Anti-seepage corrosion-resistant hydraulic tunnel structure

Abstract

The utility model relates to an anti-seepage corrosion-resistant hydraulic tunnel structure. The structure comprises a tunnel body, a speed lattice pad is arranged on the inner wall of the tunnel body, a plurality of anchoring keys are arranged on the periphery of the speed lattice pad at intervals, the anchoring keys are attached to the inner wall of the tunnel body, a plurality of fixing holes are formed in the speed lattice pad, and the speed lattice pad is fixed to the tunnel body through expansion bolts penetrating through the fixing holes; the periphery of the expansion bolt is coated with an epoxy resin coating, the end, back on to the tunnel body, of the expansion bolt sinks into the fixing hole, the portion between the fixing hole and the end of the expansion bolt is filled with an anti-corrosion layer in a coating mode, a matched supporting formwork is attached to the inner wall of the quick lattice pad, and first grouting openings are formed in the top and the bottom of the quick lattice pad. Second grouting openings are correspondingly formed in the top and the bottom of the supporting formwork, and the space between the quick lattice pad and the tunnel body is filled and injected with grouting materials through the grouting openings. A complete structure layer is formed by the lattice pad, the grouting material and the tunnel body, support is provided, and the quality and the service life of the hydraulic tunnel are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of water conservancy project design, and particularly relates to a hydraulic tunnel structure with anti-seepage and corrosion resistance. Background Art

[0002] With the rapid development of water conservancy projects, hydraulic tunnels are important underground hydraulic buildings. Hydraulic tunnels are usually buried underground, highly concealed during construction and support processes, with more complex surrounding hydrogeological conditions than surface projects. At the same time, some hydraulic tunnels have to be arranged in collapsible loess areas.

[0003] In the prior art, for the tunnel body of a hydraulic tunnel, it is used to bear the pressure of water flow and the load of soil mass, and generally a concrete material is set on the inner side of the tunnel body as a lining to enhance the stability and anti-seepage performance of the structure. However, in the actual construction process of hydraulic tunnels, due to the uneven construction technology of construction units and the problem of not strictly constructing according to the standard design, many defects often appear during the construction period and operation period of hydraulic tunnels, such as lining cracks, cavities behind the lining, insufficient lining thickness, water leakage, tunnel freezing damage and other lining quality defects.

[0004] Meanwhile, the lining constructed with concrete material has poor flexibility and ductility itself, and is also prone to defects such as cracks due to stress deformation during the operation period, affecting the use safety.

[0005] If the above quality defects exist after the completion of a hydraulic tunnel, it will inevitably deteriorate the stress of the lining structure, leading to adverse conditions such as stress concentration and excessive deformation of the lining structure, shortening the service life of the hydraulic tunnel, greatly increasing the maintenance cost after operation, and even causing the collapse of the hydraulic tunnel in severe cases, resulting in significant economic losses and even casualties.

[0006] Therefore, how to ensure the quality of hydraulic tunnels and improve the anti-seepage and corrosion resistance of hydraulic tunnels is a technical problem that needs to be solved urgently by those skilled in the art. Content of the Utility Model

[0007] The technical problem to be solved by the utility model is to provide a hydraulic tunnel structure with anti-seepage and corrosion resistance. By forming a complete structural layer with a geogrid, grouting material and tunnel body to provide support, the quality and service life of the hydraulic tunnel are ensured.

[0008] In response to the above technical problem, the technical solution provided by the utility model is a hydraulic tunnel structure with anti-seepage and corrosion resistance, including a tunnel body. A geogrid is arranged on the inner wall of the tunnel body. A plurality of anchoring keys are arranged at intervals on the outer periphery of the geogrid. The anchoring keys are attached to the inner wall of the tunnel body. A plurality of fixing holes are arranged on the geogrid. The geogrid is fixed on the tunnel body through expansion bolts passing through the fixing holes;

[0009] The outer periphery of the expansion bolt is coated with an epoxy resin coating. The end of the expansion bolt facing away from the tunnel main body sinks into the fixing hole, and an anti-corrosion layer is coated and filled between the fixing hole and this end of the expansion bolt. A suitable support formwork is attached to the inner wall of the Sika mat. First grouting ports are provided at both the top and bottom of the Sika mat. Second grouting ports are respectively provided at the positions corresponding to the first grouting ports at the top and bottom of the support formwork. Grouting material is filled and injected between the Sika mat and the tunnel main body through the first grouting ports and the second grouting ports.

