Construction structure of large pipe shed for advanced support of tunnel body passing through urban waste residue body

Abstract

This utility model discloses a construction structure for a large-pipe shed for advance support of a tunnel body passing under urban waste disposal sites. It includes the current construction section of the tunnel, where the surface is a waste disposal soil layer and both sides are hard rock layers. Multiple rings of large-pipe sheds are arranged along the tunnel excavation direction, with each ring overlapping the previous one. An enlarged excavation section, shaped like a trumpet, is arranged in front of the overlapping section. Multiple arch frames are erected within the enlarged excavation section, with each subsequent arch frame designed to be higher than the previous one. An excavation section is arranged on the overlapping section, with two steel frames erected on it as guide frames. The two steel frames are arranged at intervals, with the height of the first steel frame lower than the final arch frame in the enlarged excavation section. A height space is reserved between the final arch frame and the first steel frame, and the entire ring of large-pipe sheds is installed circumferentially within this height space. This invention effectively ensures the drilling space for large pipe sheds and reduces disturbance to large-volume waste materials, existing pipelines and structures.

Description

Technical Field

[0001] This utility model relates to the field of tunnel construction technology, and in particular to a tunnel body advanced support pipe shed construction structure for tunnels passing under urban waste disposal sites. It is applicable to tunnel projects where the tunnel body needs to pass under large-volume waste disposal sites and existing pipelines and structures such as septic tanks and drainage culverts. Background Technology

[0002] In current tunnel construction in my country, large pipe roof support is used for tunnels passing through spoil heaps or loose soil. Existing large pipe roof support technology requires guide walls and guide pipes at the tunnel entrance and a pipe roof working chamber inside the tunnel to ensure sufficient space for drilling rig positioning, drilling, and pipe installation. For large-section high-speed railway tunnels in mountainous cities, where the tunnel body passes under spoil heaps and is constrained by existing structures such as septic tanks and fiberglass culverts at the top, constructing a pipe roof working chamber in soft strata presents significant challenges and risks. The pipe roof working chamber typically needs to be 0.8–1m wider and approximately 8m longer than the normal initial support section. When constructing the working chamber in the spoil heap section, its excavation space is limited by the angle of the first ring of pipe roof. If the outward angle and length of the pipe roof are too large, it is easy to hit existing boundary structures. A large outward space outside the working chamber results in a large amount of backfill support and increases the risk of collapse of the spoil heap and loose soil. If the outer angle of the pipe shed in front of the work area is too small or the length is too short, it will affect the work area space, which in turn will affect the operating space and angle of the pipe shed drilling equipment, and will also be detrimental to the tunnel construction progress. Therefore, since the tunnel passes through the spoil heap and there are septic tanks and fiberglass pipe culverts on the top, it is necessary to explore a new pipe shed construction structure that can ensure the safety of the tunnel construction itself, ensure the tunnel construction progress, and not affect the surrounding pipelines and structures. Utility Model Content

[0003] To address the problems existing in the prior art, this utility model aims to provide a construction structure for advanced support of a large pipe shed for tunnels passing under urban waste disposal sites, so as to reduce disturbance to large-volume waste disposal sites, existing pipelines and structures, accelerate construction progress, and improve construction safety.

[0004] To achieve the above objectives, this utility model proposes a construction structure for advanced support of a large pipe shed for a tunnel body passing under urban waste disposal sites. The structure includes the current construction section of the tunnel, where the surface is a waste disposal soil layer, with hard rock layers on both sides. Existing pipelines and structures exist above the current construction section. Multiple rings of large pipe sheds are arranged along the tunnel excavation direction on the current construction section. Each ring of large pipe sheds overlaps with the previous ring. An enlarged excavation section is arranged in front of the overlap section, extending to the overlap section and forming a funnel shape to create working space for the large pipe sheds. Multiple arch frames are erected within the enlarged excavation section. The arch frames are evenly spaced front and rear, with each subsequent arch frame being raised relative to the preceding one. An excavation section is located close to the end of the widened section on the overlapping section. The excavation section extends along the tunnel excavation direction and is lower than the end of the widened section. Two steel frames are erected on the excavation section as guide frames. The two steel frames are spaced front and rear, with each subsequent steel frame being raised 5-10 cm relative to the preceding one. The height of the preceding steel frame is lower than the height of the final arch frame in the widened section. A height space is reserved between the final arch frame and the preceding steel frame for the installation of the large pipe shed. The entire ring of large pipe sheds is installed circumferentially within this height space.

[0005] In the above scheme: the length of the overlapping section is 3m, the length of the widened section is 4.8m, and a total of 8 arch frames are erected in the widened section. The distance between two adjacent arch frames is 60cm, and each arch frame is extended outward by 6.25cm. Finally, each arch frame is extended and raised by 50cm compared to the normal tunnel body. This uniform and reasonable arch frame arrangement not only ensures the stability of the widened section, but also facilitates the construction personnel to carry out the arch frame installation work quickly and orderly. Moreover, the reasonable widening method and support parameter design can effectively control the deformation of the surrounding rock and reduce surface settlement.

