A reinforcement device and reinforcement method for damaged segments of shield tunnel

Abstract

The present invention discloses a reinforcement device for damaged segments of a shield tunnel, comprising six groups of segments laid in a 5+1 form, wherein two adjacent groups of segments are fixedly connected by a first bolt, wherein three groups of segments are internally provided with annular supports, wherein the annular supports are composed of eight groups of arc-shaped support units, and three groups of jacks are mounted on the inner wall of each of the annular supports, wherein the jacks apply a prestress of forty tons to the annular supports, and can provide sufficient annular supporting force to ensure the stability of other segments during the removal process of adjacent shield segments. The present invention facilitates the removal and replacement of damaged segments, and during the removal process of the segments, multiple measures are adopted to reinforce the segments to make them more stable and firm, and to prevent them from being damaged and displaced when replacing the segments, thereby reducing the risk of collapse of the shield tunnel and further reducing safety hazards.

Description

Technical Field

[0001] The invention relates to the technical field of shield tunnels, and in particular to a reinforcement device and a reinforcement method for damaged segments of a shield tunnel. Background Art

[0002] The shield method is a fully mechanized construction method in the dark excavation method. It pushes the shield machine into the ground, supports the surrounding rock with the shield shell and segments to prevent collapse into the tunnel, and excavates the soil in front of the excavation face with a cutting device, transports it out of the cave by the excavation machinery, presses it in the rear with jacks, and assembles prefabricated concrete segments to form a mechanized construction method for the tunnel structure. The shield tunnel construction method refers to the use of a shield machine to control the excavation face and the surrounding soil from collapse and instability, while tunneling and discharging slag, assembling segments in the machine to form a lining, and implementing wall grouting, so as to build a tunnel without disturbing the surrounding soil. The so-called "shield" of the shield machine refers to the cutterhead and pressure chamber that maintain the stability of the excavation face, and the shield steel shell that supports the surrounding soil. The so-called "structure" refers to the segments and wall grouting that constitute the tunnel lining.

[0003] In the prior art, the segments in the shield tunnel may be damaged. It is currently inconvenient to remove the damaged old segments and install new segments. That is, the reinforcement effect of the segments is not good during the removal of the segments. The segments may be damaged and displaced, and even cause the collapse of the shield tunnel, posing a great safety hazard. Therefore, we need to propose a reinforcement device and reinforcement method for damaged segments of shield tunnels. Summary of the invention

[0004] The purpose of the present invention is to provide a reinforcement device and a reinforcement method for damaged segments of a shield tunnel, which are convenient for removing and replacing damaged segments. During the segment removal process, a variety of measures are adopted to reinforce the segments to make them more stable and firm. When replacing the segments, they are less likely to be damaged and displaced, thereby reducing the risk of collapse of the shield tunnel and further reducing safety hazards, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a reinforcement device for damaged segments of a shield tunnel, comprising six groups of segments laid in a 5+1 form, wherein two adjacent groups of segments are fixedly connected by a first bolt, wherein three groups of segments are internally provided with annular supports, wherein the annular supports are composed of eight groups of arc-shaped support units, and three groups of jacks are mounted on the inner wall of each annular support, wherein the jacks apply a prestress of forty tons to the annular supports, and can provide sufficient annular support force to ensure the stability of other segments during the removal process of adjacent shield segments and prevent the collapse of the shield tunnel, and rubber pads are installed between the annular supports and the segments to ensure the annular support. The annular supports fit tightly with the segments and are evenly stressed. The three groups of annular supports are fixedly connected by eight groups of L-shaped longitudinal tie joints to form a complete force system to enhance stability. The segments can be removed only after the segment reinforcement is completed. An L-groove guide rail is fixedly installed on the segment by a second bolt. The L-groove guide rail can be used as a guide rail for a movable bracket and can also be used to pull the segment longitudinally to make the segment more evenly stressed, better avoid damage and displacement, and protect the integrity of the segment. Tie steel bars are fixedly installed on the segments of the three components by a third bolt to provide axial tie force for the shield segments and prevent axial displacement of the segments retained during the segment removal process.

