Rapid treatment method for the corroded and damaged side walls of an underground passage under a river

Abstract

The present invention discloses a rapid treatment method for the corroded and damaged side wall of an underground passage under a river, belonging to the field of geotechnical engineering repair. When it is found during the use of the underground passage under the river that the side wall is eroded by corrosive multi-ion groundwater, resulting in water leakage or even damage to the side wall, after cutting the corresponding damaged side wall through the integrated side wall repair device, a new wall surface is re-poured to treat the damaged side wall, ensuring the safety and stability performance of the underground passage and extending the service life of the underground passage. The integrated side wall repair device includes a main panel, a hydraulic module, a freezing module, a cutting module and a grouting module. The main construction steps include: arranging drilling points on the side wall, freezing the soil and water body behind the wall using the freezing module; the hydraulic module providing the side wall support force; the cutting module cutting the damaged part of the side wall; after welding the original wall reinforcement separated by the cutting, the grouting module fills the missing side wall to achieve rapid treatment of the damaged side wall.

Description

Technical Field

[0001] The present invention belongs to the field of geotechnical engineering restoration, and particularly relates to a rapid treatment method for the corroded and damaged side walls of an underground passage under a river. Background Technique

[0002] With the rapid construction of cities and the continuous increase in the population in our country, the shortage of urban land resources and the sharp increase in traffic pressure have occurred. And the current era is the golden age for the development and utilization of underground space. Reasonably developing and utilizing urban underground space and constructing it into an efficient underground traffic project is one of the effective methods to solve the urban road traffic problems at present. With the construction and development of underground passages in various cities, the scale of the underground passages is gradually increasing, and the problems emerging in the use and maintenance of the underground passages are gradually increasing.

[0003] The corrosion of concrete and steel bars in the underground structure by underground corrosive multi-ion water is inevitable. Although there are endless waterproof and water isolation means, the isolation of underground corrosive multi-ion water is not foolproof. Moreover, during the hydration or use process of concrete, the formation of cracks is inevitable, which creates opportunities for groundwater to invade the side wall along the cracks and corrode the steel bars and the internal concrete. As time goes by, the steel bars inside the side wall are corroded and the strength decreases, the concrete cracks will expand and penetrate, and the safety and stability of the underground structure are greatly reduced. Therefore, when groundwater leakage is found in the side wall, the leaking side wall structure should be reinforced or repaired in time.

[0004] At present, the repair means for corroded and damaged side walls mainly focus on patching cracks. However, single crack patching cannot effectively prevent groundwater from continuously corroding the concrete and steel bars inside the side wall, which only treats the symptoms but not the root cause. By using the integrated repair and reinforcement technology proposed by the present invention to deal with it, the subsequent safe use of the underground passage can be ensured to a greater extent. Summary of the Invention

[0005] In order to quickly and effectively maintain and repair the corroded and damaged side walls of an underground passage under a river during use, avoid reducing the safety and stability of the underground passage due to the corrosion and damage of the side walls, and ensure the normal operation of the underground passage during the repair process, the present invention proposes a rapid treatment method for the corroded and damaged side walls of an underground passage under a river.

[0006] The object of the present invention is achieved by the following technical solutions: A rapid treatment method for the corroded and damaged side walls of an underground passage under a river, which realizes the rapid repair of the damaged side walls through a side wall repair integrated device;

[0007] The integrated side wall repair device includes a main panel, a support base, a hydraulic module, a freezing module, a cutting module, and a grouting module. Each module is installed on the support base, the support base is installed on the moving track, and fixed feet are installed below the support base; the freezing module includes liquid nitrogen freezing pipes and a liquid nitrogen circulation tank; the cutting module includes a cutting electric saw track and a cutting electric saw; on the outer side of the main panel, a cutting electric saw track, a grouting outlet, a multi-purpose insertion hole, and a steel shovel connection hole are arranged, and on the inner side, a grouting inlet and a liquid nitrogen injection hole are arranged; the method includes the following steps:

[0008] (1) Detect the damage of the side wall and the location of groundwater leakage of the underground passage under the river, and determine the scope of the wall that needs to be cut and rebuilt and the area of soil and water body that needs to be frozen according to the engineering situation;

