Compressed air energy storage large-diameter artificial chamber gas storage plugging structure and construction method thereof

Abstract

The invention discloses a compressed air energy storage large-diameter artificial chamber gas storage plugging structure and a construction method thereof.According to the plugging structure, a gas storage necking structure and a traffic cavern at an outlet are utilized, pressure is transmitted through the plugging structure, and most of high-pressure gas thrust is transmitted to the necking structure and side wall surrounding rock of the traffic cavern; the plugging reliability is enhanced; the method is suitable for the compressed air energy storage large-diameter artificial chamber gas storage plugging structure, the necking structure and the T-shaped structure are combined through the plugging structure, the plugging concrete is used for bearing pressure, most of high-pressure gas thrust is transmitted to the necking structure tunnel wall and the longitudinal traffic tunnel side wall at the same time, the tunnel wall surrounding rock bearing area is increased, and the plugging effect is improved. According to the blocking structure, the stress mode that bearing is conducted only through the necking structure tunnel wall or the traffic tunnel side wall in the past is changed, the stress mode of the blocking structure is improved, meanwhile, the excavation engineering amount and the concrete pouring engineering amount of the blocking structure are reduced, the engineering cost is saved, and the construction period is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air energy storage, and in particular to a plugging structure of a large-diameter artificial cavern gas storage reservoir for compressed air energy storage and an implementation method thereof. Background Art

[0002] When a large-diameter circular-section chamber is excavated in a hard rock formation as a high-pressure gas storage, a large-volume concrete plugging structure is generally designed at the outlet of the gas storage to balance the longitudinal thrust generated by the high-pressure gas inside the gas storage. At present, the common types of gas storage plugging structures are mainly shrinkage plugging structure and T-shaped plugging structure. The former only considers the reaction force and friction between the surrounding rock of the shrinkage structure cave wall and the plugging structure, and uses the adjustment of the length of the shrinkage structure to balance the thrust of the high-pressure gas, resulting in a large length of the gas storage plugging body and the difficulty in exerting the compressive performance of the concrete; the latter transmits the thrust of the high-pressure gas in the gas storage to the surrounding rock of the side wall of the traffic cave in the vertical direction through a T-shaped structure. The force mode of the plugging structure is better, but when the diameter of the gas storage is large, the plugging structure will consume a huge amount of concrete, and the construction cost of the plugging structure is high. Therefore, it is necessary to seek a plugging structure with a better force mode and can save concrete materials. Combining the shrinkage structure with the T-shaped structure is a very novel solution, which can not only ensure the safety needs of the plugging structure, but also save construction costs. Summary of the invention

[0003] The main purpose of the present invention is to provide a plugging structure for a large-diameter artificial cavern gas storage reservoir for compressed air energy storage and a construction method thereof. This plugging structure combines a contraction structure with a T-shaped structure, and utilizes the sealing concrete to bear pressure, thereby transmitting most of the high-pressure gas thrust to the cavern wall of the contraction structure and the side wall of the longitudinal traffic cavern at the same time, thereby increasing the bearing area of ​​the cavern wall surrounding rock, changing the previous force-bearing mode that only relied on the cavern wall of the contraction structure or the side wall of the traffic cavern to bear the load, improving the force-bearing mode of the plugging structure, and at the same time reducing the excavation engineering volume and concrete pouring engineering volume of the plugging structure, saving engineering costs, and shortening the construction period.

[0004] To achieve the above-mentioned purpose, one of the technical solutions adopted by the present invention is: a plugging structure of a large-diameter artificial cavern gas storage reservoir for compressed air energy storage, which utilizes the traffic cavern at the outlet of the gas storage reservoir 1, transmits pressure through the plugging structure, and transmits most of the high-pressure gas thrust to the constriction structure and the side wall surrounding rock of the traffic cavern to enhance the reliability of the plugging;

[0005] The traffic tunnel comprises three parts: a constriction structure 6, a transverse traffic tunnel 7 and a longitudinal traffic tunnel 3; the transverse traffic tunnel 7 is vertically connected to the longitudinal traffic tunnel 3;

[0006] The constricted structure 6 is a partially truncated cone with different cross-sectional areas at both ends. The gas storage reservoir 1 is connected to the end of the constricted structure 6 with a larger cross-sectional area, and the transverse communication tunnel 7 is connected to the end of the constricted structure 6 with a smaller cross-sectional area.