[0010] Further, the thickness of the grouting material is not less than the height of the anchoring key.

[0011] Further, the anchoring key is a Y-shaped key, and the fork of the Y-shaped key faces the tunnel main body.

[0012] Further, the support formwork is an inflatable trolley formwork.

[0013] Further, a plurality of the first grouting ports are arranged at intervals along the length direction of the tunnel main body.

[0014] Further, a plurality of Sika mats are arranged along the length direction of the tunnel main body, and adjacent Sika mats are welded by high-temperature hot melting.

[0015] Further, double-weld seams are used for welding between adjacent Sika mats.

[0016] Further, the tunnel main body includes a tunnel body, and a concrete shotcrete layer with wire mesh and a reinforced concrete lining are sequentially arranged on the inner wall of the tunnel body from outside to inside, and the inner wall of the reinforced concrete lining is the inner wall of the tunnel main body.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] By arranging a Sika mat in the tunnel main body and pouring and filling grouting material between the Sika mat and the tunnel main body, a complete structural layer can be formed by the Sika mat, the grouting material and the inner wall of the tunnel main body, which plays a supporting role for the tunnel main body. At the same time, by using the characteristics of the Sika mat such as good flexibility, high ductility, corrosion resistance, high strength and good rigidity, the stress concentration of the lining structure of the tunnel main body caused by the stress deformation of the tunnel main body structure is avoided, meeting the requirements of anti-seepage and corrosion resistance of the hydraulic tunnel structure, ensuring the service life. The Sika mat surrounds the inner wall of the tunnel main body in a circle as a whole, having good integrity, and avoiding problems such as leakage, cracks, rupture, disconnection, corrosion, etc. on the inner wall of the hydraulic tunnel during use.

[0019] The expansion bolts can be used to reliably fix the Sika mat to the tunnel main body, facilitating the subsequent pouring of grouting material. By coating the outer periphery of the expansion bolts with an epoxy resin coating, the corrosion resistance of the expansion bolts can be improved. By sinking the expansion bolts into the fixing holes, a sunk groove can be formed at the end of the fixing hole and the expansion bolts. By filling an anti-corrosion layer in the sunk groove, on the one hand, the expansion bolts can be sealed to avoid leakage, and on the other hand, the corrosion resistance can be enhanced, improving the overall corrosion resistance and anti-leakage ability of the hydraulic tunnel structure.

[0020] The support formwork can be used to maintain the shape of the Sika mat when pouring the grouting material, so that the outer end of the Sika mat is attached to the inner wall of the tunnel main body. By using the first grouting port and the second grouting port, the pouring quality of the grouting material can be ensured between the Sika mat and the inner wall of the tunnel main body, ensuring the overall quality of the hydraulic tunnel structure. Brief Description of the Drawings

[0021] Figure 1 It is a front sectional view of the hydraulic tunnel structure in Embodiment 1 of the present utility model.

[0022] Figure 2 is Figure 1 The enlarged view of part A in

[0023] Figure 3 is Figure 1 The enlarged view of part B in

[0024] Figure 4 It is a side sectional view of the hydraulic tunnel structure in Embodiment 1 of the present utility model.

[0025] In the figure: 1, tunnel body; 2, concrete shotcrete layer with wire mesh; 3, reinforced concrete lining; 4, expansion bolt; 5, grouting material; 6, Sika mat; 61, anchoring key; 7, first grouting port; 8, second grouting port; 9, pneumatic trolley formwork; 10, weld; 11, fixing hole; 12, anti-corrosion layer; 13, tunnel main body. Detailed Description of the Invention

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application: Specific Embodiment 1:

[0028] Refer to Figures 1 to 4 , a leak-proof and corrosion-resistant hydraulic tunnel structure (hereinafter referred to as the hydraulic tunnel structure) of the present utility model includes a tunnel main body 13, and a Sika mat 6 is arranged on the inner wall of the tunnel main body 13. As shown in Figure 1As shown, the cross-sectional shape of the quick grid mat 6 is adapted to the cross-sectional shape of the inner wall of the tunnel main body 13. The quick grid mat 6 is arranged in a closed loop around the inner wall of the tunnel main body 13 to form a closed support space. A plurality of anchoring keys 61 are arranged at intervals on the outer periphery of the quick grid mat 6. The anchoring keys 61 are attached to the inner wall of the tunnel main body 13. A plurality of fixing holes 11 are provided on the quick grid mat 6. The quick grid mat 6 is fixed to the tunnel main body 13 by expansion bolts 4 passing through the fixing holes 11.

