Shield tunnel segment back-wall synchronous grouting device

Abstract

The utility model provides a synchronous grouting device behind a shield tunnel segment wall. The synchronous grouting device comprises a shield tunneling machine, an elastic grouting pipe, a grouting outer pipe, a grouting inner pipe, a top inner pipe grouting opening, a communication grouting opening and a top outer pipe grouting opening. By arranging the inner and outer pipe structure, the shield tunneling machine can block the grouting opening before synchronous grouting and after grouting is completed, the problem that the grouting opening is blocked by soil in the extending process of the grouting pipe is solved, the probability that the grouting pipe is blocked is reduced, and then the long-term use stability of the grouting pipe is improved; a plurality of grouting openings are formed in the top and the two sides of the grouting pipe, so that grout can be evenly diffused to the top and the two sides of the grouting pipe, the probability that cavities are generated during grouting is reduced, the structure of the grouting pipe is simplified, the problem that the structure of the grouting pipe is complex and prone to damage is solved, the grouting quality is guaranteed, meanwhile, the grouting structure is simplified, and the grouting efficiency is improved. The stability of the device is improved, and the probability that operation of the internal structure of the storage tank is affected and the internal structure of the storage tank is damaged due to slurry recharging is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of shield tunnel construction, in particular to a synchronous grouting device behind the wall of a shield tunnel segment. Background Art

[0002] With the widespread application of shield tunnel construction in urban subways, it is increasingly important to reduce the impact of shield construction on tunnel superstructures. At present, the more common method is to inject slurry behind the shield body and the wall of the segment to fill the pores and block groundwater, so as to prevent surface subsidence caused by stratum loss and groundwater loss. In actual projects, grouting work is divided into synchronous grouting and secondary grouting. Synchronous grouting is a measure to fill the gap between the segment and the stratum with slurry in time when the segment is separated from the shield tail. Secondary grouting is to perform secondary grouting in places where synchronous grouting is insufficient through reserved grouting ports. Obviously, the quality of synchronous grouting plays a more important role in ensuring the quality and safety of the project and improving the efficiency of the project.

[0003] A Chinese patent with publication number CN114607398A discloses a shield tunnel segment wall back grouting construction method and device, including synchronous grouting and secondary grouting; the synchronous grouting device is composed of an elastic grouting pipe, an elbow grouting pipe and an arc-shaped push plate. During grouting, the grouting slurry is injected into the segment wall through the grouting elbow through the grouting pump. The downward impact force of the cement slurry and the self-weight of the elbow grouting pipe cause the arc-shaped push plate to first separate from the segment, and then approach and fit the segment, pushing the cement slurry evenly to both sides, reducing the probability of the cement slurry generating grouting cavities.

[0004] The shield tunnel segment wall back grouting device in the above patent has the following shortcomings: the grouting device is relatively complex, and damage to a part of the structure may affect the grouting effect; the shield tail receiving slot has a large opening, which easily causes slurry to flow back into the receiving slot; the elbow grouting pipe is not sealed, and it is easy to mix with slag before grouting. These factors may affect the grouting quality and efficiency. Utility Model Content

[0005] The utility model aims to provide a synchronous grouting device behind the wall of a shield tunnel segment. By setting an inner and outer pipe structure, the shield machine can seal the grouting port before and after the synchronous grouting is completed, which solves the problem of soil blocking the grouting port during the extension of the grouting pipe, reduces the probability of grouting pipe blockage, and thus improves the stability of the grouting pipe in long-term use; by arranging a plurality of grouting ports at the top and both sides of the grouting pipe, the slurry can be evenly diffused to the top and both sides of the grouting pipe, which not only reduces the probability of grouting to produce voids, but also simplifies the grouting pipe structure, solves the problem of complex and easy damage of the grouting pipe structure, ensures the grouting quality, simplifies the grouting structure, and improves the stability of the device; by simplifying the grouting pipe structure, the opening of the receiving slot is made smaller, which solves the problem of slurry back-injection into the receiving slot due to the large opening of the receiving slot, reduces the probability of slurry back-injection affecting the operation of the internal structure of the receiving slot, and reduces the probability of damage to the internal structure of the receiving slot.

