Water stop rubber strip structure suitable for assembly type comprehensive pipe gallery and waterproof detection method

Abstract

The invention discloses a water stop rubber strip structure suitable for an assembly type comprehensive pipe gallery and a waterproof detection method, relates to the technical field of assembly type pipe galleries, and aims to solve the problems that in engineering application, water injection water pressure detection is carried out through a reserved pipeline of a prefabricated pipe piece, the integrity and impermeability of the prefabricated pipe piece are damaged, construction detection is troublesome, and the prefabrication construction efficiency is reduced. According to the water stop rubber strip structure suitable for the assembly type comprehensive pipe gallery, on the premise that the waterproof effect is not lost, waterproof test detection can be better carried out. The water stop rubber strip is of a concentric-square-shaped structure and comprises a cross connector A and a cross connector B. A water injection pipe and a water outlet pipe are arranged at the two ends of the cross connector A and the two ends of the cross connector B respectively. The two first water stop rubber strips are symmetrically arranged along the inner ring of the structure shaped like the Chinese character'hui ', and the ends of the two first water stop rubber strips are connected through a cross connector to form an inner loop; the second water stop rubber strip is a closed outer loop and is arranged on the outer ring of the structure shaped like the Chinese character'hui '.

Description

Technical Field

[0001] The present invention relates to the technical field of assembled pipe corridors, and in particular to a water-stopping rubber strip structure and a waterproof detection method suitable for assembled integrated pipe corridors. Background Art

[0002] With the acceleration of urbanization, underground utility corridors, as an important part of urban infrastructure, are becoming increasingly important. Prefabricated utility corridors have gradually become the mainstream direction of urban utility corridor construction due to their advantages such as fast construction speed, small environmental impact, and easy quality control. This type of utility corridor is assembled on site through prefabricated components, which not only improves construction efficiency, but also reduces on-site wet operations, which is conducive to achieving green construction and sustainable development.

[0003] In the prefabricated integrated pipe gallery, the water stop strip, as a key waterproof component, plays a vital role in ensuring the waterproof performance of the pipe gallery. With its good elasticity and sealing properties, the water stop strip forms an effective waterproof barrier at the joints of the pipe gallery, preventing groundwater or other liquids from penetrating into the pipe gallery and protecting various pipeline facilities in the pipe gallery from damage.

[0004] However, due to the large number of joints and complex structure of prefabricated integrated pipe corridors, their waterproof performance is easily affected by many factors. Therefore, it is particularly important to test the waterproof performance of the water-stop strips during the installation process. Waterproof testing can not only detect and repair potential water leakage problems in a timely manner, ensure the normal operation and service life of the pipe corridor, but also avoid safety accidents and environmental pollution caused by water leakage problems.

[0005] At present, in actual engineering applications, the waterproof detection method of water-stop strips is mainly through pressure testing. The traditional method is to reserve a pipe in the prefabricated pipe segment to connect the cavity formed by the water-stop strip with the outside, and perform water injection and water pressure detection through the reserved pipe. This method requires reserving grouting holes in the prefabricated pipe segment, which destroys the integrity and impermeability of the prefabricated pipe segment. Cracks will occur at the location of the reserved pipe, making construction detection difficult, increasing prefabrication costs, and reducing prefabrication construction efficiency. Summary of the invention

[0006] In response to the above-mentioned problems, the present invention aims to provide a waterstop strip structure and a waterproof detection method suitable for an assembled integrated pipeline corridor. By providing a prefabricated semi-open waterstop strip, it is possible to better perform waterproof test detection without losing the waterproof effect during the entire application process.

[0007] The main idea of ​​the technical solution adopted by the present invention is as follows: the ends of the two water-stop rubber strips 1 arranged on the inner circle are connected by two piercing cross joints to form an inner loop, which cooperates with the water-stop rubber strip 2 arranged on the outer circle to form a "U"-shaped structure. At the same time, reserved water injection pipes and water outlet pipes are designed at both ends of the cross joints, which can avoid destroying the self-waterproof ability of the prefabricated pipe segment due to the reserved pipes, avoid the stress and cracks of the prefabricated pipe segment at this point, and effectively carry out the sealing test of the water-stop rubber strips at the connection of the prefabricated pipe segment.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A waterproof rubber strip structure suitable for an assembled integrated pipe gallery, the waterproof rubber strip structure is a "U"-shaped structure, comprising: Cross interface A and cross interface B, both ends of which are provided with water injection pipe and water outlet pipe respectively; Two water-stop rubber strips are symmetrically arranged along the inner circle of the "U"-shaped structure, and the ends of the two water-stop rubber strips are connected through a cross interface to form an inner loop; The second water-stop strip is a closed external circuit and is arranged on the outer ring of the "U"-shaped structure.

