A method for repairing and reinforcing deformed subway tunnels

Abstract

This application provides a method for repairing and reinforcing deformed subway tunnels, comprising: fabricating new steel pipe segments; towing a subway tunnel reinforcement vehicle to the reinforcement area of ​​the subway tunnel using a railcar, and temporarily dismantling the support equipment within the reinforcement area; performing seepage prevention and sealing treatment on the circumferential and longitudinal joints of the old pipe segments within the reinforcement area; sequentially installing multiple new steel pipe segments on the surface of the damaged old pipe segments within the reinforcement area; welding the multiple new steel pipe segments into a ring; performing anti-corrosion treatment on the new steel pipe segments; injecting epoxy resin between the new steel pipe segments and the old pipe segments; and removing the subway tunnel reinforcement vehicle and returning it to the maintenance base. This method reinforces the damaged old pipe segments inside the tunnel with new steel pipe segments, using the ring-shaped new steel pipe segments as a permanent reinforcement structure for the tunnel, and injecting epoxy resin into the circumferential and longitudinal joints of the old tunnel segments, thereby forming multiple waterproof lines of defense to ensure effective sealing of leaks, thus achieving the effect of reinforcing and preventing leakage in the subway tunnel.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building construction, in particular to a subway operation tunnel deformation repair and reinforcement method. BACKGROUND

[0002] As a key link of urban underground space construction, the urban rail transit system has made great progress, and the total operating mileage of the urban rail transit system in China has shown explosive growth.

[0003] The shield tunnel segment is often affected by various adverse factors such as complex underground stress, chemical substance erosion, and underground water spread in the complex and poor underground environment, resulting in cracks, material degradation, water leakage and other phenomena in the tunnel structure, causing serious social and economic losses. The segment of the shield tunnel is an important component to ensure the safe operation of the tunnel structure system. Once cracking occurs, it will cause safety hazards to the normal use of the tunnel, and the treatment of tunnel cracking also has a series of problems such as great construction difficulty, high safety risk, and great economic loss.

[0004] In recent years, with the increase of the operation life of urban subway shield tunnels, the tunnel diseases found in daily detection have also gradually increased, which can be divided into two categories: local damage and overall large deformation of the tunnel structure. Among them, local damage includes water leakage, cracks, and missing corners, and overall large deformation of the tunnel structure includes joint opening, segment misalignment, and segment deformation. At the same time, the local damage of the structure will affect the normal operation of the shield tunnel, and if it continues to develop, it may affect the normal traffic safety, and the large deformation of the tunnel structure will pose a great threat to the safe bearing of the shield tunnel structure.

[0005] For the overall large deformation problem in the tunnel structure, the actual reinforcement methods in the project at present mainly include the following methods: adopting the inner tension steel ring reinforcement method to reinforce the segment structure in the later stage to control the subsequent deformation of the structure. However, the existing steel segment installation equipment has relatively single function and low automation rate. When the steel segment is installed, the cable, pipeline, support and other auxiliary equipment need to be removed, and the steel segment installation equipment has low efficiency and high labor intensity when entering and exiting the tunnel. SUMMARY

[0006] The present application provides a subway operation tunnel deformation repair and reinforcement method, which aims to solve the problems of low construction efficiency and poor reinforcement effect of the existing subway tunnel.

[0007] The technical scheme of the present application is:

[0008] A subway operation tunnel deformation repair and reinforcement method, comprising the following steps:

[0009] S1, new steel segment manufacturing;

[0010] S2, reinforcing the metro tunnel reinforcement vehicle to the reinforcement area of the metro operation tunnel by rail car traction, temporarily removing the support equipment in the reinforcement area;

[0011] S3, carrying out the anti-seepage treatment on the ring joint and longitudinal joint of the old pipe piece in the reinforcement area;

[0012] S4, sequentially installing a plurality of new steel pipe pieces on the surface of the damaged old pipe piece in the reinforcement area;

[0013] S5, ring welding a plurality of new steel pipe pieces;

[0014] S6, carrying out the anti-corrosion treatment on the new steel pipe piece;

[0015] S7, pressing the epoxy resin between the new steel pipe piece and the old pipe piece;

[0016] S8, withdrawing the metro tunnel reinforcement vehicle to the inspection base.

