A sealing and anti-retreating device for a pipe segment grouting hole and a grouting method using the device

Abstract

The present application relates to the technical field of tunnel engineering, in particular to a sealing and anti-retreating device for segment grouting hole and a grouting method using the device. The device comprises a grouting pipe and a sealing plug. The grouting pipe has an open end facing the tunnel. The sealing plug is arranged in the open end. The sealing plug comprises a stud and a cap. The cap is provided with a mounting groove. The mounting groove is provided with a breakable anti-retreating ring. The mounting groove is provided with a limiting structure for fixing the anti-retreating ring. The anti-retreating ring is formed with an anti-retreating tooth group one. The grouting pipe is provided with an anti-retreating tooth group two corresponding to the anti-retreating tooth group one. The hardness and strength of the anti-retreating ring and the anti-retreating tooth group one are lower than those of the anti-retreating tooth group two. The two anti-retreating tooth groups cooperate with each other to improve the ability of the sealing plug to prevent loosening, removal and rotation. The breakable anti-retreating ring allows the sealing plug to be removed without damaging the grouting pipe, greatly reducing the difficulty and cost of operation and maintenance.

Description

Technical Field

[0001] This invention relates to the field of tunnel engineering technology, specifically to a sealing and anti-retrogression device for grouting holes in tunnel segments and a grouting method using the device. Background Technology

[0002] In shield tunnel construction, it is usually necessary to drill holes in the shield segments for backfilling grouting for water sealing or reinforcement. Currently, the common technical solution is to pre-embed grouting pipes in the segment structure and install grouting check valves and grouting hole sealing plugs. When backfilling is required, the check valve is installed first, and then the concrete layer outside the pre-embedded grouting pipe needs to be drilled through for grouting. After the shield tunnel is operational, the sealing plugs (screw caps) may detach under long-term external water pressure and train vibration, leading to significant water leakage or even gushing, posing a significant challenge to operational safety. To avoid the risk of sealing plug detachment, some operating lines have required the complete removal of sealing plugs and the use of micro-expansion cement grout for sealing. However, the micro-expansion cement sealing method makes it difficult to test the filling material and density within the holes. Large-scale adoption makes it difficult to guarantee the construction quality of each grouting hole, and there is still a risk of poor-quality sealing cement grout or shrinkage, leading to water leakage or even the entire cement grout being washed out, making the risk uncontrollable.

[0003] Therefore, there is still considerable room for improvement and optimization in terms of sealing performance and ease of inspection and maintenance of the sealing device for segment grouting pipes. Summary of the Invention

[0004] To address the problem of loosening and leakage of grouting hole sealing plugs, this invention provides a sealing and anti-retraction device for grouting holes in tunnel lining segments and a grouting method using this device. It has comprehensive advantages such as reliable sealing and waterproofing performance, anti-loosening and anti-retraction protection against vibration, easy inspection, and convenient maintenance.

[0005] To achieve the above objectives, the present invention provides a sealing and anti-retrograde device for grouting holes in tunnel segments, comprising a grouting pipe and a sealing plug. The end of the grouting pipe facing the tunnel is open, and the sealing plug is disposed in the opening. The sealing plug includes a stud screwed to the opening and a cap disposed at the end of the stud. The cap is provided with an installation groove, and a destructible anti-retrograde retaining ring is provided in the installation groove. A limiting structure for fixing the anti-retrograde retaining ring is provided in the installation groove. An anti-retrograde tooth assembly 1 is formed on the end face of the anti-retrograde retaining ring facing the grouting pipe. An anti-retrograde tooth assembly 2 is provided on the grouting pipe corresponding to the anti-retrograde tooth assembly 1. The hardness and strength of the anti-retrograde retaining ring and the anti-retrograde tooth assembly 1 are both lower than the hardness and strength of the anti-retrograde tooth assembly 2.

[0006] Preferably, the anti-retraction tooth assembly 2 and the grouting pipe are integrally formed.

[0007] Preferably, both the second anti-retraction tooth group and the first anti-retraction tooth group include multiple locking teeth. The angle between the tooth surface of the locking tooth group one facing away from the screw-in direction and the reference surface is greater than the angle between the tooth surface of the other side and the reference surface.

[0008] Preferably, the limiting structure includes an annular groove formed on the side wall of the mounting groove, and the side wall of the anti-reverse retaining ring is provided with a protruding ring that matches the annular groove.