[0009] (2) After moving the integrated side wall repair device to the designated area in the underground passage, the fixed feet extend out below the support base and are fixed inside the underground passage. The main panel is used as the freezing plane to align with the side wall to be treated. According to the position and length of the liquid nitrogen freezing pipes on the main panel, freezing pipe holes are drilled on the side wall;

[0010] (3) Install liquid nitrogen freezing pipes on the main panel, insert them into the soil and water body behind the wall through the side wall holes, and use the liquid nitrogen circulation tank of the freezing module to carry out liquid nitrogen freezing;

[0011] (4) After the soil and water body behind the wall reaches the completely frozen state, keep the freezing module running to maintain the temperature of the frozen soil and water body area; the cutting electric saw of the cutting module cuts the side wall along the designed cutting route, and at the same time, the hydraulic module provides the supporting force for the side wall to prevent the soil and the side wall from collapsing during the cutting process;

[0012] (5) After the side wall cutting is completed, retract the cutting electric saw on the main panel, replace the liquid nitrogen freezing pipes with high-strength steel bars, connect the high-strength steel shovel to the steel shovel connection hole and insert it into the wall along the cutting seam; the hydraulic module lifts the cut side wall upward and removes it;

[0013] (6) According to the side wall design drawing, chisel the side wall cutting surface to expose the original steel bars, and weld the original steel bars disconnected from the cut side wall with the original grade steel bars; seal other holes and use the main panel to closely adhere to the wall surface as a formwork. The slurry of the grouting module enters from the grouting inlet hole and forms pressure grouting from the grouting outlet to quickly grout and fill the void positions;

[0014] (7) After the grouting reaches the required strength, remove the supporting force of the hydraulic module, remove the integrated side wall repair device, and complete the repair of the underground passage under the river.

[0015] Further, the hydraulic module of the side wall repair integrated device is used to provide a supporting force in the normal direction of the side wall for the side wall, a vertically upward lifting force for the cut side wall, and a driving force for adjusting the angle of the main panel to closely adhere to the side wall.

[0016] Further, in the cutting module, the cutting electric saw installed on the cutting electric saw track can extend or retract according to the usage requirements, and the cutting electric saw track is consistent with the path set during the wall cutting.

[0017] Further, the multi-purpose insertion tube holes on the main panel are used to connect the liquid nitrogen freezing tube during liquid nitrogen freezing and connect the high-strength steel rod during the removal of the wall surface.

[0018] Further, the main panel is a square with a side length of D, and the damaged size of the side wall is regarded as a square with a minimum circumscribed side length of d.

[0019] Further, in step (1), for the working condition where the damaged size of the side wall caused by holes and cracks << the side length D of the main panel, the following design is adopted: taking the centroid of the minimum circumscribed square of the damaged side wall as the reference point, aligning the center of the main panel with the reference point; the main panel is provided with several concentric square cutting electric saw tracks with adjustable side lengths; the side length of the freezing area is set to 2d - 3d, and the side length of the cutting area is set to 1.5d - 2d; the cutting route is preferentially designed to avoid conflicts with the liquid nitrogen freezing tube and the grouting outlet.

[0020] Further, in step (1), for the working condition where the damaged size of the side wall caused by cracks >> the side length D of the main panel, the following design is adopted: dividing the treatment area into 9 sub-areas in 3 rows and 3 columns, and denoting the sub-area in the i-th row and j-th column as the ij area;

[0021] If the crack area falls in the 21, 22, 23 areas, the freezing and cutting routes are carried out step by step according to either the 21→22→23 or 23→22→21 route;

[0022] If the crack area falls in the 11, 22, 33 areas, the freezing route is carried out step by step according to 33→22→11, and the cutting route is carried out step by step according to 11→22→33;

[0023] If the crack area falls in the 12, 22, 32 areas, the freezing route is carried out step by step according to 32→22→12, and the cutting route is carried out step by step according to 12→22→32;

[0024] The freezing area extends 2D - 3D towards both ends of the crack, and the cutting area extends 1.5D - 2D towards both ends of the crack; the cutting route is preferentially designed to avoid conflicts with the liquid nitrogen freezing tube and the grouting outlet.

