Reinforcing structure for gas pipeline crossing subway deep foundation pit

Abstract

The present application relates to the technical field of foundation pit construction, and more particularly to a reinforcing structure for a gas pipeline crossing a subway deep foundation pit, comprising an excavation support reinforcing structure, a construction period reinforcing structure, a maintenance reinforcing structure, and a backfill support reinforcing structure, which supports and reinforces the gas pipeline during excavation to avoid deformation of the gas pipeline caused by the excavation process; the gas pipeline maintenance unit comprehensively inspects the exposed gas pipeline and reinforces the detected defects, thereby keeping the gas pipeline in good condition; the backfill support reinforcing structure comprises a backfill layer isolation lower plate arranged on the lower side of the gas pipeline, the upper end of the backfill layer isolation lower plate is provided with a bracket two cooperating with a bracket one, and a lifting support body is arranged between the upper end of the bracket two and the bracket one, thereby being able to adapt to the backfill construction and the soil condition after backfilling.

Description

Technical Field

[0001] This invention relates to the field of foundation pit construction technology, and in particular to a reinforcement structure for a gas pipeline crossing a deep foundation pit of a subway. Background Technology

[0002] Deep foundation pit excavation is a major part of underground engineering construction, which includes engineering survey, structural design, dewatering, excavation, and support. The construction of deep foundation pits should avoid interfering with the existing engineering structure as much as possible. After the deep foundation pit is excavated, concrete is poured on the side walls to provide side wall support. Steel supports are then installed between the side wall supports, and steel pipes are generally used for the steel supports.

[0003] When there is unavoidable pipeline interference during the excavation of deep foundation pits, such as gas pipelines, temporary pipelines are usually connected to avoid the excavation area of ​​the deep foundation pit. For pipelines with small outer diameter, low load and close to the edge of the deep foundation pit, connecting temporary pipelines is less costly and easier to construct. However, for main pipelines, connecting temporary pipelines is more costly and difficult to construct. Temporary protection is usually achieved by strengthening support, which includes in-situ suspension and the installation of protective pipes / frames.

[0004] This invention proposes a reinforcement structure for gas pipelines crossing deep foundation pits in subways that is easier to construct. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a reinforcement structure for gas pipelines crossing deep foundation pits of subways that is easier to construct and has less interference with gas pipelines.

[0006] This invention is achieved through the following technical solution: a reinforcement structure for a gas pipeline crossing a deep foundation pit of a subway, comprising an excavation support reinforcement structure, a construction period reinforcement structure, a maintenance reinforcement structure, and a backfill support reinforcement structure.

[0007] The excavation reinforcement structure includes a support beam installed on the lower side of the gas pipeline, a bracket is installed between the support beam and the gas pipeline, a fixing structure is installed between the lower end of the bracket and the support beam, and a matching support body is installed between the upper end of the bracket and the support beam.

[0008] The reinforcement structure during the construction period includes an anti-collision layer and an anti-corrosion layer installed outside the gas pipeline;

[0009] The maintenance and reinforcement structure includes a reinforcement structure for detecting defects in gas pipelines;

[0010] The backfill support and reinforcement structure includes a backfill layer isolation lower plate disposed on the lower side of the gas pipeline, a bracket second that cooperates with bracket one is disposed at the upper end of the backfill layer isolation lower plate, a lifting support body is disposed between the upper end of bracket second and bracket one, and the backfill support and reinforcement structure also includes a backfill layer isolation upper plate disposed on the upper side of the gas pipeline.

[0011] Furthermore, there are two support beams, which are parallel to the gas pipeline. The bracket includes a support beam disposed between the two support beams, and the fixing structure includes a mortar body disposed on the support beam.

[0012] Furthermore, the matching support body includes a mortar body II disposed at the upper end of the support beam.

[0013] Furthermore, the anti-collision layer includes an elastic layer disposed on the outside of the gas pipeline, the anti-corrosion layer includes a reflective layer disposed on the outside of the anti-collision layer, and the anti-corrosion layer also includes a waterproof layer disposed on the outside of the anti-collision layer.

[0014] Furthermore, the second bracket includes a base that cooperates with the lower isolation plate of the backfill layer, a heightening frame is provided on the base, an adjustment seat is provided at the upper end of the heightening frame, the lifting support is provided on the adjustment seat, and a gap detection device is provided between the upper end of the lifting support and the first bracket.

