Underground compressed air energy storage waterproof shock insulation integrated structure and construction method thereof

Abstract

The invention discloses an underground compressed air energy storage waterproof shock insulation integrated structure and a construction method thereof.The structure is arranged in a preset excavation face area and comprises a waterproof shock insulation layer, a lining layer, an isolation layer and a sealing layer which are annularly arranged from outside to inside; the waterproof shock insulation layer is attached to the inner wall of excavation surrounding rock of an excavation face and is formed by spraying a rigid foam polyurethane material. The lining layer is formed by pouring a steel bar bracket and a fiber concrete material, and the fiber concrete material comprises modified polypropylene crude fibers and polymer fine fibers in a preset mass ratio; the isolation layer is formed by spraying an asphalt material on the surface of the lining layer; and the sealing layer is formed by spraying a high polymer material on the surface of the isolating layer. The invention aims to effectively enhance the stability and durability of the underground compressed air energy storage waterproof shock insulation integrated structure.

Description

Technical Field

[0001] The present invention relates to the technical field of underground compressed air energy storage, and in particular to an underground compressed air energy storage waterproof and seismic isolation integrated structure and a construction method thereof. Background Art

[0002] At present, gas storage and energy storage have become important measures to ensure my country's energy security and promote the development of new energy. In particular, the use of underground space to build gas storage will be the key direction of the development of the energy storage industry in the future. However, the construction of compressed air energy storage is still in its early stages, and there are still a series of problems such as insufficient sealing of gas storage, groundwater erosion of reinforced concrete lining in the surrounding rock, and easy damage to facilities in earthquake zones. Therefore, the construction of a new underground compressed air energy storage composite structure is of far-reaching significance.

[0003] The existing invention patent with the patent publication number CN116624223A discloses a compressed air energy storage underground gas storage sealing structure and its manufacturing method. Although a steel bar layer is provided to resist the tensile damage caused by the expansion of concrete under high pressure, the underground compressed air energy storage structure does not consider the air leakage caused by micro cracks, and does not consider the structural damage caused by earthquakes, and the stability and durability of the sealing structure need to be further considered. Therefore, a new underground compressed air energy storage composite structure is needed to solve the above problems. Summary of the invention

[0004] The main purpose of the present invention is to provide an underground compressed air energy storage waterproof and seismic isolation integrated structure and a construction method thereof, aiming to solve the technical problems of stability and durability of existing underground compressed air energy storage sealing structures.

[0005] To achieve the above-mentioned object, the present invention provides an underground compressed air energy storage waterproof and seismic isolation integrated structure, the structure is arranged in a preset excavation surface area, and the structure includes a waterproof and seismic isolation layer, a lining layer, an isolation layer and a sealing layer arranged in a ring shape from outside to inside;

[0006] The waterproof and seismic isolation layer is attached to the inner wall of the excavated surrounding rock of the excavation surface and is sprayed with a rigid foam polyurethane material;

[0007] The lining layer is cast by a steel support and a fiber concrete material, wherein the fiber concrete material comprises modified polypropylene coarse fibers and polymer fine fibers in a preset mass ratio;

[0008] The isolation layer is sprayed on the surface of the lining layer using asphalt material;

[0009] The sealing layer is sprayed on the surface of the isolation layer using a polymer material.

[0010] Optionally, the rigid polyurethane foam material adopts two-component foam plastics A and B, and the volume ratio of the A component foam plastic to the B component foam plastic is 1:1.5 to 1:3, wherein the A component foam plastic consists of toluene diisocyanate, diphenylmethane diisocyanate and polyphenyl polymethylene polyisocyanate, and the B component foam plastic consists of polyol, catalyst, silicone oil, water and foaming agent.

[0011] Optionally, the polymer material is a two-component polyurethane resin composition of A and B, the volume ratio of the A component polyurethane resin composition to the B component polyurethane resin composition is 2:1 to 1:1, the A component polyurethane resin composition consists of a polymer polyol, a plasticizer and an isocyanate, and the B component polyurethane resin composition consists of an organic amine curing agent, a plasticizer, a polymer polyol and a catalyst.

[0012] Optionally, the waterproof and shock-isolating layer has a thickness of 5-10 cm.

[0013] Optionally, the thickness of the lining layer is 50-60 cm.

[0014] Optionally, the thickness of the isolation layer is 2-3 mm.

[0015] Optionally, the sealing layer has a thickness of 5-10 mm.

[0016] Optionally, 1m 3 The mass of modified polypropylene crude fiber in fiber concrete material is 2~15kg, 1m 3 The mass of the polymer fine fibers in the fiber concrete material is 3 to 10 kg; the steel support comprises more than one layer of annular steel frames distributed in a mesh shape, and each annular steel frame is spliced ​​by a plurality of steel segments of a preset length.

