Pipe shed forepoling construction device in shallow buried section of tunnel

Abstract

The utility model belongs to the technical field of tunnel construction, and particularly relates to a tunnel shallow buried section middle pipe shed advance support construction device which comprises a plurality of steel floral tubes inserted in the outer end face of a tunnel at intervals in an arc shape and a support assembly used for supporting and guiding the steel floral tubes. Each supporting assembly comprises two limiting blocks arranged along the axis of the steel floral tube at intervals and a guide cylinder horizontally arranged between the two limiting blocks, the centers of the guide cylinders and the centers of the two limiting blocks are located on the same straight line, the steel floral tube is arranged on the two limiting blocks and the guide cylinders in a penetrating mode, and the multiple supporting assemblies are arranged along the radian of the tunnel arch face in an array mode. A plurality of supporting assemblies jointly form an annular supporting connecting assembly, movable units arranged on the ground are hinged to the two ends of the supporting connecting assembly, and the two movable units move in the length direction of a tunnel. The problem that the construction efficiency is low due to the fact that an existing cast-in-place cover arch concrete guide wall on the outer end face of a tunnel cannot be recycled can be effectively solved.

Description

Technical Field

[0001] This utility model belongs to the field of tunnel construction technology, specifically relating to a pipe roof advanced support construction device in shallow buried tunnel sections. Background Technology

[0002] Advanced support can effectively control the deformation of surrounding rock during tunnel construction, ensuring tunnel construction safety. Through advanced support measures, the stability of weak and fractured surrounding rock can be improved, the stress condition of the tunnel support structure can be enhanced, deformation and plastic zones of the tunnel chamber can be reduced, and ground settlement can be suppressed. It is particularly effective in the pre-support of tunnels in weak sand layers. Furthermore, advanced support helps prevent the deformation of surrounding rock caused by excavation disturbance from exceeding the allowable range, thereby avoiding face instability and tunnel collapse, and reducing economic losses. Therefore, in open-cut tunnel construction, advanced support is usually required to stabilize the tunnel excavation face. For example, a Chinese patent discloses a pipe roof advanced support structure (patent publication number: CN221195064U), which uses advanced pipe roof grouting to form a continuous, uniform, and highly rigid reinforced zone at the tunnel arch (the junction of the fractured zone and the initial support), supporting the arch strata, protecting the tunnel face, and enabling one-way tunnel crossing, effectively shortening the construction period and achieving project management goals.

[0003] Although the above technical solution incorporates a grating steel frame to reinforce the grouting reinforcement zone of the tunnel roof and improve the stability of the support, in actual construction, before the steel pipes are inserted into the tunnel surrounding rock, a cast-in-place arched concrete guide wall needs to be poured at the tunnel's outer end face. This process includes installing the steel arch frame, tying stirrups, installing formwork, and pouring concrete. This not only significantly extends the construction period but also increases the manpower and material costs. Furthermore, the cast-in-place arched concrete guide wall cannot be reused; after completion, it is only used as a guide structure for the steel pipes. Therefore, it is necessary to propose a continuously reusable advanced support structure that can effectively guide the steel pipes. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a pipe roof advanced support construction device for shallow buried tunnel sections, so as to solve the problem that the cast-in-place arched concrete guide wall at the outer end of the tunnel cannot be reused, resulting in low construction efficiency.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A pipe roof pre-support construction device for shallow buried tunnel sections includes multiple steel pipes inserted at intervals along an arc on the outer end face of the tunnel, and a support assembly for supporting and guiding the steel pipes. The support assembly includes two limiting blocks spaced at intervals along the axis of the steel pipes and a guide cylinder horizontally positioned between the two limiting blocks. Both limiting blocks are vertically positioned, with one limiting block fixed to the outer end face of the tunnel. The center of the guide cylinder is collinear with the center of the two limiting blocks. The steel pipes pass through the two limiting blocks and the guide cylinder, with the inner diameter of the guide cylinder matching the outer diameter of the steel pipe. Multiple support assemblies are arranged in an array along the arc of the tunnel arch. Any two adjacent support assemblies are hinged together in the vertical plane, and each support assembly corresponds to a steel pipe. Multiple support assemblies together form a ring-shaped support connection assembly. Both ends of the support connection assembly are hinged to movable units positioned on the ground, and both movable units move along the length of the tunnel.

