Permanent-temporary combined annular pipe-roofing underground excavation construction metro station tunnel arch opening reinforcing structure and construction method of permanent-temporary combined annular pipe-roofing underground excavation construction metro station tunnel arch opening reinforcing structure

Abstract

The invention relates to a permanent-temporary combined annular pipe-roofing underground excavation construction subway station tunnel arch opening reinforcing structure and a construction method, and belongs to the technical field of underground space construction. Comprising a temporary supporting structure and a permanent supporting structure, the temporary supporting structure comprises pipe roof linings arranged on the lower sides of annular pipe roofs on the two sides of an area close to a hole, and a door-shaped supporting steel frame is arranged below the pipe roof linings and fixed to the bottom of a tunnel; the permanent supporting structure comprises annular reinforcing beams, longitudinal reinforcing beams and pipe curtain anchor bars, the longitudinal reinforcing beams are arranged along the annular pipe curtain section on the two sides of the trepanning area, one ends of the pipe curtain anchor bars are implanted into the annular pipe curtain section, the other ends of the pipe curtain anchor bars are implanted into the longitudinal reinforcing beams, and the annular reinforcing beams are arranged below the two ends of the longitudinal reinforcing beams. The annular reinforcing beams are fixed to the annular pipe roofs in the non-perforated areas through the annular reinforcing beam anchor bars. The temporary supporting structure and the permanent supporting structure are combined, the tunnel arch structure can be reinforced under the condition of large holes, a new stable stress system can be formed after the annular pipe roofing is locally cut off, and tunnel construction safety is guaranteed.

Description

Technical Field

[0001] The invention relates to a subway station tunnel arch opening reinforcement structure and a construction method for a permanent and temporary combined annular pipe-roof dark excavation construction, belonging to the field of underground space construction technology. Background Art

[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, large openings are often required in the arch to connect to ancillary facilities. However, existing construction technologies have many shortcomings in handling such large openings.

[0003] Japan used shield tunnel expansion technology when constructing the Tomitani entrance and exit of the Metropolitan Expressway Central Ring Shinjuku Line. Based on the existing shield tunnel, a longitudinal pipe curtain was used in the expanded section, and a circular curved pipe curtain was used in the lower section. Both the upper and lower pipe curtains served as frozen supports, and then the underground entrance and exit space was expanded. However, this method has obvious limitations: first, the pipe curtain only serves as a temporary frozen support and does not form an effective connection with the main structure, making it impossible to achieve a permanent temporary connection, resulting in duplicate construction of the support structure and increasing project costs; second, it does not involve cutting or truncation of the pipe curtain, and there is no corresponding solution to the problem of large openings in the arch causing damage to the pipe curtain's bearing capacity. In some engineering projects, local reinforcement components are installed around the openings in the tunnel arch, such as adding steel bars and increasing the cross-sectional size. However, this method also has obvious defects: first, it only strengthens the local structural strength, without considering the overall coordinated force with the surrounding pipe curtains and other structures, and cannot effectively form a stable force system; second, it does not take into account the particularity of the circumferential pipe curtain, and cannot solve the problem of the pipe curtain losing its bearing capacity due to the opening, resulting in safety hazards in the connection between the pipe curtain and the main structure; third, the permanent and temporary combination is not achieved, and the reinforcement components are mostly disposable, resulting in waste of resources and increased project costs.

[0004] Existing technologies for addressing large openings in subway station tunnel arches suffer from shortcomings such as an inability to achieve a permanent / temporary combination, poor coordination between the pipe roof and the main structure, imperfect force system conversion, high construction costs, and complex processes, making them difficult to meet actual engineering requirements. Therefore, a subway station tunnel arch opening reinforcement structure and construction method for circumferential pipe roof dark excavation construction, which effectively addresses these issues, is urgently needed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: to overcome the shortcomings of the existing technology and provide a subway station tunnel arch opening reinforcement structure and construction method for underground excavation construction of a ring-shaped pipe curtain combined with permanent and temporary support structures. By combining temporary support structures with permanent support structures, the tunnel arch structure can be reinforced under large opening conditions. After the ring-shaped pipe curtain is partially cut off, a new stable force system can be formed to ensure the safety of tunnel construction.

