Lining structure enabling compressed air energy storage artificial chamber to adapt to temperature deformation

Abstract

The utility model relates to the field of compressed air energy storage, in particular to a lining structure enabling a compressed air energy storage artificial chamber to adapt to temperature deformation, which comprises a steel plate lining arranged on the inner wall of the chamber, an annular bulge is arranged on the inner wall of the chamber along the normal direction of the chamber, and an annular structural joint is arranged in the annular bulge. According to the utility model, special structural design is carried out on the steel plate lining and the reinforced concrete lining at the structural joint, so that the steel plate lining can maintain structural stability at the structural joint when bearing temperature load and larger air internal pressure, and the overall sealing effect of the gas storage is ensured. The steel plate lining is prepared into an n shape, the local thickness of the steel plate lining within the influence range of the structural joint is increased, and the air internal pressure bearing capacity of the steel plate lining at the structural joint is greatly enhanced; the structure shaped like the Chinese character'ji 'enables the steel plate lining to have a certain capability of longitudinal deformation after bearing temperature load. In this way, the overall sealing effect and the structural stability of the artificial chamber in the operation cycle are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of compressed air energy storage, and in particular to a lining structure that enables an artificial chamber for compressed air energy storage to adapt to temperature deformation. Background Technology

[0002] Compressed air energy storage (CASS) is a large-scale energy storage technology developed based on gas turbine technology. It is currently the most mature physical energy storage technology besides pumped hydro storage and is also one of the hot topics in large-scale energy storage research. CASS technology uses a compressor to compress air to a high-pressure state and stores it in sealed containers such as salt caverns, artificial chambers, or high-pressure vessels. During discharge, the compressed air drives a turbine to generate electricity. It is a low-cost, large-capacity, long-term, high-efficiency, and flexibly deployable new type of power energy storage technology. It can enhance the peak-shaving capacity of the power system, improve power supply reliability and the ability to absorb new energy sources, and provide frequency regulation, backup, rotational inertia, and emergency recovery services for the system.

[0003] During the construction of artificial tunnel chambers, to accommodate the concrete pouring capacity and deformation under temperature loads, the lining concrete of hydraulic tunnels typically features a circumferential structural joint every 20-30 meters along the tunnel axis. This ensures that the lengths of each lining section are roughly the same. Sequential pouring or skip-pour pouring methods are used, and elastic materials are filled into the structural joints, along with water-stopping structures. Compressed air energy storage power stations' underground artificial tunnels will withstand internal pressures of approximately 6-20 MPa during operation. To maintain the stability of the surrounding rock and limit high-pressure gas leakage, a combined lining structure of reinforced concrete lining and steel plate lining is typically used. During operation, the artificial tunnel will experience significant temperature variations due to continuous pressure changes. Therefore, the reinforced concrete lining needs to have a circumferential structural joint at regular intervals along the tunnel axis to accommodate the concrete pouring capacity and temperature deformation, and elastic materials are filled into the structural joints.

[0004] Currently, in underground artificial chambers for compressed air energy storage, outside the structural joints, the steel plate lining serves as a load-bearing structure and is typically thin. Because the structural joints require the filling of elastic materials to accommodate concrete deformation, the steel plate lining at these joints becomes a load-bearing structure, and thin steel plate linings are insufficient to meet its requirements. Furthermore, during operation, the artificial chamber experiences significant temperature loads due to continuous changes in gas pressure. Under these temperature loads, the steel plate lining will undergo longitudinal deformation along the chamber's axis. Excessive longitudinal deformation can lead to yielding failure of the steel plate lining.

[0005] Therefore, in the existing steel plate lining structure, the longitudinal steel plate lining sealing structure is prone to yield failure due to telescopic deformation under the action of temperature load. After continuously bearing a large internal air pressure in the circumferential direction, it will continuously deform along the structural joint towards the outer diameter direction of the chamber until it loses its original design function, ultimately leading to the failure of compressed air energy storage. Summary of the Invention

[0006] The purpose of the present utility model is to provide a lining structure that enables an artificial chamber for compressed air energy storage to adapt to temperature deformation, and can solve the technical problems of poor sealing performance and poor structural stability of the existing steel plate lining structure of the artificial chamber.

