylinder, and is used to expand and compact the hole wall of the reinforcement hole. The drilling device is connected to the reaming device, and is used to drill holes.

[0012] By adopting the above technical solution, during the processing and construction process, a drilling device is used to drill conductive reinforcement holes and horizontal reinforcement holes around the water conveyance tunnel. During the drilling process, the hole wall of the reinforcement hole is expanded and compacted by the hole expanding device, and then the walking device drives the reinforcement equipment to feed forward as a whole. During feeding, the piston rod of the first cylinder contracts, thereby driving the walking support plate to separate from the hole wall of the reinforcement hole, and then the piston rod of the second cylinder contracts, thereby driving the mounting plate to feed forward, and then driving the first cylinder and the walking support plate to feed forward. After feeding a certain distance, the first cylinder extends, thereby driving the walking support plate to press against the hole wall of the reinforcement hole. Conductive reinforcement holes and horizontal reinforcement holes are processed in the foundation through the above-mentioned reinforcement equipment, which facilitates the subsequent feeding and pouring of cement slurry, thereby forming a shear force conduction reinforcement area and a flow blocking and anti-interference reinforcement area, thereby reducing the problem of cracking and settlement of the existing water conveyance tunnel that is easily caused during shield construction.

[0013] Optionally, the reaming device includes a reaming disk, a third cylinder and a reaming plate, the reaming disk is connected to the second cylinder, the third cylinder is provided with multiple third cylinders, and the multiple third cylinders are evenly distributed along the circumference of the reaming disk, the cylinder body of the third cylinder is fixedly connected to the reaming disk, and the reaming plate is fixedly connected to the piston rod of the third cylinder.

[0014] By adopting the above technical solution, during the drilling process, the third cylinder is started, and the third cylinder drives the reaming plate to press against the drilled hole wall. During the feeding process of the drilling device, the reaming plate squeezes the soil generated by the drilling toward the hole wall. As the reaming device feeds forward, the reaming plate can squeeze the drilled hole wall into shape, thereby forming a hole wall chamber and a structurally stable reinforcement hole, which is convenient for subsequent pouring of cement slurry and is conducive to forming a structurally stable reinforcement area.

[0015] Optionally, the drilling device includes a drill bit and a driving member, the drill bit and the reaming disk are rotatably connected on the side away from the walking assembly, the drill bit and the reaming disk are rotatably connected, the driving member is used to drive the drill bit to rotate, and a spiral feed blade is fixedly connected to the drill bit.

[0016] By adopting the above technical solution, during drilling construction, a driving member is used to drive the drill bit to rotate, and when the drill bit rotates, it drives the spiral feed blade to dig the soil, thereby processing a channel. The circumferential reaming plates of the reaming disk can compact and reinforce the inner wall of the channel, thereby improving the stability of the reinforced hole and avoiding the problem of shrinkage and collapse, which is conducive to forming a structurally stable reinforcement area and reducing the problem of cracking and settlement of the existing water transfer tunnel that is easily caused during shield construction.

[0017] Optionally, the driving member includes a motor, a gear and a gear ring, the housing of the motor is fixedly connected to the reaming disk, the gear is fixedly connected to the output shaft of the motor, the gear ring is fixedly connected to the drill bit, and the gear ring is meshed with the gear.

[0018] By adopting the above technical solution, during drilling construction, the motor is started, and the output shaft of the motor drives the gear to rotate. When the gear rotates, it drives the gear ring to rotate. When the gear ring rotates, it drives the drill bit engaged with it to rotate, thereby completing the drilling operation. The above-mentioned driving member has the advantages of smooth transmission and high transmission efficiency, which can reduce the vibration generated during the drilling process, thereby avoiding the problem of shrinkage and collapse of the drilled hole.

[0019] Optionally, the reaming device further includes a guide ring, one end of which is fixedly connected to the drill bit and the other end of which is in contact with the reaming plate.

[0020] By adopting the above technical solution and setting a guide ring, the soil debris generated by drilling flows to the circumference of the hole wall through the guide plate, and then the hole wall is squeezed and compacted by the expansion plate. Therefore, the hole wall can be squeezed and compacted while drilling, which is beneficial to improving the work efficiency during reinforcement construction.

