CN218720585U

CN218720585U - Sealing structure for underground rock cavern gas storage

Info

Publication number: CN218720585U
Application number: CN202222593534.2U
Authority: CN
Inventors: 刘天泉; 梁大庆; 王学杰
Original assignee: Hunan Kuaidiwei Network Technology Co ltd
Current assignee: Hunan Kuaidiwei Network Technology Co ltd
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2023-03-24
Anticipated expiration: 2032-09-29

Abstract

The utility model discloses a seal structure of underground cavern gas storage, from outer to interior in proper order including spraying the spraying concrete layer outside the rock mass, self-adhesion coiled material waterproof layer, impervious concrete screed-coat, priming paint layer, glass steel sealing layer and reinforcing stratum reticulare, the outer spraying of reinforcing stratum reticulare has the polyurea sealing layer for glass steel sealing layer and polyurea sealing layer form elastic seal structure, and elastic seal structure surrounds formation gas storage chamber. An anchoring piece is arranged between the impervious concrete leveling layer and the glass fiber reinforced plastic sealing layer, the glass fiber reinforced plastic sealing layer and the polyurea sealing layer are fixed through the anchoring piece, one end of the anchoring piece stretches into the impervious concrete leveling layer, and the other end of the anchoring piece stretches into the glass fiber reinforced plastic sealing layer and the polyurea sealing layer. And a plurality of anchoring pieces are uniformly distributed along the circumferential direction of the impermeable concrete leveling layer. Through spraying the polyurea sealing layer in the glass steel sealing layer, the glass steel that utilizes the high anti elasticity of polyurea can avoid appearing filling repeatedly and deflating and lead to drops the swell phenomenon, can guarantee its sealed effect.

Description

Sealing structure for underground rock cavern gas storage

Technical Field

The utility model relates to a compressed air energy storage facility technical field specifically is a seal structure of underground cavern gas storage.

Background

The compressed air energy storage power station of the underground gas storage is mainly matched with wind energy, tidal energy and hydroelectric energy, redundant electric energy in the power grid during the low ebb of the power load is converted into potential energy of compressed air to be stored in the underground gas storage, the compressed air is released to generate power during the peak period of power utilization, the effect of a storage battery is achieved, and the functions of peak clipping and valley filling, power grid optimization and emergency standby are achieved in a power system.

At present, the underground cavern gas storage is generally in a circular structure and is sealed by a concrete first lining, a waterproof material, a second lining and a sealing material in sequence. The recommended sealing material with good sealing performance, high strength and good durability is glass fiber reinforced plastic, and the Chinese patent with the publication number of CN105905512B discloses an anti-drop structure for the wall of an underground rock cavern gas storage cavity of an energy storage power station. The construction process generally adopts the whole process of manually pasting layer by layer on site, and no treatment is carried out between layers. In order to ensure the air tightness of the glass fiber reinforced plastics, the glass fiber reinforced plastics are not embedded into the surface cracks of the concrete under the action of high internal pressure, and the glass fiber reinforced plastics generally need to be thicker, at least 2cm thick and higher in cost. Concrete and glass fiber reinforced plastic are susceptible to delamination under internal air pressure and temperature cycling, external water pressure and temperature cycling, which can lead to extensive overall delamination once locally delaminated, resulting in seal failure. The elastic modulus and the thermal expansion coefficient of the glass fiber reinforced plastic and the concrete are not consistent, and the contact surface of the glass fiber reinforced plastic and the concrete can have an extreme working condition of-15 ℃ to 50 ℃ due to internal and external environments, so that the glass fiber reinforced plastic and the concrete generate certain deformation difference, and further, the staggered layer is generated. On the basis of the anti-disengaging structure, the Chinese patent with the publication number of CN210285557U discloses an anti-disengaging structure for the wall of an underground rock cavern air storage cavity, wherein a lining concrete layer and a glass fiber reinforced plastic sealing layer are fixed through anchoring pieces, an expansion joint is formed in the lining concrete layer along the circumferential direction, a resin layer is filled in the expansion joint, and the position, corresponding to the expansion joint, of the glass fiber reinforced plastic sealing layer is inwards sunken to form a ring protrusion. The sealing layer is basically not delaminated and staggered with a concrete layer, but by adopting the sealing layer, the glass fiber reinforced plastic is brittle and is repeatedly inflated and deflated, so that the glass fiber reinforced plastic is easy to break, the glass fiber reinforced plastic breaks to cause the aluminum foil to break, and the air leakage phenomenon is easy to occur.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a seal structure of underground cavern gas storage to solve current underground gas storage structure and fill the fragile problem in the gassing back of breathing repeatedly.