[0006] In order to achieve the purpose of this utility model, the technical solution adopted is:

[0007] A synchronous grouting device behind the wall of a shield tunnel segment comprises a shield machine, an elastic grouting pipe, an outer grouting pipe, an inner grouting pipe, a top inner pipe grouting port, a connecting grouting port and a top outer pipe grouting port; a plurality of elastic grouting pipes are arranged on the outer ring of the shield machine, one end of the elastic grouting pipe is connected to a grouting pump of the shield machine, the other end of the elastic grouting pipe is connected to a grouting inner pipe, the outer wall of the grouting inner pipe is sleeved with a grouting outer pipe, the grouting outer pipe can be driven to rotate by a driven gear and a driving gear, the driving gear is driven to rotate by a driving motor to drive the driven gear to rotate, and the grouting outer pipe A connecting grouting port and a top outer tube grouting port are arranged between the grouting inner tube; a receiving groove is provided on the outer ring of the shield machine, and guide rails are provided at the left and right ends of the receiving groove, a driving slider is installed inside the guide rail at the right end, and the driving slider is hingedly connected to the grouting inner tube through a hinge joint, a hydraulic cylinder is arranged inside the receiving groove, and the hydraulic cylinder is fixedly connected to the driving slider, a driven slider is slidably installed inside the guide rail at the left end, and the driven slider is hingedly connected to the grouting inner tube through a hinge joint, and a grouting pipe inlet and outlet with a size equivalent to that of the grouting outer tube is provided on the receiving groove for the entry and exit of the grouting inner tube.

[0008] Preferably, the connecting grouting ports are distributed on the top and both sides of the grouting inner tube, including side outer tube grouting ports and side inner tube grouting ports. The side outer tube grouting ports are distributed on both horizontal sides of the grouting outer tube, and the side inner tube grouting ports are distributed on both horizontal sides of the grouting inner tube. An inner tube connecting protrusion is provided on the grouting inner tube, and a notch is provided at the lower part of the inner tube connecting protrusion. The grouting outer tube is tightly connected to the grouting inner tube through the raised connecting groove.

[0009] Preferably, a raised rotation limit protrusion is fixed in the connecting groove of the grouting outer tube, and the rotation limit protrusion can rotate in the notch of the inner tube connecting protrusion, and the rotation of the rotation limit protrusion is limited by the notch, so that the connecting grouting ports on the grouting outer tube and the grouting inner tube can be accurately aligned, and the connecting groove of the grouting outer tube is symmetrically arranged along the center on one side where the grouting outer tube extends out, and the driving limit protrusion drives the grouting outer tube to rotate through the driven gear.

[0010] Preferably, the driven gear is installed on one side of the inner side of the storage groove of the inlet and outlet of the grouting pipe, and three limiting grooves are symmetrically arranged on the driven gear. The limiting grooves correspond to the driving limiting protrusions and work together after being connected. The driven gear is meshed and driven by the driving gear installed on its side, and the driving gear is meshed and driven by the reversible driving motor, which is installed in the storage groove.

[0011] Preferably, at least three top inner tube grouting ports and top outer tube grouting ports are symmetrically arranged along the center, and at least ten side outer tube grouting ports and side inner tube grouting ports are symmetrically arranged along the center. After the grouting inner tube is rotated, the top inner tube grouting port is aligned with the top outer tube grouting port, the side outer tube grouting port and the side inner tube grouting port and then the grouting port works.

[0012] Preferably, an anti-blocking portion is provided on the grouting inner tube at the side of the connecting grouting port, the anti-blocking portion forms an angle of 60° with the side inner tube grouting port on the grouting inner tube, and the number of anti-blocking portions is the same as the number of the connecting grouting port, the side outer tube grouting port or the side inner tube grouting port, the anti-blocking portion includes a sealing column, one end of the sealing column is connected to a spring, an arc block is fixedly connected to the outer wall of the other side of the sealing column, an arc groove is provided on one side of the side outer tube grouting port of the grouting outer tube, the arc groove is used to guide the sealing column to move out of the side outer tube grouting port, and the arc block is snap-connected to the arc groove.

[0013] The utility model provides a synchronous grouting device behind the wall of a shield tunnel segment, which has the following advantages:

[0014] 1. In the utility model, by setting the inner and outer pipe structures, the shield machine can seal the grouting port before and after the synchronous grouting, which solves the problem of soil blocking the grouting port during the extension of the grouting pipe, reduces the probability of grouting pipe blockage, and thus improves the stability of the grouting pipe in long-term use.