[0006] Preferably, five groups of the segments are laid with flush seams, and another group of the segments are laid with staggered seams, to facilitate removal of the segments.

[0007] Preferably, the six groups of segments can be divided into three groups of standard blocks, two groups of adjacent blocks and one group of capping blocks, the two groups of adjacent blocks and one group of capping blocks are located at the upper ends of the three groups of standard blocks, and one group of capping blocks is located between the two groups of adjacent blocks.

[0008] Preferably, the annular support adopts a double-piece I-beam structure, and the thickness of the eight groups of support units is 540 mm, of which the radius of the support units of seven groups is 8370 mm, and the radius of the support units of the other group is 2790 mm.

[0009] Preferably, a first threaded blind hole is formed on the pipe segment, a first through hole is formed on the L-shaped groove guide rail, and one end of the second bolt passes through the first through hole and is threadedly installed in the first threaded blind hole.

[0010] Preferably, a second threaded blind hole is provided on the pipe segment, a second through hole is provided on the tensioning steel bar, and one end of the third bolt passes through the second through hole and is threadedly installed in the second threaded blind hole.

[0011] Preferably, the rubber pad is configured as an annular rubber pad, and the thickness of the rubber pad is configured to be 2 mm.

[0012] The present invention also provides a method for reinforcing a damaged segment of a shield tunnel, comprising the following steps:

[0013] S1. Communicate the requirements for laying shield segments in advance. When the shield construction jacking segments reach the station excavation section, the segments are laid in a 5+1 manner, that is, 5 segments are laid with the seams aligned and 1 segment is laid with the seams staggered, which is convenient for the removal of the shield segments.

[0014] S2. Lay the annular rubber pads and put them in according to the gap difference between the annular support and the pipe segment to ensure that the annular support and the pipe segment are in close contact and the force is evenly distributed;

[0015] S3, installing the support plates of the two support units at the bottom;

[0016] S4. Set up a movable installation frame platform and L-shaped groove guide rails to make the segments more evenly stressed, better avoid damage and displacement, and protect the integrity of the segments;

[0017] S5. A 50-ton jack is installed at the lower end of each side of the annular support, and the jack applies a 40-ton prestress to the annular support;

[0018] S6. Install three annular support units on both sides respectively;

[0019] S7. Install the last 50-ton jack to ensure the stability of other segments during the removal of adjacent shield segments and prevent the collapse of the shield tunnel;

[0020] S8. Connect the three installed annular supports with eight sets of L-shaped longitudinal tie joints to form a complete force-bearing system to enhance stability. The segments can be broken only after the segment reinforcement is completed;

[0021] S9. Install six sets of 13.5-meter-long tie bars to provide axial tie force for the shield segments to prevent axial displacement of the segments retained during segment removal.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] Through the design of annular support, jack, longitudinal tension joint, L-shaped groove guide rail and tension joint steel bar, the support plates of the two lowest support units are installed, a movable installation frame platform is set up, and an L-shaped groove guide rail is set up to make the pipe segment more evenly stressed, better avoid damage and displacement, and protect the integrity of the pipe segment. The jack applies 40 tons of prestress to the annular support. The three installed annular supports are connected with eight groups of L-shaped longitudinal tension joints to form a complete force system to enhance stability. The pipe segment can only be broken after the reinforcement is completed. Six groups of 13.5-meter-long tension joint steel bars are installed to provide axial tension joint force for the shield pipe segment to prevent axial displacement of the pipe segment retained during the removal of the pipe segment. The pipe segment can be broken after the reinforcement is completed. The present invention is convenient for removing and replacing damaged pipe segments, and in the process of removing the pipe segments, a variety of measures are adopted to reinforce the pipe segments to make them more stable and firm. When replacing the pipe segments, they are not easy to be damaged and displaced, which reduces the risk of collapse of the shield tunnel and thus reduces safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the pipe segment, the annular support and the tie-joint steel bar of the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of the pipe segment, the tie-joint steel bar and the third bolt of the present invention;