In order to achieve the above object, the utility model provides a following technical scheme: the sealing structure comprises a sprayed concrete layer, a self-adhesive coiled material waterproof layer, an impervious concrete leveling layer, a primer layer, a glass fiber reinforced plastic sealing layer and a reinforced mesh layer which are sprayed outside a rock body from outside to inside in sequence, wherein a polyurea sealing layer is sprayed outside the reinforced mesh layer, so that the glass fiber reinforced plastic sealing layer and the polyurea sealing layer form an elastic sealing structure, and the elastic sealing structure surrounds to form a gas storage cavity.

As a further improvement of the above technical solution:

an anchoring piece is arranged between the impervious concrete leveling layer and the glass fiber reinforced plastic sealing layer, the glass fiber reinforced plastic sealing layer and the polyurea sealing layer are fixed through the anchoring piece, one end of the anchoring piece stretches into the impervious concrete leveling layer, and the other end of the anchoring piece stretches into the glass fiber reinforced plastic sealing layer and the polyurea sealing layer.

And a plurality of anchoring pieces are uniformly distributed along the circumferential direction of the impervious concrete leveling layer.

The impervious concrete screed-coat has seted up the expansion joint along circumference, it has the resin layer to fill in the expansion joint, the position that glass steel sealing layer and expansion joint correspond inwards caves in and forms the ring suddenly.

The glass fiber reinforced plastic sealing layers are at least two, and a reinforcing mesh layer is arranged between every two adjacent glass fiber reinforced plastic sealing layers.

The thickness of the polyurea sealing layer is 2-4 mm.

The thickness of the glass fiber reinforced plastic sealing layer is 6-20 mm.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses a seal structure of underground cavern gas storage is through spraying the polyurea sealing layer in the glass steel sealing layer, and the glass steel that utilizes the high anti elasticity of polyurea can avoid appearing filling repeatedly and deflating and lead to drops the swell phenomenon to guarantee its sealed effect. Meanwhile, the deformation difference caused by the inconsistent elastic modulus and thermal expansion coefficient of the glass fiber reinforced plastic and the concrete can be avoided through the structural design of the expansion joint.

Drawings

FIG. 1 is a schematic view of the vertical section structure of the sealing structure for underground cavern gas storage of the utility model;

figure 2 is the utility model discloses the cross section structure schematic diagram of the seal structure of underground cavern gas storage.

Reference numerals: 1. a rock mass; 10. a gas storage cavity; 11. a ring protrusion; 12. a resin layer; 13. an expansion joint; 2. spraying a concrete layer; 3. a self-adhesive coiled material waterproof layer; 4. an impervious concrete leveling layer; 5. an anchoring member; 6. a primer layer; 7. a glass fiber reinforced plastic sealing layer; 8. a reinforcing mesh layer; 9. a polyurea sealing layer.

Detailed Description

In order to make the utility model realize, the technical means, the creation characteristics, the achievement purpose and the efficacy are easy to understand and understand, the utility model is further explained by combining the specific implementation mode.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element to which the reference is made must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, and for example, "connected" may be either fixedly connected or detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1 and fig. 2, the sealing structure for gas storage of an underground rock cavern of this embodiment sequentially includes, from outside to inside, a sprayed concrete layer 2 sprayed outside a rock mass 1, a self-adhesive coiled material waterproof layer 3, an impervious concrete leveling layer 4, a primer layer 6, a glass fiber reinforced plastic sealing layer 7, a reinforced mesh layer 8, and a polyurea sealing layer 9, and the polyurea sealing layer 9 surrounds to form a gas storage cavity 10. The combination of the glass fiber reinforced plastic sealing layer 7 and the polyurea sealing layer 9 forms an elastic sealing structure to realize the sealing of gas. The self-adhesive coiled material waterproof layer 3 and the impervious concrete leveling layer 4 are adopted to seal the rock cavern base layer, so that formation of back water pressure is avoided. In a moist and low-temperature environment of a cave, the high-permeability bonding primer layer 6 is adopted, so that the environment can be adapted to be quickly cured, and the bonding force between the glass fiber reinforced plastic sealing layer 7 and the impervious concrete leveling layer 4 is improved. The glass fiber reinforced plastic sealing layer 7 can also be riveted with concrete by adopting a 2mm glass fiber reinforced plastic rivet, then an epoxy glass fiber reinforced plastic layer with the thickness of 4-6 mm is manufactured on the glass fiber reinforced plastic plate, and then polyurea materials are sprayed. The reinforced net layer 8 can be cancelled, polyurea is directly sprayed on the glass fiber reinforced plastic, and the polyurea high-elasticity-resistant sealing coating is sprayed on the surface of the glass fiber reinforced plastic sealing layer 7, so that the times of manual coating are reduced, and the risk of delamination caused by accidental pollution of a base surface and long time interval in the process of multiple coating is reduced. And a smooth and flat sealing layer is formed, so that the damping of the gas can be reduced. The polyurea high-elasticity-resistant sealing coating has high tensile strength, can make up the rigidity defect of a glass fiber reinforced plastic layer, and provides a secondary barrier for the airtightness of the wall of the gas storage cavity. An anchoring piece 5 is arranged between the impervious concrete leveling layer 4 and the glass fiber reinforced plastic sealing layer 7. The impervious concrete leveling layer 4, the glass fiber reinforced plastic sealing layer 7 and the polyurea sealing layer 9 are anchored by the anchoring piece 5, so that delaminating and staggering can be avoided. In order to improve the anchoring effect, the anchoring part is designed into a ring shape and is uniformly distributed along the circumferential direction of the impervious concrete leveling layer 4.