[0006] In the above scheme: the two steel frames are spaced 0.5m apart, and the latter steel frame is raised 5cm higher than the former. The two steel frames serve as guide frames, saving time in constructing guide walls.

[0007] In the above scheme: the entire ring of large pipe sheds is set within a 120° range of the arch, with a total of 40 pipe sheds in one ring. The circumferential spacing between adjacent large pipe sheds is 40cm, and each pipe is 15m long with an outward insertion angle of 6°. The 6° outward insertion angle design allows the large pipe sheds to be inserted more accurately into the surrounding rock in front, forming an effective advanced support arch.

[0008] In the above scheme: the upper 2-4m of the tunnel's current construction section is already within the spoil heap soil layer. Existing pipelines and structures include septic tanks and drainage culverts. The current construction section of the tunnel passes under the septic tanks and drainage culverts. The net distance between the bottom of the septic tank and the tunnel arch is 1.8m, and the net distance between the drainage culvert and the tunnel arch is 2.4m. This utility model effectively ensures the safety of the construction process while significantly reducing disturbance to large-volume spoil heaps and existing pipelines and structures, fully demonstrating the reliability and superiority of its structure.

[0009] In the above scheme, a single large pipe shed is composed of multiple segments, with adjacent segments connected by threaded connections. A reinforcing cage is also installed inside the large pipe shed. The threaded connections ensure that all segments of the large pipe shed are tightly connected, forming a unified structure that effectively resists deformation and damage to the surrounding rock, providing reliable mechanical protection for the large pipe shed to play its advanced support role.

[0010] The beneficial effects of this utility model are:

[0011] 1. The original design replaced the old design with a funnel-shaped excavation. The original design involved a long and deep excavation section for the pipe roof workshop, requiring the construction of guide walls and guide holes before pipe roof installation. After the large pipe roof was completed, a secondary arch erection and initial shotcreting were also necessary for the excavated section. This new design effectively ensures sufficient drilling space for the large pipe roof, reduces disturbance to large-volume spoil heaps, existing pipelines, and structures, and saves time on guide wall construction by using two steel frames as guide frames. Furthermore, the funnel-shaped excavation section eliminates the need for secondary arch erection after the large pipe roof construction, requiring only initial shotcreting. This significantly accelerates the on-site construction progress compared to the original design. 2. Multiple rings of large pipe roofs are arranged along the tunnel excavation direction, with each ring overlapping the previous one, forming a continuous and stable support structure. This support method effectively controls surrounding rock deformation, prevents collapses and other safety accidents, and provides reliable safety assurance for tunnel excavation. Attached Figure Description

[0012] Figure 1 This is a structural diagram of a pipe shed workshop constructed using the existing large pipe shed support technology.

[0013] Figure 2 This is a structural diagram of the tunnel face, drainage culverts, and septic tank.

[0014] Figure 3 This is a schematic diagram of the funnel-shaped excavation section and guide frame of this utility model. Detailed Implementation

[0015] like Figure 1As shown in Figure 3, a tunnel body advanced support pipe shed construction structure for tunnels passing under urban waste disposal sites is shown. The main body is the current construction section of the tunnel. The surface of the current construction section of the tunnel is a waste disposal soil layer, and the two sides are hard rock layers. There are existing pipelines and structures above the current construction section of the tunnel.

[0016] Multiple rings of large pipe sheds 1 are arranged along the tunnel excavation direction on the current construction section of the tunnel. Each ring of large pipe sheds 1 overlaps with the previous ring of large pipe sheds 1 at a junction 4. A widening section 2 is arranged in front of the junction 4, extending to the junction 4 in a funnel shape to form the working space for the large pipe sheds 1. Multiple arch frames 3 are erected in the widening section 2, with each arch frame 3 evenly spaced front to back, and each subsequent arch frame 3 is designed to be higher than the previous arch frame 3.

[0017] An excavation section is located on the overlapping section 4, close to the end of the widened section 2. The excavation section extends along the tunnel excavation direction and is lower than the height of the end of the widened section 2. Two steel frames 5 are erected on the excavation section as guide frames. The two steel frames 5 are arranged at intervals, with the latter steel frame 5 raised 5-10cm relative to the former steel frame 5. The height of the former steel frame 5 is lower than the height of the final arch frame 3 in the widened section 2. A height space is reserved between the final arch frame 3 and the former steel frame 5 for the installation of the large pipe shed 1. The entire ring of large pipe shed 1 is installed circumferentially within this height space.

[0018] Ideally, the overlap section 4 should be 3m long, and the extended section 2 should be 4.8m long. Eight arch frames 3 should be erected within the extended section 2, with a spacing of 60cm between adjacent arch frames 3. Each arch frame should extend outwards by 6.25cm, resulting in an arch frame 3 that is 50cm higher than the normal tunnel section. This uniform and reasonable arch frame arrangement ensures the stability of the extended section 2, facilitates quick and orderly arch frame installation by construction personnel, and the reasonable extended excavation method and support parameter design effectively control surrounding rock deformation and reduce surface settlement.

