Wide-seam water-stopping pressure-bearing structure for high-pressure hydraulic tunnel

Abstract

The utility model discloses a wide seam waterstop pressure-bearing structure for a high-pressure hydraulic tunnel in the field of hydraulic engineering, which comprises a spraying layer and a lining which are sequentially arranged on the inner wall of the tunnel, a plurality of prefabricated wide seams are arranged on the lining at intervals along the circumferential direction of the lining, and waterstop structures are arranged in the prefabricated wide seams. The water stop structure comprises a composite elastic water stop layer and a pre-embedded water stop copper sheet, the prefabricated wide seam is filled with the composite elastic water stop layer, the pre-embedded water stop copper sheet is arranged in the prefabricated wide seam, the pre-embedded water stop copper sheet penetrates through the two ends of the whole prefabricated wide seam in the length direction, and the two sides of the pre-embedded water stop copper sheet are embedded into linings on the two sides of the prefabricated wide seam respectively. The composite elastic water stop layer and the pre-embedded water stop copper sheet are arranged, the composite elastic water stop layer is used for adapting to annular change of the prefabricated wide seam, the pre-embedded water stop copper sheet is used for resisting water pressure on the inner side and the outer side of the lining, the composite elastic water stop layer is prevented from being directly torn by high water pressure, and an excellent anti-seepage effect is achieved; and the reliability of the water stop capability of the concrete lining structure of the high-pressure hydraulic tunnel is improved.

Description

Technical Field

[0001] The utility model relates to the field of water conservancy projects, in particular to a wide-slit water-stopping pressure-bearing structure used for a high-pressure hydraulic tunnel. Background Art

[0002] With the rapid development of my country's economy, my country's demand for hydropower resources is increasing. In order to alleviate this problem, China has built a large number of western hydropower projects and inter-basin water diversion projects in recent years. The construction of these projects has promoted the development of high-pressure hydraulic tunnels, which often bring high internal and external water pressure problems, causing cracks in high-pressure hydraulic tunnels. To solve this problem, some high-pressure hydraulic tunnels are equipped with prefabricated wide seams on the concrete lining and filled with water-stopping materials in the prefabricated wide seams to enable the high-pressure hydraulic tunnels to expand outward or contract inward to adapt to the changes in internal and external water pressure. However, when the high-pressure hydraulic tunnel is subjected to large internal and external water pressure, the water-stop sheet or water-stop belt in the prefabricated wide seam is easily damaged by the water pressure. At the same time, the circumferential deformation of the lining and the excessive opening of the reserved seam lead to the destruction of the lining structure. Therefore, the water-stopping structure design of the reserved wide seam of the concrete lining becomes very important. At present, the main water-stopping methods for reserved joints in concrete lining of tunnels are: copper water-stop plates and rubber water-stop strips. This method allows the lining concrete to form a closed anti-leakage body with the two, but it is easily affected by the construction quality. The water-stopping effect is not good after commissioning, and the pressure-bearing capacity is poor, which causes the lining structure to be damaged and affects the overall structural safety of the tunnel. Utility Model Content

[0003] In order to overcome the shortcomings of existing water-stopping methods that are easily torn and damaged in high-pressure hydraulic tunnels, the technical problem to be solved by the utility model is to provide a wide-slit water-stopping pressure-bearing structure for high-pressure hydraulic tunnels with a more stable structure.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A wide-slit water-stopping pressure-bearing structure for a high-pressure hydraulic tunnel comprises a sprayed layer and a lining sequentially arranged on the inner wall of the tunnel, wherein the lining is provided with a plurality of prefabricated wide slots at intervals along its circumference, and a water-stopping structure is arranged in the prefabricated wide slot, wherein the water-stopping structure comprises a composite elastic water-stopping layer filled in the prefabricated wide slot, and a pre-embedded water-stopping copper sheet arranged in the prefabricated wide slot, wherein the pre-embedded water-stopping copper sheet runs through both ends of the entire length direction of the prefabricated wide slot, and the two sides of the pre-embedded water-stopping copper sheet are respectively embedded in the lining on both sides of the prefabricated wide slot.

[0006] Furthermore, the pre-buried water-stopping copper sheets include at least two sheets, which are spaced apart along the depth direction of the prefabricated wide seam.

[0007] Furthermore, the pre-embedded water-stopping copper sheets include two, and the two pre-embedded water-stopping copper sheets are respectively arranged at a position 1 / 3-1 / 4 of the depth from the inner and outer sides of the lining.

[0008] Furthermore, water stop grooves are provided at positions on the inner and outer sides of the lining corresponding to the prefabricated wide seams, and water stop copper sheets are laid in the water stop grooves and filled with tough fluorosilicone resin.

[0009] Furthermore, the water-stop copper sheet includes at least two layers, the water-stop copper sheet is located in the middle of the water-stop groove, and the cross-section of the water-stop copper sheet is curved, so that its two sides respectively abut against the two side walls of the water-stop groove under its own elastic force.