[0021] Optionally, the reinforcement equipment also includes a grouting hose, one end of which passes through the mounting plate and the reaming plate in sequence and is connected to the drill bit, a cavity for grouting is provided in the drill bit, one end of the grouting hose is connected to the cavity, and a plurality of grouting holes connected to the cavity are provided on the drill bit.

[0022] By adopting the above technical solution, by setting up a grouting hose, after the drill bit drills the hole, cement slurry is poured into the hole through the grouting hose. While pouring the cement slurry, the walking device gradually drives the reinforcement equipment as a whole to move outside the hole. At the same time, when the drill bit rotates, the cement slurry poured into the hole is stirred by the spiral feed blade, so that the cement slurry is fully filled into the hole, which is conducive to forming a structurally stable reinforcement area. The above structure can complete the grouting operation when the reinforcement equipment exits the reinforcement hole, avoiding the problem of easy collapse of the hole during the second grouting, and there is no need to reinforce the drilled hole, which reduces the construction cost and can effectively improve the work efficiency of the reinforcement construction.

[0023] Optionally, the drill bit is provided with a sealing part at the grouting hole, the sealing part includes a torsion spring and a sealing plate, the grouting hole is a T-shaped hole, the sealing plate is buckled on the grouting hole, the sealing plate is hinged to the grouting hole, the torsion spring is located at the hinge between the sealing plate and the drill bit, and the torsion spring makes the sealing plate tend to rotate toward the side close to the conveying drill bit.

[0024] By adopting the above technical solution and setting up a sealing piece, during the drilling operation, the sealing piece will close the sealing hole under the action of the torsion spring, thereby preventing the debris generated by the drilling from entering the cavity. When the grouting operation is performed, the high-pressure slurry will flush the sealing piece open, and the grouting operation can be carried out.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. This application reinforces the soil or rock mass around the water tunnel by providing shear force conduction reinforcement zones and flow blocking and anti-disturbance reinforcement zones. This reduces the risk of cracking and settlement of the existing water tunnel during shield construction. This not only avoids damage to the existing water tunnel, but also reduces safety hazards during shield construction.

[0027] 2. This application uses reinforcement equipment to perform drilling and grouting operations, which can form a complete shear force conduction reinforcement area and a flow obstruction and anti-disturbance reinforcement area in one construction. This avoids the problem of easy collapse of the channel during secondary grouting and eliminates the need to reinforce the drilled channel, thereby reducing construction costs and effectively improving the efficiency of reinforcement construction.

[0028] 3. This application uses reinforcement equipment to perform drilling operations. During the feeding process of the drilling device, the reaming plate squeezes the soil generated by drilling toward the hole wall. As the reaming device feeds forward, the reaming plate can compact and shape the drilled hole wall, thereby forming a hole wall chamber and a structurally stable reinforcement hole, which is convenient for subsequent pouring of cement slurry and is conducive to forming a structurally stable reinforcement area. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the construction structure of a method for reinforcing a stratum by using a shield machine to pass through an existing water diversion tunnel according to an embodiment of the present application;

[0030] Figure 2 This is a schematic diagram of the overall structure of a reinforcement device used in a ground reinforcement method for a shield machine passing through an existing water conveyance tunnel according to an embodiment of the present application;

[0031] Figure 3 Schematic diagram of the structure of the drill bit and the driving member of the reinforcement device of the embodiment of the present application;

[0032] Figure 4 is a cross-sectional view of a drill bit of a reinforcement device according to an embodiment of the present application;

[0033] Figure 5 yes Figure 4 Magnified view of section A.

[0034] Figure numerals: 1. conduction reinforcement hole; 11. shear conduction reinforcement area; 2. horizontal reinforcement hole; 21. flow-blocking and anti-disturbance reinforcement area; 3. walking device; 31. mounting plate; 32. first cylinder; 33. walking support plate; 34. second cylinder; 4. reaming device; 41. reaming plate; 42. third cylinder; 43. reaming plate; 431. transition section; 5. drilling device; 51. drill bit; 511. mounting rod; 512. guide ring; 513. cavity; 514. grouting hole; 515. sealing plate; 516. torsion spring; 517. spiral feed blade; 52. driving part; 521. motor; 522. gear; 523. gear ring; 6. grouting hose; 7. water supply tunnel. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-5 This application is further described in detail.