[0007] A blocking body 2 for blocking the gas storage reservoir 1 is arranged at the traffic tunnel position at the gas storage reservoir outlet;

[0008] An operation and maintenance passage 5 is provided at the bottom of the blocking body 2 , and both ends of the operation and maintenance passage 5 are respectively connected to the gas storage reservoir 1 and the longitudinal traffic tunnel 3 , and a sealing door 10 is provided at the connection position between the operation and maintenance passage 5 and the gas storage reservoir 1 .

[0009] Furthermore, the ratio of the length of the necking structure 6 to the difference between its large and small diameters is 0-2.

[0010] Furthermore, the transverse traffic tunnel 7 is a circular cross-section tunnel structure with a diameter of 5-7m and a length of 1-3m.

[0011] Furthermore, the longitudinal traffic tunnel 3 is a horseshoe-shaped cross-section, the height of the chamber is equal to the diameter of the transverse traffic tunnel 7, and its width is 5-7m.

[0012] Furthermore, the blocking body 2 is in the shape of a pipe and is cast with micro-expansive concrete. The length of the concrete cast in the longitudinal traffic tunnel is greater than the radius of the gas storage reservoir 1 and twice the diameter of the transverse traffic tunnel.

[0013] Furthermore, the top position of the chamber of the sealing body 2 is filled by backfilling the grouting body 8.

[0014] Furthermore, the operation and maintenance passage 5 is L-shaped in plane, circular in cross section, with a diameter of 1-1.5m, and is installed at a position 0.5m away from the bottom of the chamber;

[0015] The operation and maintenance passage is welded from circular steel barrels, with concrete poured on the outside and reinforced ribs 9 tied around the perimeter.

[0016] Furthermore, the sealing door 10 is a convex steel plate sealing door, and the thickness of the sealing door is at least 5 cm.

[0017] Another technical solution adopted by the present invention is: a construction method, which is applicable to the plugging structure of the large-diameter artificial cavern gas storage reservoir for compressed air energy storage, and the method comprises:

[0018] S1. Chamber excavation:

[0019] The longitudinal traffic tunnel 3, the transverse traffic tunnel 7, the constriction structure 6, and the gas storage reservoir 1 are excavated and supported in sequence; the longitudinal traffic tunnel 3, the transverse traffic tunnel 7, and the constriction structure 6 are only provided with initial support, and the gas storage reservoir 1 needs to be poured with secondary lining after the initial support is completed;

[0020] S2. Initial support surface is smooth:

[0021] Smoothing the initial support surfaces of the longitudinal traffic tunnel 3, the transverse traffic tunnel 7 and the shrinkage structure 6, reducing concrete holes caused by the uneven initial support surface when pouring the plugging structure 2, and making the contact between the initial support and the plugging structure more compact;

[0022] S3. Concrete pouring of the first layer of the blocking structure:

[0023] The first layer of concrete is poured at the bottom of the blocking structure 2. The concrete is C30 micro-expansive concrete with a pouring thickness of 0.5m.

[0024] S4. Installation of operation and maintenance channel:

[0025] After the first layer of concrete reaches sufficient structural strength, a circular steel drum is installed and welded on the surface of the first layer of concrete to form an operation and maintenance passage 5, reinforcing ribs 9 are tied around the steel drum, and embedded parts of the sealing door 10 are welded and installed at the corresponding positions;

[0026] S5. Install backfill grouting pipe:

[0027] At the interface between the plugging structure and the surrounding rock, especially at the top of the chamber, a backfill grouting pipe is reserved and installed to facilitate subsequent backfill grouting;

[0028] S6. Layered pouring of blocking structure:

