Splicing sealing structure and artificial chamber gas storage

Abstract

The invention discloses a splicing sealing structure and an artificial chamber gas storage.The splicing sealing structure comprises splicing type linings, a waterproof antifriction layer, a sealing layer and a seam crossing sealing assembly, and every two adjacent splicing type linings are arranged in an attached mode; the inner surfaces of the assembled linings are covered with waterproof antifriction layers, and the waterproof antifriction layers of every two adjacent assembled linings are arranged in an attached mode. The inner surface of the waterproof antifriction layer is covered with a sealing layer, and the sealing layers of every two adjacent spliced linings are arranged in an attached mode and form a sealing layer joint. The cross-seam sealing assembly comprises a sealing gasket, a cross-seam pressing plate and a connecting piece. The artificial chamber gas storage comprises a plurality of prefabricated pipe joint units, and a splicing sealing structure is formed between every two adjacent prefabricated pipe joint units. Compared with the prior art, the splicing sealing structure provided by the invention not only can reduce the complexity of sealing treatment at the joints of the prefabricated pipe joint units, but also can effectively control underground water to infiltrate and erode the gas storage structure, and is beneficial to engineering implementation of an artificial chamber compressed air energy storage technology.

Description

Technical Field

[0001] This invention relates to the field of compressed gas storage technology in artificial chambers, specifically to a spliced ​​sealing structure and an artificial chamber gas storage facility. Background Technology

[0002] Compressed air energy storage in artificial chambers is currently widely regarded as the most promising large-scale energy storage technology. Its core principle is to convert surplus electrical energy from the power grid into internal air energy through a compression energy storage system during charging, and to convert internal air energy into electrical energy through an expansion energy release system during discharging. This enables the absorption of new energy sources, mainly wind and solar power, and improves the peak shaving and valley filling capabilities of the power grid.

[0003] When the storage capacity is fixed, the economic benefits of a compressed air energy storage power station are closely related to the working pressure of the air inside the storage tank. On the one hand, the higher the working pressure, the greater the economic benefits; but on the other hand, ordinary circular steel sealing layers are prone to plastic yielding and increased leakage risk under the high internal pressure environment of the storage tank, and using high-strength steel or increasing the thickness of the steel sealing layer is obviously uneconomical.

[0004] To improve the stress and deformation of the steel sealing layer, irregularly shaped steel sealing layers with several equidistantly distributed arched structures are commonly used to replace circular steel sealing layers, thereby reducing the thickness of the steel sealing layer and saving construction costs. However, the unavoidable rolling and welding errors of the irregularly shaped steel sealing layer will significantly affect the splicing and welding processes between its standard pipe sections, making the joints between the standard pipe sections of the steel sealing layer one of the weakest links in the entire gas storage facility. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a spliced ​​sealing structure and an artificial chamber gas storage tank to solve the technical problems of poor sealing performance and easy leakage between prefabricated pipe sections in the prior art.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a spliced ​​sealing structure, comprising: a modular lining, a waterproof and friction-reducing layer, a sealing layer, and a cross-joint sealing assembly. Two adjacent prefabricated linings are arranged close together. The inner surface of the assembled lining is covered with the waterproof and friction-reducing layer, and the waterproof and friction-reducing layers of two adjacent assembled linings are arranged close together. The inner surface of the waterproof and friction-reducing layer is covered with the sealing layer, and the sealing layers of two adjacent assembled linings are arranged close together to form a sealing layer joint. The cross-joint sealing assembly includes a sealing gasket, a cross-joint pressure plate, and a connector. The sealing gasket is disposed on the inner surface of the sealing layer on both sides of the joint of the sealing layer. The cross-joint pressure plate spans the joint of the sealing layer and is abutted and connected to the sealing gaskets on both sides. The connector passes through the cross-joint pressure plate, the sealing gasket, the sealing layer, and the waterproof and friction-reducing layer in sequence and is fixedly connected to the cross-joint pressure plate and the assembled lining so that the cross-joint pressure plate presses the sealing gasket to achieve a seal.

