Underground gas storage and underground gas storage construction method

Abstract

The invention relates to the technical field of underground gas storages, and discloses an underground gas storage and an underground gas storage.The underground gas storage comprises surrounding rock, a supporting layer, linings and flexible filling parts, the surrounding rock is arranged underground, an opening is formed in the top of the surrounding rock, a containing cavity is formed in the surrounding rock, the supporting layer is arranged on the inner wall of the containing cavity, and the linings are arranged on the inner side of the supporting layer; a seam is formed between every two adjacent linings, a gas storage cavity is defined by the linings, the flexible filling pieces are arranged in the seams, and the sides, away from the surrounding rock, of the flexible filling pieces protrude out of the seams, the seams between the adjacent linings are filled with the flexible filling pieces, when the pressure in the gas outlet cavities is high, the linings are extruded by gas pressure to displace, the seams between the linings are enlarged, and the gas storage cavity is formed. The flexible filling piece deforms under the action of air pressure, and the end, protruding out of the parting joint, of the flexible filling piece is extruded and deformed towards the interior of the parting joint, so that the sealing performance of the parting joint can be guaranteed, the sealing performance of the underground gas storage is guaranteed, and meanwhile the lining can be prevented from cracking under the action of pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of underground gas storage, and in particular to an underground gas storage and an underground gas storage construction method. Background Art

[0002] Underground gas storage technology for compressed air energy storage power plants is widely used in the energy storage field. Currently, commonly used gas storage facilities include natural salt caverns and artificial underground chambers. However, natural salt caverns are limited by geological conditions and are not easily deployed in specific areas. Artificial underground gas storage, on the other hand, reduces reliance on geological conditions and offers greater site flexibility.

[0003] Existing sealing systems for artificial underground gas storage systems often use rigid sealing materials, which have poor deformation resistance, are difficult to construct, and are costly. Furthermore, rigid sealing structures are prone to cracking in the lining under high internal pressure, compromising the sealing effect. Summary of the Invention

[0004] In view of this, the present invention provides an underground gas storage and an underground gas storage construction method to solve the problems in the prior art that underground gas storage uses rigid sealing materials, which are difficult to construct, costly, and prone to cracking, affecting the sealing effect.

[0005] In a first aspect, the present invention provides an underground gas storage reservoir, comprising surrounding rock, a supporting layer, a lining and a flexible filling member, wherein the surrounding rock is arranged underground, an opening is provided at the top of the surrounding rock, and the interior is a receiving cavity, the supporting layer is arranged on the inner wall of the receiving cavity, a plurality of linings are arranged on the inner side of the supporting layer, a joint is provided between adjacent linings, and the linings enclose a gas storage cavity, the flexible filling member is arranged in the joint, and the flexible filling member protrudes from the joint on the side away from the surrounding rock.

[0006] Beneficial effects: The present invention fills the joints between adjacent linings with flexible filling pieces. When the pressure in the air outlet cavity is high, the air pressure squeezes the lining to cause displacement, causing the joints between the linings to become larger. The flexible filling piece is deformed under the action of the air pressure, and the end of the flexible filling piece protruding from the joint is squeezed and deformed into the joint, which can ensure the sealing of the joint, thereby ensuring the sealing of the underground gas storage, and at the same time avoiding the lining from cracking under the action of pressure.

[0007] In an optional embodiment, the underground gas storage further includes a sealing member, which is disposed on the flexible filling member and abuts against an adjacent lining.

[0008] Beneficial effects: The present invention covers the sealing member on the flexible filling member, which can ensure the sealing of the joints, thereby ensuring the sealing of the underground gas storage.

[0009] In an optional embodiment, the flexible filling member includes a filling portion and a protruding portion, the filling portion is located in the joint, the protruding portion is located at one end of the filling portion away from the surrounding rock, and the protruding portion protrudes from the plane of the lining away from the surrounding rock.

[0010] Beneficial effect: The protrusion of the present invention can be deformed under air pressure operation to adapt to the change of pressure and ensure its sealing performance at the seam.

[0011] In an optional embodiment, the underground gas storage further includes tie rods connecting adjacent linings.