[0015] 2. In the utility model, a plurality of grouting ports are arranged on the top and both sides of the grouting pipe, so that the slurry can be evenly diffused to the top and both sides of the grouting pipe, which not only reduces the probability of grouting producing voids, but also simplifies the structure of the grouting pipe, solves the problem that the grouting pipe structure is complex and easy to be damaged, and ensures the quality of grouting while simplifying the grouting structure and improving the stability of the device.

[0016] 3. In the utility model, by simplifying the grouting pipe structure, the opening of the receiving tank is made smaller, which solves the problem of slurry backflowing into the receiving tank due to the large opening of the receiving tank, reduces the probability of slurry backflow affecting the operation of the internal structure of the receiving tank, and reduces the probability of damage to the internal structure of the receiving tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 For the utility model Figure 1 A partial enlarged view of the middle part;

[0019] Figure 3 It is a top view of the structure of the utility model;

[0020] Figure 4 for Figure 2 Cross-section at the middle BB;

[0021] Figure 5 for Figure 2 Cross-section at CC;

[0022] Figure 6 for Figure 2 Cross-section at DD;

[0023] Figure 7 for Figure 2 Cross-section at EE.

[0024] In the figure: 1. Shield machine; 2. Elastic grouting pipe; 3. Grouting outer pipe; 4. Grouting inner pipe; 5. Grouting port of top inner pipe; 6. Connecting grouting port; 6-1. Grouting port of side outer pipe; 6-2. Grouting port of side inner pipe; 7. Driven gear; 8. Driving gear; 9. Hydraulic cylinder; 10. Articulated head; 11. Driving slider; 12. Driving motor; 13. Driven slider; 14. Guide rail; 15. Grouting port of top outer pipe; 16. Receiving groove; 100. Inner pipe connecting protrusion; 101. Outer pipe connecting protrusion; 102. Driving limit protrusion; 103. Limiting groove; 104. Rotation limit protrusion; 110. Sealing column; 111. Spring; 112. Arc groove; 113. Arc block. DETAILED DESCRIPTION

[0025] The utility model is further elaborated and illustrated below in conjunction with specific embodiments and the accompanying drawings of the specification.

[0026] In order to make the purpose, technical solution and advantages of the utility model more clear, the present invention is further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0027] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] See also Figure 1-2 In the embodiment of the utility model, a synchronous grouting device for the rear wall of a shield tunnel segment includes a shield machine 1, an elastic grouting pipe 2, a grouting outer pipe 3, a grouting inner pipe 4, a top inner pipe grouting port 5, a connecting grouting port 6 and a top outer pipe grouting port 15; a plurality of elastic grouting pipes 2 are arranged on the outer ring of the shield machine 1, one end of the elastic grouting pipe 2 is connected to the shield machine grouting pump, the other end of the elastic grouting pipe 2 is connected to the grouting inner pipe 4, the outer wall of the grouting inner pipe 4 is sleeved with the grouting outer pipe 3, the grouting outer pipe 3 can be driven to rotate by a driven gear 7 and a driving gear 8, the driving gear 8 is driven to rotate by a driving motor 12 to drive the driven gear 7 to rotate, and a connecting grouting port 6 is arranged between the grouting outer pipe 3 and the grouting inner pipe 4. And the top outer tube grouting port 15, the connecting grouting port 6 is distributed on the top and both sides of the grouting inner tube 4, including the side outer tube grouting port 6-1 and the side inner tube grouting port 6-2, the side outer tube grouting port 6-1 is distributed on both horizontal sides of the grouting outer tube 3, the side inner tube grouting port 6-2 is distributed on both horizontal sides of the grouting inner tube 4, the top inner tube grouting port 5 and the top outer tube grouting port 15 are symmetrically arranged with at least 3, the side outer tube grouting port 6-1 and the side inner tube grouting port 6-2 are symmetrically arranged with at least 10 along the center, after the grouting inner tube 4 is rotated, the top inner tube grouting port 5 is aligned with the top outer tube grouting port 15, the side outer tube grouting port 6-1 and the side inner tube grouting port 6-2, and then it works.

