Construction process for steel lining of cavern gas storage

Abstract

The invention discloses a cavern gas storage steel lining construction technology, and relates to the technical field of tunnel construction, and the steel lining construction technology comprises the following steps: excavating surrounding rock to form a cavern; concrete pouring is conducted on the end and the top of the first section of concrete lining; a sliding rail is laid, the first section of steel lining is placed on the sliding rail through a bracket, and the first section of steel lining is pushed to enter the cavern; after the first section of steel lining is positioned, a supporting seat is used for jacking up the bracket so that the bracket can be separated from the sliding rail, and the sliding rail is recycled; concrete pouring is conducted on the bottom of the first section of concrete lining; and the steps are repeated, and subsequent splicing of all the steel linings is completed in sequence. Compared with an existing steel lining adopting a cantilever assembly mode, the steel lining construction process is high in working efficiency and high in construction precision.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction, and in particular to a steel lining construction process for a cavern gas storage. Background Art

[0002] The current underground gas storage structure is mainly a structure of surrounding rock + lining + steel lining. The lining and surrounding rock are the main force-bearing structures, and the steel lining is a sealing structure that plays a role in 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 will transmit a large internal pressure, the assembly accuracy in the cavern will affect the welding quality, and thus affect 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, narrow construction space and high construction precision requirements of steel lining, the current cantilever construction method is difficult to meet the construction precision requirements and the construction efficiency is low. Therefore, it is necessary to improve this to improve the construction precision and efficiency. Summary of the invention

[0004] The purpose of the present invention is to overcome the above technical deficiencies and propose a steel lining construction process for a cavern gas storage facility to solve the technical problem that the steel lining is constructed by a cantilever assembly process in the prior art, resulting in low construction accuracy and low work efficiency.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: The present invention provides a steel lining construction process for a cavern gas storage, the steel lining construction process comprising the following steps: Excavation of surrounding rock to form rock caves; Concrete the ends and top of the first section of concrete lining; Lay the slide rail, place the first section of the steel liner on the slide rail through the bracket, and push the first section of the steel liner into the rock cave; After positioning the first section of the steel liner, use the support seat to lift the bracket to separate the bracket from the slide rail and retract the slide rail; Concrete the bottom of the first concrete lining section; Repeat the above steps of top concrete pouring, slide rail recovery and bottom concrete pouring to complete the assembly of all subsequent steel liners in sequence.

[0006] In some embodiments, all processes are calibrated using a calibrator to emit laser light to calibrate the elevation and coordinates so that the central axes of all steel liners are located on the same straight line.

[0007] In some embodiments, when the next steel liner slides into the rock cave along the slide rail, two adjacent steel liners are aligned using edge docking clamps to complete the initial positioning of the steel liners.

[0008] In some embodiments, after two adjacent steel liners are aligned, the edge butt clamps are removed, and the two adjacent steel liners are welded to form a weld.

[0009] In some embodiments, the weld is heat treated.

[0010] In some embodiments, a support frame is placed on the inner wall of the steel liner so that the support frame supports the steel liner, and the support frame is removed after all the steel liners are welded.

[0011] In some embodiments, the top of the bracket is set to a curved surface consistent with the curvature of the steel liner, so that the top of the bracket is fully fitted with the outer wall of the steel liner.

[0012] In some embodiments, surrounding rock with geological conditions of level three or above is selected for excavation to form a cave.

[0013] In some embodiments, a rail wheel is disposed at the bottom of the bracket, and the rail wheel is slidably engaged with the slide rail.

[0014] In some embodiments, the distance between the edge of the first section of concrete and the edge of the steel lining is maintained at more than one meter.

