Shield tunnel segment joint waterproof material and waterproof structure

Abstract

The invention relates to the technical field of shield tunnel construction, and discloses a shield tunnel segment joint waterproof material and a waterproof structure, the shield tunnel segment joint waterproof material comprises a component A and a component B; the component A comprises the following component: 30-40 parts of liquid polysulfide rubber; 5 to 10 parts of a fluorinated polyurethane prepolymer; 1-5 parts of a silane coupling agent; 3-5 parts of fumed silica; 8-15 parts of hollow glass beads; 10 to 15 parts of nano calcium carbonate; 0.5 to 2 parts of polytetrafluoroethylene micro powder; 0.1 to 1 part of ettringite; the component B comprises the following component: 1-5 parts of manganese dioxide; and 5 to 10 parts of dioctyl phthalate. By utilizing the characteristics that the sealing gasket has excellent fluidity during injection and can be automatically cured into a high elastomer within a set time, a pre-installed sealing gasket can be replaced by adopting an innovative injection process, and the construction difficulty faced by high-precision shield segment assembly in a high-water-pressure environment is effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shield tunnel construction, and particularly relates to a shield tunnel segment joint waterproof material and a waterproof structure. BACKGROUND

[0002] As an important part of modern urban infrastructure, the continuous innovation of shield tunnel construction technology promotes the development and utilization of underground space, but the safety of long-term operation depends largely on excellent waterproof performance, especially the waterproof design of segment joint parts. With the construction of a large number of shield tunnels, the hydrogeological conditions through which these tunnels pass are becoming increasingly complex, resulting in widespread leakage problems in the project. A large number of joints undoubtedly become potential channels for water leakage. Therefore, the waterproof problem has become a major challenge to the further development of shield tunnels.

[0003] At present, the waterproofing of tunnel joints mainly relies on ethylene propylene diene rubber (EPDM), which is usually achieved by installing waterproof sealing pads in trapezoidal grooves. In some cases, water stop belts or special-shaped grooves are also used during construction. In addition, some scholars have proposed schemes for using some new types of waterproof sealing pads for waterproofing. Although these methods have their own characteristics, overall, the traditional sealing pad and groove form are still the main waterproof treatment means.

[0004] Although traditional ethylene propylene diene rubber (EPDM) has good elasticity and durability, in high water pressure environments, direct installation of traditional sealing pads often causes problems such as large installation resistance, inaccurate positioning, and easy falling off and failure of sealing pads under high water pressure impact or assembly pressure, leading to construction difficulties. SUMMARY

[0005] To solve the above technical problems, the present application provides a shield tunnel segment joint waterproof material, which comprises A component and B component; According to the weight fraction, the A component comprises the following components: Liquid polysulfide rubber 30-40 parts; Fluorinated polyurethane prepolymer 5-10 parts; Silane coupling agent 1-5 parts; Fumed silica 3-5 parts; Hollow glass microbeads 8-15 parts; Nano calcium carbonate 10-15 parts; Polytetrafluoroethylene micro powder 0.5-2 parts; Aluminate 0.1-1 part; The B component comprises the following components: Manganese dioxide 1-5 parts; Dioctyl phthalate 5-10 parts; The fluorinated polyurethane prepolymer is prepared from a fluorine-containing polyether diol and diisocyanate.

[0006] Another object of the present application is to provide a shield tunnel segment joint waterproof structure, comprising at least two adjacent segments, each of the segments is provided with a groove on the side surface, and the grooves on the two adjacent segments are combined to form a reserved groove after the two segments are connected.

[0007] Further, the cross section of the reserved groove is in the shape of a gyroscope.

[0008] Further, the segment is provided with an injection hole and an exhaust hole, and the injection hole and the exhaust hole are communicated with the reserved groove.

[0009] Further, the exhaust hole is further provided with a valve.

[0010] Further, the valve is a one-way check valve.

[0011] Further, the sealing body is provided with a support body.

[0012] Further, the support body is prepared by injecting a support material.

[0013] Further, the support material comprises the following components in terms of weight ratio: 50-55 parts of silicate cement; 15-20 parts of quick-setting activator; 5-10 parts of silica fume; 1-2 parts of nano-silicon dioxide; 0.5-1 part of quicklime; 1-5 parts of metakaolin; 0.1-1 part of polypropylene fiber; 1-2 parts of EVA latex powder; 0.1-0.5 part of boric acid retarder; 0.1-0.5 part of polycarboxylic acid superplasticizer.