[0009] Preferably, the limiting structure further includes at least two limiting blocks protruding from the bottom of the mounting groove, and the bottom of the anti-reverse retaining ring is provided with a limiting groove that matches the limiting blocks.

[0010] Preferably, the limiting grooves are symmetrically arranged on the anti-reverse retaining ring, and the limiting blocks are symmetrically arranged on the mounting groove.

[0011] Preferably, the limiting block is provided at the bottom of the mounting groove along the radial direction of the cap.

[0012] Preferably, the sealing plug has a water-swellable sealing ring on its peripheral wall.

[0013] Preferably, the anti-reverse retaining ring is provided with a first mark, and the sealing plug is provided with a second mark, wherein the first mark is configured to align with the second mark when the sealing plug is tightened.

[0014] The present invention also provides a grouting method using a sealing and anti-retrograde device, wherein the sealing and anti-retrograde device is the sealing and anti-retrograde device for the grouting hole of the segment as described in any one of the above claims, and the grouting method includes the following steps:

[0015] Before grouting, a temporary sleeve is screwed into the pre-embedded grouting pipe. One end of the temporary sleeve is provided with an external thread that matches the opening of the grouting pipe. The length of the external thread is greater than or equal to the length of the stud of the sealing plug. The hardness and strength of the temporary sleeve are greater than those of the grouting pipe. When screwing it in, ensure that the external thread of the temporary sleeve is completely screwed into the grouting pipe before proceeding with the grouting operation.

[0016] After the grouting operation is completed, remove the temporary sleeve and then screw the sealing plug into the grouting pipe. When the first anti-retraction tooth assembly and the second anti-retraction tooth assembly abut against each other, the installation is complete.

[0017] Compared with the prior art, the present invention has the following advantages: by setting a destructible anti-retraction retaining ring on the sealing plug, and setting anti-retraction tooth groups on the anti-retraction retaining ring and the grouting pipe respectively, the two sets of anti-retraction tooth groups cooperate with each other to improve the sealing plug's ability to prevent loosening and rotation. The destructible anti-retraction retaining ring allows the sealing plug to be removed without damaging the grouting pipe, and a new sealing plug can be used to re-seal the pipe. The effect of secondary sealing is almost the same as that of the first sealing, which greatly reduces the difficulty of operation and maintenance, significantly reduces the cost of tunnel repair and maintenance, and has obvious economic benefits throughout its entire life cycle. Attached Figure Description

[0018] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0019] Figure 1 This is a schematic diagram of the sealing device for the grouting pipe of the segment provided in an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the tube structure provided in an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the tail plug structure provided in an embodiment of the present invention;

[0022] Figure 4 This is an isometric view of the sealing plug provided in an embodiment of the present invention;

[0023] Figure 5 This is a half-sectional schematic diagram of the sealing plug provided in an embodiment of the present invention;

[0024] Figure 6 yes Figure 5 A magnified view of a portion of point A in the middle;

[0025] Figure 7 This is a schematic diagram of the anti-reverse retaining ring provided in an embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of the structure of the temporary installation sleeve of the present invention.

[0027] List of reference numerals in the attached diagram:

[0028] 100. Grouting pipe; 110. Pipe body; 120. Tail plug; 130. Anti-retraction tooth assembly two; 140. Opening;

[0029] 200. Sealing plug; 210. Stud; 220. Cap; 221. Mounting groove; 222. Annular groove; 223. Limiting block; 240. Second mark;

[0030] 300. Anti-reverse retaining ring; 310. Anti-reverse tooth assembly one; 320. Convex ring; 330. Limiting groove; 350. First mark;

[0031] 400. Water-swellable sealing ring;

[0032] 500. Temporary pipe sleeve;

[0033] 600. Check valve. Detailed Implementation

[0034] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the invention. It should be understood that the described embodiments are merely some, not all, of the embodiments described in this application. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort are within the scope of protection of this application.

