Chamber plug structure and construction method thereof

Abstract

The invention relates to the technical field of underground high-pressure chambers, in particular to a chamber plug structure and a construction method thereof.The chamber plug structure comprises a gas storage chamber, a maintenance chamber arranged on one side of the gas storage chamber and a chamber plug, the maintenance chamber is in a hollow cylindrical shape, one end of the maintenance chamber is connected with the gas storage chamber, and the other end of the maintenance chamber is connected with the gas storage chamber; the chamber plug comprises a pressure beam, a plurality of pre-stressed anchor rods and a concrete layer. The pressure of the pressure beam on the overhaul chamber is increased through the prestress of the prestressed anchor rod, the friction force between the chamber plug and the overhaul chamber is increased, then the prestressed anchor rod, the pressure beam and the inner wall of the overhaul chamber are connected into a whole through the concrete layer, the friction force and cohesive force of the chamber plug on the overhaul chamber are increased, and the overhaul chamber is protected. The complete chamber plug formed in this way is of a prestress composite structure, the shearing resistance of the gas storage chamber is remarkably improved, the length of the overhaul chamber can be shortened, the excavated volume is reduced, the concrete consumption is reduced, and construction is easy.

Description

Technical Field

[0001] The present invention belongs to the technical field of underground high-pressure chambers, and particularly relates to a plug structure for a chamber and a construction method thereof. Background Art

[0002] In the project of deep underground high-pressure gas storage chambers, the plugging structure of the construction passage needs to balance the longitudinal thrust along the passage generated by the high-pressure gas inside the gas storage cavity, and also take into account the reserved requirements of the later maintenance passage. At present, the conventional design of the chamber plug uses a concrete plugging body, and its key anti-thrust mechanism depends on the cohesion between the plugging body and the inner wall interface of the chamber. The stress mode is single, and it is easy to cause the risk of interface slip instability. Therefore, the length of the plugging body is often extended to meet the anti-slip safety requirements, resulting in a large amount of work and low engineering economy.

[0003] To improve the ability of the plug to resist the pressure in the high-pressure chamber, CN119412153A discloses a plug structure in the shape of a wedge, which improves the shear resistance of the plug to resist the internal pressure thrust in the high-pressure chamber by changing the shape of the plug. However, the construction of the wedge-shaped plug is difficult, and it is easy to cause cracking of the inner wall of the chamber; CN219529088U discloses a T-shaped plug structure, which still mainly relies on cohesion to resist the internal pressure thrust in the high-pressure gas storage chamber, and the T-shaped plug needs to solve the stress concentration problem of the concrete at the T-shaped joint, and the construction is difficult. Therefore, the plug structures in the prior art all need to be further optimized. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a plug structure for a chamber and a construction method thereof, which improve the friction between the chamber plug and the inner wall of the maintenance chamber to resist the internal pressure thrust in the gas storage chamber and reduce the amount of work, form a plug for the chamber in the form of a prestressed composite structure, further improve the safety of the chamber plug, and have low construction difficulty.

[0005] The present invention provides the following technical solutions: A plug structure for a chamber, including a gas storage chamber, a maintenance chamber provided on one side of the gas storage chamber, and a chamber plug. The maintenance chamber is in a hollow cylindrical shape and is connected to the gas storage chamber at one end. The chamber plug includes a pressure beam, a plurality of prestressed anchor rods, and a concrete layer;

[0006] The pressure beam includes a plurality of beam bodies, the beam bodies extend along the axial direction, and the plurality of beam bodies are circumferentially spaced along the inner peripheral wall of the maintenance chamber. The prestressed anchor rods penetrate through the beam bodies and the inner wall surface of the maintenance chamber in the radial direction. Each beam body is correspondingly provided with the prestressed anchor rods that are axially spaced in sequence. The beam bodies are fixedly connected to the maintenance chamber through the prestressed anchor rods;

[0007] The concrete layer is arranged to enclose along the inner peripheral wall of the maintenance chamber, covering the pressure beam and the prestressed anchor rods. One side of the concrete layer extends to connect with the gas storage chamber, and the concrete layer encloses and defines a maintenance passage.

[0008] Preferably, the pressure beam includes three beam bodies, which are respectively arranged at intervals on both sides and the bottom of the maintenance chamber.

[0009] Preferably, multiple prestressed anchor rods on the beam body are fixedly arranged at uniform intervals along the axial direction.

[0010] Preferably, the distance between two adjacent prestressed anchor rods on the beam body is 1.2 - 2.0 m.