[0009] Through the above technical solution, further: the cross interface A and the cross interface B both include a circulation pipe, and the water injection pipe and the water outlet pipe are respectively connected to the two ends of the circulation pipe.

[0010] Through the above technical solution, further: the water injection pipe faces the inner side of the inner loop, the water outlet pipe faces the outer side of the inner loop, and the pipe mouth of the water outlet pipe is located in the area between the inner loop and the outer loop.

[0011] Through the above technical scheme, further: extension rods are provided on both sides of the circulation pipe, the two extension rods are respectively inserted into the ends of the two water-stopping strips, and reinforcing spiral rods are provided at the ends of the extension rods, and the rod body of the reinforcing spiral rod is provided with a convex thread.

[0012] Through the above technical solution, further: a limiting plate 1 is sleeved on the water outlet pipe, the limiting plate 1 is fixedly connected to the water outlet pipe, and the limiting plate 1 is in the shape of an inverted nut type.

[0013] Through the above technical solution, further: the length of the water outlet pipe is greater than the thickness of the limiting plate 1, and greater than 2 / 3 of the distance between the water stop strip 1 and the water stop strip 2.

[0014] Through the above technical solution, further: a second limiting plate is sleeved on the water injection pipe, the second limiting plate is fixedly connected to the water injection pipe, and the shape of the second limiting plate is an inverted nut type.

[0015] Through the above technical solution, further: an inverted receiving groove is opened in the second limiting plate, and the receiving groove is coaxially arranged with the water injection pipe.

[0016] A waterproof detection method for an assembled integrated pipe gallery is implemented by a waterproof rubber strip structure suitable for an assembled integrated pipe gallery as described in any one of the above items, and the waterproof detection method comprises the following steps: S1. Install the water stop strip 1, water stop strip 2, cross joint A and cross joint B between the left pipe segment and the right pipe segment according to the "U" shape structure, wherein the cross joint A is located below the cross joint B. During the waterproof test, the water pressure gauge A and the external water pipe are connected in the receiving groove of the cross joint A, and the water pressure gauge B is connected in the receiving groove of the cross joint B; S2. After the installation is completed, water is injected into the water injection pipe of the cross interface A through an external water pipe. When the water injection pipe of the cross interface B is drained, the water injection pipe of the cross interface B is blocked and water injection is continued. When the pressure gauge B shows that the pressure continues to rise, the water injection is stopped and the values ​​of the water pressure gauge A and the water pressure gauge B are recorded at this time; S3. After the water injection is completed, observe the floating values ​​of the water pressure gauge A and the water pressure gauge B to determine the airtightness between the water stop strip 1 and the water stop strip 2; S4. After the test is completed, the plugging at the cross interface B is opened, and an air pump is connected. The cross interface B is pressurized by the air pump, and the water is discharged through the cross interface A; S5, the water injection pipe and the water outlet pipe of the cross interface A and the water injection pipe and the water outlet pipe of the cross interface B are respectively sealed by rubber strips, and filled with two-component high-elasticity epoxy sealant; S6. If the pressure waterproofing test fails, grouting is required through the water injection pipe, and the grouting sequence is the same as the water injection sequence.

[0017] The beneficial effects of the present invention are: The present invention provides a waterproof rubber strip structure which is different from the traditional one and is convenient for implementing waterproof test detection. Under the premise that the waterproof effect is not lost during the entire application process, the waterproof test detection can be better performed.

[0018] Furthermore, by changing the structure of the water-stop strips, it is possible to avoid reserving pipes in the prefabricated pipe segments of the assembled integrated pipe gallery, and to avoid damaging the inherent waterproofing ability of the prefabricated pipe segments due to the reserved pipes.

[0019] Furthermore, by eliminating the measure of reserving pipes in the prefabricated pipe segments of the assembled integrated pipe corridor, the occurrence of stress and cracks in the prefabricated pipe segments at this point can be avoided.

