Sealing structure for gas storage tunnel
By using a combined structure of polyurea layer and concrete leveling layer in the gas storage tunnel, the problem of traditional lining structures being prone to cracking under high pressure is solved, the sealing and stability are improved, and construction costs and construction periods are reduced.
Patent Information
- Application Number
- CN202422695848.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-05
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-11-05
AI Technical Summary
Traditional tunnel lining structures are prone to cracking or deforming in high-pressure gas environments, resulting in gas leakage, and the prior art is difficult to achieve efficient sealing under economical and reasonable premise.
The combined structure of polyurea layer and concrete leveling layer is adopted. The polyurea layer is sprayed on the surrounding rock of the cave wall, and the concrete leveling layer is set on the polyurea layer, and spliced through X-shaped bevel and movable slides are sealed with the anti-seepage layer.
The stability and anti-seepage of the sealing structure under high pressure environment is achieved, the polyurea layer is prevented from breaking away from the hole wall, adapting to internal and external pressure deformation, simple construction, low cost and short construction period.
Smart Images
Figure CN223215274U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of underground energy storage, in particular to a sealing structure for a gas storage tunnel. Background Art
[0002] Energy storage technology is an important field that all countries are competing to develop and has a special strategic position. Among them, compressed air energy storage technology is regarded as another large-scale energy storage technology with great potential besides pumped storage, and it has broad development prospects. For compressed air energy storage in underground hard caverns, one of the research difficulties lies in the sealing of the underground caverns. Initially, steel plate lining was mostly used in the project, but the cost was high. For this reason, the industry proposed the idea of using lining structures for support and sealing, with the aim of achieving high-pressure gas sealing with reasonable economic investment. However, traditional tunnel lining structures are prone to cracking or deformation due to internal air pressure or external pressure water, leading to gas leakage. Utility Model Content
[0003] In order to overcome the above-mentioned deficiencies of the existing energy storage cavern lining, the technical problem to be solved by the present invention is to provide a sealing structure for a gas storage tunnel that can adapt to internal and external pressures.
[0004] The technical solution adopted by the utility model to solve its technical problems is:
[0005] The sealing structure for a gas storage tunnel comprises a lining structure arranged on the tunnel wall surrounding rock, the lining structure comprising a polyurea layer and a concrete leveling layer, the polyurea layer is sprayed on the tunnel wall surrounding rock, and the concrete leveling layer is arranged on the polyurea layer.
[0006] Furthermore, the thickness of the polyurea layer is not less than 2 cm.
[0007] Furthermore, the concrete leveling layer is a reinforced concrete structure, the inner wall of the concrete leveling layer is flat and smooth, and the cross section is circular.
[0008] Furthermore, the concrete leveling layer is a segmented spraying structure, and the splicing ends of two adjacent segments of the concrete leveling layer are provided with an X-shaped groove, and an X-shaped caulking movable slider with a cross-section adapted to the X-shaped groove is provided in the X-shaped groove.
[0009] Furthermore, the elastic modulus of the movable caulking slider is smaller than the elastic modulus of the concrete leveling layer.
[0010] Furthermore, the inner surface of the concrete leveling layer is coated with an anti-seepage layer.
[0011] The beneficial effects of the utility model are as follows: the high-molecular polyurea layer is sealed and supported on the surrounding rock of the tunnel wall by using the concrete leveling layer, which can prevent the polyurea layer from detaching from the rock surface and being damaged. At the same time, the polyurea layer can use its flexibility to adapt to the deformation caused by internal air pressure or external water pressure, thereby ensuring the structural stability of the concrete leveling layer. In addition, the polyurea layer has a good anti-seepage sealing effect. Even if slight cracks appear in the concrete leveling layer, the polyurea layer can ensure the sealing of the tunnel. Compared with the traditional steel plate lining, the sealing structure of the utility model is simpler, the construction is convenient, the cost is low, and it can achieve rapid construction and a short construction period. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0013] Figure 2 It is a structural schematic diagram of the utility model in which the concrete leveling layer is arranged in sections.
[0014] Marked in the figure are: 1-hole wall surrounding rock, 2-polyurea layer, 3-concrete leveling layer, 4-X-shaped slope, 5-filling movable slider, 6-anti-seepage layer. DETAILED DESCRIPTION
[0015] The present invention will be further described below with reference to the accompanying drawings.
[0016] It should be noted that if directional terms are used in this utility model, such as "up," "down," "left," "right," "front," and "back," these are intended to facilitate the description of the relative positions of components and are not intended to specify the absolute positions of the related components or the positional relationships between them. They are only used to explain the relative positional relationships and movement of the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly. If terms related to quantity are used in this utility model, such as "multiple," "a plurality," or "several," these specifically refer to two or more.
