A water stop rubber strip structure applicable to prefabricated integrated pipe corridors and a waterproof detection method

Abstract

The present invention discloses a water stop rubber strip structure and a waterproof detection method suitable for prefabricated integrated pipe galleries, which relates to the technical field of prefabricated pipe galleries. In engineering applications, the integrity and anti-seepage performance of prefabricated pipe segments are damaged by water injection pressure testing through the reserved pipelines of prefabricated pipe segments, resulting in troublesome construction detection and reduced prefabrication construction efficiency. A water stop rubber strip structure suitable for prefabricated integrated pipe galleries provided by the present invention can better perform waterproof test detection without sacrificing the waterproof effect. The water stop rubber strip structure is in a "return" shape structure, including a cross interface A and a cross interface B. Water injection pipes and water outlet pipes are respectively arranged at both ends of the cross interface A and the cross interface B; two water stop rubber strips 1 are symmetrically arranged along the inner circle of the "return" shape structure, and the ends of the two water stop rubber strips 1 are connected through the cross interface to form an inner loop; the water stop rubber strip 2 is a closed outer loop and is arranged on the outer circle of the "return" shape structure.

Description

Technical Field

[0001] The present invention relates to the technical field of prefabricated utility tunnels, and particularly to a water stop rubber strip structure and a waterproof detection method suitable for prefabricated integrated utility tunnels. Background Art

[0002] With the acceleration of the urbanization process, the underground integrated utility tunnel, as an important part of urban infrastructure, has become increasingly prominent. The prefabricated integrated utility tunnel has gradually become the mainstream direction of urban utility tunnel construction due to its advantages such as fast construction speed, small environmental impact, and easy quality control. This kind of utility tunnel is assembled on site through precast components, which not only improves the construction efficiency but also reduces the on-site wet operations, facilitating green construction and sustainable development.

[0003] In the prefabricated integrated utility tunnel, the water stop rubber strip, as a key waterproof component, plays a crucial role in ensuring the waterproof performance of the utility tunnel. Through its good elasticity and sealing performance, the water stop rubber strip forms an effective waterproof barrier at the joint of the utility tunnel, preventing groundwater or other liquids from seeping into the interior of the utility tunnel and protecting various pipeline facilities in the utility tunnel from damage.

[0004] However, due to the large number of joints and complex structure of the prefabricated integrated utility tunnel, its waterproof performance is easily affected by various factors. Therefore, it is particularly important to detect the waterproof performance of the water stop rubber strip during the installation process. Waterproof detection can not only timely discover and repair potential leakage problems, ensure the normal operation and service life of the utility tunnel, but also avoid safety accidents and environmental pollution caused by leakage problems.

[0005] Currently, in the actual engineering application process, the waterproof detection method of the water stop rubber strip mainly adopts the pressure test method. The traditional method is to reserve pipelines in the precast segments to connect the cavity formed by the outside and the water stop rubber strip, and conduct water injection pressure detection through the reserved pipelines. This method requires reserving grouting holes in the precast segments, which destroys the integrity and impermeability of the precast segments. Cracks may occur at the positions of the reserved pipelines, resulting in troublesome construction detection, increased prefabrication costs, and reduced prefabrication construction efficiency. Summary of the Invention

[0006] Aiming at the above existing problems, the present invention aims to provide a water stop rubber strip structure and a waterproof detection method suitable for prefabricated integrated utility tunnels, which can provide a prefabricated semi-open water stop rubber strip and can better conduct waterproof test detection on the premise of not losing the waterproof effect during the whole application process.