[0017] As a technical solution of the present application, in step S1, the manufacturing of the new steel pipe piece includes: numerically controlling the blanking of each ring of the new steel pipe piece according to the design drawing, bending the blanked new steel pipe piece through a steel plate bending machine according to the drawing requirements, and performing size rechecking and adjustment; coating the formed new steel pipe piece; and sequentially marking each processed new steel pipe piece.

[0018] As a technical solution of the present application, in step S2, the new steel pipe piece to be installed and the inspection tool are loaded on the metro tunnel reinforcement vehicle; the metro tunnel reinforcement vehicle is connected with the rail car and connected with the air pipe; after confirming that the operation tunnel has been powered off, the metro tunnel reinforcement vehicle is pulled to the reinforcement area by the rail car, and position docking is performed; the cable connector of the metro tunnel reinforcement vehicle is connected to the tunnel junction box; the locking pin of the metro tunnel reinforcement vehicle is pulled out, the hydraulic support leg of the metro tunnel reinforcement vehicle is rotated by 90°, the pump station of the metro tunnel reinforcement vehicle is started, the hydraulic support leg is extended, and the hydraulic support leg is supported on the inclined surface of the old pipe piece; and the support equipment in the reinforcement area is temporarily removed.

[0019] As a technical solution of the present application, in step S3, the ring joint and longitudinal joint on the old pipe piece are polished, and epoxy resin primer is brushed; the nodes of the old pipe piece are drilled at intervals, and epoxy mortar is extruded into the drill holes, the nodes of the old pipe piece are sealed by inserting a plastic rod into the drill holes to extrude the mortar; grouting nozzles are embedded on the ring joint and longitudinal joint of the old pipe piece, and grouting is carried out from bottom to top through the grouting nozzles, so that the grout fills the joints on the entire old pipe piece.

[0020] As a technical solution of the present application, in step S4, a first new steel pipe piece is symmetrically installed below the opposite sides of the tunnel: one end of the first new steel pipe piece is lifted by a fixed column rotating crane to make the first new steel pipe piece in a vertical state, the first new steel pipe piece is sent to an installation position by the fixed column rotating crane, the side surface of the first new steel pipe piece is fixedly attached to the corresponding side surface on the sleeper plate, and the arc surface of the first new steel pipe piece is fixedly attached to the corresponding arc surface of the old pipe piece; a second new steel pipe piece is symmetrically installed in the middle of the two sides of the tunnel: the second new steel pipe piece is lifted by the fixed column rotating crane, the second new steel pipe piece is clamped by a mechanical arm and transported to the top of the tunnel, the second new steel pipe piece is attached to the inner wall of the tunnel and passes through the pipeline of the tunnel side wall from top to bottom, the two second new steel pipe pieces are sent to the installation position, the posture of the second new steel pipe piece is adjusted to make the second new steel pipe piece aligned with the corresponding first new steel pipe piece, and the two second new steel pipe pieces are fixed to the corresponding installation positions by a plurality of expansion bolts; a third new steel pipe piece is installed at the top of the tunnel: the third new steel pipe piece is lifted by the fixed column rotating crane, the third new steel pipe piece is clamped by the mechanical arm to the top side of the tunnel, the third new steel pipe piece is attached to the inner wall of the tunnel and inserted from the tunnel line direction, the third new steel pipe piece is sent to the installation position, the posture of the third new steel pipe piece is adjusted to make the third new steel pipe piece attached to the second new steel pipe pieces installed on both sides, and the third new steel pipe piece is fixed to the installation position by a plurality of expansion bolts.

