Method for treating water leakage of shield tunnel steel pipe piece

Abstract

The invention provides a shield tunnel steel pipe piece leakage water treatment method which comprises the following steps that grouting is conducted on an outer wall plate of a steel pipe piece, a waterproof partition layer is constructed, and a used grouting material comprises double-liquid slurry or oil-soluble polyurethane slurry; grouting at the water leakage position of the steel pipe sheet, wherein a used grouting material comprises hydrophilic rigid epoxy slurry or oil-soluble polyurethane slurry; sealing the surface of the steel pipe sheet; and carrying out anti-corrosion treatment on the inner wall surface of the steel pipe sheet. The water leakage problem of the shield tunnel steel pipe piece can be effectively solved, the treatment method is provided in a targeted mode for the water leakage problem of different parts of the steel pipe piece, and the durability of the tunnel steel pipe piece is improved.

Description

Technical Field

[0001] The invention relates to the technical field of shield tunnel construction, and in particular to a method for treating water leakage of steel pipe segments in a shield tunnel. Background Art

[0002] The shield method is a method used to build underground tunnels, especially for underground traffic passages or water supply and sewage treatment pipelines in cities. Tunnel steel pipe segments are circular or semicircular steel components used in the shield tunnel construction process. They constitute the inner wall of the tunnel and have the function of preventing groundwater or other liquids from penetrating into the tunnel and keeping the tunnel dry and safe. As the core part of the subway tunnel, the stability of the structural state of the connecting channel will directly affect the structural safety of the entire tunnel. If there are no reliable waterproof measures, groundwater will invade the tunnel, affect the tunnel structure and ancillary equipment, reduce its service life, and further affect the normal operation of the subway system and the safety of passengers. Therefore, it is also crucial to prevent the occurrence of water leakage and timely control the water leakage problem, especially for the tunnel steel pipe segments located in the connecting channel.

[0003] The existing technology mainly uses the method of drilling holes on the surface of the structure and pouring polyurethane slurry to plug the water leakage points in the steel pipe segment cavity and the water leakage points at the joints between the steel pipe segment and the concrete structure. However, this water leakage treatment method has a high re-leakage rate and is not effective, and it cannot cure the water leakage of the tunnel steel pipe segment. The reasons are analyzed mainly because: first, the existing treatment method does not open holes on the concrete segments around the steel pipe segment for wall grouting, and no waterproof barrier layer is formed behind the steel pipe segment to block the water leakage path, resulting in sporadic grouting plugging unable to block the water leakage path from the source; second, when grouting the steel pipe segment cavity, the drilling depth does not reach the inner surface of the backboard, resulting in the slurry failing to reach the expected position, and the grouting material uses polyurethane, which is easy to shrink and has poor durability, and cannot play the role of structural reinforcement; third, when grouting the surface of the water leakage at the joint between the steel pipe segment and the concrete structure, no sealing treatment is performed, resulting in slurry loss and poor repair effect. All of the above problems result in the existing water leakage treatment methods having a high re-leakage rate and failing to achieve the desired treatment effect. Summary of the invention

[0004] The purpose of the present invention is to provide a method for controlling water leakage of steel pipe segments in a shield tunnel to solve the above-mentioned problems. It can effectively solve the problem of water leakage of steel pipe segments in a shield tunnel, and propose targeted control methods for the water leakage problems in different parts of the steel pipe segments, thereby improving the durability of the tunnel steel pipe segments.

[0005] The present invention provides a method for treating water leakage of a steel pipe segment in a shield tunnel, comprising the following steps:

[0006] Step S1, grouting the outer wall of the steel pipe segment to construct a waterproof barrier layer, wherein the grouting material used includes double liquid slurry or oil-soluble polyurethane slurry;

[0007] Step S2, grouting at the water leakage position of the steel pipe segment, the grouting material used includes hydrophilic rigid epoxy slurry or oil-soluble polyurethane slurry;

[0008] Step S3, sealing the surface of the steel pipe segment;

[0009] Step S4: performing anti-corrosion treatment on the inner wall surface of the steel pipe segment.