[0025] Further, in the step (1), for the working condition where the damage size of the side wall caused by holes and cracks is approximately equal to the side length D of the main panel, the following design is adopted: the treatment area is divided into 9 sub-areas with 3 rows and 3 columns, and the sub-area in the i-th row and j-th column is denoted as the ij area;

[0026] If the hole and crack area falls in the 22 area, the side length of the frozen area is set to 3d, that is, it is expanded from the 22 area to the 11, 12, 13, 21, 22, 23, 31, 32, 33 areas, and the side length of the cutting area is set to 2d - 3d; in this case, the side length of the main panel should be expanded from 1D to 3D to facilitate the freezing and cutting operations in actual construction;

[0027] The freezing route is set according to the principle of from bottom to top and from near to far; the cutting route is set according to the principle of from top to bottom and from near to far. The cutting route is carried out simultaneously and symmetrically along two routes of 12→11→21→31→32 and 12→13→23→33→32 to complete the side wall cutting, so as to improve the stability during the cutting process.

[0028] Further, in the step (2), the method for determining the length of the liquid nitrogen freezing pipe is as follows: the soil pressure at the h depth where the side wall to be removed is located is γh, the supporting force provided by the hydraulic module is p, and the soil and water body to be frozen should satisfy that when the pressure is γh - p, the maximum deformation value of the three-point bending numerical simulation does not exceed 3 mm, and thus the length of the liquid nitrogen freezing pipe is determined.

[0029] Further, in the step (3), the radius of the liquid nitrogen freezing pipe is r, the length is L, the number is n, and the liquid nitrogen circulates t times. The liquid nitrogen volume = (α + βt)nπr 2 L, where α = 1.05 - 1.15 is the volume redundancy coefficient, and β = 1.005 - 1.02 is the circulation supplement coefficient.

[0030] The beneficial effects of the present invention are as follows: when it is found during the use of the underground passage under the river that the side wall is eroded by corrosive multi-ion groundwater, resulting in water leakage or even damage to the side wall, first, the damage of the side wall of the underground passage and the location of groundwater leakage are explored, and the range of the side wall that needs to be cut and rebuilt and the area of the soil and water body that needs to be frozen are determined according to the engineering situation. Then, the soil and water body behind the frozen wall is frozen through the side wall repair integrated device, and after cutting the corresponding damaged side wall, a new wall surface is re-poured to process the damaged side wall, ensuring the safety and stability performance of the underground passage and extending the service life of the underground passage. Description of the Drawings

[0031] Figure 1 is a three-dimensional schematic diagram of the side wall repair integrated device provided by the embodiment of the present invention;

[0032] Figure 2 is a plane layout diagram of the main panel provided by the embodiment of the present invention;

[0033] Figure 3 is the top view of the high-strength steel shovel provided by the embodiment of the present invention;

[0034] Figure 4 is the side view of the high-strength steel shovel provided by the embodiment of the present invention. Detailed implementation manners

[0035] For a better understanding of the technical solution of the present application, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0036] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0037] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms of "a", "the" and "said" used in the embodiments of the present application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0038] In order to quickly and effectively maintain and repair the corroded and damaged side walls of the under-river underground passage during use, avoid reducing the safety and stability of the underground passage due to the corrosion and damage of the side walls, and ensure the normal operation of the underground passage during the repair process (such as only occupying 1 / 3 of the lane), the embodiment of the present invention provides a rapid treatment method for the corroded and damaged side walls of the under-river underground passage.

[0039] When it is found during the use of the under-river underground passage that the side wall is eroded by corrosive multi-ion groundwater, resulting in water leakage or even damage to the side wall, after cutting the corresponding damaged side wall through the side wall repair integrated device, a new wall surface is re-poured to treat the damaged side wall, ensuring the safety and stability performance of the underground passage and extending the service life of the underground passage.

[0040] The main material of the side wall repair integrated device designed by the present invention is Q235 steel. As Figure 1 shown, it is composed of a main panel 1, a support base 2, a hydraulic module, a freezing module, a cutting module, a grouting module, etc., to achieve rapid treatment of the damaged side wall.

[0041] Specifically, each module is installed on the support base 2, the support base 2 is installed on the crawler belt, and the entire device is driven to move through the crawler belt. Fixed feet are installed below the support base 2 to provide support for the entire device.

[0042] The hydraulic module is used to provide a supporting force in the normal direction of the side wall for the side wall, a vertically upward lifting force for the cut side wall, and a power to adjust the angle of the main panel to closely adhere to the side wall; the freezing module is used to freeze the soil and water body behind the wall; the electric saw in the cutting module can cut the wall surface and can be extended or retracted according to the use requirements; the grouting module is used to fill the missing side wall. Specifically, the freezing module includes a liquid nitrogen freezing pipe 3 and a liquid nitrogen circulation tank 4; the cutting module includes a cutting electric saw track 5 and a cutting electric saw 6.

