A shield tunnel segment crack plugging device and construction method

Abstract

The present invention discloses a shield tunnel segment crack plugging device, comprising: a metal box, which includes a top plate, a pair of first side plates, a pair of second side plates and a bottom plate, the pair of first side plates are relatively fixed to the two sides of the top plate respectively, the pair of second side plates are V-shaped and relatively fixed to the other two sides of the top plate respectively, the bottom plate is in an inverted V-shape and fixed to the bottom edge of the pair of first side plates, a pair of first side plates are symmetrically provided with a plurality of reserved grouting holes, the top plate is provided with grouting holes, the metal box is made of a flexible steel sheet; a reserved grouting pipe is vertically sealed and connected to the grouting hole; a plurality of rubber sleeves are respectively sleeved on the outer periphery of the metal box to seal and cover the plurality of reserved grouting holes. The present invention also discloses a shield tunnel segment crack plugging construction method. The present invention can not only meet the purpose of segment crack plugging, but also form a wedge-shaped body in the segment crack, thereby effectively reducing the risk of plugging material falling off.

Description

Technical Field

[0001] The present invention relates to the technical field of subway tunnel construction quality equipment, and more specifically, to a shield tunnel segment crack plugging device and construction method, which is suitable for plugging and repairing penetrating and non-penetrating cracks in shield tunnel segments. Background Art

[0002] With the rapid development of my country's economy and technology, subway tunnel projects have been widely launched in major cities across the country. Although my country's subway tunnel construction technology has made great progress and development, there is still no effective and unified treatment method for blocking the cracks in the shield tunnel segments due to the irregularity of the cracks. As the permanent support structure of the shield tunnel, once the segments are damaged or cracked, they will pose a huge threat to the safety of the shield tunnel and the later operation of the subway.

[0003] Conventional techniques such as in-tunnel grouting or applying plugging materials can achieve the purpose of sealing the cracks in the pipe segments in a short period of time, but with the passage of time and the influence of groundwater corrosion, the plugging materials are prone to aging. Under the vibration of the train, the plugging materials are also prone to falling off. Summary of the invention

[0004] One object of the present invention is to provide a shield tunnel segment crack sealing device and construction method, which can not only meet the purpose of segment crack sealing, but also form a wedge in the segment crack, thereby effectively reducing the risk of plugging materials falling off, and solving the problem of shield tunnel segment through and non-through crack sealing and repair.

[0005] In order to achieve these purposes and other advantages according to the present invention, a shield tunnel segment crack plugging device is provided, comprising:

[0006] A metal box, comprising a top plate, a pair of first side plates, a pair of second side plates and a bottom plate, wherein the top plate and the pair of first side plates are both square and the pair of first side plates are respectively fixed relatively to two sides of the top plate, the pair of second side plates are V-shaped and are respectively fixed relatively to the other two sides of the top plate, the bottom plate is welded by two square plates in an inverted V shape and is fixed to the bottom edges of the pair of first side plates, the pair of first side plates are both in a matrix and symmetrically provided with a plurality of reserved grouting holes, the top plate is provided with grouting holes, and the metal box is made of a flexible steel sheet;

[0007] A grouting pipe is reserved, which is vertically sealed and connected to the grouting hole;

[0008] The rubber sleeves are in plurality and are respectively sleeved on the outer circumference of the metal box to seal and cover the plurality of reserved grouting holes.

[0009] Preferably, the metal box is welded into one piece through a top plate, a side plate and a bottom plate, and the reserved grouting pipe is also welded to the metal box.

[0010] Preferably, the second side plate is formed by welding two right-angled triangular plates.

[0011] Preferably, the grouting hole is located at the center of the top plate.

[0012] Preferably, the height of the first side panel is equal to the length of the hypotenuse of the second side panel.

[0013] Preferably, the second side plate and the bottom plate are both symmetrical V-shaped structures.