[0017] In addition, in order to achieve the above-mentioned purpose, the present invention also provides a method for constructing an underground compressed air energy storage waterproof and seismic isolation integrated structure as described in any one of the above-mentioned items, the method comprising the following steps:

[0018] Step 1: excavating a vertical shaft using a vertical tunneling machine and supporting the shaft using prefabricated segments;

[0019] Step 2: After excavation reaches the specified depth, assemble the TBM and excavate the gas storage cavern in the preset area. The rotation speed and forward speed of the TBM are determined according to the surrounding rock characteristics.

[0020] Step 3, using a high-pressure water gun to clean the excavated surface after excavation, and using a tunnel spraying device with automatic positioning and dosage control to spray the rigid foam polyurethane material, and after the rigid foam polyurethane material solidifies, a waterproof and seismic isolation layer is obtained;

[0021] Step 4: Determine the position of the steel support by supporting the formwork in the waterproof and seismic isolation layer area, then pour the fiber concrete, and remove the formwork after it is completely solidified to obtain the lining layer;

[0022] Step 5: Use an asphalt spray gun to spray perpendicularly to the spraying surface of the lining layer, move at a constant speed, spray to a preset thickness, and obtain an isolation layer after solidification;

[0023] Step 6, using a tough polymer material, using a tunnel spraying device to spray the polymer material on the spraying surface of the isolation layer, and obtaining a sealing layer after solidification. The sealing layer area is used to store the target high-pressure air.

[0024] Optionally, the method includes: after the construction of storing the target high-pressure air is completed, repeating steps 5-6 on the inner surface of the shaft from bottom to top to achieve sealing of the shaft.

[0025] Beneficial effects:

[0026] 1. The underground compressed air energy storage waterproof and seismic isolation integrated structure of the present invention is made by spraying the waterproof and seismic isolation layer with rigid foam polyurethane material, so that the waterproof and seismic isolation layer has buffering and sealing effects, and the waterproof and seismic isolation layer is tightly fitted with the excavated surrounding rock to form a plane, so as to prevent the lining layer from being subjected to stress concentration and evenly transfer the load to the surrounding rock, thereby preventing earthquakes from damaging the underground compressed air energy storage structure; and the lining layer is cast with steel support and fiber concrete material, so that the tensile strength in the lining layer is enhanced, and the generation of microcracks is effectively suppressed; the asphalt layer effectively reduces the effect of the friction between the lining layer and the sealing layer, and can prevent the sealing layer from being greatly deformed due to cracks in the lining layer, thereby reducing its sealing ability, that is, avoiding cracks in the lining layer and causing the sealing layer to fail; the sealing layer is sprayed with polyurethane material, so that the sealing layer has a strong deformation ability and can effectively resist the tensile damage caused by the expansion of the gas storage reservoir.

[0027] 2. The construction method of the underground compressed air energy storage waterproof and seismic isolation integrated structure in the present invention is fast in construction and easy to operate, and can be easily promoted and used widely. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0029] Figure 1 This is a schematic diagram of an underground compressed air energy storage waterproof and seismic isolation integrated structure of the present invention.

[0030] Description of Figure Numbers:

[0031] 1- Excavation surface; 2- Waterproof and seismic isolation layer; 3- Lining layer; 4- Steel support; 5- Isolation layer; 6- Sealing layer; 7- Gas storage chamber

[0032] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that all directional indications (such as up, down, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, in the present invention, the descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0036] Furthermore, the technical solutions between the various embodiments of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] See also Figure 1 The present invention provides a structural schematic diagram of an embodiment of an underground compressed air energy storage waterproof and seismic isolation integrated structure, wherein the structure is arranged in a preset excavation surface 1 area, and the structure includes a waterproof and seismic isolation layer 2, a lining layer 3, an isolation layer 5 and a sealing layer 6 arranged in a ring shape from the outside to the inside.

[0038] The waterproof and seismic isolation layer 2 is made of a rigid foam polyurethane material sprayed on the surface of the excavated surrounding rock in the excavation surface 1, and the rigid foam polyurethane material adopts A and B two-component foam plastics, wherein the A component foam plastic is composed of toluene diisocyanate, diphenylmethane diisocyanate and polyphenyl polymethylene polyisocyanate, and the B component foam plastic is composed of polyol, catalyst, silicone oil, water and foaming agent, and a tunnel spraying device is used to spray to obtain a rigid foam polyurethane material of a preset thickness. The spraying operation can achieve leveling of the surrounding rock. At the same time, the waterproof and seismic isolation layer obtained after the polyurethane material is cured has a certain buffering effect, which can effectively prevent groundwater and reduce the effect of structural damage caused by earthquakes; preferably, the thickness of the waterproof and seismic isolation layer 2 is 5-10 cm. More preferably, the volume ratio of the A component foam plastic to the B component foam plastic is 1:1.5 to 1:3.

