Combined sealing lining structure of compressed air energy storage power station underground cavern and construction method

Abstract

A kind of compressed air energy storage power station underground cavern combined sealing lining structure, including U-shaped steel, sealing layer, rubber pad and anchor rod;U-shaped steel is the framework of combined dome sealing lining structure, sealing layer is arranged in the inner wall of compressed air energy storage power station underground cavern and is fixed between U-shaped steel, construction method includes the following steps: step (1) drill anchor bolt hole in the inner wall of surrounding rock of underground cavern corresponding position;Step (2) drill anchor bolt hole in the corresponding position;Step (3) brush coating sliding layer on the inner wall of concrete lining;Step (4) place sealing layer;Step (5) tightly wrap around sealing layer using rubber pad;Step (6) the U-shaped steel is anchored on the inner wall of concrete lining using anchor bolt;Step (7) weld the intersection of U-shaped steel;Step (8) carry out test gas storage.The present application can provide a new lining form for the dome part of compressed air energy storage power station underground rock lining gas storage chamber, which is reasonable in design, economical in cost, airtight and safe in construction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressed air energy storage, in particular to a combined sealing lining structure of a compressed air energy storage power station underground cavern and a construction method. BACKGROUND

[0002] The compressed air energy storage technology is an environmentally friendly and efficient large-capacity long-time physical energy storage technology, which does not need to use fossil fuels and does not emit harmful substances, so it is friendly to the environment. This technology has a significant improvement effect on the time and space structure of power generation and power consumption of the power grid, and at the same time enhances the peak shaving capacity of the power grid and solves the intermittency problem of renewable energy. In China, this technology is being widely promoted and applied.

[0003] The compressed air energy storage system mainly uses ground steel tanks / steel pipes, salt rock caves and artificial lining caverns as high-pressure air storage containers. At present, large-scale storage devices mainly rely on salt caves and artificial lining caverns, and with the continuous advancement of industrialization, artificial lining caverns will become a widely used gas storage means. Unlike general underground caverns, artificial lining caverns used for gas storage need to withstand high internal pressure, high temperature changes and high frequency alternating loads, which poses new challenges to the design of the sealing layer of the cavern.

[0004] In traditional design, steel plates are often used as sealing materials, but they have high cost, good heat preservation performance but poor performance under high temperature load. Recent studies have shown that rubber materials have the basic conditions to become the sealing layer of high-pressure gas storage caverns, as they not only have low cost, but also have excellent mechanical properties and sealing performance. However, traditional rubber gas storage materials are usually manufactured in a whole structure, so they face some difficulties in the installation process of underground gas storage caverns. In traditional construction, workers often construct from the top of the cavern to the bottom of the vertical shaft opening for hoisting operations, which is extremely difficult and dangerous to operate. How to design a sealing lining structure that is easy to install, has high efficiency, excellent sealing performance, lower cost and safe construction has become a problem that needs to be solved. SUMMARY

[0005] The first purpose of the present application is to solve the difficulties of the prior art, and to provide a combined dome sealing lining structure of a compressed air energy storage power station underground rock lining cavern and a construction method, which can solve the problem of high cost caused by the use of steel plates in the sealing layer of the underground cavern. Compared with the whole steel plate sealing layer, it is more convenient to install, has higher efficiency and lower cost; the operation platform and the sliding safety lock connection device can solve the problem of high operation difficulty and construction danger, and compared with the vertical shaft opening hanging construction, it is safer and easier to operate, and can provide help during the construction and operation of the underground cavern.

[0006] A combined sealing lining structure of underground cavern of compressed air energy storage power station, comprising U-shaped steel, sealing layer, rubber pad and anchor rod;

[0007] The U-shaped steel is the framework of the combined sealing lining structure of dome, which is arranged on the concrete lining layer of the inner wall of the underground cavern of the compressed air energy storage power station, and is used to fix the sealing layer inside the underground cavern.