[0011] Preferably, the beam body includes a beam main body and protrusions. The beam main body extends along the axial direction, and multiple protrusions are arranged at intervals on both sides of the beam main body. The prestressed anchor rods are connected to the beam main body.

[0012] Preferably, the prestressed anchor rod includes a rod body and a backing plate. The backing plate is located at one end of the rod body. The rod body penetrates through both sides of the maintenance chamber and the beam body, and the backing plate is attached to the inner wall surface of the beam body.

[0013] Preferably, a maintenance opening communicating with the maintenance passage is formed on the side wall of the gas storage chamber. The chamber plug structure further includes a sealing door, which is movably covered at the maintenance opening.

[0014] The present invention also provides a construction method for a chamber plug structure, including:

[0015] S1. Start to dig a construction access tunnel from the ground. The construction access tunnel communicates with one side of the gas storage chamber, and the part of the tunnel body connecting the construction access tunnel and the gas storage chamber is excavated into a hollow cylindrical shape. Three beam bodies are cast in place along the axial direction on the middle parts of both sides and the bottom of the tunnel wall with concrete.

[0016] S2. After the beam bodies reach the required hardness, drill holes from the inner wall surface of the beam main body towards the inner wall of the construction access tunnel. A certain number of holes are drilled at intervals on each beam main body. Calculate the required frictional force according to the gas thrust of the gas storage chamber to obtain the number of prestressed anchor rods to be set, and then determine the specific number of drilled holes. Each prestressed anchor rod corresponds to a hole and penetrates through both sides of the beam main body along the radial direction and inserts into the inner wall of the construction access tunnel. The backing plate is attached to the inner wall surface of the beam body. After the prestressed anchor rod is prestressed, the nut is fixed on the inner side of the backing plate to tighten the prestressed anchor rod.

[0017] S3. Pour a concrete layer that wraps the beam body, prestressed anchor rods, and the inner wall of the construction access tunnel, leaving a maintenance passage reserved. One side of the concrete layer extends to connect with the gas storage chamber, and a maintenance opening is reserved at the connection between the gas storage chamber and the concrete layer;

[0018] S4. Install a sealing door on the concrete layer on one side of the maintenance opening.

[0019] The beneficial effects of the present invention compared with the prior art are as follows:

[0020] In the present invention, the prestress of the prestressed anchor rods increases the pressure of the pressure beam on the maintenance chamber, increasing the friction between the chamber plug and the maintenance chamber. Then, the concrete layer connects the prestressed anchor rods, the pressure beam, and the inner wall of the maintenance chamber into a whole, increasing the friction and cohesion of the chamber plug to the maintenance chamber. The complete chamber plug formed in this way is a prestressed composite structure, significantly improving the shear resistance of the gas storage chamber, which can shorten the length of the maintenance chamber, reduce the excavation volume, and decrease the concrete consumption; the chamber plug structure of the present invention is simple, the layout of the pressure beam is of low difficulty, the excavation of the maintenance chamber is of low difficulty, and the construction is simple. Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the chamber plug structure of this application;

[0022] Figure 2 is Figure 1 the schematic diagram of the A-A section in

[0023] Figure 3 is Figure 1 the schematic diagram of the B-B section in

[0024] In the figure:

[0025] 1. Gas storage chamber; 2. Maintenance chamber; 21. Maintenance opening; 3. Chamber plug; 31. Pressure beam; 311. Beam body; 3111. Beam main body; 3112. Protrusion; 32. Prestressed anchor rod; 321. Rod body; 322. Base plate; 33. Concrete layer; 331. Maintenance passage; 4. Sealing door. Detailed Embodiments

[0026] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0027] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0028] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a replaceable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0029] Combined with Figures 1-3 As shown, a structure of a chamber plug 3 includes a gas storage chamber 1, a maintenance chamber 2 provided on one side of the gas storage chamber 1, and a chamber plug 3. The maintenance chamber 2 is in a hollow cylindrical shape and is connected to the gas storage chamber 1 at one end. The chamber plug 3 includes a pressure beam 31, a plurality of prestressed anchor bolts 32, and a concrete layer 33. The pressure beam 31 includes a plurality of beam bodies 311. The beam bodies 311 extend along the axial direction, and the plurality of beam bodies 311 are circumferentially spaced along the inner peripheral wall of the maintenance chamber 2. The prestressed anchor bolts 32 penetrate through the beam bodies 311 and the inner wall surface of the maintenance chamber 2 in the radial direction. Each of the beam bodies 311 is correspondingly provided with the prestressed anchor bolts 32 that are axially spaced in sequence. The beam bodies 311 are fixedly connected to the maintenance chamber 2 through the prestressed anchor bolts 32. The concrete layer 33 is arranged to enclose along the inner peripheral wall of the maintenance chamber 2 and covers the pressure beam 31 and the prestressed anchor bolts 32. One side of the concrete layer 33 extends to be connected to the gas storage chamber 1, and the concrete layer 33 encloses and defines a maintenance passage 331.