[0012] Beneficial effects: The present invention installs tie rods at adjacent lining joints to connect adjacent lining blocks, ensuring stability when pressure changes.

[0013] In an optional embodiment, the supporting layer includes anchor rods and a spray layer, a plurality of anchor rods are arranged on the inner wall of the surrounding rock, and the spray layer is arranged on the inner wall of the surrounding rock.

[0014] Beneficial effects: The present invention arranges anchor rods and sprayed layers on the inner wall of the surrounding rock, which can be used as the initial support of the cavern surrounding rock. The anchor rods, concrete sprayed layers and surrounding rock form a system that works together to prevent the rock mass from loosening and separating.

[0015] In an optional embodiment, the lining is made of reinforced concrete.

[0016] In a second aspect, the present invention further provides an underground gas storage construction method, which is applied to the above-mentioned underground gas storage, and the construction method comprises:

[0017] Carry out surrounding rock excavation according to the design plan;

[0018] Setting a supporting layer on the inner wall of the surrounding rock;

[0019] Install lining on the support layer and set joints between adjacent linings;

[0020] A flexible filling piece is arranged in the joint so that the flexible filling piece protrudes out of the joint away from the surrounding rock;

[0021] A sealing member is provided on the flexible filling member.

[0022] In an optional embodiment, providing a support layer on the inner wall of the surrounding rock includes:

[0023] Install anchor rods on the inner wall of the surrounding rock;

[0024] Spray concrete on the inner wall of the surrounding rock.

[0025] In an optional embodiment, before installing the anchor rod on the inner wall of the surrounding rock, the method further includes:

[0026] Grouting is carried out on the inner wall of the surrounding rock.

[0027] In an optional embodiment, installing a lining on the supporting layer and providing joints between adjacent linings includes:

[0028] Build the steel cage according to the design plan;

[0029] During the construction process, reserve the locations where the joints need to be split in advance, and reserve space for installing the tie rods at the joints;

[0030] Install the tie rod at the reserved joint position;

[0031] Set up lining formwork according to the size and shape of the lining;

[0032] Pour concrete according to design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 A top view of an underground gas storage reservoir according to an embodiment of the present invention;

[0035] Figure 2 This is an enlarged schematic diagram of adjacent linings in an underground gas storage facility according to an embodiment of the present invention;

[0036] Figure 3 A schematic flow chart of a method for constructing an underground gas storage facility according to an embodiment of the present invention.

[0037] Description of reference numerals:

[0038] 1. Surrounding rock; 2. Support layer; 201. Anchor rod; 202. Shotcrete layer; 3. Lining; 4. Flexible filling member; 401. Filling part; 402. Protrusion; 5. Sealing member; 6. Pull rod. DETAILED DESCRIPTION

[0039] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0040] The following combination Figures 1 to 3 , describing embodiments of the present invention.

[0041] According to an embodiment of the present invention, on the one hand, Figure 1 and Figure 2 As shown, an underground gas storage is provided, including surrounding rock 1, a supporting layer 2, a lining 3 and a flexible filling member 4. The surrounding rock 1 is set underground, an opening is provided at the top of the surrounding rock 1, and the interior is a receiving cavity. The supporting layer 2 is set on the inner wall of the receiving cavity, and a plurality of linings 3 are set on the inner side of the supporting layer 2. A joint is provided between adjacent linings 3, and the linings 3 enclose a gas storage cavity. The flexible filling member 4 is set in the joint, and the side of the flexible filling member 4 away from the surrounding rock 1 protrudes out of the joint.

[0042] Specifically, the operating pressure of the underground gas storage in this embodiment is 10 MPa to 20 MPa, and the surrounding rock 1 is mainly relied on to withstand the huge gas pressure. During operation, the pressure and temperature are constantly and frequently cycled with the inflation, storage and deflation processes.

