Waterproof structure at deformation joint of comprehensive pipe gallery and construction method thereof

Abstract

The application discloses a kind of comprehensive pipe gallery deformation joint place waterproof structure and its construction method, the comprehensive pipe gallery deformation joint place waterproof structure includes: first waterproof structure, is laid in the below and side portion of comprehensive pipe gallery bottom plate;Second waterproof structure is buried in the inside of comprehensive pipe gallery bottom plate and / or fixed on the outer surface of comprehensive pipe gallery bottom plate, the second waterproof structure is arranged at the deformation joint of two adjacent comprehensive pipe gallery bottom plate;Grouting pipe combined waterproof system is buried in the inside of comprehensive pipe gallery bottom plate, and the discharge port of grouting pipe combined waterproof system is located at deformation joint or construction joint.This application relies on the self-waterproof characteristics of concrete structure, adopts the waterproof form of coiled material waterproofing and flexible waterproofing material combination, and grouting pipe is buried simultaneously, considers the adverse factors such as pipe gallery later settlement, multiple waterproof system, guarantees the waterproof effect of comprehensive pipe gallery deformation joint place, effectively solves the leakage problem of comprehensive pipe gallery.

Description

Technical Field

[0001] This invention relates to the field of waterproofing construction technology for integrated utility tunnels, specifically to a waterproofing structure and construction method for expansion joints in integrated utility tunnels. Background Technology

[0002] Integrated utility tunnels are a rapidly developing type of infrastructure construction project both domestically and internationally in recent years. Because they are built underground, they are difficult to renovate, and the quality of their waterproofing has a significant impact on their functionality. Emerging integrated utility tunnel projects differ from traditional underground waterproofing projects in their waterproofing technology, possessing their own unique characteristics. Leakage problems are particularly prominent in underground engineering projects.

[0003] Utility tunnels are the arteries of urban underground infrastructure, and water leakage has always been a common quality problem plaguing underground utility tunnel projects. As a "century-long project," effective waterproofing is of paramount importance for underground utility tunnels. Utility tunnels are basically horizontal, continuous structures buried underground, and generally have many nodes and expansion joints. Even with rubber or steel waterstops installed at expansion joints and nodes, the combined effects of factors such as the creep of underground silt, the dynamic load of large vehicles on the surface, the lateral pressure generated by surrounding buildings, and uneven settlement of the structure can cause varying degrees of misalignment, uplift, and tearing of the waterstops at the expansion joints of the utility tunnel, leading to water leakage and posing safety hazards to various pipes and pipelines inside.

[0004] Waterproofing at the expansion joints of the utility tunnel is a key and challenging aspect of the overall waterproofing project. Leaks are very common at these joints, and the quality of construction is difficult to guarantee, often leading to defects. Summary of the Invention

[0005] Therefore, the technical problem to be solved by this invention is to overcome the defect of easy water leakage at the expansion joints of utility tunnels, thereby providing a waterproof structure and construction method for the expansion joints of integrated utility tunnels. This invention successfully solves the problem of difficult waterproofing and easy leakage in underground integrated utility tunnels by adopting a design for the self-waterproofing and external waterproofing material structure and construction method, while shortening the construction period, standardizing construction, and improving quality.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A waterproof structure for expansion joints in integrated utility tunnels includes:

[0008] The first waterproof structure is laid continuously under and on the side of the base plate of the integrated utility tunnel;

[0009] The second waterproof structure is embedded inside the base plate of the integrated utility tunnel and / or fixed to the outer surface of the base plate of the integrated utility tunnel. The second waterproof structure is set at the expansion joint of two adjacent base plates of the integrated utility tunnel.

[0010] The grouting conduit waterproofing system is embedded inside the base slab of the integrated utility tunnel, and the outlet of the grouting conduit waterproofing system is located at the expansion joint or construction joint. The grouting conduit waterproofing system is used to inject grout into the expansion joint or construction joint to seal the leak when there is uneven settlement at the expansion joint between two adjacent base slabs of the integrated utility tunnel or when the joint is not tightly sealed, resulting in leakage.

[0011] The technical solution has been further optimized, and the grouting conduit combination waterproofing system includes:

[0012] Several connecting pipes are embedded in the bottom slab of the integrated pipe gallery and have grout outlets at their ends, which are located at expansion joints or construction joints.

[0013] Several grouting conduits are embedded in the bottom slab of the integrated utility tunnel and connected to the connecting pipe for grouting into the connecting pipe.

[0014] To further optimize the technical solution, the grouting conduit combination waterproofing system also includes:

[0015] At least one pair of water-swellable sealing strips, each pair of which is located on both sides of the grout outlet of the connecting pipe, is suitable for sealing expansion joints or construction joints.