[0014] Further, the quick-setting activator is sodium water glass.

[0015] The embodiment of the present application has the following technical effects: The shield tunnel segment joint waterproof material provided by the present application has excellent fluidity when injected, and can automatically solidify into a high-elastic body within a set time, so that the innovative injection process can replace the pre-installed sealing gasket, and effectively solve the construction difficulty problem faced by high-precision assembly of shield segments in a high water pressure environment. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the accompanying drawings needed to be used in the description of the specific embodiments or the prior art will be briefly introduced. Obviously, the accompanying drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort based on these drawings.

[0017] Figure 1 is a structure diagram of a shield tunnel segment joint waterproof structure in the present application Figure 1 ; Figure 2 is a local enlarged view of A in the present application Figure 1 ; Figure 3 is a local enlarged view of B in the present application Figure 1 ; Figure 4 is a local enlarged view of C in the present application Figure 1 ; Figure 5 is a structure diagram of a shield tunnel segment joint waterproof structure in the present application Figure 2 ; Figure 6 is a local enlarged view of D in the present application Figure 5 ; Figure 7 is an assembly sectional view of a shield tunnel segment joint waterproof structure in the present application Figure 8 is a local enlarged view of E in the present application Figure 7 ; Figure 9 is a local enlarged view of F in the present application Figure 7 ; Figure 10 is an assembly sectional view of a shield tunnel segment joint waterproof structure in the present application Figure 11 is a local enlarged view of G in the present application Figure 10 ; Figure 12 is a local enlarged view of H in the present application Figure 10 .

[0018] In the drawings: 1 - segment; 2 - groove; 3 - reserved groove; 4 - sealing body; 5 - injection hole; 6 - exhaust hole; 7 - valve; 8 - support body. DETAILED DESCRIPTION

[0019] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the present application.

[0020] Based on the problem that it is difficult to directly install a traditional sealing gasket in a high water pressure environment, the present application provides a shield tunnel segment joint waterproof material, which comprises component A and component B. The component A comprises the following components in parts by weight: Liquid polysulfide rubber 30-40 parts; Fluorinated polyurethane prepolymer 5-10 parts; Silane coupling agent 1-5 parts; Fumed silica 3-5 parts; Hollow glass microbeads 8-15 parts; Nano calcium carbonate 10-15 parts; Polytetrafluoroethylene (PTFE) micro powder 0.5-2 parts; Calcium aluminate 0.1-1 part; The component B comprises the following components: Manganese dioxide 1-5 parts; Dioctyl phthalate 5-10 parts; The fluorinated polyurethane prepolymer is prepared from a fluorine-containing polyether diol and diisocyanate.

[0021] When the waterproof material is used, the component A and the component B are mixed and then injected into the corresponding reserved groove of the waterproof structure of the shield tunnel segment joint.

[0022] Because the waterproof material is in a semi-liquid state when injected, compared with directly installing a traditional sealing gasket, there is no problem of difficult construction caused by excessive installation resistance and inaccurate positioning, and there is also no problem of easy falling off and failure of the sealing gasket under high water pressure impact or assembly stress.

[0023] Specifically, the fluorinated polyurethane prepolymer in the waterproof material provided by the application plays a role in forming a composite matrix with liquid polysulfide rubber, cross-linking to form a super-elastic network through manganese dioxide catalysis, and synergistically improving the comprehensive performance of the final cured product. Specifically, the prepolymer can cross-link with liquid polysulfide rubber under the catalysis of manganese dioxide, chemically bonding fluorine-containing segments to the entire elastomer network. This process not only enhances the mechanical strength and toughness of the cross-linked network, but more importantly, the inherent extremely low surface energy of fluorine atoms allows the surface of the cured seal to form a dense hydrophobic layer, thereby significantly improving the material's barrier ability to high water pressure and resistance to moisture and underground chemical media. At the same time, the introduction of fluorine-containing segments optimizes the microstructure of the polymer network, giving the seal a more excellent deformation recovery ability and low-temperature flexibility, ensuring long-term close adhesion of the sealing interface under complex stress and temperature changes in the tunnel. In addition, it produces a synergistic effect with the polytetrafluoroethylene micro powder in the formula, which together reduces the coefficient of friction of the material, realizes self-lubrication and water pressure self-adaptive sealing of the contact surface, and further enhances the reliability and durability of the sealing structure under dynamic changes. The functional system includes: nano calcium carbonate and hollow glass microspheres synergistically reinforce the thixotropy, dioctyl phthalate adjusts the initial rheological properties (25℃ viscosity ≤450 cP), fumed silica provides anti-sagging properties (thixotropic index ≥4.0). The interface reinforcing component uses KH-550 silane coupling agent to achieve concrete adhesion, PTFE micro powder gives the surface self-lubrication and water pressure self-adaptive sealing ability, and generates a 1.5% volume expansion through the ettringite expansion source to form a pre-compression gravitational field.