[0043] In this embodiment, the surrounding rock 1 is formed by excavating the underground rock mass. The top of the surrounding rock 1 is provided with an opening, and the interior is a receiving cavity. The surrounding rock 1 should preferably be a hard rock layer with a certain spatial scale, with priority given to igneous rock formations, followed by sedimentary rock and metamorphic rock formations. The rock mass integrity is relatively complete, and the category of the surrounding rock 1 is generally not lower than Class III. The surrounding rock 1 should avoid active fault (crack) structures and their fracture zones, and try to avoid regional lithologic boundaries and structural geomorphic boundaries. At the same time, it should avoid areas with high seismic intensity of degree VIII and above and areas with strong seismic activity. In order to ensure the sealing of the surrounding rock 1, the initial stress field of the surrounding rock 1 should not have tensile stress, and the lateral pressure coefficient should be between 1 / 3 and 3, preferably between 2 / 3 and 2. The surrounding rock 1 should be selected in sections and areas with relatively simple hydrogeological conditions, avoiding sections with developed bedrock fissure water, large karst karst and underground dark rivers.

[0044] The present invention fills the joints between adjacent linings 3 with flexible filling members 4. When the pressure in the air outlet cavity is high, the air pressure squeezes the lining 3 to cause displacement, causing the joints between the linings 3 to become larger. The flexible filling members 4 are deformed under the action of the air pressure, and the end of the flexible filling member 4 protruding from the joint is squeezed and deformed into the joint, which can ensure the sealing of the joint, thereby ensuring the sealing of the underground gas storage, and at the same time preventing the lining 3 from cracking under the action of pressure.

[0045] In this embodiment, a support layer 2 is provided on the inner wall of the surrounding rock 1. The support layer 2 and the surrounding rock 1 form a system that works together to prevent the rock mass from loosening and separating. The surrounding rock 1 of a certain thickness is transformed into a self-supporting arch, effectively stabilizing the surrounding rock 1.

[0046] In this embodiment, Figure 1 and Figure 2As shown, there is no specific limitation on the lining 3. For example, in this embodiment, the cross-section of the lining 3 is arc-shaped, the outer walls of several linings 3 are in contact with the supporting layer 2, and the linings 3 are adjacently arranged to enclose an air storage cavity with a circular interior. A seam is left between two adjacent linings 3, and a flexible filling member 4 is provided in each seam.

[0047] In this embodiment, the flexible filling member 4 is not specifically limited. For example, in this embodiment, the flexible filling member 4 is made of flexible concrete. Flexible concrete has good flexibility and can adapt to various pressure changes. Flexible concrete also has excellent strength and bearing capacity and can withstand greater pressure and load.

[0048] In one embodiment, Figure 1 and Figure 2 As shown, the underground gas storage further includes a seal 5 , which is disposed on the flexible filling member 4 and abuts against the adjacent lining 3 .

[0049] Specifically, the underground gas storage relies on a seal 5 installed on the inner surface of the lining 3 to ensure its sealing performance. The basic design concept is that the seal 5 only seals the gas within the reservoir and does not itself bear the internal pressure of the gas storage. Instead, it transfers the internal gas pressure to the lining 3 and surrounding rock 1, where it is borne by the surrounding rock 1. In this embodiment, the seal 5 is not specifically limited. For example, in this embodiment, the seal 5 is a rubber sheet. The length of the seal 5 is the same as the length of the joint, and the width is greater than the width of the joint. The seal 5 covers the joint, enclosing the flexible filler 4, and its two sides are respectively in contact with the surfaces of the two adjacent linings 3 facing away from the surrounding rock 1.

[0050] The thickness design of the seal 5 should also take into account its circumferential deformation and radial deformation to ensure that no circumferential tensile damage occurs. The radial deformation control should be combined with the crack width of the lining 3 to ensure that the seal 5 is not squeezed into the joint and damaged.

[0051] In the present invention, the sealing member 5 is covered on the flexible filling member 4, which can ensure the sealing of the joint, thereby ensuring the sealing of the underground gas storage.

[0052] In one embodiment, Figure 2 As shown, the flexible filling member 4 includes a filling portion 401 and a protruding portion 402 . The filling portion 401 is located in the joint, and the protruding portion 402 is located at the end of the filling portion 401 away from the surrounding rock 1 . The protruding portion 402 protrudes from the plane of the side of the lining 3 away from the surrounding rock 1 .