[0007] Furthermore, each of the guide cylinders is hinged at both ends to two corresponding limiting blocks, and the guide cylinders rotate in the vertical plane while the two limiting blocks move up and down. Both ends of the support connection assembly are hinged with a first connecting ear and a second connecting ear that are spaced apart. The first connecting ear is fixed to the surface of the movable unit and hinged to the corresponding limiting block, and the second connecting ear is detachably connected to the surface of the movable unit and hinged to the corresponding limiting block.

[0008] Furthermore, the movable unit includes a support housing and rollers movably disposed around the support housing. A hand hole communicating with the interior is opened on one side surface of the support housing, and a strip-shaped through hole is opened on the upper surface of the support housing along the tunnel length direction. The strip-shaped through hole communicates with the interior of the support housing, and the second connecting lug is detachably connected to the strip-shaped through hole by bolts and nuts.

[0009] Furthermore, the surfaces of the plurality of limiting blocks are provided with fixing ears that abut against the outer end face of the tunnel. The plurality of fixing ears are arranged in an array at intervals along the arc of the tunnel arch. Each fixing ear is provided with an anchor rod, and one end of the anchor rod is inserted into the tunnel.

[0010] Furthermore, lifting lugs are attached to the surfaces of multiple limiting blocks located away from the outer end face of the tunnel.

[0011] The beneficial effects of this utility model are as follows:

[0012] 1. This utility model uses multiple support components arranged in an arc array along the tunnel arch and fixed to the outer surface of the tunnel by multiple anchor rods. It can effectively support and guide the steel pipe. By adjusting the horizontal height of all the limiting blocks on the side away from the outer end face of the tunnel, the insertion angle of each steel pipe when inserted into the outer end face of the tunnel can also be indirectly adjusted. It can meet the actual construction process and can be reused, effectively reducing the construction cost.

[0013] Other advantages, objectives, and features of this invention will be set forth in the following description and will be apparent to those skilled in the art to some extent, or may be learned by practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0014] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the following drawings are provided for illustration:

[0015] Figure 1 This is a schematic diagram of the connection structure between the tunnel and the support assembly of this utility model;

[0016] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0017] Figure 3 for Figure 1 Enlarged view of point B in the middle;

[0018] Figure 4 This is a front view of the tunnel and support component connection structure of this utility model;

[0019] Figure 5 This is a top view of the tunnel and support component connection structure of this utility model.

[0020] The following labels are shown in the attached diagram:

[0021] 1. Tunnel, 2. Steel pipe, 3. Support assembly, 301. Limiting block, 302. Guide cylinder, 4. Movable unit, 401. Support shell, 402. Roller, 403. Handhole, 404. Strip through hole, 5. First connecting lug, 6. Second connecting lug, 7. Fixing lug, 8. Anchor bolt, 9. Lifting lug, 10. Track. Detailed Implementation

[0022] like Figures 1-5 As shown,

[0023] A pre-support construction device for pipe roof in shallow tunnel sections includes multiple steel pipes 2 inserted at arc intervals on the outer end face of the tunnel and a support assembly 3 for supporting and guiding the steel pipes 2. The support assembly 3 includes two limiting blocks 301 spaced apart along the axis of the steel pipes 2 and a guide cylinder 302 horizontally positioned between the two limiting blocks 301. Both limiting blocks 301 are vertically positioned, and each limiting block 301 has a circular hole with a diameter larger than that of the steel pipe 2. One limiting block 301 is fixedly positioned on the outer end face of the tunnel. The center of the circular hole of the guide cylinder 302 is collinear with the center of the circular hole of the two limiting blocks 301. The steel pipes 2 are respectively... The circular holes of the two limiting blocks 301 and the guide cylinder 302 are inserted, and the inner diameter of the guide cylinder 302 matches the outer diameter of the steel pipe 2. The support component 3 is provided in multiple pieces and arranged in an array along the arc of the tunnel arch. Any two adjacent support components 3 are hinged to each other in the vertical plane. In the same vertical plane, any two adjacent connecting blocks are hinged to each other. The number and position of the support components 3 correspond one-to-one with the steel pipe 2. The multiple support components 3 together form a ring-shaped support connection component. Both ends of the support connection component are hinged to movable units 4 set on the ground. Both movable units 4 move along the length of the tunnel 1.

