Comprehensive pipe gallery joint stepped multi-stage waterproof structure

Abstract

The utility model relates to a comprehensive pipe gallery joint ladder type multistage waterproof structure relates to pipe gallery waterproof technical field, the comprehensive pipe gallery is formed by the splicing of several pipe gallery sections, and the rear end of the pipe gallery section of front side forms socket structure, and the front end of the pipe gallery section of rear side adjacent is equipped with the spout structure cooperation with socket structure, when socket structure and spout structure butt joint, realize sealing through multistage sealing structure, multistage sealing structure includes waterproof unit in the outer end and inner end of butt joint, and the sealing unit of being equipped with in the inboard of butt joint, and the adjacent pipe gallery section is fixed through the prestressed reinforcement tension, the utility model discloses a comprehensive pipe gallery joint ladder type multistage waterproof structure, through the combination of waterproof structure form optimization, material performance matching and defense line arrangement strategy, realize the multistage excitation and multilevel superposition of waterproof efficiency and the reliable waterproof of joint area.

Description

Technical Field

[0001] This invention relates to the field of waterproofing technology for utility tunnels, specifically to a stepped multi-level waterproofing structure for integrated utility tunnel joints. Background Technology

[0002] Underground utility tunnels, as key infrastructure for the intensive use of urban underground space, play a vital role in coordinating the laying of various municipal pipelines and enhancing the city's overall carrying capacity. To overcome the limitations of traditional open-cut and cast-in-place construction methods, such as long construction cycles, significant environmental impact, and poor quality control, prefabricated utility tunnel structures are gradually becoming an important direction for promoting the industrialization of utility tunnel construction. Prefabricated utility tunnels, by dividing the overall structure into prefabricated segments for assembly, improve construction efficiency and reduce on-site work. However, this also introduces a large number of segment joints, making joint waterproofing a core technical issue affecting the long-term safe operation of the utility tunnel.

[0003] Currently, common waterproofing designs for pipe gallery joints often rely on single or limited waterproofing measures, such as using only sealant, water-swellable rubber strips, or embedded waterstops. While these structures can meet sealing requirements under static or minor deformation conditions, in actual engineering projects, pipe gallery joints are often subjected to complex soil and water environments combined with dynamic loads such as uneven settlement and temperature deformation. This makes them prone to localized waterproofing failure due to stress concentration, material aging, or interface peeling. Once a waterproofing barrier is breached, moisture can easily seep in along the joint, triggering a series of chain reactions such as internal pipeline corrosion and reduced structural durability, making it difficult to achieve reliable graded water blocking and systemic waterproofing effects.

[0004] Therefore, existing technologies lack systematic integration of multi-level waterproofing mechanisms, and lack guidance and multiple designs for waterproofing paths, making it difficult to adapt to the multi-condition and dynamic waterproofing requirements faced by prefabricated pipe gallery joints during long-term service. It is necessary to develop a new waterproofing structure that, through the synergistic design of structural optimization and material combinations, achieves multi-stage and multi-layered waterproofing performance superposition, thereby improving the overall waterproofing reliability and deformation adaptability of the joint area. Utility Model Content

[0005] This invention discloses a stepped multi-level waterproof structure for integrated utility tunnel joints. By combining the optimization of waterproof structure morphology, matching of material performance, and defense line layout strategy, it achieves multi-stage activation and multi-layer superposition of waterproof performance and reliable waterproofing of the joint area.

[0006] To achieve the above objectives, the technical solution of this invention is as follows: A stepped, multi-level waterproof structure for integrated utility tunnel joints is disclosed. The integrated utility tunnel is composed of several tunnel segments spliced ​​together. The rear end of the front tunnel segment forms a socket structure, and the front end of the adjacent rear tunnel segment is provided with a spigot structure that mates with the socket structure. When the socket structure and the spigot structure are joined, a multi-level sealing structure is used to achieve a seal. The multi-level sealing structure includes waterproof units located at the outer and inner ends of the joint and several sealing units located on the inner side of the joint. Adjacent tunnel segments are tightened and fixed together by prestressed steel bars.