[0053] Specifically, in this embodiment, the filling portion 401 is densely filled in the joint, the protrusion 402 is located at the end of the filling portion 401 away from the surrounding rock 1, the protrusion 402 and the filling portion 401 are an integrated structure, the protrusion 402 protrudes from one side of the inner wall of the surrounding rock 1, and when the sealing member 5 covers the joint, the protrusion 402 is wrapped inside it.

[0054] In the present invention, the protrusion 402 can be deformed under the action of air pressure to adapt to the change in pressure and ensure its sealing performance at the seam.

[0055] In one embodiment, Figure 1 and Figure 2 As shown, the underground gas storage further includes tie rods 6 , which connect adjacent linings 3 .

[0056] Specifically, in this embodiment, there is no specific limitation on the tie rod 6. For example, in this embodiment, the tie rod 6 is made of φ16 steel bars. Two tie rods 6 are arranged between two adjacent linings 3 along the extension direction of the joint. The middle of the tie rod 6 is horizontal, and the two ends are arc-shaped. The arc-shaped ends of the two tie rods 6 are arranged facing each other.

[0057] The present invention installs tie rods 6 at the joints of adjacent linings 3, which can connect the adjacent linings 3, ensure stability when the pressure changes, and reduce the concentration of hoop tensile stress.

[0058] In one embodiment, Figure 1 As shown, the supporting layer 2 includes anchor rods 201 and a spray layer 202 . Several anchor rods 201 are arranged on the inner wall of the surrounding rock 1 , and the spray layer 202 is arranged on the inner wall of the surrounding rock 1 .

[0059] Specifically, in this embodiment, several anchor rods 201 are fixed to the inner wall of the excavated surrounding rock 1. Anchor rods 201 can be embedded within the rock mass of surrounding rock 1, adjusting the stress distribution in the rock mass and thereby improving the overall strength of surrounding rock 1. Prestressed anchor rods 201, in particular, can increase the compressive area of ​​surrounding rock 1 and reduce the tensile area, significantly improving the stress of surrounding rock 1. Using a group of anchor rods 201 for reinforcement can form a compression zone within a certain range, achieving a particularly significant reinforcement effect.

[0060] In this embodiment, the sprayed layer 202 is formed using shotcrete. The bond strength between the shotcrete and the surrounding rock 1 can generally be maintained above 1.0 MPa. Not only do the two adhere tightly, but the bonding force and shear resistance on the bonding surface can also connect the rock mass on the tunnel surface cut by joints and fissures, maintaining interlocking and interlocking between the rock blocks. Furthermore, shotcrete can transfer load from the rock mass that is about to become unstable to the surrounding stable rock mass, preventing rock slippage. The sprayed concrete upper sprayed layer 202 has a thickness of between 5 cm and 10 cm and can immediately act on the rock mass after solidification. The anchor rods 201 themselves also have a strong bearing capacity and can withstand large deformation or move together with the reinforced surrounding rock 1. The support layer 2 is even more important in controlling the plastic rheology of the rock mass. It allows the surrounding rock 1 to develop a certain plastic zone, avoiding stress peaks without causing harmful loosening, and fully utilizing the bearing capacity of the surrounding rock 1 itself.

[0061] In this embodiment, the support layer 2 can be reinforced locally or as a whole within the surrounding rock 1. The reinforcement can be achieved by using anchor rods 201 or sprayed layers 202 alone, or by using a combination of sprayed anchors and sprayed anchors, or by using them together with steel arches. Furthermore, different reinforcement methods can be selected based on the different reinforcement requirements for different locations. The construction of the support layer 2 can be performed in one go or in multiple installments. This can satisfy the need for the plastic rheological surrounding rock 1 to have a flexible support structure, thereby adjusting the balance between support flexibility and resistance.

[0062] In this embodiment, the sprayed concrete has a high cement content and a low water-cement ratio, resulting in high impermeability. The near-absence of construction joints allows for better adhesion between sprayed layers, resulting in superior sealing performance. Furthermore, sprayed concrete is more impermeable, protecting the rock mass from erosion by moist air or groundwater, and the resulting deliquescence and deterioration, thereby maintaining the original strength of the surrounding rock mass. Shotcrete also prevents the loss of filler between faults or joints, maintaining inter-joint friction. Furthermore, the sprayed layer prevents the intrusion of corrosive chemical gases and improves the rock mass's frost resistance.

