A construction process of a steel lining of a rock cavern gas storage

Abstract

The application discloses a kind of cave gas storage steel lining construction process, it is related to tunnel construction technical field, steel lining construction process includes the following steps: the surrounding rock is excavated to form cave;The end and top of first section concrete lining are concreted;Laying slide rail, first section steel lining is placed on slide rail by bracket, and first section steel lining is pushed into cave;After first section steel lining is positioned, bracket is lifted using support seat, to make bracket disengage from slide rail, and slide rail is recycled;The bottom of first section concrete lining is concreted;The above steps are repeated, and the assembly of all subsequent steel linings is sequentially completed.Compared with the existing steel lining using cantilever assembly mode, the work efficiency of the steel lining construction process of the application is high and the construction precision is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel construction, in particular to a rock cave gas storage steel lining construction process. BACKGROUND

[0002] The current underground gas storage structure is mainly composed of surrounding rock, lining and steel lining. The lining and surrounding rock serve as the main force structure, and the steel lining serves as the sealing structure and plays the role of force transmission. In order to ensure the quality of the lining, the lining concrete needs to be poured first, and then the steel lining is installed. This construction process leaves very limited space for the assembly and welding of the steel lining after the lining construction. Since the steel lining itself can transmit a large internal pressure, the assembly precision in the cavern will affect the welding quality, and thus the stability of the overall structure.

[0003] The current mainstream construction method of steel lining is cantilever assembly. Due to the large radius, heavy weight and narrow construction space of the steel lining, the construction precision requirement is high. The current cantilever construction method is difficult to meet the construction precision requirement and has low construction efficiency. Therefore, it is necessary to improve it to improve the construction precision and efficiency. SUMMARY

[0004] The purpose of the present application is to overcome the above technical deficiencies and provide a rock cave gas storage steel lining construction process to solve the technical problems of low construction precision and low work efficiency caused by the current technology of steel lining using cantilever assembly.

[0005] To achieve the above technical purpose, the following technical solutions are adopted:

[0006] The present application provides a rock cave gas storage steel lining construction process, which comprises the following steps:

[0007] Excavating the surrounding rock to form a rock cave;

[0008] Pouring concrete on the end and top of the first section of concrete lining;

[0009] Laying a slide rail, placing the first section of steel lining on the slide rail through a bracket, and pushing the first section of steel lining into the rock cave;

[0010] After positioning the first section of steel lining, using a support seat to lift the bracket to make the bracket disengage from the slide rail and recycle the slide rail;

[0011] Pouring concrete on the bottom of the first section of concrete lining;

[0012] Repeating the above steps of top concrete pouring, slide rail recycling and bottom concrete pouring to sequentially complete the assembly of all subsequent steel linings.

[0013] In some embodiments, all processes are calibrated using a calibrator that emits a laser to calibrate the elevation and coordinates so that the central axes of all steel liners are aligned on the same straight line.

[0014] In some embodiments, when the next steel liner slides into the cave along the slide rail, the two adjacent steel liners are aligned using edge-fitting clips to complete the initial positioning of the steel liners.

[0015] In some embodiments, after two adjacent steel liners are aligned, the edge mating clips are removed, and the two adjacent steel liners are welded to form a weld.

[0016] In some embodiments, the weld is heat-treated.

[0017] In some embodiments, a support frame is placed on the inner wall of the steel liner to support the steel liner, and the support frame is removed after all the steel liners have been welded.

[0018] In some embodiments, the top of the bracket is configured as an arc surface that conforms to the curvature of the steel liner, so that the top of the bracket fits fully against the outer wall of the steel liner.

[0019] In some embodiments, surrounding rock with geological conditions of level three or above is selected for excavation to form a cave.

[0020] In some embodiments, a rail wheel is provided at the bottom of the bracket, and the rail wheel is slidably engaged with a slide rail.

[0021] In some embodiments, the distance between the edge of the first concrete section and the edge of the steel lining is maintained at more than one meter.