[0029] The sealing door 10 is transported to the gas storage reservoir 1 in advance, and the plugging structure is cast in layers using C30 micro-expansion concrete. The concrete vibration strength is strengthened at the interface between the plugging body and the initial support, and the casting pores are reduced to ensure that the plugging structure 2 can effectively transfer the thrust of the high-pressure gas in the gas storage reservoir 1 to the surrounding rock of the cave wall;

[0030] S7. Concrete maintenance of plugging structure:

[0031] Regularly maintain the cast plugging structure 2 to prevent concrete shrinkage and cracking and ensure that the concrete reaches the expected strength;

[0032] S8, backfill grouting of plugging structure:

[0033] After the blocking structure 2 is poured, there may still be gaps at the junction of the blocking structure and the surrounding rock, especially at the top of the blocking structure and other locations where it is inconvenient to pour concrete. These locations are backfilled and grouted through the backfill grouting pipe to form a backfill grouting body 8;

[0034] S9, Sealed door installation:

[0035] The sealing door 10 is connected and fixed to the sealing door embedded part, and the sealing door protrudes toward the gas storage.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. The present invention combines the existing shrinkage plugging structure with the T-shaped plugging structure, effectively transmitting the thrust of the high-pressure gas in the gas storage reservoir to the shrinkage structure cave wall and the side wall of the longitudinal traffic cave at the same time, increasing the bearing area of ​​the cave wall surrounding rock and improving the reliability of the plugging structure.

[0038] 2. The present invention mainly utilizes the reaction force of the shrinkage structure cave wall and the side wall of the longitudinal traffic cave to balance the thrust of the high-pressure gas in the gas storage reservoir, fully exerts the compressive performance of concrete, improves the force mode of concrete, and avoids the problem of excessive length of the shrinkage sealing structure and excessive concrete consumption of the T-shaped sealing structure.

[0039] 3. The present invention significantly reduces the amount of excavation and concrete pouring of the blocking structure, saves construction costs, and shortens the construction period.

[0040] 4. The present invention designs an operation and maintenance passage formed by welding a circular cross-section steel drum, and at the same time, reinforcing ribs are arranged around the steel drum, which significantly improves the safety of the operation and maintenance passage.

[0041] 5. The sealing door of the present invention adopts a convex steel plate sealing door, the convex direction of which faces the gas storage reservoir, and the geometric structure of the sealing door is more in line with the principle of mechanics. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a plan view of the gas storage and plugging structure in the present invention;

[0043] Figure 2 This is the plan of the gas storage and traffic tunnel;

[0044] Figure 3 for Figure 2 AA section view;

[0045] Figure 4 for Figure 2 BB cross-section diagram;

[0046] Figure 5 is the plan view of the plugging body;

[0047] Figure 6 for Figure 5 CC profile of ;

[0048] Figure 7 for Figure 5 DD profile diagram;

[0049] Figure 8 for Figure 5 EE profile diagram;

[0050] Fig. 9 for Figure 5 FF cross-section diagram;

[0051] In the figure: 1. Gas storage; 2. Sealing body; 3. Longitudinal traffic tunnel; 4. Surrounding rock; 5. Operation and maintenance passage; 6. Reduction structure; 7. Horizontal traffic tunnel; 8. Backfill grouting body; 9. Reinforcement ribs; 10-Sealed door. DETAILED DESCRIPTION

[0052] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0053] Example 1

[0054] like Figure 1-9 As shown, a plugging structure of a large-diameter artificial cavern gas storage reservoir for compressed air energy storage is provided. The plugging structure utilizes the traffic cavern at the outlet of the gas storage reservoir 1 to transmit pressure through the plugging structure, and transmits most of the high-pressure gas thrust to the constriction structure and the side wall surrounding rock of the traffic cavern to enhance the reliability of the plugging.

[0055] The traffic tunnel comprises three parts: a constriction structure 6, a transverse traffic tunnel 7 and a longitudinal traffic tunnel 3; the transverse traffic tunnel 7 is vertically connected to the longitudinal traffic tunnel 3;

[0056] The constricted structure 6 is a partially truncated cone with different cross-sectional areas at both ends. The gas storage reservoir 1 is connected to the end of the constricted structure 6 with a larger cross-sectional area, and the transverse communication tunnel 7 is connected to the end of the constricted structure 6 with a smaller cross-sectional area.