[0039] Furthermore, the lining layer 3 is cast by a steel support 4 and a fiber concrete material, wherein the fiber concrete material includes a preset mass ratio of modified polypropylene coarse fiber and polymer fine fiber, and the steel support 4 includes more than one layer of annular steel frames distributed in a mesh shape, and each annular steel frame is spliced ​​by a plurality of steel segments of a preset length. Among them, the support 4 plays a certain supporting effect in the lining layer 3, and the combination of the steel support and the fiber concrete material can improve the tensile strength of the concrete, and the modified polypropylene coarse fiber can limit the development of macro cracks, and the polymer fine fiber can prevent the original defects of the concrete and the expansion of micro cracks, and the lining layer 3 after casting and curing can effectively inhibit the generation of micro cracks. Preferably, the thickness of the lining layer 3 is 50-60 cm. Preferably, 1m 3 The mass of modified polypropylene crude fiber in fiber concrete material is 2-15kg, 1m 3 The mass of polymer fine fibers in the fiber concrete material is 3 to 10 kg.

[0040] Furthermore, the isolation layer 5 is sprayed on the surface of the lining layer 3 using asphalt material. The isolation layer 5 is used to reduce the friction between the lining layer 3 and the sealing layer 6, and can prevent the sealing layer from being greatly deformed due to cracks in the lining layer, thereby reducing its sealing ability. Preferably, the thickness of the isolation layer 5 is 2-3 mm. More preferably, a smooth interface can be formed between the lining layer 3 and the sealing layer 6 by spraying modified asphalt.

[0041] Furthermore, the sealing layer 6 is sprayed on the surface of the isolation layer 5 using a polymer material, wherein the polymer material is a two-component polyurethane resin composition of A and B, and the A component polyurethane resin composition is composed of a polymer polyol, a plasticizer and an isocyanate, and the B component polyurethane resin composition is composed of an organic amine curing agent, a plasticizer, a polymer polyol and a catalyst. The sealing layer 6 obtained after the polymer material is sprayed can effectively prevent the leakage of high-pressure air and has a certain deformation ability and good fatigue resistance. Preferably, the thickness of the sealing layer 6 is 5-10㎜. More preferably, the volume ratio of the A component polyurethane resin composition to the B component polyurethane resin composition is 2:1 to 1:1;

[0042] Furthermore, the air storage chamber 7 is formed inside the sealing layer 6. Generally, the air storage chamber 7 is used to store high-pressure air.

[0043] In addition, in order to better illustrate the structure of the present invention, the following is explained by a specific construction method, and the method includes the following steps:

[0044] Step 1 - Shaft excavation and support: use a vertical tunnel boring machine to excavate the shaft and use prefabricated segments to support the shaft;

[0045] Step 2-Cave excavation: After the shaft is excavated to the specified depth, the TBM is assembled and the gas storage chamber cavern is excavated in the preset area. The rotation speed and forward speed of the TBM are determined according to the surrounding rock characteristics;

[0046] Step 3 - Construction of waterproof and seismic isolation layer: Use high-pressure water gun to clean the excavated surface after excavation to prevent the waterproof and seismic isolation layer from separating from the excavated surface later. When the excavated surface is clean and dry, use tunnel spraying equipment with automatic positioning and dosage control to spray rigid foam polyurethane material, and after the rigid foam polyurethane material solidifies, the waterproof and seismic isolation layer is obtained;

[0047] Step 4 - Lining layer construction: the position and amount of steel support are determined by formwork in the waterproof and seismic isolation layer area, and then fiber concrete is poured. After it is completely solidified, the formwork is removed to obtain the lining layer;

[0048] Step 5 - Construction of isolation layer: the inner surface of lining layer 3 is polished and cleaned to ensure that its inner wall is smooth, and an asphalt spray gun is used to spray to a preset thickness at a constant speed perpendicular to the spraying surface of the lining layer, and the isolation layer is obtained after solidification;

[0049] Step 6 - Construction of the sealing layer, using tough polymer material, using tunnel spraying equipment to spray the polymer material on the spraying surface of the isolation layer, and obtaining the sealing layer after solidification. The air storage chamber is formed inside the sealing layer area, and the air storage chamber is used to store the target high-pressure air.

[0050] Step 7-Shaft sealing: After the construction of storing the target high-pressure air is completed, repeat steps 5-6 from bottom to top on the inner surface of the shaft to achieve the sealing of the shaft.