[0006] The subway station tunnel arch opening reinforcement structure of the present invention, which is constructed by a circumferential pipe-roofed tunnel with a combination of permanent and temporary structures, includes a temporary support structure and a permanent support structure. The temporary support structure includes a pipe-roof lining provided on the underside of the circumferential pipe-roofed tunnels on both sides of the arch opening adjacent to the tunnel. A portal-shaped support steel frame is provided below the pipe-roof lining and is fixed to the tunnel bottom.

[0007] The permanent support structure includes circumferential reinforcement beams, longitudinal reinforcement beams and pipe curtain anchor bars. The longitudinal reinforcement 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 embedded in the circumferential pipe curtain section, and the other end is embedded in the longitudinal reinforcement beam. Circumferential reinforcement beams are provided below both ends of the longitudinal reinforcement beams. The circumferential reinforcement beams are fixed to the circumferential pipe curtain in the unopened area of the arch through the circumferential reinforcement beam anchor bars.

[0008] Preferably, the portal support steel frame includes a plurality of vertically arranged lattice columns located below the pipe curtain lining, and a top leveling pad, a steel beam pressure plate, a longitudinal beam and a lattice column pressure plate are sequentially provided between the pipe curtain lining and the lattice column from top to bottom; a lattice column pad and a bottom leveling pad are sequentially provided between the lattice column and the bottom of the tunnel from top to bottom.

[0009] Preferably, a portal frame cross brace is provided between the lattice columns on both sides, and a portal frame diagonal brace is provided between the portal frame cross brace and the lattice columns.

[0010] Preferably, a pipe curtain blocking plate is provided between the longitudinal reinforcement beam and the annular pipe curtain section, and the pipe curtain blocking plate is provided with positioning holes for installing the pipe curtain anchor bars, which can improve the connection strength.

[0011] Preferably, the longitudinal reinforcement beam is provided with a pipe-roof fixing joint.

[0012] The construction method of the subway station tunnel arch opening reinforcement structure constructed by the annular pipe-roof concealed excavation with a combination of permanent and temporary construction according to the present invention comprises the following steps:

[0013] S1. Plan the arch opening area and cast the pipe curtain lining in the vicinity of the arch opening toward the underside of the pipe curtain;

[0014] S2. Install the door-shaped support steel frame below the pipe curtain lining on both sides of the arch opening area;

[0015] S3. Dig the arch opening area from the ground downwards and cut off the annular pipe curtain within the arch opening area;

[0016] S4. Install the pipe-roof blocking plate and longitudinal reinforcement beam, and fix them with the help of pipe-roof anchor bars;

[0017] S5. Install the circumferential reinforcement beam and fix it with the help of the anchor bars to form a new bearing system;

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

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) The present invention combines a temporary support structure with a permanent support structure to achieve the reinforcement of the tunnel arch structure under the condition of a large arch opening. After the annular pipe curtain is partially cut off, a new stable force system can be formed to ensure the safety of tunnel construction.

[0021] (2) The use of circumferential pipe curtains as permanent support avoids the repeated construction and removal of pipe curtain pre-support measures, reduces engineering materials and construction costs, and effectively reduces project costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the temporary support structure before the tube curtain is opened.

[0023] Figure 2 for Figure 1 A top view of

[0024] Figure 3 This is a schematic diagram of the permanent and temporary combined support structure after the tube curtain is opened in the present invention.

[0025] Figure 4 for Figure 3 A top view of

[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-roof fixed joint structure of the middle longitudinal reinforcement beam.