[0036] The embodiment of the present application discloses a method for reinforcing the ground when a shield machine passes through an existing water tunnel. Figure 1 A method for reinforcing a stratum when a shield machine passes through an existing water conveyance tunnel 7 comprises the following steps:

[0037] a. According to the design drawings, multiple conductive reinforcement holes 1 are vertically arranged at intervals on both sides of the water tunnel 7 to be traversed using reinforcement equipment. Cement slurry is poured into the conductive reinforcement holes 1 using the reinforcement equipment to form a shear force conductive reinforcement zone 11 between the water tunnel 7 and the shield tunnel;

[0038] b. According to the design drawings, multiple horizontal reinforcement holes 2 are set at intervals at the bottom of the water tunnel 7 to be penetrated using reinforcement equipment. The horizontal reinforcement holes 2 are connected to the conductive reinforcement holes 1 on both sides of the water tunnel 7. Cement slurry is poured into the horizontal reinforcement holes 2 to form a flow-blocking and anti-disturbance reinforcement area 21 between the water tunnel 7 and the shield tunnel. After the reinforcement is completed, the shield tunnel can be penetrated under the water tunnel 7.

[0039] In the embodiment of the present application, the water-cement ratio of the cement slurry used for pouring is 1:1, so as to ensure good fluidity and thus form a uniform and dense reinforcement area.

[0040] Reference Figure 1 and Figure 3 , wherein the reinforcement equipment used in steps a and b includes a walking device 3, a reaming device 4 and a drilling device 5.

[0041] Reference Figure 1 and Figure 3The walking device 3 includes a mounting plate 31, a first cylinder 32, a walking support plate 33 and a second cylinder 34. There are multiple first cylinders 32 and walking support plates 33. In this embodiment, there are six first cylinders 32 and walking support plates 33. One walking support plate 33 and one first cylinder 32 are installed correspondingly. In other embodiments, the number of first cylinders 32 and walking support plates 33 can be freely selected, and their number does not serve as a limitation to this application.

[0042] Reference Figure 1 and Figure 3 The six first cylinders 32 are evenly distributed along the circumference of the mounting plate 31. The cylinder body of the first cylinder 32 and the side wall of the mounting plate 31 are fixedly connected with screws. The walking support plate 33 is an arc-shaped plate. The walking support plate 33 and the piston rod of the first cylinder 32 are welded. The telescopic axis of the first cylinder 32 is perpendicular to the axial direction of the mounting plate 31.

[0043] Reference Figure 1 and Figure 3 There are two second cylinders 34, which are distributed at intervals along the circumference of one side of the mounting plate 31. The telescopic axis of the second cylinder 34 is parallel to the axial direction of the mounting plate 31, and the cylinder body of the second cylinder 34 is fixedly connected to one side of the mounting plate 31 with screws.

[0044] Reference Figure 1 and Figure 3 The reaming device 4 includes a reaming disk 41, a third cylinder 42 and a reaming plate 43. The reaming disk 41 is fixedly connected to the piston rod of the second cylinder 34. The reaming disk 41 is coaxially arranged with the mounting disk 31. There are multiple third cylinders 42 and reaming plates 43. In this embodiment, there are six third cylinders 42 and reaming plates 43. One reaming plate 43 and one third cylinder 42 are installed correspondingly. In other embodiments, the number of third cylinders 42 and reaming plates 43 can be freely selected, and their number does not serve as a limitation to this application.

[0045] Reference Figure 1 and Figure 3 Six third cylinders 42 are evenly spaced along the circumference of the reaming disk 41. The cylinder bodies of the third cylinders 42 are fixedly connected to the sidewalls of the reaming disk 41 with screws. The reaming plate 43 is welded to the end of the piston rod of the third cylinder 42. The reaming plate 43 is an arc-shaped plate. A transition section 431 with a gradually decreasing diameter is provided on the end of the reaming plate 43 facing away from the traveling device 3. The provision of the transition section 431 facilitates the reaming device 4 to guide the drilling debris to the surrounding hole wall during the feeding process through the transition section 431, and then to perform the compaction operation through the reaming plate 43.