[0020] Furthermore, by reducing the reserved pipelines, the difficulty of prefabricating the prefabricated pipe segments is reduced and the prefabrication efficiency of the prefabricated pipe segments is improved.

[0021] The present invention provides a waterproof rubber strip structure suitable for an assembled integrated pipe gallery, which can effectively carry out a sealing test of the waterproof rubber strips at the joints of prefabricated pipe segments. Compared with the traditional method, the construction is more convenient and the structural integrity of the prefabricated pipe segments can be better guaranteed. The present invention has a clear structure, controllable costs, and is easy to implement, and can be applied to prefabricated pipe segments of different structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a top view schematic diagram of the present invention; Figure 3 for Figure 2 Schematic diagram along the AA section; Figure 4 for Figure 3 A schematic diagram of the enlarged structure of part A; Figure 5 for Figure 3 A schematic diagram of the enlarged structure of part B; Figure 6 It is a schematic diagram of the three-dimensional structure of the cross interface of the present invention using a non-threaded reinforcing spiral rod; Figure 7 It is a schematic diagram of the three-dimensional structure of the cross interface of the present invention using a threaded reinforcing spiral rod; Figure 8 for Figure 7 Schematic diagram from top view; Fig. 9 for Figure 8 Schematic diagram of the section along BB; Fig.10 It is a schematic diagram of a three-dimensional structure of a limiting plate of the present invention; Fig.11 It is a schematic diagram of two side views of the limiting plate of the present invention; Fig.12 for Fig.11 Schematic diagram of the cross section along CC; in: 1. Waterstop strip 1; 2. Waterstop strip 2; 3. Cross interface; 301. Main structure; 301-1. Circulation pipe; 301-2. Water injection pipe; 301-3. Water outlet pipe; 301-4. Extension rod; 302. Strengthening spiral rod; 303. Limiting plate 1; 304. Limiting plate 2; 304-1. Accommodating groove. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] The inventors have found that in the current actual engineering application process, the waterproof detection method of the water stop strip is mainly through the pressure test method. The traditional method is to reserve a pipe in the prefabricated pipe segment to connect the outside with the cavity formed by the water stop strip, and perform water injection water pressure detection through the reserved pipe. This method requires reserving grouting holes in the prefabricated pipe segment, which destroys the integrity and impermeability of the prefabricated pipe segment. Cracks will occur at the location of the reserved pipe, which makes construction detection troublesome, increases prefabrication costs, and reduces prefabrication construction efficiency.

[0025] Based on the above findings, the present application proposes a waterstop strip structure and a waterproof detection method suitable for an assembled integrated pipe corridor. The ends of the two waterstop strips 1 arranged in the inner circle are connected by two piercing cross joints 3 to form an inner loop, and cooperate with the waterstop strips 2 arranged in the outer circle to form a "U"-shaped structure. At the same time, reserved water injection pipes 301-2 and water outlet pipes 301-3 are designed at both ends of the cross joints 3. This can avoid destroying the waterproof ability of the prefabricated pipe segment due to the reserved pipes, avoid the stress and cracks on the prefabricated pipe segment here, and effectively carry out the sealing test of the waterstop strips at the connection of the prefabricated pipe segment.

[0026] Embodiment 1: See also Figure 1 - Fig.12 The present application discloses a waterproof rubber strip structure suitable for an assembled integrated pipe gallery, which is a "U"-shaped structure, including a waterproof rubber strip 1, a waterproof rubber strip 2, and a cross interface 3. Two waterproof rubber strips 1 are symmetrically arranged along the inner circle of the "U"-shaped structure, and the ends of the two waterproof rubber strips 1 are connected by the cross interface 3 to form an inner loop; the waterproof rubber strip 2 is a closed outer loop and is arranged on the outer circle of the "U"-shaped structure.

[0027] The material of the water stop strip 1 and the water stop strip 2 can be a porous composite elastic rubber material, and the design can also be changed according to the actual situation and standards. The relative distance between the water stop strip 1 and the water stop strip 2 can be adjusted according to the detailed design drawing and the actual needs of the construction site. The closed water stop strip 2 has the same function as the water stop strip between the conventional pipe segments, which is used to prevent water from the outside of the pipe gallery from seeping into the inside of the pipe gallery.