[0026] Figure 3 It is a structural schematic diagram of the support unit, the jack and the longitudinal pull joint of the present invention;

[0027] Figure 4 It is a schematic structural diagram of the L-shaped groove guide rail, the second bolt and the first threaded blind hole of the present invention;

[0028] Figure 5 For the present invention Figure 3 A large sample diagram of the midpoint A;

[0029] Figure 6 For the present invention Figure 3 A large sample diagram of the middle node B;

[0030] Figure 7 For the present invention Figure 3 A large sample diagram of the midpoint C;

[0031] Figure 8 It is a schematic structural diagram of the support unit of the present invention.

[0032] In the figure: 1. pipe segment; 2. annular support; 21. support unit; 3. jack; 4. rubber pad; 5. first bolt; 51. second bolt; 510. first threaded blind hole; 52. third bolt; 520. second threaded blind hole; 6. longitudinal tension joint; 7. L-shaped groove guide rail; 8. tension joint steel bar. DETAILED DESCRIPTION

[0033] 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.

[0034] The same or similar components are indicated by the same reference numerals in different drawings. In addition, please understand that terms such as "first", "second", "third", "upper", "lower", "front", "rear", "inner", "outer", "end", "portion", "segment", "width", "thickness", "region" and the like in the text are only for the convenience of readers to refer to the structures in the drawings and are only used to help describe the present invention, and are not limitations of the present invention.

[0035] See also Figure 1-8 The present invention provides a technical solution: a reinforcement device for damaged segments of a shield tunnel, comprising six groups of segments 1 laid in a 5+1 form, wherein two adjacent groups of segments 1 are fixedly connected by first bolts 5, wherein three groups of segments 1 are provided with annular supports 2 inside, the annular supports 2 are composed of eight groups of arc-shaped support units 21, and three groups of jacks 3 are mounted on the inner wall of each annular support 2, the jacks 3 apply 40 tons of prestress to the annular support 2, and can provide sufficient annular support force to ensure the stability of other segments in the process of removing adjacent shield segments, and prevent the collapse of the shield tunnel, and the annular support 2 A rubber pad 4 is installed between the annular support 2 and the segment 1 to ensure that the annular support 2 fits tightly with the segment 1 and is evenly stressed. The three groups of annular supports 2 are fixedly connected by eight groups of L-shaped longitudinal tie joints 6 to form a complete force system to enhance stability. The segment 1 can be removed only after reinforcement is completed. An L-shaped groove guide rail 7 is fixedly installed on the segment 1 by a second bolt 51. The L-shaped groove guide rail 7 can be used as a guide rail for a movable bracket and can longitudinally tie the segment 1 to make the segment 1 more evenly stressed, better avoid damage and displacement, and protect the integrity of the segment 1. A tie steel bar 8 is fixedly installed on the three-component segment 1 by a third bolt 52 to provide axial tie force for the shield segment to prevent axial displacement of the segment 1 retained during the removal of the segment 1.

[0036] Specifically, five groups of segments 1 are laid with flush joints, and another group of segments 1 is laid with staggered joints, so as to facilitate the removal of the segments 1.

[0037] Specifically, the six groups of segments 1 can be divided into three groups of standard blocks, two groups of adjacent blocks and one group of capping blocks, the two groups of adjacent blocks and one group of capping blocks are located at the upper ends of the three groups of standard blocks, and one group of capping blocks is located between the two groups of adjacent blocks.

[0038] Specifically, the annular support 2 adopts a double-jointed I-beam structure, and the thickness of the eight groups of support units 21 is 540 mm, of which the radius of seven groups of support units 21 is 8370 mm, and the radius of the other group of support units 21 is 2790 mm.

[0039] Specifically, a first threaded blind hole 510 is formed on the pipe segment 1 , a first through hole is formed on the L-shaped groove guide rail 7 , and one end of the second bolt 51 passes through the first through hole and is threadedly installed in the first threaded blind hole 510 .