[0016] The technical solution has been further optimized, and the first waterproof structure includes:

[0017] A waterproof layer, which is laid continuously under and on the sides of the base slab of the integrated pipe gallery, is a TPO polymer roll material;

[0018] A double-sided polymer-modified bitumen waterproofing material layer is laid below and on the outside of the waterproofing layer, and located at the expansion joint, to prevent the expansion joint from settling and cracking and to provide waterproofing.

[0019] To further optimize the technical solution, a padding layer is provided below the first waterproof structure;

[0020] And / or a waterproof protective layer is provided between the first waterproof structure and the base plate of the integrated utility tunnel to prevent damage to the first waterproof structure during the construction of the base plate of the integrated utility tunnel.

[0021] The technical solution has been further optimized, and the second waterproof structure includes:

[0022] An external rubber waterstop is attached to the outer surface of the integrated utility tunnel floor slab and connected to the floor slab.

[0023] The embedded steel-edged rubber waterstop is circumferentially embedded inside the bottom slab of the integrated utility tunnel, with its flared end facing outwards.

[0024] A water-stop steel plate is pre-embedded at the construction joint location, with the flared end facing outwards.

[0025] Further optimization of the technical solution also includes at least one of the following:

[0026] A penetrating cement crystalline coating layer is applied to the construction joint;

[0027] A waterproof reinforcement layer is provided at the corners of the first waterproof structure and on the outside of the first waterproof structure, and is arranged along the horizontal direction of the pipe gallery;

[0028] A rigid polyurethane foam layer, which is hydrophobic and disposed above the permanent brick wall, and located outside the first waterproof structure.

[0029] Expansion joint liner, wherein the expansion joint liner is arranged circumferentially and located between two adjacent pipe racks;

[0030] A butyl rubber putty sheet is provided at the second waterproof structure to prevent leakage at the joint.

[0031] A construction method for a waterproof structure at the expansion joint of a utility tunnel includes the following steps:

[0032] S1. Constructing permanent and temporary brick walls;

[0033] S2. Construction of the first waterproof structure;

[0034] S3. Construct the second waterproof structure above the first waterproof structure;

[0035] S4. A combined waterproofing system with pre-embedded grouting conduits at the expansion joints and construction joints of the integrated utility tunnel floor slab, used to inject grout into the expansion joints or construction joints to seal leaks;

[0036] S5. Construct the base slab of the integrated utility tunnel;

[0037] S6. Waterproof the construction joints;

[0038] S7. Construct the side wall of the integrated utility tunnel and demolish the temporary brick wall.

[0039] To further optimize the technical solution, a 10cm thick C20 fine stone concrete cushion layer is poured before proceeding to step S1.

[0040] To further optimize the technical solution, step S2 includes the following steps:

[0041] Install a TPO waterproof membrane reinforcement layer;

[0042] TPO waterproof membrane is laid horizontally at the expansion joint of the bottom slab of the integrated utility tunnel; the waterproof membrane is laid to a height exceeding the temporary brick wall on the side of the utility tunnel.

[0043] A double-sided polymer-modified bitumen waterproofing material is applied to the TPO waterproof membrane, and the expansion joint is located at the center of the double-sided polymer-modified bitumen waterproofing material.

[0044] Further optimize the technical solution by constructing a waterproof protective layer above the first waterproof structure after step S2.

[0045] Step S3 includes the following steps:

[0046] Install the external rubber waterstop onto the outer surface of the waterproof protective layer;

[0047] Pre-embed the embedded steel-edged rubber waterstop.

[0048] To further optimize the technical solution, in step S7, after removing the temporary brick wall, double-sided polymer-modified asphalt waterproofing material is directly applied to the side wall of the integrated utility tunnel, followed by spraying of quick-setting rubber asphalt waterproofing coating.

[0049] Then a rigid polyurethane foam protective layer is sprayed on.

[0050] The technical solution of this invention has the following advantages:

[0051] 1. This invention provides a waterproof structure for expansion joints in integrated utility tunnels. In addition to a double waterproof structure, it also incorporates a grouting conduit system at the expansion joint for waterproofing construction. When uneven settlement occurs at the expansion joint between adjacent base slabs of integrated utility tunnels, or when the joints at construction joints are not tightly sealed, leading to leakage, grout can be directly injected into the expansion joint or construction joint through the grouting conduit system. The injected grout fills the gaps at the leakage points, thus achieving the function of sealing the leak. This solves the problems of poor waterproofing effect and leakage at expansion joints in traditional single waterproofing methods for integrated utility tunnels, and addresses the waterproofing difficulties faced by urban underground integrated utility tunnels.