[0024] The shield tunnel segment joint waterproof material provided by the application has excellent flowability when injected and can automatically cure into a high-elastic body within a set time, thereby effectively solving the construction difficulties faced by high-precision assembled shield segments in high water pressure environments by replacing the pre-installed sealing pad with an innovative injection process.

[0025] Traditional EPDM materials are prone to compression permanent deformation after long-term compression, and the sealing force decreases, especially under the conditions of joint opening and shear deformation, it is difficult to maintain complete sealing. The sealing material used in the application has excellent performance and dynamic adaptation and self-reinforcement capability; the super-elastic flow plastic material (fluid-solid gravitational seal) used in the application is in a semi-liquid state in the initial stage, can actively fill all micro-cracks, and after curing, it changes into a high-elastic rubber-like body with excellent deformation recovery ability and dynamic sealing performance. Especially under the action of water pressure, the material forms a "self-reinforced sealing" effect due to the tight compression of the structural design, greatly improving the waterproof performance.

[0026] And the traditional sealing structure relies on the on-site installation of gaskets or weather strips by construction personnel, and has problems such as installation deviation and poor sealing. The present application integrates the sealing process with the injection operation, so that the construction personnel only need to complete the material injection operation, without the need for manual placement of sealing gaskets, greatly simplifying the construction process, improving the standardization level, saving a lot of manpower and time, and helping to reduce the dependence on manual installation and improve construction efficiency.

[0027] The existing waterproof structure often has problems such as joint misalignment and slight opening during shield segment assembly, resulting in uneven stress on the sealing gasket and weak sealing. The waterproof material provided by the present application is a super-elastic flowable material, which has good three-dimensional deformation adaptability and can automatically adjust the fitting state according to the actual deformation of the joint to realize effective contact area and ensure that the waterproof effect is not affected by assembly errors. It has strong misalignment and deformation adaptability and maintains high sealing performance.

[0028] Another object of the present application is to provide a shield tunnel segment joint waterproof structure, as shown in Figures 1-6 The side surface of each segment 1 is provided with a groove 2, and the grooves 2 on the two adjacent segments 1 are combined to form a reserved groove 3 after the two adjacent segments 1 are connected. The reserved groove 3 is filled with the shield tunnel segment joint waterproof material as described above, and the waterproof material forms a sealing body 4 after curing.

[0029] The shield tunnel segment joint waterproof structure provided by the present application sets a reserved groove 3 at the joint position of the side surface of the segment 1, and then combines the self-made shield tunnel segment joint waterproof material to inject the super-elastic flowable material with excellent fluidity into the reserved groove 3 by injection process, so that the waterproof material can fully fill the groove gap, and the flow-solid attractive sealing body, i.e. the sealing body 4, is formed after curing, thereby replacing the pre-installed sealing gasket by using the injection process, effectively solving the construction difficulty problem faced by high-precision assembly of shield segments in high water pressure environment.

[0030] As shown in Figures 7-9 The cross section of the preferred reserved groove 3 of the present application is in the shape of a gyroscope, specifically, the reserved groove 3 has a geometric shape of wide outside and narrow inside, like an inverted cone or a gyroscope, which is different from the traditional trapezoidal sealing groove and can form a more stable embedded effect in the groove.

[0031] Through the gyroscope-shaped reserved groove structure combined with the high-elastic flowable material sealing body 4 filled therein, the cross-sectional morphology of the segment joint waterproof structure formed is as shown in Figures 10-12 When the groundwater seepage enters the joint and contacts the flow-solid attractive sealing body 4, the water pressure will squeeze the material. Due to its super-elasticity, the sealing body 4 will deform, tightly fit and squeeze on the side wall of the gyroscope-shaped reserved groove 3, generating continuous contact pressure stress, thereby forming an effective sealing barrier (passive extrusion sealing).