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

[0029] Figure 8 for Figure 7 A top view of

[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 figure: 1. Circumferential reinforcement beam; 2. Longitudinal reinforcement 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 blocking plate; 9. Pipe curtain fixing joint; 10. Circumferential reinforcement beam anchor bar; 11. Top leveling pad; 12. Steel beam bearing plate; 13. Longitudinal beam; 14. Lattice column bearing plate; 15. Portal cross brace; 16. Portal 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 DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure. It should be noted that the two sides in the present invention refer to the left and right sides of the longitudinal direction of the underground space. The annular pipe curtain 3 in the present invention is the pipe body group in CN202510416108.7. The pipe jacking direction in the pipe body group is perpendicular to the longitudinal direction of the underground space to be excavated. Multiple pipe body groups are connected end to end in sequence to form an arched pipe body group spanning the transverse direction of the underground space to be excavated.

[0034] Example 1

[0035] like Figure 3-Figure 6 As shown, the subway station tunnel arch opening reinforcement structure of the permanent and temporary combined annular pipe-roof dark excavation construction described in 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 Figure 1-Figure 2 As shown, the temporary support structure includes a pipe curtain liner 4, located on the underside of the pipe curtain 3 on both sides of the arch opening near the area, to achieve tunnel waterproofing. A gate-shaped support steel frame is installed below the pipe curtain liner 4, with its lower end fixed to the tunnel floor.

[0037] The portal support steel frame consists of multiple vertically arranged lattice columns 17 located below the pipe curtain lining 4. Between the pipe curtain lining 4 and the lattice columns 17, top leveling pads 11, steel beam bearing plates 12, longitudinal beams 13, and lattice column bearing plates 14 are positioned, from top to bottom. Between the lattice columns 17 and the tunnel floor, lattice column pads 18 and bottom leveling pads 19 are positioned, from top to bottom. This further enhances the longitudinal stability of the portal support steel frame. A portal cross brace 15 is positioned between the lattice columns 17 on both sides, and a portal diagonal brace 16 is positioned between the portal cross brace 15 and the lattice columns 17. Connecting steel plates 20 are provided between the portal diagonal brace 16 and the portal cross brace 15, and between the portal diagonal brace 16 and the lattice columns 17.

[0038] like Figure 7-10 As shown, the permanent support structure includes a circumferential reinforcement beam 1, a longitudinal reinforcement beam 2, pipe curtain anchor bars 7 and a welded pipe curtain blocking plate 8. The pipe curtain blocking plates 8 are welded to the sections of the circumferential pipe curtain 3 on both sides of the arch opening area, and positioning holes are opened on the pipe curtain blocking plates 8. The pipe curtain blocking plates 8 are arranged side by side with the longitudinal reinforcement beam 2, and the longitudinal reinforcement beam 2 is provided with a pipe curtain fixing joint 9. One end of the pipe curtain anchor bar 7 is welded to the pipe curtain blocking plate 8, passes through the positioning hole on the pipe curtain blocking plate 8 and is implanted into the section of the circumferential pipe curtain 3, and the other end is implanted into the pipe curtain fixing joint 9. Circumferential reinforcement beams 1 are provided below both ends of the longitudinal reinforcement beam 2. The circumferential reinforcement beam 1 is fixed to the circumferential pipe curtain 3 in the unopened area of the arch with the help of circumferential reinforcement beam anchor bars 10, forming a new bearing system to transfer the load to the main beam-column system of the station.

[0039] The construction method of the subway station tunnel arch opening reinforcement structure constructed by the annular pipe-roof concealed excavation with a combination of permanent and temporary construction according to the present invention comprises the following steps:

[0040] S1. Plan the arch opening area according to actual needs, and cast the pipe curtain lining 4 in the vicinity of the arch opening toward the lower side of the pipe curtain 3;

[0041] S2. After the pipe curtain lining 4 reaches the designed strength, the top leveling pads 11, steel beam bearing plates 12, longitudinal beams 13, lattice column bearing plates 14, lattice columns 17, lattice column pads 18 and bottom leveling pads 19 are sequentially installed below the pipe curtain lining 4 on both sides of the arch opening area. The longitudinal connecting plates 21 between the lattice columns 17 on the same side are installed. The portal frame cross braces 15 are installed between the lattice columns 17 on both sides. The portal frame diagonal braces 16 are installed between the portal frame cross braces 15 and the lattice columns 17 to form a portal support steel frame.