[0015] Furthermore, the spacing detection device includes a mortar body three disposed on the upper end of the lifting support body, the upper end surface of the lifting support body being an upward-facing arc apex.

[0016] The beneficial effects of this invention are as follows: A reinforcement structure for a gas pipeline crossing a deep subway foundation pit includes an excavation support reinforcement structure, a construction period reinforcement structure, a maintenance reinforcement structure, and a backfill support reinforcement structure. The excavation reinforcement structure includes a support beam installed below the gas pipeline. A bracket is installed between the support beam and the gas pipeline. A fixing structure is installed between the lower end of the bracket and the support beam, and a matching support body is installed between the upper end of the bracket and the support beam. This provides support and reinforcement for the gas pipeline during excavation, preventing deformation of the gas pipeline during the excavation process. The construction period reinforcement structure includes an anti-collision layer and an anti-corrosion layer installed outside the gas pipeline, protecting the exposed gas pipeline during construction. The gas pipeline is protected; the maintenance and reinforcement structure includes a reinforcement structure for detecting defects in the gas pipeline. The gas pipeline maintenance unit conducts a comprehensive inspection of the exposed gas pipeline and reinforces the detected defects to ensure the gas pipeline is in good condition. The backfill support and reinforcement structure includes a backfill layer isolation lower plate set on the lower side of the gas pipeline. The upper end of the backfill layer isolation lower plate is provided with a bracket second that cooperates with bracket one. A lifting support body is provided between the upper end of bracket second and bracket one. The backfill support and reinforcement structure also includes a backfill layer isolation upper plate set on the upper side of the gas pipeline. Reinforcement is carried out during and after backfilling to adapt to the backfilling construction and the soil conditions after backfilling. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of Example 1;

[0018] Figure 2 This is a schematic diagram of the cross-section of the support beam after installation;

[0019] Figure 3 This is a schematic diagram of the cross-section of bracket 1 after installation;

[0020] Figure 4 A schematic diagram for future earthwork excavation;

[0021] Figure 5 This is a schematic diagram of the support and reinforcement structure during normal excavation.

[0022] Figure 6 This is a schematic diagram of the reinforcement structure during the construction period;

[0023] Figure 7 For backfill support and reinforcement structure;

[0024] Figure 8 This is a schematic diagram of the bracket structure.

[0025] The components are as follows: 1. Original soil; 2. Side wall support; 3. Steel support; 4. Gas pipeline; 5. Reserved opening; 6. Support beam; 7. Bracket 1; 8. Excavation layer; 9. Isolation layer; 10. Reserved earthwork; 11. Elastic layer; 12. Mortar body 2; 13. Mortar body 1; 14. Excavated horizontal trench; 15. Reflective layer; 16. Waterproof layer; 17. Backfill soil; 18. Reserved pit; 19. Backfill layer isolation lower plate; 20. Bracket 2; 21. Backfill layer isolation upper plate; 22. Base; 23. Elevating frame; 24. Adjusting seat; 25. Lifting support body; 26. Arch top; 27. Adjusting rod; 28. Mortar body 3. Detailed Implementation

[0026] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1

[0029] like Figure 1-8 As shown, a reinforcement structure for a gas pipeline 4 crossing a deep foundation pit of a subway includes an excavation support reinforcement structure, a construction period reinforcement structure, a maintenance reinforcement structure, and a backfill support reinforcement structure.