[0008] The sealing layer is arranged on the inner wall of the underground cavern of the compressed air energy storage power station and is fixed between each U-shaped steel, so as to form an airtight sealing layer on the surface of the underground cavern.

[0009] The rubber pad is arranged between the U-shaped steel and the sealing layer as a sealing and buffering material, and is tightly attached to the U-shaped steel and the sealing layer.

[0010] The top of the U-shaped steel is provided with anchor bolt holes at a certain distance, and the U-shaped steel is fixedly connected with the concrete lining layer by penetrating the rubber pad through the anchor bolt holes.

[0011] Further, the U-shaped steel includes linear U-shaped steel, circular U-shaped steel and arc-shaped U-shaped steel.

[0012] The linear U-shaped steel is a linear framework installed in the linear segment of the underground cavern of the compressed air energy storage power station, and is arranged along the axis of the linear segment of the underground cavern and is arranged in sequence and at intervals around the linear segment.

[0013] The circular U-shaped steel is a circular framework installed in the linear segment of the underground cavern of the compressed air energy storage power station, and is arranged along the circumference of the linear segment of the underground cavern and is arranged in sequence and at intervals along the axis of the linear segment.

[0014] The arc-shaped U-shaped steel is an arc-shaped framework installed at the dome of the top end of the underground cavern of the compressed air energy storage power station, and is arranged in sequence and at intervals around the sidewall of the dome of the underground cavern.

[0015] Further, the shape of the sealing layer needs to be designed to fit the inside of the concrete lining layer, and the corresponding adjustment is made according to the curvature of the concrete lining layer.

[0016] Further, the material of the sealing layer has the advantages of high temperature resistance and strong plastic deformation capacity, and the four sides are designed in the form of protruding buckles and are embedded in the grooves of the U-shaped steel.

[0017] Further, the U-shaped steel is a special framework, which is spliced by welding at the intersection.

[0018] A construction method of a combined sealing lining structure of underground cavern of compressed air energy storage power station, comprising the following steps:

[0019] Step (1), drilling anchor bolt holes at corresponding positions of the inner wall of the underground cavern;

[0020] Step (2), drilling anchor holes at corresponding positions on the inner wall of the concrete lining layer of the underground cavern;

[0021] Step (3), applying a sliding layer on the inner wall of the concrete lining layer of the underground cavern;

[0022] Step (4), placing the sealing layer according to the pre-designed position, the sliding layer applied in step (3) has a certain viscosity, which can preliminarily fix the position of the sealing layer;

[0023] Step (5), using the rubber pad to tightly wrap around the sealing layer;

[0024] Step (6), anchoring the U-shaped steel to the inner wall of the concrete lining layer using anchor nails, and ensuring that the rubber pad is completely pressed between the sealing layer and the U-shaped steel;

[0025] Step (7), welding is used at the intersection of the U-shaped steels to ensure the sealing of the overall structure;

[0026] Step (8) is to conduct experimental gas storage to determine the sealing performance and monitor possible leakage points.

[0027] The present invention has the following beneficial effects: The proposed modular dome-sealed lining structure and construction method for underground rock-lined storage chambers in compressed air energy storage power stations provide a new lining structure with a rational design, economical construction, tight sealing, and safe construction for the dome portion of underground rock-lined gas storage chambers in compressed air energy storage power stations. Furthermore, the invention is technologically mature, with lower material costs than steel plate linings, and offers minimal technical complexity in construction, installation, and subsequent maintenance, making it suitable for large-scale application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide further explanation of the present invention and constitute a part of this application, but they do not constitute an improper limitation of the present invention. The present invention will be further described below in conjunction with the drawings and embodiments.

[0029] Figure 1 A three-dimensional schematic cross-sectional view of the combined sealing liner structure of the present invention;

[0030] Figure 2 A detailed three-dimensional schematic diagram of the relationship between the combined sealing lining structure and the concrete lining structure of the present invention;

[0031] Figure 3 A cross-sectional view showing the relationship between the combined sealing lining structure and the concrete lining structure of the present invention;

[0032] Figure 4 A detailed cross-sectional view of the relationship between the combined sealing lining structure and the concrete lining structure of the present invention;

[0033] Figure 5 Partial relationship diagram of the combined sealing lining structure of the present application.

