Flexible sealing layer for energy storage chamber of underground artificial tunnel and construction method

Abstract

The invention discloses an underground artificial tunnel energy storage cavern flexible sealing layer which is formed by lap joint of a plurality of flexible sealing units, and each flexible sealing unit comprises a high-elasticity rubber body layer, an HDPE stereoscopic film and a high-strength filament net; the high-strength filament net is attached to the inner side face of the HDPE three-dimensional film, then the high-elasticity rubber body is sprayed to achieve composite connection, the ends of the anchoring parts are arranged in a protruding mode and poured together with concrete, and tight connection and attachment of the HDPE three-dimensional film, the high-strength filament net and the high-elasticity rubber body and the reinforced concrete lining are achieved; the sealing performance and the pressure resistance of the energy storage cavern of the artificial tunnel are improved; the flexible sealing layer forms a full-wrapping complete HDPE three-dimensional anti-leakage system, potential leakage of an internal energy storage medium passing through the energy storage cavern structure is comprehensively blocked, local defects such as the leakage risk of cracks caused by deformation of the energy storage cavern are greatly reduced, the sealing performance of the structure can be guaranteed to the maximum extent, the service life of the energy storage cavern is greatly prolonged, and the energy storage cavern is suitable for large-scale popularization and application. And the energy storage efficiency of the cavern is improved.

Description

Technical Field

[0001] The invention relates to the technical field of compressed air energy storage cavern engineering, and more particularly to a flexible sealing layer of an underground artificial tunnel energy storage cavern and a construction method thereof. Background Art

[0002] Compressed air energy storage is a technology that uses compressed air as a medium to store energy and generate electricity. When electricity consumption is low, it uses wind power and excess electricity from the power grid to drive air compressors, converting electrical energy into compressed air internal energy and storing it in underground caverns. When electricity consumption is high, it releases high-pressure air and converts the potential energy of compressed air into mechanical energy to drive the generator, thereby generating electricity.

[0003] There are mainly two types of gas storage facilities for compressed gas energy storage power stations: above-ground and underground. Considering safety factors, underground gas storage facilities are more feasible. Artificially excavated underground energy storage caverns are a type of underground gas storage facilities, which have the advantages of flexible site selection, low cost, safety and reliability.

[0004] Underground energy storage caverns must meet some extreme conditions, such as high pressure resistance (10MPa or even higher), good air tightness, stable structure, and the ability to withstand cyclic pressure and temperature changes. Cracks will appear in the concrete structure of the cavern; in underground energy storage caverns, high-pressure air needs to be sealed by a sealing layer; the sealing layer needs to be able to adapt to the deformation of the concrete structure, and when cracks appear in the concrete structure, there will be no risk of air leakage due to rupture of the flexible sealing layer.

[0005] The sealing layer of existing underground energy storage caverns generally adopts steel plate anti-seepage or flexible membrane anti-seepage layer structure. The former is costly, and the latter is very likely to cause the flexible membrane to rupture and leak at the structural cracks when cracks occur in the concrete structure. In addition, the flexible membrane has poor sealing at the joints and cannot meet the pressure environment above 10MPa, affecting the reliable operation of the energy storage power station. Summary of the invention

[0006] In view of this, the present invention provides a flexible sealing layer for an underground artificial tunnel energy storage chamber and a construction method, aiming to solve the above-mentioned technical problems.

[0007] In order to achieve the above object, the present invention adopts the following technical solution: A flexible sealing layer for an underground artificial tunnel energy storage chamber is formed by overlapping a plurality of flexible sealing units, wherein the flexible sealing unit comprises a high-elastic rubber body layer, a HDPE three-dimensional film and a high-strength fine wire mesh, wherein the high-elastic rubber body layer is composited on the inner side of the HDPE three-dimensional film, and the high-strength fine wire mesh is located between the high-elastic rubber body layer and the HDPE three-dimensional film.

[0008] Preferably, the HDPE three-dimensional film includes an HDPE film body and a plurality of anchor parts uniformly welded to the inner side of the HDPE film body, and the HDPE film body is a large-format HDPE rough-surface film; one end of each of the plurality of anchor parts is connected to the HDPE film body, and the other end passes through the high-strength fine wire mesh and the high-elastic rubber body layer.

[0009] Preferably, the high-elastic rubber body layer is compositely connected with the high-strength fine wire mesh and the HDPE three-dimensional membrane by spraying; the high-elastic rubber body layer is an anti-leakage reinforcement layer and will preferentially fill potential concrete deformation cracks, while the high-strength fine wire mesh can balance the local deformation of the high-elastic rubber body and protect the HDPE anti-seepage membrane from cracks.

[0010] The present invention provides a method for constructing a flexible sealing layer of an underground artificial tunnel energy storage chamber, comprising the following steps: S1. Complete the rock grouting consolidation or anchoring work around the tunnel; S2. Design and manufacture flexible sealing layers for underground artificial tunnel energy storage chambers, and overlap the flexible sealing units; S3, installation of inner lining steel mesh and pre-embedded fixed monitoring instruments; S4. Arrange the flexible sealing layer of the underground artificial tunnel energy storage chamber that has been overlapped on the inner side of the casting formwork or press it on the leveled concrete surface; S5. After pouring lining concrete and curing, remove the pouring formwork or pouring trolley; S6. Repair the tunnel and surrounding joints, and properly handle the overlaps between adjacent flexible sealing units.