[0040] Specifically, a second threaded blind hole 520 is formed on the pipe segment 1 , a second through hole is formed on the tie-joint steel bar 8 , and one end of the third bolt 52 passes through the second through hole and is threadedly installed in the second threaded blind hole 520 .

[0041] Specifically, the rubber pad 4 is set to be an annular rubber pad, and the thickness of the rubber pad 4 is set to 2 mm.

[0042] The present invention also provides a method for reinforcing a damaged segment of a shield tunnel, comprising the following steps:

[0043] S1. Communicate the requirements for laying shield segments in advance. When the shield construction jacking segments reach the station excavation section, the segments are laid in a 5+1 manner, that is, 5 segments are laid with the seams aligned and 1 segment is laid with the seams staggered, which is convenient for the removal of the shield segments.

[0044] S2. Lay the annular rubber pads and put them in according to the gap difference between the annular support and the pipe segment to ensure that the annular support and the pipe segment are in close contact and the force is evenly distributed;

[0045] S3, installing the support plates of the two support units at the bottom;

[0046] S4. Set up a movable installation frame platform and L-shaped groove guide rails to make the segments more evenly stressed, better avoid damage and displacement, and protect the integrity of the segments;

[0047] S5. A 50-ton jack is installed at the lower end of each side of the annular support, and the jack applies a 40-ton prestress to the annular support;

[0048] S6. Install three annular support units on both sides respectively;

[0049] S7. Install the last 50-ton jack to ensure the stability of other segments during the removal of adjacent shield segments and prevent the collapse of the shield tunnel;

[0050] S8. Connect the three installed annular supports with eight sets of L-shaped longitudinal tie joints to form a complete force-bearing system to enhance stability. The segments can be broken only after the segment reinforcement is completed;

[0051] S9. Install six sets of 13.5-meter-long tie bars to provide axial tie force for the shield segments to prevent axial displacement of the segments retained during segment removal.

[0052] During use, the requirements for laying the shield segments are communicated in advance. When the shield construction jacking segments reach the station excavation section, the segments are laid in a 5+1 manner, that is, 5 segments are laid with equal seams, and 1 segment is laid with staggered seams, so as to facilitate the removal of the shield segments. Then, annular rubber pads are laid, and rubber pads are placed according to the difference in gap between the annular support and the segments to ensure that the annular support is in close contact with the segments so that the force is evenly distributed. Then, the support plates of the two lowest support units are installed, a movable mounting frame platform is set up, and an L-shaped groove guide rail is set up to make the force on the segments more even, better avoid damage and displacement, and protect the integrity of the segments. Then, a 50-ton grommet is installed at the lower end of each side of the annular support. The jack applies 40 tons of prestress to the annular support and installs three annular support units on both sides respectively; then the last 50-ton jack is installed to ensure the stability of other segments during the removal of the adjacent shield segments and prevent the collapse of the shield tunnel. The three installed annular supports are connected with eight groups of L-shaped longitudinal tension joints to form a complete force system to enhance stability. The segments can only be removed after the reinforcement is completed. Finally, six groups of 13.5-meter-long tension steel bars are installed to provide axial tension force for the shield segments to prevent axial displacement of the segments retained during the removal of the segments. The segments can only be removed after the reinforcement is completed.

