Multi-layer fiber concrete arched reinforcing structure for soft rock tunnel

Abstract

The utility model relates to the field of tunnel engineering, and discloses a soft rock tunnel multi-layer fiber concrete arched reinforcing structure which comprises an initial sealing control layer, a waterproof and drainage protection layer, an annular reinforcing layer and a flat sealing layer. The waterproof and drainage protection layer comprises a waterproof sealing layer and a drainage pipe network layer; the annular reinforcing layer comprises a plurality of groove reinforcing belts, fiber concrete and anchoring parts. Deformation of surrounding rocks of the soft rock tunnel can be effectively controlled, adaptability of the supporting structure to changes of the surrounding rocks is improved, the problem that water seepage is prone to occurring at the joints of the waterproof plates is effectively solved, and overall stability and construction efficiency of the supporting structure are improved.

Description

Technical Field

[0001] The utility model relates to the field of tunnel engineering, and particularly relates to a multi-layer fiber concrete arch reinforcement structure for soft rock tunnels. Background Technique

[0002] The construction of soft rock tunnels often faces problems such as low surrounding rock strength, poor self-stabilizing ability, and complex hydrogeological conditions. If not properly handled, disasters such as landslides and cave-ins will be triggered. Therefore, the structural stability and waterproofing are crucial for the construction of soft rock tunnels. In current tunnel construction projects, the composite lining technology is mostly adopted. After the tunnel excavation is completed, usually, a steel frame plus shotcrete and wire mesh is used as the initial support measure first, and then a reinforced concrete layer is integrally cast to form the secondary lining. A geotextile and a waterproof board are laid between the two layers as the waterproof layer. However, it is very difficult for the composite lining to achieve a perfect fit between the various structural layers of the lining, and it cannot effectively adapt to the deformation of the surrounding rock. It is difficult to handle the lap joints of the waterproof board, increasing the risk of water seepage, which in turn leads to the convergence deformation of the inner and outer linings, and even cracking, seriously reducing the durability and waterproofness of the tunnel, etc., affecting the normal use of the tunnel.

[0003] To solve the above problems, a multi-layer fiber concrete arch reinforcement structure for soft rock tunnels is proposed in this application. Content of the Utility Model

[0004] The purpose of the utility model is to provide a multi-layer fiber concrete arch reinforcement structure for soft rock tunnels to solve the problems of insufficient adaptability of the support structure to the changes of the surrounding rock and easy water seepage at the joints of the waterproof board in the prior art as mentioned in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A multi-layer fiber concrete arch reinforcement structure for soft rock tunnels, which includes an initial closed control layer, a waterproof and drainage protection layer, a circular reinforcement layer, and a flat closed layer; the initial closed control layer, the waterproof and drainage protection layer, the circular reinforcement layer, and the flat closed layer are sequentially stacked from the surrounding rock towards the inside of the tunnel to form an arch structure.

[0006] The initial closed control layer is attached to the tunnel surrounding rock, and the face of the tunnel is quickly closed by spraying fiber concrete to control the deformation of the surrounding rock. The fiber material can be polypropylene fiber, steel fiber, or basalt fiber, which can be selected according to the on-site construction requirements.

[0007] The waterproof and drainage protection layer is arranged between the initial closed control layer and the circular reinforcement layer, and includes a waterproof sealing layer and a drainage pipe network layer; the waterproof sealing layer is composed of a polymer spray waterproof structure and a geotextile; the drainage pipe network layer includes a circumferential drain pipe, a longitudinal drain pipe, and a transverse drain pipe.

[0008] Furthermore, a polymer spray waterproof structure is arranged on the tunnel crown, and geotextiles are arranged at the tunnel springing and invert. The two are connected by a waterproof membrane. The circumferential drain pipe and the longitudinal drain pipe are respectively arranged evenly along the circumferential and longitudinal directions of the tunnel. The water in the circumferential drain pipe and the longitudinal drain pipe converges to the transverse drain pipe at the corner of the side wall, and then is discharged from the structure body.