[0052] 2. The waterproof structure at the expansion joint of the integrated utility tunnel provided by this invention relies on the self-waterproofing characteristics of the concrete structure and adopts a waterproofing method that combines rolled waterproofing material with flexible waterproofing material. At the same time, grouting pipes are embedded to take into account adverse factors such as the later settlement of the utility tunnel. The multiple waterproofing system ensures the waterproofing effect at the expansion joint of the integrated utility tunnel and effectively solves the leakage problem of the integrated utility tunnel.

[0053] 3. The present invention provides a waterproof structure for expansion joints in integrated utility tunnels. The waterproof system of the grouting conduit combination also includes a water-swellable waterstop strip. The water-swellable waterstop strip is a sealing and water-stopping material. When it comes into contact with grout, it will self-expand, thereby sealing the expansion joint or construction joint, and further enhancing the sealing function of the expansion joint or construction joint.

[0054] 4. The present invention provides a waterproof structure for expansion joints in integrated pipe corridors. A pad layer is provided below the first waterproof structure to level the working surface, so that the waterproof membrane adheres smoothly, ensuring that the waterproof membrane is not easily damaged and improving the waterproof effect.

[0055] 5. The present invention provides a waterproof structure at the expansion joint of an integrated utility tunnel, wherein a waterproof protective layer is provided between the first waterproof structure and the base plate of the integrated utility tunnel. The waterproof protective layer is a concrete structure and is constructed on TPO polymer membrane to prevent damage to the waterproof membrane during the construction of the base plate of the integrated utility tunnel.

[0056] 6. The present invention provides a waterproof structure at the expansion joint of a comprehensive utility tunnel, wherein a waterproof reinforcement layer is provided at the corner of the first waterproof structure where the waterproof membrane is prone to tearing, in order to enhance the waterproof effect.

[0057] This invention also includes a quick-setting rubber asphalt waterproof coating layer. This spray-applied flexible waterproof material adheres tightly, allowing for small-area penetration and repair. Damage to a single area does not affect the overall waterproofing effect; minor damage can automatically repair itself. Construction is simple, with rapid setting upon spraying. Efficacy is enhanced.

[0058] The invention also includes a rigid polyurethane foam layer for preventing water seepage at the bottom of the foundation pit or rainwater from soaking the waterproof membrane.

[0059] The present invention also includes expansion joint lining plates, which can prevent structural damage caused by the expansion and creep of concrete and play a buffering role.

[0060] In this invention, a butyl rubber putty sheet is provided at the connection between the water-stop steel plate and the embedded steel-edged rubber water-stop. Rivets are used at the connection between the water-stop steel plate and the embedded steel-edged rubber water-stop, and the added sheet effectively prevents leakage at the connection.

[0061] 7. The present invention provides a construction method for a waterproof structure at the expansion joint of a utility tunnel. By applying the waterproof construction technology of the utility tunnel, the construction efficiency can be greatly improved, the waterproof quality of the project can be guaranteed, and the waste of subsequent repair construction materials can be reduced, thus reducing the burden on the environment. Attached Figure Description

[0062] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0063] Figure 1 This is a schematic diagram of the waterproof structure of the bottom plate at the expansion joint of the integrated pipe gallery according to the present invention;

[0064] Figure 2 This is a transition diagram of the waterproof layer between the bottom slab and the side wall of the integrated utility tunnel according to the present invention;

[0065] Figure 3 This is a diagram showing the structural form of the grouting conduit of the present invention;

[0066] Figure 4 This is a schematic diagram of the installation of the grouting conduit and the water-swellable sealing strip of the present invention;

[0067] Figure 5 This is a schematic diagram of the installation of the embedded steel-edged rubber waterstop of the present invention;

[0068] Figure 6 This is a schematic diagram of the water-stop steel plate structure of the present invention;

[0069] Figure 7 This is a schematic diagram of the connection between the embedded steel-edged rubber waterstop and the waterstop steel plate of the present invention;

[0070] Figure 8 This is a schematic diagram of the connection between the embedded steel-edged rubber waterstop and the waterstop steel plate from another perspective.

[0071] Figure 9 This is a structural diagram of the external rubber waterstop of the present invention;

[0072] Figure 10 This is a flowchart illustrating the construction method of the waterproof structure at the expansion joint of the integrated utility tunnel according to the present invention.