[0007] In some embodiments, the shapes of the joint portions of two adjacent modular linings are matched to form a modular lining joint.

[0008] In some embodiments, the two assembled linings form multiple pairs of mounting grooves at the joint of the assembled linings, and the mounting grooves are provided with sealing strips.

[0009] In some embodiments, the joints of two adjacent modular linings form a matching stepped structure.

[0010] In some embodiments, a waterproof and friction-reducing layer joint is formed between two adjacent waterproof and friction-reducing layers, and the waterproof and friction-reducing layer joint is arranged alternately with the assembled lining joint and the sealing layer joint.

[0011] In some embodiments, the connectors are arranged symmetrically about the joint of the sealing layer.

[0012] In some embodiments, the connector includes a sleeve nut and a bolt. The sleeve nut is embedded in the assembled lining. The waterproof and friction-reducing layer, the sealing layer, the sealing gasket, and the cross-joint pressure plate have through holes that communicate with the sleeve nut. The bolt passes through each through hole in sequence and is connected to the sleeve nut. The bolt causes the cross-joint pressure plate to press the sealing gasket tightly.

[0013] In some embodiments, the assembled lining is made of reinforced concrete, and the sealing layer and the cross-joint pressure plate are made of steel.

[0014] Secondly, the present invention also provides an artificial chamber gas storage facility, comprising multiple prefabricated pipe section units, wherein the splicing and sealing structure is formed between two adjacent prefabricated pipe section units.

[0015] In some embodiments, the prefabricated pipe section units are arranged sequentially along the length of the artificial gas storage chamber.

[0016] Compared with the prior art, the splicing sealing structure provided by the present invention uses a cross-joint sealing component to connect adjacent prefabricated linings, waterproof and friction-reducing layers and sealing layers. The connector can transmit the fastening force to the sealing gasket more evenly, thereby effectively improving the airtightness of the cross-joint sealing component. This splicing sealing structure can not only reduce the complexity of sealing treatment at the joints of prefabricated pipe sections, but also effectively control the infiltration and erosion of groundwater into the gas storage structure, which is conducive to the engineering implementation of artificial chamber compressed air energy storage technology. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the splicing and sealing structure provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the artificial chamber gas storage facility provided in an embodiment of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0019] To address the technical problem of poor sealing and easy air leakage at the joints between prefabricated pipe sections, this invention provides a splicing sealing structure that can improve the airtightness of the joints.

[0020] It should be noted that the splicing sealing structure described in this invention is used in, but not limited to, artificial chamber gas storage facilities. For ease of explanation, this invention will only use the application of the splicing sealing structure in artificial chamber gas storage facilities as an example. The principle of applying the splicing sealing structure to other types of gas storage facilities is essentially the same as that applied to artificial chamber gas storage facilities, and will not be elaborated here.

[0021] Please see Figure 1 , Figure 1 This is a schematic diagram of the splicing sealing structure provided in an embodiment of the present invention. The splicing sealing structure includes a modular lining 1, a waterproof and friction-reducing layer 2, a sealing layer 3, and a cross-joint sealing assembly 4.

[0022] Two adjacent prefabricated linings 1 are arranged close together. The inner surface of the prefabricated lining 1 is covered with a waterproof and friction-reducing layer 2. The waterproof and friction-reducing layers 2 of two adjacent prefabricated linings 1 are arranged close together. The inner surface of the waterproof and friction-reducing layer 2 is covered with a sealing layer 3. The sealing layers 3 of two adjacent prefabricated linings 1 are arranged close together and form a sealing layer joint.