[0028] The cross interface 3 includes a cross-shaped structural body 301, and the structural body 301 includes a circulation pipe 301-1, a water injection pipe 301-2 and a water outlet pipe 301-3 that are integrally connected. The circulation pipe 301-1, the water injection pipe 301-2 and the water outlet pipe 301-3 are tubular structures with cylindrical cavities inside. The circulation pipe 301-1 is provided with a water injection pipe 301-2 and a water outlet pipe 301-3 at both ends, and the internal cavity diameter of the circulation pipe 301-1 is the same as the internal cavity diameter of the water injection pipe 301-2 and the water outlet pipe 301-3, and the external diameter of the circulation pipe 301-1 is larger than the external diameters of the water injection pipe 301-2 and the water outlet pipe 301-3.

[0029] The water injection pipe 301-2 of the structural body 301 faces the inner side of the space formed by the waterproof rubber strip 1, that is, the inner side of the inner loop, and faces the inside of the pipe gallery; the water outlet pipe 301-3 faces the outer side of the space formed by the waterproof rubber strip 1, that is, the outer side of the inner loop, and faces the outside of the pipe gallery. The pipe mouth of the water outlet pipe 301-3 is located in the area between the inner loop and the outer loop.

[0030] The structural body 301 also includes an extension rod 301-4 arranged on both sides of the circulation tube 301-1, and the two ends of the extension rod 301-4 are fixedly connected with a reinforcing spiral rod 302. The rod body of the reinforcing spiral rod 302 is provided with a convex thread, which can better penetrate the water stop strip 1 laterally and be firmly connected to the water stop strip 1, and can strengthen the connection with the water stop strip 1; if the reinforcing spiral rod 302 and the water stop strip 1 are prefabricated together, the reinforcing spiral rod 302 can be set to a threadless form.

[0031] The material of the structural body 301 is the same as that of the waterproof rubber strip 1 and the waterproof rubber strip 2, and can be a porous composite elastic rubber material.

[0032] The outlet pipe 301-3 is provided with a reverse nut-type limit plate 1 303. The limit plate 1 303 is provided with a cylindrical through hole in the axial direction, and the diameter of the through hole matches the outer diameter of the outlet pipe 301-3. The compression deformation condition of the rubber material of the outlet pipe 301-3 needs to be fully considered during the design, and the deformation should not be too large to ensure the stability of the connection. The limit plate 1 303 can be better fixed by water pressure to ensure the stability of the connection during the water injection process.

[0033] The design height and diameter of the limit plate 1 303 need to be verified by force calculation, and the design width and height after the two pipe segments are squeezed and the waterproof rubber strip 1 and the waterproof rubber strip 2 are fully deformed into place should be taken. The length of the outlet pipe 301-3 is greater than the thickness of the limit plate 1 303, and greater than 2 / 3 of the distance between the waterproof rubber strip 1 and the waterproof rubber strip 2, so as to facilitate better drainage and prevent the outlet pipe 301-3 at the upper end from leaking when the water level does not reach the expected height.

[0034] As a preferred example, the thickness of the waterproof strip 1 and the waterproof strip 2 is 100mm, the distance between the waterproof strip 1 and the waterproof strip 2 is 40mm, and the thickness of the prefabricated pipe segment is 640mm. The length of the outlet pipe 301-3 is 30mm, the thickness of the limit plate 1 303 is 20mm, and the length of the outlet pipe 301-3 is greater than the thickness of the limit plate 1 303, and greater than 2 / 3 of the distance between the waterproof strip 1 and the waterproof strip 2. The data here are only for example, and the dimensions of specific applications need to be verified.

[0035] The water injection pipe 301-2 is provided with a reverse nut-type limit plate 2 304. The limit plate 2 304 is provided with a cylindrical through hole in the axial direction, and the diameter of the through hole matches the outer diameter of the water injection pipe 301-2. When designing, the compression deformation condition of the rubber material of the water injection pipe 301-2 needs to be fully considered, and the deformation should not be too large to ensure the stability of the connection.

[0036] The design height and diameter of the limit plate 2 304 need to be verified by force calculation, and the design width and height should be taken after the two pipe segments are squeezed and the water stop strip 1 and the water stop strip 2 are fully deformed into place.

[0037] The second limit plate 304 is provided with an inverted receiving groove 304-1, and the receiving groove 304-1 is coaxially arranged with the through hole. The receiving groove 304-1 is used to connect an external water pipe and a water pressure gauge. By providing the inverted receiving groove 304-1, its airtightness can be ensured under the action of water pressure, and the actual measurement error of the water pressure gauge can be reduced.