[0073] Attached reference numerals: 1. Subbase, 2. Waterproof reinforcement layer, 3. Chamfer, 4. Permanent brick wall, 5. Waterproof layer, 6. Waterproof protective layer, 7. External rubber waterstop, 8. Expansion joint lining plate, 9. Temporary brick wall, 10. Leveling layer, 11. Grouting conduit, 12. Waterstop steel plate, 13. Integrated pipe gallery base plate, 14. Embedded steel-edged rubber waterstop, 141. Embedded steel-edged rubber waterstop steel edge, 15. Penetrating cement crystallizing coating layer, 16. Water-swellable waterstop strip, 18. Rigid polyurethane foam layer, 19. Double-sided polymer-modified bitumen waterproof material layer, 20. Butyl rubber putty sheet, 21. Rivet, 22. Construction joint, 23. Connecting pipe, 24. Connector. Detailed Implementation

[0074] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0075] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0076] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0077] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0078] To prevent leakage in integrated utility tunnels, it is essential to consider multiple aspects, including design, material selection, and construction, to ensure the project's quality. During construction, the self-waterproofing of the concrete structure should be used as the foundation for waterproofing. Reliable waterproofing control structures should be employed to improve overall waterproofing performance. Special attention should be paid to the waterproofing performance of detailed structures such as construction joints and expansion joints, as these are crucial for the overall waterproofing of the integrated utility tunnel.

[0079] Example 1

[0080] like Figures 1 to 9 The embodiment of a waterproof structure at the expansion joint of a utility tunnel shown includes: a first waterproof structure, a second waterproof structure, and a combined waterproof system of grouting conduits.

[0081] The first waterproof structure is laid under and on the sides of the integrated utility tunnel floor slab 13. The integrated utility tunnel floor slab 13 is made of P8 impermeable concrete and serves a waterproof function.

[0082] The second waterproof structure is embedded inside the base plate 13 of the integrated utility tunnel and / or fixed to the outer surface of the base plate 13 of the integrated utility tunnel. The second waterproof structure is set at the expansion joint of two adjacent base plates 13 of the integrated utility tunnel.

[0083] The grouting conduit waterproofing system is embedded inside the bottom slab 13 of the integrated utility tunnel, and the outlet of the grouting conduit waterproofing system is located at the expansion joint or construction joint.

[0084] The aforementioned waterproofing structure for expansion joints in integrated utility tunnels, in addition to employing a double-layer waterproofing structure, also incorporates a grouting conduit system at the expansion joint for waterproofing construction. When uneven settlement occurs at the expansion joint between adjacent base slabs of the integrated utility tunnel, or when the joint at the construction joint is not tightly sealed, leading to leakage, grout can be directly injected into the expansion joint or construction joint through the grouting conduit system. The injected grout fills the gaps at the leakage points, achieving the function of sealing the leak. This solves the problems of poor waterproofing effect and leakage at expansion joints associated with traditional single-layer waterproofing methods in integrated utility tunnels.

[0085] As one specific implementation method, the grouting conduit combination waterproofing system includes: a connecting pipe 23 and a grouting conduit 11.

[0086] Several connecting pipes 23 are provided. The connecting pipes 23 are buried in the bottom plate 13 of the integrated pipe gallery and have grout outlets at their ends. The grout outlets are located at the expansion joints or construction joints, so that the grout discharged from the grout outlets can directly seal the leakage parts at the expansion joints or construction joints.

[0087] Several grouting conduits 11 are installed, embedded in the base slab 13 of the integrated utility tunnel and the side wall structure of the construction joint, and connected to the connecting pipe 23, allowing for structural grouting later. The distance between the two furthest grouting conduits 11 is 5-6m, and the height of the grouting conduits 11 is 2-3m. The grouting conduits enable later crack grouting and leak sealing, preventing leakage caused by uneven settlement at the deformation joints of the utility tunnel, and preventing leakage caused by loose bonding at the construction joint 22 of the utility tunnel.

[0088] In this invention, a plurality of connectors 24 are spaced apart on the connecting pipe 23, and multiple connecting pipes 23 can be connected by the connectors 24. The distance between two adjacent connectors 24 is 2-3m.

[0089] As a further improved implementation, the grouting conduit combination waterproofing system also includes at least one pair of water-swellable sealing strips 16. Each pair of water-swellable sealing strips 16 is located on both sides of the grout outlet of the connecting pipe 23. The water-swellable sealing strips 16 are sealing and waterproofing materials. When they come into contact with grout, they will expand on their own, thereby sealing the expansion joint or construction joint, further enhancing the sealing function of the expansion joint or construction joint 22.

[0090] In one specific implementation, the first waterproof structure includes: a waterproof layer 5 and a double-sided polymer-modified bitumen waterproof material layer 19. This embodiment uses a combination of waterproof membrane and double-sided polymer-modified bitumen waterproofing for waterproofing the expansion joints of the pipe gallery.