[0021] As a technical solution of the present application, in step S5, after all the new steel pipe pieces are installed, the seams on each new steel pipe piece are welded to make the first new steel pipe piece, the second new steel pipe piece and the third new steel pipe piece form a circular ring structure, and all the welds are bevel welds, the bevels are opened during the processing of all the new steel pipe pieces, and the bevels are not coated, and then a CO2 gas shielded welding method is used for welding; during the welding process, the seams between the first new steel pipe piece and the second new steel pipe piece in the middle are welded first, and then the seams between the second new steel pipe piece and the third new steel pipe piece at the top are welded.

[0022] As a technical solution of the present application, in step S6, the new steel pipe pieces are coated before installation, the coating thickness is uniform, and two primers, one intermediate paint and two topcoats are used for coating in the order and process, and the total thickness is greater than or equal to 200um; after welding, the welds of each new steel pipe piece are polished and coated.

[0023] The beneficial effects of the present application are:

[0024] The subway operation tunnel deformation repairing and reinforcing method provided by the application improves construction efficiency and reduces labor intensity; meanwhile, the annular structure composed of five new steel pipe segments is used to reinforce and support the tunnel with edge shape, the annular structure is attached to the inner surface of the original concrete pipe segment, and the five new steel pipe segments are welded into an integral ring to bear the load caused by the deformation of the original pipe segment, thereby effectively playing a role in reinforcing the tunnel. In addition, the epoxy resin is poured into the ring joint and the longitudinal joint on the old pipe segment of the tunnel, which can effectively form multiple waterproof lines to ensure good leakage sealing, so as to achieve the effect of reinforcing the subway operation tunnel and preventing leakage, thereby further reinforcing the tunnel and prolonging its service life. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0026] Figure 1 The subway operation tunnel deformation repairing and reinforcing method flowchart provided by the embodiments of the application. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the application more clear, the following will combine the drawings in the embodiments of the application to clearly and completely describe the technical solutions in the embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application, not all. The components of the embodiments of the application described and shown in the drawings can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the application.

[0029] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0030] In the description of this application, it should be noted that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. They are only used to facilitate the description of this application and to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] Furthermore, in this application, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Moreover, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] Example:

[0035] Please refer to Figure 1 This application provides a method for repairing and reinforcing deformation in subway operating tunnels, including the following steps:

[0036] S1, New steel pipe segment fabrication;

[0037] S2, using a railcar to pull a subway tunnel reinforcement vehicle to the reinforcement area of ​​the subway operating tunnel, temporarily dismantling and relocating the evacuation platform and support equipment within the reinforcement area;

[0038] S3, perform seepage prevention and sealing treatment on the circumferential and longitudinal joints of the old pipe segments in the reinforced area;

[0039] S4, sequentially installing a plurality of new steel pipe segments on the surface of the damaged old pipe segment in the reinforcement area;

[0040] S5, ring welding the plurality of new steel pipe segments;

[0041] S6, performing anticorrosion treatment on the new steel pipe segments;

[0042] S7, injecting epoxy resin between the new steel pipe segments and the old pipe segment;

[0043] S8, withdrawing the subway tunnel reinforcement vehicle to the maintenance base.

[0044] Further, in step S1, the manufacturing of the new steel pipe segments includes the following steps: numerically controlling the blanking of each ring of new steel pipe segments according to the design drawings and ensuring the outer dimensions; bending the blanked new steel pipe segments through a steel plate bending machine according to the drawing requirements and performing size rechecking and adjustment; coating the formed new steel pipe segments, and the edge welding of the new steel pipe segments is temporarily not coated; sequentially marking each processed new steel pipe segment.