[0035] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0036] In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims. In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. The invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0039] like Figure 1-7As shown, in order to solve the problems and hidden dangers of the current sealing device for grouting pipes in the sealing of grouting holes of tunnel segments, and to make it have the comprehensive advantages of reliable sealing and waterproof performance, anti-loosening and anti-retraction, vibration resistance, and easy inspection and maintenance, this embodiment discloses a sealing and anti-retraction device for grouting holes of tunnel segments. It can be applied to the sealing technology of pre-embedded grouting holes of various types of tunnel segments, and can also be used in jacking joints, prefabricated structures, open-cut structures and other parts that require pre-embedded grouting pipes to facilitate later grouting behind the wall or slab. The sealing and anti-retraction device for grouting holes of tunnel segments includes a grouting pipe 100 and a sealing plug 200. The grouting pipe 100 includes a tail plug 120, a pipe body 110 and a check valve 600. One end of the tube body 110 is an opening 140, and the other end connects to the tail plug 120. The tube body 110 has approximately eight internal threads extending from the opening 140 to the tail plug 120. The tube body 110 is pre-embedded within the segment structure during segment production. The opening 140 faces the inside of the segment. The tube body 110 should be made of a material with high hardness, corrosion resistance, and wear resistance, such as polyamide (PA) (e.g., engineering plastics like polyimide or polyurethane, or composite materials like carbon fiber or polymers). The external structure has protrusions to ensure sufficient bonding force with the concrete. A water-stop rubber ring is installed at the interface with the grouting tail plug 120. The tail plug 120 is a tubular structure connected to the tube body 110. The end of the tail plug 120 furthest from the tube body 110 is closed. The tail plug 120 is pre-embedded within the segment structure during segment production and should preferably be made of a material with flexibility, corrosion resistance, and water-stopping properties, such as polypropylene (PP) (e.g., polyethylene, polyvinyl chloride, chlorinated polyethylene). The check valve 600 has external threads that match the internal threads of the pipe body 110. It is installed inside the pipe body 110 and near the end of the tail plug 120. It should be made of a material with certain toughness, such as copolymer polypropylene (PP-R), which takes into account both elastic deformation and strength. It must be installed in advance before drilling and grouting. The raft flap opens without being damaged during grouting drilling. When the grout flows, the raft flap is pressed back and closed, which prevents the grout from entering the interior of the pipe body 110.

[0040] like Figure 4As shown, the sealing plug 200 includes a stud 210 and a cap 220. The cap 220 serves as a base, and the stud 210 has five threads that match the internal thread of the pipe body 110. The sealing plug 200 is screwed to one end of the opening 140 of the pipe body 110 via the stud 210. To ensure that the sealing plug 200 does not loosen under long-term vibration, an anti-retraction tooth group 1 310 is provided on the cap 220 of the sealing plug 200, and a corresponding anti-retraction tooth group 2 130 is provided on the grouting pipe 100. Both the anti-retraction tooth group 1 310 and the anti-retraction tooth group 2 130 are annular, and each anti-retraction tooth group 1 310 and the anti-retraction tooth group 2 130 consists of multiple locking teeth forming a tooth group. The angle between one side of the tooth surface and the reference plane of a single locking tooth is greater than the angle between the other side of the tooth surface and the reference plane, i.e. The pressure angles of the meshing tooth surfaces on both sides of a single locking tooth are different, causing the locking teeth in the tooth assembly to be arranged in a downward-facing stepped pattern. That is, the locking teeth form slopes of different angles and lengths on both sides. The locking teeth in the first anti-retraction tooth assembly 310 and the second anti-retraction tooth assembly 130 are arranged in opposite directions. When the first anti-retraction tooth assembly 310 and the second anti-retraction tooth assembly 130 are engaged, the sealing plug 200 can only rotate in one direction, which can ensure that the sealing plug 200 will not reverse under long-term vibration, thus achieving the effect of not loosening and not failing. In addition to locking teeth, the anti-retraction tooth assembly can be a unidirectional tooth structure such as ratchet teeth or wedge teeth.

[0041] like Figure 5 , 6 As shown, in order to enhance the waterproof sealing performance of the sealing plug 200, a groove is provided on the outer edge of the cap 220 of the sealing plug 200. A water-swellable sealing ring 400 can be installed on the groove. The tightly interlocking threads and the water-swellable sealing ring 400 can ensure that no leakage occurs and no failure occurs under the long-term action of the design water pressure of the sealing plug 200.