[0010] In one embodiment, the step S1 further includes determining the overall thickness of the steel pipe segment according to the design drawings.

[0011] In one embodiment, both step S1 and step S2 further include setting the grouting pressure, and determining whether the grouting is terminated according to the grouting pressure.

[0012] In one embodiment, the grouting pressure of the rear grouting of the outer wall plate of the steel pipe segment in step S1 is not greater than 0.3 MPa, and the grouting is stopped when the grouting pressure is greater than 0.3 MPa.

[0013] In one embodiment, when the location of water leakage in the tunnel steel pipe segment is the joint between the steel pipe segment and the connecting channel structure, the step S2 specifically includes: using hydrophilic rigid epoxy slurry for drilling grouting, the grouting pressure is not greater than 0.4MPa, and the grouting is stopped when the grouting pressure is greater than 0.4MPa or the surrounding structure has been leaking slurry for 3 minutes.

[0014] In one embodiment, when the location of water leakage in the tunnel steel pipe segment is the steel pipe segment cavity, the step S2 specifically includes: using hydrophilic rigid epoxy slurry for drilling grouting, the grouting pressure is not greater than 0.2MPa, and the grouting is stopped when the grouting pressure is greater than 0.2MPa or the surrounding structure has been leaking slurry for 3 minutes.

[0015] In one embodiment, when the location of water leakage in the tunnel steel pipe segment is the joint of the steel pipe segment, the step S2 specifically includes: using oil-soluble polyurethane slurry to perform seam drilling grouting, the grouting pressure is not greater than 0.5MPa, and the grouting is stopped when the grouting pressure is greater than 0.5MPa or the slurry seeps out of the assembly joints of the surrounding steel pipe segments for 3 minutes.

[0016] In one embodiment, the step S3 specifically includes: using epoxy putty to seal the joints and / or annular seams of the steel pipe segments after grouting.

[0017] In one embodiment, step S4 specifically includes: applying three coats of polymer rust layer passivator on the inner wall surface of the steel pipe segment for anti-corrosion treatment.

[0018] In one embodiment, the step S4 further includes grinding and removing rust from the inner wall surface of the steel pipe segment before the anti-corrosion treatment.

[0019] Compared with the prior art, the method for treating water leakage in a shield tunnel steel pipe segment of the present invention has the following beneficial effects:

[0020] 1) The present invention can effectively solve the problem of water leakage of shield tunnel steel pipe segments, and specifically proposes treatment methods for water leakage at the joints between tunnel steel pipe segments and connecting channel structures, water leakage in the tunnel steel pipe segment cavity, and water leakage at the joints of tunnel steel pipe segments, thereby protecting the integrity of the tunnel structure and improving the durability of the tunnel steel pipe segments.

[0021] 2) The present invention can maintain the stability and safety of the tunnel structure, reduce the risk of accidents and structural failures, extend the service life of the tunnel, and ensure the continuous and reliable operation of the transportation system.

[0022] 3) The present invention can effectively reduce the number of times the water leakage problem recurs after being treated, thereby reducing the cost of multiple repairs and restorations in the future. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The present invention is a flowchart of a method for treating water leakage in a steel pipe segment of a shield tunnel according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the specific embodiments described herein are used to help understand the present invention, but do not constitute a limitation of the present invention.

[0025] The present invention proposes a method for treating water leakage of steel pipe segments in a shield tunnel. Figure 1 As shown, the following steps are included:

[0026] Step S1, grouting behind the outer wall of the steel pipe segment to construct a waterproof barrier layer to protect the integrity of the tunnel structure, improve the waterproof performance, and prevent leakage problems from occurring again. The grouting material used includes double liquid slurry or oil-soluble polyurethane slurry;

[0027] Step S2, grouting at the water leakage position of the steel pipe segment, the grouting material used includes hydrophilic rigid epoxy slurry or oil-soluble polyurethane slurry;

[0028] Step S3, sealing the surface of the steel pipe segment;

[0029] Step S4: performing anti-corrosion treatment on the inner wall surface of the steel pipe segment.