[0045] Meanwhile, in step S2, the new steel pipe segments to be installed, maintenance tools and other materials are loaded on the subway tunnel reinforcement vehicle and firmly tied; the subway tunnel reinforcement vehicle is connected to the rail car and the air pipe is connected; after confirming that the operating tunnel has been powered off, the subway tunnel reinforcement vehicle is pulled to the reinforcement area by the rail car and is positionally docked; the cable connector of the subway tunnel reinforcement vehicle is connected to the tunnel junction box; the locking pin of the subway tunnel reinforcement vehicle is pulled out, the hydraulic legs of the subway tunnel reinforcement vehicle are rotated by 90°, the pump station of the subway tunnel reinforcement vehicle is started, the hydraulic legs are extended, and the hydraulic legs are supported on the inclined surface of the old pipe segment; the evacuation platform and support equipment in the reinforcement area are temporarily removed and moved to the nearby, and other equipment affecting construction are temporarily removed or arranged.

[0046] And, in step S3, the ring joints and longitudinal joints on the old pipe segment are polished and epoxy primer is brushed; the nodes of the old pipe segment are drilled at intervals, and epoxy mortar is extruded into the drilled holes, and the nodes of the old pipe segment are sealed by inserting plastic rods into the drilled holes to extrude the mortar; grouting nozzles are embedded on the ring joints and longitudinal joints of the old pipe segment for grouting and air outlet during grouting; grouting is performed from bottom to top through the grouting nozzles, so that the grout fills the joints on the entire old pipe segment; after the grouting is completed, the adhesive tape and the grouting nozzles are removed, and the sealing construction is performed.

[0047] Further, in step S4, first new steel pipe pieces are symmetrically installed below the opposite sides of the tunnel: one end of the first new steel pipe piece is hoisted by the fixed column rotating crane to make the first new steel pipe piece in a vertical state, the first new steel pipe piece is sent to the installation position by the fixed column rotating crane, the side surface of the first new steel pipe piece is fixedly attached to the corresponding side surface on the sleeper plate, and the arc surface of the first new steel pipe piece is fixedly attached to the arc surface of the corresponding old pipe piece. Then, second new steel pipe pieces are symmetrically installed in the middle of the two sides of the tunnel: the second new steel pipe piece is hoisted by the fixed column rotating crane, the second new steel pipe piece is clamped by the mechanical arm and transported to the top of the tunnel, the second new steel pipe piece is attached to the inner wall of the tunnel and passes through the pipeline of the tunnel side wall from top to bottom, the two second new steel pipe pieces are sent to the installation position, the attitude of the second new steel pipe piece is adjusted to make the second new steel pipe piece aligned with the corresponding first new steel pipe piece, holes are drilled in the second new steel pipe piece in advance, the holes are two rows and are spaced along the arc length direction of the second new steel pipe piece, the distance between adjacent holes is 500 mm, expansion bolts are driven into the holes, the expansion bolts are driven in the order of first middle and then four corners and are driven into the holes alternately, the driving depth of the expansion bolts is 100 mm, measures are taken to prevent the second new steel pipe piece from being displaced when the expansion bolts are driven, and thus the two second new steel pipe pieces are fixed to the corresponding installation positions by the expansion bolts.

[0048] Further, in step S5, after all the new steel pipe segments are installed, the seams on each new steel pipe segment are welded to form a circular structure of the first new steel pipe segment, the second new steel pipe segment and the third new steel pipe segment, which plays a role of reinforcing and supporting the tunnel, and all the welds are bevel welds, the bevels are opened when all the new steel pipe segments are processed, and the bevels are not coated, then the CO2 gas shielded welding is used for welding, the material of the new steel pipe segment is Q355, the welding wire is solid core welding wire ER50-6, and the specification is φ=1.2; in the welding process, the seam between the first new steel pipe segment and the second new steel pipe segment in the middle is welded first, and then the seam between the second new steel pipe segment and the third new steel pipe segment at the top is welded, and each weld is formed at one time to ensure that the welding is defect-free and the weld surface is smooth. In addition, the multi-pass welding is used for welding, the base welding current is 130-160 A, the voltage is 18-20 V, the welding speed is controlled at 180-200 mm / min, and the second to fourth welding currents are 200-220 A, the voltage is 20-26 V, and the welding speed is controlled at 180-220 mm / min to ensure the welding quality and reduce the welding deformation.