[0007] Preferably, the socket structure is provided with a stepped groove, and the spigot structure is provided with a stepped protrusion. When the socket structure and the spigot structure are joined, the cross-sectional orientation at the joint forms a Z-shaped structure. Waterproof units are provided at the outer and inner ends of the Z-shaped structure and around the outer and inner walls of the adjacent pipe gallery segments, respectively. A sealing unit is provided on the inner side of the Z-shaped structure, surrounding the axis of the pipe gallery segment and tightly fitting the stepped groove and the stepped protrusion.

[0008] Preferably, the waterproof unit includes a geotextile buffer layer and a waterproof layer. The geotextile buffer layer is tightly attached to both sides of the outer or inner port of the joint and is fixedly connected to the concrete of the pipe gallery segment by cement nails and gaskets. The waterproof layer is made of waterproof material, which covers the outside of the geotextile and is fixedly connected to the concrete surface of the pipe gallery segment.

[0009] Preferably, the sealing unit includes a caulking rubber sealing strip, a high-modulus polyurethane sealant, a water-swellable sealing gasket, an elastic sealing gasket, a water-blocking rubber ring, a sealing gasket, and a sealant arranged sequentially from the outside to the inside along the Z-shaped structure.

[0010] Preferably, the outer port of the Z-shaped structure is provided with a first groove around the stepped groove and the stepped protrusion surface, and the two first grooves are joined to form a complete first mounting groove around the axis of the adjacent pipe gallery segment. The caulking rubber sealing strip includes a sealing part embedded in the first mounting groove and a connecting part integrally connected to the outer end of the sealing part. The connecting part is a wing plate structure extending to both sides, and the inner surface of the wing plate structure is provided with sealant for bonding with the concrete on the outer surface of the pipe gallery segment.

[0011] Preferably, the sealing part has a drainage hole in the middle along the direction of the caulking rubber sealing strip, and the drainage hole forms a drainage channel for guiding water that intrudes into the outside of the pipe gallery segment.

[0012] Preferably, the stepped groove and the stepped protrusion end of the inner side of the first groove are joined to form a first joint. The first joint surrounds the axis of the adjacent pipe gallery segment, and the annular surface of the inner wall of the first joint is perpendicular to the axis of the pipe gallery segment. A high-modulus polyurethane sealant is extruded and connected in the first joint. A water-swellable sealing gasket and an elastic sealing gasket are also sequentially provided in the first joint on the side of the high-modulus polyurethane sealant.

[0013] Preferably, the two side walls of the first joint are respectively provided with first limiting grooves for limiting the water-swellable sealing gasket and the elastic sealing gasket; the cross-section of the elastic sealing gasket is hexagonal and its thickness is greater than that of the water-swellable sealing gasket.

[0014] Preferably, the inner end of the first joint is connected to a second joint that is arranged along the axial direction of the pipe gallery segment and around the axial direction of the pipe gallery segment. The second joint is perpendicular to the first joint. A water-blocking rubber ring is provided in the second joint that surrounds the axial direction of the pipe gallery segment. A second limiting groove is provided on the inner wall of the second joint to limit the water-blocking rubber ring.

[0015] Preferably, the inner end of the second joint is connected to a third joint that is arranged perpendicular to and around the axis of the pipe gallery segment. The inner end of the third joint penetrates the inner wall of the pipe gallery segment. A sealing gasket is provided inside the third joint and arranged around the axis of the pipe gallery segment. A third limiting groove is provided on the inner wall of the third joint to limit the sealing gasket.

[0016] Preferably, the inner port of the third joint is provided with a second mounting groove around the segment axis of the pipe gallery. The second mounting groove is formed by connecting the second grooves respectively located on the inner edge of the stepped groove and the inner edge of the stepped structure. The width of the second mounting groove is greater than the width of the third joint, and sealant is embedded in the second mounting groove.

[0017] Preferably, a spigot gasket and a socket gasket are respectively embedded at the inner wall corners of the second and first butt joints near the spigot structure and at the inner wall corners of the second and third butt joints near the socket.