[0014] Preferably, the reserved grouting pipe is vertically inserted into the grouting hole and close to the inner wall of the grouting hole, a plurality of through holes are evenly spaced along the circumference of the upper portion of the reserved grouting pipe, a part of the reserved grouting pipe close to the through hole is made of elastic material, a plurality of channels are evenly spaced along the circumference of the lower portion of the reserved grouting pipe, a horizontal elastic member is arranged therein, and the length of the elastic member in a free state is greater than the length of the channel, and further comprises:

[0015] A fixed pipe, the inner diameter of which is the same as the diameter of the grouting hole and the axis of which coincides with the axis of the grouting hole, the upper end of which is fixed to the lower surface of the top plate of the metal box;

[0016] A fixing seat, which is a circular convex structure with a hollow interior, is just sleeved on the outside of the reserved grouting pipe and is located on the upper surface of the metal box top plate, a plurality of elastic blocks are fixed on the boss of the fixing seat, a plurality of mounting seats are fixed on the upper surface of the fixing seat, and a shaft rod is mounted thereon, and a plurality of inwardly concave grooves are arranged on the inner wall of the fixing seat facing the reserved grouting pipe, which respectively correspond to a plurality of elastic members;

[0017] There are multiple support rods, which are rotatably sleeved on the shaft rod respectively, one end of the support rod is slidably hinged to the upper end of the limit rod, the lower end of the limit rod is fixedly connected to the elastic block, and the other ends of the multiple support rods pass through multiple through holes respectively and are located inside the reserved grouting pipe;

[0018] A grouting plate, which is slidably arranged close to the inner wall of the fixed pipe, and the grouting plate is arranged close to the lower end of the reserved grouting pipe;

[0019] A plurality of pull ropes are provided, one end of each of the pull ropes is respectively fixed to the other end of each of the plurality of support rods, and the other ends of each of the pull ropes are respectively tightened and fixed on the grouting plate vertically downward.

[0020] Preferably, the elastic member includes a limit column, a spring and a limit plate which are arranged in sequence from the outer wall to the inner wall of the reserved grouting pipe, and the two ends of the spring are respectively connected to the limit column and the limit plate, the limit column is exactly matched with the groove, the upper surface of the limit plate has a downwardly recessed annular groove, and also includes a retaining ring, which is formed by the upper edge of the sleeve extending horizontally outward and then bending downward. When the limit column is completely located in the reserved grouting pipe and the limit plate compresses the spring, the retaining ring is vertically close to the limit plate and the downwardly bent part is exactly located in the annular groove.

[0021] The present invention also provides a shield tunnel segment crack plugging construction method, comprising the following steps:

[0022] S1: Determine the location of the cracks in the pipe segment and clean them up;

[0023] S2: tilting a pair of first side plates toward a pair of second side plates so that the side surface of the metal box is tapered and the bottom plate is merged in a V shape, and at the same time, a rubber sleeve is used to cover and enclose the reserved grouting holes on the metal box;

[0024] S3: Insert the metal box into the crack of the pipe segment in a cone shape to the bottom of the crack;

[0025] S4: Connect the grouting nozzle of the pinhole grouting pump to the reserved grouting pipe, and inject the plugging slurry into the plugging device through the reserved grouting pipe until the rubber sleeve is expanded and the cracks in the pipe segment are filled with the plugging slurry;

[0026] S5: After the plugging slurry solidifies and meets the maintenance period, remove the reserved grouting pipe and smooth the surface of the pipe segment.

[0027] Preferably, before step S3, the method also includes fixing the fixed pipe in the metal box, and connecting the fixed seat, the support rod, the grouting plate, the pull rope and the reserved grouting pipe related parts; after step S4, the method also includes stopping the grouting and sealing the reserved grouting pipe when the slurry pushes the grouting plate to move up to the top plate of the metal box and the limit column is engaged into the groove; step S5 includes cutting off the pull rope and taking away the reserved grouting pipe and the fixed seat related parts after the plugging slurry solidifies and meets the maintenance period.