[0057] A blocking body 2 for blocking the gas storage reservoir 1 is arranged at the traffic tunnel position at the gas storage reservoir outlet;

[0058] An operation and maintenance passage 5 is provided at the bottom of the blocking body 2 , and both ends of the operation and maintenance passage 5 are respectively connected to the gas storage reservoir 1 and the longitudinal traffic tunnel 3 , and a sealing door 10 is provided at the connection position between the operation and maintenance passage 5 and the gas storage reservoir 1 .

[0059] Furthermore, the ratio of the length of the necking structure 6 to the difference between its large and small diameters is 0-2.

[0060] Furthermore, the transverse traffic tunnel 7 is a circular cross-section tunnel structure with a diameter of 5-7m and a length of 1-3m.

[0061] Furthermore, the longitudinal traffic tunnel 3 is a horseshoe-shaped cross-section, the height of the chamber is equal to the diameter of the transverse traffic tunnel 7, and its width is 5-7m.

[0062] Furthermore, the blocking body 2 is in the shape of a pipe and is cast with micro-expansive concrete. The length of the concrete cast in the longitudinal traffic tunnel is greater than the radius of the gas storage reservoir 1 and twice the diameter of the transverse traffic tunnel.

[0063] Furthermore, the top position of the chamber of the sealing body 2 is filled by backfilling the grouting body 8.

[0064] Furthermore, the operation and maintenance passage 5 is L-shaped in plane, circular in cross section, with a diameter of 1-1.5m, and is installed at a position 0.5m away from the bottom of the chamber;

[0065] The operation and maintenance passage is welded from circular steel barrels, with concrete poured on the outside and reinforced ribs 9 tied around the perimeter.

[0066] Furthermore, the sealing door 10 is a convex steel plate sealing door, and the thickness of the sealing door is at least 5 cm.

[0067] Example 2

[0068] A construction method, which is applicable to the plugging structure of the large-diameter artificial cavern gas storage reservoir for compressed air energy storage described in the above-mentioned embodiment 1, and comprises:

[0069] S1. Chamber excavation:

[0070] The longitudinal traffic tunnel 3, the transverse traffic tunnel 7, the constriction structure 6, and the gas storage reservoir 1 are excavated and supported in sequence; the longitudinal traffic tunnel 3, the transverse traffic tunnel 7, and the constriction structure 6 are only provided with initial support, and the gas storage reservoir 1 needs to be poured with secondary lining after the initial support is completed;

[0071] S2. Initial support surface is smooth:

[0072] Smoothing the initial support surfaces of the longitudinal traffic tunnel 3, the transverse traffic tunnel 7 and the shrinkage structure 6, reducing concrete holes caused by the uneven initial support surface when pouring the plugging structure 2, and making the contact between the initial support and the plugging structure more compact;

[0073] S3. Concrete pouring of the first layer of the blocking structure:

[0074] The first layer of concrete is poured at the bottom of the blocking structure 2. The concrete is C30 micro-expansive concrete with a pouring thickness of 0.5m.

[0075] S4. Installation of operation and maintenance channel:

[0076] After the first layer of concrete reaches sufficient structural strength, a circular steel drum is installed and welded on the surface of the first layer of concrete to form an operation and maintenance passage 5, reinforcing ribs 9 are tied around the steel drum, and embedded parts of the sealing door 10 are welded and installed at the corresponding positions;

[0077] Specifically, in S4, the maintenance channel is welded by multiple sections of circular steel barrels, and the inside and outside of the steel barrels are welded in a circle to ensure its connection strength; the reinforcement ribs 9 around the steel barrel adopt φ22mm HRB400 circular steel cage, and the steel ring and longitudinal spacing are 0.25m×0.2m.