[0032] In addition, the existing shield tunnel segment joint waterproof structure generally adopts a special-shaped groove structure such as a T-shaped groove or an M-shaped groove, the structure is complex, precise alignment installation is required in the construction process, and sealing failure is easily caused by misalignment or falling. Compared with the prior art, the scheme adopted by the present application has the advantages of simplified structure, low construction precision requirement, and improved waterproof reliability; specifically, the present application realizes automatic forming sealing by designing a gyro-shaped reserved groove 3 with a wide outer part and a narrow inner part, and cooperating with the sealing material injected in a flow state, without the need for precise alignment of the sealing gasket during assembly, thereby fundamentally avoiding installation deviation, reducing the dependence on segment processing and assembly precision, and significantly improving the reliability and consistency of the waterproof system.

[0033] In order to facilitate the injection of the waterproof material into the reserved groove 3, the present application preferably provides an injection hole 5 and an exhaust hole 6 on the segment 1, wherein the injection hole 5 and the exhaust hole 6 are communicated with the reserved groove 3, so as to facilitate the delivery of the waterproof material into the reserved groove 3 through the injection hole 5, and when the waterproof material overflows from the exhaust hole 6, it indicates that the air in the reserved groove 3 has been completely exhausted and filled with the waterproof material.

[0034] Further, the present application preferably provides a valve 7 on the exhaust hole 6, which is opened during construction, and the waterproof material is injected into the reserved groove 3 according to the method described above, and the valve 7 is closed after the injection is completed.

[0035] The present application further preferably provides that the valve 7 is a one-way check valve, which mainly prevents the backflow of medium in the pipeline system. The structure of the valve 7 is a swing type, which is internally provided with a valve flap that can rotate around the shaft. In the normal working state, the fluid flows in the normal direction, the pressure pushes the valve flap to open, and the fluid is allowed to pass. When the medium tries to flow in the reverse direction, the valve flap is automatically closed due to the pressure, thereby cutting off the reverse flow path, and finally the valve 7 is closed.

[0036] In order to further improve the waterproof effect, the present application preferably provides a support body 8 in the sealing body 4, which constitutes a topological modulus gradient support body.

[0037] The present application preferably provides that the support body 8 is prepared by injecting a support material, and the topological modulus gradient support body 8 is formed by curing the support material.

[0038] The shield tunnel segment joint waterproof structure provided by the present application has the following waterproof process: first, open the one-way check valve 7 to fill the waterproof material (fluid-solid attractive sealing body) into the joint reserved groove 3 through the injection hole 5. After the fluid-solid attractive sealing body 4 is left for a period of time, a support material is injected into the segment to fill the space between the segment and the fluid-solid attractive sealing body 4. The cross-sectional morphology of the finally formed segment joint waterproof structure is as shown in Figure 5When groundwater seepage enters the joint and contacts the fluid-solid attractive sealing body 4, the water pressure will squeeze the material. Due to its super-elastic properties, the sealing body 4 will deform, tightly fit and squeeze on the side wall of the gyro-shaped reserved groove 3, generating a continuous contact stress, thereby forming an effective sealing barrier (passive extrusion sealing). At the same time, the inside solidified topological modulus gradient support 8 plays a dual role: first, it acts as a rigid backing, preventing the super-elastic flowable material (sealing body 4) on the outside from falling off under long-term water pressure or external force; second, it exerts a continuous lateral restraining force on the sealing body 4 through its own rigidity, enhancing the contact stress of the sealing interface and achieving more reliable active waterproof effect.

[0039] Specifically, the support material preferably comprises the following components by weight: Portland cement 50-55 parts; Quick-setting activator 15-20 parts; Silica fume 5-10 parts; Nano-silicon dioxide 1-2 parts; Quicklime 0.5-1 part; Metakaolin 1-5 parts; Polypropylene fiber 0.1-1 part; EVA emulsion powder 1-2 parts; Boric acid retarder 0.1-0.5 parts; Polycarboxylic acid superplasticizer 0.1-0.5 parts.