[0046] Reference Figure 1 and Figure 3The drilling device 5 includes a drill bit 51 and a driver 52. The drill bit 51 is a tapered drill bit 51 with a mounting rod 511 coaxially welded to one side of the drill bit 51. The drill bit 51 and the side of the reaming plate 41 facing away from the mounting plate 31 are coaxially connected for rotation via the mounting rod 511. A spiral feed blade 517 for digging soil is welded to the drill bit 51. The driver 52 includes a motor 521, a gear 522, and a gear ring 523. The housing of the motor 521 and the reaming plate 41 are fixedly connected by screws. The gear 522 is coaxially fixedly connected to the output shaft of the motor 521 by a key. The gear ring 523 is coaxially welded to the mounting rod 511 and meshes with the gear 522. A guide ring 512 is provided on the side of the drill bit 51 close to the reaming plate 41. The guide ring 512 is a conical ring. One end of the guide ring 512 is coaxially welded to the drill bit 51, and the diameter of the other end gradually increases and abuts against the transition section 431 of the reaming plate 43. The maximum diameter of the guide ring 512 is equal to the minimum diameter of the transition section 431.

[0047] Reference Figure 4 and Figure 5 The reinforcement equipment also includes a grouting hose 6. One end of the grouting hose 6 passes through the mounting plate 31 and the reaming plate 41 in sequence and is rotatably connected to the drill bit 51. A cavity 513 for grouting is provided in the connecting drill bit 51. The interior of the grouting hose 6 is connected to the cavity 513. A plurality of grouting holes 514 connected to the cavity 513 are provided on the drill bit 51. The grouting holes 514 are T-shaped holes. The drill bit 51 is provided with a sealing part at the grouting hole 514, which includes a sealing piece 515 and a torsion spring 516 tooth ring 523. The sealing piece 515 is buckled on the grouting hole 514, and the sealing piece 515 and the side wall of the grouting hole 514 are hinged with an axis. The torsion spring 516 tooth ring 523 is located at the hinge between the sealing piece 515 and the drill bit 51, and the torsion spring 516 tooth ring 523 is sleeved on the hinge shaft. The torsion spring 516 tooth ring 523 makes the sealing piece 515 tend to rotate toward the side close to the conveying drill bit 51.

[0048] The implementation principle of the stratum reinforcement method for a shield machine passing through an existing water conveyance tunnel in the embodiment of the present application is as follows: during the reinforcement construction, a conductive reinforcement hole 1 and a horizontal reinforcement hole 2 are first drilled around the water conveyance tunnel 7 using a drilling device 5. During the drilling process, the hole expansion device 4 expands and compacts the hole wall of the reinforcement hole. During the drilling process, the traveling device 3 drives the reinforcement equipment as a whole to feed forward. During the feeding process, the hole expansion plate 43 squeezes the soil generated by the drilling toward the hole wall. As the hole expansion device 4 feeds forward, the hole expansion plate 43 can compact the drilled hole wall into shape, thereby forming a hole wall chamber and a reinforced hole with a stable structure. After the reinforcement hole is drilled, cement slurry is poured into the channel through the grouting hose 6. While pouring the cement slurry, the traveling device 3 gradually drives the reinforcement equipment as a whole to move outside the channel. At the same time, when the drill bit 51 rotates, the cement slurry poured into the channel is stirred by the spiral feeding blade 517, so that the cement slurry is fully filled into the channel, which is conducive to forming a reinforced area with a stable structure.

[0049] During shield tunneling construction, the cement slurry columns in the shear force conduction reinforcement area 11 conduct the larger shear force to the outside of the ground through the cement slurry columns, thereby reducing the shear force generated by the soil or rock mass around the water diversion tunnel 7, thereby avoiding the water diversion tunnel 7 from cracking and settlement. By setting a flow-blocking and anti-disturbance reinforcement area 21 at the bottom of the water diversion tunnel 7, when the shield machine causes a large disturbance to the soil at the bottom of the water diversion tunnel 7, the cement slurry reinforcement plane formed by the flow-blocking and anti-disturbance reinforcement area 21 can prevent the disturbance from being transmitted in the direction of the conveying tunnel, thereby avoiding the water diversion tunnel 7 from cracking and settlement.

