Waterproof structure of tunnel construction joint

Abstract

The application relates to a tunnel construction joint waterproof structure. The application is suitable for the technical field of waterproof structures. The application adopts the technical scheme that a tunnel construction joint waterproof structure comprises a foundation concrete layer arranged on the inner side of a tunnel base body, a waterproof groove is arranged at the joint of the foundation concrete layer and a circumferential construction joint on the tunnel base body, waterproof pieces capable of plugging the circumferential construction joint are arranged in the waterproof groove, a self-adhesive waterproof coiled material layer is arranged on the inner wall of the foundation concrete layer and located on the circumferential side of the waterproof groove, the self-adhesive waterproof coiled material layer can provide a first waterproof barrier, a stress transition layer is arranged on the inner wall of the self-adhesive waterproof coiled material layer and located on the circumferential side of the waterproof groove, the stress transition layer can relieve the stress borne by the self-adhesive waterproof coiled material layer, a waterproof paint composite layer is arranged on the inner wall of the stress transition layer and covers the end of the waterproof groove, the waterproof paint composite layer can provide a second waterproof barrier, and a protective layer is arranged on the inner wall of the waterproof paint composite layer and can provide protection for the waterproof paint composite layer.

Description

Technical Field

[0001] This utility model relates to the field of waterproof structure technology, and in particular to a waterproof structure for tunnel construction joints. Background Technology

[0002] Waterproofing structures for tunnel construction joints are a crucial component of tunnel engineering. During tunnel construction, construction joints are inevitably left in the tunnel walls due to segmentation, material joints, or structural deformation. If these joints are not properly treated, they can become channels for moisture penetration, affecting the overall structural safety and service life of the tunnel. Therefore, the design and construction of waterproofing structures for tunnel construction joints are of paramount importance. They not only effectively prevent groundwater, rainwater, and other external moisture from seeping into the tunnel, but also protect the tunnel structure from moisture erosion, ensuring the long-term stable operation of the tunnel.

[0003] Traditional waterproofing techniques for tunnel construction joints primarily rely on physical barriers such as waterstops and waterproof membranes. While these methods offer some waterproofing, they have several drawbacks. Firstly, traditional waterstops and similar materials are prone to aging, damage, or displacement under long-term stress, seepage pressure, and environmental factors, leading to a gradual decline in their waterproofing performance. Secondly, traditional waterproofing techniques are difficult to implement, requiring highly skilled construction workers, and quality control during construction is challenging. These issues not only affect the waterproofing effect of tunnel construction joints but may also pose a potential threat to the overall structural safety of the tunnel.

[0004] Therefore, there is an urgent need for a more reliable and durable waterproofing structure for tunnel construction joints to address the shortcomings of traditional technologies. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a waterproof structure for tunnel construction joints, addressing the aforementioned problems.

[0006] The technical solution adopted in this utility model is: a waterproof structure for tunnel construction joints, comprising: The foundation concrete layer is located inside the tunnel substrate. A waterproof groove is provided at the junction of the foundation concrete layer and the circumferential construction joint on the tunnel substrate. A waterproof component capable of sealing the circumferential construction joint is provided inside the waterproof groove. The self-adhesive waterproof membrane layer is placed on the inner wall of the base concrete layer and located on the periphery of the waterproof groove, which can provide the first waterproof barrier. The stress transition layer is located on the inner wall of the self-adhesive waterproof membrane layer and on the periphery of the waterproof groove, which can relieve the stress on the self-adhesive waterproof membrane layer. A waterproof coating composite layer, located on the inner wall of the stress transition layer and covering the ends of the waterproof groove, can provide a second waterproof barrier; The protective layer, located on the inner wall of the waterproof coating composite layer, provides protection for the waterproof coating composite layer.

[0007] Using the above technical means, waterproof components are first used to seal the waterproof grooves, and then the waterproof components, self-adhesive waterproof membrane layer and waterproof coating composite layer are used together to form multiple waterproof barriers. Furthermore, a stress transition layer is set between the self-adhesive waterproof membrane layer and the waterproof coating composite layer. The stress transition layer can alleviate the risk of direct cracking of the waterproof layer due to the deformation of the base layer and reduce the probability of the waterproof layer failing due to structural deformation. Finally, a protective layer is configured to protect the waterproof coating composite layer.