[0063] The present invention sets anchor rods 201 and sprayed layer 202 on the inner wall of surrounding rock 1, which can serve as the initial support of cave surrounding rock 1. Anchor rods 201, concrete sprayed layer 202 and surrounding rock 1 form a system that works together to prevent the rock mass from loosening and separating.

[0064] In one embodiment, the lining 3 is made of reinforced concrete.

[0065] Specifically, in this embodiment, the lining 3 is made of reinforced concrete. The thickness of the lining 3 is generally not less than 50 cm and not more than 100 cm, and the concrete strength grade is not higher than C45.

[0066] According to an embodiment of the present invention, on the other hand, Figure 3 As shown, a construction method of an underground gas storage is also provided, which is applied to the above-mentioned underground gas storage, and the construction method includes:

[0067] Carry out excavation of surrounding rock 1 according to the design plan;

[0068] A support layer 2 is provided on the inner wall of the surrounding rock 1;

[0069] Installing lining 3 on the supporting layer 2 and setting joints between adjacent linings 3;

[0070] A flexible filling member 4 is provided in the split;

[0071] A sealing member 5 is provided on the flexible filling member 4 .

[0072] In one embodiment, providing a support layer 2 on the inner wall of the surrounding rock 1 includes:

[0073] Installing anchor rod 201 on the inner wall of surrounding rock 1;

[0074] Spray concrete on the inner wall of the surrounding rock 1.

[0075] In one embodiment, before installing the anchor rod 201 on the inner wall of the surrounding rock 1, the method further includes:

[0076] Grouting is performed on the inner wall of surrounding rock 1.

[0077] Specifically, the underground gas storage construction method in this embodiment includes:

[0078] S1: The cross-sectional dimensions of underground gas storage reservoirs should be designed taking into account factors such as the surrounding rock type, surrounding rock stress distribution, maximum design pressure of the gas storage reservoir, temperature distribution of the gas storage reservoir, surface area of ​​the sealing layer, construction technology, and difficulty. Excavation of surrounding rock should be carried out on the rock mass according to the design plan, with an excavation depth of 15 meters, ensuring that the excavation dimensions meet the gas storage reservoir design requirements.

[0079] S2: Underground gas storage must withstand high internal pressure during operation, so support is required during construction. The installation of support layer 2 not only improves the stability of the surrounding rock but also provides a flat base for the sealing layer structure, ensuring that gas pressure is evenly transferred to the surrounding rock 1. This facilitates the coordinated deformation of the sealing structure, lining 3 structure, and surrounding rock 1. After excavation of surrounding rock 1 is completed, support layer 2 is installed on the inner wall of surrounding rock 1.

[0080] S3: After the construction of the support layer 2 is completed, the lining 3 is installed on the support layer 2. Several linings 3 are enclosed to form the gas storage cavity of the designed gas storage, and a certain distance is reserved between two adjacent linings 3 to form a gap;

[0081] S4: The function of the flexible seal is, on the one hand, to reduce or prevent the leakage of high-pressure gas through the cracks in the lining 3 and the surrounding rock 1, and on the other hand, to serve as a buffer layer between the high-pressure gas and the lining 3 and the surrounding rock 1. Taking into account the unevenness and differences in deformation of different parts of the gas storage reservoir after being pressurized, the closed structure and the sealing layer should have a certain degree of flexibility and the ability to resist uneven deformation. During design, the circumferential strain of the lining 3 structure is usually used as an important criterion for airtightness, with the principle of no circumferential tensile damage, that is, the circumferential tensile strain does not exceed the ultimate tensile strain. Fill the joint with flexible concrete with a filling height of 1 cm and a protrusion of 5 cm to the clearance surface to form a flexible filling member 4;

[0082] S5: Paste a rubber material with a thickness of 3mm on the flexible concrete, covering the entire flexible concrete area to ensure airtightness.

[0083] In one embodiment, step S2: installing the lining 3 on the supporting layer 2 and setting joints between adjacent linings 3 includes:

[0084] S21: Build a steel cage according to the design plan. The steel bar specification is HRB400, the diameter is 16mm, and the spacing is 20cm.