[0043] As Figure 2 shown, the main panel 1 is provided with a cutting electric saw track 5 and a variety of holes; the holes include a closable grouting outlet 7 arranged on the outer side, a closable and replaceable multi-purpose insertion hole 8, a steel shovel connection hole 9, and a grouting inlet 10 and a liquid nitrogen injection hole 11 arranged on the inner side; the grouting outlet 7 is used to quickly and evenly grout the wall surface during wall reconstruction; the multi-purpose insertion hole 8 can be used to connect the liquid nitrogen freezing pipe 3 during liquid nitrogen freezing and connect a high-strength steel bar during wall removal; the steel shovel connection hole 9 is used to connect a high-strength steel shovel during wall removal to provide a reaction force for the steel shovel, and the structure of the high-strength steel shovel is as Figure 3 , 4 shown; the cutting electric saw 6 installed on the cutting electric saw track 5 can be freely opened and closed, and the cutting electric saw track 5 is consistent with the path set during wall cutting; in one embodiment, as Figure 2 shown, 16 grouting outlets 7, 9 multi-purpose insertion holes 8, and 6 steel shovel connection holes 9 are adopted.

[0044] The method for quickly treating the corroded and damaged side wall of the underground passage under the river by using the integrated device for side wall repair is as follows:

[0045] (1) Detect the damage of the side wall and the location of groundwater leakage in the underground passage under the river, and determine the scope of the wall to be cut and rebuilt and the area of the soil and water body to be frozen according to the engineering situation.

[0046] (2) After moving the integrated device for side wall repair to the designated area in the underground passage, fixed feet extend from under the support seat of the integrated device for side wall repair and are fixed inside the underground passage. The main panel is used as the freezing plane to align with the side wall to be treated; according to the position and length of the liquid nitrogen freezing pipes on the main panel, freezing pipe holes are drilled on the side wall correspondingly. The length of the liquid nitrogen freezing pipe is the freezing thickness of the soil and water body. The soil pressure at the h depth where the side wall to be cut is located is γh, γ is the unit weight of the soil, the supporting force provided by the hydraulic module is p, and the soil and water body to be frozen should meet that when the pressure is γh - p, the maximum deformation value of the three-point bending numerical simulation does not exceed 3 mm, so as to determine the length of the liquid nitrogen freezing pipe.

[0047] (3) Install a liquid nitrogen freezing tube on the main panel, and insert it into the soil and water body behind the wall through the side wall holes correspondingly, and use the liquid nitrogen circulation tank of the freezing module to carry out liquid nitrogen freezing. The radius of the liquid nitrogen freezing tube is r, the length is L, the number is n, and the liquid nitrogen circulates t times. The liquid nitrogen volume = (α + βt)nπr 2 L, where α = 1.05 - 1.15, which is the volume redundancy coefficient, and β = 1.005 - 1.02, which is the circulation supplement coefficient.

[0048] (4) After the soil and water body behind the wall reaches the fully frozen state, keep the freezing module running to maintain the temperature of the frozen soil and water body area; the cutting electric saw in the cutting module cuts the side wall along the designed cutting route, and at the same time the hydraulic module provides the supporting force for the side wall to prevent the soil and the side wall behind the cutting from collapsing. As a preferred embodiment of the present invention, the cutting speed of the side wall should be controlled at 20 mm / min - 100 mm / min. The frozen soil and water body area > the cutting side wall range, which is beneficial to the stability of the side wall and the soil behind the wall during this process.

[0049] (5) After the side wall cutting is completed, retract the cutting electric saw on the main panel, replace the liquid nitrogen freezing tube connected to the multi-purpose insertion hole with a high-strength steel bar, connect the high-strength steel shovel to the steel shovel connection hole and insert it into the wall along the cutting seam; the lifting device of the hydraulic module lifts the cut side wall upward and removes it.

[0050] (6) According to the side wall design drawing, chisel the side wall cutting surface to expose the original steel bars, and weld the original steel bars cut off on the cut side wall with the corresponding original grade steel bars; seal other holes and use the main panel to closely adhere to the wall surface as a formwork, and the slurry of the grouting module enters from the grouting inlet hole and forms pressure grouting from the grouting outlet to quickly grout and fill the void position.