[0028] The present invention has at least the following beneficial effects:

[0029] 1. The plugging device and method of the present invention can not only achieve the purpose of repairing cracks in pipe segments and plugging leaks, but also effectively prevent the risk of crack plugging bodies falling off during subway operation.

[0030] 2. The plugging device and material of the present invention can form a wedge in the cracks of the pipe segment, thereby effectively reducing the risk of plugging materials falling off, and solving the problem of plugging and repairing penetrating and non-penetrating cracks in the shield tunnel segment.

[0031] 3. The reserved grouting pipe of the present invention can be easily removed through reasonable arrangement without the need for additional tools.

[0032] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a front structural schematic diagram of the blocking device of the present invention;

[0034] Figure 2 It is a schematic diagram of the side structure of the blocking device of the present invention when it is not expanded;

[0035] Figure 3 It is a schematic diagram of the side structure of the plugging device of the present invention after expansion;

[0036] Figure 4 This is a schematic diagram of the working principle of the blocking device of the present invention;

[0037] Figure 5 This is a schematic diagram of the application effect of the plugging device of the present invention;

[0038] Figure 6 This is a schematic diagram of the structure of the grouting pipe reserved before grouting in the present invention;

[0039] Figure 7 This is a schematic diagram of the structure of the grouting pipe reserved after grouting is completed in the present invention;

[0040] Figure 8 It is a schematic diagram of the positional relationship between the elastic member and the retaining ring of the present invention.

[0041] Description of reference numerals:

[0042] 1. Reserved grouting pipe, 2. Metal box, 3. First side plate, 4. Second side plate, 5. Bottom plate, 6. Rubber sleeve, 7. Reserved grouting hole, 8. Pipe segment, 9. Pipe segment crack, 10. Fixed pipe, 11. Grouting plate, 12. Fixed seat, 13. Elastic block, 14. Support rod, 15. Shaft rod, 16. Limit rod, 17. Groove, 18. Pull rope, 19. Elastic material, 20. Limit column, 21. Spring, 22. Limit plate, 23. Retaining ring. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0044] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships 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, and do not indicate or imply 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.

[0045] Example 1

[0046] like Figures 1 to 5 As shown, the present invention provides a shield tunnel segment crack plugging device, comprising: a metal box 2, which includes a top plate, a pair of first side plates 3, a pair of second side plates 4 and a bottom plate 5, the top plate and the pair of first side plates 3 are both square and the pair of first side plates 3 are respectively fixed to the two sides of the top plate, the pair of second side plates 4 are V-shaped and are respectively fixed to the other two sides of the top plate, the bottom plate 5 is welded by two square plates in an inverted V shape and fixed to the bottom edge of the pair of first side plates 3, the pair of first side plates 3 are both in a matrix and symmetrically provided with a plurality of reserved grouting holes 7, the center of the top plate is provided with a grouting hole, the metal box 2 is made of a flexible steel sheet; a reserved grouting pipe 1, which is vertically sealed and connected to the grouting hole; a plurality of rubber sleeves 6, which are respectively sleeved on the outer periphery of the metal box 2 to seal and cover the plurality of reserved grouting holes 7. The metal box 2 is welded into one by the top plate, the side plate and the bottom plate 5, and the reserved grouting pipe 1 is also welded to the metal box 2. The second side plate 4 is formed by welding two right-angled triangular plates. The height of the first side plate 3 is equal to the length of the hypotenuse of the second side plate 4, and the second side plate 4 and the bottom plate 5 are both symmetrical V-shaped structures.