[0024] As shown in the figure, when it is necessary to support and guide the steel pipe 2, the support connection assembly is first moved by the two movable units 4 until the arc center of the support connection assembly is on the same horizontal straight line as the arc center of the tunnel arch. Then, one side surface of the corresponding multiple connecting blocks is abutted against the outer end face of the tunnel and fixedly connected. At this time, the centers of the two limiting blocks 301 in each support assembly 3 and the corresponding guide cylinder 302 are all on the same straight line. Each steel pipe 2 can then be moved along the axial direction of the guide cylinder 302 and inserted into the tunnel 1. The end of the guide cylinder 302 away from the outer end face of the tunnel protrudes from the end of the guide pipe by a certain distance. Since the guide cylinder 302 is located between two adjacent limiting blocks 301... Fixed by the action of 01, the guide cylinder 302 can support and guide the inserted steel pipe 2, so that the steel pipe 2 can be inserted into the outer end face of the tunnel according to the prescribed movement route. The operation is simple and convenient. This construction device (short for a construction device for pipe roof advance support in shallow buried section of tunnel, consistent with the context) can effectively improve the construction efficiency of the steel pipe 2, and can also be reused. Just pull out the steel pipe 2 one by one and take it out from the guide cylinder 302, separate the multiple limiting blocks 301 from the outer end face of the tunnel, and the construction device can be moved to the next construction site. Compared with the cast-in-place arched concrete guide wall, this construction device can effectively reduce the construction cost.

[0025] In this embodiment, each guide cylinder 302 is hinged at both ends to two corresponding limiting blocks 301. When the two limiting blocks 301 move up and down, they will drive the guide cylinder 302 to rotate in the vertical plane. Both ends of the support connection assembly are hinged with a first connecting ear 5 and a second connecting ear 6 that are spaced apart. The first connecting ear 5 is fixed on the surface of the movable unit 4 and hinged to the corresponding limiting block 301. The first connecting ear 5 is located on the side close to the outer end face of the tunnel. The second connecting ear 6 is detachably connected to the surface of the movable unit 4 and hinged to the corresponding limiting block 301. The movable unit 4 includes a support housing 401 and four rollers 402 movably disposed around the support housing 401. Two tracks 10 are provided on the ground for the four rollers 402 to move along the length of the tunnel 1. A handhole 403 communicating with the interior is opened on the side surface of the support housing 401 away from the outer end face of the tunnel. A strip-shaped through hole 404 is opened on the upper surface of the support housing 401 along the length of the tunnel 1. The strip-shaped through hole 404 communicates with the interior of the support housing 401, and the second connecting lug 6 is detachably connected to the strip-shaped through hole 404 by bolts and nuts.

[0026] As shown in the figure, each guide cylinder 302 is hinged at both ends to two corresponding limiting blocks 301, and each guide cylinder 302 deflects in the vertical plane containing its axis. Therefore, after multiple limiting blocks 301 near the outer end face of the tunnel are fixedly connected to it, the bolts and nuts between the second connecting lug 6 and the support housing 401 can be removed, and all limiting blocks 301 away from the outer end face of the tunnel can be adjusted upwards or downwards simultaneously, so that the two limiting blocks 301 in each support assembly 3 are at different horizontal planes. At this time, each guide cylinder 302... The axis of the guide tube 302 has the same angle with the horizontal plane. Under the action of the guide tube 302, the subsequent steel pipe 2 can be inserted into the outer end face of the tunnel at a certain angle, which effectively improves the applicability of this construction device. The purpose of this is that the steel pipe 2 is not inserted horizontally into the tunnel 1 during the construction of the tunnel 1, but is inserted at a certain angle. The insertion angle of the steel pipe 2 must ensure an external insertion angle of 10 to 15 degrees. This can ensure that the small guide tube does not invade the tunnel clearance section, which conforms to the actual construction process and ensures the stability of the construction.

[0027] After adjusting the position of each limiting block 301 away from the outer end face of the tunnel, the second connecting ear 6 is fixedly connected to the support housing 401 again with bolts and nuts. The error caused by adjusting the position of the two limiting blocks 301 in each support component 3 can be solved by moving the second connecting ear 6 along the length of the tunnel 1 or by adding a shim between the second connecting ear 6 and the support housing 401. The strip-shaped through hole 404 allows the moved second connecting ear 6 to still be fixedly connected to the support housing 401 with bolts and nuts. The hand hole 403 is for the convenience of construction personnel to reach into the support housing 401 to install and remove bolts and nuts.