[0023] The joint sealing assembly 4 includes a sealing gasket 41, a joint pressure plate 42, and a connector 43. The sealing gasket 41 is disposed on the inner surface of the sealing layer 3 on both sides of the joint. The joint pressure plate 42 spans the joint and is abutted against the sealing gasket 41 on both sides. The connector 43 passes through the joint pressure plate 42, the sealing gasket 41, the sealing layer 3, and the waterproof and friction-reducing layer 2 in sequence and is fixedly connected to the joint pressure plate 42 and the assembled lining 1 so that the joint pressure plate 42 presses the sealing gasket 41 to achieve a seal.

[0024] In some embodiments, the shapes of the joint portions of two adjacent prefabricated linings 1 are matched to form a prefabricated lining joint. For example, a standard male-female joint structure can be formed to facilitate the rapid assembly of the prefabricated linings 1 in the artificial chamber, which is also an effective method to check whether the dimensions of the prefabricated linings 1 are up to standard.

[0025] Based on the above embodiment, multiple pairs of mounting grooves are formed at the joint of the two prefabricated linings, and sealing strips 5 are installed in the mounting grooves. The mounting grooves can adopt a rounded rectangular structure, and the sealing strips 5 can be made of friction-resistant EPDM rubber to achieve both sealing performance and durability. The sealing strips 5 not only improve the sealing performance at the joint of the prefabricated lining, but also effectively reduce frictional damage at the joint of the prefabricated lining under the cyclic load of the gas storage tank.

[0026] Based on the above embodiments, the joints between two adjacent prefabricated linings 1 form as follows: Figure 1 The step-shaped structures shown are mutually matching to enable rapid assembly.

[0027] In some embodiments, the prefabricated lining 1 is made of reinforced concrete, which is precast and cast in a factory and then transported to the construction site for assembly.

[0028] In some embodiments, a waterproof friction-reducing layer joint is formed between two adjacent waterproof friction-reducing layers 2. The waterproof friction-reducing layer joint is arranged alternately with the assembled lining joint and the sealing layer joint, but all three are located between the connectors 43 on both sides of the joint.

[0029] Based on the above embodiments, the waterproof and friction-reducing layer 2 is made of friction-resistant EPDM rubber or sprayed rubber asphalt and other polymer materials to extend the service life of the gas storage tank.

[0030] In some embodiments, the steel material of the sealing layer 3 is preferably composite steel to further improve its strength. The friction between the steel sealing layer 3 and the prefabricated concrete lining 1 is relatively high. If the steel sealing layer 3 is in direct contact with the prefabricated concrete lining 1, both will gradually suffer varying degrees of damage during the long-term loading and unloading cycles of the gas storage facility. Furthermore, groundwater infiltration into the gap between them will exacerbate the damage process. When the accumulated damage reaches a certain level, it will significantly affect the normal operation of the gas storage facility. Therefore, a waterproof and friction-reducing layer 2 needs to be installed between the steel sealing layer 3 and the prefabricated concrete lining 1. This layer not only controls groundwater infiltration and erosion but also isolates the steel sealing layer 3 from direct contact with the prefabricated concrete lining 1, thereby effectively reducing the friction experienced by both the steel sealing layer 3 and the prefabricated concrete lining 1, and extending their service life.

[0031] In addition, the steel sealing layer 3 plays a lateral restraint role, which can improve the stress situation of the connector 43 and the assembled lining 1. The steel sealing layer 3 has an elongated hole along the length of the tunnel at the installation location of the connector 43 to facilitate on-site assembly and installation.

[0032] In some embodiments, the sealing gasket 41 is made of materials such as brominated butyl rubber, fluororubber, etc., which are corrosion-resistant, aging-resistant, and have good airtightness. Considering that rubber is a superelastic incompressible material with a Poisson's ratio close to 0.5, the polymer sealing gaskets 41 on both sides of the joint cannot be in direct contact. A space needs to be reserved between them to release the volume deformation of the polymer sealing gasket 41 after compression, so as to reduce the impact of the volume deformation of the polymer sealing gasket 41 on the bolt tightening effect. For this purpose, a certain gap is reserved between the sealing gaskets 41 on both sides of the sealing layer joint, so that the sealing gasket 41 and the joint pressure plate 42 form a cavity 4a covering the sealing layer joint, and the waterproof friction-reducing layer joint and the assembled lining joint are also located at positions corresponding to the cavity 4a.

