Artificial hard rock gas storage cavern structure of compressed air energy storage power station

Abstract

The invention discloses an artificial hard rock gas storage cavern structure of a compressed air energy storage power station, which is characterized in that cavern structure layers respectively comprise a cavern primary support, a concrete lining layer, a flexible sealing layer, an elastic transition layer and a prefabricated lightweight concrete splicing layer from outside to inside, and the prefabricated lightweight concrete splicing layer is formed by splicing lightweight concrete prefabricated blocks on site; the elastic transition layer is made of a rubber elastic material, is adhered to the outer side of the prefabricated lightweight concrete assembly layer through an adhesive, and is used as a filling material between the flexible sealing layer and the prefabricated lightweight concrete assembly layer, so that external water pressure is uniformly transmitted to the prefabricated lightweight concrete assembly layer. The concrete lining layer in the traditional cavern structure design is divided into the inner layer and the outer layer, the flexible sealing layer is arranged in the middle, the gas sealing and waterproof functions of the flexible sealing layer are fully played, and the problem that the cavern structure is unstable due to the high external water pressure of the gas storage cavern under the construction working condition and the overhaul working condition is effectively solved.

Description

Technical Field

[0001] The invention belongs to the field of underground engineering cavern structure design, in particular to an artificial hard rock gas storage cavern structure of a compressed air energy storage power station. Background Art

[0002] At present, compressed air energy storage technology has become the mainstream large-scale long-term energy storage technology besides pumped storage technology. The design of the underground gas storage cavern structure has a great impact on the realization of the function and cost of the compressed air energy storage power station. The external pressure stability and internal pressure stability of the cavern structure are important control requirements. The existing underground gas storage cavern structure is mainly surrounding rock + primary support + secondary lining concrete + flexible sealing layer. The flexible sealing layer does not bear internal pressure, and its main function is to adapt to the deformation of the surrounding rock and seal the air; the main function of the secondary lining concrete is to transmit internal pressure and bear external pressure; the surrounding rock mainly bears internal pressure deformation. The main external forces borne by the underground cavern of the gas storage are mainly surrounding rock pressure, external force pressure and high internal pressure during operation. The above-mentioned cavern structure has good stability for surrounding rock pressure and high internal pressure. When bearing large external water pressure, due to cracks in the secondary lining concrete, the flexible sealing layer cannot change with the large external water pressure, resulting in the problem of falling off or failure. Summary of the invention

[0003] The purpose of the present invention is to provide a cavern structure of an artificial hard rock gas storage reservoir for a compressed air energy storage power station, which has good sealing performance, can jointly withstand the overall external pressure and partially withstand the external water pressure, and is easy to construct, so as to solve the above-mentioned problems existing in the prior art.

[0004] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present invention is as follows: a cavern structure of an artificial hard rock gas storage reservoir of a compressed air energy storage power station, wherein the cavern structure layers are respectively the initial support of the cavern, the concrete lining layer, the flexible sealing layer, the elastic transition layer, and the prefabricated lightweight concrete assembly layer from the outside to the inside. The prefabricated lightweight concrete assembly layer is assembled on-site using lightweight concrete prefabricated blocks to bear the external peripheral rock pressure and external water pressure, and has a thickness of 250 to 300 mm. The elastic transition layer is made of rubber elastic material with a thickness of 10 to 20 mm. It is adhered to the outside of the prefabricated lightweight concrete assembly layer with an adhesive as a filling material between the flexible sealing layer and the prefabricated lightweight concrete assembly layer, so that the external water pressure is evenly transferred to the prefabricated lightweight concrete assembly layer.

[0005] The flexible sealing layer is a thin steel plate or a flexible sealing material, which seals the air and also serves as an outer waterproof layer of the cave structure.

[0006] The concrete lining layer is concrete or reinforced concrete, with a thickness of 350-400 mm, and is re-injected concrete or cast-in-place concrete.

[0007] The initial support is a mesh sprayed concrete layer or a steel frame sprayed concrete layer with a thickness of 150 to 250 mm, which is in contact with the concrete lining layer.

[0008] The cross-section of the cave structure is a perfect circle.

