Metro station tunnel arch opening reinforcing structure and construction method by combined permanent and temporary loop pipe roof construction

Abstract

The application relates to a permanent and temporary combined loop pipe roof underground excavation construction subway station tunnel arch opening reinforcing structure and a construction method, and belongs to the underground space construction technical field. The structure comprises a temporary support structure and a permanent support structure. The temporary support structure comprises pipe roof lining arranged on the lower sides of loop pipe roofs near the opening area on both sides, and door-shaped support steel frames are arranged under the pipe roof lining and fixed to the bottom of the tunnel. The permanent support structure comprises a loop reinforcing beam, a longitudinal reinforcing beam and pipe roof anchor bars. The longitudinal reinforcing beam is arranged along the cross sections of the loop pipe roofs on both sides of the opening area. One end of the pipe roof anchor bar is implanted into the cross section of the loop pipe roof, and the other end is implanted into the longitudinal reinforcing beam. Loop reinforcing beams are arranged under the two ends of the longitudinal reinforcing beam. The loop reinforcing beam is fixed to the loop pipe roof in the non-opening area through loop reinforcing beam anchor bars. The temporary support structure and the permanent support structure are combined, the tunnel arch structure can be reinforced under the condition of a large opening, a new stable stress system can be formed after the loop pipe roof is partially cut off, and the safety of the tunnel construction is ensured.

Description

Technical Field

[0001] This invention relates to a permanent and temporary combined circumferential pipe jacking tunnel arch arch opening reinforcement structure and construction method, belonging to the field of underground space construction technology. Background Technology

[0002] With the continuous expansion of urban underground space development, the construction of underground structures such as subway stations is increasing. During the construction of subway station tunnels, it is often necessary to set large openings in the arch to connect with ancillary facilities. However, existing construction technologies have many shortcomings in dealing with such large openings.

[0003] When constructing the Tomiya exit of the Shinjuku-Chuo Loop Line on the Metropolitan Expressway in Japan, shield tunneling technology was used for expansion. This involved using longitudinal pipe jacking for the expanded section of an existing shield tunnel, with a circumferential curved pipe jacking at the bottom. Both the upper and lower pipe jacks served as frozen supports before the underground entrance space was expanded. However, this method has significant limitations: firstly, the pipe jacking only serves as temporary frozen support and does not effectively integrate with the main structure, failing to achieve permanent integration and leading to repeated construction of the support structure, increasing project costs; secondly, it does not address the issue of cutting or severing the pipe jacking, leaving no solution for the problem of large openings in the arch causing damage to the pipe jacking's load-bearing capacity. Some projects incorporate local reinforcing components around the openings in the tunnel arch, such as adding steel bars or increasing the cross-sectional dimensions. However, this method also has obvious drawbacks: First, it only strengthens the local structure without considering the overall coordinated force with the surrounding pipe curtain and other structures, thus failing to effectively form a stable force-bearing system; second, it does not adequately consider the special characteristics of the circumferential pipe curtain, failing to solve the problem of the pipe curtain losing its load-bearing capacity due to openings, resulting in safety hazards in the connection between the pipe curtain and the main structure; third, it does not achieve permanent-temporary integration, and most of the strengthening components are used only once, causing resource waste and increasing project costs.

[0004] Existing technologies for addressing the issue of large openings in the arch of subway station tunnels suffer from several shortcomings, including the inability to achieve permanent-temporary integration, poor synergy between the pipe jacking and the main structure, imperfect force system conversion, high construction costs, and complex procedures, making it difficult to meet the needs of actual engineering projects. Therefore, there is an urgent need for a permanent-temporary integrated circumferential pipe jacking structure and construction method for reinforcing openings in the arch of subway station tunnels using cut-and-cover construction, which can effectively solve the aforementioned problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a permanent and temporary combined circumferential pipe jacking tunnel arch opening reinforcement structure and construction method for subway station tunnels. By combining temporary and permanent support structures, it is possible to complete the reinforcement of the tunnel arch structure under large opening conditions. After the circumferential pipe jacking is partially cut off, a new stable force system can be formed to ensure the safety of tunnel construction.

[0006] The permanent and temporary combined circumferential pipe curtain tunnel arch opening reinforcement structure of the subway station tunnel described in this invention includes a temporary support structure and a permanent support structure. The temporary support structure includes a pipe curtain lining set on the lower side of the circumferential pipe curtain on both sides of the area adjacent to the arch opening. A portal-shaped support steel frame is provided below the pipe curtain lining and is fixed to the bottom of the tunnel.