[0030] In this embodiment, the pressure beam 31 is made of concrete. Multiple prestressed anchor bolts 32 fix the pressure beam 31 and penetrate deep into the inner wall of the maintenance chamber 2, and prestress is applied to make the pressure beam 31 tightly press against the inner wall of the maintenance chamber 2. This pressure significantly increases the friction force between the chamber plug 3 and the maintenance chamber 2, which serves as the main source of the shear resistance of the chamber plug 3 against the internal pressure in the high-pressure gas storage chamber 1, effectively solving the problem of the excessive length of the chamber plug 3 caused by the existing chamber plug 3 relying solely on cohesion to resist the internal pressure thrust in the high-pressure gas storage chamber 1. Among them, the total length of the pressure beam 31 is determined according to factors such as the diameter of the maintenance chamber 2, the maximum internal pressure of the high-pressure gas storage chamber 1, and the cohesion between the chamber plug 3 and the inner wall of the maintenance chamber 2; the specific number of prestressed anchor bolts 32 to be set is obtained by calculating the required friction force according to the gas thrust of the underground high-pressure gas storage chamber 1 in actual situations, and the length of the prestressed anchor bolts 32 is calculated and determined according to the inner wall and stress conditions of the maintenance chamber 2. By covering the outer ends of the prestressed anchor bolts 32, covering the inner peripheral wall of the maintenance chamber 2, and wrapping the pressure beam 31 with the concrete layer 33, the pressure and friction force of the chamber plug 3 on the maintenance chamber 2 are further increased. On the basis of the chamber plug 3 providing friction force to the maintenance chamber 2, the cohesion between the chamber plug 3 and the inner wall interface of the maintenance chamber 2 is also increased, forming a composite and complete chamber plug 3, making the chamber plug 3 have better integrity, uniform force transmission, and improved safety. Moreover, the enclosed filling shape of the concrete layer 33 is regular, and a maintenance passage 331 is reserved for maintenance personnel to move between the maintenance chamber 2 and the high-pressure gas storage chamber 1. The chamber plug 3 with the radial prestressed composite structure type in this application is simple to construct, can significantly improve the safety of the plug, reduce the length of the plug, lower the project cost, shorten the project cycle, and is simple to construct.

[0031] Further, the pressure beam 31 includes three beam bodies 311, and the three beam bodies 311 are respectively arranged at intervals on both sides and the bottom of the maintenance chamber 2. In this embodiment, three beam bodies 311 can be arranged on both sides and the bottom of the hollow cylindrical maintenance chamber 2, which is the minimum number of beam bodies 311 to ensure the effective function of the prestressed composite structure type chamber plug 3. Such an arrangement can optimize the construction steps and effectively reduce the construction difficulty.

[0032] In order to ensure the uniform force of the chamber plug 3, in some embodiments, multiple prestressed anchor bolts 32 on the beam body 311 are fixed at uniform intervals along the axial direction. The prestressed anchor bolts 32 at uniform intervals penetrate the beam body 311 along the radial direction and are inserted into the inner wall of the maintenance chamber 2, effectively enhancing the safety of the structure of the chamber plug 3.

[0033] Further, the spacing between two adjacent prestressed anchor rods 32 on the beam body 311 is 1.2 - 2.0 m. When the spacing between two adjacent prestressed anchor rods 32 is within this range, it can not only avoid transporting too many prestressed anchor rods 32 and increasing the construction cost, but also ensure that the prestressed anchor rods 32 effectively apply prestress to the structure of the chamber plug 3. In actual situations, the specific spacing of the prestressed anchor rods 32 should be determined through calculation. Multiple prestressed anchor rods 32 fix the beam body 311 to the inner wall of the maintenance chamber 2, ensuring that the beam body 311 tightly presses against the wall of the maintenance chamber 2.

[0034] To further improve the safety of the structure of the chamber plug 3, in some embodiments, the beam body 311 includes a beam main body 3111 and protrusions 3112. The beam main body 3111 extends axially, and a plurality of the protrusions 3112 are arranged at intervals on both sides of the beam main body 3111. The prestressed anchor rods 32 are connected to the beam main body 3111. The multiple protrusions 3112 increase the contact area between the beam body 311 and the concrete layer 33, enhancing the integrity of the prestressed composite-structured chamber plug 3 and making the force transmission of the chamber plug 3 structure of the present invention more uniform.