[0078] S5. Install backfill grouting pipe:

[0079] At the interface between the plugging structure and the surrounding rock, especially at the top of the chamber, a backfill grouting pipe is reserved and installed to facilitate subsequent backfill grouting;

[0080] S6. Layered pouring of blocking structure:

[0081] The sealing door 10 is transported to the gas storage reservoir 1 in advance, and the plugging structure is cast in layers using C30 micro-expansion concrete. The concrete vibration strength is strengthened at the interface between the plugging body and the initial support, and the casting pores are reduced to ensure that the plugging structure 2 can effectively transfer the thrust of the high-pressure gas in the gas storage reservoir 1 to the surrounding rock of the cave wall;

[0082] Specifically, in S6, the pouring order of the blocking structure is the necking structure 6, the transverse traffic tunnel 7 and the longitudinal traffic tunnel 3, and the thickness of each concrete pouring does not exceed 30 cm, and the pouring is done in blocks, sections and batches.

[0083] S7. Concrete maintenance of plugging structure:

[0084] Regularly maintain the cast plugging structure 2 to prevent concrete shrinkage and cracking and ensure that the concrete reaches the expected strength;

[0085] S8, backfill grouting of plugging structure:

[0086] After the blocking structure 2 is poured, there may still be gaps at the junction of the blocking structure and the surrounding rock, especially at the top of the blocking structure and other locations where it is inconvenient to pour concrete. These locations are backfilled and grouted through the backfill grouting pipe to form a backfill grouting body 8;

[0087] Specifically, in S8, the slurry for backfill grouting is micro-expanding cement slurry, the grouting pressure is 0.2~0.5MPa, the grouting pipe is mainly arranged on the top of the sealing structure, and the annular and longitudinal spacing is 1m×1m. The grouting construction is carried out after the concrete of the sealing structure reaches sufficient strength.

[0088] S9, Sealed door installation:

[0089] The sealing door 10 is connected and fixed to the sealing door embedded part, and the sealing door protrudes toward the gas storage.

[0090] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. The large-diameter artificial chamber gas storage plugging structure for compressed air energy storage is characterized by: The plugging structure utilizes the constriction structure (6) of the gas storage reservoir (1) and the traffic tunnel at the outlet, transmits pressure through the plugging structure, and transmits most of the thrust of the high-pressure gas to the constriction structure and the side wall surrounding rock of the traffic tunnel, so as to enhance the reliability of the plugging; The traffic tunnel comprises three parts: a constriction structure (6), a transverse traffic tunnel (7) and a longitudinal traffic tunnel (3); the transverse traffic tunnel (7) is vertically connected to the longitudinal traffic tunnel (3); The constricted opening structure (6) is in the shape of a partially truncated cone with different cross-sectional areas at both ends; the gas storage reservoir (1) is connected to the end of the constricted opening structure (6) with a larger cross-sectional area; and the transverse communication tunnel (7) is connected to the end of the constricted opening structure (6) with a smaller cross-sectional area. A blocking body (2) for blocking the gas storage reservoir (1) is arranged at the traffic tunnel position at the gas storage reservoir outlet; An operation and maintenance passage (5) is provided at the bottom of the blocking body (2), and the two ends of the operation and maintenance passage (5) are respectively connected to the gas storage reservoir (1) and the longitudinal traffic chamber (3), and a sealing door (10) is provided at the connection position between the operation and maintenance passage (5) and the gas storage reservoir (1).

2. The plugging structure of the large-diameter artificial cavern gas storage reservoir for compressed air energy storage according to claim 1 is characterized in that: The ratio of the length of the necking structure (6) to the difference between its large and small diameters is 0-2.

3. The plugging structure of the large-diameter artificial cavern gas storage reservoir for compressed air energy storage according to claim 1 is characterized in that: The transverse traffic tunnel (7) is a circular cross-section tunnel structure with a diameter of 5-7m and a length of 1-3m.

4. The plugging structure of the large-diameter artificial cavern gas storage reservoir for compressed air energy storage according to claim 1 is characterized in that: The longitudinal traffic tunnel (3) has a horseshoe-shaped cross section, the height of the chamber is equal to the diameter of the transverse traffic tunnel (7), and its width is 5-7m.