[0029] See also Figure 3A synchronous grouting device for the rear wall of a shield tunnel segment, a receiving groove 16 is provided on the outer ring of a shield machine 1, guide rails 14 are provided on the left and right ends of the receiving groove 16, a driving slider 11 is installed inside the guide rail 14 at the right end, the driving slider 11 is hingedly connected to a grouting inner tube 4 through a hinge head 10, a hydraulic cylinder 9 is provided inside the receiving groove 16, the hydraulic cylinder 9 is fixedly connected to the driving slider 11, a driven slider 13 is slidably installed inside the guide rail 14 at the left end, the driven slider 13 is hingedly connected to a grouting inner tube 4 through a hinge head 10, a grouting pipe inlet and outlet with a size equivalent to that of a grouting outer tube 3 is provided on the receiving groove 16 for the entry and exit of the grouting inner tube 4.

[0030] See also Figure 4-5 A synchronous grouting device for the rear wall of a shield tunnel segment, wherein an inner tube connecting protrusion 100 is arranged on the grouting inner tube 4, and a notch is opened at the lower part of the inner tube connecting protrusion 100, and the grouting outer tube 3 is tightly connected with the grouting inner tube 4 through a protruding connecting protrusion 101, and a protruding rotation limiting protrusion 104 is fixed in the connecting protrusion 101 of the grouting outer tube 3, and the rotation limiting protrusion 104 can rotate in the notch of the inner tube connecting protrusion (100), and the rotation limiting protrusion 104 is limited by the rotation of the notch, so that the connecting grouting ports 6 on the grouting outer tube 3 and the grouting inner tube 4 can be accurately aligned; the connecting protrusion 101 of the grouting outer tube 3 101 Three driving limit protrusions 102 are symmetrically arranged along the center on one side where the grouting outer tube 3 extends out, and the driving limit protrusion 102 drives the grouting outer tube 3 to rotate through the driven gear 7; the driven gear 7 is installed on one side inside the storage groove 16 of the grouting pipe inlet and outlet, and three limit grooves 103 are symmetrically arranged on the driven gear 7, and the limit grooves 103 correspond to the driving limit protrusions 102 and work together after being connected; the driven gear 7 is meshed and driven by the driving gear 8 installed on its side, and the driving gear 8 is meshed and driven by the reversible driving motor 12, and the driving motor 12 is installed in the receiving groove 16.

[0031] See also Figure 6-7 , a synchronous grouting device for the rear wall of a shield tunnel segment, a blocking portion is arranged on the grouting inner tube 4 at the side of the connecting grouting port 6, the blocking portion and the side inner tube grouting port 6-2 on the grouting inner tube 4 form an angle of 60°, and the number of blocking portions is the same as the number of the connecting grouting port 6, the side outer tube grouting port 6-1 or the side inner tube grouting port 6-2; the blocking portion includes a sealing column 110, one end of the sealing column 110 is connected to a spring 111, and an arc block 113 is fixedly connected to the outer wall of the other side of the sealing column 110, an arc groove 112 is arranged on one side of the side outer tube grouting port 6-1 of the grouting outer tube 3, the arc groove 112 is used to guide the sealing column 110 to move out of the side outer tube grouting port 6-1, and the arc block 113 is snap-connected with the arc groove 112.

[0032] During operation, after the tunnel segment is separated from the shield tail, the hydraulic cylinder 9 pushes the driving slide block 11 to move along the guide rail 14, and the top inner tube grouting port 5 is pushed out of the top outer tube grouting port 15, the side outer tube grouting port 6-1 and the side inner tube grouting port 6-2. The grouting inner tube 4 is pushed out of the shield machine storage slot 16 until the driving limit protrusion 102 on the side of the outer tube connecting groove 101 of the grouting outer tube 3 along the extension direction of the grouting inner tube 4 is connected with the limit groove 103 on the driven gear 7 installed at the grouting tube extension port inside the storage slot 16; before rotating the limit protrusion 14, the driving motor 12 drives the driving gear 8 to rotate, thereby driving the driven gear 7 to rotate, and at the driving limit Under the action of the engagement of the protrusion 102 and the limiting groove 103, the grouting outer tube 3 rotates, and the notch of the inner tube connection protrusion 100 at the connection between the grouting inner tube 4 and the grouting outer tube 3 restricts the rotation limiting protrusion 104 in the outer tube connection protrusion 101, so that the top inner tube grouting port 5 and the top outer tube grouting port 15, the side outer tube grouting port 6-1 and the side inner tube grouting port 6-2 can be accurately aligned, and the grouting pump spreads the slurry evenly around the grouting pipe through the top inner tube grouting port 5 of the grouting inner tube 4 and the grouting outer tube 3 and the top outer tube grouting port 15, the side outer tube grouting port 6-1 and the side inner tube grouting port 6-2, thereby reducing the probability of synchronous grouting generating cavities;