[0035] Further, the prestressed anchor rod 32 includes a rod body 321 and a backing plate 322. The backing plate 322 is located at one end of the rod body 321. The rod body 321 penetrates through both sides of the maintenance chamber 2 and the beam body 311, and the backing plate 322 is fitted on the inner wall surface of the beam body 311. In this embodiment, when using the prestressed anchor rod 32, the rod body 321 is passed through the beam body 311 and deep into the inner wall of the maintenance chamber 2. The backing plate 322 is fitted on the inner wall surface of the beam body 311. After the prestressed anchor rod 32 applies prestress, a nut is fixed on the outside of the backing plate 322 to tighten the anchor head of the prestressed anchor rod 32, which is beneficial to ensuring that the beam body 311 is tightly pressed against the inner wall of the maintenance chamber 2 through the prestressed anchor rod 32.

[0036] Further, a maintenance opening 21 communicating with the maintenance passage 331 is provided on the side wall of the gas storage chamber 1. The chamber plug 3 structure further includes a sealing door 4, and the sealing door 4 is movably covered at the maintenance opening 21. In this embodiment, in addition to balancing the thrust along the longitudinal direction of the maintenance plug generated by the high-pressure gas inside the gas storage plug, the chamber plug 3 also takes into account the requirements of later maintenance work. Maintenance personnel can move between the maintenance chamber 2 and the gas storage chamber 1 through the maintenance opening 21 to complete the maintenance work. Under normal conditions, the sealing door 4 covers the maintenance opening 21 to ensure that the overall chamber plug 3 resists the internal pressure thrust from the gas storage chamber 1; when there is a maintenance requirement for the chamber plug 3 structure, the sealing door 4 is opened to allow maintenance personnel to move between the maintenance chamber 2 and the high-pressure gas storage chamber 1 to complete the maintenance work.

[0037] The present invention also provides a construction method for the structure of the chamber plug 3, including:

[0038] S1. Start digging a construction access tunnel from the ground. The construction access tunnel is connected to one side of the gas storage chamber 1, and the part of the tunnel body connecting the construction access tunnel and the gas storage chamber 1 is excavated into a hollow cylindrical shape. Three beam bodies 311 are cast in place along the axial direction on both sides and the bottom of the middle of the tunnel wall with concrete.

[0039] S2. After the beam bodies 311 reach the required hardness, drill holes from the inner wall surface of the beam main body 3111 towards the inner wall of the construction access tunnel. A certain distance is spaced between the holes drilled on each beam main body 3111. Calculate the required frictional force based on the gas thrust of the gas storage chamber 1 to obtain the number of prestressed anchor bolts 32 needed, and then determine the specific number of drill holes. Each prestressed anchor bolt 32 corresponds to a hole and penetrates both sides of the beam main body 3111 along the radial direction and inserts into the inner wall of the construction access tunnel. Fit the backing plate 322 to the inner wall surface of the beam body 311. After applying prestress to the prestressed anchor bolt 32, fix the nut on the inner side of the backing plate 322 to tighten the prestressed anchor bolt 32.

[0040] S3. Pour the concrete layer 33. The concrete layer 33 wraps the beam bodies 311, the prestressed anchor bolts 32, and the inner wall of the construction access tunnel, and a maintenance passage 331 is reserved. One side of the concrete layer 33 extends to connect with the gas storage chamber 1, and a maintenance opening 21 is reserved at the connection between the gas storage chamber 1 and the concrete layer 33.

[0041] S4. Install a sealing door 4 on the concrete layer 33 on one side of the maintenance opening 21.