[0030] Specifically, the excavation reinforcement structure includes a support beam 6 installed on the lower side of the gas pipeline 4. In this embodiment, the support beam 6 is composed of steel supports 3 and does not require additional fabrication. The ends of the support beam 6 are fixed to the side wall support 2. There are two support beams 6, which are parallel to the gas pipeline 4. The height difference between the two support beams 6 and the gas pipeline 4 is 200-300mm, providing sufficient space for the installation of bracket 7. Bracket 7 is installed between the support beam 6 and the gas pipeline 4. A fixing structure is installed between the lower end of bracket 7 and the support beam 6. A matching support body is installed between the upper end of bracket 7 and the support beam 6. Bracket 7 includes a support beam installed between the two support beams 6. The support beam is made of I-beams, which have good bending strength. The I-beams are laid flat, thus forming grooves on the upper and lower sides, which cooperate with mortar body 13 and mortar body 12. The fixing structure includes mortar body 13 piled on the support beam 6 and the matching support body. The system includes mortar body 2 12 stacked on the upper end of the support beam, and multiple brackets 7, which provide multi-point support for the gas pipeline 4, improving support stability. For easy detachment, there is an isolation layer 9 between the gas pipeline 4 and mortar body 2 12. The isolation layer 9 is made of 3-4 layers of non-woven fabric, which can weaken the bond between mortar body 2 12 and gas pipeline 4, thus facilitating detachment later. The upper end of mortar body 2 12 forms a groove that matches the gas pipeline 4, improving the support stability of the gas pipeline 4. Using mortar body 2 12 as a matching support, the fluidity of the mortar before curing is utilized for matching, which can eliminate the impact of construction on the gas pipeline 4, and also compensate for the errors caused during the installation of support beam 6 and bracket 7. It is also convenient to obtain materials and construct. There is a reserved opening 5 at the side wall support 2 corresponding to the gas pipeline 4. The side wall support 2 is not constructed at the reserved opening 5, thus avoiding the shear stress concentration between the side wall support 2 and the gas pipeline 4.

[0031] The reinforcement structure during construction includes an anti-collision layer and an anti-corrosion layer installed outside the gas pipeline 4. The anti-collision layer includes an elastic layer 11 wrapped around the outside of the gas pipeline 4. The elastic layer 11 is made of polyurethane foam with a thickness of 20-25mm. Its main function is to prevent splashes from impacting the gas pipeline 4 and to isolate the noise generated by the gas pipeline 4 itself. The anti-corrosion layer includes a reflective layer 15 wrapped around the anti-collision layer. The reflective layer 15 includes a white base layer and yellow reflective strips distributed on the base layer. The base layer is made of aluminum foil. The anti-corrosion layer also includes a waterproof layer 16 coated outside the anti-collision layer. The waterproof layer 16 is a PE film layer that can protect the reflective layer 15 and has a good waterproof effect. The yellow reflective strips serve as a warning to the measurement operators. Through the reinforcement structure during construction, the impact of the environment on the gas pipeline 4 can be reduced.

[0032] The maintenance and reinforcement structure includes the reinforcement structure for the defect detection area of ​​gas pipeline 4. After the deep foundation pit is excavated, the original buried gas pipeline 4 is exposed. The gas pipeline 4 maintenance personnel can conduct a comprehensive inspection of this section of gas pipeline 4 and then carry out reinforcement, including welding reinforcement of weak points and adjustment of high vibration areas, so that gas pipeline 4 is in good operating condition.

[0033] The backfill support reinforcement structure includes a backfill layer isolation lower plate 19 installed under the gas pipeline 4. In this embodiment, the backfill layer isolation lower plate 19 is a precast slab or mortar poured on site, corresponding to the position of bracket 7. A bracket 20 that cooperates with bracket 7 is installed on the upper end of the backfill layer isolation lower plate 19. A lifting support body 25 is installed between the upper end of bracket 20 and bracket 7. The bracket 20 includes a base 22 that cooperates with the backfill layer isolation lower plate 19. The base 22 is made of rectangular tube or channel steel. An extension frame 23 is fixed on the base 22. The extension frame 23 is made of rectangular tube or channel steel and has a structure that is wider at the bottom and narrower at the top, thus providing better stability. An adjustment seat 24, also made of rectangular tube, is fixed to the upper end of the extension frame 23. The lifting support body 25 is flexibly mounted on the adjustment seat 24 via adjustment rods 27. The adjustment rods 27 are threaded rods and are threadedly connected to the adjustment seat 24. There are 3-4 adjustment rods 27, evenly distributed along the length of the lifting support body. A spacing detection device is provided between the upper end of the support body 25 and the bracket 7 to prevent the rising of the lifting support body 25 from affecting the gas pipeline 4. The spacing detection device includes a mortar body 28 stacked on the upper end of the lifting support body 25. The upper surface of the lifting support body 25 is an upward-facing arc top 26, which matches the groove of the support beam. Due to the viscosity of the mortar itself, it can be stacked on the arc top 26. When the lifting support body 25 is lifted upward, the mortar body 28 is observed to be squeezed out, which proves that the lifting support body 25 has risen to the appropriate position, thus playing the role of spacing detection. The operation is convenient. After the mortar body 28 solidifies, it forms a stable support. The backfill support reinforcement structure also includes a backfill layer isolation plate 21 laid on the upper side of the gas pipeline 4. The backfill layer isolation plate 21 is made of precast slab. The distance between the backfill layer isolation plate 21 and the gas pipeline 4 is 1000-1500mm, which can form an isolation during the compaction process after backfilling and buffer the impact of the collapse of the backfill soil 17 on the gas pipeline 4 during subsequent use.