[0030] The following is a detailed explanation of the methods for treating water leakage in steel pipe segments of shield tunnels.

[0031] In one embodiment of the present invention, step S1 further includes determining the overall thickness of the steel pipe segment according to the design drawing. The overall thickness of the steel pipe segment is the sum of the thickness of the end plate of the steel pipe segment and the thickness of the inner and outer wall plates, the outer wall plate is the pipe wall with a larger arc radius and in contact with the soil or rock around the tunnel; the inner wall plate is the pipe wall with a smaller arc radius and in contact with the air or water inside the tunnel.

[0032] In one embodiment of the present invention, both step S1 and step S2 further include setting the grouting pressure, and determining whether the grouting is terminated according to the grouting pressure.

[0033] In step S1 of one embodiment of the present invention, the grouting pressure of the grouting behind the outer wall of the steel pipe segment is not greater than 0.3 MPa, and the grouting is stopped when the grouting pressure is greater than 0.3 MPa. MPa is the abbreviation of Megapascal, which is a pressure unit in the International System of Units (SI system).

[0034] In one embodiment of the present invention, when the location of water leakage in the tunnel steel pipe segment is the joint between the steel pipe segment and the connecting channel structure, step S2 specifically includes: using hydrophilic rigid epoxy slurry to perform drilling grouting, the grouting pressure is not greater than 0.4MPa, and the grouting is stopped when the grouting pressure is greater than 0.4MPa or the surrounding structure has been leaking slurry for 3 minutes.

[0035] In one embodiment of the present invention, when the location of water leakage in the tunnel steel pipe segment is the steel pipe segment cavity, step S2 specifically includes: using hydrophilic rigid epoxy slurry for drilling grouting, the grouting pressure is not greater than 0.2MPa, and the grouting is stopped when the grouting pressure is greater than 0.2MPa or the surrounding structure has been leaking slurry for 3 minutes.

[0036] In one embodiment of the present invention, when the location of water leakage in the tunnel steel pipe segment is the joint of the steel pipe segment, step S2 specifically includes: using oil-soluble polyurethane slurry to perform seam drilling grouting, the grouting pressure is not greater than 0.5MPa, and the grouting is stopped when the grouting pressure is greater than 0.5MPa or the slurry seeps out of the assembly joints of the surrounding steel pipe segments for 3 minutes.

[0037] Step S3 of an embodiment of the present invention specifically includes: using epoxy putty to seal the joints and / or annular seams of the steel pipe segments after grouting.

[0038] Step S4 of an embodiment of the present invention specifically includes: applying three coats of a polymer rust layer passivator on the inner wall surface of the steel pipe segment for anti-corrosion treatment.

[0039] Step S4 of an embodiment of the present invention further includes grinding and removing rust from the inner wall surface of the steel pipe segment before the anti-corrosion treatment.

[0040] The following describes in detail three situations: water leakage at the joints between tunnel steel pipe segments and connecting channel structures, water leakage in the tunnel steel pipe segment cavity, and water leakage at the joints of tunnel steel pipe segments.

[0041] Case 1: Water leakage at the joints between the tunnel steel pipe segments and the connecting channel structure.

[0042] The joints between the tunnel steel pipe segments and the connecting channel structure are prone to water leakage because the construction technology of the connecting channel is relatively special. During the construction period, it is difficult for the steel pipe segments at the connecting channel to form a tight connection with the channel structure body, or uneven settlement occurs in the subsequent melting and grouting stage, causing cracks between the two structures, thereby causing groundwater to flow into the tunnel through the cracks and cause water leakage.