[0049] It should be noted that in step S6, the new steel pipe segment is coated before installation (5 cm of weld position is reserved on both sides of the seam), the coating thickness is uniform, and the coating is performed in the order and process of two base paints, one intermediate paint and two topcoats, and the total thickness is greater than or equal to 200 um; after the welding is completed, the welds of each new steel pipe segment are polished to remove splashes and make the surface smooth, and then the welds are coated after polishing, which is coated by rolling or brushing to make the coating uniform and reduce air pollution as much as possible.

[0050] Meanwhile, in step S7, after all the new steel pipe segments are installed, the epoxy resin pressure injection filling work between the new steel pipe segments and the old pipe segments is performed, the seams between the new steel pipe segments and the old pipe segments on both sides are sealed with epoxy mortar after the annular new steel pipe segment is coated, and then the epoxy mortar is divided into multiple times of pressure injection by using the electric grouting pump for sufficient filling, the pressure injection is sequentially layered from bottom to top, and the pressure injection is stopped after the resin overflows from the top reserved hole.

[0051] Further, in step S8, the temporarily removed evacuation platform is reset and installed; the tools for inspection and repair are collected, the site is cleaned, and it is ensured that all the tools and materials for inspection and repair are collected, and cannot be left on site. The hydraulic outriggers on the subway tunnel reinforcing vehicle are retracted, the locking pins are inserted, the fixed column slewing crane and the installation mechanical arm are operated to the transportation position, the subway tunnel reinforcing vehicle is turned off and powered off, and finally the rail car pulls the subway tunnel reinforcing vehicle away and drives back to the repair base.

[0052] From the above, the application provides a subway operation tunnel deformation repair and reinforcement method, which improves construction efficiency and reduces labor intensity; meanwhile, the annular structure composed of five new steel pipe segments is used to reinforce and strengthen the tunnel with edge shape, the annular structure is attached to the inner surface of the original concrete pipe segment, and the five new steel pipe segments are welded into an integral ring to bear the load caused by the deformation of the original pipe segment, thereby effectively playing a role in reinforcing the tunnel. In addition, the epoxy resin is poured into the ring joint and the longitudinal joint on the old pipe segment of the tunnel, which can effectively form multiple waterproof lines to ensure good leakage sealing, thereby achieving the effects of reinforcing the subway operation tunnel and preventing leakage, so as to further reinforce the tunnel and prolong its service life.