[0034] The reinforcement structure for the gas pipeline 4 crossing the deep foundation pit of the subway provided in this embodiment is constructed as follows:

[0035] Step 1: Excavate the original soil 1. The deep foundation pit is constructed by excavating and supporting layer by layer. During the excavation of the deep foundation pit, when the excavation layer 8 where the gas pipeline 4 is located is reached, a reserved soil 10 is reserved along the gas pipeline 4. The width of the reserved soil 10 is 4-5 times the outer diameter of the gas pipeline 4. The reserved soil 10 provides stable support for the gas pipeline 4 and avoids damage to the gas pipeline 4 during construction.

[0036] Step two: On both sides of the upper end of the reserved earthwork 10, use small machinery to precisely excavate support steps. Place support beams 6 at the support steps. Steel supports 3 are used for support beams 6. Then, fix the ends of the support beams 6 to the side wall support 2 to reduce construction intensity and prevent the support beams 6 from being suspended for extended periods, thereby reducing the risk of the suspended equipment colliding with the gas pipeline 4. Make an opening in the reserved earthwork 10 between the support beams 6 and the gas pipeline 4, so that the gas pipeline 4 is fully exposed at the opening. Wrap the gas pipeline 4 with steel supports 3 around its circumference or below. Four layers of non-woven fabric are used to form an isolation layer 9. Mortar 13 is applied to the support beam 6 opposite the opening. A support beam made of I-beams is inserted into the opening. Then, mortar 22 is piled up between the upper end of the support beam and the gas pipe 4 to increase the amount of mortar 212. The upper end of mortar 212 forms a groove that matches the gas pipe 4. Multiple openings are constructed along the length of the gas pipe 4. Multiple support beams 2 are then installed. The mixture is left to stand until mortar 13 and mortar 212 have cured, resulting in a temporary support with spaced distribution.

[0037] Step 3: A transverse trench 14 is excavated on the lower outer wall of the reserved earthwork 10 using small machinery. Then, the reserved earthwork 10 is excavated, causing it to collapse downwards as a whole during the excavation process, preventing it from pushing upwards onto the gas pipeline 4. After completely removing the reserved earthwork 10, the temporary supports formed in step 2 are used to reinforce and support the gas pipeline 4. The gas pipeline 4 is then cleaned, and maintenance personnel inspect this section of the gas pipeline 4, maintaining and reinforcing any defects to obtain a reinforced structure. This ensures that the gas pipeline 4 is in excellent condition for gas supply. The gas pipeline 4 is coated with a protective layer, wrapped with polyurethane foam to form an elastic layer 11, and then wrapped with aluminum foil to form a reflective layer 15. Finally, a PE film is wrapped around the reflective layer 15 to form a waterproof layer 16, thus forming a reinforcement structure during construction. It is worth noting that the support beam 6 plays three roles: first, it provides stable support for the support beam; second, it prevents the reserved soil 10 from tilting to the side during the excavation of the reserved soil 10; and third, it buffers the impact of vehicles / machinery from the side during the excavation of the reserved soil 10 and subsequent procedures.