[0043] For water leakage at the joints between the tunnel steel pipe segments and the connecting channel structure, drilling and grouting can be considered to reinforce and fill the gaps or cracks between the two structures. The core process is that the drilling depth should reach the effective position before effective treatment can be carried out, which includes the following steps:

[0044] 1) Grouting behind the wall: According to the design drawings, the overall thickness of the steel pipe segment is determined to be 35 cm in total, and double liquid slurry or oil-soluble polyurethane slurry is used for grouting behind the wall to construct a waterproof insulation layer;

[0045] 2) Locate and determine the drilling location at the door opening of the communication passage;

[0046] 3) Carry out seam sealing treatment at the joint between the inner arc surface of the steel pipe segment end plate and the communication channel structure to ensure that the slurry can fully fill the gap between the steel pipe segment and the communication channel structure;

[0047] 4) According to the layout hole position, drill a hole from the side wall of the communication channel doorway (the net depth of the doorway is 35cm) to the connection point between the steel pipe wall and the communication channel structure.

[0048] 5) Determine the drilling depth and hole spacing: the drilling depth is 15 cm and the hole spacing is 30 cm;

[0049] 6) Install the grouting nozzle;

[0050] 7) Use electric grouting pump for chemical grouting: hydrophilic rigid epoxy grout is used as grouting liquid to effectively bond and fill the gaps and cracks between the steel pipe segments and the connecting channel structure; the grouting pressure is not more than 0.4MPa, and the principle of setting the grouting pressure is to use low pressure so that the grouting liquid can slowly and fully fill the gaps in the structure; the grouting sequence should be the method of first bottom and then top; stop grouting when the grouting pressure is greater than 0.4MPa or the surrounding structure seeps out grouting liquid for 3 minutes;

[0051] 8) Use epoxy putty for sealing;

[0052] 9) Grind and remove rust from the inner curved steel ribs of the steel pipe segment as a whole until there is no visible grease and dirt on the surface, and no loosely attached rust, oxide scale or paint coating, etc.;

[0053] 10) After rust removal, apply polymer rust passivator three times to improve the durability of the tunnel steel pipe segment.

[0054] It should be noted that "layout" is a construction engineering term, which refers to marking and measuring at the actual construction site according to the dimensions and requirements on the design drawings to determine the specific location, dimensions and coordinates. In this embodiment, the specific location of the communication channel door opening is measured and marked according to the design requirements and drawings to determine the location of the drill hole. This is to ensure that the accuracy and location of the drill hole meet the design requirements so that the subsequent drilling and grouting work can be carried out correctly.

[0055] Epoxy putty is a high-strength, high-adhesion material that can adapt to concrete crack repair in various environments. It can not only effectively seal cracks, but also prevent moisture and air from entering the cracks, thereby protecting the concrete structure from erosion and ensuring the durability of the repair effect.

[0056] Polymer rust layer passivation agent is a chemical treatment agent used to improve the corrosion resistance of metal materials (such as steel). It can react chemically with the metal surface to form a protective polymer film. This film can reduce the corrosion rate of the metal surface and reduce the contact between the metal and the external environment (such as water, oxygen, and chemicals), thereby reducing the occurrence of corrosion. The purpose of using polymer rust layer passivation agents in metal components such as tunnel steel pipe segments is to reduce or inhibit metal corrosion, thereby extending the service life and durability of the components.

[0057] Case 2: Water leakage in the cavity of the tunnel steel pipe segment.

[0058] The reason for water leakage in the tunnel steel pipe segment cavity may be that there are quality problems with the original freezing pipe sealing in the steel pipe segment cavity, which causes groundwater in the soil layer to enter the cavity through the original sealing joints, and flow into other cavities through the gaps welded between the steel ribs, and finally flow into the tunnel through the gaps filled with concrete and sealed steel plates, causing water leakage.