[0019] Ideally, the two steel frames 5 should be spaced 0.5m apart, with the latter steel frame 5 raised 5cm above the former. These two steel frames serve as guide frames, saving time compared to constructing guide walls.

[0020] Ideally, the entire ring of large pipe sheds 1 should be installed within a 120° range of the arch, with a total of 40 pipe sheds in one ring. The circumferential spacing between adjacent large pipe sheds 1 should be 40cm, and each pipe should be 15m long with an outward insertion angle of 6°. The 6° outward insertion angle design allows the large pipe sheds 1 to be inserted more accurately into the surrounding rock in front, forming an effective advanced support arch.

[0021] Ideally, the upper 2-4m of the tunnel's outline in the current construction section is already within the spoil heap soil layer. Existing pipelines and structures, including septic tank 6 and drainage culvert 7, are located beneath septic tank 6 and drainage culvert 7 in the current construction section. The net distance between the bottom of septic tank 6 and the tunnel arch is 1.8m, and the net distance between drainage culvert 7 and the tunnel arch is 2.4m. This invention effectively ensures the safety of the construction process while significantly reducing disturbance to large-volume spoil heaps and existing pipelines and structures, fully demonstrating the reliability and superiority of its structure.

[0022] Ideally, a single large pipe roof 1 is composed of multiple segments, with adjacent segments connected by threaded connections. A reinforcing cage is also installed inside the large pipe roof 1. Threaded connections ensure that all segments of the large pipe roof 1 are tightly connected, forming a unified structure that effectively resists deformation and damage to the surrounding rock, providing reliable mechanical protection for the large pipe roof to perform its advanced support function.

Claims

1. A pre-support pipe roof construction structure for a tunnel body passing under urban waste disposal sites, comprising the current construction section of the tunnel, wherein the surface of the current construction section is a waste disposal soil layer, the two sides are hard rock layers, and there are existing pipelines and structures above the current construction section of the tunnel, characterized in that: Multiple rings of large pipe sheds (1) are arranged along the tunnel excavation direction on the current construction section of the tunnel. Each ring of large pipe sheds (1) has an overlap section (4) with the previous ring of large pipe sheds (1). An enlarged excavation section (2) is arranged in front of the overlap section. The enlarged excavation section (2) extends to the overlap section (4) and is flared to form the working space of the large pipe sheds (1). Multiple arch frames (3) are erected in the enlarged excavation section (2). Each arch frame (3) is evenly spaced front and back, and the subsequent arch frame (3) is designed to be raised relative to the previous arch frame (3). An excavation section is arranged on the overlap section (4) close to the end of the enlarged excavation section (2). The excavation section extends along the tunnel excavation direction. The height of the excavation section is lower than the height of the end of the widening section (2). Two steel frames (5) are erected on the excavation section as guide frames. The two steel frames (5) are arranged at intervals, and the latter steel frame (5) is raised 5-10cm relative to the former steel frame (5). The height of the former steel frame (5) is lower than the height of the final arch frame (3) in the widening section (2). A height space is reserved between the final arch frame (3) and the former steel frame (5) for the installation of the large pipe shed (1). The entire ring of large pipe sheds (1) is installed circumferentially within this height space.

2. The tunnel body advanced support pipe roof construction structure for tunnels passing under urban waste disposal sites as described in claim 1, characterized in that: The length of the overlapping section (4) is 3m, the length of the widened section (2) is 4.8m, a total of 8 arch frames (3) are erected in the widened section (2), the distance between two adjacent arch frames (3) is 60cm, each arch frame is expanded outward by 6.25cm, and the final arch frame (3) is raised outward by 50cm compared with the normal tunnel body.

3. The tunnel body advanced support pipe roof construction structure for tunnels passing under urban waste disposal sites as described in claim 1, characterized in that: The two steel frames (5) are spaced 0.5m apart, and the latter steel frame (5) is raised 5cm relative to the former steel frame (5).

4. The tunnel body advanced support pipe roof construction structure for tunnels passing under urban waste disposal sites as described in claim 1, characterized in that: The entire ring of large pipe sheds (1) is set within a 120° range of the arch, with a total of 40 pipes in one ring. The circumferential spacing between the two adjacent large pipe sheds (1) is 40cm, the length of each pipe is 15m, and the external insertion angle is 6°.

5. The tunnel body advanced support pipe roof construction structure for tunnels passing under urban waste disposal sites according to claim 1, characterized in that: The upper 2-4m of the tunnel outline of the current construction section is already in the spoil soil layer. Existing pipelines and structures include septic tank (6) and drainage culvert (7). The current construction section of the tunnel passes under the septic tank (6) and drainage culvert (7). The net distance between the bottom of the septic tank (6) and the tunnel arch is 1.8m, and the net distance between the drainage culvert (7) and the tunnel arch is 2.4m.

6. The tunnel body advanced support pipe shed construction structure for tunnels passing under urban waste disposal sites according to claim 1, characterized in that: The single-tube shed (1) is composed of multiple segments, with adjacent segments connected by threaded connections. The shed (1) also contains a steel cage.

Images