[0091] Waterproof layer 5 is laid continuously below and on the sides of the base slab 13 of the integrated utility tunnel, and is installed on the subbase. Waterproof layer 5 is a TPO polymer membrane. When encountering expansion joints, a double-sided polymer-modified bitumen waterproof layer is added between the subbase and the waterproof membrane. No such layer is installed in other locations. This material can be directly pre-laid and bonded, or it can be connected by applying an adhesive coating.

[0092] Double-sided polymer-modified bitumen waterproofing construction material is a reinforcing material at expansion joints. Unlike the reinforcing layer, which is placed at corners and overlapping joints, the double-sided polymer-modified bitumen waterproofing construction material base slab is laid continuously and extends to the temporary brick wall. The material is flexible, preventing the expansion joint from settling and cracking, while effectively bonding the waterproof membrane for effective waterproofing.

[0093] The temporary brick wall is built together with the permanent brick wall. When the side wall waterproofing is carried out, it is chiseled to expose the new waterproof membrane joints. Most of the original exposed waterproof membrane joints are destroyed during construction. The side wall waterproof membrane is overlapped on the new joints to improve the waterproofing effect.

[0094] As a further improved implementation, a cushion layer 1 is provided below the first waterproof structure. The function of the cushion layer is to: level the working surface, ensure the waterproof membrane adheres smoothly, prevent damage to the waterproof membrane, and improve the waterproof effect. The cushion layer is made of C15 concrete and is constructed on a foundation trench with qualified bearing capacity.

[0095] As a further improved implementation method, a waterproof protective layer 6 is provided between the first waterproof structure and the base plate 13 of the integrated utility tunnel. The waterproof protective layer is a concrete structure, generally C20 fine stone concrete, which is constructed on TPO polymer membrane to prevent damage to the waterproof membrane during the construction of the base plate of the integrated utility tunnel.

[0096] As one specific implementation method, the second waterproof structure includes: an external rubber waterstop 7, a centrally embedded steel-edged rubber waterstop 14, and a waterstop steel plate 12.

[0097] The external rubber waterstop 7 is made of rubber with a multi-fold structure, allowing it to adhere better to the concrete. It is placed on the waterproof protective layer and connected to the base slab 13 of the integrated utility tunnel.

[0098] The embedded steel-edged rubber waterstop 14 is set parallel to the external rubber waterstop, both in a circumferential direction with the flared end facing outward, effectively waterproofing the surface.

[0099] The water-stop steel plate 12 is pre-embedded at the construction joint, with the flared end facing outwards, effectively blocking water.

[0100] The present invention also includes a penetrating cement crystallizing coating layer 15. The penetrating cement crystallizing coating layer 15 is a penetrating cement crystallizing coating, which is applied to the construction joint to make the construction joint fit tightly.

[0101] The present invention also includes a waterproof reinforcement layer 2. The waterproof reinforcement layer 2 is provided at the corner of the first waterproof structure where the waterproof membrane is prone to tearing, that is, the waterproof reinforcement layer 2 is provided at the chamfered corners on both sides of the bottom plate of the integrated pipe gallery in an L-shape, to enhance the waterproof effect.

[0102] At the gentle corners of the walls, the waterproofing surface is designed with a chamfer of 3. This chamfer is created during the cement mortar plastering process to protect the waterproof membrane, prevent hollow areas during installation, and prevent angle cracking during concrete pouring. Before constructing the waterproofing reinforcement layer at the inside and outside corners of the pipe gallery, the inside corners are chamfered with 50*50mm 1:1.25 cement mortar, and the outside corners are rounded with a radius greater than or equal to 10mm and treated as 20*20 chamfers. Then, a 500mm wide waterproof reinforcement layer and waterproof membrane are applied sequentially, with the waterproof reinforcement layer arranged horizontally along the pipe gallery.

[0103] Furthermore, the waterproof reinforcement layer 2 is also set on the outside of the first waterproof structure, that is, a 500mm wide waterproof reinforcement layer is set on the outside of the first waterproof structure near the construction joint.

[0104] This invention also includes a quick-setting rubber asphalt waterproof coating layer. This spray-applied flexible waterproof material adheres tightly, allowing for small-area penetration and repair. Damage to a single area does not affect the overall waterproofing effect; minor damage can automatically repair itself. Construction is simple, with rapid setting upon spraying. Efficacy is enhanced.

[0105] The invention also includes a rigid polyurethane foam layer 18. The rigid polyurethane foam layer 18 has high hardness, protects the waterproof layer, and is itself hydrophobic. It is positioned above the permanent brick wall 4 and located outside the first waterproof structure. The permanent brick wall is constructed of bricks and stones, with an external cement mortar plaster, and is built on top of the foundation layer to prevent water seepage from the bottom of the foundation pit or rainwater from soaking the waterproof membrane.

[0106] The present invention also includes a leveling layer 10, which is a cement mortar material, providing a flat laying surface for the side wall waterproof membrane and also assisting in structural leveling.