[0009] The beneficial effect of the present invention is that the concrete lining layer in the traditional cavern structure design is divided into two layers, the inner and outer layers, and the flexible sealing layer is arranged in the middle, forming a cavern structure of the type of "concrete + sealing layer + concrete". The structural design is suitable for a variety of flexible sealing layers and concrete lining construction processes. The internal concrete layer in the present invention is prefabricated and assembled, and the construction is fast and rapid. The structural design gives full play to the sealing gas and waterproofing function of the flexible sealing layer, and effectively solves the problem of instability of the cavern structure caused by high external water pressure under construction and maintenance conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the overall cross-section of the artificial hard rock gas storage cavern structure of the compressed air energy storage power station of the present invention.

[0011] Figure 2 yes Figure 1 A detailed enlargement of center A.

[0012] Among them: 1---initial support of the cavern; 2---concrete lining layer; 3---flexible sealing layer; 4---elastic transition layer; 5---prefabricated lightweight concrete assembly layer; 6---assembly type; 7---surrounding rock. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation methods described herein are only used to explain the present invention and are not used to limit the present invention.

[0014] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by terms such as “upper”, “middle”, “lower”, “inside”, “outside”, and “both sides” are based on the orientations or positional relationships shown in the accompanying drawings, and are only simplified descriptions for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0015] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0016] like Figure 1-2 As shown, the artificial hard rock gas storage cavern structure of the compressed air energy storage power station of the present invention, the cavern structure layers are respectively the initial cavern support 1, the concrete lining layer 2, the flexible sealing layer 3, the elastic transition layer 4, and the prefabricated lightweight concrete assembly layer 5 from the outside to the inside. The prefabricated lightweight concrete assembly layer 5 is assembled on-site using lightweight concrete prefabricated blocks to bear the external peripheral rock pressure and external water pressure, and has a thickness of 250 to 300 mm. The elastic transition layer 4 is made of rubber elastic material with a thickness of 10 to 20 mm. It is adhered to the outside of the prefabricated lightweight concrete assembly layer 5 with an adhesive as a filling material between the flexible sealing layer 3 and the prefabricated lightweight concrete assembly layer 5, so that the external water pressure is evenly transmitted to the prefabricated lightweight concrete assembly layer 5.

[0017] The flexible sealing layer 3 is a thin steel plate or a flexible sealing material, which seals the air and also serves as an outer waterproof layer of the cave structure.

[0018] 3. According to the artificial hard rock gas storage cavern structure of the compressed air energy storage power station of claim 1, it is characterized in that the concrete lining layer 2 is concrete or reinforced concrete, with a thickness of 350 to 400 mm, and is re-injected concrete or cast-in-place concrete.

[0019] The initial support 1 is a mesh sprayed concrete layer or a steel frame sprayed concrete layer, with a thickness of 150 to 250 mm, and is in contact with the concrete lining layer 2 .

[0020] The cross-section of the cave structure is a perfect circle.

[0021] The prefabricated lightweight concrete assembly layer 5 is a lightweight concrete material with a certain compressive strength. After being assembled stably by itself, it has a certain self-stabilizing ability. The elastic transition material 4 is connected to the prefabricated lightweight concrete assembly layer 5 by an adhesive. The elastic transition material 4 is in contact with the flexible sealing layer 3. The main material of the prefabricated lightweight concrete assembly layer 5 is lightweight concrete aggregate, which must meet certain compressive strength requirements and is generally 250 to 300 mm thick. The prefabricated lightweight concrete assembly layer 5 is made of prefabricated blocks, assembled on site, and is convenient to construct. After assembly, it has strong self-stabilization. It mainly bears the external surrounding rock pressure and external water pressure. The main function of the concrete lining layer 2 is to transfer the high internal pressure of the cave to the surrounding rock and bear part of the external surrounding rock pressure. The flexible sealing layer 3 is generally a thin steel lining or other flexible sealing material, which is generally thin in thickness and can be welded, sprayed or other construction forms. The main function is to seal the air, and it also serves as the outer waterproof layer of the cave structure. The initial support 1 is a mesh sprayed concrete layer or a steel frame sprayed concrete layer.

[0022] The stress conditions of the above-mentioned cavern structure are as follows:

[0023] Normal operating conditions of the gas storage cavern: high internal pressure directly acts on the flexible sealing layer 3 and is transmitted to the surrounding rock through the concrete lining 2. The flexible sealing layer 3 plays the role of sealing gas and adapts to the deformation of the surrounding rock.