[0042] Furthermore, to facilitate subsequent operation, maintenance, and random inspection confirmation, a ruptureable anti-reverse retaining ring 300 is provided on the sealing plug 200; an installation groove 221 is opened on the edge of the cap 220 near the stud 210, and the anti-reverse retaining ring 300 is fitted into the installation groove 221 of the cap 220, such as... Figure 7As shown, the anti-retraction tooth assembly 310 is integrated with the anti-retraction retaining ring 300. The hardness and strength of the anti-retraction tooth assembly 310 are lower than those of the anti-retraction tooth assembly 130. The anti-retraction retaining ring 300 and the anti-retraction tooth assembly 310 should be made of a material with certain toughness, such as copolymer polypropylene (PP-R), which balances elastic deformation and strength. Meanwhile, to improve the strength of the anti-retraction tooth assembly 130, it is integrally formed with the pipe body 110 of the grouting pipe 100. When unfilled voids are found behind the pipe wall, requiring the grouting hole to be reopened for grouting, [the following can be done]. Mechanical equipment is used to reverse-tighten the sealing plug 200. Because the hardness and strength of the grouting pipe 100 and the second anti-retraction tooth assembly 130 are greater than those of the first anti-retraction tooth assembly 310 and the anti-retraction retaining ring 300, the connection between the first anti-retraction tooth assembly 310 and the anti-retraction retaining ring 300 and the sealing plug 200 should form a weak point. As the torque applied to the sealing plug 200 continuously increases, the grouting pipe 100 and the second anti-retraction tooth assembly 130 are not significantly affected, while the first anti-retraction tooth assembly 310 will quickly reach its collapse threshold. Only after the first anti-retraction tooth assembly 310 is damaged can the sealing plug 200 be removed for grouting. After grouting is completed, a new sealing plug 200 can be used for resealing, while the grouting pipe 100 and the second anti-retraction tooth assembly 130 remain undamaged. The effect of the secondary sealing is almost identical to that of the initial sealing, greatly reducing the difficulty of operation and maintenance, significantly reducing tunnel repair and maintenance costs, and demonstrating significant economic benefits throughout its lifespan. In this embodiment, the mounting slot 221 is a complete ring, but in other forms it may be a ring segment, or not a ring, or multiple mounting slots 221.

[0043] Furthermore, to improve the convenience of subsequent operation, maintenance and spot checks, a first mark 350 is set on the anti-reverse retaining ring 300 and a second mark 240 is set on the sealing plug 200. When the anti-reverse retaining ring 300 and the sealing plug 200 are fully assembled, the first mark 350 and the second mark 240 are aligned. During maintenance, the deviation between the first mark 350 and the second mark 240 can be used to determine whether the sealing plug 200 has rotated back and the degree of rotation.

[0044] Furthermore, a limiting structure is provided between the anti-return retaining ring 300 and the sealing plug 200 to prevent them from moving up and down and rotating, so that the anti-return retaining ring 300 and the anti-returning tooth assembly can perform the function of preventing the sealing plug 200 from coming out.

[0045] The side wall of the mounting groove 221 is provided with an inwardly recessed annular groove 222, and the inner diameter side of the anti-retraction retaining ring 300 is provided with an annular protrusion 320, the size and shape of which correspond to the size and shape of the annular groove 222. When assembling the anti-reverse retaining ring 300 and the sealing plug 200, the anti-reverse tooth assembly 310 of the anti-reverse retaining ring 300 is facing upwards, and the stud 210 on the sealing plug 200 is passed through the inner ring of the anti-reverse retaining ring 300. The convex ring 320 of the anti-reverse retaining ring 300 is then engaged in the annular groove 222 of the cap 220. In this way, the anti-reverse retaining ring 300 and the sealing plug 200 are assembled. When the sealing plug 200 is about to come out in an adverse environment, the side wall of the annular groove 222 and the side wall of the convex ring 320 will abut against each other. The annular groove 222 and the convex ring 320 cooperate to restrict the anti-reverse retaining ring 300 and the sealing plug 200 from moving up and down. This prevents the anti-reverse tooth assembly 130 and the anti-reverse tooth assembly 310 from moving up and down and causing separation, so that the anti-reverse retaining ring 300 can detach from the sealing plug 200.

[0046] Based on this, in order to allow the anti-reverse retaining ring 300 to smoothly engage with the annular groove 222, rounding or chamfering can be applied to the bottom of the anti-reverse retaining ring 300 and the edge of the convex ring 320, or the same rounding or chamfering can be applied to the sealing plug 200.