[0008] In some embodiments, the waterproof coating composite layer includes a first waterproof coating layer and a second waterproof coating layer. The first waterproof coating layer is disposed on the inner wall of the stress transition layer and is located on the periphery of the waterproof groove. The second waterproof coating layer is disposed between the first waterproof coating layer and the protective layer and covers the end of the waterproof groove.

[0009] In some embodiments, both the first waterproof coating layer and the second waterproof coating layer are made of high-performance polyurethane waterproof coating.

[0010] In some embodiments, the waterproof component includes a water-swellable rubber strip that expands to fill the waterproof groove after absorbing water.

[0011] In some embodiments, the self-adhesive waterproof membrane layer comprises a polyethylene waterproof membrane.

[0012] In some embodiments, the stress transition layer comprises a fiber mesh fabric.

[0013] In some embodiments, the protective layer comprises a nano-silica modified coating.

[0014] The beneficial effects of this utility model are: 1. By sealing the waterproof grooves and internal construction joints with waterproof components, the structural constraints of these components reduce the risk of displacement caused by concrete deformation. A multi-layered composite waterproof structure is constructed using waterproof components, self-adhesive waterproof membrane layers, and waterproof coating layers, effectively preventing water penetration and improving the overall reliability and durability of the waterproofing. A stress transition layer is incorporated to effectively absorb and disperse adverse factors such as concrete structural deformation and temperature stress, preventing the waterproof layer from cracking or peeling due to stress concentration, significantly improving the deformation resistance and durability of the waterproofing system. The protective layer safeguards the waterproof coating composite layer, reducing damage caused by external factors. Attached Figure Description

[0015] Figure 1 This is a structural diagram of this application.

[0016] Figure 2 This is a cross-sectional structural diagram of this application.

[0017] Figure 3 This is a schematic diagram of the cross-sectional structure of this application.

[0018] Explanation of reference numerals in the attached figures: 1. Base concrete layer; 2. Self-adhesive waterproof membrane layer; 3. Stress transition layer; 4. First waterproof coating layer; 5. Waterproof groove; 6. Waterproof component; 7. Second waterproof coating layer; 8. Protective layer.

[0019] This specification includes references to "one embodiment" or "implementation". The use of the phrase "in one embodiment" or "in an embodiment" does not necessarily refer to the same embodiment. Specific features, structures, or characteristics may be combined in any suitable manner consistent with this disclosure.

[0020] The term "comprising" is open-ended. As used in the appended claims, it does not exclude additional structures or steps.

[0021] "First," "second," etc. As used in this article, these terms serve as labels for the nouns preceding them and do not imply any type of ordering (e.g., spatial, temporal, logical, etc.).

[0022] The term "based on," as used herein, describes one or more factors that influence the determination. This term does not exclude additional factors influencing the determination. That is, the determination may be based solely on these factors or at least partially on them. Consider the phrase "A is determined based on B." In this case, B is the factor influencing the determination of A, and such phrases do not exclude the possibility that the determination of A may also be based on C. In other instances, A may be determined solely on B. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below with reference to specific embodiments.

[0024] Combination Figures 1 to 3As shown, this embodiment is a waterproof structure for tunnel construction joints, including a foundation concrete layer 1, a self-adhesive waterproof membrane layer 2, a stress transition layer 3, a waterproof coating composite layer, and a protective layer 8. The foundation concrete layer 1 is located inside the tunnel substrate. A waterproof groove 5 is provided at the junction of the foundation concrete layer 1 and the circumferential construction joint on the tunnel substrate. A waterproof component 6 capable of sealing the circumferential construction joint is provided inside the waterproof groove 5. The self-adhesive waterproof membrane layer 2 is located on the inner wall of the foundation concrete layer 1, surrounding the waterproof groove 5, providing a first waterproof barrier. The stress transition layer 3 is located on the inner wall of the self-adhesive waterproof membrane layer 2, surrounding the waterproof groove 5, and can alleviate the stress on the self-adhesive waterproof membrane layer 2. The waterproof coating composite layer is located on the inner wall of the stress transition layer 3, covering the end of the waterproof groove 5, providing a second waterproof barrier. The protective layer 8 is located on the inner wall of the waterproof coating composite layer, providing protection for the waterproof coating composite layer.