[0022] Compared with existing technologies, the steel lining construction process for a rock cave gas storage facility provided by this invention involves pouring concrete at the ends and top of the first section of concrete lining before the steel lining enters the cave. This provides ample construction space, facilitating concrete pouring and resulting in higher construction precision. Each section of steel lining enters the cave by sliding along a guide rail. After positioning within the cave, concrete is poured at the bottom of the first section of concrete lining, which reduces construction difficulty and improves accuracy. This process is repeated to install multiple sections of steel lining, which are then welded together to complete the connection. Compared to the cantilever assembly method used in existing steel linings, the steel lining construction process of this invention offers higher work efficiency and construction precision. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the first steel liner being installed according to an embodiment of the present invention;

[0024] Figure 2 yes Figure 1 A side view diagram;

[0025] Figure 3 This is a schematic diagram of the connection between the bracket, slide rail, and support base provided in an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the intermediate steel liner and the first steel liner after welding, as provided in an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure when the end steel liner and the middle steel liner are welded together according to an embodiment of the present invention;

[0028] Figure 6 This is a schematic flowchart of the construction process of the steel lining of the rock cave gas storage facility provided in the embodiment of the present invention. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0030] To address the technical problems of low construction accuracy and low work efficiency caused by the cantilever assembly process used in the existing technology for steel lining, this invention provides a construction process for steel lining of a rock cave gas storage facility, which can achieve high construction efficiency and high construction accuracy.

[0031] Please see Figure 1 , Figure 1 This is a schematic diagram of the construction process of the steel lining for a cave gas storage facility according to one embodiment of the present invention. The construction process of the steel lining for the cave gas storage facility includes the following steps:

[0032] S1: Excavate the surrounding rock to form a cave;

[0033] The surrounding rock 20 is selected based on geological conditions of Grade III or above. This type of surrounding rock has strong compressive strength, low risk of collapse after excavation, and can be used for a long time. The geological conditions of the surrounding rock 20 can be detected using geological survey instruments, which is a conventional technique, and the specific details will not be described in detail.

[0034] S2: Concrete is poured at the ends and top of the first concrete lining 1;

[0035] The steel lining generally comprises two bullet-shaped end steel linings and a plurality of cylindrical intermediate steel linings, the hole entering sequence being that one of the end steel linings is first entered into the hole, then the plurality of intermediate steel linings are sequentially entered into the hole, and finally the other end steel lining is entered into the hole, and the splicing of adjacent steel linings and the concrete construction are sequentially completed. Since all the steel linings need to be covered by concrete lining, the top and end of the concrete lining 1 covering the first section of steel lining 3 can be poured before the first section of steel lining 3 is entered into the hole, at this time, there is no steel lining in the cave 2, the construction space is large, and the construction efficiency and precision are improved. In addition, the distance between the first section of concrete and the edge of the first section of steel lining 3 is kept above one meter, so that the first section of concrete is more, which can form a strong protective effect on the first section of steel lining 3.

[0036] S3: laying a slide rail, placing the first section of steel lining 3 (end steel lining) on the slide rail 5 through the bracket 4, and pushing the first section of steel lining 3 into the cave 2;

[0037] The slide rail 5 can be arranged along the extension direction of the cave 2, so that the plurality of sections of steel lining are arranged along the extension direction of the cave. The slide rail 5 can be laid as needed, the plurality of slide rails 5 are arranged in parallel, the bottom of the bracket 4 is placed on the plurality of slide rails 5, the first section of steel lining 3 is pushed into the cave 2 by pushing the bracket 4, and the end and top of the first section of steel lining 3 are attached to the top and top of the concrete lining 1, so as to position the end and top of the first section of steel lining 3. The bottom of the bracket 4 is provided with a rail wheel 12, and the rail wheel 12 is slidably connected to the slide rail 5, so that the bracket 4 is stably connected to the slide rail 5, and the bracket 4 can stably slide into the cave 2 along the slide rail 5.

[0038] S4: after the first section of steel lining 3 is positioned, the bracket 4 is lifted by using the support seat 6, so that the bracket 4 is separated from the slide rail 5, and the slide rail 5 is recycled;

[0039] The support seat 6 can be understood as a jack, which can lift the bracket 4 together with the first section of steel lining 3, so that the bracket 4 is separated from the slide rail 5, so as to facilitate the slide rail 5 to be pulled out of the cave 2 for use of the next section of steel lining 30. The support seat 6 can stay in place for subsequent construction.