[0007] The permanent support structure includes circumferential reinforcing beams, longitudinal reinforcing beams, and pipe curtain anchor bars. The longitudinal reinforcing beams are arranged along the circumferential pipe curtain sections on both sides of the arch opening area. One end of the pipe curtain anchor bar is inserted into the circumferential pipe curtain section, and the other end is inserted into the longitudinal reinforcing beam. Circumferential reinforcing beams are provided below both ends of the longitudinal reinforcing beams. The circumferential reinforcing beams are fixed to the circumferential pipe curtain in the unopened area of ​​the arch through the circumferential reinforcing beam anchor bars.

[0008] Preferably, the portal frame support includes multiple vertically arranged lattice columns located below the tube curtain lining. Between the tube curtain lining and the lattice columns, from top to bottom, there are top leveling pads, steel beam bearing plates, longitudinal beams, and lattice column bearing plates. Between the lattice columns and the bottom of the tunnel, from top to bottom, there are lattice column pads and bottom leveling pads.

[0009] Preferably, a portal frame cross brace is provided between the two lattice columns, and a portal frame diagonal brace is provided between the portal frame cross brace and the lattice column.

[0010] Preferably, a pipe curtain sealing plate is provided between the longitudinal reinforcing beam and the circumferential pipe curtain section. The pipe curtain sealing plate has positioning holes for the installation of pipe curtain anchor bars, which can improve the connection strength.

[0011] Preferably, the longitudinal reinforcing beam is equipped with a pipe curtain fixing joint.

[0012] The construction method for the arch opening reinforcement structure of a subway station tunnel using a permanent-temporary combined circumferential pipe jacking method in the underground excavation construction, as described in this invention, includes the following steps:

[0013] S1. Plan the arch opening area, and pour the inner lining of the pipe curtain under the circumferential pipe curtain in the area adjacent to the arch opening.

[0014] S2. Install a portal-type support steel frame under the inner lining of the tube curtain on both sides of the arch opening area;

[0015] S3. Excavate the arch opening area from the ground down and cut off the circumferential pipe curtain within the arch opening area;

[0016] S4. Install pipe curtain sealing plates and longitudinal reinforcement beams, and fix them with pipe curtain anchor bars;

[0017] S5. Install circumferential reinforcing beams and fix them with anchor bars to form a new load-bearing system;

[0018] S6. After the permanent support structure meets the design requirements, the portal support steel frame is removed.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] (1) By combining temporary support structures and permanent support structures, this invention can strengthen the tunnel arch structure under the condition of opening in the large arch. After the circumferential pipe curtain is partially cut off, a new stable force system can be formed to ensure the safety of tunnel construction.

[0021] (2) Using circumferential pipe jacking as permanent support avoids the repeated construction and demolition of pipe jacking pre-support measures, reduces engineering materials and construction costs, and effectively lowers the project cost. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the temporary support structure before the opening of the pipe curtain in this invention.

[0023] Figure 2 for Figure 1 Top view,

[0024] Figure 3 This is a schematic diagram of the permanent and temporary support structure after the pipe curtain is perforated according to the present invention.

[0025] Figure 4 for Figure 3 Top view,

[0026] Figure 5 for Figure 3 Schematic diagram of the central ring reinforcement beam structure.

[0027] Figure 6 for Figure 3 Schematic diagram of the pipe curtain fixed joint structure of the longitudinal reinforcement beam.

[0028] Figure 7 This is a schematic diagram of the permanent support structure after the temporary support structure of this invention has been removed.

[0029] Figure 8 for Figure 7 Top view,

[0030] Figure 9 for Figure 8 Schematic diagram of section 1-1,

[0031] Figure 10 for Figure 9 Schematic diagram of section 2-2.