[0038] The second limiting plate 304 and the first limiting plate 303 are fixedly connected to the structural body 301, and can be connected by hot melting, bonding or other methods.

[0039] Embodiment 2: The present invention provides a waterproof detection method applicable to an assembled integrated pipe gallery, which is implemented by a waterproof rubber strip structure applicable to an assembled integrated pipe gallery as described in Embodiment 1. The waterproof detection method comprises the following steps: Step 1, prefabrication and installation, two water stop strips 1 are symmetrically arranged along the inner circle of the "U"-shaped structure, and the ends of the two water stop strips 1 are connected by a cross joint 3 to form an inner loop; the water stop strip 2 is a closed external loop and is arranged on the outer circle of the "U"-shaped structure. The transverse reinforcing spiral rod 302 and the inner water stop strip 1 are prefabricated into a whole, and the water injection pipes 301-2 of the two cross joints 3 face the inner side of the space formed by the water stop strip 1, that is, the inner side of the inner loop; the two cross joints 3 are named cross joint A and cross joint B, and cross joint A is located below cross joint B; during waterproof testing, the water pressure gauge A and the external water pipe are connected in the receiving groove 304-1 of the cross joint A, and the water pressure gauge B is connected in the receiving groove 304-1 of the cross joint B. The water pressure gauge A, the external water pipe and the water pressure gauge B all adopt the existing structure; The product obtained in the above steps is installed in the reserved groove of one side of the pipe segment according to the "U"-shaped structure, and the pipe segments are butt-jointed and installed on site, so that the water stop rubber strip 1 and the water stop rubber strip 2 are installed between the left pipe segment and the right pipe segment, and the two pipe segments are squeezed by a machine such as a pipe jacking machine, and the water stop rubber strip 1 and the water stop rubber strip 2 between the two pipe segments are squeezed to the design standard value according to the specification requirements and then stopped; Step 2: Perform a waterproof test by injecting water into the water injection pipe 301-2 of the cross interface A through an external water pipe. When the water injection pipe 301-2 of the cross interface B starts to drain water, it proves that the bottom of the cavity between the water stop strip 1 and the water stop strip 2 has been filled, and the upper side has been filled to 2 / 3; At this time, the water injection pipe 301-2 of the cross interface B is blocked, and water injection is continued. When the pressure on the water pressure gauge B continues to rise, it means that the pressure caused by the water and gas inside the cavity between the water stop strip 1 and the water stop strip 2 has reached a certain value, then stop water injection, and record the values ​​of the water pressure gauge A and the water pressure gauge B at this time; Step 3: After the water injection is completed, observe the fluctuation of the values ​​of the water pressure gauge A and the water pressure gauge B to determine the airtightness and waterproofness between the water stop strip 1 and the water stop strip 2; Step 4: After the detection is completed, the plugging at the water injection pipe 301-2 of the cross interface B is opened, and an air pump is connected to pressurize the cross interface B through the operation of the air pump, and the water is discharged through the cross interface A; Step 5: After the drainage is completed, remove the water pressure gauge A, the external water pipe and the water pressure gauge B, and seal the water injection pipe 301-2 and the water outlet pipe 301-3 of the cross interface A and the water injection pipe 301-2 and the water outlet pipe 301-3 of the cross interface B with rubber strips, and fill them with two-component high-elasticity epoxy sealant; Step 6: If the pressure waterproof test fails, grouting is required through the water injection pipe 301-2 to ensure the sealing and waterproof effect between the two pipe segments. The grouting sequence is the same as the water injection sequence.

[0040] The waterproof rubber strip structure suitable for an assembled comprehensive pipe gallery of the present invention can effectively avoid the construction step of reserving pipes on prefabricated pipe segments. In the process of installing prefabricated pipe segments of the assembled comprehensive pipe gallery, the test time of the waterproof test can be greatly reduced, while ensuring the integrity and anti-seepage of the prefabricated pipe segments of the prefabricated pipe gallery. For prefabricated component factories, the difficulty of reserving pipes is greatly reduced, and the construction efficiency during prefabrication is improved. In addition, the waterproof rubber strip structure of the present invention is clear in structure, controllable in cost, easy to implement, and can be implemented in prefabricated pipe segments of different structures.