[0029] Specifically, in this embodiment, the outer periphery of the expansion bolt 4 is coated with an epoxy resin coating. As Figure 3 shown, the end of the expansion bolt 4 facing away from the tunnel main body 13 sinks into the fixing hole 11, so that a sinking groove is formed between the end of the expansion bolt 4 and the fixing hole 11. An anti-corrosion layer 12 is coated and filled in the sinking groove. In this embodiment, the anti-corrosion layer 12 can be made of epoxy resin material or polyurethane coating, and can be specifically selected according to actual needs.

[0030] This setting can reliably fix the quick grid mat 6 and the tunnel main body 13 together by using the expansion bolts 4, which is convenient for subsequent pouring of grouting material 5. By coating the outer periphery of the expansion bolts 4 with an epoxy resin coating, the corrosion resistance of the expansion bolts 4 can be improved. By sinking the expansion bolts 4 into the fixing holes 11, a sinking groove can be formed between the fixing holes 11 and the ends of the expansion bolts 4. By filling the anti-corrosion layer 12 in the sinking groove, on the one hand, the expansion bolts 4 can be sealed to avoid leakage, and on the other hand, the corrosion resistance can be enhanced, improving the overall corrosion resistance and anti-leakage ability of the hydraulic tunnel structure.

[0031] In this embodiment, as Figure 1 , 3 shown, a suitable support formwork is attached to the inner wall of the quick grid mat 6. First grouting ports 7 are provided at both the top and the bottom of the quick grid mat 6. Second grouting ports 8 are respectively provided at the positions corresponding to the first grouting ports 7 at the top and the bottom of the support formwork. The grouting material 5 is filled and injected between the quick grid mat 6 and the tunnel main body 13 through the first grouting ports 7 and the second grouting ports 8.

[0032] By setting up in this way, that is, by arranging the grid mat 6 inside the tunnel main body 13 and pouring and filling grouting material 5 between the grid mat 6 and the tunnel main body 13, a complete structural layer can be formed by the grid mat 6, the grouting material 5 and the inner wall of the tunnel main body 13, which plays a supporting role for the tunnel main body 13. Utilizing the characteristics of the grid mat 6 such as good flexibility, high ductility, corrosion resistance, high strength and good rigidity, the requirements of anti-seepage and corrosion resistance of the hydraulic tunnel structure are met. The grid mat 6 entirely surrounds the inner wall of the tunnel main body 13 for one week, having good integrity, and avoiding problems such as leakage, cracks, ruptures, disconnections, and corrosion on the inner wall of the hydraulic tunnel during use. By using the support formwork, the shape of the grid mat 6 can be maintained when pouring the grouting material 5, so that the outer end of the grid mat 6 is attached to the inner wall of the tunnel main body 13. By using the first grouting port 7 and the second grouting port 8, the pouring quality of the grouting material 5 can be ensured between the grid mat 6 and the inner wall of the tunnel main body 13 where the grouting material 5 is evenly filled, and the overall quality of the hydraulic tunnel structure is guaranteed.

[0033] Moreover, for the hydraulic tunnel structure of the present application, no surface excavation is required during the construction process, the construction is simple, the engineering quantity is small, and the construction speed is fast. The grid mat 6 provides a high-quality solution for the long-term protection of the concrete structure.

[0034] Preferably, in this embodiment, as Figure 1 shown, the tunnel main body 13 includes the outermost tunnel body 1, and the inner wall of the tunnel body 1 is successively provided with a concrete shotcrete layer with wire mesh 2 and a reinforced concrete lining 3 from the outside to the inside, and the inner wall of the reinforced concrete lining 3 is the inner wall of the tunnel main body 13. The anchoring key 61 is a V-shaped key, and the opening of the V-shaped key faces the tunnel main body 13. By using the V-shaped anchoring key 61, the grid mat 6 and the grouting material 5 can be firmly combined together, improving the overall support strength and not being easily detached.