[0040] S5: pouring concrete on the bottom of the first section of concrete lining 1 (shown); Figure 4

[0041] ​After the bottom of the first section of concrete lining 1 is completed, the concrete at the top and end of the first section of concrete lining 1 can completely cover the first section of steel lining 3 to provide support for the first section of steel lining 3 and separate the first section of steel lining 3 from the surrounding rock 20. At the beginning, the bottom of the concrete lining 1 is not poured to provide a larger operating space for the first section of steel lining 3, which facilitates the positioning of the first section of steel lining 3 and the top and end of the concrete lining 1, and is beneficial to improve work efficiency and construction accuracy.

[0042] S6: Repeat steps S2-S5 to sequentially complete the assembly of all subsequent steel linings;

[0043] It should be emphasized that when pouring the concrete lining of the next section of steel lining 30 (intermediate steel lining), only the top and bottom need to be poured to cover and fix the intermediate steel lining 30.

[0044] In one embodiment, please refer to Figure 1 All procedures use a calibrated instrument 11 to emit laser light for calibration, calibration of elevation and coordinates, so that the center axes of all steel linings are located on the same straight line to improve the accuracy of the splicing of multiple steel linings. The cave 2 is also cylindrical, and the center axis of the cave 2 is also located on the same straight line as the center axes of all steel linings, so that the concrete thickness of the top and bottom of the concrete lining 1 is consistent, maintaining the uniformity of the force on the steel lining.

[0045] In one embodiment, please refer to Figure 2 and Figure 4 When the intermediate steel lining 30 slides into the cave 2 along the slide rail 5, the adjacent first section of steel lining 3 and the intermediate steel lining 30 are aligned using the edge butt joint clamp 7 to complete the pre-positioning of the two steel linings. The edge butt joint clamp 7 is installed on the two end edges of the steel lining, and at least four edge butt joint clamps 7 are installed on each end edge. The corresponding connection of the multiple edge butt joint clamps 7 of the end portions of the two steel linings close to each other positions the adjacent two steel linings, and the edge butt joint clamps 7 are removed before welding to facilitate welding.

[0046] In one embodiment, please refer to Figure 4 After the adjacent two steel linings are aligned, the edge butt joint clamps 7 are removed, and the adjacent two steel linings are welded to form a weld 14. After welding is completed, the top and bottom of the second section of concrete lining 15 are poured to fix the second section of steel lining 30.

[0047] In one of the embodiments, the welds 14 between the adjacent steel liners are heat treated to improve the microstructure and properties of the welded joints. By heat treatment, the hardened zone can be softened, the hardness can be reduced, the impact toughness and the creep limit can be improved, thus preventing brittle failure of the welded structure. The stress generated during welding can also be eliminated or reduced. Post-weld heat treatment can eliminate the welding residual stress, prevent the generation of delayed cracks, and improve the reliability and life of the welded parts.

[0048] In one of the embodiments, referring to Figure 2 , the intermediate steel liner 30 is cylindrical, and the steel liner is rolled in the factory in advance and transported to the construction site. Before the steel liner is put into formal use, a support frame can be installed inside the steel liner. The support frame tightly abuts against the inner wall of the steel liner to maintain the roundness of the steel liner and control the deformation of the steel liner due to its own weight, so that the multiple steel liners can completely match when spliced, which is beneficial to improve the splicing efficiency and stability after splicing. The support frame is removed after all the steel liners are welded. In this embodiment, the support frame includes two horizontal rods 8 and two vertical rods 9 which are rotationally connected in sequence, and the horizontal rods 8 and the vertical rods 9 are rotationally connected by using butt joints 10. The lengths of the horizontal rods 8 and the vertical rods 9 can be set according to the inner diameter of the steel liner, so that the four butt joints 10 tightly abut against the inner wall of the steel liner. The horizontal rods 8 and the vertical rods 9 can also be set as telescopic structures to meet the support of steel liners with different inner diameters.