[0018] This novel stepped, multi-level waterproof structure for integrated pipe gallery joints has the following beneficial effects: This novel pipe gallery splicing unit has an outer waterproof caulking layer filled with high-modulus polyurethane sealant, which, together with the external waterproof layer, forms a complete external sealing mechanism. This significantly reduces the possibility of water seepage from the outside into the splicing joint. The pipe gallery segment joints are also equipped with several sealing units, forming a complex seepage path in the internal splicing joint. Combined with the external waterproof layer, this ultimately forms a multi-stage, multi-layered waterproof effect, creating a safe and reliable water-proof function. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the splicing of adjacent pipe gallery segments in this new type of utility model; Figure 2 This is a partially enlarged schematic diagram of the socket structure of this novel invention; Figure 3 A partial schematic diagram showing the installation of the caulking rubber sealing strip of this novel invention; Figure 4 This is a schematic diagram of the structure of the novel caulking rubber sealing strip; Figure 5 This is a cross-sectional structural diagram of the novel multi-level waterproof structure; Figure 6 This is a schematic cross-sectional view of the installation structure of the elastic sealing gasket of this novel invention; Figure 7 This is a schematic diagram of the cross-sectional structure of the waterproof unit installation of this novel invention.

[0020] Marked in the image: 01. First joint; 02. Second joint; 03. Third joint; 1. Front section of the pipe gallery; 2. Adjacent rear section of the pipe gallery; 3. Prestressed duct; 4. First groove; 5 / 6. First limiting groove; 7. Second limiting groove; 8. Third limiting groove; 9. Second groove; 10. Inner edge of the pipe gallery; 11. Drainage hole; 12. Reverse wing span; 13. Wing plate structure; 14. High modulus polyurethane sealant; 15. Joint sealing rubber strip; 151. Sealing part; 152. Connection part; 153. Drainage channel; 16. Water-swellable sealing gasket; 17. Elastic sealing gasket; 18. Socket gasket; 19. Socket gasket; 20. Waterproof rubber ring; 21. Sealing gasket; 22. Sealant; 23. Cement nail; 24. Plastic round gasket; 25. Geotextile buffer layer; 26. Waterproof layer; 27. Iron gasket. Detailed Implementation

[0021] The following is a detailed description of the embodiments of the present invention in a step-by-step manner. This description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0022] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on this invention.

[0023] Example 1: A stepped, multi-level waterproof structure for integrated pipe gallery joints, such as Figure 1-7 As shown, the integrated utility tunnel is composed of several tunnel segments spliced ​​together. The rear end of the front tunnel segment 1 forms a socket structure, and the front end of the adjacent rear tunnel segment 2 is provided with a spigot structure that cooperates with the socket structure. When the socket structure and the spigot structure are connected, a multi-level sealing structure is used to achieve sealing. The multi-level sealing structure includes waterproof units located at the outer and inner ends of the connection and several sealing units located on the inner side of the connection. Adjacent tunnel segments are tightened and fixed together by prestressed steel bars.

[0024] Example 2: Specifically, such as Figure 1 , 2 As shown in Figures 5 and 7, the socket structure is provided with a stepped groove (e.g., Figure 5 As shown, its cross-section is stepped, with the lower end of the step located on the inner side, forming a groove that mates with the socket structure. The socket structure has stepped protrusions (such as...). Figure 5 As shown, its cross-section is stepped, with the lower end of the step on the outside and the upper end on the inside, forming a stepped protrusion that mates with the socket structure. When the socket structure and the spigot structure are joined, the cross-sectional orientation at the joint forms a Z-shaped structure (e.g., Figure 5 As shown, waterproof units are provided at the outer and inner ends of the Z-shaped structure and around the outer and inner walls of the adjacent pipe gallery segments, respectively. A sealing unit is provided on the inner side of the Z-shaped structure, surrounding the axis of the pipe gallery segment and tightly fitting with the stepped groove and stepped protrusion.

[0025] Example 3: Specifically, such as Figure 5 , 7 As shown, the waterproof unit includes a geotextile buffer layer 25 and a waterproof layer 26 (common waterproof materials such as rubber can be selected). The geotextile buffer layer 25 is tightly fitted to both sides of the outer or inner port of the joint to block the inner and outer ports of the joint, and is fixedly connected to the concrete of the pipe gallery segment by cement nails 23 and gaskets. The waterproof layer is made of waterproof material, which covers the outside of the geotextile and is fixedly connected to the concrete surface of the pipe gallery segment. The gaskets may include plastic round gaskets 24 and iron gaskets 27, and their installation method is a common approach, serving to assist the cement nails in fixing the geotextile to the surface of the pipe gallery segment.