[0034] In the figure, concrete lining layer-1, U-shaped steel-2, linear U-shaped steel-21, circular U-shaped steel-22, arc-shaped U-shaped steel-23, sealing layer-3, rubber pad-4, anchor rod-5, and welding seam-6. DETAILED DESCRIPTION

[0035] The present application will be further described below in conjunction with the accompanying drawings and embodiments: Figures 1-5 The present application will be further described below in conjunction with the accompanying drawings and embodiments:

[0036] As shown in the drawings, Figures 1-3 A combined sealing lining structure of an underground cavern of a compressed air energy storage power station, comprising a U-shaped steel 2, a sealing layer 3, a rubber pad 4, and an anchor rod 5.

[0037] The U-shaped steel 2 is the framework of the combined dome sealing lining structure, which is arranged on the concrete lining layer 1 of the inner wall of the underground cavern of the compressed air energy storage power station, and is used to fix the sealing layer 3 inside the underground cavern.

[0038] The sealing layer 3 is arranged on the inner wall of the underground cavern of the compressed air energy storage power station and is fixed between each U-shaped steel 2, and is used to form a gas-tight sealing layer 3 on the surface of the underground cavern.

[0039] The rubber pad 4 is arranged between the U-shaped steel 2 and the sealing layer 3 as a sealing buffer material, and is tightly attached to the U-shaped steel 2 and the sealing layer 3.

[0040] The top of the U-shaped steel 2 is provided with anchor bolt openings at a certain distance, and the U-shaped steel 2 is fixedly connected with the concrete lining layer 1 by passing the anchor bolt through the opening, with the rubber pad 4 passing therebetween.

[0041] Further, the U-shaped steel 2 includes a linear U-shaped steel 21, a circular U-shaped steel 22, and an arc-shaped U-shaped steel 23.

[0042] The linear U-shaped steel 21 is a linear framework installed in the linear segment of the underground cavern of the compressed air energy storage power station, and is arranged along the axis of the linear segment of the underground cavern and is arranged in sequence and at intervals around the linear segment.

[0043] The circular U-shaped steel 22 is a circular framework installed in the linear segment of the underground cavern of the compressed air energy storage power station, and is arranged along the circumference of the linear segment of the underground cavern and is arranged in sequence and at intervals along the axis of the linear segment.

[0044] The arc-shaped U-shaped steel 23 is an arc-shaped framework installed at the dome of the top end of the underground cavern of the compressed air energy storage power station, and is arranged in sequence and at intervals along the sidewall of the dome of the underground cavern.

[0045] Further, the sealing layer 3 is designed to fit the inside of the concrete lining layer 1, and is adjusted according to the curvature of the concrete lining layer 1.

[0046] Further, the sealing layer 3 is designed to fit the inside of the concrete lining layer 1, and is adjusted according to the curvature of the concrete lining layer 1, and is adjusted according to the curvature of the concrete lining layer 1. Figure 4

[0047] Further, the U-shaped steel 2 is a special skeleton, and is spliced by welding at the intersection, as shown in the figure to form a weld 6. Figure 5

[0048] A construction method of a combined sealing lining structure of a compressed air energy storage power station underground cavern, comprising the following steps:

[0049] Step (1), drilling anchor holes in the corresponding position of the inner wall of the surrounding rock of the underground cavern;

[0050] Step (2), drilling anchor holes in the corresponding position of the inner wall of the concrete lining layer 1 of the underground cavern;

[0051] Step (3), brushing a sliding layer on the inner wall of the concrete lining layer 1 of the underground cavern;

[0052] Step (4), placing the sealing layer 3 according to the pre-designed position, and the sliding layer brushed in step (3) has certain viscosity, which can preliminarily fix the position of the sealing layer 3;