[0107] The present invention also includes an expansion joint liner 8. The expansion joint liner 8 is arranged circumferentially between two adjacent pipe racks, perpendicular to the externally applied rubber waterstop. The expansion joint liner 8 can prevent structural damage caused by the expansion and creep of concrete, and plays a buffering role.

[0108] A butyl rubber putty sheet 20 is provided on the steel edge 141 of the embedded steel-edged rubber waterstop 12 and the waterstop steel plate 12. Rivets 21 are used at the connection between the waterstop steel plate 12 and the embedded steel-edged rubber waterstop 14 to add the putty sheet, effectively preventing leakage at the connection. The rivets are installed from the inside out.

[0109] This invention solves the waterproofing problem faced by urban underground utility tunnels. It employs a design combining external rubber waterstops at the expansion joints with embedded steel-edged rubber waterstops in the middle of the structure. It also combines waterproof membrane with double-sided polymer-modified asphalt waterproofing for waterproofing the expansion joints. Furthermore, grouting conduits are embedded at the expansion joints. In this waterproofing system, the two layers of waterproofing at the expansion joints provide self-waterproofing; the modified asphalt flexible waterproofing material effectively adheres to the expansion joint, while the external waterproof membrane provides effective external waterproofing. In the event of uneven settlement in the utility tunnel, grouting can be directly injected through the grouting conduits. This invention, through the combination of grouting and a flexible waterproof layer, prevents water leakage in the utility tunnel. Simultaneously, this invention proposes a specific construction method to avoid construction problems and effectively solve the waterproofing difficulties at the expansion joints of underground utility tunnels.

[0110] Example 2

[0111] Based on Example 1, this example discloses a construction method for a waterproof structure at the expansion joint of a utility tunnel. In addition to the self-waterproofing of the structure itself with two waterstops, the present invention uses a combination of waterproof membrane and double-sided polymer-modified asphalt waterproofing, and simultaneously embeds grouting conduits at the expansion joint to form a waterproof system for waterproofing the expansion joint of the utility tunnel.

[0112] A construction method for waterproofing structures at expansion joints in integrated utility tunnels, such as... Figure 10 As shown, the specific steps include:

[0113] S1. Pour a 10cm thick C20 fine aggregate concrete cushion layer.

[0114] The permanent and temporary brick walls are constructed after the concrete foundation of the integrated utility tunnel is poured.

[0115] S2. Construction of the first waterproofing structure includes the following steps:

[0116] Construction of TPO waterproof membrane reinforcement layer.

[0117] TPO waterproof membrane is laid horizontally at the expansion joint of the integrated utility tunnel floor slab. The waterproof membrane is laid to a height exceeding the temporary brick wall on the side of the utility tunnel and is protected during construction.

[0118] Double-sided polymer-modified bitumen waterproofing material is applied to the TPO waterproof membrane, with the expansion joint located in the center of the double-sided polymer-modified bitumen waterproofing material.

[0119] The construction of the waterproof protective layer 6 is carried out on top of the first waterproof structure, that is, the pouring of the concrete waterproof protective layer on the TPO waterproof membrane.

[0120] S3. Construction of the second waterproofing structure above the first waterproofing structure, specifically including the following steps:

[0121] Install the external rubber waterstop 7 onto the outer surface of the waterproof protective layer 6;

[0122] The embedded steel-edged rubber waterstop 14 is pre-embedded.

[0123] S4. A combined waterproofing system with pre-embedded grouting conduits at the expansion joints and construction joints of the integrated utility tunnel floor slab is used to inject grout into the expansion joints or construction joints to seal leaks. The grouting conduits are pre-embedded at the expansion joints and construction joints during the construction of the integrated utility tunnel floor slab.

[0124] S5. Pour the bottom slab of the integrated utility tunnel (13).

[0125] S6. Waterproof the construction joint. Specifically, apply a penetrating cementitious crystalline coating to the construction joint at position 22.

[0126] A waterstop steel plate 12 with a thickness of 3mm is embedded. Rivets are driven at the connection between the waterstop steel plate 12 and the steel edge of the embedded steel-edged rubber waterstop 14, and a butyl rubber putty sheet 20 with a thickness of 1.5mm is added.

[0127] S7. Construct the side wall of the integrated utility tunnel, remove the temporary brick wall, and demolish the permanent brick wall. After removing the temporary brick wall, directly overlap the double-sided polymer modified bitumen waterproofing material at the side wall of the integrated utility tunnel.

[0128] A double-sided polymer-modified bitumen waterproofing material reinforcement layer is installed at the external corner.

[0129] Then, apply the quick-setting rubber asphalt waterproof coating by spraying.