[0007] To achieve the above purpose, the present utility model provides the following technical solutions:

[0008] A lining structure that enables an artificial chamber for compressed air energy storage to adapt to temperature deformation designed by the present utility model includes a chamber with a cavity inside, a steel plate lining arranged on the inner wall of the chamber, and a reinforced concrete lining poured between the top wall of the chamber and the steel plate lining; a circumferential protrusion is provided on the inner wall of the chamber along the circumferential direction of the chamber, a circumferential structural joint is provided along the circumferential direction of the chamber inside the circumferential protrusion, the end of the circumferential structural joint is sealed by the steel plate lining, and an elastic material is filled in the circumferential structural joint.

[0009] As a preferred solution, it further includes longitudinal construction steel bars, radial stress steel bars, and circumferential stress steel bars. The longitudinal construction steel bars are arranged inside the reinforced concrete lining along the axial direction of the chamber and are spaced apart at the circumferential structural joint; the radial stress steel bars are arranged inside the chamber along the normal direction of the chamber, and both ends of the radial stress steel bars are located on the side of the circumferential structural joint; the circumferential stress steel bars are arranged inside the reinforced concrete lining along the circumferential direction of the chamber.

[0010] Further, there are two radial stress steel bars, symmetrically distributed on both sides of the circumferential structural joint.

[0011] Further, the thickness of the steel plate lining inside the circumferential protrusion is greater than the thickness outside the circumferential protrusion.

[0012] Further, the thickness of the steel plate lining inside the circumferential protrusion is 3 - 5 times the thickness outside the circumferential protrusion.

[0013] Further, there are multiple circumferential protrusions, spaced and arranged on the inner wall of the chamber and located between different segments of the reinforced concrete lining.

[0014] As a preferred solution, the cross-sections of both the circumferential protrusion and the steel plate lining are in a "U" shape.

[0015] Advantages of the present utility model:

[0016] Through special structural design of the steel lining and reinforced concrete lining at the structural joint, the steel lining can maintain structural stability at the structural joint when bearing temperature loads and relatively large internal air pressure, ensuring the overall sealing effect of the gas storage cavern. The present utility model reforms the conventional structural joint, prepares the steel lining into a "ji" shape, and increases the local thickness of the steel lining within the influence range of the structural joint, thereby greatly enhancing the ability of the steel lining to bear internal air pressure at the structural joint; in addition, the "ji" shape structure enables the steel lining to have a certain ability to undergo longitudinal deformation after bearing temperature loads. In the above manner, the overall sealing effect and structural stability of the artificial chamber during the operation period are ensured. Brief Description of the Drawings

[0017] Figure 1 is the top view of the present utility model.

[0018] Figure 2 is the partial reinforcement drawing of the present utility model at the structural joint.

[0019] Figure 3 is Figure 1 the sectional view at a-a in

[0020] Figure 4 is Figure 1 the sectional view at b-b in

[0021] The markings in the figure are:

[0022] 1 - Excavation contour line of surrounding rock; 2 - Circumferential structural joint; 3 - Reinforced concrete lining; 4 - Steel lining; 5 - Longitudinal structural steel bars; 6 - Radial stress steel bars; 7 - Circumferential stress steel bars; 8 - Circumferential protrusion. Detailed Embodiment

[0023] The following further describes the present utility model with reference to the drawings. It should be noted that if there are directional indications involved in the present utility model, such as the directional terms of up, down, left, right, front, and back, they are for the convenience of describing the relative position relationship between components. They are not specific absolute positions of the relevant components and the position relationship between components, but only used to explain the relative position relationship and movement conditions between components in a specific posture. If this specific posture changes, the directional indication will also change accordingly. If there are quantity terms involved in the present utility model, such as "many", "multiple", "several", etc., it specifically refers to two or more.

[0024] I, II, and III in the present utility model have no special meaning, and are only used to number the segments of the reinforced concrete lining in the drawings for more detailed explanation of the present utility model. The present utility model defines the direction along the axis of the chamber as the longitudinal direction, the direction along the normal of the chamber as the radial direction, and the direction along the circumference of the chamber as the circumferential direction.