[0015] Compared with the prior art, the steel lining construction process for the cavern gas storage provided by the present invention is to pour concrete on the end and top of the first section of concrete lining before the steel lining enters the cave. At this time, the construction space is large, which is convenient for concrete pouring construction and has high construction accuracy. Each section of the steel lining enters the cave by sliding on the slide rail. After entering the cave and positioning, concrete is poured on the bottom of the first section of the concrete lining, which helps to reduce the construction difficulty and improve the accuracy of the construction. By analogy, multiple sections of steel lining are completed to enter the cave, and then the multiple sections of steel lining are welded to complete the connection. Compared with the existing cantilever assembly method of steel lining, the steel lining construction process of the present invention has high work efficiency and high construction accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the first section of steel lining provided by an embodiment of the present invention after installation; Figure 2 yes Figure 1 A side view schematic diagram of Figure 3 is a schematic structural diagram of the connection between the bracket, the slide rail and the support seat provided in an embodiment of the present invention; Figure 4It is a schematic diagram of the structure when the middle steel lining and the first section steel lining provided by an embodiment of the present invention are welded; Figure 5 It is a schematic diagram of the structure when the terminal steel lining and the middle steel lining provided by an embodiment of the present invention are welded; Figure 6 It is a schematic diagram of the process flow of the steel lining construction process of the cavern gas storage provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] In order to solve the technical problem that the steel lining is constructed by a cantilever assembly process in the prior art, resulting in low construction precision and low work efficiency, the present invention provides a steel lining construction process for a cavern gas storage, which can achieve high steel lining construction efficiency and high construction precision.

[0019] See also Figure 1 , Figure 1 This is a structural schematic diagram of a steel lining construction process for a cavern gas storage facility in one embodiment of the present invention. The steel lining construction process for a cavern gas storage facility includes the following steps: S1: Excavation of surrounding rock to form a rock cave; Select the surrounding rock 20 with geological conditions of grade III or above. This kind of surrounding rock has strong compressive resistance, low risk of collapse after digging, and can be used for a long time. The geological conditions of the surrounding rock 20 can be detected using geological detection instruments. This is a conventional technology, and the specific details and steps are not redundantly described.

[0020] S2: pouring concrete at the end and top of the first section of concrete lining 1; The steel lining usually includes two bullet-shaped end steel liners and several cylindrical middle steel liners. The order of entering the cave is to first put one of the end steel liners into the cave, then put several middle steel liners into the cave in turn, and finally put the other end steel liners into the cave, and complete the splicing and concrete construction of adjacent steel liners in turn. Since all steel liners need to be covered with concrete lining, before the first section of steel lining 3 enters the cave, the top and end of the concrete lining 1 covering the first section of steel lining 3 can be poured first. At this time, there is no steel lining in the rock cave 2, and the construction space is large, which is conducive to improving construction efficiency and construction accuracy. In addition, the distance between the edge of the first section of concrete and the edge of the first section of steel lining 3 is kept above one meter, so that there is more concrete in the first section, which can form a stronger protective effect on the first section of steel lining 3.

[0021] S3: Lay the slide rail, place the first section of the steel lining 3 (end steel lining) on ​​the slide rail 5 through the bracket 4, and push the first section of the steel lining 3 into the rock cave 2; The slide rail 5 can be arranged along the extension direction of the rock cave 2, so that multiple sections of steel lining can be arranged along the extension direction of the rock cave. Multiple slide rails 5 can be laid as needed, and multiple slide rails 5 are placed in parallel. The bottom of the bracket 4 is placed on multiple slide rails 5, and the first section of the steel lining 3 is driven into the rock cave 2 by pushing the bracket 4, and the end and top of the first section of the steel lining 3 are attached to the top and top of the concrete lining 1 to position the end and top of the first section of the steel lining 3. A rail wheel 12 is arranged at the bottom of the bracket 4, 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 rock cave 2 along the slide rail 5.

[0022] S4: After positioning the first section of the steel liner 3, use the support seat 6 to lift the bracket 4 so that the bracket 4 is separated from the slide rail 5, so as to facilitate the recovery of the slide rail 5; The support seat 6 can be understood as a jack, which can lift the bracket 4 together with the first section of the steel liner 3 to make the bracket 4 separate from the slide rail 5, so as to facilitate the slide rail 5 to be pulled out of the cave 2 for the next section of the steel liner 30 to enter the cave. The support seat 6 can stay in place for subsequent construction use.