[0041] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A waterproof rubber strip structure suitable for an assembled integrated pipe gallery, characterized in that: The structure of the water stop strip is a "U"-shaped structure, which includes: Cross interface A and cross interface B, both ends of which are provided with water injection pipe and water outlet pipe respectively; Two water-stop rubber strips are symmetrically arranged along the inner circle of the "U"-shaped structure, and the ends of the two water-stop rubber strips are connected through a cross interface to form an inner loop; The second water-stop strip is a closed external circuit and is arranged on the outer ring of the "U"-shaped structure.

2. According to claim 1, a waterproof rubber strip structure suitable for an assembled integrated pipe gallery is characterized in that: The cross interface A and the cross interface B both include a circulation pipe, and the water injection pipe and the water outlet pipe are respectively connected to the two ends of the circulation pipe.

3. According to claim 2, a waterproof rubber strip structure suitable for an assembled integrated pipe gallery is characterized in that: The water injection pipe faces the inner side of the inner loop, the water outlet pipe faces the outer side of the inner loop, and the pipe mouth of the water outlet pipe is located in the area between the inner loop and the outer loop.

4. According to claim 3, a waterproof rubber strip structure suitable for an assembled integrated pipe gallery is characterized in that: Extension rods are arranged on both sides of the circulation pipe. The two extension rods are respectively inserted into the ends of the two water-stopping rubber strips. Reinforcement spiral rods are arranged at the ends of the extension rods. The rod body of the reinforcement spiral rod is provided with a convex thread.

5. According to claim 4, a waterproof rubber strip structure suitable for an assembled integrated pipe gallery is characterized in that: A limiting plate 1 is sleeved on the water outlet pipe, and the limiting plate 1 is fixedly connected to the water outlet pipe, and the shape of the limiting plate 1 is an inverted nut type.

6. According to claim 5, a waterproof rubber strip structure suitable for an assembled integrated pipe gallery is characterized in that: The length of the water outlet pipe is greater than the thickness of the limiting plate 1, and greater than 2 / 3 of the distance between the water stop rubber strip 1 and the water stop rubber strip 2.

7. According to claim 6, a waterproof rubber strip structure suitable for an assembled integrated pipe gallery is characterized in that: A second limiting plate is sleeved on the water injection pipe, and the second limiting plate is fixedly connected to the water injection pipe. The shape of the second limiting plate is an inverted nut type.

8. According to claim 7, a waterproof rubber strip structure suitable for an assembled integrated pipe gallery is characterized in that: An inverted receiving groove is provided in the second limiting plate, and the receiving groove is coaxially arranged with the water injection pipe.

9. A waterproof detection method suitable for an assembled integrated pipe gallery, characterized in that: The waterproof detection method is realized by a waterproof rubber strip structure suitable for an assembled integrated pipe gallery as described in any one of claims 1 to 8, and comprises the following steps: S1. Install the water stop strip 1, water stop strip 2, cross joint A and cross joint B between the left and right segments according to the "U" shape structure, wherein the cross joint A is located below the cross joint B. During waterproof testing, connect the water pressure gauge A and the external water pipe in the receiving groove of the cross joint A, and connect the water pressure gauge B in the receiving groove of the cross joint B; S2. After the installation is completed, water is injected into the water injection pipe of the cross interface A through an external water pipe. When the water injection pipe of the cross interface B is drained, the water injection pipe of the cross interface B is blocked and water injection is continued. When the pressure gauge B shows that the pressure continues to rise, the water injection is stopped and the values ​​of the water pressure gauge A and the water pressure gauge B are recorded at this time; S3. After the water injection is completed, observe the floating values ​​of the water pressure gauge A and the water pressure gauge B to determine the airtightness between the water stop strip 1 and the water stop strip 2; S4. After the test is completed, the plugging at the cross interface B is opened, and an air pump is connected. The cross interface B is pressurized by the air pump, and the water is discharged through the cross interface A; S5, the water injection pipe and the water outlet pipe of the cross interface A and the water injection pipe and the water outlet pipe of the cross interface B are respectively sealed by rubber strips, and filled with two-component high-elasticity epoxy sealant; S6. If the pressure waterproofing test fails, grouting is required through the water injection pipe, and the grouting sequence is the same as the water injection sequence.

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