[0011] Preferably, in step S2, the overlapping processing method between adjacent flexible sealing units is: the sides of the overlapping parts of adjacent flexible sealing units are welded by hot-melt continuous single seam welding, the middle of the overlapping parts are bonded by heat-resistant glue; the outside of the overlapping parts is sealed by high-elastic rubber spraying.

[0012] Preferably, in step S6, the method for repairing the tunnel and the surrounding joints is: to perform treatment according to the overlapping treatment method shown between adjacent flexible sealing units.

[0013] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a flexible sealing layer and a construction method for an underground artificial tunnel energy storage chamber, which has the following beneficial effects: The present invention designs a HDPE three-dimensional membrane, a high-strength fine wire mesh is attached to the inner side of the HDPE three-dimensional membrane, and then a layer of high-elastic rubber body is sprayed to realize the composite of the HDPE three-dimensional membrane, the high-strength fine wire mesh and the high-elastic rubber body, and the high-strength fine wire mesh and the high-elastic rubber body are protruded from the ends of the anchor pieces in the HDPE three-dimensional membrane, and are cast together with the concrete to realize the tight connection and attachment of the HDPE three-dimensional membrane, the high-strength fine wire mesh and the high-elastic rubber body with the reinforced concrete lining; improve the sealing and pressure resistance of the artificial tunnel energy storage chamber; completely block the potential leakage of the internal energy storage medium through the energy storage chamber structure, greatly reduce the local defects caused by the deformation of the energy storage chamber, such as the risk of leakage from cracks, can maximize the sealing of the structure, greatly extend the service life of the energy storage chamber, and improve the efficiency of chamber energy storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0015] Figure 1 The accompanying drawing is a schematic diagram of the overall structure of the flexible sealing layer of the underground artificial tunnel energy storage chamber provided by the present invention; Figure 2 The accompanying drawing is a schematic diagram of the structure of an underground artificial tunnel energy storage chamber provided by the present invention; in: 1. High elastic rubber body layer; 2. HDPE three-dimensional membrane; 3. High-strength fine wire mesh; 4. HDPE membrane body; 5. Anchor parts; 6. Consolidated rock anchor system; 7. Concrete lining; 8. Hot-melt welding seam; 9. Heat-resistant adhesive bonding layer; 10. High elastic rubber sealing layer. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] See also Figure 1-2An embodiment of the present invention discloses a flexible sealing layer for an underground artificial tunnel energy storage chamber, which is formed by overlapping a plurality of flexible sealing units. The flexible sealing unit includes a high-elastic rubber body layer 1, a HDPE three-dimensional film 2, and a high-strength fine wire mesh 3. The high-elastic rubber body layer 1 is compounded on the inner side of the HDPE three-dimensional film 2, and the high-strength fine wire mesh 3 is located between the high-elastic rubber body layer 1 and the HDPE three-dimensional film 2.

[0018] The high-strength fine wire mesh 3 is attached to the inner side of the HDPE three-dimensional film 2, and the high-elastic rubber body is sprayed on the outer side of the high-strength fine wire mesh 3 by spraying, so as to realize the composite connection of the HDPE three-dimensional film 2, the high-strength fine wire mesh 3 and the high-elastic rubber body.

[0019] In order to further optimize the above technical solution, the HDPE three-dimensional film 2 includes a HDPE film body 4 and a plurality of anchor parts 5 uniformly welded to the inner side of the HDPE film body 4, and the HDPE film body 4 is a large-format HDPE rough surface film; the plurality of anchor parts 5 are connected to the HDPE film body 4 at one end, and the other end passes through the high-strength fine wire mesh 3 and the high-elastic rubber body layer 1.

[0020] In this embodiment, a high-quality large-format HDPE rough surface membrane is used as the membrane body to avoid the traditional small-format waterproof membrane method (avoiding the traditional flexible waterproofing, which adopts the waterproof membrane pre-laying and bonding process in blocks, has many overlapping parts, and is easily affected by the process and the environment and has defects), and a flexible production line is used for welding HDPE anchors, and the welding is carried out by hot melt or ultrasonic welding, and the three-dimensional HDPE overlap adopts detectable double-seam welding; the HDPE membrane adopts a rough surface at least close to the concrete surface to maintain the necessary friction with the surrounding soil, and the contact surface with the concrete lining 7 adopts a uniformly distributed anchor structure, so that the HDPE membrane and the concrete lining 7 structure are tightly combined, and a high standard of anti-leakage function is exerted, and it is not easy to break.

[0021] HDPE film is processed in the factory, and the seams are more reliable and detectable, avoiding the problems of traditional flexible waterproof layers such as small format, large number of splicing, difficult detection, difficult quality control, and poor adaptability to later deformation.