[0053] 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 reinforcement device for damaged segments of a shield tunnel, comprising six groups of segments (1) laid in a 5+1 form, characterized in that: Two adjacent groups of segments (1) are fixedly connected by first bolts (5), wherein the inside of the three groups of segments (1) is provided with an annular support (2), the annular support (2) is composed of eight groups of arc-shaped support units (21), and three groups of jacks (3) are mounted on the inner wall of each annular support (2), and the jacks (3) apply a prestress of 40 tons to the annular support (2), providing sufficient annular support force, ensuring the stability of other segments during the removal process of adjacent shield segments, and preventing the collapse of the shield tunnel; A rubber pad (4) is installed between the annular support (2) and the pipe segment (1) to ensure that the annular support (2) and the pipe segment (1) are tightly fitted and evenly stressed. The three groups of annular supports (2) are fixedly connected by eight groups of L-shaped longitudinal tie joints (6) to form a complete stress-bearing system, thereby enhancing stability. An L-shaped groove guide rail (7) is fixedly mounted on the pipe segment (1) by a second bolt (51); the L-shaped groove guide rail (7) can be used as a guide rail of a movable bracket and can also longitudinally pull the pipe segment (1) so that the force on the pipe segment (1) is more uniform, so as to better avoid damage and displacement and protect the integrity of the pipe segment (1); The three groups of segments (1) are fixedly mounted with tie bars (8) by third bolts (52) to provide axial tie forces for the shield segments, thereby preventing the segments (1) that remain during the removal of the segments (1) from axial displacement; Five groups of the pipe segments (1) are laid with even seams, and another group of the pipe segments (1) are laid with staggered seams, so that the removal of the pipe segments (1) is convenient.

2. The reinforcement device for damaged segments of shield tunnels according to claim 1 is characterized in that: The six groups of segments (1) are divided into three groups of standard blocks, two groups of adjacent blocks and one group of capping blocks. The two groups of adjacent blocks and one group of capping blocks are located at the upper ends of the three groups of standard blocks, and one group of capping blocks is located between the two groups of adjacent blocks.

3. The reinforcement device for damaged segments of shield tunnels according to claim 1 is characterized in that: The annular support (2) adopts a double-jointed I-beam structure, and the thickness of the eight groups of support units (21) is 540 mm, of which the radius of seven groups of support units (21) is 8370 mm, and the radius of the other group of support units (21) is 2790 mm.

4. The reinforcement device for damaged segments of shield tunnels according to claim 1 is characterized in that: The pipe segment (1) is provided with a first threaded blind hole (510), the L-shaped groove guide rail (7) is provided with a first through hole, and one end of the second bolt (51) passes through the first through hole and is threadedly installed in the first threaded blind hole (510).

5. The reinforcement device for damaged segments of shield tunnels according to claim 1 is characterized in that: The pipe segment (1) is provided with a second threaded blind hole (520), the tie-joint steel bar (8) is provided with a second through hole, and one end of the third bolt (52) passes through the second through hole and is threadedly installed in the second threaded blind hole (520).

6. The reinforcement device for damaged segments of shield tunnels according to claim 1, characterized in that: The rubber pad (4) is configured as an annular rubber pad, and the thickness of the rubber pad (4) is configured to be 2 mm.

7. A method for reinforcing a damaged segment of a shield tunnel, comprising the following steps: S1. When the shield construction jacking segment reaches the station excavation section, the segments are laid in a 5+1 manner, that is, 5 segments are laid with the seams aligned and 1 segment is laid with the seams staggered, which is convenient for the removal of the shield segments; S2. Lay the annular rubber pads and put them in according to the gap difference between the annular support and the pipe segment to ensure that the annular support and the pipe segment are in close contact and the force is evenly distributed; S3, installing the support plates of the two support units at the bottom; S4. Set up a movable installation frame platform and L-shaped groove guide rails to make the segments more evenly stressed, better avoid damage and displacement, and protect the integrity of the segments; S5. A 50-ton jack is installed at the lower end of each side of the annular support, and the jack applies a 40-ton prestress to the annular support; S6. Install three annular support units on both sides respectively; S7. Install the last 50-ton jack to ensure the stability of other segments during the removal of adjacent shield segments and prevent the collapse of the shield tunnel; S8. Connect the three installed annular supports with eight sets of L-shaped longitudinal tie joints to form a complete force-bearing system to enhance stability. The segments can be broken only after the segment reinforcement is completed; S9. Install six sets of 13.5-meter-long tie bars to provide axial tie force for the shield segments to prevent axial displacement of the segments retained during segment removal.

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