[0007] The main idea of the technical solution adopted by the present invention: The ends of the two water-stop rubber strips I arranged on the inner ring are connected through two piercing cross interfaces to form an inner loop, which cooperates with the water-stop rubber strip II arranged on the outer ring to form a "hui" character structure. At the same time, the reserved water injection pipes and water outlet pipes are designed at both ends of the cross interface, which can avoid damaging the self-waterproof ability of the precast segment due to the reserved pipeline, can avoid the stress and crack conditions of the precast segment at this place, and can effectively conduct the sealing test of the water-stop rubber strip at the joint of the precast segment.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] A water-stop rubber strip structure applicable to an assembled integrated pipe gallery, the water-stop rubber strip structure is a "hui" character structure, which includes:

[0010] Cross interface A and cross interface B, water injection pipes and water outlet pipes are respectively arranged at both ends of cross interface A and cross interface B;

[0011] Water-stop rubber strip I, two are symmetrically arranged along the inner ring of the "hui" character structure, and the ends of the two water-stop rubber strips I are connected through a cross interface to form an inner loop;

[0012] Water-stop rubber strip II, which is a closed outer loop and is arranged on the outer ring of the "hui" character structure.

[0013] Through the above technical solution, further: Both cross interface A and cross interface B include a circulation pipe, and the water injection pipe and the water outlet pipe are respectively connected to both ends of the circulation pipe.

[0014] 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 orifice of the water outlet pipe is located in the area between the inner loop and the outer loop.

[0015] Through the above technical solution, further: 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-stop rubber strips I, and a reinforcing screw rod is arranged at the end of the extension rod, and a convex thread is arranged on the rod body of the reinforcing screw rod.

[0016] Through the above technical solution, further: A limit disk I is sleeved on the water outlet pipe, the limit disk I is fixedly connected to the water outlet pipe, and the shape of the limit disk I is a reverse snap nut type.

[0017] Through the above technical solution, further: The length of the water outlet pipe is greater than the thickness of the limit disk I and greater than 2 / 3 of the distance between the water-stop rubber strip I and the water-stop rubber strip II.

[0018] 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.

[0019] 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.

[0020] 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:

[0021] 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;

[0022] 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;

[0023] 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;

[0024] 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;

[0025] 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;

[0026] 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.

[0027] The beneficial effects of the present invention are:

[0028] 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.

[0029] Furthermore, by changing the structure of the water-stop rubber strip, it is possible to avoid reserving pipelines in the precast segments of the assembled integrated pipe gallery, and it can prevent the destruction of the self-waterproofing ability of the precast segments due to reserved pipelines.

[0030] Furthermore, by canceling the measure of reserving pipelines in the precast segments of the assembled integrated pipe gallery, it is possible to avoid the occurrence of stress and crack conditions in the precast segments at this location.

[0031] Furthermore, by reducing the reserved pipelines, the precasting difficulty of the precast segments is reduced, and the precasting efficiency of the precast segments is improved.

[0032] The water-stop rubber strip structure applicable to the assembled integrated pipe gallery provided by the present invention can effectively conduct the sealing test of the water-stop rubber strip at the joint of the precast segments. Compared with the traditional method, the construction is more convenient, the structural integrity of the precast segments can be better guaranteed, and the structure of the present invention is clear, the cost is controllable, it is easy to implement, and it can be implemented and applied in precast segments of different structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0034] Figure 2 is a top view schematic diagram of the present invention;

[0035] Figure 3 is Figure 2 a schematic sectional view along A-A;

[0036] Figure 4 is Figure 3 an enlarged schematic diagram of the structure of part A;

[0037] Figure 5 is Figure 3 an enlarged schematic diagram of the structure of part B;

[0038] Figure 6 is a three-dimensional structural schematic diagram of the cross interface of the present invention using a non-threaded reinforced screw rod;

[0039] Figure 7 is a three-dimensional structural schematic diagram of the cross interface of the present invention using a threaded reinforced screw rod;

[0040] Figure 8 is Figure 7 a top view schematic diagram;

[0041] Figure 9 is Figure 8 a schematic sectional view along B-B;

[0042] Figure 10 is a three-dimensional structural schematic diagram of the first limiting disc of the present invention;

[0043] Figure 11 Second side view schematic diagram of the limit disk of the present invention;

[0044] Figure 12 is Figure 11 Schematic diagram of the C-C cross-section;

[0045] Among them:

[0046] 1. First water stop rubber strip;

[0047] 2. Second water stop rubber strip;

[0048] 3. Cross interface; 301. Structural main body; 301-1. Circulation pipe; 301-2. Water injection pipe; 301-3. Water outlet pipe; 301-4. Extension rod; 302. Reinforcing spiral rod; 303. First limit disk; 304. Second limit disk; 304-1. Accommodating groove. Specific implementation manner

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated herein can be arranged and designed in various different configurations.