[0042] In this embodiment, the prestressed anchor bolts 32 penetrate both sides of the pressure beam 31 along the radial direction and are inserted into the inner wall of the maintenance chamber 2. The beam body 311 of the pressure beam 31 extends along the axial direction, and multiple prestressed anchor bolts 32 are also axially spaced. Then, they are connected into a whole through the concrete layer 33. The chamber plug 3 designed in this way is a radial prestressed composite structure chamber plug 3, which can resist the gas storage chamber 1 storing high-pressure gas. The principle is: the maximum resistance of the chamber plug 3 = interfacial frictional force (μ·N) + interfacial cohesive force (c·A), where μ is the friction coefficient between the concrete of the chamber plug 3 and the surrounding rock of the maintenance chamber 2, N is the total pressure provided by all the prestressed anchor bolts 32 to press the pressure beam 31 against the inner wall of the maintenance chamber 2, c is the cohesive force between the concrete of the chamber plug 3 and the surrounding rock of the maintenance chamber 2, and A is the bonding area between the concrete of the chamber plug 3 and the surrounding rock of the maintenance chamber 2. The traditional chamber plug structure only utilizes the cohesive force, while the radial prestressed composite structure chamber plug 3 of the present invention not only utilizes the interfacial cohesive force but also gives full play to the interfacial frictional force, that is, uses the prestressed anchor bolts 32 and the pressure beam 31 to provide the pressure N to significantly increase the total resistance between the chamber plug 3 and the inner wall of the maintenance chamber 2, thereby shortening the length of the chamber plug 3 and reducing the project quantity.

[0043] Based on the disclosure and teachings of the above specification, those skilled in the art to which the present invention pertains can also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims

1. A chamber plugging structure, characterized in that: It includes a gas storage chamber, an inspection chamber arranged on one side of the gas storage chamber, and a chamber plug. The inspection chamber is in a hollow cylindrical shape, and one end is connected to the gas storage chamber. The chamber plug includes a pressure beam, a plurality of prestressed anchor rods and a concrete layer. The pressure beam comprises a plurality of beam bodies, the beam bodies extend in the axial direction, the plurality of beam bodies are arranged at intervals in the circumferential direction along the inner circumferential wall of the inspection chamber, the prestressed anchor rods penetrate the beam bodies and the inner wall surface of the inspection chamber in the radial direction, each of the beam bodies is correspondingly provided with the prestressed anchor rods distributed in sequence in the axial direction, and the beam body is fixedly connected to the inspection chamber through the prestressed anchor rods; The concrete layer is arranged along the inner peripheral wall of the maintenance chamber and covers the pressure beam and the prestressed anchor rod. One side of the concrete layer extends to connect with the gas storage chamber, and the concrete layer encloses and defines a maintenance passage.

2. The chamber plugging structure according to claim 1, characterized in that: The pressure beam comprises three beam bodies, and the three beam bodies are respectively arranged at intervals on both sides and the bottom of the inspection chamber.

3. The chamber plugging structure according to claim 2, characterized in that: The plurality of prestressed anchor rods on the beam body are evenly spaced and fixed along the axial direction.

4. The chamber plugging structure according to claim 3, characterized in that: The distance between two adjacent prestressed anchor rods on the beam body is 1.2-2.0 m.

5. The chamber plugging structure according to claim 2, characterized in that: The beam body comprises a beam main body and a protrusion, the beam main body extends in the axial direction, a plurality of the protrusions are arranged at intervals on both sides of the beam main body, and the prestressed anchor rod is connected to the beam main body.

6. The chamber plugging structure according to claim 1, characterized in that: The prestressed anchor rod comprises a rod body and a pad, wherein the pad is located at one end of the rod body, the rod body passes through the inspection chamber and both sides of the beam body, and the pad is fitted on the inner wall surface of the beam body.

7. The chamber plugging structure according to claim 1, characterized in that: An inspection port connected to the inspection passage is provided on the side wall of the gas storage chamber, and the chamber plug structure also includes a sealing door, which is movably covered at the inspection port.

8. A construction method for a chamber plugging structure, characterized in that: include: S1. Dig a branch hole from the ground, connect the branch hole to one side of the gas storage chamber, and dig the hole body part where the branch hole connects with the gas storage chamber into a hollow cylindrical shape, and cast three beams in axial direction on both sides and bottom of the middle of the hole wall with concrete; S2. After the beam body reaches the hardness, holes are drilled from the inner wall of the beam body to the inner wall of the construction branch hole. Each beam body is drilled with holes at a certain interval. The required friction force is calculated according to the gas thrust of the gas storage chamber to obtain the number of prestressed anchor rods to be set, and then the specific number of holes is determined. Each prestressed anchor rod corresponds to a hole that penetrates the beam body radially and is inserted into the inner wall of the construction branch hole. The pad is attached to the inner wall of the beam body. After the prestressed anchor rod is prestressed, the nut is fixed to the inner side of the pad to tighten the prestressed anchor rod; S3, pouring a concrete layer, which wraps the beam body, prestressed anchor rods and the inner wall of the construction branch hole, and reserves an inspection passage. One side of the concrete layer extends to connect with the gas storage chamber, and a maintenance port is reserved at the connection between the gas storage chamber and the concrete layer; S4. Install a sealed door on the concrete layer on one side of the inspection opening.

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