[0033] Based on the above embodiments, the material of the joint pressure plate 42 is also steel. The steel joint pressure plate 42 can more evenly transmit the fastening force to the polymer sealing gasket 41, thereby effectively improving the airtightness of the joint sealing assembly 4, and can control the infiltration of groundwater into the gas storage tank to a certain extent, thereby improving the airtightness and waterproofness of the entire joint sealing assembly 4.

[0034] In some embodiments, a plurality of connectors 43 are sequentially arranged along the length of the sealing layer joint. These connectors are located on both sides of the sealing layer joint and are arranged symmetrically about the sealing layer joint.

[0035] In the above embodiment, the connector 43 includes a sleeve nut and a bolt. The sleeve nut is embedded in the prefabricated lining 1. The waterproof and friction-reducing layer 2, the sealing layer 3, the sealing gasket 41, and the joint-crossing pressure plate 42 are provided with through holes that connect to the sleeve nut. The bolt passes through each through hole in sequence and connects with the sleeve nut. The bolt causes the joint-crossing pressure plate 42 to press the sealing gasket 41 tightly.

[0036] The cross-joint sealing assembly 4, with its aforementioned structure, improves the uniformity of stress distribution. Although the volume deformation of the polymer sealing gasket 41 under the combined action of the cross-joint pressure plate 42 and bolts can be freely released along the pipe section axis, the outer surface of the polymer sealing gasket 41 bears a large working air pressure while the inner surface only bears atmospheric pressure. This results in a complex stress field distribution for the polymer sealing gasket 41, causing unequal volume deformation release on the inner and outer sides. The non-uniform strain field of the polymer sealing gasket 41, under the combined action of cyclic loading and unloading and friction, is highly likely to affect the bolt tightening effect and, consequently, the compactness of the joint at the concrete prefabricated lining 1. Therefore, the sealing layer 3 here primarily functions as a stress adjuster and transfer layer, which can, to a certain extent, homogenize the stress on the polymer sealing gasket 41 and transfer a more uniform stress to the concrete prefabricated lining 1.

[0037] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of the artificial chamber gas storage facility provided in an embodiment of the present invention.

[0038] This artificial chamber gas storage facility includes multiple prefabricated pipe section units 6, and the above-mentioned splicing and sealing structure is formed between two adjacent prefabricated pipe section units 6.

[0039] In a preferred embodiment, the prefabricated pipe section units 6 are arranged sequentially along the length of the artificial gas storage chamber.

[0040] It is easy to understand that each prefabricated pipe section unit 6 includes the above-mentioned assembled lining 1, waterproof and friction-reducing layer 2 and sealing layer 3. Adjacent prefabricated pipe section units 6 are connected by a cross-seam sealing assembly 4, thereby forming the splicing sealing structure between adjacent prefabricated pipe section units 6.

[0041] The construction method of this artificial chamber gas storage facility is as follows: In the prefabrication plant, the prefabricated lining 1 is cast. During the casting process, corresponding molds are set at both ends of the prefabricated lining 1 in the axial direction to form matching joint structures. Sleeve nuts are pre-embedded in the joint structures, and installation grooves are opened.

[0042] After transporting the prefabricated lining 1 to the corresponding location in the gas storage facility, the sealing strip 5 is installed in the installation groove, and then the prefabricated lining 1 is assembled.

[0043] A waterproof and friction-reducing layer 2 is sprayed inside the prefabricated lining 1, and corresponding holes are opened at the corresponding positions of the pre-embedded sleeve nuts. The joints of the waterproof and friction-reducing layer 2 are staggered from the joints of the concrete prefabricated lining 1.