[0022] In order to further optimize the above technical solution, the high elastic rubber body layer 1 is compositely connected with the high strength fine wire mesh 3 and the HDPE three-dimensional film 2 by spraying.

[0023] The present invention provides a method for constructing a flexible sealing layer of an underground artificial tunnel energy storage chamber, comprising the following steps: S1. Complete the rock grouting consolidation or anchoring work around the tunnel; S2. Design and manufacture flexible sealing layers for underground artificial tunnel energy storage chambers, and overlap the flexible sealing units; S3, installation of inner lining steel mesh and pre-embedded fixed monitoring instruments; S4. Arrange the flexible sealing layer of the underground artificial tunnel energy storage chamber that has been overlapped on the inner side of the casting formwork or press it on the leveled concrete surface; S5. After pouring lining concrete and curing, remove the pouring formwork or pouring trolley; S6. Repair the tunnel and surrounding joints, and properly handle the overlaps between adjacent flexible sealing units.

[0024] In this embodiment, in step S1 and step S3, the grouting consolidation or anchoring work of the rock around the tunnel and the installation of the lining steel mesh and the pre-buried fixed monitoring instruments are all existing conventional construction processes, which will not be repeated here. The grouting consolidation or anchoring work of the rock around the tunnel is completed to form a consolidated rock anchor system 6; in step S2, in the production of the flexible sealing layer of the underground artificial tunnel energy storage cavern, a suitable HDPE three-dimensional film 2 is selected to lay a high-strength fine wire mesh layer, and then a high-strength rubber body is sprayed on the wire mesh and the membrane base of the HDPE three-dimensional film 2, with a thickness of not less than 0.5 cm; the underground artificial tunnel energy storage cavern generally requires two or more flexible sealing units for overlap treatment, and the overlap treatment method between adjacent flexible sealing units is: the sides of the overlapping parts of the adjacent flexible sealing units are welded by hot-melt continuous single seam welding to form a hot-melt welding seam 8, and the middle of the overlapping parts are bonded by heat-resistant adhesive to form a heat-resistant adhesive bonding layer 9; the outside of the overlapping parts is sealed by high-elastic rubber spraying to form a high-elastic rubber sealing layer 10.

[0025] In this embodiment, in step S6, the method for repairing the tunnel and the surrounding joints is: cleaning the defective parts, spraying the high-strength rubber body, and the surrounding joints are treated in the same way as the overlap between the flexible sealing units, covering the flexible sealing units, welding, heat-resistant adhesive bonding, and high-elastic rubber spraying and sealing. Repair of defects in the tunnel and the surrounding joints that are holes or holes: cleaning the defective parts, spraying the high-strength rubber body, and then covering the strong adhesive HDPE film on the outside, the outer edge of the HDPE film is welded by hot-melt single seam welding, and the overlapped outside is sealed by high-strength rubber spraying.

[0026] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0027] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A flexible sealing layer for an underground artificial tunnel energy storage chamber, characterized in that: It is formed by overlapping a plurality of flexible sealing units, wherein the flexible sealing unit comprises a high-elastic rubber layer, a HDPE three-dimensional film and a high-strength fine wire mesh, wherein the high-elastic rubber layer is compounded on the inner side of the HDPE three-dimensional film, and the high-strength fine wire mesh is located between the high-elastic rubber layer and the HDPE three-dimensional film.

2. The flexible sealing layer for energy storage chamber of an underground artificial tunnel according to claim 1, characterized in that: The HDPE three-dimensional film includes an HDPE film body and a plurality of anchoring parts uniformly welded to the inner side of the HDPE film body. The HDPE film body is a large-format HDPE rough-surface film. One end of each of the plurality of anchoring parts is connected to the HDPE film body, and the other end passes through the high-strength fine wire mesh and the high-elastic rubber body layer.

3. The flexible sealing layer of an underground artificial tunnel energy storage chamber according to claim 1, characterized in that: The high-elastic rubber body layer is compositely connected with the high-strength fine wire mesh and the HDPE three-dimensional film by spraying.

4. A method for constructing a flexible sealing layer of an underground artificial tunnel energy storage chamber, characterized in that: The steps include: S1. Complete the rock grouting consolidation or anchoring work around the tunnel; S2. Design and manufacture flexible sealing layers for underground artificial tunnel energy storage chambers, and overlap the flexible sealing units; S3, installation of inner lining steel mesh and pre-embedded fixed monitoring instruments; S4. Arrange the flexible sealing layer of the underground artificial tunnel energy storage chamber that has been overlapped on the inner side of the casting formwork or press it on the leveled concrete surface; S5. After pouring lining concrete and curing, remove the pouring formwork or pouring trolley; S6. Repair the tunnel and surrounding joints, and properly handle the overlaps between adjacent flexible sealing units.

5. The method for constructing an underground artificial tunnel energy storage chamber according to claim 4, characterized in that: In step S2, the overlapping processing method between adjacent flexible sealing units is: the sides of the overlapping parts of adjacent flexible sealing units are welded by hot-melt continuous single seam welding, the middle of the overlapping parts are bonded by heat-resistant glue; the outside of the overlapping parts is sealed by high-elastic rubber spraying.

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