[0035] In this embodiment, preferably, as Figure 4 shown, a plurality of grid mats 6 are successively arranged along the length direction of the tunnel main body 13, and adjacent grid mats 6 are welded by high-temperature hot melting. And the adjacent grid mats 6 are welded in a double-weld way. That is, a weld 10 is respectively arranged on the inner and outer layers of the grid mat 6, and two welds 10 are formed through double-layer welding, which can enhance the welding strength and reliability. The double-weld welding can provide better load distribution and performance.

[0036] In this embodiment, a plurality of first grouting ports 7 are arranged at intervals along the length direction of the tunnel main body 13. Specifically, a group of first grouting ports 7 are arranged on each grid mat 6. In this way, by moving the support formwork to carry out grouting at different positions, the uniformity and compactness of the grouting material 5 can be improved, and the quality can be improved. Of course, in other embodiments, the number and interval of the first grouting ports 7 can be set according to actual needs.

[0037] In this embodiment, the supporting formwork is an inflatable trolley formwork 9. In this way, the quick grid mat 6 can be supported by inflation, reducing the handling difficulty. Moreover, the inflatable trolley formwork 9 is relatively light, easy to handle and install, improving the construction speed and work efficiency. And after being inflated inside, it forms a strong supporting structure, which can adapt to the curve or irregular shape of the tunnel, enabling the quick grid mat 6 to be supported everywhere and ensuring the quality of the final hydraulic tunnel structure.

[0038] Specifically, in this embodiment, the thickness of the grouting material 5 is not less than the height of the anchoring key 61. In this way, the grouting material 5 can completely fill the gap between the quick grid mat 6 and the tunnel main body 13, ensuring the compactness and avoiding the existence of cavities.

[0039] The construction process of this application: First, clean the inner wall of the tunnel main body 13, and then use detection equipment to inspect and record the inner wall of the tunnel main body 13 to detect whether the tunnel main body 13 meets the construction conditions.

[0040] During construction, first, the quick grid mat 6 is fabricated according to the design drawings, and the quick grid mat 6 is subjected to high-temperature hot-melt welding using an automatic welding machine. At the same time, the welding temperature is determined according to factors such as the material of the quick grid mat 6 and the temperature. The welding is made into a double weld seam 10, and the overlapping width of the double weld seam 10 should meet the specification requirements. The specific specification requirements are common knowledge in this field and will not be elaborated here. First grouting ports 7 are respectively reserved at the top and bottom of the quick grid mat 6.

[0041] The quick grid mat 6 is pulled into the inner wall of the reinforced concrete lining 3. The quick grid mat 6 entering the tunnel main body 13 should be kept flat and not distorted. The quick grid mat 6 is fixed by expansion bolts 4, and then it is made to fit with the to-be-constructed reinforced concrete lining 3 by means of supporting the inflatable trolley formwork 9, and the second grouting port 8 on the inflatable trolley formwork 9 is aligned with the corresponding first grouting port 7 on the quick grid mat 6, so that a closed space is formed between the quick grid mat 6 and the inner wall of the to-be-constructed tunnel main body 13 through the inflatable trolley formwork 9.

[0042] The grouting material 5 is injected into the space between the quick grid mat 6 and the reinforced concrete lining 3 from the first grouting port 7 and the second grouting port 8, so that the grouting material 5 fills the gap between the quick grid mat 6 and the reinforced concrete lining 3, thereby making the quick grid mat 6 and the tunnel main body 13 form an integral whole. In this embodiment, the grouting volume per square meter is not less than 50 kg. The grouting material 5 is prepared using a special mixer during production. The grouting pressure needs to meet the specification requirements.

[0043] After the grouting is completed, it is necessary to perform back grouting and closing grouting on the hydraulic tunnel structure. Before grouting, it should be checked that the inner wall of the tunnel main body 13 is kept in a wet state to facilitate the flow of the grouting material 5.

[0044] According to the engineering requirements, self-flow filling grouting, mechanical pressure or gravity grouting can be adopted. The grouting material 5 and water are proportioned according to the material instructions, and mechanical mixing is preferably used. During the grouting process, grouting should be carried out quickly and continuously to make the grouting dense. The grouting material 5 can be high mortar, etc.