[0032] In the diagram: 1. Circumferential reinforcing beam; 2. Longitudinal reinforcing beam; 3. Circumferential pipe curtain; 4. Pipe curtain lining; 5. Main structure longitudinal beam; 6. Main structure column; 7. Pipe curtain anchor bar; 8. Pipe curtain sealing plate; 9. Pipe curtain fixing joint; 10. Circumferential reinforcing beam anchor bar; 11. Top leveling pad; 12. Steel beam bearing plate; 13. Longitudinal beam; 14. Lattice column bearing plate; 15. Portal frame cross brace; 16. Portal frame diagonal brace; 17. Lattice column; 18. Lattice column pad; 19. Bottom leveling pad; 20. Connecting steel plate; 21. Longitudinal connecting plate between lattice columns. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Based on the described embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure. It should be noted that in this invention, "both sides" refers to the left and right sides of the longitudinal direction of the underground space. In this invention, the circumferential pipe curtain 3 is the pipe group in CN202510416108.7, where the pipe jacking direction is perpendicular to the longitudinal direction of the underground space to be excavated. Multiple pipe groups are connected end-to-end to form an arched pipe group that spans the transverse direction of the underground space to be excavated.

[0034] Example 1

[0035] like Figures 3-6 As shown, the temporary and permanent support structure for the arch opening reinforcement of the subway station tunnel constructed by the combined circumferential pipe jacking of the present invention includes a temporary support structure and a permanent support structure. The temporary support structure is used to provide temporary support during the tunnel opening and will be removed after the permanent support structure is completed.

[0036] like Figures 1-2 As shown, the temporary support structure includes a pipe curtain liner 4 arranged circumferentially below the pipe curtain 3 on both sides of the area adjacent to the arch opening, which can achieve tunnel waterproofing. A portal-shaped support steel frame is provided below the pipe curtain liner 4, and the lower end of the portal-shaped support steel frame is fixed to the bottom of the tunnel.

[0037] The portal frame support includes multiple vertically arranged lattice columns 17 located below the tube liner 4. Between the tube liner 4 and the lattice columns 17, from top to bottom, are arranged a top leveling pad 11, a steel beam bearing plate 12, a longitudinal beam 13, and a lattice column bearing plate 14. Between the lattice columns 17 and the tunnel bottom, from top to bottom, are arranged lattice column pads 18 and bottom leveling pads 19 to further enhance the longitudinal stability of the portal frame support. A portal frame cross brace 15 is provided between the two lattice columns 17, and a portal frame diagonal brace 16 is provided between the portal frame cross brace 15 and the lattice column 17. Connecting steel plates 20 are provided between the portal frame diagonal brace 16 and the portal frame cross brace 15, and between the portal frame diagonal brace 16 and the lattice column 17.

[0038] like Figures 7-10 As shown, the permanent support structure includes a circumferential reinforcing beam 1, a longitudinal reinforcing beam 2, pipe curtain anchor bars 7, and welded pipe curtain sealing plates 8. Pipe curtain sealing plates 8 are welded to the cross-sections of the circumferential pipe curtain 3 on both sides of the arch opening area. Positioning holes are provided on the pipe curtain sealing plates 8. The pipe curtain sealing plates 8 are arranged side-by-side with the longitudinal reinforcing beam 2, and the longitudinal reinforcing beam 2 is equipped with pipe curtain fixing joints 9. One end of the pipe curtain anchor bar 7 is welded to the pipe curtain sealing plate 8, penetrates the positioning hole on the pipe curtain sealing plate 8, and is inserted into the cross-section of the circumferential pipe curtain 3; the other end is inserted into the pipe curtain fixing joint 9. Circumferential reinforcing beams 1 are located below both ends of the longitudinal reinforcing beam 2. The circumferential reinforcing beams 1 are fixed to the circumferential pipe curtain 3 in the unopened area of ​​the arch using circumferential reinforcing beam anchor bars 10, forming a new load-bearing system that transfers the load to the main beam-column system of the station.

[0039] The construction method for the arch opening reinforcement structure of a subway station tunnel using a permanent-temporary combined circumferential pipe jacking method in the underground excavation construction, as described in this invention, includes the following steps:

[0040] S1. Plan the arch opening area according to actual needs, and pour the pipe curtain lining 4 under the circumferential pipe curtain 3 in the area adjacent to the arch opening.

[0041] S2. After the inner lining of the tube curtain 4 reaches the design strength, the top leveling pad 11, steel beam bearing plate 12, longitudinal beam 13, lattice column bearing plate 14, lattice column 17, lattice column pad 18 and bottom leveling pad 19 are installed in sequence below the inner lining of the tube curtain 4 on both sides of the arch opening area. The longitudinal connecting plate 21 between the lattice columns 17 on the same side is installed. The portal frame cross brace 15 is installed between the lattice columns 17 on both sides. The portal frame diagonal brace 16 is installed between the portal frame cross brace 15 and the lattice column 17 to form a portal support steel frame.