The thickness of the glass fibre reinforced plastic sealing layer 7 is 2mm. The polyurea sealing layer 9 has a thickness of 6mm.

The gas storage cavity 10 is cut in the underground rock body 1, the glass fiber reinforced plastic layer 7 is made by coating three cloth and five coatings on site, and the reinforcing mesh 8 is embedded in the coating of the glass fiber reinforced plastic layer 7.

The polyurea sealing layer 9 is formed by spraying on site by special spraying equipment with high temperature and high pressure.

The glass fiber reinforced plastic sealing layer 7 and the polyurea sealing layer 9 are fixed through the anchoring piece 5, and delamination and dislocation are avoided. One end of the anchoring piece 5 extends into the impervious concrete leveling layer 4, and the other end of the anchoring piece 5 extends into the glass fiber reinforced plastic layer 7 and the high-resistance elastic sealing coating 9. The anchoring piece is arranged in an annular shape, the anchoring piece is uniformly distributed along the circumferential direction of the impervious concrete leveling layer, and the outer surface of the steel nail is coated with a high-strength glue layer.

Expansion joints 13 are arranged along the circumferential direction of the impervious concrete leveling layer 4, resin layers 12 are filled in the expansion joints 13, and the positions of the glass fiber reinforced plastic layers 7 and the high-resistance elastic sealing coatings 9 corresponding to the expansion joints 13 are inwards sunken to form ring protrusions 11. The concrete layer above and below the expansion joint extrudes the resin layer, so that the resin expands towards the circumferential direction, the annular protrusion 11 is formed, and the deformation difference caused by the inconsistency of the elastic modulus and the thermal expansion coefficient of the glass fiber reinforced plastic and the concrete can be eliminated.

The composite protection structure for the wall of the gas storage cavity of the underground rock cavern is firm in bonding, strong in tensile strength and good in seepage prevention effect, and compared with the traditional construction, the thickness of the composite glass fiber reinforced plastic is reduced by half, so that the durability and the safety which are better than those of the glass fiber reinforced plastic with the traditional thickness can be obtained.

The above description is only an example of the present invention, and the common general knowledge of the known specific structures and characteristics of the schemes is not described herein. It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a seal structure of underground rock cavern gas storage, from outside to inside in proper order including spraying outside rock mass (1) spray concrete layer (2), self-adhesion coiled material waterproof layer (3), impervious concrete screed-coat (4), priming paint layer (6), glass steel sealing layer (7) and reinforcing stratum reticulare (8), its characterized in that: polyurea sealing layers (9) are sprayed outside the reinforced net layers (8), so that the glass fiber reinforced plastic sealing layers (7) and the polyurea sealing layers (9) form an elastic sealing structure, and the elastic sealing structure surrounds to form a gas storage cavity (10).

2. The sealing structure for gas storage of the underground cavern as claimed in claim 1, wherein: an anchoring piece (5) is arranged between the impervious concrete leveling layer (4) and the glass fiber reinforced plastic sealing layer (7).

3. The sealing structure for gas storage of the underground cavern as claimed in claim 2, wherein: and a plurality of anchoring pieces (5) are uniformly distributed along the circumferential direction of the impervious concrete leveling layer (4).

4. The sealing structure for gas storage of an underground rock cavern according to claim 3, characterized in that: expansion joints (13) have been seted up along circumference in impervious concrete screed-coat (4), it has resin layer (12) to fill in expansion joints (13), the position that glass steel sealing layer (7) and expansion joints (13) correspond inwards caves in and forms suddenly (11).

5. The sealing structure for gas storage of the underground cavern as claimed in claim 4, wherein: the glass fiber reinforced plastic sealing layers (7) are at least two layers, and a reinforcing net layer (8) is arranged between the adjacent glass fiber reinforced plastic sealing layers (7).

6. The sealing structure for gas storage of the underground cavern as claimed in claim 5, wherein: the thickness of the polyurea sealing layer (9) is 2-4 mm.

7. The sealing structure for gas storage of the underground cavern as claimed in claim 6, wherein: the thickness of the glass fiber reinforced plastic sealing layer (7) is 6-20 mm.