[0040] The support material, after curing, plays an internal support role, effectively enhancing the compression stability and anti-falling ability of the super-elastic sealing material. The application preferably uses P.O 42.5R cement as the Portland cement, sodium water glass as the quick-setting activator, and modified sodium water glass (modulus 2.6 / 38°Bé) as the sodium water glass; the material uses P.O 42.5R cement as the cementing framework, modified sodium water glass (modulus 2.6 / 38°Bé) as the quick-setting activator, and silica fume and nano-silicon dioxide (KH-560 modified) to construct a dense nanostructure (porosity <8%). The volume stabilization system includes quicklime for shrinkage compensation (24h expansion rate 0.12%), metakaolin for improving ion erosion resistance (Cl⁻diffusion coefficient ≤1.5×10 -12 m² / s), and polypropylene fiber for crack resistance and reinforcement. EVA emulsion powder (Tg=-15℃) forms a modulus transition layer of 200-500MPa at the interface, boric acid retarder precisely controls the initial setting time to 45-60 minutes (matching the curing window of the elastic layer), and polycarboxylic acid superplasticizer ensures a flowability of ≥290mm.

[0041] During the construction process, after the waterproof material is injected into the reserved groove 3, a hard support material is further injected into the inside of the reserved groove 3 to form a topological modulus gradient support body.

[0042] The present application forms a "flexible plugging + rigid support" double mechanism through the sealing body 4 and the support body 8, and strengthens the high water pressure resistance; specifically, on the basis of forming a flexible sealing layer by the fluid-solid attractive sealing body, the present application secondarily injects a topological modulus gradient support body 8 into the inside of the reserved groove 3, and forms a composite sealing structure with "hard inside and elastic outside". When the external water pressure acts on the fluid-solid attractive sealing body 4, the topological modulus gradient support body 8 provides a reverse support, effectively preventing the displacement or extrusion of the sealing material.

[0043] In order to facilitate the detection of the performance of the shield tunnel segment joint waterproof structure provided by the present application, the present application provides the following examples, wherein the structural design of the waterproof structure is as shown above.

[0044] Example 1 According to the weight fraction, the A component of the waterproof material includes the following components: Liquid polysulfide rubber 38 parts; Fluorinated polyurethane prepolymer 7 parts; Silane coupling agent 2.5 parts; Fumed silica 4 parts; Hollow glass microbeads 10 parts; Nano calcium carbonate 12 parts; Polytetrafluoroethylene micro powder 1 part; Aluminate 0.5 parts; The B component includes the following components: Manganese dioxide 3.5 parts; Dioctyl phthalate 8 parts.

[0045] According to the weight fraction, the support material includes the following components: Silicate cement 52 parts; Quick-setting activator 18 parts; Silica fume 6 parts; Nano-silicon dioxide 1.5 parts; Quicklime 0.8 parts; Metakaolin 1-5 parts; Polypropylene fiber 0.1 parts; EVA latex powder 1.2 parts; Boric acid retarder 0.3 parts; Polycarboxylic acid superplasticizer 0.2 parts.

[0046] Example 2 According to the weight fraction, the A component of the waterproof material includes the following components: Liquid polysulfide rubber 30 parts; fluorinated polyurethane prepolymer 10 parts; silane coupling agent 1 part; fumed silica 3 parts; hollow glass microbead 8 parts; nano calcium carbonate 10 parts; polytetrafluoroethylene micro powder 0.5 parts; ettringite 0.1 part; The B component includes the following components: manganese dioxide 1 part; dioctyl phthalate 5 parts.

[0047] The support material includes the following components according to parts by weight: portland cement 50 parts; quick-setting accelerator 15 parts; silica fume 5 parts; nano-silica 1 part; quicklime 0.5 part; metakaolin 1-5 parts; polypropylene fiber 0.1 part; EVA latex powder 1 part; boric acid retarder 0.1 part; polycarboxylic acid superplasticizer 0.1 part.

[0048] Example 3 The A component of the waterproof material includes the following components according to parts by weight: liquid polysulfide rubber 40 parts; fluorinated polyurethane prepolymer 5 parts; silane coupling agent 5 parts; fumed silica 5 parts; hollow glass microbead 15 parts; nano calcium carbonate 15 parts; polytetrafluoroethylene micro powder 2 parts; ettringite 1 part; The B component includes the following components: manganese dioxide 5 parts; dioctyl phthalate 10 parts.