[0033] When the side outer tube grouting port 6-1 on the grouting inner tube 4 and the grouting outer tube 3 is blocked, stop grouting, start the drive motor 12 to rotate clockwise, the drive motor 12 drives the drive gear 8 to rotate, the drive gear 8 drives the driven gear 7, and then drives the grouting inner tube 4 to rotate clockwise. When it rotates 60°, the anti-blocking part on the grouting inner tube 4 is inserted into the side outer tube grouting port 6-1. The spring 111 of the anti-blocking part is compressed, and when the sealing column 110 is inserted into the side outer tube grouting port 6-1, the spring 111 stretches and expands. The sealing column 110 clears the side outer tube grouting port 6-1 to squeeze the blocked material out of the side outer tube grouting port 6-1. After clearing, the driving motor 12 rotates counterclockwise, and the driving motor 12 drives the driving gear 8 to rotate, and the driving gear 8 drives the driven gear 7, thereby driving the grouting inner tube 4 to rotate counterclockwise. When rotating 60°, the top inner tube grouting port 5 and the side inner tube grouting port 6-2 on the grouting inner tube 4 are aligned with the side outer tube grouting port 6-1 and the top outer tube grouting port 15 on the grouting outer tube 3, respectively, and the grouting work can be repeated.

[0034] In the utility model, by setting the inner and outer pipe structures, the utility model enables the shield machine to seal the grouting port before and after the synchronous grouting is completed, thereby solving the problem of soil blocking the grouting port during the extension of the grouting pipe, reducing the probability of grouting pipe blockage, and thus improving the stability of the grouting pipe in long-term use; by arranging multiple grouting ports at the top and both sides of the grouting pipe, the slurry can be evenly diffused to the top and both sides of the grouting pipe, which not only reduces the probability of grouting to produce voids, but also simplifies the grouting pipe structure, solves the problem of complex and easy damage of the grouting pipe structure, ensures the grouting quality, simplifies the grouting structure, and improves the stability of the device; by simplifying the grouting pipe structure, the opening of the receiving slot is made smaller, solving the problem of slurry backflowing into the receiving slot due to the large opening of the receiving slot, reducing the probability of slurry backflow affecting the operation of the internal structure of the receiving slot, and reducing the probability of damage to the internal structure of the receiving slot.

[0035] The technical solutions disclosed in the embodiments of the present invention are introduced in detail above. The principles and implementation methods of the embodiments of the present invention are explained in detail using specific embodiments. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A synchronous grouting device for the back wall of a shield tunnel segment, characterized in that: The invention comprises a shield machine (1), an elastic grouting pipe (2), an outer grouting pipe (3), an inner grouting pipe (4), a top inner pipe grouting port (5), a connecting grouting port (6) and a top outer pipe grouting port (15); the outer ring of the shield machine (1) is provided with a plurality of elastic grouting pipes (2); one end of the elastic grouting pipe (2) is connected to a grouting pump of the shield machine; the other end of the elastic grouting pipe (2) is connected to a grouting inner pipe (4); the outer wall of the grouting inner pipe (4) is sleeved with a grouting outer pipe (3); the grouting outer pipe (3) can be driven to rotate by a driven gear (7) and a driving gear (8); the driving gear (8) is driven to rotate by a driving motor (12) to drive the driven gear (7) to rotate; a connecting grouting port (6) and a top outer pipe grouting port (15) are provided between the grouting outer pipe (3) and the grouting inner pipe (4); The outer ring of the shield machine (1) is provided with a receiving groove (16), and guide rails (14) are provided at the left and right ends of the receiving groove (16). A driving slider (11) is installed inside the guide rail (14) at the right end, and the driving slider (11) is hingedly connected to the grouting inner tube (4) through a hinge head (10). A hydraulic cylinder (9) is provided inside the receiving groove (16), and the hydraulic cylinder (9) is fixedly connected to the driving slider (11). A driven slider (13) is slidably installed inside the guide rail (14) at the left end, and the driven slider (13) is hingedly connected to the grouting inner tube (4) through a hinge head (10). A grouting pipe inlet and outlet with a size equivalent to that of the grouting outer tube (3) is provided on the receiving groove (16) for the grouting inner tube (4) to enter and exit.