[0044] A steel sealing layer 3 is welded inside the waterproof and friction-reducing layer 2, and corresponding holes are opened at the corresponding positions of the pre-embedded sleeve nuts to obtain a standard prefabricated pipe section unit 6, and the joints of the steel sealing layer 3 are staggered from the joints of the waterproof and friction-reducing layer 2.

[0045] After the prefabricated pipe section unit 6 is assembled and positioned in the tunnel, the sealing gasket 41, the cross-joint pressure plate 42 and the connector 43 are installed at the pre-embedded sleeve nut position to form the cross-joint sealing assembly 4.

[0046] This invention, through a collaborative design of "bolt tightening + controlled volume deformation + stress homogenization + reduced friction loss," constructs a weld-free sealing structure for the joints of standard prefabricated pipe section units 6 in gas storage facilities. This sealing structure not only reduces the complexity of sealing the joints of standard prefabricated pipe section units 6, but also effectively controls groundwater infiltration and erosion of the gas storage structure, facilitating the engineering implementation of artificial chamber compressed air energy storage technology.

[0047] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Any other corresponding changes and modifications made based on the technical concept of this invention should be included within the scope of protection of the claims of this invention.

Claims

1. A splicing sealing structure, characterized in that, include: Prefabricated lining, with two adjacent prefabricated linings arranged close together; A waterproof and friction-reducing layer is provided, which covers the inner surface of the assembled lining, with the waterproof and friction-reducing layers of two adjacent assembled linings arranged in close contact. A sealing layer, the inner surface of the waterproof and friction-reducing layer is covered by the sealing layer, and the sealing layers of two adjacent assembled linings are arranged close together to form a sealing layer joint; A joint sealing assembly includes a sealing gasket, a joint pressure plate, and a connector. The sealing gasket is disposed on the inner surface of the sealing layer on both sides of the joint. The joint pressure plate spans the joint and is abutted against the sealing gaskets on both sides. The connector passes through the joint pressure plate, the sealing gasket, the sealing layer, and the waterproof and friction-reducing layer in sequence and is fixedly connected to the joint pressure plate and the assembled lining, so that the joint pressure plate presses the sealing gasket to achieve a seal.

2. The splicing sealing structure according to claim 1, characterized in that, The shapes of the joints of two adjacent prefabricated linings are matched to form a prefabricated lining joint.

3. The splicing sealing structure according to claim 2, characterized in that, The two assembled linings have multiple pairs of mounting grooves at the joint of the assembled lining, and the mounting grooves are provided with sealing strips.

4. The splicing sealing structure according to claim 2, characterized in that, The joints of two adjacent prefabricated linings form a matching stepped structure.

5. The splicing sealing structure according to claim 2, characterized in that, A waterproof and friction-reducing layer joint is formed between two adjacent waterproof and friction-reducing layers, and the waterproof and friction-reducing layer joint is arranged alternately with the assembled lining joint and the sealing layer joint.

6. The splicing sealing structure according to claim 1, characterized in that, The connectors are arranged symmetrically about the joint of the sealing layer.

7. The splicing sealing structure according to claim 1, characterized in that, The connector includes a sleeve nut and a bolt. The sleeve nut is embedded in the assembled lining. The waterproof and friction-reducing layer, the sealing layer, the sealing gasket, and the cross-joint pressure plate have through holes that connect to the sleeve nut. The bolt passes through each through hole in sequence and connects to the sleeve nut. The bolt causes the cross-joint pressure plate to press the sealing gasket tightly.

8. The splicing sealing structure according to claim 1, characterized in that, The assembled lining is made of reinforced concrete, and the sealing layer and the cross-joint pressure plate are made of steel.

9. An artificial chamber gas storage facility, characterized in that, It includes multiple prefabricated pipe section units, and a splicing and sealing structure as described in any one of claims 1-8 is formed between two adjacent prefabricated pipe section units.

10. The artificial chamber gas storage facility according to claim 9, characterized in that, The prefabricated pipe section units are arranged sequentially along the length of the artificial gas storage chamber.

Images