[0009] The annular reinforcement layer is an annular closed structure, including a plurality of groove reinforcement belts and fiber concrete. The plurality of groove reinforcement belts are respectively arranged in an arc along the circumferential direction of the waterproof and drainage protection layer. Anchor fittings are respectively installed at the springing of the plurality of groove reinforcement belts and are fixedly connected to the initial closed control layer. The groove reinforcement belt is rolled with a Q235 steel plate to form a groove, and a circumferential drain pipe is embedded in the groove.

[0010] The smooth closed layer is attached to the annular reinforcement layer and is integrally cast with high-performance concrete to form a smooth inner surface of the tunnel, which helps to improve the aesthetics and maintenance of the tunnel interior.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] By setting the initial closed control layer, the present utility model can quickly and effectively control the deformation of the surrounding rock of the soft rock tunnel and improve the adaptability of the support structure to the change of the surrounding rock. By setting the waterproof and drainage protection layer, the problem of easy water seepage at the joints of the waterproof board is effectively solved. The design of the full-ring closed structure of the annular reinforcement layer improves the overall stability of the support structure. The smooth closed layer not only improves the overall appearance but also simplifies the construction process and improves the construction efficiency. Description of the Drawings

[0013] Figure 1 It is a schematic cross-sectional view of the structure of a multi-layer fiber concrete arch reinforcement structure for a soft rock tunnel of the present utility model;

[0014] Figure 2 It is a schematic longitudinal-sectional view of the structure of a multi-layer fiber concrete arch reinforcement structure for a soft rock tunnel of the present utility model;

[0015] Figure 3 It is a schematic view of the structure of the waterproof and drainage protection layer of the present utility model;

[0016] In the figure: 1. Initial closed control layer; 2. Waterproof and drainage protection layer; 3. Annular reinforcement layer; 4. Smooth closed layer; 201. Waterproof sealing layer; 202. Drainage pipe network layer; 301. Groove reinforcement belt; 302. Fiber concrete; 303. Anchor fitting; 5. Circumferential drain pipe; 6. Longitudinal drain pipe; 7. Transverse drain pipe; 8. Polymer spray waterproof structure; 9. Geotextile; 10. Waterproof membrane. Detailed Embodiments

[0017] Combined with the accompanying drawings in the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0018] See Figures 1 to 3 , a multi-layer fiber concrete arch reinforcement structure for soft rock tunnels, including an initial closed control layer 1, a waterproof and drainage protection layer 2, a circular reinforcement layer 3, and a flat closed layer 4; the initial closed control layer 1, the waterproof and drainage protection layer 2, the circular reinforcement layer 3, and the flat closed layer 4 are sequentially stacked from the surrounding rock to the inside of the tunnel to form an arch structure.

[0019] In this embodiment, the material of the initial closed control layer 1 is fiber concrete; the waterproof and drainage protection layer 2 includes a waterproof sealing layer 201 and a drainage pipe network layer 202. Among them, a polymer spray waterproof structure 8 is provided above the arch feet of the tunnel; geotextiles 9 are provided at the arch feet and the arch bottom of the tunnel. The polymer spray waterproof structure 8 and the geotextiles 9 are connected by a waterproof membrane 10. The drainage pipe network layer 202 includes a circumferential drainage pipe 5, a longitudinal drainage pipe 6, and a transverse drainage pipe 7. The circumferential drainage pipe 5 is arranged in a ring along the tunnel body. The spacing of the circumferential drainage pipes 5 is determined according to hydraulic calculations. The longitudinal drainage pipe 6 is arranged along the extension direction of the tunnel. The transverse drainage pipe 7 is arranged at the arch bottom of the tunnel. The water in the circumferential drainage pipe 5 and the longitudinal drainage pipe 6 flows into the arch foot central water channel through the transverse drainage pipe 7 and is finally discharged from the structure; the circular reinforcement layer 3 is a circular closed structure, including a plurality of groove reinforcement belts 301 and fiber concrete 302. The plurality of groove reinforcement belts 301 are arranged in an arc along the circumference of the waterproof and drainage protection layer. The circumferential drainage pipe 5 is embedded in the groove. The circumferential ends of the groove reinforcement belts 301 are respectively fixedly connected to the initial closed control layer 1 through anchor bolts 303; finally, a flat closed layer 4 is constructed closely adjacent to the circular reinforcement layer 3, and the flat closed layer 4 is integrally poured with high-performance concrete.