[0053] Step (5), tightly wrapping the sealing layer 3 around with the rubber pad 4;

[0054] Step (6), anchoring the U-shaped steel 2 on the inner wall of the concrete lining layer 1 with anchor nails, and ensuring that the rubber pad 4 is completely pressed between the sealing layer 3 and the U-shaped steel 2;

[0055] Step (7), welding the intersection of the U-shaped steel 2 to ensure the sealing of the overall structure;

[0056] Step (8), carrying out test storage to determine the sealing performance and monitor possible air leakage points.

[0057] The specific embodiments are only an explanation of the present application, and are not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, and the modifications are protected by the patent law as long as they are within the scope of the claims of the present application.​​

Claims

1. A combined sealing lining structure for underground caverns of compressed air energy storage power plants, characterized in that, The U-shaped steel, the sealing layer, the rubber pad and the anchor rod are included. The U-shaped steel is a framework of the combined dome sealing inner lining structure, which is arranged on the concrete lining layer of the inner wall of the underground cavern of the compressed air energy storage power station, and directly fixes the sealing layer inside the underground cavern of the compressed air energy storage power station. The sealing layer is arranged on the inner wall of the underground cavern of the compressed air energy storage power station and is fixed between each U-shaped steel. The rubber pad is arranged between the U-shaped steel and the sealing layer as a sealing and buffering material, and the rubber pad tightly wraps around the sealing layer to tightly adhere to the U-shaped steel and the sealing layer. The top of the U-shaped steel is provided with anchor bolt holes at a certain distance, and the anchor bolt is used to fix and connect the U-shaped steel and the concrete lining layer, and the rubber pad is penetrated therebetween. The U-shaped steel includes linear U-shaped steel, circular U-shaped steel and arc-shaped U-shaped steel. The linear U-shaped steel is a linear framework arranged in the linear section of the underground cavern of the compressed air energy storage power station, which is arranged along the axis of the linear section and is arranged in sequence and at intervals around the linear section. The circular U-shaped steel is a circumferential framework arranged in the linear section of the underground cavern of the compressed air energy storage power station, which is arranged along the circumference of the linear section and is arranged in sequence and at intervals along the axis of the linear section. The arc-shaped U-shaped steel is an arc-shaped framework arranged at the dome top of the underground cavern of the compressed air energy storage power station, which is arranged in sequence and at intervals along the dome sidewall of the underground cavern. The sealing layer is designed to fit the inside of the concrete lining layer, and the curvature of the concrete lining layer is adjusted accordingly. The sealing layer is made of material that can withstand high temperature and has plastic deformation capacity, and the four edges are designed in the form of convex buckles and are embedded in the grooves of the U-shaped steel. The U-shaped steel is spliced by welding at the intersection.

2. A method of construction of a combined sealing lining structure for a compressed air energy storage power plant underground cavern according to claim 1, characterized in that The method comprises the following steps: Step (1), drilling anchor bolt holes at the corresponding positions of the surrounding rock of the underground cavern of the compressed air energy storage power station; Step (2), drilling anchor bolt holes at the corresponding positions of the inner wall of the concrete lining layer of the underground cavern of the compressed air energy storage power station; Step (3), brushing a sliding layer on the inner wall of the concrete lining layer of the underground cavern of the compressed air energy storage power station; Step (4), placing the sealing layer at the positions designed in advance, and the sliding layer brushed in step (3) has certain viscosity, which can preliminarily fix the position of the sealing layer; Step (5), tightly wrapping the sealing layer with the rubber pad; Step (6), anchoring the U-shaped steel on the inner wall of the concrete lining layer with the anchor bolt, and ensuring that the rubber pad is completely pressed between the sealing layer and the U-shaped steel; Step (7), welding at the intersection of the U-shaped steel; Step (8), carrying out test storage to determine the sealing performance and monitor possible air leakage points.

Images