[0025] The utility model relates to the field of compressed air energy storage, and particularly relates to a structural joint for a lining of an underground artificial chamber for compressed air energy storage to adapt to temperature deformation. Through special structural design of the steel lining and reinforced concrete lining at the structural joint, the steel lining can maintain structural stability at the structural joint when bearing temperature loads and relatively large internal air pressure, ensuring the overall sealing effect of the gas storage cavern. The utility model reforms the conventional structural joint, prepares the steel lining into a "U" shape, increases the local thickness of the steel lining within the influence range of the structural joint, thereby greatly enhancing the ability of the steel lining to bear the internal air pressure at the structural joint; in addition, the "U" shape structure enables the steel lining to have the ability to undergo longitudinal deformation after bearing temperature loads. The overall sealing effect and structural stability of the artificial chamber during the operation period are guaranteed through the above methods.

[0026] The utility model provides a lining structure for an artificial chamber for compressed air energy storage to adapt to temperature deformation, which includes a chamber with a cavity inside, a steel lining 4 arranged on the inner wall of the chamber, a reinforced concrete lining 3 poured between the top wall of the chamber and the steel lining 4, as well as longitudinal structural steel bars 5, radial stressed steel bars 6, and circumferential stressed steel bars 7; a circumferential protrusion 8 is arranged on the inner wall of the chamber along the circumferential direction of the chamber, a circumferential structural joint 2 is arranged inside the circumferential protrusion 8 along the circumferential direction of the chamber, the end of the circumferential structural joint 2 is sealed by the steel lining 4, and an elastic material is filled inside the circumferential structural joint 2.

[0027] The longitudinal structural steel bars 5 are arranged inside the reinforced concrete lining 3 along the axial direction of the chamber and are spaced apart at the circumferential structural joint 2; the radial stressed steel bars 6 are arranged inside the chamber along the normal direction of the chamber, and both ends of the radial stressed steel bars 6 are located on the sides of the circumferential structural joint 2; the circumferential stressed steel bars 7 are arranged inside the reinforced concrete lining 3 along the circumferential direction of the chamber. There are two radial stressed steel bars 6, which are symmetrically distributed on both sides of the circumferential structural joint 2, and the number of radial stressed steel bars 6 can also be configured according to the actual reinforcement calculation results. The thickness of the steel lining 4 inside the circumferential protrusion 8 is 3 to 5 times the thickness outside the circumferential protrusion 8. There are multiple circumferential protrusions 8, which are spaced apart on the inner wall of the chamber and are located between different segments of the reinforced concrete lining 3. The cross-sections of the circumferential protrusion 8 and the steel lining 4 are both in the shape of a "U".

[0028] The purpose of the utility model is to propose a new layout type of the lining structural joint of an underground artificial chamber for compressed air energy storage, so as to improve the performance of the steel lining at the structural joint to resist internal air pressure and the ability of the steel lining to adapt to temperature deformation, thereby ensuring the overall airtightness of the underground artificial chamber for compressed air energy storage during the operation process.

[0029] The technical solution adopted by the present utility model to solve its technical problems is as follows: A structural joint for a compressed air energy storage underground artificial chamber lining to adapt to temperature deformation, which includes a reinforced concrete lining and a steel plate lining successively arranged on the inner wall of the artificial chamber, a structural joint arranged between different segments of the reinforced concrete lining, and an elastic material filled in the structural joint.

[0030] The thickness of the reinforced concrete lining is not less than 80 cm, the length of a single segment is 8 - 12 m, and the concrete grade is not lower than C30.

[0031] The steel plate lining is in a "V" shape at the structural joint, protruding towards the normal direction of the chamber interior. The thickness of the steel plate lining outside the influence range of the structural joint is about 16 - 22 mm, and the thickness of the steel plate lining within the influence range of the structural joint is about 3 - 5 times that of other parts.

[0032] As Figure 1 shown, the structural joint for a compressed air energy storage underground artificial chamber lining to adapt to temperature deformation of the present utility model includes a reinforced concrete lining 3 inside the surrounding rock excavation contour line 1, a structural joint 2 between the reinforced concrete linings 3, an elastic material filled in the structural joint 2, a steel plate lining 4 inside the reinforced concrete lining 3, longitudinal structural steel bars 5 and radial stress-bearing steel bars 6 inside the reinforced concrete lining 3.