[0059] For water leakage in the tunnel steel pipe segment cavity, consider grouting the adjacent concrete segments (standard blocks and adjacent blocks) behind the wall, first form a waterproof layer at the junction of the segment wall and the communication channel structure, then drill holes and grout in the steel pipe segment cavity, and finally weld a 12mm steel plate on the surface of the steel pipe segment. The specific steps include the following:

[0060] 1) Drill holes for reserved grouting holes on the concrete segments adjacent to both sides of the steel segments, and install orifice pipes and grouting ball valves;

[0061] 2) Install and debug the gear grouting pump;

[0062] 3) Use a gear grouting pump for chemical grouting behind the wall: determine the overall thickness of the steel pipe segment according to the design drawings, and use double liquid slurry or oil-soluble polyurethane slurry to perform back-wall grouting on the adjacent concrete pipe segments. The back-wall grouting pressure shall not exceed 0.3MPa. When the back-wall grouting pressure exceeds 0.3MPa, stop grouting. The back-wall grouting volume of each concrete pipe segment shall not exceed 100kg;

[0063] 4) Cut off the steel plate used to seal the inner arc surface of the original steel pipe segment;

[0064] 5) According to the design drawings, the depth of the steel pipe cavity is determined to be 33 cm. Drill holes 33 cm along the water outlet to the back plate of the steel pipe. Two holes are arranged in one cavity with a hole spacing of 20 cm;

[0065] 6) Install the grouting nozzle;

[0066] 7) Use an electric grouting pump for chemical grouting: Use hydrophilic rigid epoxy slurry to grout the steel pipe segment cavity to effectively bond and fill the filling concrete in the steel pipe segment cavity or the failed parts of the original frozen pipe. The grouting sequence is to first grout the grouting nozzles at the leakage points of the steel pipe segment cavity, and then perform additional grouting at the grouting nozzles around the cavity; the grouting pressure of the steel pipe segment cavity is not greater than 0.2MPa, so that the slurry can slowly and fully fill the connection between the original frozen pipe and the steel pipe segment back plate; stop grouting when the grouting pressure of the steel pipe segment cavity is greater than 0.2MPa or the surrounding structure has been leaking slurry for 3 minutes;

[0067] 8) Weld 12mm steel plate on the surface of the steel pipe segment, with a weld height of 8mm;

[0068] 9) Use epoxy putty for sealing;

[0069] 10) Grind and remove rust from the inner curved steel ribs of the steel pipe segment as a whole until there is no visible grease and dirt on the surface, and no loosely attached rust, oxide scale or paint coating;

[0070] 11) After rust removal, apply polymer rust passivator three times to improve the durability of the tunnel steel pipe segment.

[0071] Case 3: Water leakage at the joints of the tunnel steel pipe segments.

[0072] The reason for water leakage in the joints of tunnel steel pipe segments may be quality problems during the assembly process of the steel pipe segments, the gap between the steel pipe segment joints is too large or its own elastic rubber sealing pads and water retaining strips are damaged, resulting in a decrease in its waterproof performance, causing groundwater in the outer soil layer to flow into the tunnel through the steel pipe segment joints and cause water leakage.

[0073] In order to prevent water leakage at the joints of tunnel steel segments, grouting behind the adjacent concrete segments (standard segments and adjacent segments) can be considered. First, a waterproof layer is formed at the junction of the segment wall and the communication channel structure, and then grouting is performed inside the wall by drilling holes in the seam to compensate for the waterproof function of the elastic rubber sealing pad. The specific steps include the following:

[0074] 1) Back-wall grouting: Determine the overall thickness of the steel pipe segment according to the design drawings, and use double-liquid slurry or oil-soluble polyurethane slurry to perform back-wall grouting on the surrounding concrete pipe segments. The back-wall grouting pressure shall not exceed 0.3MPa. When the back-wall grouting pressure exceeds 0.3MPa, stop grouting. The back-wall grouting amount of each concrete pipe segment shall not exceed 100kg;