[0026] Example 4: Specifically, the sealing unit includes a caulking rubber sealing strip 15, a high-modulus polyurethane sealant 14, a water-swellable sealing gasket 16, an elastic sealing gasket 17, a water-blocking rubber ring 20, a sealing gasket 21, and a sealant 22 arranged sequentially from the outside to the inside along the Z-shaped structure.

[0027] The outer port of the Z-shaped structure is surrounded by a stepped groove and the stepped protrusion surface is provided with a first groove 4 (e.g., Figure 2, 3 As shown), two first grooves 4 are joined together to form a complete first mounting groove that surrounds the axis of adjacent pipe rack segments. The caulking rubber sealing strip 15 includes a sealing part 151 embedded in the first mounting groove and a connecting part 152 integrally connected to the outer end of the sealing part 151. The connecting part 152 forms a wing plate structure 13 extending to both sides. The inner surface of the wing plate structure 13 is provided with sealant for bonding with the concrete on the outer surface of the pipe rack segment.

[0028] like Figure 3 , 4 As shown, the sealing part 151 has a drainage hole 11 in the middle along the direction of the caulking rubber sealing strip 15. The drainage hole 11 forms a drainage channel 153 for guiding water that intrudes into the outside of the pipe gallery section.

[0029] Example 5: Specifically, such as Figure 2 , 5 As shown, the stepped groove and the stepped protrusion end of the inner side of the first groove 4 are joined to form a first joint 01. The first joint 01 surrounds the axis of the adjacent pipe gallery segment, and the annular surface of the inner wall of the first joint 01 is perpendicular to the axis of the pipe gallery segment. A high modulus polyurethane sealant 14 is extruded and connected in the first joint 01. A water-swellable sealing gasket 16 and an elastic sealing gasket 17 are also sequentially provided in the first joint 01 where the high modulus polyurethane sealant 14 is located.

[0030] like Figure 2 , 5 As shown, the two side walls of the first butt joint 01 are respectively provided with first limiting grooves (5, 6) for limiting the water-swellable sealing gasket 16 and the elastic sealing gasket 17; the cross-section of the elastic sealing gasket 17 is hexagonal and its thickness is greater than that of the water-swellable sealing gasket 16.

[0031] like Figure 2 , 5 As shown, the inner end of the first joint 01 is connected to a second joint 02 that is arranged along the axial direction of the pipe gallery segment and around the axial direction of the pipe gallery segment. The second joint 02 is perpendicular to the first joint 01. A water-blocking rubber ring 20 surrounding the axial direction of the pipe gallery segment is provided in the second joint 02. A second limiting groove 7 is provided on the inner wall of the second joint 02 to limit the water-blocking rubber ring.

[0032] like Figure 2 , 5As shown, the inner end of the second joint 02 is connected to a third joint 03 that is arranged perpendicular to and around the axis of the pipe gallery segment. The inner end of the third joint 03 penetrates the inner wall of the pipe gallery segment. A sealing gasket 21 is provided inside the third joint 03 and arranged around the axis of the pipe gallery segment. A third limiting groove 8 is provided on the inner wall of the third joint 03 to limit the sealing gasket 21.

[0033] like Figure 2 , 5 As shown, the inner port of the third joint 03 is provided with a second mounting groove around the segment axis of the pipe gallery. The second mounting groove is formed by the connection of the second grooves 9 respectively located on the inner edge of the stepped groove and the inner edge of the stepped structure. The width of the second mounting groove is greater than the width of the third joint 03. Sealant 22 is embedded in the second mounting groove.

[0034] like Figure 2 , 5 As shown, a socket gasket 18 and a socket gasket 19 are respectively embedded at the inner wall corners of the second butt joint 02 and the first butt joint 01 near the spigot structure and at the inner wall corners of the second butt joint 02 and the third butt joint 03 near the socket.

[0035] The working principle of this new type: like Figure 1 As shown, each of the pipe gallery segments has prestressed ducts 3 so that prestressing can be performed by steel bars or steel strands after splicing. The rear end of the pipe gallery segment 1 on the front side forms a socket structure, and the front end of the adjacent pipe gallery segment 2 on the rear side forms a spigot structure. The socket structure and the spigot structure are respectively a stepped groove and a stepped protrusion. When the two are joined, they form a Z-shaped splice seam. Waterproof units are provided on the outer and inner sides of the joint, and multiple sealing units are formed on the inner side of the joint.