[0045] After the grouting material 5 is cured, the formwork 9 of the inflatable trolley is removed, and the constructed hydraulic tunnel is inspected and accepted. On the one hand, special inspection instruments for hydraulic tunnels are used to detect the construction conditions of the internal lining, and on the other hand, functional inspection tests are carried out according to the relevant specifications of the hydraulic tunnel.

[0046] The removal time of the formwork 9 of the inflatable trolley should be determined according to the setting time of the grouting material 5 test block on site. The grouting material 5 test block and the inner lining pipe should be in the same environment. When the setting strength of the grouting material 5 test block does not reach the groundwater pressure, the formwork 9 of the inflatable trolley cannot be removed. After removing the formwork 9 of the inflatable trolley, end treatment is carried out, and the cut at the end of the first grouting port 7 is flat. The minimum required thickness of the geogrid 6 and the grouting material 5 should meet the specification requirements.

[0047] After the inspection and acceptance of the structure of the constructed hydraulic tunnel is qualified, an anti-corrosion layer 12 is coated in the sink formed by the expansion bolt 4 and the fixing hole 11, and the thickness meets the specification requirements.

[0048] Embodiment 2: This embodiment provides a different anchoring key. Different from Embodiment 1, in this embodiment, when meeting the actual use requirements, the anchoring key can also be a Y-shaped key, and the fork of the Y-shaped key is arranged towards the tunnel main body, and the Y-shaped key is used to improve the grasping ability between the geogrid and the grouting material.

[0049] Embodiment 3: This embodiment provides a different anchoring key. Different from Embodiment 1, in this embodiment, when meeting the actual use requirements, single-weld seams can be used for welding between adjacent geogrids, and the lap width of the single-weld seams should meet the specification requirements.

[0050] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

[0051] In the description of the embodiments of the present application, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is usually placed during use. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0052] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

Claims

1. A leak-proof and corrosion-resistant hydraulic tunnel structure, characterized in that It includes a tunnel main body, where a grid mat is arranged on the inner wall of the tunnel main body. A plurality of anchoring keys are arranged at intervals on the outer periphery of the grid mat. The anchoring keys are attached to the inner wall of the tunnel main body. A plurality of fixing holes are arranged on the grid mat, and the grid mat is fixed on the tunnel main body by expansion bolts passing through the fixing holes; An epoxy resin coating is applied to the outer periphery of the expansion bolt. The end of the expansion bolt facing away from the tunnel main body sinks into the fixing hole, and an anti-corrosion layer is coated and filled between the fixing hole and this end of the expansion bolt. A matching support formwork is attached to the inner wall of the grid mat. First grouting ports are arranged at the top and bottom of the grid mat respectively. Second grouting ports are respectively arranged at the positions corresponding to the first grouting ports at the top and bottom of the support formwork. Grouting material is filled and injected between the grid mat and the tunnel main body through the first grouting ports and the second grouting ports.

2. The anti-leakage and corrosion-resistant hydraulic tunnel structure according to claim 1, wherein The thickness of the grouting material is not less than the height of the anchoring key.

3. The anti-seepage and corrosion-resistant hydraulic tunnel structure according to claim 1, characterized in that, The anchoring key is a Y-shaped key, and the fork of the Y-shaped key faces the tunnel main body.

4. The anti-seepage and corrosion-resistant hydraulic tunnel structure according to claim 1, wherein The support formwork is an inflatable trolley formwork.

5. The anti-seepage and corrosion-resistant hydraulic tunnel structure according to claim 1, wherein, A plurality of the first grouting ports are arranged at intervals along the length direction of the tunnel main body.

6. The anti-seepage and corrosion-resistant hydraulic tunnel structure according to claim 1, wherein A plurality of the grid mats are arranged in sequence along the length direction of the tunnel main body, and adjacent grid mats are welded by high-temperature hot melting.

7. The anti-seepage and corrosion-resistant hydraulic tunnel structure according to claim 6, characterized in that, Double-weld seams are used for welding between adjacent grid mats.

8. The anti-seepage and corrosion-resistant hydraulic tunnel structure according to claim 1, characterized in that, The tunnel main body includes a tunnel body. The inner wall of the tunnel body is successively provided with a concrete shotcrete layer with wire mesh and a reinforced concrete lining from outside to inside. The inner wall of the reinforced concrete lining is the inner wall of the tunnel main body.

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