[0075] 2) For the water leakage at the joints of the steel pipe segments, bury the pinhole grouting pipe to the elastic rubber sealing pad, with a drilling depth of 27 cm and a hole spacing of 30 cm;

[0076] 3) Use an electric grouting pump for joint chemical grouting: According to the number of buried grouting pipes at the steel pipe segment assembly joints, select oil-soluble polyurethane slurry, and grout in sequence in a bottom-up manner to fill the failed elastic rubber sealing pads or water retaining strips in the steel pipe segment assembly joints to restore the original sealing effect. Among them, the grouting pressure is not greater than 0.5MPa, so that the slurry can be slowly and fully filled into the steel pipe segment assembly joints. When the grouting pressure is greater than 0.5MPa or the surrounding steel pipe segment assembly joints have been leaking slurry for 3 minutes, stop grouting;

[0077] 4) Use epoxy putty to seal the joints of the steel pipe segments near the grouting nozzle;

[0078] 5) Grind and remove rust from the inner curved steel ribs of the steel pipe segment as a whole until there is no visible grease and dirt on the surface, and no loosely attached rust, oxide scale or paint coating, etc.;

[0079] 6) After rust removal, apply polymer rust passivator three times to improve the durability of the tunnel steel pipe segment.

[0080] The hydrophilic rigid epoxy slurry in the present invention is a high-performance, high-solid content epoxy resin matrix, which can react with water to form a tough solidified material after encountering water, and has a waterproof effect, and is suitable for situations where the leakage surface is small; the oil-soluble polyurethane slurry is a waterproof material with polyurethane resin as the main component, which can produce a chemical reaction after encountering water to generate a water-insoluble foam, which has a waterproof and leak-proof effect, and has fast foaming, and is suitable for situations where the leakage surface is large; the double liquid slurry is a waterproof material composed of two different components, including polyurethane resin and acrylate, etc., which can undergo a cross-linking reaction after encountering water to form a tough waterproof layer, and has a waterproof effect. The double liquid slurry can adjust and control the foaming rate by changing the components. These three slurries can be selected according to actual conditions.

[0081] The present invention selects a communication channel of a certain rail transit line as the object of rectification to verify the water leakage treatment method: in the preliminary workload survey, it was found that there were multiple water leakage problems in the steel pipe segments of the communication channel, including 3 water leakages at the joints between the steel pipe segments and the communication channel structure, 8 water leakages at the steel pipe segment cavity, and 2 water leakages at the steel pipe segment assembly joints. By preferentially performing back-wall grouting at the adjacent concrete segments, three rings of concrete segments adjacent blocks and standard blocks are opened on the left and right sides of the steel segments, and 100 kilograms of slurry is injected into each hole. Then, chemical grouting treatment and structural crack reinforcement are carried out at each water leakage location. At the same time, after the treatment is completed, the welded steel plate on the surface of the steel pipe segment cavity is sealed. Finally, the rusted parts of the steel pipe segments are derusted and painted with anti-corrosion paint. After the above construction, the original problem of water leakage in the steel pipe segments has been effectively controlled. The original 13 water leaks have been effectively dealt with. After the use of this method for remediation, there is no water leakage. Through the quality follow-up visits every six months, no recurrence of leakage was found. The water leakage problem of the steel pipe segments has been fundamentally solved.

[0082] The present invention has the following beneficial effects:

[0083] 1) The present invention can effectively solve the problem of water leakage of shield tunnel steel pipe segments, and specifically proposes treatment methods for water leakage at the joints between tunnel steel pipe segments and connecting channel structures, water leakage in the tunnel steel pipe segment cavity, and water leakage at the joints of tunnel steel pipe segments, thereby protecting the integrity of the tunnel structure and improving the durability of the tunnel steel pipe segments.