[0130] After the quick-setting rubber asphalt waterproof coating is applied, a rigid polyurethane foam protective layer is sprayed on.

[0131] The above-mentioned construction method for waterproofing structures at expansion joints in integrated utility tunnels can significantly improve construction efficiency, ensure the quality of waterproofing, and help reduce the consumption of subsequent repair materials, thus lessening the burden on the environment.

[0132] The specific construction methods for the waterproofing structure at the expansion joint of the aforementioned integrated utility tunnel are as follows:

[0133] 1. Construction method of TPO waterproof membrane

[0134] Lay the TPO polymer roll material on the underlayment according to the marked lines. The roll material should be flat and straight, without twisting, with an overlap width of not less than 80mm, and should be appropriately cut.

[0135] The twin-wheel crawling welding machine welds each lap edge, using a double weld seam.

[0136] Cut the roll material to fit the corresponding nodes and weld the sheet material onto the large roll material using a handheld welding gun.

[0137] Add a 1.5mm thick self-adhesive double-sided polymer-modified bitumen waterproof membrane.

[0138] After passing the inspection, a 50mm thick C20 fine aggregate concrete protective layer is poured.

[0139] 2. Attention to detail

[0140] At the expansion joint of the base plate, TPO polymer roll material + a 1000mm wide TPO polymer roll material reinforcement layer laid in the middle (300mm fully bonded at the ends, 400mm loosely laid in the middle) + 50mm waterproof protective layer + external waterstop + embedded steel edge rubber waterstop, polyethylene foam sealant board + two-component polysulfide sealant for filling the joint.

[0141] A galvanized steel waterstop is installed at construction joint 22. The joint is then coated with a cement-based penetrating crystalline waterproofing coating at a dosage of 1.5 kg / m². 2 A 500mm wide waterproof reinforcement layer is installed on the outside.

[0142] The overlapping edges of the roll material are fully bonded by hot melt. One person heats the roll material, and then another person uses a large steel pressure roller to carry out the air removal and compaction process to remove the air under the roll material and prevent wrinkles from occurring.

[0143] Before constructing the waterproof reinforcement layer at the inside and outside corners of the utility tunnel, the inside corners are beveled with 50*50mm 1:1.25 cement mortar, and the outside corners are rounded with a radius of 10mm or more. The outside corners of the base plate are beveled with 20*20mm. Then, a 500mm wide waterproof reinforcement layer and waterproof membrane are applied in sequence.

[0144] 3. Spraying quick-setting rubber asphalt for waterproofing construction

[0145] First, install asphalt reinforcement layers in special areas such as inside and outside corners and construction joints.

[0146] When applying a large-area waterproof coating by spraying, the spray gun should be perpendicular to the substrate, at a moderate distance, and moved evenly. Multiple coats should be applied in a staggered pattern to achieve the designed thickness of 2.5mm. The dosage of the quick-setting rubber asphalt waterproof coating is 4.0 kg / m². 2 .

[0147] When constructing structural facades such as sloping side walls, the spray gun should be used to spray in a sequence from bottom to top and from low to high.

[0148] 4. Construction of rigid polyurethane foam

[0149] After the quick-setting rubber asphalt waterproof coating has been sprayed for 1 hour and passed inspection, a 20mm thick rigid polyurethane foam waterproof protective layer is sprayed sequentially from the top of the brick formwork, from bottom to top.

[0150] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A utility tunnel deformation joint waterproof structure, characterized in that, include: The first waterproof structure is laid under and on the side of the bottom slab (13) of the integrated pipe gallery; The first waterproof structure includes: a waterproof layer (5) and a double-sided polymer-modified bitumen waterproof material layer (19); the waterproof layer (5) is laid on the bottom and sides of the integrated pipe gallery floor slab (13), and the waterproof layer (5) is a TPO polymer roll material; the double-sided polymer-modified bitumen waterproof material layer (19) is laid on the bottom and outer sides of the waterproof layer (5) and located at the expansion joint to prevent the expansion joint from settling and cracking and to waterproof; The second waterproof structure is embedded inside the base plate (13) of the integrated utility tunnel and / or fixed to the outer surface of the base plate (13). The second waterproof structure is set at the deformation joint of two adjacent base plates (13). The grouting conduit combination waterproofing system is embedded inside the base plate (13) of the integrated pipe gallery, and the outlet of the grouting conduit combination waterproofing system is located at the deformation joint or construction joint; the grouting conduit combination waterproofing system is used to inject grout into the deformation joint or construction joint to seal the leak when there is uneven settlement at the deformation joint between two adjacent integrated pipe gallery base plates or when the joint is not tightly connected at the integrated pipe gallery construction joint.