[0038] Step 4: Prefabricating bracket 20. During the backfilling process after the deep foundation pit construction is completed, when backfilling to the soil layer where the gas pipeline 4 is located, a reserved pit 18 is formed along the gas pipeline 4. The distance between the bottom of the reserved pit 18 and the support beam 6 is 200mm. At the position of the support beam at the bottom of the reserved pit 18, the soil layer is compacted, and then 100*600*600 mortar is applied. After curing, the backfill layer isolation lower plate 19 is obtained. Bracket 20 is placed on the backfill layer isolation lower plate 19. The lower end of bracket 20 can be pre-embedded in the backfill layer isolation lower plate 19. Then, mortar body 3 28 is piled on the arc top 26. The height of the lifting support body 25 is adjusted by adjusting rod 27. When the mortar body 3 28 is squeezed out, the adjustment is stopped. Mortar is piled between the lifting support body 25 and the adjusting seat 24. After all the mortar has cured, a backfill support reinforcement structure that can replace the support beam 6 is obtained. The support is then removed. After beam 6 is moved out, the supporting beam is supported by bracket 2. The reinforcement structure during the construction period is removed. According to the design, the gas pipeline 4 is externally protected, such as with a sleeve. The reserved pit 18 is backfilled. During the backfilling process, the backfill layer isolation plate 21 is laid on the upper side of the gas pipeline 4. The backfill layer isolation plate 21 is laid continuously. The distance between the backfill layer isolation plate 21 and the gas pipeline 4 is 1000-1500mm. After the backfilling is completed, it is compacted. The reinforcement structure construction of the gas pipeline 4 crossing the deep foundation pit of the subway is completed. Reinforcement is carried out during and after backfilling to adapt to the backfilling construction and the soil conditions after backfilling. Soil conditions generally refer to the local settlement and deformation caused by uneven compaction or soil differences during later use. During the backfilling process, upward cables can also be connected to the ends of the supporting beam. After backfilling, a suspension frame is installed on the ground for suspension support.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A reinforcement structure for a gas pipeline crossing a deep foundation pit of a subway, characterized in that, This includes excavation support and reinforcement structures, construction period reinforcement structures, maintenance reinforcement structures, and backfill support and reinforcement structures. The excavation support and reinforcement structure includes a support beam installed on the lower side of the gas pipeline, a bracket is installed between the support beam and the gas pipeline, a fixing structure is installed between the lower end of the bracket and the support beam, and a matching support body is installed between the upper end of the bracket and the support beam. The reinforcement structure during the construction period includes an anti-collision layer and an anti-corrosion layer installed outside the gas pipeline; The maintenance and reinforcement structure includes a reinforcement structure for detecting defects in gas pipelines; The backfill support and reinforcement structure includes a lower backfill layer isolation plate disposed on the lower side of the gas pipeline, a second bracket that cooperates with the first bracket is disposed at the upper end of the lower backfill layer isolation plate, and a lifting support body is disposed between the upper end of the second bracket and the first bracket. The backfill support and reinforcement structure also includes an upper backfill layer isolation plate disposed on the upper side of the gas pipeline. The system comprises two support beams parallel to the gas pipeline. The bracket (first type) includes a support beam positioned between the two support beams. The support beam is made of I-beams, possessing good bending strength. The I-beams are laid flat, forming grooves on their upper and lower sides. The fixing structure includes a mortar body (first type) positioned on the support beams. The matching support body includes a mortar body (second type) positioned at the upper end of the support beam. An isolation layer, made of 3-4 layers of non-woven fabric, separates the gas pipeline from the mortar body (second type). The second bracket includes a base that mates with the lower isolation plate of the backfill layer. A heightening bracket is mounted on the base, and an adjustment seat is located at the upper end of the heightening bracket. A lifting support is mounted on the adjustment seat, and a gap detection device is installed between the upper end of the lifting support and the first bracket. The spacing detection device includes a mortar body three mounted on the upper end of the lifting support body. The upper surface of the lifting support body is an upward-facing arc, which mates with the groove of the support beam. Due to the viscosity of the mortar itself, it can accumulate on the arc. When the lifting support body is lifted upward, the mortar body three is observed to be squeezed out, indicating that the lifting support body has risen to the appropriate position, thus serving the purpose of spacing detection. After the mortar body three solidifies, it forms a stable support. The backfill support reinforcement structure also includes a backfill layer isolation slab laid on the upper side of the gas pipeline. The