[0047] To prevent the anti-reverse retaining ring 300 from rotating relative to the sealing plug 200, and to allow the anti-reverse retaining ring 300 and the first anti-reverse tooth assembly 310 to better function on the sealing plug 200, a limiting block 223 is provided at the bottom of the mounting groove 221. The bottom of the anti-reverse retaining ring 300 is provided with a limiting groove 330 that matches the limiting block 223. The size and shape of the limiting block 223 correspond to the size and shape of the limiting groove 330. The limiting groove 330 and the limiting block 223 cooperate with each other to restrict the anti-reverse retaining ring 300 and the sealing plug 200 from rotating up and down relative to each other, and to prevent the second anti-reverse tooth assembly 130 and the first anti-reverse tooth assembly 310 from separating.

[0048] In use, after the anti-retraction retaining ring 300 and the sealing plug 200 are assembled, the limiting block 223 and the limiting groove 330 are in a mutually interlocking state. If the sealing plug 200 is about to retract in an adverse environment, the shorter side of the tooth surface on the anti-retraction tooth group 2 130 on the grouting pipe 100 abuts against the shorter side of the tooth surface on the anti-retraction tooth group 1 310 on the anti-retraction retaining ring 300. At this time, the anti-retraction tooth group 1 310 and the anti-retraction tooth group 2 130, which are in a meshing state, can only be separated by rotating the anti-retraction retaining ring 300 and the sealing plug 200 clockwise or moving radially. However, the properly installed sealing plug 200 can no longer be screwed into the grouting pipe 100. The limiting block 223 jams the limiting groove 330, preventing the anti-retraction retaining ring 300 from rotating independently. Therefore, the anti-retraction tooth group 1 310 and the anti-retraction tooth group 2 130 cannot be separated by rotating left and right, thus preventing the sealing plug 200 from retracting.

[0049] To ensure the stability of the function of the limiting block 223 and the limiting groove 330, two limiting grooves 330 are provided. The number of limiting grooves 330 should not be excessive to avoid difficulty in breaking the connection between the anti-reverse retaining ring 330 and the sealing plug 200. The limiting grooves 330 are symmetrically arranged on the anti-reverse retaining ring 300, and the corresponding limiting block 223 is also symmetrically arranged on the mounting groove 221. This allows the anti-reverse retaining ring 300 to better prevent the sealing plug 200 from reversing. During subsequent maintenance, the sealing plug 200 can also better apply force to the anti-reverse retaining ring 300 to break it and replace the sealing plug 200.

[0050] Furthermore, the limiting block 223 is provided at the bottom of the mounting groove 221 and extends radially along the cap 220, so that the limiting block 223 is a long strip extending radially along the cap 220. When reversed, the sealing plug 200 can better exert force on the anti-reverse retaining ring 300 to destroy the anti-reverse retaining ring 300 and replace the sealing plug 200.

[0051] To prevent contamination of the threads of the grouting pipe 100 during the grouting operation, which could reduce the sealing performance of the sealing plug 200, such as... Figure 8 As shown, embodiments of the present invention also provide a grouting method using a sealing and anti-retrograde device for segment grouting holes. The construction process of this method is applicable to the sealing and anti-retrograde device for segment grouting holes in any of the above embodiments, including:

[0052] A reusable temporary sleeve 500 has an external thread at one end that matches the opening 140 of the grouting pipe 100. The length of the external thread is greater than or equal to the length of the stud 210. The hardness and strength of the temporary sleeve 500 are greater than those of the grouting pipe 100. The temporary sleeve 500 should preferably be made of steel to ensure its strength. The number of thread turns is consistent with that of the permanent sealing plug 200. It is equipped with external hexagonal or external thread connection methods to ensure that it can be completely unscrewed after grouting and reused.

[0053] Before grouting, a temporary sleeve 500 is installed on the pre-embedded grouting pipe 100, ensuring that the external thread of the temporary sleeve 500 is fully screwed into the grouting pipe 100 before proceeding with the grouting operation. During grouting, the other end of the temporary sleeve 500 that is not screwed into the grouting pipe 100 can be used to connect and fix devices such as grouting ball valves. If a small amount of water or grout overflows during grouting, the threads will not be contaminated by the grout under the protection of the temporary sleeve 500.

[0054] After grouting is completed, remove the temporary sleeve 500, and then screw the sealing plug 200 into the grouting pipe 100. Installation is complete when the anti-retraction tooth assembly 310 and the anti-retraction tooth assembly 130 abut against each other. According to the construction schedule, after preparing the permanent sealing plug 200, unscrew the temporary sleeve 500 and immediately install the sealing plug 200. The unscrewed temporary sleeve 500 can be used at the next segment opening grouting location. This sleeve, as a supporting device for the segment grouting pipe 100, can be used in conjunction with the grouting equipment, effectively protecting the threads from damage and contamination, and ensuring smooth and reliable subsequent installation of the sealing plug 200.