[0036] The first groove 4 is connected to form the first installation groove to constrain the caulking rubber sealing strip 15, which can effectively prevent water from the outside of the pipe gallery segment from seeping through the splicing gap. The first joint inside the first installation groove is provided with high modulus polyurethane sealant 14 to further improve the sealing performance of the first joint. The self-adhesive of the caulking rubber sealing strip 15 is bonded to the outside of the pipe gallery splicing joint with concrete. This structure has the function of absorbing seismic forces and mitigating pipe gallery displacement caused by later changes in rock and soil stress, thus protecting the pipe gallery segment.

[0037] Traditional caulking waterproofing often uses a structure composed of a single closed-cell polyethylene foam material. This makes it difficult to completely fill the joints during construction, and the sealant may peel off under long-term exposure to groundwater, resulting in unsatisfactory waterproofing. Therefore, a caulking rubber sealing strip 15 is used to replace the traditional sealing structure. (See [reference]) Figure 4As shown, the caulking rubber sealing strip 15 is composed of a drainage hole 11, a reverse-positioned wing 12, and a wing plate 13. While waterproofing, it also has a certain function of draining leaking water.

[0038] The internal waterproofing structure of the integrated utility tunnel interface is located throughout the entire cross-section of the socket-type interface, with each waterproofing structure installed sequentially according to the cross-section interface and its internal and external positions. (See also...) Figure 5 As shown, a water-swellable sealing gasket 16 is used to absorb the seeping water and block it through its expansion effect. For the unblocked seeping water, the elastic sealing gasket 17 greatly reduces the seepage velocity and flow rate. In addition, the internal waterproof structure of the integrated pipe gallery interface includes a rubber gasket at the socket to alleviate uneven settlement problems in the later stages of pipe gallery splicing and operation, a water-blocking rubber ring 20 at the socket to increase the seepage path and seepage difficulty, and a sealing gasket 21 inside the splice joint to achieve a waterproof structure inside the splice joint.

[0039] The elastic sealing gasket 17 is compressed under stress, causing it to deform significantly and fill the pores of the contact surface. Under the action of elastic restoring force, it generates significant contact pressure, preventing seepage water from flowing through the contact gap or greatly slowing down the seepage rate, thus achieving a sealing and waterproofing effect. Traditional elastic sealing gaskets are mostly semi-closed structures with a closed upper end and a toothed lower end. After assembly, the upper parts of the gaskets are squeezed together to create a tight contact, but the lower part, due to its toothed structure, has a small contact area with the concrete of the pipe gallery joint, making it prone to leakage. Therefore, this new type uses a fully enclosed sealing gasket for sealing and waterproofing.

[0040] In addition, to ensure waterproofing at the joints, a waterproof layer is installed at the inner and outer joints. This waterproof layer is achieved by unfolding and flattening the geotextile buffer layer 25 onto the inner and outer walls of the pipe gallery, and securing it with cement nails 23, iron washers 27, and plastic round washers 24. The waterproof layer 26 can be manually welded to the plastic round washers 24 using a hot air welding gun. The weld should be firm and reliable to prevent the waterproof layer 26 from falling off. The edges of the waterproof layer should be sealed to the concrete it contacts. After the waterproof layer 26 is laid, an air-filling test is performed using a leak detector.

[0041] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A stepped, multi-level waterproof structure for a joint in a utility tunnel, wherein the utility tunnel is composed of several tunnel segments spliced ​​together, the rear end of the front tunnel segment forms a socket structure, and the front end of the adjacent rear tunnel segment is provided with a spigot structure that mates with the socket structure, characterized in that, When the socket structure and spigot structure are connected, a multi-level sealing structure is used to achieve sealing. The multi-level sealing structure includes waterproof units located at the outer and inner ends of the connection, and several sealing units located on the inner side of the connection. Adjacent pipe gallery sections are tightened and fixed by prestressed steel bars.

2. The stepped multi-level waterproof structure for integrated pipe gallery joints as described in claim 1, characterized in that: The socket structure is provided with a stepped groove, and the spigot structure is provided with a stepped protrusion. When the socket structure and the spigot structure are connected, the cross-sectional orientation at the connection point forms a Z-shaped structure. Waterproof units are provided at the outer and inner ends of the Z-shaped structure and around the outer and inner walls of the adjacent pipe gallery segments. A sealing unit is provided on the inner side of the Z-shaped structure, surrounding the axis of the pipe gallery segment and tightly fitting the stepped groove and the stepped protrusion.