backfill layer isolation slab is made of precast slab, and the distance between the backfill layer isolation slab and the gas pipeline is 1000-1500mm. This allows it to form an isolation during the compaction process after backfilling and to buffer the impact of backfill collapse on the gas pipeline during subsequent use. The construction steps are as follows: Step 1: Excavate the original soil. The deep foundation pit is constructed by excavating and supporting layer by layer. During the excavation of the deep foundation pit, when the excavation layer where the gas pipeline is located is reached, a reserved soil is made along the gas pipeline below the gas pipeline. The width of the reserved soil is 4-5 times the outer diameter of the gas pipeline. The reserved soil provides stable support for the gas pipeline and avoids damage to the gas pipeline during construction. Step 2: On both sides of the upper end of the reserved earthwork, use small machinery to precisely excavate support steps. Place support beams at the support steps. The support beams are made of steel. Then fix the ends of the support beams to the side wall support. Make an opening in the reserved earthwork between the support beam and the gas pipeline, so that the gas pipeline is fully exposed at the opening. Wrap 3-4 layers of non-woven fabric around or below the gas pipeline to obtain an isolation layer. Apply mortar body one to the support beam opposite the opening. Install the support beam made of I-beam at the opening. Then pile mortar body two between the upper end of the support beam and the gas pipeline, increase the amount of mortar body two, so that the upper end of mortar body two forms a groove that matches the gas pipeline. Construct multiple openings along the length of the gas pipeline, and then install multiple support beams. Let it stand until mortar body one and mortar body two solidify to obtain temporary supports with intervals. Step 3: A horizontal trench is excavated at the lower outer wall of the reserved soil using small machinery. Then, the reserved soil is excavated, causing it to collapse downwards as a whole during the excavation process to prevent it from pushing the gas pipeline upwards. After the reserved soil is completely removed, the temporary support formed in Step 2 is used to reinforce and support the gas pipeline. The gas pipeline is then cleaned, and gas pipeline maintenance personnel inspect this section of the gas pipeline. Any defects are repaired and reinforced to obtain a maintenance and reinforcement structure, ensuring the gas pipeline is in excellent condition. A protective coating is applied to the entire gas pipeline, followed by wrapping it with polyurethane foam to obtain an elastic layer. Aluminum foil is then wrapped around the elastic layer to obtain a reflective layer, and a PE film layer is wrapped around the reflective layer to obtain a waterproof layer. This completes the construction period reinforcement structure. The support beam serves three purposes: first, to provide stable support for the support beam; second, to prevent the reserved soil from tilting to the side during the excavation of the reserved soil; and third, to buffer the impact of vehicles / machinery from the side during the excavation of the reserved soil and subsequent procedures. Step 4: Prefabricating bracket two. During the backfilling process after the deep foundation pit construction is completed, when backfilling to the soil layer where the gas pipeline is located, a reserved pit is formed along the gas pipeline. The distance between the bottom of the reserved pit and the support beam is 200mm. At the bottom of the reserved pit corresponding to the position of the support beam, the soil layer is compacted, and then 100*600*600 mortar is applied. After curing, the backfill layer isolation plate is obtained. Bracket two is placed on the backfill layer isolation plate. The lower end of bracket two can be pre-embedded in the backfill layer isolation plate. Then, mortar body three is piled on the arc top. The height of the lifting support body is adjusted by adjusting the adjusting rod. Observe that mortar body three is squeezed out, and stop adjusting. The process involves piling mortar between the lifting support and the adjusting seat. After all the mortar has cured, a backfill support reinforcement structure that can replace the support beam is obtained. The support beam is then removed and moved out. During this process, the support beam is supported by the bracket. The reinforcement structure is then removed, and the gas pipeline is externally protected according to the design. The reserved pit is then backfilled. During the backfilling process, a backfill layer isolation plate is laid on the upper side of the gas pipeline. The backfill layer isolation plate is laid continuously, and the distance between the backfill layer isolation plate and the gas pipeline is 1000-1500mm. After the backfilling is completed, it is compacted. The reinforcement structure construction for the gas pipeline crossing the deep foundation pit of the subway is now complete.

2. The reinforcement structure for a gas pipeline crossing a deep subway foundation pit according to claim 1, characterized in that, The anti-collision layer includes an elastic layer disposed on the outside of the gas pipeline, the anti-corrosion layer includes a reflective layer disposed on the outside of the anti-collision layer, and the anti-corrosion layer also includes a waterproof layer disposed on the outside of the anti-collision layer.

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