[0042] S3. Excavate the arch opening area from the ground down to above the circumferential pipe curtain 3, and cut off the circumferential pipe curtain 3 within the arch opening area;

[0043] S4. Install the pipe curtain sealing plate 8 and the longitudinal reinforcement beam 2, and fix them with the help of the pipe curtain anchor bar 7;

[0044] S5. Install the circumferential reinforcing beam 1 and fix it with the anchor bars 10 of the circumferential reinforcing beam to form a new load-bearing system;

[0045] S6. After the permanent support structure meets the design requirements, the portal support steel frame is removed.

[0046] The descriptions of the orientation and relative positional relationships of the structures in this invention, such as descriptions of front, back, left, right, up, and down, do not constitute a limitation of this invention, but are merely for the convenience of description.

Claims

1. A reinforcement structure for the arch opening of a subway station tunnel constructed using a combination of permanent and temporary circumferential pipe jacking excavation, characterized in that: It includes temporary support structures and permanent support structures. The temporary support structure includes a pipe curtain lining (4) located on both sides of the circumferential pipe curtain (3) near the arch opening area. A portal-shaped support steel frame is provided below the pipe curtain lining (4) and the portal-shaped support steel frame is fixed to the bottom of the tunnel. The permanent support structure includes a circumferential reinforcing beam (1), a longitudinal reinforcing beam (2), and a pipe curtain anchor bar (7). The longitudinal reinforcing beam (2) is arranged along the cross-section of the circumferential pipe curtain (3) on both sides of the arch opening area. One end of the pipe curtain anchor bar (7) is inserted into the cross-section of the circumferential pipe curtain (3), and the other end is inserted into the longitudinal reinforcing beam (2). The circumferential reinforcing beam (1) is provided below both ends of the longitudinal reinforcing beam (2). The circumferential reinforcing beam (1) is fixed to the circumferential pipe curtain (3) in the unopened area of ​​the arch through the circumferential reinforcing beam anchor bar (10).

2. The arch opening reinforcement structure for subway station tunnels constructed using a combined permanent and temporary circumferential pipe jacking method according to claim 1, characterized in that, The portal frame includes multiple vertically arranged lattice columns (17) located below the tube curtain lining (4). Between the tube curtain lining (4) and the lattice columns (17), from top to bottom, there are top leveling pads (11), steel beam bearing plates (12), longitudinal beams (13) and lattice column bearing plates (14). A lattice column pad (18) and a bottom leveling pad (19) are installed between the lattice column (17) and the bottom of the tunnel from top to bottom.

3. The arch opening reinforcement structure for subway station tunnels constructed using a combined permanent and temporary circumferential pipe jacking method as described in claim 2, characterized in that... A portal frame cross brace (15) is provided between the two lattice columns (17), and a portal frame diagonal brace (16) is provided between the portal frame cross brace (15) and the lattice column (17).

4. The arch opening reinforcement structure for subway station tunnels using a combined permanent and temporary circumferential pipe jacking method in underground excavation as described in claim 1, characterized in that... A pipe curtain sealing plate (8) is provided between the longitudinal reinforcing beam (2) and the circumferential pipe curtain (3) section. The pipe curtain sealing plate (8) has positioning holes for the installation of pipe curtain anchor bars (7).

5. The arch opening reinforcement structure for subway station tunnels constructed using a combined permanent and temporary circumferential pipe jacking method according to claim 1, characterized in that, The longitudinal reinforcing beam (2) is equipped with a pipe curtain fixing joint (9).

6. A construction method for the arch reinforcement structure of a subway station tunnel using a combined permanent and temporary circumferential pipe jacking excavation method, characterized in that... Includes the following steps: S1. Plan the arch opening area, and pour the pipe curtain lining (4) under the circumferential pipe curtain (3) in the area adjacent to the arch opening. S2. Install a portal-type support steel frame below the inner lining (4) of the tube curtain on both sides of the arch opening area; S3. Excavate the arch opening area from the ground down and cut off the circumferential pipe curtain within the arch opening area (3). S4. Install the pipe curtain sealing plate (8) and longitudinal reinforcement beam (2), and fix them with the help of the pipe curtain anchor bar (7); S5. Install the circumferential reinforcing beam (1) and fix it with the help of the anchor bars (10) of the circumferential reinforcing beam to form a new load-bearing system; S6. After the permanent support structure meets the design requirements, the portal support steel frame is removed.

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