[0024] Construction and maintenance conditions of the gas storage cavern: the external surrounding rock pressure is borne by the concrete lining layer 2 and the prefabricated lightweight concrete assembly layer 5; the flexible sealing layer 3 plays the role of a waterproof layer, and the external water pressure acts on the flexible sealing layer 3 and is transmitted to the prefabricated lightweight concrete assembly layer 5 through the elastic transition layer 4.

[0025] Specifically, the cross-section of the cavern structure is a perfect circle, and the flexible sealing layer 3 can be a thin steel plate or other flexible sealing material, which is generally thin in thickness and can be welded, sprayed or constructed in other forms; the main function of the flexible sealing layer 3 is to seal the air and also serve as the outer waterproof layer of the cavern structure. The prefabricated lightweight concrete assembly layer 5 is a lightweight concrete material with a certain compressive strength and a thickness of generally 250 to 300 mm. It is made of prefabricated blocks and assembled on site, which is convenient to construct. After assembly, it has strong self-stability and mainly bears external peripheral rock pressure and external water pressure; the construction sequence of the structural form is generally 1-2-3-5; if the flexible sealing layer 3 is a welded sealing layer such as a thin steel plate, it can be assembled and constructed simultaneously with the prefabricated lightweight concrete assembly layer 5 in the cavern, and used together as the inner formwork of the concrete lining 2. The construction sequence of the cavern structure is 1-3-5-2. The elastic transition layer 4 is generally made of elastic materials such as rubber, with a thickness of 10 to 20 mm, and is adhered to the outside of the prefabricated lightweight concrete assembly layer 5 with an adhesive; the elastic transition layer 4 is in contact with the flexible sealing layer 3; the elastic transition layer 4 is mainly used as a filling material between the flexible sealing layer 3 and the prefabricated lightweight concrete assembly layer 5, so that the external water pressure can be evenly transmitted to the prefabricated lightweight concrete assembly layer 5. The concrete lining 2 is concrete or reinforced concrete, with a thickness of generally 350 to 400 mm, and can be re-injected concrete or cast concrete; the main function of the concrete lining 2 is to transmit the high internal pressure of the cave to the surrounding rock and bear part of the external surrounding rock pressure. The initial support 1 is a mesh sprayed concrete layer or a steel frame sprayed concrete layer, generally with a thickness of 150 to 250 mm; the initial support 1 is in contact with the concrete lining 2.

[0026] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be considered as the scope of protection of the present invention.

Claims

1. A compressed air energy storage power station artificial hard rock gas storage cavern structure, characterized in that: The cavern structure layers are respectively cavern initial support (1), concrete lining layer (2), flexible sealing layer (3), elastic transition layer (4), and prefabricated lightweight concrete assembly layer (5) from outside to inside. The prefabricated lightweight concrete assembly layer (5) is assembled on site using lightweight concrete prefabricated blocks to bear external peripheral rock pressure and external water pressure, and has a thickness of 250 to 300 mm. The elastic transition layer (4) is made of rubber elastic material with a thickness of 10 to 20 mm. It is adhered to the outside of the prefabricated lightweight concrete assembly layer (5) using an adhesive and serves as a filling material between the flexible sealing layer (3) and the prefabricated lightweight concrete assembly layer (5) so that the external water pressure is evenly transmitted to the prefabricated lightweight concrete assembly layer (5).

2. According to claim 1, the artificial hard rock gas storage cavern structure of the compressed air energy storage power station is characterized in that: The flexible sealing layer (3) is a thin steel plate or a flexible sealing material, which seals the air and also serves as an outer waterproof layer of the cave structure.

3. According to claim 1, the artificial hard rock gas storage cavern structure of the compressed air energy storage power station is characterized in that: The concrete lining layer (2) is concrete or reinforced concrete, has a thickness of 350-400 mm, and is re-injected concrete or cast-in-place concrete.

4. According to claim 1, the artificial hard rock gas storage cavern structure of the compressed air energy storage power station is characterized in that: The initial support (1) is a mesh sprayed concrete layer or a steel frame sprayed concrete layer, with a thickness of 150 to 250 mm, and is in contact with the concrete lining layer (2).

5. The artificial hard rock gas storage cavern structure of a compressed air energy storage power station according to any one of claims 1 to 4, characterized in that: The cross-section of the cave structure is a perfect circle.

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