[0050] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A method for reinforcing the ground when a shield machine is used to penetrate an existing water conveyance tunnel, characterized in that: The following steps are involved: a. According to the design drawing, a plurality of conductive reinforcement holes (1) are vertically arranged at intervals on both sides of the water tunnel (7) to be penetrated by using reinforcement equipment, and cement slurry is poured into the conductive reinforcement holes (1) to form a shear force conductive reinforcement zone (11) between the water tunnel (7) and the shield tunnel; b. According to the design drawing, a plurality of horizontal reinforcement holes (2) are arranged at intervals at the bottom of the water tunnel (7) to be penetrated by using reinforcement equipment. The horizontal reinforcement holes (2) are connected to the conductive reinforcement holes (1) on both sides of the water tunnel (7). Cement slurry is poured into the horizontal reinforcement holes (2) to form a flow-blocking and anti-disturbance reinforcement zone (21) between the water tunnel (7) and the shield tunnel. After the reinforcement is completed, the shield tunnel can be penetrated below the water tunnel (7); The reinforcement device includes a walking device (3), a reaming device (4) and a drilling device (5), the walking device (3) includes a mounting plate (31), a first cylinder (32), a walking support plate (33) and a second cylinder (34), a plurality of the first cylinders (32) are provided, and the plurality of first cylinders (32) are evenly distributed along the circumference of the mounting plate (31), the cylinder body of the first cylinder (32) is fixedly connected to the mounting plate (31), a plurality of the walking support plates (33) are provided, and the walking support plates (33) and the first cylinder (32) are installed in a one-to-one correspondence, the walking support plates (33) are fixedly connected to the piston rod of the first cylinder (32), and the cylinder body of the second cylinder (34) is fixedly connected to the mounting plate (31); The reaming device (4) is connected to the piston rod of the second cylinder (34), and the reaming device (4) is used to expand and compact the hole wall of the reinforcement hole. The drilling device (5) is connected to the reaming device (4), and the drilling device (5) is used to drill holes. The reaming device (4) comprises a reaming disc (41), a third cylinder (42) and a reaming plate (43); the reaming disc (41) is connected to the second cylinder (34); a plurality of third cylinders (42) are provided, and the plurality of third cylinders (42) are evenly distributed along the circumference of the reaming disc (41); a cylinder body of the third cylinder (42) is fixedly connected to the reaming disc (41); and the reaming plate (43) is fixedly connected to a piston rod of the third cylinder (42); The drilling device (5) comprises a drill bit (51) and a driving member (52), wherein the drill bit (51) is rotatably connected to a side of a reaming disk (41) facing away from the walking device (3), the drill bit (51) and the reaming disk (41) are rotatably connected, and the driving member (52) is used to drive the drill bit (51) to rotate, and a spiral feed blade (517) is fixedly connected to the drill bit (51); The reinforcement device further comprises a grouting hose (6), one end of which passes through the mounting plate (31) and the reaming plate (41) in sequence and is connected to the drill bit (51), a cavity (513) for grouting is provided in the drill bit (51), one end of the grouting hose (6) is in communication with the cavity (513), and a plurality of grouting holes (514) in communication with the cavity (513) are provided on the drill bit (51); The drill bit (51) is provided with a blocking piece at the grouting hole (514), the blocking piece comprising a torsion spring (516) and a blocking piece (515); the grouting hole (514) is a T-shaped hole; the blocking piece (515) is buckled onto the grouting hole (514); the blocking piece (515) is hinged to the grouting hole (514); the torsion spring (516) is located at the hinge between the blocking piece (515) and the drill bit (51); the torsion spring (516) enables the blocking piece (515) to have a tendency to rotate toward a side close to the drill bit (51).

2. The method for reinforcing the ground when a shield machine passes through an existing water conveyance tunnel according to claim 1, characterized in that: The driving member (52) includes a motor (521), a gear (522) and a gear ring (523); the housing of the motor (521) is fixedly connected to the reaming disk (41); the gear (522) is fixedly connected to the output shaft of the motor (521); the gear ring (523) is fixedly connected to the drill bit (51); and the gear ring (523) is meshed with the gear (522).

3. The method for reinforcing the ground when a shield machine passes through an existing water diversion tunnel according to claim 2, characterized in that: The reaming device (4) further comprises a guide ring (512), one end of which is fixedly connected to the drill bit (51) and the other end of which is in contact with the reaming plate (43).

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