[0033] As Figure 2 、 3 shown, compared with the traditional tunnel support structure, the present utility model utilizes the "V" shape structure design at the structural joint, locally increases the thickness of the steel plate lining, enhances the performance of the steel plate lining at the structural joint to resist the internal air pressure and the ability of the steel plate lining to adapt to temperature deformation, and ensures that during the long-term operation of the compressed air energy storage underground artificial chamber, the steel plate lining will not undergo longitudinal yield along the chamber axis direction or yield along the cross-section direction at the structural joint.

[0034] To improve the stability and structural strength of the steel plate lining at the structural joint, the present utility model provides the following preferred solutions:

[0035] First, select an underground rock formation with sufficient strength and good integrity as the construction site for the underground artificial chamber.

[0036] The spatial form of the underground artificial chamber is tunnel-shaped, with a diameter of 10 - 15 m. After excavation, first use support means such as shotcrete and bolting to support and reinforce the weak rock formation, and grout the water seepage areas.

[0037] The surrounding rock outside the surrounding rock excavation contour line 1 of the underground artificial chamber is the main structure to bear the internal air pressure, and the steel plate lining 4 only bears the air pressure at the structural joint 2 and serves as a force transmission and sealing structure in the remaining parts.

[0038] As Figure 1 、4 As shown, the length of a single section of reinforced concrete lining is 8~12m to facilitate pouring construction. Considering structural strength, the thickness should not be less than 80cm.

[0039] Steel plate lining 4, in Figure 1 The thickness of segments AB and BC is 16~22mm, and the thickness of segment CD is increased to 3~5 times that of segment AB. The length of segment BC can be selected from 10~30cm, and the length of segment CD can be selected from 10~30cm.

[0040] The materials used in the compressed air energy storage underground artificial chamber lining structure of this utility model are all common building materials, which are relatively inexpensive and have low construction process requirements, thus achieving the effect of cost reduction and efficiency improvement. Other parts not described are all prior art.

[0041] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A lining structure for an artificial chamber for compressed air energy storage that adapts to temperature deformation, characterized in that: It includes a chamber with a cavity inside, a steel plate lining (4) provided on the inner wall of the chamber, and a reinforced concrete lining (3) poured between the top wall of the chamber and the steel plate lining (4); an annular protrusion (8) is provided on the inner wall of the chamber along the circumferential direction of the chamber, an annular structural joint (2) is provided in the annular protrusion (8) along the circumferential direction of the chamber, the end of the annular structural joint (2) is sealed by the steel plate lining (4), and an elastic material is filled in the annular structural joint (2).

2. The lining structure for a compressed air energy storage artificial chamber that adapts to temperature deformation according to claim 1, characterized in that: It further includes longitudinal construction steel bars (5), radial stressed steel bars (6), and circumferential stressed steel bars (7). The longitudinal construction steel bars (5) are arranged inside the reinforced concrete lining (3) along the axial direction of the chamber and are spaced apart at the annular structural joint (2); the radial stressed steel bars (6) are arranged inside the chamber along the normal direction of the chamber, and both ends of the radial stressed steel bars (6) are located on the side surfaces of the annular structural joint (2); the circumferential stressed steel bars (7) are arranged inside the reinforced concrete lining (3) along the circumferential direction of the chamber.

3. The lining structure for a compressed air energy storage artificial chamber that adapts to temperature deformation according to claim 2, characterized in that: There are two radial stressed steel bars (6), which are symmetrically distributed on both sides of the annular structural joint (2).

4. The lining structure for a compressed air energy storage artificial chamber that adapts to temperature deformation according to claim 3, characterized in that: The thickness of the steel plate lining (4) inside the annular protrusion (8) is greater than the thickness outside the annular protrusion (8).

5. The lining structure for a compressed air energy storage artificial chamber that adapts to temperature deformation according to claim 4, characterized in that: The thickness of the steel plate lining (4) inside the annular protrusion (8) is 3 to 5 times the thickness outside the annular protrusion (8).

6. The lining structure for a compressed air energy storage artificial chamber to adapt to temperature deformation according to claim 5, characterized in that: There are multiple annular protrusions (8), which are spaced and arranged on the inner wall of the chamber and are located between different segments of the reinforced concrete lining (3).

7. A lining structure for a compressed air energy storage artificial chamber to adapt to temperature deformation according to any one of claims 1 to 6, characterized in that: The cross-sections of both the annular protrusion (8) and the steel plate lining (4) are in a "C" shape.

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