[0025] In some embodiments, the waterproof coating composite layer includes a first waterproof coating layer 4 and a second waterproof coating layer 7. The first waterproof coating layer 4 is disposed on the inner wall of the stress transition layer 3 and is located on the periphery of the waterproof groove 5. The second waterproof coating layer 7 is disposed between the first waterproof coating layer 4 and the protective layer 8 and covers the end of the waterproof groove 5.

[0026] Furthermore, in this embodiment, both the first waterproof coating layer 4 and the second waterproof coating layer 7 are made of high-performance polyurethane waterproof coating. The thickness of the first waterproof coating layer 4 is 1.5mm. This appropriate thickness ensures waterproof performance and durability, avoiding both excessive thickness that increases costs and insufficient thickness that affects the waterproof effect. The thickness of the second waterproof coating layer 7 is 5mm. This thicker second waterproof coating layer 7 provides additional waterproof protection, enhances the waterproof performance of the construction joint, and ensures the long-term safe use of the tunnel.

[0027] High-performance polyurethane waterproof coatings possess excellent waterproofing performance and adhesion, forming a dense waterproof layer that further enhances the waterproofing effect. The first waterproof coating layer 4 provides a base waterproof membrane, uniformly covering the surface of the stress transition layer 3 to form a continuous and dense waterproof membrane. The second waterproof coating layer 7 is superimposed on the first layer and extends to cover the ends of the waterproof grooves 5, providing focused thickening and sealing for the construction joints, the most vulnerable and prone to water seepage. This double-layer coating increases the total coating thickness, improving puncture and crack resistance, making it particularly suitable for long-term water pressure environments.

[0028] In some implementations, the waterproof component 6 includes a water-swellable rubber strip that expands to fill the waterproof groove 5 after absorbing water.

[0029] Water-swellable rubber expands several times its volume upon contact with water seepage, automatically filling the gaps inside the waterproof groove 5 and irregular areas of the circumferential construction joint, achieving "dynamic sealing" and compensating for construction errors. Compared to ordinary rubber waterstops, water-swellable rubber adheres more tightly to construction joints, making it especially suitable for irregular or difficult-to-align joints.

[0030] In some implementations, the self-adhesive waterproof membrane layer 2 comprises a high-density polyethylene waterproof membrane.

[0031] High-density polyethylene waterproof membrane boasts excellent water resistance and durability. This membrane not only provides superior waterproofing but also effectively prevents groundwater penetration, ensuring the tunnel's interior remains dry. The self-adhesive layer forms a full bond with concrete or leveling layers, preventing water seepage. It can be applied even to damp substrates, demonstrating strong adaptability.

[0032] In some implementations, the stress transition layer 3 comprises a high-strength fiber mesh, and in this embodiment, the thickness of the stress transition layer 3 is 1 mm.

[0033] High-strength fiber mesh fabric can withstand certain stress changes, preventing damage to the waterproof layer due to stress concentration and improving the stability of the waterproof structure. The fiber mesh fabric has high tensile strength and low elongation, effectively dispersing and transferring stress, preventing cracks caused by concrete shrinkage, temperature changes, or uneven settlement from extending to the waterproof layer.

[0034] In some implementations, the protective layer 8 includes a nano-silica modified coating, and in this embodiment, the thickness of the protective layer 8 is 0.5 mm.

[0035] Nano-silica modified coatings possess excellent weather resistance and anti-aging properties, protecting the underlying waterproof layer from external environmental erosion and extending the service life of the waterproof structure.