[0020] The specific installation method of the present utility model is as follows:

[0021] 1. After the tunnel is excavated, first spray fiber concrete on the surrounding rock surface of the tunnel body to form the initial closed control layer 1 to realize the initial support of the tunnel;

[0022] 2. After the initial closed control layer 1 reaches a certain design strength, construct the waterproof and drainage protection layer 2. Spray polymer spray film waterproof coating on the upper part of the tunnel arch feet to form the polymer spray waterproof structure 8. Lay geotextiles 9 at the arch feet and the arch bottom of the tunnel to jointly form the waterproof sealing layer 201; the circumferential drainage pipe 5, the longitudinal drainage pipe 6, and the transverse drainage pipe 7 jointly form the drainage pipe network layer 202; the waterproof sealing layer 201 and the drainage pipe network layer 202 are connected by a waterproof membrane 10;

[0023] 3. Lay the groove reinforcement belt 301 longitudinally and evenly along the tunnel body, and apply fiber concrete 302 to form the annular reinforcement layer 3. The groove reinforcement belt 301 penetrates into the initial closed control layer 1 through the anchor 303 at the arch foot for anchoring, further improving the stability of the tunnel support of the present utility model;

[0024] 4. Finally, pour high-performance concrete integrally as the flat closing layer 4 to further improve the reinforcement and waterproof drainage effects of the present utility model on the tunnel.

[0025] Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present utility model.

Claims

1. A multi-layer fiber concrete arch reinforcement structure for soft rock tunnels, characterized in that: It includes an initial closing control layer (1), a waterproof and drainage protection layer (2), a circular reinforcement layer (3) and a flat closing layer (4). The initial closing control layer (1), the waterproof and drainage protection layer (2), the circular reinforcement layer (3) and the flat closing layer (4) are sequentially stacked from the surrounding rock towards the tunnel interior to form an arch structure; the waterproof and drainage protection layer (2) includes a waterproof sealing layer (201) and a drainage pipe network layer (202); the circular reinforcement layer includes a plurality of groove reinforcement belts (301), fiber concrete (302) and anchor bolts (303).

2. The multi-layer fiber concrete arch reinforcement structure for soft rock tunnels according to claim 1, wherein: The material of the initial closing control layer (1) is fiber concrete, and the fiber material can be polypropylene fiber, steel fiber or basalt fiber, which can be reasonably selected according to the on-site construction requirements.

3. A multi-layer fiber concrete arch reinforcement structure for soft rock tunnels according to claim 1, characterized in that: The waterproof sealing layer (201) in the waterproof and drainage protection layer (2) includes a polymer spray waterproof structure (8) on the tunnel vault and geotextiles (9) at the tunnel springing and the tunnel invert; the drainage pipe network layer (202) includes a circumferential drain pipe (5), a longitudinal drain pipe (6) and a transverse drain pipe (7); the waterproof sealing layer (201) and the drainage pipe network layer (202) are connected by a waterproof membrane (10).

4. A multi-layer fiber concrete arch reinforcement structure for soft rock tunnels according to claim 1, characterized in that: The groove reinforcement belts (301) in the circular reinforcement layer (3) are respectively arranged in a circumferential arc along the waterproof and drainage protection layer (2), and are respectively connected to the anchor bolts (303) at the springing. The circumferential drain pipe (5) is embedded in the groove, and the anchor bolts (303) penetrate into the initial closing control layer (1) and are fastened.

5. A multi-layer fiber concrete arch reinforcement structure for soft rock tunnels according to claim 1, characterized in that: The flat closing layer (4) is attached to the circular reinforcement layer (3), and is integrally poured with high-performance concrete to form a smooth inner surface of the tunnel.

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