5. The plugging structure of the large-diameter artificial cavern gas storage reservoir for compressed air energy storage according to claim 1 is characterized in that: The blocking body (2) is in the shape of a tobacco pipe and is cast using micro-expansion concrete. The length of the concrete cast in the longitudinal traffic tunnel is greater than the radius of the gas storage reservoir (1) and twice the diameter of the transverse traffic tunnel.

6. The plugging structure of the large-diameter artificial cavern gas storage reservoir for compressed air energy storage according to claim 1 is characterized in that: The top position of the chamber of the blocking body (2) is filled by backfilling the grouting body (8).

7. The plugging structure of the large-diameter artificial cavern gas storage reservoir for compressed air energy storage according to claim 1 is characterized in that: The operation and maintenance passage (5) is L-shaped in plane, circular in cross section, with a diameter of 1-1.5 m, and is installed at a position 0.5 m away from the bottom of the chamber; The operation and maintenance passage is welded from a circular steel barrel, the outside of which is poured with concrete and reinforced ribs (9) are tied around it.

8. The plugging structure of the large-diameter artificial cavern gas storage reservoir for compressed air energy storage according to claim 1 is characterized in that: The sealing door (10) is a convex steel plate sealing door, and the thickness of the sealing door is at least 5 cm.

9. A construction method, characterized in that: The method is applicable to the plugging structure of the large-diameter artificial cavern gas storage reservoir for compressed air energy storage as described in any one of claims 1 to 8, and the method comprises: S1. Chamber excavation: The longitudinal traffic tunnel (3), the transverse traffic tunnel (7), the constriction structure (6), and the gas storage reservoir (1) are excavated and supported in sequence. The longitudinal traffic tunnel (3), the transverse traffic tunnel (7), and the constriction structure (6) are only provided with initial support, and the gas storage reservoir (1) needs to be poured with secondary lining after the initial support is provided; S2. Initial support surface is smooth: The initial support surfaces of the longitudinal traffic tunnel (3), the transverse traffic tunnel (7) and the shrinkage structure (6) are leveled to reduce concrete holes caused by the uneven initial support surface when pouring the blocking structure (2), so that the contact between the initial support and the blocking structure is more compact; S3. Concrete pouring of the first layer of the blocking structure: Pour the first layer of concrete at the bottom of the blocking structure (2), using C30 micro-expansive concrete with a pouring thickness of 0.5m; S4. Installation of operation and maintenance channel: After the first layer of concrete reaches sufficient structural strength, a circular steel drum is installed and welded on the surface of the first layer of concrete to form an operation and maintenance passage (5), reinforcing ribs (9) are tied around the steel drum, and embedded parts of the sealing door (10) are welded and installed at corresponding positions; S5. Install backfill grouting pipe: At the interface between the sealing structure and the surrounding rock (4), especially at the top of the chamber, a backfill grouting pipe is reserved and installed to facilitate subsequent backfill grouting; S6. Layered pouring of blocking structure: The sealing door (10) is transported to the gas storage reservoir (1) in advance, and the plugging structure is cast in layers using C30 micro-expansive concrete. The concrete vibration strength at the interface between the plugging body and the initial support is strengthened to reduce the casting pores, thereby ensuring that the plugging structure (2) can effectively transmit the thrust of the high-pressure gas in the gas storage reservoir (1) to the surrounding rock of the cave wall; S7. Concrete maintenance of plugging structure: Regularly maintain the cast sealing structure (2) to prevent concrete shrinkage and cracking and ensure that the concrete reaches the expected strength; S8, backfill grouting of plugging structure: After the sealing structure (2) is poured, there may still be gaps at the interface between the sealing structure and the surrounding rock, especially at the top of the sealing structure and other locations where it is inconvenient to pour concrete. These locations are backfilled and grouted through a backfill grouting pipe to form a backfill grouting body (8); S9, Sealed door installation: The sealing door (10) is connected and fixed to the sealing door embedded part, and the sealing door protrudes in the direction toward the gas storage.

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