[0047] The present invention also provides a shield tunnel segment crack plugging construction method, comprising the following steps:

[0048] S1: Determine the location of the crack 9 in the pipe segment and clean it up;

[0049] S2: tilt the pair of first side plates 3 toward the pair of second side plates 4 so that the side surface of the metal box 2 is tapered and the bottom plate 5 is merged in a V shape, and at the same time, the reserved grouting holes 7 on the metal box 2 are covered by the rubber sleeve 6;

[0050] S3: insert the metal box 2 into the crack 9 of the pipe segment in a conical shape to the bottom of the crack;

[0051] S4: Connect the grouting nozzle of the pinhole grouting pump to the reserved grouting pipe 1, and inject the plugging slurry into the plugging device through the reserved grouting pipe 1 until the rubber sleeve 6 is expanded and the cracks in the pipe segment are filled with the plugging slurry;

[0052] S5: After the plugging slurry solidifies and meets the curing period, the reserved grouting pipe 1 is removed and the surface of the pipe segment 8 is smoothed.

[0053] In the above technical scheme, the reserved grouting pipe 1 is processed from steel sheets, with a cylindrical structure and a size matching the grouting nozzle of the pinhole grouting pump, and the lower part is welded and connected with the metal box 2. The metal box 2 is composed of 6 iron sheets, the upper, front and rear parts are composed of flat iron plates, and the two sides and the lower part are processed from "V"-shaped iron sheets. The 6 iron sheets are welded and connected. Before the metal box 2 is inserted into the crack of the pipe segment, the lower "V"-shaped iron sheet is merged so that the metal box 2 is inserted into the crack in a conical shape. Circular grouting holes are opened on the upper part of the front and rear iron sheets. Before the metal box 2 is inserted into the crack of the pipe segment, the rubber sleeve 6 is wrapped around the opening area of ​​the metal box 2, and the reserved grouting holes 7 are covered tightly. The rubber sleeve 6 is a rubber water stop, which is wrapped around the opening area of ​​the metal box 2 to seal the reserved grouting holes 7. The reserved grouting holes 7 are arranged in a linear array on the front and rear sides of the metal box 2.

[0054] The specific construction method is as follows: after determining the position of the crack 9 of the pipe segment and cleaning it, the lower part of the plugging device is inserted into the crack of the pipe segment. After reaching the bottom of the crack, the grouting nozzle of the pinhole grouting pump is connected to the reserved grouting pipe 1, and the plugging slurry is injected into the plugging device through the reserved grouting pipe 1. As the grouting pressure and grouting amount gradually increase, the internal volume of the metal box 2 gradually increases. When the grouting pressure increases to a certain value, the rubber sleeve 6 is expanded, and the slurry penetrates into the gap between the metal box 2 and the crack until the crack is filled with the plugging slurry. Since the metal box 2 is a steel sheet and a flexible material, the crack can be filled according to the size and shape of the crack. After the above-mentioned plugging slurry solidifies, the plugging material, the metal box 2, and the pipe segment 8 are bonded together and present an inverted cone shape, which can effectively prevent the risk of the plugging plug falling off under the vibration of the later subway operation. After the above-mentioned plugging slurry solidifies and meets the maintenance period, the reserved grouting pipe 1 is removed and the surface of the pipe segment 8 is smoothed, and the purpose of repairing the cracks and plugging the leaks of the pipe segment is finally achieved.

[0055] Example 2

[0056] like Figures 6 to 8As shown, on the basis of Example 1, in order to better achieve grouting plugging, and after the construction is completed, the reserved grouting pipe 1 can be easily removed without the need to use additional tools for cutting, the present invention also provides a structure of a reserved grouting pipe 1, which is not welded and fixed to the metal box 2, but is vertically inserted into the grouting hole and close to the inner wall of the grouting hole, and the upper part of the reserved grouting pipe 1 is evenly spaced along its circumference. A portion of the material of the reserved grouting pipe 1 near the through hole is set to an elastic material 19, and the lower part of the reserved grouting pipe 1 is also evenly spaced along its circumference. A plurality of channels are arranged in a horizontal elastic member, and the length of the elastic member in the free state is greater than the length of the channel, and also includes:

[0057] A fixed pipe 10, whose inner diameter is the same as the diameter of the grouting hole and whose axis coincides with the axis of the grouting hole, and whose upper end is fixed to the lower surface of the top plate of the metal box 2;

[0058] The fixing seat 12 is a circular convex structure with a hollow interior. The fixing seat 12 is just sleeved on the outside of the reserved grouting pipe 1 and is located on the upper surface of the top plate of the metal box 2. A plurality of elastic blocks 13 are fixed on the boss of the fixing seat 12. A plurality of mounting seats are fixed on the upper surface of the fixing seat 12, and a shaft 15 is mounted thereon. The fixing seat 12 is provided with a plurality of inwardly concave grooves 17 on the inner wall facing the reserved grouting pipe 1, which respectively correspond to a plurality of elastic members.

[0059] The support rods 14 are multiple and are rotatably sleeved on the shaft rod 15, one end of the support rod 14 is slidably hinged to the upper end of the limit rod 16, the lower end of the limit rod 16 is fixedly connected to the elastic block 13, and the other ends of the multiple support rods 14 pass through multiple through holes and are located inside the reserved grouting pipe 1;

[0060] A grouting plate 11, which is slidably arranged close to the inner wall of the fixed pipe 10, and the grouting plate 11 is arranged close to the lower end of the reserved grouting pipe 1;

[0061] A plurality of pull ropes 18 are provided, one end of each of the pull ropes 18 is fixed to the other end of each of the support rods 14 , and the other ends of each of the pull ropes 18 are vertically tightened downward and fixed to the grouting plate 11 .

[0062] The elastic member includes a limit column 20, a spring 21 and a limit plate 22 which are arranged in sequence from the outer wall to the inner wall of the reserved grouting pipe 1. The two ends of the spring 21 are respectively connected to the limit column 20 and the limit plate 22. The limit column 20 is exactly matched with the groove 17. The upper surface of the limit plate 22 has a downwardly concave annular groove, and also includes a retaining ring 23, which is formed by the upper edge of the sleeve extending horizontally outward and then bending downward. When the limit column 20 is completely located in the reserved grouting pipe 1 and the limit plate 22 compresses the spring 21, the retaining ring 23 is vertically close to the limit plate 22 and the downwardly bent part is exactly located in the annular groove.

[0063] Based on the construction method of Example 1, before step S3, it also includes fixing the fixed pipe 10 in the metal box 2, and connecting the fixed seat 12, the support rod 14, the grouting plate 11, the pull rope 18 and the reserved grouting pipe 1 related parts; after step S4, it also includes stopping the grouting and blocking the reserved grouting pipe 1 when the slurry pushes the grouting plate 11 to move up to the top plate of the metal box 2 and the limit column 20 is engaged into the groove 17; step S5 includes cutting off the pull rope 18 and taking away the reserved grouting pipe 1 and the fixed seat 12 related parts after the plugging slurry solidifies and meets the maintenance period.

[0064] In the above technical scheme, the reserved grouting pipe 1 part above and below the through hole is set to an elastic material 19, so that the support rod 14 does not affect the structure of the reserved grouting pipe 1 when rotating. The height of the natural through hole is also greater than the height of the support rod 14 to ensure that the through hole does not affect the smooth rotation of the support rod 14. The elastic member in the channel is compressed in the channel in the initial state and a blocking plate is set through the outer side of the channel, that is, the inner wall of the reserved grouting pipe 1 so that the elastic member does not extend from the outer side of the channel. The elastic block 13 is set to be able to only stretch up and down, and the mounting seat is used to install the shaft rod 15. The support rod 14 has a round through hole and is just sleeved on the shaft rod 15 and rotates along the shaft rod 15. The direction of rotation is up and down along the radial direction of the reserved grouting pipe 1. The limit rod 16 is connected to the hinge, and the hinge is set to be able to slide along the length direction of the support rod 14, so that the limit rod 16 is slidably hinged on the support rod 14.