[0049] In one of the embodiments, referring to Figure 2 and Figure 3 , the steel liner 30 is cylindrical, and the outer wall is arc-shaped. The steel liner 30 is placed on the top of the bracket 4. The top of the bracket 4 is set as an arc surface consistent with the arc of the steel liner 30, so that the top of the bracket 4 fully matches the outer wall of the steel liner 30. During the process of sliding into the cave 2 on the slide rail 5, the bracket 4 can stably support the steel liner 30. In other embodiments, the shape of the outer wall of the steel liner 30 can also be set as other shapes, such as an ellipse. At this time, the top of the bracket 4 can also be set as an elliptical surface to maintain the matching with the steel liner. In addition, the number of the bracket 4 is not limited, and one or more brackets can be set. Multiple brackets can simultaneously support the steel liner 30 and can simultaneously slide on the slide rail 5 to jointly push the steel liner 30 into the cave 2.

[0050] In one of the embodiments, referring to Figure 5 , after the installation of the intermediate steel liner 30 is completed, the end steel liner 40 can be pushed into the cave 2 in the above-mentioned manner, and then welded with the other end of the intermediate steel liner 30 to complete the connection. The number of the steel liners in this embodiment is three. In other embodiments, the number of the intermediate steel liners 30 is not limited, for example, it can be two or more, which can be determined according to the construction depth.

[0051] For better understanding of the present application, the following combines Figures 1 to 5 The technical solutions of the present application are described in detail:

[0052] The rock cave gas storage steel lining construction process provided by the present application pours concrete at the end and top of the first section of concrete lining before the steel lining enters the rock cave, at this time, the construction space is large, and it is convenient for concrete pouring construction, and the construction precision is high. Each section of steel lining enters the rock cave by sliding on the slide rail, and after positioning, the bottom of the first section of concrete lining is poured with concrete, which is beneficial to reduce the construction difficulty and improve the construction precision. In this way, the entry of multiple sections of steel lining into the cave is completed, and then the multiple sections of steel lining are welded to complete the connection. Compared with the existing steel lining which adopts the cantilever assembly method, the steel lining construction process of the present application has high work efficiency and high construction precision.

[0053] The specific embodiments of the present application described above do not constitute a limitation on the scope of protection of the present application. Any various other corresponding changes and modifications made according to the technical concept of the present application shall be included in the scope of protection of the claims of the present application.

Claims

1. A process for constructing a steel lining of a cavern gas storage, characterized in that, The construction process comprises the following steps: Excavating surrounding rock with geological conditions of more than three levels to form a rock cave; Pouring concrete on the end and top of the first section of concrete lining; Laying a slide rail and placing the first section of steel lining on the slide rail through a bracket; After positioning the first section of steel lining, lifting the bracket using a support seat to make the bracket disengage from the slide rail and recycle the slide rail; Pouring concrete on the bottom of the first section of concrete lining; Repeating the above steps of pouring concrete on the top, recycling the slide rail and pouring concrete on the bottom to sequentially complete the assembly of all subsequent steel linings; When the next steel lining slides into the rock cave along the slide rail, aligning the two adjacent steel linings using edge butt joint clamps to complete the initial positioning of the steel lining; After aligning the two adjacent steel linings, removing the edge butt joint clamps and welding the two adjacent steel linings to form a weld seam; Placing a support frame on the inner wall of the steel lining to make the support frame support the steel lining, and then removing the support frame after all the steel linings are welded; Setting the top of the bracket as an arc surface consistent with the curvature of the steel lining to make the top of the bracket fully fit the outer wall of the steel lining; Setting the bottom of the bracket with a track wheel and sliding the track wheel into the slide rail; Keeping the distance between the first section of concrete lining and the edge of the steel lining above one meter.

2. The process for constructing a steel lining of a cavern gas storage according to claim 1, characterized in that, All processes are calibrated using a calibrated instrument to emit laser to calibrate the elevation and coordinates so that the central axes of all the steel linings are located on the same straight line.

3. The process for constructing a steel lining for a cavern gas storage according to claim 1, characterized in that, Performing heat treatment on the weld seam.

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