[0050] The inventor's research found that in the current actual engineering applications, the waterproof detection method of the water stop rubber strip mainly uses the pressure test method. The traditional method is to reserve a pipeline in the precast segment, connect the outside to the cavity formed by the water stop rubber strip, and perform the water injection pressure test through the reserved pipeline. This method requires reserving a grouting hole in the precast segment, which destroys the integrity and impermeability of the precast segment. Cracks may occur at the position of the reserved pipeline, the construction detection is troublesome, the precast cost increases, and the precast construction efficiency decreases.

[0051] Based on the above findings, the present application proposes a water stop rubber strip structure and a waterproof detection method applicable to assembled integrated pipe galleries. The ends of the two first water stop rubber strips 1 arranged in the inner circle are connected by two piercing cross interfaces 3 to form an inner loop, which cooperates with the second water stop rubber strip 2 arranged in the outer circle to form a "hui" character structure. At the same time, the reserved water injection pipe 301-2 and the water outlet pipe 301-3 are designed at both ends of the cross interface 3, which can avoid damaging the self-waterproof ability of the precast segment due to the reserved pipeline, can avoid the stress and crack conditions of the precast segment at this place, and can effectively perform the sealing test of the water stop rubber strip at the joint of the precast segment.

[0052] Embodiment 1:

[0053] Refer to Figure 1 - Figure 12, this application discloses a water-stop rubber strip structure applicable to prefabricated integrated pipe corridors. The water-stop rubber strip structure is in a "return" shape, including two water-stop rubber strips 1, a water-stop rubber strip 2, and a cross interface 3. Two water-stop rubber strips 1 are symmetrically arranged along the inner circle of the "return" shape structure, and the ends of the two water-stop rubber strips 1 are connected through the cross interface 3 to form an inner loop; the water-stop rubber strip 2 is a closed outer loop and is arranged on the outer circle of the "return" shape structure.

[0054] The materials of the water-stop rubber strip 1 and the water-stop rubber strip 2 can be made of porous composite elastic rubber material, or can be designed and changed according to the actual situation and standards. The relative distance between the water-stop rubber strip 1 and the water-stop rubber strip 2 can be adjusted according to the detailed design drawing and the actual requirements of the construction site. The closed water-stop rubber strip 2 has the same function as the water-stop rubber strip between the conventional segments, and is used to prevent the water outside the pipe corridor from seeping into the pipe corridor interior.

[0055] The cross interface 3 includes a cross-shaped structure body 301. The structure 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 respectively, and the inner cavity diameter of the circulation pipe 301-1 is the same as the inner cavity diameters of the water injection pipe 301-2 and the water outlet pipe 301-3. The outer diameter of the circulation pipe 301-1 is larger than the outer diameters of the water injection pipe 301-2 and the water outlet pipe 301-3.

[0056] The water injection pipe 301-2 of the structure body 301 faces the inner side of the space formed by the surrounding of the water-stop rubber strip 1, that is, the inner side of the inner loop, and faces the interior of the pipe corridor; the water outlet pipe 301-3 faces the outer side of the space formed by the water-stop rubber strip 1, that is, the outer side of the inner loop, and faces the outside of the pipe corridor. The pipe orifice of the water outlet pipe 301-3 is located in the area between the inner loop and the outer loop.

[0057] The structure body 301 further includes extension rods 301-4 arranged on both sides of the circulation pipe 301-1. The two ends of the extension rods 301-4 are fixedly connected with reinforcing spiral rods 302. The rod body of the reinforcing spiral rods 302 is provided with convex threads, which can better laterally penetrate into the water-stop rubber strip 1 and be firmly connected with the water-stop rubber strip 1, and can strengthen the connection with the water-stop rubber strip 1; if the reinforcing spiral rods 302 and the water-stop rubber strip 1 are prefabricated together, the reinforcing spiral rods 302 can be set in a non-threaded form.