[0051] (7) After the grouting reaches the required strength, remove the supporting force p of the hydraulic module, remove the side wall repair integrated device, and complete the repair of the underground passage under the river.

[0052] As a preferred embodiment of the present invention, find out the damage of the side wall of the underground passage and the location of groundwater leakage, and determine the range of the side wall that needs to be cut and rebuilt and the area of the soil and water body that needs to be frozen according to the engineering situation. Different designs are adopted for different working conditions, specifically as follows:

[0053] Working condition 1: The size of the side wall damage (holes, cracks) << the side length D of the main panel

[0054] The size of the side wall damage (holes, cracks) is regarded as a square with the smallest circumscribed side length of d, and the centroid is used as the reference point, and the center of the main panel is aligned with the reference point. The main panel is a square with a side length of D, and is provided with a number of concentric square cutting electric saw tracks with adjustable side lengths.

[0055] The side length of the freezing area should be 2d - 3d, and the side length of the cutting area should be 1.5d - 2d; the cutting route should be designed preferentially to avoid conflicts with the liquid nitrogen freezing pipes and grouting outlets.

[0056] Condition 2: The size of the side wall damage (crack) >> the side length D of the main panel

[0057] Generally, in this case, the side wall damage does not appear in the form of holes, but in the form of cracks, and the crack width is significantly smaller than the side length of the main panel. The treatment area is shown in the following table, divided into 3 rows and 3 columns from top to bottom and from left to right, a total of 9 sub-areas.

[0058] 11 12 13 21 22 23 31 32 33

[0059] If the crack area falls in areas 21, 22, 23, the freezing and cutting routes can be carried out step by step according to either the route 21→22→23 or 23→22→21.

[0060] If the crack area falls in areas 11, 22, 33, the freezing route can be carried out step by step according to 33→22→11, and the cutting route can be carried out step by step according to 11→22→33.

[0061] If the crack area falls in areas 12, 22, 32, the freezing route can be carried out step by step according to 32→22→12, and the cutting route can be carried out step by step according to 12→22→32. The freezing area should extend 2D - 3D towards both ends of the crack, and the cutting area should extend 1.5D - 2D towards both ends of the crack; the cutting route should be designed preferentially to avoid conflicts with the liquid nitrogen freezing pipes and grouting outlets.

[0062] Condition 3: The size of the side wall damage (hole) >> the side length D of the main panel. When the length, width and other dimensions of the side wall damage hole are all >> the side length D of the main panel, it is extremely rare and does not meet the repair conditions of the present invention, and is not applied.

[0063] Condition 4: The size of the side wall damage (hole, crack) ≈ the side length D of the main panel

[0064] When the minimum circumscribed side length of the side wall damage (hole, crack) is a square with a side length of d, and the minimum circumscribed square side length d ≈ the side length D of the main panel, the treatment area is shown in the following table, divided into 3 rows and 3 columns from top to bottom and from left to right, a total of 9 sub-areas.

[0065] 11 12 13 21 22 23 31 32 33

[0066] If the hole and crack area falls in area 22, the side length of the freezing area should be 3d, that is, the area is expanded from area 22 to areas 11, 12, 13, 21, 22, 23, 31, 32, 33, and the side length of the cutting area should be 2d - 3d. In this case, the side length of the main panel should be expanded from 1D to 3D to facilitate the freezing and cutting operations in actual construction.

[0067] The freezing route can be carried out according to the principle from bottom to top and from near to far, such as any one of the routes: 31→32→33→23→22→21→11→12→13 or 33→32→31→21→22→23→13→12→11.

[0068] The cutting route is designed according to the actual shape of the crack and can be carried out according to the principle from top to bottom and from near to far. The cutting route is carried out simultaneously and symmetrically along two routes: 12→11→21→31→32 and 12→13→23→33→32 to complete the side wall cutting, so as to improve the stability during the cutting process.

[0069] In the present invention, drilling points are first arranged on the side wall, then the freezing module is used to freeze the soil and water body behind the frozen wall, the hydraulic module is used to provide the supporting force for the side wall, the cutting module is used to cut the damaged part of the side wall, then the original damaged side wall is removed, the original steel bars disconnected after cutting the side wall are welded, and the grouting module fills the missing side wall to achieve the rapid treatment of the damaged side wall.