[0084] 2) The present invention can maintain the stability and safety of the tunnel structure, reduce the risk of accidents and structural failures, extend the service life of the tunnel, and ensure the continuous and reliable operation of the transportation system.

[0085] 3) The present invention can effectively reduce the number of times the water leakage problem recurs after being treated, thereby reducing the cost of multiple repairs and restorations in the future.

[0086] The above-described embodiments are only further explanations of the present invention, and are not intended to limit the present invention in other forms. The present invention may also have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding modifications and changes according to the present invention, but these corresponding modifications and changes should all fall within the protection scope of the present invention.

Claims

1. A method for treating water leakage in steel pipe segments of a shield tunnel. It is characterized in that The steps include: Step S1, grouting the outer wall of the steel pipe segment to construct a waterproof barrier layer, wherein the grouting material used includes double liquid slurry or oil-soluble polyurethane slurry; Step S2, grouting at the water leakage position of the steel pipe segment, the grouting material used includes hydrophilic rigid epoxy slurry or oil-soluble polyurethane slurry; Step S3, sealing the surface of the steel pipe segment; Step S4: performing anti-corrosion treatment on the inner wall surface of the steel pipe segment.

2. The method for treating water leakage in a shield tunnel steel pipe segment according to claim 1, It is characterized in that The step S1 also includes determining the overall thickness of the steel pipe segment according to the design drawing.

3. The method for treating water leakage of steel pipe segments in a shield tunnel according to claim 1, It is characterized in that Both step S1 and step S2 further include setting the grouting pressure, and judging whether the grouting is terminated according to the grouting pressure.

4. The method for treating water leakage in a shield tunnel steel segment according to claim 3, It is characterized in that In the step S1, the grouting pressure of the grouting behind the outer wall of the steel pipe segment is not greater than 0.3 MPa, and the grouting is stopped when the grouting pressure is greater than 0.3 MPa.

5. The method for treating water leakage in a shield tunnel steel segment according to claim 3, It is characterized in that When the location of water leakage in the tunnel steel pipe segment is the joint between the steel pipe segment and the connecting channel structure, the step S2 specifically includes: using hydrophilic rigid epoxy slurry for drilling grouting, the grouting pressure is not greater than 0.4MPa, and the grouting is stopped when the grouting pressure is greater than 0.4MPa or the surrounding structure has been leaking slurry for 3 minutes.

6. The method for treating water leakage in a shield tunnel steel segment according to claim 3, It is characterized in that When the location of water leakage in the tunnel steel pipe segment is the steel pipe segment cavity, the step S2 specifically includes: using hydrophilic rigid epoxy slurry for drilling grouting, the grouting pressure is not greater than 0.2MPa, and the grouting is stopped when the grouting pressure is greater than 0.2MPa or the surrounding structure has been leaking slurry for 3 minutes.

7. The method for treating water leakage in a shield tunnel steel segment according to claim 3, It is characterized in that When the location of water leakage in the tunnel steel pipe segment is the joint of the steel pipe segment, the step S2 specifically includes: using oil-soluble polyurethane slurry to perform seam drilling grouting, the grouting pressure is not greater than 0.5MPa, and the grouting is stopped when the grouting pressure is greater than 0.5MPa or the slurry seeps out of the assembly joints of the surrounding steel pipe segments for 3 minutes.

8. The method for treating water leakage in a shield tunnel steel segment according to claim 1, It is characterized in that The step S3 specifically includes: using epoxy putty to seal the joints and / or annular seams of the steel pipe segments after grouting.

9. The method for treating water leakage in a shield tunnel steel segment according to claim 1, It is characterized in that The step S4 specifically includes: applying three coats of polymer rust layer passivating agent on the inner wall surface of the steel pipe segment for anti-corrosion treatment.

10. The method for treating water leakage in a shield tunnel steel segment according to claim 9, It is characterized in that The step S4 also includes grinding and removing rust from the inner wall surface of the steel pipe segment before the anti-corrosion treatment.

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