2. The waterproof structure for a deformation joint of a utility tunnel according to claim 1, wherein The grouting conduit assembly waterproofing system includes: Several connecting pipes (23) are embedded in the bottom plate (13) of the integrated pipe gallery and have grout outlets at their ends. The grout outlets are located at the deformation joints or construction joints. Several grouting conduits (11) are embedded in the bottom plate (13) of the integrated pipe gallery and connected to the connecting pipe (23) for grouting into the connecting pipe (23).

3. The waterproof structure for a deformation joint of a utility tunnel according to claim 2, wherein The grouting conduit assembly waterproofing system also includes: At least one pair of water-swellable sealing strips (16), each pair of water-swellable sealing strips (16) is located on both sides of the grout outlet of the connecting pipe (23), suitable for sealing deformation joints or construction joints.

4. The waterproof structure for a deformation joint of a utility tunnel according to claim 1, wherein A padding layer (1) is provided below the first waterproof structure; A waterproof protective layer (6) is provided between the first waterproof structure and the base plate (13) of the integrated utility tunnel to prevent damage to the first waterproof structure during the construction of the base plate of the integrated utility tunnel.

5. The waterproof structure for a deformation joint of a utility tunnel according to claim 1, wherein The second waterproof structure includes: An external rubber waterstop (7) is attached to the outer surface of the integrated utility tunnel base plate (13) and connected to the integrated utility tunnel base plate (13). Embedded steel-edged rubber waterstop (14), the embedded steel-edged rubber waterstop (14) is circumferentially embedded inside the bottom plate (13) of the integrated pipe gallery, and the opening is flared outward; Water-stop steel plate (12), which is pre-embedded at the construction joint and has an outward flare.

6. The waterproof structure for a deformation joint of a utility tunnel according to any one of claims 1 to 5, characterized in that, It also includes at least one of the following: A penetrating cement crystallizing coating layer (15) is applied to the construction joint; Waterproof reinforcement layer (2), the waterproof reinforcement layer (2) is provided at the corner of the first waterproof structure and on the outside of the first waterproof structure, and is arranged along the horizontal direction of the pipe gallery; a hard foam polyurethane layer (18) having hydrophobicity and being arranged above the permanent brick wall (4) and outside the first waterproof structure; a deformation joint gasket plate (8) arranged circumferentially and between two adjacent pipe galleries; a butyl rubber putty sheet (20) arranged at the second waterproof structure to prevent leakage at the connection.

7. A construction method of a utility tunnel deformation joint waterproof structure, characterized by, The method is a construction method of a deformation joint waterproof structure of a comprehensive pipe gallery according to any one of claims 1 to 6, comprising the following steps: S1. building a permanent brick wall and a temporary brick wall; S2. construction of the first waterproof structure; S3. construction of the second waterproof structure above the first waterproof structure; S4. a deformation joint and construction joint position of the comprehensive pipe gallery bottom plate (13) embedded grouting pipe combined waterproof system for grouting to the deformation joint or construction joint to stop leakage; S5. pouring of the comprehensive pipe gallery bottom plate (13); S6. waterproof treatment of the construction joint; S7. pouring of the comprehensive pipe gallery side wall and removing the temporary brick wall.

8. The construction method of a waterproof structure for a deformation joint of a utility tunnel according to claim 7, wherein Before step S1, pouring of a 10 cm thick C20 fine stone concrete cushion is performed.

9. The construction method of a waterproof structure for a deformation joint of a utility tunnel according to claim 7, wherein The step S2 comprises the following steps: arranging a TPO waterproof coiled material reinforcing layer; lateral laying of TPO waterproof coiled material at the deformation joint of the comprehensive pipe gallery bottom plate; the laying height of the waterproof coiled material is higher than the lateral temporary brick wall of the pipe gallery; arranging double-sided polymer modified bitumen waterproof material on the TPO waterproof coiled material, and the deformation joint is in the center of the double-sided polymer modified bitumen waterproof material.

10. The construction method of a waterproof structure for a deformation joint of a utility tunnel according to claim 7, wherein After step S2, construction of the waterproof protective layer (6) above the first waterproof structure is performed; The step S3 comprises the following steps: installing an externally attached rubber waterstop (7) to the outer surface of the waterproof protective layer (6); pre-burying a center-buried steel edge rubber waterstop (14).

11. The construction method of a waterproof structure of a utility tunnel deformation joint according to claim 7, characterized in that, In the step S7, after removing the temporary brick wall, double-sided polymer modified bitumen waterproof material is directly overlapped and constructed at the comprehensive pipe gallery side wall, and then rapid-setting rubber asphalt waterproof coating is sprayed and constructed; and then a hard foam polyurethane protective layer is sprayed.

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