[0070] The present invention adopts the freezing method for construction. Steel pipes are first drilled and driven into the water-containing soil layer, and circulating liquid nitrogen is introduced to freeze the surrounding strata to form a hard frozen soil shell. It can not only ensure the stability of the strata, but also play a role in water isolation. Its anti-seepage performance is incomparable with any other method. The freezing method construction technology can be adopted for any water-containing, loose and unstable strata with a water content greater than 10%. And the freezing method is an environment-friendly construction method, which has no pollution to the surrounding environment, no foreign objects enter the soil, has low noise, and after the freezing is completed, the frozen soil wall melts without affecting the underground structure around the building.

[0071] The above are only the preferred embodiments of one or more embodiments of this specification, and are not intended to limit one or more embodiments of this specification. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of one or more embodiments of this specification shall be included within the scope of protection of one or more embodiments of this specification.

Claims

1. A rapid treatment method for the corroded and damaged side wall of an underground passage under a river, characterized in that, This method realizes the rapid repair of damaged side walls through an integrated side wall repair device; The integrated side wall repair device includes a main panel, a support base, a hydraulic module, a freezing module, a cutting module, and a grouting module. Each module is installed on the support base, the support base is installed on a moving track, and fixed feet are installed below the support base; the freezing module includes liquid nitrogen freezing pipes and a liquid nitrogen circulation tank; the cutting module includes a cutting electric saw track and a cutting electric saw; on the outer side of the main panel, a cutting electric saw track, a grouting outlet, a multi-purpose insertion hole, and a steel shovel connection hole are arranged, and on the inner side, a grouting inlet and a liquid nitrogen injection hole are arranged; this method includes the following steps: (1) Detect the damage to the side wall of the underground passage under the river and the location of groundwater leakage, and determine the scope of the wall that needs to be cut and rebuilt and the area of soil and water body that needs to be frozen according to the engineering situation; (2) After moving the integrated side wall repair device to the designated area in the underground passage, the fixed feet extend out below the support base and are fixed inside the underground passage. The main panel serves as a freezing plane and aligns with the side wall to be treated. According to the position and length of the liquid nitrogen freezing pipes on the main panel, freeze pipe holes are drilled on the side wall; (3) Install liquid nitrogen freezing pipes on the main panel, insert them into the soil and water body behind the wall through the side wall holes, and use the liquid nitrogen circulation tank of the freezing module to perform liquid nitrogen freezing; (4) After the soil and water body behind the wall reaches a completely frozen state, keep the freezing module running to maintain the temperature of the frozen soil and water body area; the cutting electric saw of the cutting module cuts the side wall along the designed cutting route, and at the same time, the hydraulic module provides a supporting force for the side wall to prevent the soil and the side wall from collapsing during the cutting process; (5) After the side wall cutting is completed, retract the cutting electric saw on the main panel, replace the liquid nitrogen freezing pipes with high-strength steel bars, connect the high-strength steel shovel to the steel shovel connection hole and insert it into the wall along the cutting seam; the hydraulic module lifts the cut side wall upward and removes it; (6) According to the side wall design drawing, chisel the cutting surface of the side wall to expose the original steel bars, weld the original steel bars that are disconnected after cutting the side wall with the original grade of steel bars; seal other holes and use the main panel to closely adhere to the wall surface as a formwork, and the slurry of the grouting module enters from the grouting inlet hole and forms pressure grouting from the grouting outlet to quickly grout and fill the void positions; (7) After the grouting reaches the required strength, remove the supporting force of the hydraulic module, remove the integrated side wall repair device, and complete the repair of the underground passage under the river.

2. A rapid treatment method for the corroded and damaged side walls of an underground passage under a river according to claim 1, characterized in that, The hydraulic module of the integrated side wall repair device is used to provide a supporting force in the normal direction of the side wall for the side wall, a vertically upward lifting force for the cut side wall, and a driving force for adjusting the angle of the main panel to closely adhere to the side wall.

3. A rapid treatment method for the corroded and damaged side wall of an underground passage under a river according to claim 1, characterized in that, In the cutting module, the cutting electric saw installed on the cutting electric saw track can extend or retract according to the use requirements, and the cutting electric saw track is consistent with the path set during the cutting of the wall surface.