2. The synchronous grouting device for the back wall of a shield tunnel segment according to claim 1 is characterized in that: The communicating grouting ports (6) are distributed on the top and both sides of the grouting inner tube (4), and include side outer tube grouting ports (6-1) and side inner tube grouting ports (6-2). The side outer tube grouting ports (6-1) are distributed on both horizontal sides of the grouting outer tube (3), and the side inner tube grouting ports (6-2) are distributed on both horizontal sides of the grouting inner tube (4).

3. The synchronous grouting device for the back wall of a shield tunnel segment according to claim 2 is characterized in that: The grouting inner tube (4) is provided with an inner tube connection protrusion (100), the inner tube connection protrusion (100) is provided with a notch at the bottom, and the grouting outer tube (3) is tightly connected to the grouting inner tube (4) via a raised connection protrusion groove (101).

4. The synchronous grouting device for the back wall of a shield tunnel segment according to claim 3 is characterized in that: A protruding rotation limiting protrusion (104) is fixedly connected in the connection protrusion (101) of the grouting outer tube (3); the rotation limiting protrusion (104) can rotate in the notch of the inner tube connection protrusion (100), and the rotation of the rotation limiting protrusion (104) is limited by the notch, so that the connecting grouting ports (6) on the grouting outer tube (3) and the grouting inner tube (4) can be accurately aligned.

5. The synchronous grouting device for the back wall of a shield tunnel segment according to claim 4 is characterized in that: The connection convex groove (101) of the grouting outer tube (3) is provided with three driving limit convex blocks (102) symmetrically along the center on one side where the grouting outer tube (3) protrudes out, and the driving limit convex blocks (102) drive the grouting outer tube (3) to rotate via a driven gear (7).

6. The synchronous grouting device for the back wall of a shield tunnel segment according to claim 5 is characterized in that: The driven gear (7) is installed on one side of the inner side of the receiving groove (16) of the grouting pipe inlet and outlet. Three limiting grooves (103) are symmetrically arranged on the driven gear (7). The limiting grooves (103) correspond to the driving limiting protrusions (102) and work in coordination after being connected.

7. The synchronous grouting device for the back wall of a shield tunnel segment according to claim 6 is characterized in that: The driven gear (7) is meshed and drivenly connected with a driving gear (8) installed on its side, and the driving gear (8) is meshed and drivenly connected with a forward and reverse driving motor (12), and the driving motor (12) is installed in the storage groove (16).

8. The synchronous grouting device for the back wall of a shield tunnel segment according to claim 1, characterized in that: At least three top inner tube grouting ports (5) and top outer tube grouting ports (15) are symmetrically arranged along the center, and at least ten side outer tube grouting ports (6-1) and side inner tube grouting ports (6-2) are symmetrically arranged along the center. After the grouting inner tube (4) is rotated, the top inner tube grouting port (5) is aligned with the top outer tube grouting port (15), the side outer tube grouting port (6-1) and the side inner tube grouting port (6-2), and then the grouting inner tube (4) works.

9. The synchronous grouting device for the back wall of a shield tunnel segment according to claim 1, characterized in that: The grouting inner tube (4) is provided with an anti-blocking portion on the side of the connecting grouting port (6), the anti-blocking portion and the side inner tube grouting port (6-2) on the grouting inner tube (4) form an angle of 60°, and the number of the anti-blocking portions is the same as the number of the connecting grouting port (6), the side outer tube grouting port (6-1) or the side inner tube grouting port (6-2).

10. The synchronous grouting device for the back wall of a shield tunnel segment according to claim 9, characterized in that: The anti-blocking part comprises a sealing column (110), one end of which is connected to a spring (111), an arc block (113) is fixedly connected to the outer wall of the other side of the sealing column (110), and an arc groove (112) is provided on one side of the side outer tube grouting port (6-1) of the grouting outer tube (3), the arc groove (112) is used to guide the sealing column (110) to move out of the side outer tube grouting port (6-1), and the arc block (113) is snap-connected to the arc groove (112).

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