[0017] like Figure 1As shown, the present invention provides a sealing structure for a gas storage tunnel, comprising a lining structure disposed on the tunnel wall surrounding rock 1. The lining structure includes a polyurea layer 2 and a concrete leveling layer 3. The polyurea layer 2 is sprayed onto the tunnel wall surrounding rock 1, and the concrete leveling layer 3 is disposed on the polyurea layer 2. The polyurea layer 2 is a type of polymer compound generated by the reaction of an isocyanate component and an amino compound, and possesses superior physical and chemical properties, including high tensile strength, impact strength, flexibility, wear resistance, aging resistance, wet-slip resistance, and corrosion resistance. The present invention utilizes an existing mature product, spraying it onto the tunnel wall surrounding rock 1. It cures rapidly and seals the tunnel inner wall. However, considering the risk of detachment from the tunnel wall surrounding rock 1 due to internal air pressure and external water pressure, a layer of concrete leveling layer 3 is sprayed onto the inner surface of the polyurea layer 2 to protect it, sealing and supporting it on the tunnel wall surrounding rock 1. This prevents the polyurea layer 2 from detaching from the rock surface and being damaged. At the same time, the polyurea layer 2 can utilize its flexibility to adapt to deformation caused by internal air pressure or external water pressure, ensuring the structural stability of the concrete leveling layer 3. Therefore, the polyurea layer 2 has a good anti-seepage sealing effect. Even if the concrete leveling layer 3 has minor cracks, the polyurea layer 2 can still ensure the sealing of the tunnel.
[0018] According to the internal air pressure and external water pressure that a gas storage tunnel is usually subjected to, the tunnel lining needs to withstand a high internal pressure of more than 10 MPa. Therefore, according to material tests, the thickness of the polyurea layer 2 should be no less than 2 cm.
[0019] In order to ensure that the concrete leveling layer 3 can provide sufficient support for the polyurea layer 2, it is best to use a reinforced concrete structure. The concrete leveling layer 3 can fill the unevenness of the excavated cavern surface and smooth its inner wall to make its cross-section circular, which is beneficial to the operation and maintenance of the gas storage tunnel.
[0020] Further, such as Figure 2As shown, in order to adapt to the deformation of the concrete leveling layer 3 caused by internal and external pressure, the concrete leveling layer 3 can be set as a segmented spraying structure, that is, the steel bars are tied in sections and then the concrete is sprayed in sections. The spliced ends of two adjacent sections of the concrete leveling layer 3 are provided with an X-shaped groove 4, and an X-shaped caulking movable slider 5 with a cross-section that adapts to the X-shaped groove 4 is provided inside the X-shaped groove 4. During specific construction, the caulking movable slider 5 can be placed at the splicing part of each section of the concrete leveling layer 3, and then spraying can be carried out to form the X-shaped groove 4 and ensure its stable connection with the caulking movable slider 5. The purpose of setting the X-shaped groove 4 and the movable caulking slider 5 is that no matter whether the movable caulking slider 5 is moved outward by the internal air pressure or moved inward by the external water pressure, it can seal the splicing gaps between each section of the concrete leveling layer 3 by cooperating with the conical surface, thereby adapting to the deformation of the concrete leveling layer 3 caused by the internal and external pressures, avoiding the occurrence of cracks on the concrete leveling layer 3, and further improving the sealing effect of the entire tunnel lining.
[0021] The movable caulking slider 5 is preferably made of a material with an elastic modulus lower than that of the concrete screed 3, such as ultra-high molecular weight polyethylene (UHMWPE), which has an elastic modulus of 0.69 GPa, lower than that of concrete. This material has high strength and toughness, can meet the support and installation requirements of the concrete screed 3, and can also adapt to the deformation and extrusion of the concrete screed 3 to a certain extent. For areas that do not require excessive bearing strength, slightly softer materials such as polytetrafluoroethylene (PTFE) can also be used.
[0022] In addition, to prevent the internal air pressure from impacting the inner surface of the concrete screed 3, an anti-seepage layer 6 may be applied to the inner surface of the concrete screed 3. The anti-seepage layer 6 may be made of a flexible sealing material, such as polyurea waterproof material or epoxy resin waterproof coating, which can not only enhance the sealing effect but also protect the concrete screed 3.
Claims
1. A sealing structure for a gas storage tunnel, comprising a lining structure arranged on a tunnel wall surrounding rock (1), characterized in that: The lining structure comprises a polyurea layer (2) and a concrete leveling layer (3); the polyurea layer (2) is sprayed on the cave wall surrounding rock (1); and the concrete leveling layer (3) is arranged on the polyurea layer (2).
2. The sealing structure for a gas storage tunnel according to claim 1, wherein: The thickness of the polyurea layer (2) is not less than 2 cm.
3. The sealing structure for a gas storage tunnel according to claim 1, wherein: The concrete leveling layer (3) is a reinforced concrete structure, the inner wall of the concrete leveling layer (3) is flat and smooth, and the cross section is circular.
4. The sealing structure for a gas storage tunnel according to claim 3, wherein: The concrete leveling layer (3) is a segmented spraying structure, and the spliced ends of two adjacent segments of the concrete leveling layer (3) are provided with an X-shaped groove (4), and an X-shaped caulking movable slider (5) with a cross section adapted to the X-shaped groove (4) is provided in the X-shaped groove (4).
5. The sealing structure for a gas storage tunnel according to claim 4, characterized in that: The elastic modulus of the joint-filling movable slider (5) is smaller than the elastic modulus of the concrete leveling layer (3).
6. The sealing structure for a gas storage tunnel according to claim 4, characterized in that: The inner surface of the concrete leveling layer (3) is coated with an anti-seepage layer (6).