[0085] S22: During the construction process, the positions where the joints need to be split are reserved in advance, and space is reserved at the joints for installing the tie rods 6;

[0086] S23: Install a 20mm diameter tie rod 6 at the reserved joint position to ensure a secure connection between the three adjacent linings;

[0087] S24: Set up the lining 3 formwork according to the size and shape of the lining 3, and reserve a place for flexible concrete filling;

[0088] S25: Concrete pouring is carried out according to the design requirements. The concrete strength grade is C40 and the curing time is 28 days.

[0089] During the construction of the underground gas storage, the present invention fills the joints between adjacent linings 3 with flexible filling members 4. When the pressure in the air outlet cavity is high, the air pressure squeezes the linings 3 to cause displacement, causing the joints between the linings 3 to become larger. The flexible filling members 4 deform under the action of the air pressure, thereby ensuring the sealing of the joints and thus ensuring the sealing of the underground gas storage.

[0090] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An underground gas storage, characterized in that: include: Surrounding rock (1), the surrounding rock (1) is arranged underground, the top of the surrounding rock (1) is provided with an opening, and the interior is a receiving cavity; A supporting layer (2), the supporting layer (2) being arranged on the inner wall of the accommodating cavity; Lining (3), wherein a plurality of linings (3) are arranged on the inner side of the supporting layer (2), a gap is provided between adjacent linings (3), and the linings (3) enclose an air storage cavity; A flexible filling piece (4) is arranged in the split, and the flexible filling piece (4) protrudes out of the split on a side away from the surrounding rock (1).

2. The underground gas storage according to claim 1, characterized in that: Also includes: A sealing member (5), wherein the sealing member (5) is arranged on the flexible filling member (4), and the sealing member (5) abuts against the adjacent lining (3).

3. The underground gas storage according to claim 1 or 2, characterized in that: The flexible filling member (4) comprises: A filling portion (401), the filling portion (401) being located in the split; A protruding portion (402) is located at one end of the filling portion (401) away from the surrounding rock (1), and the protruding portion (402) protrudes from a plane of one side of the lining (3) away from the surrounding rock (1).

4. The underground gas storage according to claim 1, characterized in that: Also includes: A tie rod (6) is provided, wherein the tie rod (6) connects adjacent linings (3).

5. The underground gas storage according to claim 1, characterized in that: The supporting layer (2) comprises: Anchor rods (201), wherein a plurality of the anchor rods (201) are arranged on the inner wall of the surrounding rock (1); A spray layer (202), the spray layer (202) is arranged on the inner wall of the surrounding rock (1).

6. The underground gas storage according to claim 1, characterized in that: The lining (3) is made of reinforced concrete.

7. A method for constructing an underground gas storage, characterized in that: Applicable to the underground gas storage according to any one of claims 1 to 6, the construction method comprises: Excavate the surrounding rock (1) according to the design plan; Providing a support layer (2) on the inner wall of the surrounding rock (1); Installing lining (3) on the supporting layer (2) and providing joints between adjacent linings (3); A flexible filling piece (4) is provided in the joint, so that the flexible filling piece (4) protrudes out of the joint on a side away from the surrounding rock (1); A sealing member (5) is provided on the flexible filling member (4).

8. The underground gas storage construction method according to claim 7, characterized in that: The step of providing the support layer (2) on the inner wall of the surrounding rock (1) comprises: Installing an anchor rod (201) on the inner wall of the surrounding rock (1); Spray concrete on the inner wall of the surrounding rock (1).

9. The underground gas storage construction method according to claim 8, characterized in that: Before installing the anchor rod (201) on the inner wall of the surrounding rock (1), the method further includes: Grouting is performed on the inner wall of the surrounding rock (1).

10. The underground gas storage construction method according to claim 7, characterized in that: The step of installing the lining (3) on the supporting layer (2) and providing joints between adjacent linings (3) comprises: Build the steel cage according to the design plan; During the construction process, the locations where the splitting is required are reserved in advance, and space for installing the pull rod (6) is reserved at the splitting; Install the pull rod (6) at the reserved split position; According to the size and shape of the lining (3), set up the lining (3) template; Pour concrete according to design requirements.

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