[0042] S3, digging the arch opening area from the ground down to the top of the annular pipe curtain 3, and cutting off the annular pipe curtain 3 within the arch opening area;

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

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

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

[0046] The description of the direction and relative position relationship of the structure in the present invention, such as the description of front, back, left, right, up and down, does not constitute a limitation of the present invention and is only for the convenience of description.

Claims

1. The arch opening reinforcement structure of the subway station tunnel constructed with a circular pipe-roof and dark excavation combined with permanent and temporary construction is characterized by: It includes a temporary support structure and a permanent support structure. The temporary support structure includes a pipe curtain lining (4) arranged on the lower side of the circumferential pipe curtain (3) on both sides of the adjacent area of the arch opening. A door-shaped support steel frame is provided below the pipe curtain lining (4). The door-shaped support steel frame is fixed to the bottom of the tunnel. The permanent support structure includes a circumferential reinforcement beam (1), a longitudinal reinforcement beam (2) and a pipe curtain anchor bar (7). The longitudinal reinforcement beam (2) is arranged along the circumferential pipe curtain (3) sections on both sides of the arch opening area. One end of the pipe curtain anchor bar (7) is embedded in the circumferential pipe curtain (3) section, and the other end is embedded in the longitudinal reinforcement beam (2). Circumferential reinforcement beams (1) are provided below both ends of the longitudinal reinforcement beam (2). The circumferential reinforcement beam (1) is fixed to the circumferential pipe curtain (3) in the arch non-opening area through the circumferential reinforcement beam anchor bar (10).

2. The subway station tunnel arch opening reinforcement structure constructed by the annular pipe-roof concealed excavation with a combination of permanent and temporary construction according to claim 1 is characterized in that: The portal support steel frame includes a plurality of vertically arranged lattice columns (17) located below the pipe curtain lining (4), and a top leveling pad (11), a steel beam pressure plate (12), a longitudinal beam (13) and a lattice column pressure plate (14) are sequentially provided between the pipe curtain lining (4) and the lattice columns (17) from top to bottom; A lattice column pad (18) and a bottom leveling pad (19) are sequentially provided between the lattice column (17) and the tunnel bottom from top to bottom.

3. The subway station tunnel arch opening reinforcement structure constructed by the annular pipe-roof concealed excavation and permanent and temporary combined construction according to claim 2 is characterized in that: A portal frame cross brace (15) is provided between the lattice columns (17) on both sides, and a portal frame diagonal brace (16) is provided between the portal frame cross brace (15) and the lattice columns (17).

4. The subway station tunnel arch opening reinforcement structure constructed with a circumferential pipe-roof and concealed excavation combined with permanent and temporary construction according to claim 1 is characterized in that: A pipe curtain blocking plate (8) is provided between the longitudinal reinforcement beam (2) and the annular pipe curtain (3) section, and the pipe curtain blocking plate (8) is provided with positioning holes for installing the pipe curtain anchor bars (7).

5. The subway station tunnel arch opening reinforcement structure constructed by the annular pipe-roof concealed excavation and permanent and temporary combined construction according to claim 1 is characterized in that: The longitudinal reinforcement beam (2) is provided with a pipe curtain fixing joint (9).

6. A construction method for a subway station tunnel arch opening reinforcement structure using a combination of permanent and temporary annular pipe-roof concealed excavation, characterized in that: The steps include: S1, planning the arch opening area, and pouring the pipe curtain lining (4) around the lower side of the pipe curtain (3) in the area adjacent to the arch opening; S2, installing a door-shaped support steel frame below the tube curtain lining (4) on both sides of the arch opening area; S3, digging the arch opening area from the ground downwards, and cutting off the annular pipe curtain (3) within the arch opening area; S4, installing the pipe curtain blocking plate (8) and the longitudinal reinforcement beam (2), and fixing them with the help of the pipe curtain anchor bars (7); S5, installing the circumferential reinforcement beam (1), and fixing it with the help of the circumferential reinforcement beam anchor bars (10) to form a new bearing system; S6. After the permanent support structure meets the design requirements, remove the portal support steel frame.

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