[0058] The material of the structure body 301 is the same as that of the water-stop rubber strip 1 and the water-stop rubber strip 2, and can be made of porous composite elastic rubber material.

[0059] A limit disk one 303 in the form of a reverse-thread nut is sleeved on the water outlet pipe 301-3. A cylindrical through hole is arranged in the axial direction of the limit disk one 303, and the diameter of the through hole matches the outer diameter of the water outlet pipe 301-3. When designing, the compression deformation conditions of the rubber material of the water outlet pipe 301-3 need to be fully considered. The deformation should not be too large to ensure the stability of the connection. The limit disk one 303 can be better fixed by water pressure to ensure the stability of the connection during the water injection process.

[0060] The designed height and diameter of the limit disk one 303 need to be checked by force calculation. The designed width and height after the two segment linings are extruded and the sealing rubber strips one 1 and two 2 are fully deformed should be taken. The length of the water outlet pipe 301-3 is greater than the thickness of the limit disk one 303 and greater than 2 / 3 of the distance between the sealing rubber strips one 1 and two 2, which is convenient for better drainage and can prevent the water outlet pipe 301-3 at the upper end from leaking when the water level does not reach the expected height.

[0061] As a preferred example, the thickness of the sealing rubber strips one 1 and two 2 is 100 mm, the distance between the sealing rubber strips one 1 and two 2 is 40 mm, and the thickness of the precast segment lining is 640 mm. The length of the water outlet pipe 301-3 is 30 mm, and the thickness of the limit disk one 303 is 20 mm. The length of the water outlet pipe 301-3 is greater than the thickness of the limit disk one 303 and greater than 2 / 3 of the distance between the sealing rubber strips one 1 and two 2. The data here is only for example, and the dimensions for specific applications need to be checked by calculation.

[0062] A limit disk two 304 in the form of a reverse-thread nut is sleeved on the water injection pipe 301-2. A cylindrical through hole is arranged in the axial direction of the limit disk two 304, and the diameter of the through hole matches the outer diameter of the water injection pipe 301-2. When designing, the compression deformation conditions of the rubber material of the water injection pipe 301-2 need to be fully considered. The deformation should not be too large to ensure the stability of the connection.

[0063] The designed height and diameter of the limit disk two 304 need to be checked by force calculation. The designed width and height after the two segment linings are extruded and the sealing rubber strips one 1 and two 2 are fully deformed should be taken.

[0064] A reverse-thread receiving groove 304-1 is formed in the limit disk two 304, and the receiving groove 304-1 is coaxially arranged with the through hole. The receiving groove 304-1 is used to connect the external water pipe and the water pressure gauge. By setting the reverse-thread receiving groove 304-1, its airtightness can be ensured under the action of water pressure, reducing the measured error of the water pressure gauge.

[0065] The limit disk two 304, the limit disk one 303 and the structural main body 301 are fixedly connected, and connection methods such as hot melting and bonding can be adopted.

[0066] Embodiment Two:

[0067] The present invention provides a waterproof detection method applicable to prefabricated integrated pipe galleries, which is realized through a waterstop strip structure applicable to prefabricated integrated pipe galleries described in Embodiment 1. This waterproof detection method includes the following steps:

[0068] Step 1: Perform prefabrication and installation. Two waterstop strips 1 are symmetrically arranged along the inner circle of the "hui" - shaped structure. The ends of the two waterstop strips 1 are connected through a cross - interface 3 to form an inner loop. The waterstop strip 2 is a closed outer loop and is arranged on the outer circle of the "hui" - shaped structure. Among them, the horizontal reinforcing screw rod 302 and the inner waterstop strip 1 are prefabricated as a whole, and the water injection pipes 301 - 2 of the two cross - interfaces 3 face the inner side of the space formed by the surrounding of the waterstop strip 1, that is, the inner side of the inner loop. The two cross - interfaces 3 are respectively named cross - interface A and cross - interface B, and cross - interface A is located below cross - interface B. During waterproof detection, a water pressure gauge A and an external water pipe are connected in the receiving groove 304 - 1 of cross - interface A, and a water pressure gauge B is connected in the receiving groove 304 - 1 of cross - interface B. The water pressure gauge A, the external water pipe, and the water pressure gauge B all adopt existing structures;