[0010] The beneficial effects of the utility model are as follows: by arranging a composite elastic water-stop layer and a pre-embedded water-stop copper sheet in the prefabricated wide seam, the composite elastic water-stop layer can adapt to the circumferential change of the prefabricated wide seam, and the pre-embedded water-stop copper sheet can resist the water pressure inside and outside the lining, avoiding high water pressure from directly tearing the composite elastic water-stop layer, having an excellent anti-leakage effect, and improving the reliability of the water-stopping ability of the concrete lining structure of the high-pressure hydraulic tunnel; by arranging water-stop grooves at positions corresponding to the prefabricated wide seams on the inside and outside of the lining, and arranging water-stop copper sheets and tough fluorosilicone resin in the water-stop grooves, a multi-channel water-stop structure can be formed, which can better resist internal and external water pressures and greatly improve the safety of the lining structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 It is a cross-sectional schematic diagram of a high-pressure hydraulic tunnel of the utility model.

[0013] Marked in the figure are, 1-sprayed layer, 2-lining, 3-composite elastic water-stop layer, 4-embedded water-stop copper sheet, 5-water-stop copper sheet, 6-tough fluorosilicone resin, 21-prefabricated wide seam, 22-water-stop groove. DETAILED DESCRIPTION

[0014] The utility model is further described below in conjunction with the accompanying drawings.

[0015] It should be noted that if there are directional indication terms in the present invention, such as up, down, left, right, front, and back directions and orientation terms, they are for the purpose of facilitating the description of the relative position relationship between components, and are not for the absolute position of the related components or the position relationship between components. They are only used to explain the relative position relationship and movement of the components in a certain posture. If the specific posture changes, the directional indication will also change accordingly. If there are terms related to quantity in the present invention, such as "multiple", "multiple", "several", etc., they specifically refer to two or more.

[0016] like Figure 1 , Figure 2 As shown, the utility model is a wide-slit water-stopping pressure-bearing structure for high-pressure hydraulic tunnels, comprising a sprayed layer 1 and a lining 2 sequentially arranged on the inner wall of the tunnel, wherein the lining 2 is provided with a plurality of prefabricated wide slots 21 at intervals along its circumference, and a water-stopping structure is provided in the prefabricated wide slot 21, wherein the water-stopping structure comprises a composite elastic water-stopping layer 3 filled in the prefabricated wide slot 21, and a pre-embedded water-stopping copper sheet 4 arranged in the prefabricated wide slot 21, wherein the pre-embedded water-stopping copper sheet 4 runs through both ends of the entire prefabricated wide slot 21 in the length direction, and the two sides of the pre-embedded water-stopping copper sheet 4 are respectively embedded in the lining 2 on both sides of the prefabricated wide slot 21.

[0017] The structure of the entire tunnel is as follows Figure 2 As shown, the lining 2 is divided into multiple arc sections by multiple prefabricated wide seams 21 arranged at intervals along the circumference of the tunnel, and the water-stop structure is arranged in the prefabricated wide seams 21 to ensure that the entire lining 2 can deform circumferentially while playing a water-stopping and sealing role. The composite elastic water-stop layer 3 is an existing material. Compared with ordinary water-stop strips, it has a certain elasticity and viscosity, and can firmly fill and bond in the prefabricated wide seams 21 of the two linings 2, thereby playing a sealing effect. The lining 2 is also divided into multiple sections for casting along the length direction of the tunnel, so the length of the prefabricated wide seam 21 and the length of the embedded water-stop copper sheet 4 are consistent with the length of each section of the lining 2. The embedded water-stop copper sheet 4 itself has a certain elasticity and will not affect the deformation of the prefabricated wide seam 21. At the same time, its two sides penetrate into the lining 2, which can play a role in blocking the internal and external water pressure, and avoid the high internal and external water pressure directly acting on the composite elastic water-stop layer 3, forming a through tear, resulting in sealing failure. Therefore, the water-stopping structure of the utility model has an excellent anti-leakage effect and improves the reliability of the water-stopping ability of the concrete lining structure of the high-pressure hydraulic tunnel.

[0018] The lining 2 of the current high-pressure hydraulic tunnel is generally thicker. In order to increase the water-stopping effect, the pre-embedded water-stopping copper sheets 4 preferably include at least two, and are spaced apart along the depth direction of the prefabricated wide seam 21. Among them, the preferred scheme is that the pre-embedded water-stopping copper sheets 4 include two, and the two pre-embedded water-stopping copper sheets 4 are respectively arranged at the positions of 1 / 3-1 / 4 depth from the inner and outer sides of the lining 2, that is, one pre-embedded water-stopping copper sheet 4 is arranged at 1 / 3-1 / 4 depth from the inner side of the lining 2, and the other is arranged at 1 / 3-1 / 4 depth from the outer side of the lining 2. The two pre-embedded water-stopping copper sheets 4 are preferably arranged symmetrically.