[0028] In this embodiment, a plurality of limiting blocks 301 are fixedly welded to the surface of a fixing lug 7 that abuts against the outer end face of the tunnel. The plurality of fixing lugs 7 are arranged in an array at intervals along the arc of the tunnel arch. An anchor rod 8 is inserted into each fixing lug 7, and one end of the anchor rod 8 is inserted into the tunnel 1, while the other end abuts against the end face of the fixing lug 7. The surface of the plurality of limiting blocks 301 that are away from the outer end face of the tunnel is connected to a lifting lug 9.

[0029] As shown in the figure, the setting of the fixing lug 7 allows for a detachable connection between the anchor rod 8 and the limiting block 301. By driving the anchor rod 8 into the outer end face of the tunnel, multiple limiting blocks 301 can be effectively fixed, making the operation simple and convenient. The setting of the lifting lug 9 facilitates the connection with the lifting equipment via slings, and allows for the simultaneous adjustment of the horizontal height of multiple limiting blocks 301 that are far from the outer end face of the tunnel. This indirectly adjusts the insertion angle of each guide cylinder 302 and steel flower pipe 2, improving construction efficiency.

[0030] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. A construction device for pipe roof advance support in shallow buried tunnel sections, comprising multiple steel pipes (2) inserted at arc intervals on the outer end face of the tunnel and a support assembly (3) for supporting and guiding the steel pipes (2), characterized in that: The support assembly (3) includes two limiting blocks (301) spaced apart along the axis of the steel pipe (2) and a guide cylinder (302) horizontally positioned between the two limiting blocks (301). Both limiting blocks (301) are vertically positioned, and one of the limiting blocks (301) is fixedly positioned on the outer end face of the tunnel. The center of the guide cylinder (302) is on the same straight line as the center of the two limiting blocks (301). The steel pipe (2) passes through the two limiting blocks (301) and the guide cylinder (302) respectively, and the guide cylinder (302)... The inner diameter of 02) matches the outer diameter of the steel pipe (2). The support component (3) is provided in multiple pieces and arranged in an array along the arc of the tunnel arch. Any two adjacent support components (3) are hinged to each other in the vertical plane, and the support components (3) correspond one-to-one with the steel pipe (2). Multiple support components (3) together form a ring-shaped support connection component. Both ends of the support connection component are hinged to movable units (4) set on the ground. Both movable units (4) move along the length of the tunnel (1).

2. The tunnel shallow-buried section pipe roof advance support construction device according to claim 1, characterized in that: Each guide cylinder (302) is hinged at both ends to two corresponding limiting blocks (301), and the guide cylinder (302) rotates in the vertical plane when the two limiting blocks (301) move up and down. Both ends of the support connection assembly are hinged with a first connecting ear (5) and a second connecting ear (6) that are spaced apart. The first connecting ear (5) is fixed on the surface of the movable unit (4) and hinged to the corresponding limiting block (301). The second connecting ear (6) is detachably connected to the surface of the movable unit (4) and hinged to the corresponding limiting block (301).

3. The tunnel shallow-buried section pipe roof advance support construction device according to claim 2, characterized in that: The movable unit (4) includes a support housing (401) and rollers (402) movably disposed around the support housing (401). A hand hole (403) communicating with the interior is provided on one side surface of the support housing (401). A strip-shaped through hole (404) is provided on the upper surface of the support housing (401) along the length direction of the tunnel (1). The strip-shaped through hole (404) communicates with the interior of the support housing (401), and the second connecting ear (6) is detachably connected to the strip-shaped through hole (404) by bolts and nuts.

4. The tunnel shallow-buried section pipe roof advance support construction device according to claim 3, characterized in that: The surfaces of the plurality of limiting blocks (301) are provided with fixing ears (7) that abut against the outer end face of the tunnel. The plurality of fixing ears (7) are arranged in an array at intervals along the arc of the tunnel arch. An anchor rod (8) is inserted into each fixing ear (7), and one end of the anchor rod (8) is inserted into the tunnel (1).

5. The tunnel shallow-buried section pipe roof advance support construction device according to claim 4, characterized in that: Multiple limiting blocks (301) located away from the outer end face of the tunnel are connected to lifting lugs (9).

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