[0055] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A sealing and anti-retrogression device for grouting holes in tunnel segments, comprising a grouting pipe (100) and a sealing plug (200), wherein the grouting pipe (100) has an opening (140) at one end facing the tunnel, the sealing plug (200) is disposed in the opening (140), the sealing plug (200) comprises a stud (210) screwed to the opening (140) and a cap (220) disposed at the end of the stud (210), characterized in that, The cap (220) is provided with an installation groove (221), and the installation groove (221) is provided with a destructible anti-retraction retaining ring (300). The installation groove (221) is provided with a limiting structure for fixing the anti-retraction retaining ring (300). The end face of the anti-retraction retaining ring (300) facing the grouting pipe (100) is formed with an anti-retraction tooth group one (310). The grouting pipe (100) is provided with an anti-retraction tooth group two (130) corresponding to the anti-retraction tooth group one (310). The hardness and strength of the anti-retraction retaining ring (300) and its anti-retraction tooth group one (310) are both lower than the hardness and strength of the anti-retraction tooth group two (130).

2. The sealing and anti-retraction device for the grouting hole of the tunnel segment according to claim 1, characterized in that, The anti-retraction tooth assembly 2 (130) and the grouting pipe (100) are integrally formed.

3. The sealing and anti-retraction device for the grouting hole of the tunnel segment according to claim 1, characterized in that, Both the second anti-retraction tooth group (130) and the first anti-retraction tooth group (310) include multiple locking teeth. The angle between the tooth surface of the locking tooth group (310) facing away from the screw-in direction and the reference surface is greater than the angle between the tooth surface of the other side and the reference surface.

4. The sealing and anti-retraction device for the grouting hole of the tunnel segment according to claim 1, characterized in that, The limiting structure includes an annular groove (222) formed on the side wall of the mounting groove (221), and the side wall of the anti-reverse retaining ring (300) is provided with a protruding ring (320) that is adapted to the annular groove (222).

5. The sealing and anti-retraction device for the grouting hole of the tunnel segment according to claim 4, characterized in that, The limiting structure also includes at least two limiting blocks (223) protruding from the bottom of the mounting groove (221), and the bottom of the anti-reverse retaining ring (300) is provided with a limiting groove (330) that is adapted to the limiting block (223).

6. The sealing and anti-retraction device for the grouting hole of the tunnel segment according to claim 5, characterized in that, The limiting groove (330) is symmetrically arranged on the anti-reverse retaining ring (300), and the limiting block (223) is symmetrically arranged on the mounting groove (221).

7. The sealing and anti-retraction device for the grouting hole of the tunnel segment according to claim 5, characterized in that, The limiting block (223) is provided at the bottom of the mounting groove (221) and extends radially along the cap (220).

8. The sealing and anti-retraction device for the grouting hole of the tunnel segment according to claim 1, characterized in that, The sealing plug (200) is provided with a water-swellable sealing ring (400) on its peripheral wall.

9. The sealing and anti-retraction device for the grouting hole of the tunnel segment according to claim 1, characterized in that, The anti-reverse retaining ring (300) is provided with a first mark (350), and the sealing plug (200) is provided with a second mark (240). The first mark (350) is configured to align with the second mark (240) when the sealing plug (200) is tightened.

10. A grouting method employing a sealing and anti-retreat device, characterized in that, The sealing and anti-retrograde device is the sealing and anti-retrograde device for the grouting hole of the segment as described in any one of claims 1 to 9, and the grouting method includes the following steps: Before grouting, a temporary sleeve (500) is screwed into the pre-embedded grouting pipe (100). One end of the temporary sleeve (500) is provided with an external thread that matches the opening (140) of the grouting pipe (100). The length of the external thread is greater than or equal to the length of the stud (210) of the sealing plug (200). The hardness and strength of the temporary sleeve (500) are greater than the hardness and strength of the grouting pipe (100). When screwing in, ensure that the external thread of the temporary sleeve (500) is completely screwed into the grouting pipe (100), and then carry out the grouting operation. After the grouting operation is completed, remove the temporary sleeve (500), and then screw the sealing plug (200) into the grouting pipe (100). When the first anti-retraction tooth group (310) and the second anti-retraction tooth group (130) abut against each other, the installation is completed.

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