[0065] In the initial state, if Figure 6As shown, the reserved grouting pipe 1 is located in the fixed pipe 10 and the spring 21 is compressed by the limit plate 22. The retaining ring 23 vertically presses the multiple limit plates 22 downward, and the bent part of the retaining ring 23 is stuck in the annular groove to achieve positioning. The pull rope 18 tightens the grouting plate 11 and the support rod 14. At this time, the support rod 14 is in a horizontal state and the elastic block 13 is in a natural state; during grouting, grouting is performed through the reserved grouting pipe 1 to expand the rubber sleeve 6 until the sealing slurry fills the crack 9 of the pipe segment. At this time, grouting is still in progress. Under the strong pressure of grouting, the grouting plate 11 is pushed upward, and the reserved grouting pipe 1 is also moved upward. During the movement of the reserved grouting pipe 1, the multiple support rods 14 are driven to rotate around the shaft rod 15. The support rod 14 compresses the elastic block 13 through the limit rod 16. The pressure of multiple elastic blocks 13 The downward thrust given to the fixing seat 12 by the contraction ensures the stability of the fixing seat 12, and also ensures the vertical stability of the reserved grouting pipe 1. When the reserved grouting pipe 1 moves upward to the point where the limit column 20 is just one-to-one engaged with the groove 17 of the fixing seat 12, the reserved grouting pipe 1 no longer moves upward. At this time, the grouting plate 11 is just flush with the top plate of the metal box 2, the grouting is stopped, and the grouting port is sealed. At this time, under the action of the constant tension of the support rod 14 and the pull rope 18, combined with the upward rebound force of the elastic block 13, the grouting plate 11 will not continue to move upward, and the reserved grouting pipe 1 and the grouting plate 11 are engaged with each other, for example, the lower end of the reserved grouting pipe 1 is engaged with the depression on the upper surface of the grouting plate 11 or the two are adhesively connected, and the reserved grouting pipe 1 always maintains a vertically stable state until the curing stage is completed. When the plugging slurry solidifies and meets the maintenance period, the reserved grouting pipe 1 can be removed by simply cutting the pull rope 18, which is very convenient.

[0066] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A shield tunnel segment crack plugging device, characterized in that: include: A metal box, comprising a top plate, a pair of first side plates, a pair of second side plates and a bottom plate, wherein the top plate and the pair of first side plates are both square and the pair of first side plates are respectively fixed relatively to the two sides of the top plate, the pair of second side plates are V-shaped and are respectively fixed relatively to the other two sides of the top plate, the bottom plate is welded by two square plates in an inverted V shape and fixed to the bottom edges of the pair of first side plates, the pair of first side plates are both in a matrix and symmetrically provided with a plurality of reserved grouting holes, the top plate is provided with grouting holes, the metal box is made of a flexible steel sheet; the second side plate is welded by two right-angled triangular plates; the height of the first side plate is equal to the length of the hypotenuse of the second side plate; the second side plate and the bottom plate are both symmetrical V-shaped structures; A grouting pipe is reserved, which is vertically sealed and connected to the grouting hole; The rubber sleeves are in plurality and are respectively sleeved on the outer circumference of the metal box to seal and cover the plurality of reserved grouting holes.

2. The shield tunnel segment crack plugging device according to claim 1, characterized in that: The metal box is welded into one piece through a top plate, a side plate and a bottom plate, and the reserved grouting pipe is also welded to the metal box.

3. The shield tunnel segment crack plugging device according to claim 1, characterized in that: The grouting hole is located at the center of the top plate.