[0023] S5: Concrete pouring at the bottom of the first section of concrete lining 1 ( Figure 4 s shown); After the concrete pouring construction of the bottom of the first section of concrete lining 1 is completed, the first section of steel lining 3 can be completely covered with the concrete at the end and top of the first section of concrete lining 1 to provide support for the first section of steel lining 3 and to separate the first section of steel lining 3 from the surrounding rock 20 through concrete. The bottom of the concrete lining 1 is not poured at the beginning in order to leave a larger operating space for the first section of steel lining 3, so as to facilitate the positioning of the first section of steel lining 3 and the top and end of the concrete lining 1, which is conducive to improving work efficiency and construction accuracy.

[0024] S6: Repeat steps S2-S5 to complete the assembly of all subsequent steel liners in sequence; It should be emphasized that when pouring the concrete lining of the next section of the steel lining 30 (middle steel lining), only the top and the bottom need to be poured to cover and fix the middle steel lining 30 .

[0025] In one embodiment, see Figure 1All processes are calibrated by calibrating the elevation and coordinates by emitting lasers using a calibrator 11, so that the central axes of all steel liners are located on the same straight line, thereby improving the precision of splicing multiple steel liners. The rock cave 2 is also cylindrical, and the central axis of the rock cave 2 is also located on the same straight line as the central axes of all steel liners, so that the concrete thickness of the top and bottom of the concrete lining 1 is consistent, and the uniformity of the force on the steel lining is maintained.

[0026] In one embodiment, see Figure 2 and Figure 4 When the middle steel liner 30 slides into the cave 2 along the slide rail 5, the adjacent first section steel liner 3 is aligned with the middle steel liner 30 using the edge docking clamp 7 to complete the pre-positioning of the two steel liners. The edge docking clamp 7 is installed at the two end edges of the steel liner, and at least four edge docking clamps 7 are installed at each end edge. The multiple edge docking clamps 7 at the ends of the two steel liners close to each other are correspondingly connected to position the two adjacent steel liners, and the edge docking clamps 7 are removed before welding to facilitate welding.

[0027] In one embodiment, see Figure 4 After the two adjacent steel liners are aligned, the edge joint clamp 7 is removed, and the two adjacent steel liners are welded to form a weld 14. After the 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.

[0028] In one embodiment, the welds 14 between adjacent steel liners are heat treated to improve the structure and performance of the welded joint. Heat treatment can soften the hardened area, reduce hardness, improve impact toughness and creep limit, thereby preventing brittle failure of the welded structure. It can also eliminate and reduce stress generated during welding. Post-weld heat treatment can eliminate welding residual stress, prevent delayed cracking, and improve the reliability and life of the weldment.

[0029] In one embodiment, see Figure 2, the middle steel liner 30 is cylindrical. The steel liner is rolled and processed in the factory in advance and then transported to the construction site. Before the steel liner is officially put into use, a support frame can be installed inside the steel liner. The support frame is tightly 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 multiple steel liners can be completely matched when spliced, which is conducive to improving the splicing efficiency and the stability after splicing. The support frame is removed after all steel liners are welded. In this embodiment, the support frame includes two cross bars 8 and two vertical bars 9 that are rotatably connected head to tail in sequence, and the cross bars 8 and the vertical bars 9 are rotatably connected using a docking tenon 10. The length of the cross bar 8 and the vertical bar 9 can be set according to the inner diameter of the steel liner so that the four docking tenons 10 are tightly against the inner wall of the steel liner. The cross bar 8 and the vertical bar 9 can also be set as a retractable structure to meet the support of steel liners with different inner diameters.