[0049] The support material includes the following components according to parts by weight: portland cement 55 parts; quick-setting accelerator 20 parts; silica fume 10 parts; nano-silica 2 parts; quicklime 1 part; metakaolin 1-5 parts; polypropylene fiber 1 part; EVA latex powder 2 parts; boric acid retarder 0.5 parts; polycarboxylic acid superplasticizer 0.5 parts.

[0050] The comparative examples in the present application are used for comparison with Example 1.

[0051] Comparative Example 1 The A component of the waterproof material includes the following components according to parts by weight: liquid polysulfide rubber 38 parts; fluorinated polyurethane prepolymer 7 parts; silane coupling agent 2.5 parts; fumed silica 4 parts; hollow glass microbeads 10 parts; nano calcium carbonate 12 parts; polytetrafluoroethylene micro powder 1 part; ettringite 0.5 parts; The B component includes the following components: manganese dioxide 3.5 parts; dioctyl phthalate 8 parts.

[0052] The support material includes the following components according to parts by weight: silicate cement 52 parts; quick-setting activator 18 parts; silica fume 6 parts; nano-silicon dioxide 1.5 parts; quicklime 0.8 parts; metakaolin 1-5 parts; polypropylene fiber 0.1 parts; boric acid retarder 0.3 parts; polycarboxylic acid superplasticizer 0.2 parts.

[0053] The difference between Comparative Example 1 and Example 1 is that EVA latex powder is not added in the support material.

[0054] Comparative Example 2 The A component of the waterproof material includes the following components according to parts by weight: liquid polysulfide rubber 38 parts; silane coupling agent 2.5 parts; fumed silica 4 parts; hollow glass microbeads 10 parts; nano calcium carbonate 12 parts; polytetrafluoroethylene micro powder 1 part; ettringite 0.5 parts; The B component includes the following components: manganese dioxide 3.5 parts; Dioctyl phthalate 8 parts.

[0055] The support material comprises the following components in parts by weight: Portland cement 52 parts; Fast setting accelerator 18 parts; Silica fume 6 parts; Nano-silica 1.5 parts; Quicklime 0.8 parts; Metakaolin 1-5 parts; Polypropylene fiber 0.1 parts; EVA emulsion powder 1.2 parts; Boric acid retarder 0.3 parts; Polycarboxylic acid superplasticizer 0.2 parts.

[0056] The difference between Comparative Example 2 and Example 1 is that the fluorinated polyurethane prepolymer is not added in the A component of the waterproof material.

[0057] In each of the examples and comparative examples, the fluorinated polyurethane prepolymer is prepared from a fluorine-containing polyether diol and a diisocyanate in a mass ratio of 100:23; the EVA emulsion powder is a commercially available EVA emulsion powder (VINNAPAS® series products of Wacker Chemical), which has a glass transition temperature ≤-15°C and a film-forming property ≥95%; the EVA emulsion powder plays a core function in the system mainly in two aspects: interface modulus transition and bonding durability enhancement: it forms a flexible transition layer with a modulus of 200-500 MPa between the cement matrix and the super-elastic sealing body, effectively buffering stress concentration and preventing peeling at the interface between rigid cement and elastic body; at the same time, it improves the flexibility and crack resistance of the cement-based material by virtue of its film-forming property, significantly improving the interface stability under long-term water pressure. It should be emphasized that the realization of the "topological modulus gradient" effect depends on the synergistic effect of multiple components: nano-silica and silica fume jointly optimize the density of the cement-based material; quicklime and polypropylene fiber synergistically compensate for shrinkage and enhance crack resistance; boric acid retarder precisely controls the setting time to match the curing window of the elastic layer. Therefore, although the EVA emulsion powder is one of the core designs for realizing the rigid-flexible interface matching, the "topological modulus gradient" property of the hard material is essentially the result of the synergistic effect of multiple components.