[0051] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. An underground compressed air energy storage waterproof and seismic isolation integrated structure, characterized in that: The structure is arranged in a preset excavation surface (1) area, and comprises a waterproof and shock-isolating layer (2), a lining layer (3), an isolation layer (5) and a sealing layer (6) arranged in a ring shape from the outside to the inside; The waterproof and shock-isolating layer (2) is attached to the inner wall of the excavated surrounding rock of the excavation surface (1) and is sprayed with a rigid foam polyurethane material; The lining layer (3) is formed by casting a steel support (4) and a fiber concrete material, wherein the fiber concrete material comprises modified polypropylene coarse fibers and polymer fine fibers in a preset mass ratio; The isolation layer (5) is sprayed on the surface of the lining layer (3) using asphalt material; The sealing layer (6) is made of a polymer material sprayed on the surface of the isolation layer (5).

2. The underground compressed air energy storage waterproof and seismic isolation integrated structure according to claim 1 is characterized in that: The rigid polyurethane foam material adopts A and B two-component foam plastics, wherein the volume ratio of the A component foam plastic to the B component foam plastic is 1:1.5-1:3, wherein the A component foam plastic consists of toluene diisocyanate, diphenylmethane diisocyanate and polyphenyl polymethylene polyisocyanate, and the B component foam plastic consists of polyol, catalyst, silicone oil, water and foaming agent.

3. The underground compressed air energy storage waterproof and seismic isolation integrated structure according to claim 1 is characterized in that: The polymer material is a two-component polyurethane resin composition of A and B, the volume ratio of the polyurethane resin composition of component A to the polyurethane resin composition of component B is 2:1 to 1:1, the polyurethane resin composition of component A consists of a polymer polyol, a plasticizer and an isocyanate, and the polyurethane resin composition of component B consists of an organic amine curing agent, a plasticizer, a polymer polyol and a catalyst.

4. The underground compressed air energy storage waterproof and seismic isolation integrated structure according to claim 1 is characterized in that: The thickness of the waterproof and shock-isolating layer (2) is 5-10 cm.

5. The underground compressed air energy storage waterproof and seismic isolation integrated structure according to claim 1 is characterized in that: The thickness of the lining layer (3) is 50-60 cm.

6. The underground compressed air energy storage waterproof and seismic isolation integrated structure according to claim 1 is characterized in that: The thickness of the isolation layer (5) is 2-3 mm.

7. The underground compressed air energy storage waterproof and seismic isolation integrated structure according to claim 1 is characterized in that: The thickness of the sealing layer (6) is 5-10 mm.

8. The underground compressed air energy storage waterproof and seismic isolation integrated structure according to any one of claims 1 to 7, characterized in that: 1m 3 The mass of modified polypropylene crude fiber in fiber concrete material is 2-15kg, 1m 3 The mass of the polymer fine fibers in the fiber concrete material is 3 to 10 kg; the steel support (4) comprises more than one layer of annular steel frames distributed in a mesh shape, and each annular steel frame is spliced ​​by a plurality of steel segments of a preset length.

9. A method for constructing an underground compressed air energy storage waterproof and seismic isolation integrated structure according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: Step 1: excavating a vertical shaft using a vertical tunneling machine and supporting the shaft using prefabricated segments; Step 2: After excavation reaches the specified depth, assemble the TBM and excavate the gas storage cavern in the preset area. The rotation speed and forward speed of the TBM are determined according to the surrounding rock characteristics. Step 3, using a high-pressure water gun to clean the excavated surface after excavation, and using a tunnel spraying device with automatic positioning and dosage control to spray the rigid foam polyurethane material, and after the rigid foam polyurethane material solidifies, a waterproof and seismic isolation layer is obtained; Step 4: Determine the position of the steel support by supporting the formwork in the waterproof and seismic isolation layer area, then pour the fiber concrete, and remove the formwork after it is completely solidified to obtain the lining layer; Step 5: Use an asphalt spray gun to spray perpendicularly to the spraying surface of the lining layer, move at a constant speed, spray to a preset thickness, and obtain an isolation layer after solidification; Step 6, using a tough polymer material, using a tunnel spraying device to spray the polymer material on the spraying surface of the isolation layer, and obtaining a sealing layer after solidification. The sealing layer area is used to store the target high-pressure air.

10. The method for constructing an underground compressed air energy storage waterproof and seismic isolation integrated structure according to claim 9, characterized in that: The method comprises: after the construction of storing the target high-pressure air is completed, repeating steps 5-6 from bottom to top on the inner surface of the shaft to achieve sealing of the shaft.

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