4. The shield tunnel segment crack plugging device according to claim 3, characterized in that: The reserved grouting pipe is vertically inserted into the grouting hole and close to the inner wall of the grouting hole. The upper part of the reserved grouting pipe is evenly spaced along its circumference and provided with a plurality of through holes. The material of the part of the reserved grouting pipe close to the through holes is set as an elastic material. The lower part of the reserved grouting pipe is also evenly spaced along its circumference and provided with a plurality of channels, wherein a horizontal elastic member is arranged. The length of the elastic member in a free state is greater than the length of the channel. The invention also includes: A fixed pipe, the inner diameter of which is the same as the diameter of the grouting hole and the axis of which coincides with the axis of the grouting hole, the upper end of which is fixed to the lower surface of the top plate of the metal box; A fixing seat, which is a circular convex structure with a hollow interior, is just sleeved on the outside of the reserved grouting pipe and is located on the upper surface of the metal box top plate, a plurality of elastic blocks are fixed on the boss of the fixing seat, a plurality of mounting seats are fixed on the upper surface of the fixing seat, and a shaft rod is mounted thereon, and a plurality of inwardly concave grooves are arranged on the inner wall of the fixing seat facing the reserved grouting pipe, which respectively correspond to a plurality of elastic members; The support rods are multiple and are rotatably sleeved on the shaft rods respectively. The limit rods are connected to the hinges, and the hinges are configured to slide along the length direction of the support rods so that the limit rods are slidably hinged on the support rods. The lower ends of the limit rods are fixedly connected to the elastic blocks. The other ends of the multiple support rods respectively pass through the multiple through holes and are located inside the reserved grouting pipes. A grouting plate, which is slidably arranged close to the inner wall of the fixed pipe, and the grouting plate is arranged close to the lower end of the reserved grouting pipe; A plurality of pull ropes are provided, one end of each of the pull ropes is respectively fixed to the other end of each of the plurality of support rods, and the other ends of each of the pull ropes are respectively tightened and fixed on the grouting plate vertically downward.

5. The shield tunnel segment crack plugging device according to claim 4, characterized in that: The elastic part includes a limit column, a spring and a limit plate which are arranged in sequence from the outer wall to the inner wall of the reserved grouting pipe, and the two ends of the spring are respectively connected to the limit column and the limit plate, and the limit column is exactly matched with the groove. The upper surface of the limit plate has a downwardly concave annular groove, and also includes a retaining ring, which is formed by the upper edge of the sleeve extending horizontally outward and then bending downward. When the limit column is completely located in the reserved grouting pipe and the limit plate compresses the spring, the retaining ring is vertically close to the limit plate and the downwardly bent part is exactly located in the annular groove.

6. A method for sealing cracks in shield tunnel segments using the shield tunnel segment crack sealing device according to any one of claims 1 to 5, characterized in that: The steps include: S1: Locate the cracks in the pipe segments and clean them up; S2: tilting a pair of first side plates toward a pair of second side plates so that the side surface of the metal box is tapered and the bottom plate is merged in a V shape, and at the same time, a rubber sleeve is used to cover and enclose the reserved grouting holes on the metal box; S3: Insert the metal box into the crack of the pipe segment in a cone shape to the bottom of the crack; S4: Connect the grouting nozzle of the pinhole grouting pump to the reserved grouting pipe, and inject the plugging slurry into the plugging device through the reserved grouting pipe until the rubber sleeve is expanded and the cracks in the pipe segment are filled with the plugging slurry; S5: After the plugging slurry solidifies and meets the maintenance period, remove the reserved grouting pipe and smooth the surface of the pipe segment.

7. The shield tunnel segment crack plugging construction method according to claim 6, characterized in that: Before step S3, it also includes fixing the fixed pipe in the metal box, and connecting the fixed seat, support rod, grouting plate, pull rope and related parts of the reserved grouting pipe; after step S4, it also includes stopping grouting and sealing the reserved grouting pipe when the slurry pushes the grouting plate to move up to the top plate of the metal box and the limit column is engaged into the groove; step S5 includes cutting off the pull rope and taking away the reserved grouting pipe and related parts of the fixed seat after the plugging slurry solidifies and meets the maintenance period.

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