[0030] In one embodiment, see Figure 2 and Figure 3 The steel liner 30 is cylindrical, and its outer wall is an arc surface. The steel liner 30 is placed on the top of the bracket 4. The top of the bracket 4 is set to an arc surface consistent with the curvature of the steel liner 30, so that the top of the bracket 4 is fully fitted with the outer wall of the steel liner 30. When the bracket 4 slides 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 may also be set to other shapes, such as an ellipse. In this case, the top of the bracket 4 can also be set to an elliptical surface to maintain fit with the steel liner. In addition, the number of brackets 4 is not limited, and one or more brackets can be set. Multiple brackets can support the steel liner 30 at the same time, and can slide on the slide rail 5 at the same time to cooperate to push the steel liner 30 into the cave 2.

[0031] In one embodiment, see Figure 5 After the middle steel liner 30 is installed, the end steel liner 40 can be pushed into the cave 2 in the above manner, and then welded to the other end of the middle steel liner 30 to complete the connection. The number of steel liners in this embodiment is three. In other embodiments, the number of middle steel liners 30 is not limited, for example, it can be two or more, which can be determined according to the construction depth.

[0032] In order to better understand the present invention, the following Figures 1 to 5 The technical solution of the present invention is described in detail: The steel lining construction process for the cavern gas storage provided by the present invention is to pour concrete on the end and top of the first section of concrete lining before the steel lining enters the cavern. At this time, the construction space is large, which is convenient for concrete pouring construction and has high construction accuracy. Each section of the steel lining enters the cavern by sliding on a slide rail. After entering the cave and positioning, concrete is poured on the bottom of the first section of the concrete lining, which helps to reduce the construction difficulty and improve the accuracy of the construction. By analogy, multiple sections of steel lining are completed to enter the cave, and then the multiple sections of steel lining are welded to complete the connection. Compared with the existing cantilever assembly method of steel lining, the steel lining construction process of the present invention has high work efficiency and high construction accuracy.

[0033] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A construction process for steel lining of a cavern gas storage, characterized in that: The construction process comprises the following steps: Excavation of surrounding rock to form rock caves; Concrete the ends and top of the first section of concrete lining; Lay the slide rail, place the first section of the steel liner on the slide rail through the bracket, and push the first section of the steel liner into the rock cave; After positioning the first section of the steel liner, use the support seat to lift the bracket to separate the bracket from the slide rail and retract the slide rail; Concrete the bottom of the first concrete lining section; Repeat the above steps of top concrete pouring, slide rail recovery and bottom concrete pouring to complete the assembly of all subsequent steel liners in sequence.

2. The steel lining construction process for cavern gas storage according to claim 1 is characterized in that: All processes are calibrated using a calibrator to emit laser light to calibrate the elevation and coordinates so that the center axes of all steel liners are on the same straight line.

3. The steel lining construction process for cavern gas storage according to claim 1 is characterized in that: When the next steel liner slides into the rock cave along the slide rail, the two adjacent steel liners are aligned using edge docking clamps to complete the initial positioning of the steel liners.

4. The steel lining construction process for cavern gas storage according to claim 3 is characterized in that: After the two adjacent steel liners are aligned, the edge butt clamps are removed and the two adjacent steel liners are welded to form a weld.

5. The steel lining construction process for cavern gas storage according to claim 4 is characterized in that: The weld is heat treated.

6. The steel lining construction process for cavern gas storage according to claim 1 is characterized in that: Use a support frame to be placed on the inner wall of the steel lining so that the support frame supports the steel lining, and remove the support frame after all steel liners are welded.

7. The steel lining construction process for cavern gas storage according to claim 1 is characterized in that: The top of the bracket is set to an arc surface consistent with the arc of the steel liner, so that the top of the bracket is fully fitted with the outer wall of the steel liner.

8. The steel lining construction process for cavern gas storage according to claim 1 is characterized in that: Select surrounding rock with geological conditions of level three or above for excavation to form a cave.

9. The steel lining construction process for cavern gas storage according to claim 1 is characterized in that: A rail wheel is arranged at the bottom of the bracket, and the rail wheel is slidably connected to the slide rail.

10. The steel lining construction process for cavern gas storage according to claim 1 is characterized in that: Keep the distance between the edge of the first section of concrete and the edge of the steel liner more than one meter.

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