[0019] Furthermore, water stop grooves 22 are provided at positions on the inner and outer sides of the lining 2 corresponding to the prefabricated wide seam 21, and water stop copper sheets 5 are laid in the water stop grooves 22 and filled with tough fluorosilicone resin 6. The length of the water stop groove 22 needs to be consistent with the length of the prefabricated wide seam 21, and the depth and width of the water stop groove 22 are designed according to the actual project conditions. Tough fluorosilicone resin 6 is also an existing material, which is used to fix the water stop copper sheet 5 in the water stop groove 22 on the one hand, and has good toughness on the other hand, can adapt to the deformation of the prefabricated wide seam 21, and has strong tear resistance. The water stop copper sheet 5 and tough fluorosilicone resin 6 in the water stop groove 22 can form a multi-channel water stop structure with the composite elastic water stop layer 3 and the embedded water stop copper sheet 4, so as to better resist internal and external water pressure, greatly improving the safety of the lining structure.

[0020] The preferred solution is that the water-stop copper sheet 5 includes at least two layers, the water-stop copper sheet 5 is located in the middle of the water-stop groove 22, and the cross section of the water-stop copper sheet 5 is curved, so that its two sides respectively abut against the two side walls of the water-stop groove 22 under its own elastic force. The water-stop copper sheet 5 is fixed in the middle of the water-stop groove 22 by using the tough fluorosilicone resin 6 on both sides, which can increase the stability of the installation of the water-stop copper sheet 5. During design, the width of the water-stop copper sheet 5 can be made slightly larger than the width of the water-stop groove 22. After installation, the water-stop copper sheet 5 is bent and abuts between the two side walls of the water-stop groove 22. On the one hand, it can adapt to the curvature of the lining 2, and on the other hand, it enables the water-stop copper sheet 5 to change with the circumferential deformation of the lining 2, further improving the water-stopping effect.

[0021] To sum up, the utility model arranges a composite elastic water-stop layer 3 and a pre-embedded water-stop copper sheet 4 in the prefabricated wide seam 21, the composite elastic water-stop layer 3 can adapt to the circumferential change of the prefabricated wide seam 21, the pre-embedded water-stop copper sheet 4 can resist the water pressure inside and outside the lining 2, and avoids high water pressure directly tearing the composite elastic water-stop layer 3, has excellent anti-leakage effect, and improves the reliability of the water-stopping ability of the concrete lining structure of the high-pressure hydraulic tunnel; by arranging a water-stop groove 22 at a position corresponding to the prefabricated wide seam 21 on the inner and outer sides of the lining 2, and arranging a water-stop copper sheet 5 and a tough fluorosilicone resin 6 in the water-stop groove 22, a multi-channel water-stop structure can be formed, which can better resist internal and external water pressures and greatly improve the safety of the lining structure, and therefore has good practicality and application value.

Claims

1. A wide seam water-stopping pressure-bearing structure for a high-pressure hydraulic tunnel, comprising a sprayed layer (1) and a lining (2) sequentially arranged on the inner wall of the tunnel, wherein the lining (2) is provided with a plurality of prefabricated wide seams (21) at intervals along its circumference, and a water-stopping structure is provided in the prefabricated wide seams (21), characterized in that: The water-stop structure comprises a composite elastic water-stop layer (3) filled in the prefabricated wide seam (21), and a pre-buried water-stop copper sheet (4) arranged in the prefabricated wide seam (21), wherein the pre-buried water-stop copper sheet (4) runs through both ends of the entire length direction of the prefabricated wide seam (21), and both sides of the pre-buried water-stop copper sheet (4) are respectively embedded in the lining (2) on both sides of the prefabricated wide seam (21).

2. The wide seam water-stopping pressure-bearing structure for high-pressure hydraulic tunnel according to claim 1, characterized in that: The pre-buried water-stopping copper sheets (4) include at least two sheets, which are arranged at intervals along the depth direction of the prefabricated wide seam (21).

3. The wide seam water-stopping pressure-bearing structure for high-pressure hydraulic tunnel according to claim 2, characterized in that: The pre-buried water-stopping copper sheets (4) include two sheets, and the two pre-buried water-stopping copper sheets (4) are respectively arranged at positions 1 / 3 to 1 / 4 of the depth from the inner and outer sides of the lining (2).

4. The wide seam water-stopping pressure-bearing structure for high-pressure hydraulic tunnels according to claim 1, 2 or 3, characterized in that: Water stop grooves (22) are provided at positions on the inner and outer sides of the lining (2) corresponding to the prefabricated wide seams (21), and the water stop grooves (22) are paved with water stop copper sheets (5) and filled with tough fluorosilicone resin (6).

5. The wide seam water-stopping pressure-bearing structure for high-pressure hydraulic tunnel according to claim 4, characterized in that: The water-stop copper sheet (5) comprises at least two layers. The water-stop copper sheet (5) is located in the middle of the water-stop groove (22). The cross section of the water-stop copper sheet (5) is curved so that two sides thereof respectively abut against the two side walls of the water-stop groove (22) under their own elastic force.

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