[0036] The implementation principle of a waterproof structure for tunnel construction joints in this embodiment of the utility model is as follows: The foundation concrete layer 1 serves as the supporting base for the entire waterproof structure, providing a load-bearing platform for subsequent waterproofing components. Waterproof grooves 5 created within the construction joints provide installation space for water-swellable rubber strips. These strips expand upon contact with water, filling the groove gaps and forming a waterproof sealing line, enhancing the waterproofing effect at the construction joints and ensuring water cannot penetrate. High-density polyethylene waterproof membrane is used as the self-adhesive waterproof membrane layer 2, adhering tightly to the inner surface of the foundation concrete layer 1 as a waterproof barrier. The stress transition layer 3 effectively disperses and absorbs stress generated during tunnel construction or geological changes, preventing the waterproof layer from cracking due to excessive stress, thus ensuring the long-term stability of the waterproof structure and enhancing its overall integrity. The first waterproof coating layer 4, applied to the inner surface of the stress transition layer 3, forms a waterproof barrier, while the second waterproof coating layer 7 enhances the waterproofing effect at the construction joints. The excellent waterproofing performance and good adhesion of the high-performance polyurethane waterproof coating make the entire waterproof structure more compact and robust. The protective layer 8, coated on the inner side of the second waterproof coating layer 7, can protect the inner waterproof layer from external environmental erosion. The nano-silica modified coating not only has excellent weather resistance and corrosion resistance, but also effectively resists the damage of external factors to the waterproof layer, thereby ensuring the long-term stability and reliability of the waterproof structure of the tunnel construction joint.

[0037] Meanwhile, considering that the waterproof groove 5 formed by the construction joint is itself a structural section abrupt change area, there is a risk of stress concentration. If multiple layers of flexible materials are stacked in this groove area, it is easy to cause weak interlayer bonding, forming a "weak interlayer," and the area is prone to cracking and delamination during subsequent structural deformation. Therefore, in this embodiment, a waterproof groove 5 is opened at the construction joint, and a partial space is left between the self-adhesive waterproof membrane layer 2, the stress transition layer 3, and the water-swellable rubber, which can protect the free expansion space of the water-swellable rubber, ensure active filling of the gap between the construction joint and the waterproof groove 5, and achieve "self-adaptive sealing." The end of the groove is covered by a subsequent waterproof coating composite layer to achieve a seamless connection of "overlap sealing."

[0038] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A waterproof structure for tunnel construction joints, characterized in that, include: The foundation concrete layer (1) is located inside the tunnel substrate. A waterproof groove (5) is provided at the junction of the foundation concrete layer (1) and the circumferential construction joint on the tunnel substrate. A waterproof component (6) capable of sealing the circumferential construction joint is provided inside the waterproof groove (5). The self-adhesive waterproof membrane layer (2) is located on the inner wall of the base concrete layer (1) and on the periphery of the waterproof groove (5), which can provide the first waterproof barrier. The stress transition layer (3) is provided on the inner wall of the self-adhesive waterproof membrane layer (2) and is located on the periphery of the waterproof groove (5), which can relieve the stress on the self-adhesive waterproof membrane layer (2). The waterproof coating composite layer is disposed on the inner wall of the stress transition layer (3) and covers the end of the waterproof groove (5), which can provide a second waterproof barrier; The protective layer (8) is located on the inner wall of the waterproof coating composite layer and can provide protection for the waterproof coating composite layer.

2. The waterproof structure for tunnel construction joints according to claim 1, characterized in that: The waterproof coating composite layer includes a first waterproof coating layer (4) and a second waterproof coating layer (7). The first waterproof coating layer (4) is disposed on the inner wall of the stress transition layer (3) and is located on the periphery of the waterproof groove (5). The second waterproof coating layer (7) is disposed between the first waterproof coating layer (4) and the protective layer (8) and covers the end of the waterproof groove (5).

3. The waterproof structure for tunnel construction joints according to claim 2, characterized in that: Both the first waterproof coating layer (4) and the second waterproof coating layer (7) are made of high-performance polyurethane waterproof coating.

4. The waterproof structure for tunnel construction joints according to claim 1, characterized in that: The waterproof component (6) includes a water-swellable rubber strip that can expand and fill the waterproof groove (5) after absorbing water.

5. A waterproof structure for tunnel construction joints according to claim 1, characterized in that: The self-adhesive waterproof membrane layer (2) includes polyethylene waterproof membrane.

6. The waterproof structure for tunnel construction joints according to claim 1, characterized in that: The stress transition layer (3) comprises a fiber mesh fabric.

7. A waterproof structure for tunnel construction joints according to claim 1, characterized in that: The protective layer (8) includes a nano-silica modified coating.

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