[0069] Install the product obtained in the above step in the reserved groove of one segment according to the "hui" - shaped structure, and perform on - site segment docking installation, so that the waterstop strip 1 and the waterstop strip 2 are installed between the left segment and the right segment, and use a pipe - jacking machine or other machinery to squeeze between the two segments. After squeezing the waterstop strip 1 and the waterstop strip 2 between the two segments to the design standard value according to the specification requirements, stop;

[0070] Step 2: Conduct waterproof inspection. Inject water into the water injection pipe 301 - 2 of cross - interface A through the external water pipe. When water starts to drain from the water injection pipe 301 - 2 of cross - interface B, it proves that the bottom of the cavity between the waterstop strip 1 and the waterstop strip 2 has been filled, and the upper side has been filled to 2 / 3;

[0071] At this time, block the water injection pipe 301 - 2 of cross - interface B, continue to inject water. When the water pressure gauge B shows that the pressure continues to rise, it means that in the cavity between the waterstop strip 1 and the waterstop strip 2, the pressure caused by the internal water and gas has reached a certain value. Then stop injecting water and record the values of the water pressure gauge A and the water pressure gauge B at this time;

[0072] Step 3: After the water injection is completed, observe the value fluctuations of the water pressure gauge A and the water pressure gauge B to judge the tightness and waterproofness between the waterstop strip 1 and the waterstop strip 2;

[0073] Step 4: After the detection is completed, open the block at the water injection pipe 301 - 2 of cross - interface B, connect an air pump, and pressurize cross - interface B through the operation of the air pump to discharge the water through cross - interface A;

[0074] Step 5: After the drainage is completed, remove the water pressure gauge A, the external water pipe, and the water pressure gauge B. Seal the water injection pipe 301-2 and the water outlet pipe 301-3 of the cross joint A and the water injection pipe 301-2 and the water outlet pipe 301-3 of the cross joint B respectively with rubber strips, and fill with two-component high-elastic epoxy sealant.

[0075] Step 6: If the pressure test for waterproofing is unqualified, grouting needs to be carried out through the water injection pipe 301-2 to ensure the sealing and waterproofing effect between the two segments. The grouting sequence is the same as the water injection sequence.

[0076] A water stop rubber strip structure applicable to an assembled integrated pipe gallery according to the present invention can effectively avoid the construction step of reserving pipelines on precast segments. During the installation of precast segments of the assembled integrated pipe gallery, the testing time of the waterproof test can be greatly reduced. At the same time, the integrity and anti-seepage of the precast segments of the precast pipe gallery are ensured. For precast component factories, the difficulty of reserving pipelines is greatly reduced, the construction efficiency during precasting is improved, and the structure of the present invention is clear, the cost is controllable, and it is easy to implement, and can be applied in precast segments with different structures.

[0077] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended 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 loop and is arranged on the outer ring of the "U"-shaped structure; 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; The water injection pipe faces the inner side of the inner circuit, the water outlet pipe faces the outer side of the inner circuit, and the outlet pipe is located in the area between the inner circuit and the outer circuit; Extension rods are arranged on both sides of the circulation pipe, and the two extension rods are respectively inserted into the ends of the two water-stopping rubber strips, and reinforcing spiral rods are arranged at the ends of the extension rods, and the rod body of the reinforcing spiral rod is provided with a convex thread; 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 limiting plate 1 is in the shape of an inverted nut type; The thickness of the first and second water stop rubber strips is 100 mm, the distance between the first and second water stop rubber strips is 40 mm, the thickness of the prefabricated pipe segment is 640 mm, the length of the outlet pipe is 30 mm, and the thickness of the first limit plate is 20 mm; 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.

2. According to claim 1, 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.

3. According to claim 2, 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.

4. 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 claim 3, 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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