[0058] The performance of the waterproof material in the shield tunnel segment joint waterproof structure described above was detected, and the detection method and performance detection data of Example 1 are shown in Table 1: Table 1

[0059] The performance of the support material in the shield tunnel segment joint waterproof structure described above was detected, and the detection method and performance detection data of Example 1 are shown in Table 2: Table 2

[0060] The performance of the waterproof material in the shield tunnel segment joint waterproof structure of the above-mentioned embodiment 2, embodiment 3 and comparative example 1 and comparative example 2 is detected, the detection method and test conditions are the same as those of embodiment 1, and the performance detection data is shown in table 3: Table 3

[0061] The performance of the supporting material in the shield tunnel segment joint waterproof structure of the above-mentioned embodiment 2, embodiment 3 and comparative example 1 and comparative example 2 is detected, the detection method and test conditions are the same as those of embodiment 1, and the performance detection data is shown in table 4: Table 4

[0062] In the shield tunnel segment assembly stage, the shield tunnel segment joint waterproof structure provided by the application utilizes structural design and material performance to realize the joint waterproof function through injection + self-curing + passive pressurization without the need for manual embedding of sealing pads, solving the technical bottlenecks of installation difficulty, falling risk and high construction precision requirement of traditional sealing pads in high water pressure environment. Through the waterproof structure and construction method of the application, not only the sealing reliability and high water pressure resistance of the shield tunnel joint are improved, but also the dependence on manual precise installation is reduced, the construction process is simplified, and the application has the advantages of reasonable structure, strong adaptability, high construction efficiency and stable waterproof performance.

[0063] The shield tunnel segment joint waterproof structure provided by the application is conducive to industrialization promotion and later maintenance, and the technology discards traditional complex components such as multi-layer sealing strips and spring pads, has a simple structure, the material formula can be standardized production, the injection process can be automatically controlled, and is especially suitable for shield segment factory prefabrication and on-site rapid assembly construction system, and has good industrial application prospect. At the same time, if the joint leaks later, it can be repaired by secondary injection of supplementary materials, and has certain self-healing and maintainability.

[0064] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the application, but not to limit them; although the application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the technical solutions of the embodiments of the application.

Claims

1. A waterproof material for the joints of shield tunnel segments, characterized in that, Includes component A and component B; Component A, by weight, comprises the following components: 30-40 parts of liquid polysulfide rubber; 5-10 parts of fluorinated polyurethane prepolymer; 1-5 parts of silane coupling agent; 3-5 parts of fumed silica; 8-15 parts of hollow glass microspheres; 10-15 parts of nano-calcium carbonate; 0.5-2 parts of polytetrafluoroethylene micro powder; 0.1-1 part of ettringite; Component B includes the following components: 1-5 parts of manganese dioxide; 5-10 parts of dioctyl phthalate; The fluorinated polyurethane prepolymer is prepared from fluorinated polyether diol and diisocyanate.

2. A waterproof structure for the joints of shield tunnel segments, characterized in that, It includes at least two adjacent segments (1), each of the segments (1) has a groove (2) on its side. After the two adjacent segments (1) are connected, the grooves (2) on the two segments (1) are joined together to form a reserved groove (3). The reserved groove (3) is filled with the waterproof material for the joint of the shield tunnel segments as described in claim 1 to form a seal (4).

3. The waterproof structure for shield tunnel segment joints as described in claim 2, characterized in that, The cross-section of the reserved slot (3) is gyroscope-shaped.

4. The waterproof structure for shield tunnel segment joints as described in claim 2, characterized in that, The tube segment (1) is provided with an injection hole (5) and an exhaust hole (6), both of which are connected to the reserved groove (3).

5. The waterproof structure for shield tunnel segment joints as described in claim 4, characterized in that, A valve (7) is also provided on the vent (6).

6. The waterproof structure for shield tunnel segment joints as described in claim 5, characterized in that, The valve (7) is a one-way check valve.

7. The waterproof structure for shield tunnel segment joints as described in any one of claims 2-6, characterized in that, A support (8) is provided inside the sealing body (4).

8. The waterproof structure for shield tunnel segment joints as described in claim 7, characterized in that, The support (8) is prepared by injecting support material.

9. The waterproof structure for shield tunnel segment joints as described in claim 8, characterized in that, The support material comprises the following components in parts by weight: 50-55 parts of silicate cement; 15-20 parts of quick-setting activator; 5-10 parts silica fume; 1-2 parts of nano-silica; 0.5-1 part quicklime; 1-5 parts of metakaolin; 0.1-1 part of polypropylene fiber; 1-2 parts of EVA latex powder; Boric acid retarder 0.1-0.5 parts; 0.1-0.5 parts of polycarboxylate superplasticizer.

10. The waterproof structure for shield tunnel segment joints as described in claim 9, characterized in that, The quick-setting activator is sodium silicate.

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