3. The stepped multi-level waterproof structure for integrated pipe gallery joints as described in claim 2, characterized in that: The waterproof unit includes a geotextile buffer layer and a waterproof layer. The geotextile buffer layer is tightly attached to both sides of the outer or inner port of the joint and is fixedly connected to the concrete of the pipe gallery segment by cement nails and gaskets. The waterproof layer is made of waterproof material, which covers the outside of the geotextile and is fixedly connected to the concrete surface of the pipe gallery segment.

4. The stepped multi-level waterproof structure for integrated pipe gallery joints as described in claim 3, characterized in that: The sealing unit includes a caulking rubber sealing strip, a high-modulus polyurethane sealant, a water-swellable sealing gasket, an elastic sealing gasket, a water-blocking rubber ring, a sealing gasket, and sealant arranged sequentially from the outside to the inside along the Z-shaped structure.

5. The stepped multi-level waterproof structure for integrated pipe gallery joints as described in claim 4, characterized in that: The outer port of the Z-shaped structure is provided with a first groove around the stepped groove and the stepped protruding surface. The two first grooves are joined to form a complete first installation groove around the axis of the adjacent pipe gallery segment. The caulking rubber sealing strip includes a sealing part embedded in the first installation groove and a connecting part integrally connected to the outer end of the sealing part. The connecting part is a wing plate structure extending to both sides. The inner surface of the wing plate structure is provided with sealant for bonding with the concrete on the outer surface of the pipe gallery segment. The sealing part has a drainage hole in the middle along the direction of the caulking rubber sealing strip. The drainage hole forms a drainage channel to guide water that intrudes into the outside of the pipe gallery section.

6. The stepped multi-level waterproof structure for integrated pipe gallery joints as described in claim 5, characterized in that: The stepped groove and the stepped protrusion end of the first groove are joined together to form a first joint. The first joint surrounds the axis of the adjacent pipe gallery segment and the annular surface of the inner wall of the first joint is perpendicular to the axis of the pipe gallery segment. High modulus polyurethane sealant is extruded and connected in the first joint. Water-swellable sealing gasket and elastic sealing gasket are also sequentially provided in the first joint on the side of high modulus polyurethane sealant. The first butt joint has first limiting grooves on both sides of its side wall surfaces for limiting the water-swellable sealing gasket and the elastic sealing gasket; the elastic sealing gasket has a hexagonal cross-section and a thickness greater than that of the water-swellable sealing gasket.

7. The stepped multi-level waterproof structure for integrated pipe gallery joints as described in claim 6, characterized in that: The inner end of the first joint is connected to a second joint that is arranged along the axial direction of the pipe gallery segment and around the axis of the pipe gallery segment. The second joint is perpendicular to the first joint. A water-blocking rubber ring is provided in the second joint and surrounds the axis of the pipe gallery segment. A second limiting groove is provided on the inner wall of the second joint to limit the water-blocking rubber ring.

8. The stepped multi-level waterproof structure for integrated pipe gallery joints as described in claim 7, characterized in that: The inner end of the second joint is connected to a third joint that is arranged perpendicular to and around the axis of the pipe gallery segment. The inner end of the third joint penetrates the inner wall of the pipe gallery segment. A sealing gasket is provided inside the third joint and arranged around the axis of the pipe gallery segment. A third limiting groove is provided on the inner wall of the third joint to limit the sealing gasket.

9. The stepped multi-level waterproof structure for integrated pipe gallery joints as described in claim 8, characterized in that: The inner port of the third joint is provided with a second mounting groove around the segment axis of the pipe gallery. The second mounting groove is formed by connecting the second grooves respectively located on the inner edge of the stepped groove and the inner edge of the stepped structure. The width of the second mounting groove is greater than the width of the third joint, and sealant is embedded in the second mounting groove.

10. The stepped multi-level waterproof structure for integrated pipe gallery joints as described in claim 9, characterized in that: A spigot gasket and a socket gasket are respectively embedded at the inner wall corners of the second and first butt joints near the spigot structure and at the inner wall corners of the second and third butt joints near the socket.

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