[0053] The above only describes the preferred embodiments of the application and is not intended to limit the application. Those skilled in the art can make various modifications and changes to the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A method for repairing and reinforcing deformation of a subway operation tunnel, characterized by, The method comprises the following steps: S1, new steel pipe piece manufacturing; S2, through the track car traction subway tunnel reinforcement vehicle to the reinforcement area of the subway operation tunnel, temporarily disassembling the support equipment in the reinforcement area; S3, the old pipe piece in the reinforcement area is treated with anti-seepage and leakage; S4, a plurality of new steel pipe pieces are installed on the surface of the damaged old pipe piece in the reinforcement area: the first new steel pipe piece is symmetrically installed below the opposite sides of the tunnel: one end of the first new steel pipe piece is lifted by the fixed column rotary crane to make the first new steel pipe piece vertical, the first new steel pipe piece is sent to the installation position by the fixed column rotary crane, the side surface of the first new steel pipe piece is fixed with the corresponding side surface on the sleeper plate, and the arc surface of the first new steel pipe piece is fixed with the corresponding arc surface of the old pipe piece; the second new steel pipe piece is symmetrically installed in the middle of the tunnel: the second new steel pipe piece is lifted by the fixed column rotary crane, the second new steel pipe piece is clamped by the mechanical arm and transported to the top of the tunnel, the second new steel pipe piece is fitted to the inner wall of the tunnel and passes through the pipeline of the tunnel side wall from top to bottom, the two second new steel pipe pieces are sent to the installation position, the attitude of the second new steel pipe piece is adjusted to make the second new steel pipe piece align with the corresponding first new steel pipe piece, and the two second new steel pipe pieces are fixed in the corresponding installation position by a plurality of expansion bolts; the third new steel pipe piece is installed at the top of the tunnel: the third new steel pipe piece is lifted by the fixed column rotary crane, the third new steel pipe piece is clamped by the mechanical arm to the top side of the tunnel, the third new steel pipe piece is fitted to the inner wall of the tunnel and inserted from the tunnel line direction, the third new steel pipe piece is sent to the installation position, the attitude of the third new steel pipe piece is adjusted to make the third new steel pipe piece fit with the second new steel pipe pieces on both sides, and the third new steel pipe piece is fixed in the installation position by a plurality of expansion bolts; S5, a plurality of new steel pipe pieces are welded: after all the new steel pipe pieces are installed, the joints of each new steel pipe piece are welded to make the first new steel pipe piece, the second new steel pipe piece and the third new steel pipe piece form a circular structure, and all the welds are bevel welds, the bevels are opened during the processing of all the new steel pipe pieces, and then CO2 gas shielded welding is adopted for welding; during welding, the joints between the first new steel pipe piece and the second new steel pipe piece in the middle are welded first, and then the joints between the second new steel pipe piece and the third new steel pipe piece at the top are welded; S6, the new steel pipe piece is treated with anticorrosion; S7, the new steel pipe piece and the old pipe piece are injected with epoxy resin; S8, the subway tunnel reinforcement vehicle is withdrawn and returned to the maintenance base.

2. The method for repairing and reinforcing deformation of a subway operation tunnel according to claim 1, characterized in that, In step S1, the manufacturing of the new steel pipe segment includes: cutting the new steel pipe segment according to the design drawing, bending the new steel pipe segment according to the drawing, and checking and adjusting the size; coating the formed new steel pipe segment; and marking each new steel pipe segment.

3. The method for repairing and reinforcing deformation of a subway operation tunnel according to claim 1, characterized in that, In step S2, the new steel pipe segment to be installed and the maintenance tool are loaded on the subway tunnel reinforcing vehicle. The subway tunnel reinforcing vehicle is connected with the rail car and the air pipe, and after confirming that the operation tunnel has been powered off, the subway tunnel reinforcing vehicle is pulled to the reinforcing area by the rail car, and the position is docked. The cable connector of the subway tunnel reinforcing vehicle is connected to the tunnel junction box. The locking pin of the subway tunnel reinforcing vehicle is pulled out, the hydraulic support leg of the subway tunnel reinforcing vehicle is rotated by 90°, the pump station of the subway tunnel reinforcing vehicle is started, the hydraulic support leg is extended, and the hydraulic support leg is supported on the inclined surface of the old pipe segment; and the support equipment in the reinforcing area is temporarily removed.

4. The method for repairing and reinforcing deformation of a subway operation tunnel according to claim 1, characterized in that, In step S3, the annular joint and the longitudinal joint of the old pipe segment are polished, and epoxy primer is applied; the nodes of the old pipe segment are drilled at intervals, and epoxy mortar is extruded into the drill holes, the nodes of the old pipe segment are sealed by inserting a plastic rod into the drill holes to extrude the mortar; grouting nozzles are embedded on the annular joint and the longitudinal joint of the old pipe segment, and grouting is performed from bottom to top through the grouting nozzles to fill the grout into the joints of the old pipe segment.

5. The method for repairing and reinforcing deformation of a subway operation tunnel according to claim 1, wherein In step S6, the new steel pipe segment is coated before installation, the coating thickness is uniform, two primers, one intermediate paint, and two topcoats are used in sequence and process, and the total thickness is greater than or equal to 200um; and the welds of each new steel pipe segment are polished and coated after welding.

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