4. A rapid treatment method for the corroded and damaged side wall of an underground passage under a river according to claim 1, characterized in that, The multi-purpose insertion hole on the main panel is used to connect the liquid nitrogen freezing pipes during liquid nitrogen freezing and connect the high-strength steel bars when removing the wall surface.

5. A rapid treatment method for the corroded and damaged side wall of an underground passage under a river according to claim 1, characterized in that The main panel is a square with a side length of D, and the damaged size of the side wall is regarded as a square with a minimum circumscribed side length of d.

6. A rapid treatment method for the corroded and damaged side wall of an underground passage under a river according to claim 5, characterized in that In step (1), for the working condition where the damage size of the side wall caused by holes and cracks is << the side length D of the main panel, the following design is adopted: taking the centroid of the smallest circumscribed square of the damaged side wall as the reference point, and aligning the center of the main panel with the reference point; the main panel is provided with a number of concentric square cutting electric saw tracks with adjustable side lengths; the side length of the freezing area is set to 2d to 3d, and the side length of the cutting area is set to 1.5d to 2d; the cutting route is preferentially designed to avoid conflicts with the liquid nitrogen freezing pipes and grouting outlets.

7. A rapid treatment method for the corroded and damaged side wall of an underground passage under a river according to claim 5, characterized in that In step (1), for the working condition where the damage size of the side wall caused by cracks is >> the side length D of the main panel, the following design is adopted: dividing the treatment area into 9 sub-areas in 3 rows and 3 columns, and denoting the sub-area in the i-th row and j-th column as the ij area; If the crack area falls in the 21, 22, 23 areas, the freezing and cutting routes are carried out step by step according to either the route of 21→22→23 or 23→22→21. If the crack area falls in the 11, 22, 33 areas, the freezing route is carried out step by step according to 33→22→11, and the cutting route is carried out step by step according to 11→22→33. If the crack area falls in the 12, 22, 32 areas, the freezing route is carried out step by step according to 32→22→12, and the cutting route is carried out step by step according to 12→22→32. The freezing area extends 2D to 3D towards both ends of the crack, and the cutting area extends 1.5D to 2D towards both ends of the crack; the cutting route is preferentially designed to avoid conflicts with the liquid nitrogen freezing pipes and grouting outlets.

8. A rapid treatment method for the corroded and damaged side walls of an underground passage under a river according to claim 5, characterized in that, In step (1), for the working condition where the damage size of the side wall caused by holes and cracks is ≈ the side length D of the main panel, the following design is adopted: dividing the treatment area into 9 sub-areas in 3 rows and 3 columns, and denoting the sub-area in the i-th row and j-th column as the ij area; If the hole or crack area falls in the 22 area, the side length of the freezing area is set to 3d, that is, it expands from the 22 area to the 11, 12, 13, 21, 22, 23, 31, 32, 33 areas, and the side length of the cutting area is set to 2d to 3d; in this case, the side length of the main panel should be expanded from 1D to 3D to facilitate the freezing and cutting operations in actual construction; The freezing route is set according to the principle of from bottom to top and from near to far; the cutting route is set according to the principle of from top to bottom and from near to far. The cutting route is carried out simultaneously and symmetrically according to the two routes of 12→11→21→31→32 and 12→13→23→33→32 to complete the side wall cutting, so as to improve the stability during the cutting process.

9. A rapid treatment method for the corroded and damaged side walls of an underground passage under a river according to claim 1, characterized in that, In step (2), the method for determining the length of the liquid nitrogen freezing pipe is as follows: the soil pressure at the h depth where the side wall to be removed is located is γh, the supporting force provided by the hydraulic module is p, and the soil and water body to be frozen should satisfy that the maximum deformation value of the three-point bending numerical simulation does not exceed 3 mm under the pressure of γh - p, and thus the length of the liquid nitrogen freezing pipe is determined.

10. A rapid treatment method for the corroded and damaged side wall of an underground passage under a river according to claim 1, characterized in that, In the step (3), the radius of the liquid nitrogen freezing tube is r, the length is L, the number is n, and the liquid nitrogen circulates t times. The liquid nitrogen volume = (α + βt)nπr 2 L, where α = 1.05 - 1.15 is the volume redundancy coefficient, and β = 1.005 - 1.02 is the circulation supplement coefficient.

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