Tunnel yielding supporting structure

Abstract

The utility model belongs to the technical field of tunnel supporting, and particularly relates to a tunnel yielding supporting structure which comprises a first supporting frame, a second supporting frame, yielding units, a steel fiber reinforced concrete layer and connecting bolts. The gap between the first supporting frame and the second supporting frame is filled with sprayed steel fiber concrete to form a steel fiber concrete layer. According to the supporting structure, the lining structure with the sprayed steel fiber reinforced concrete and the yielding units is adopted, the flexibility of the lining structure is achieved through the yielding units, the rigidity of the structure is achieved through the sprayed steel fiber reinforced concrete, and the supporting structure and system with good deformation capacity are formed to meet the supporting requirement of yielding deformation; the surrounding rock continuously deforms under the limitation of the supporting structure, so that the deformation energy stored in the surrounding rock can be continuously and gradually released, and the surrounding rock pressure acting on the supporting structure is effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel support, and in particular relates to a tunnel pressure-yielding support structure. Background Art

[0002] With the country's investment and promotion of infrastructure construction, my country's transportation construction has developed rapidly, especially tunnel construction has made great progress. In tunnel construction projects, the initial support type of the tunnel has a very important impact on its structural stability.

[0003] At present, although the existing tunnel support structure has a strong bearing capacity, it cannot release stress well. Its limited deformation capacity cannot cope with the larger deformation that may occur in the support structure, which can easily cause cracking and deformation of the lining or even instability and damage. Cracks are prone to occur, posing a greater safety hazard.

[0004] Based on this, the utility model designs a tunnel pressure-yielding support structure to solve the above problems. Utility Model Content

[0005] The utility model aims to solve the shortcomings in the prior art and proposes a tunnel pressure-yielding support structure.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a tunnel pressure-yielding support structure, comprising a first support frame, a second support frame, a pressure-yielding unit, a steel fiber concrete layer and connecting bolts, wherein the two first support frames and the second support frames form an annular arch structure, and the connection between the two first support frames and the second support frames is provided with a pressure-yielding unit, and the upper and lower ends of the pressure-yielding unit are respectively fixedly connected to the first support frame and the second support frame by a plurality of connecting bolts.

[0007] As a preferred technical solution of the utility model, the interior of the gap between the first supporting frame and the second supporting frame is filled with sprayed steel fiber concrete to form a steel fiber concrete layer, and the steel fiber concrete layer is flush with the arch frame.

[0008] As a preferred technical solution of the utility model, the first supporting frame includes a first arc-shaped steel plate, a first connecting steel plate, a first mounting hole and a first I-shaped steel. A first connecting steel plate is welded between the upper and lower ends of two of the first arc-shaped steel plates, and the first connecting steel plates are each provided with five first mounting holes. A plurality of first I-shaped steels are welded between the two first arc-shaped steel plates.

[0009] As a preferred technical solution of the present utility model, the second supporting frame includes a second arc-shaped steel plate, a second connecting steel plate, a second mounting hole and a second I-shaped steel. A second connecting steel plate is welded between the upper and lower ends of the two second arc-shaped steel plates and the second connecting steel plates are each provided with five second mounting holes. A plurality of second I-shaped steels are welded between the two second arc-shaped steel plates.

[0010] As a preferred technical solution of the utility model, the pressure-releasing unit includes a first pressure-releasing seat, a second pressure-releasing seat, a screw hole and a screw hole, and the pressure-releasing tube is fixedly connected between the first pressure-releasing seat and the second pressure-releasing seat, and five screw holes are provided on the outer sides of the first pressure-releasing seat and the second pressure-releasing seat.

[0011] As a preferred technical solution of the utility model, the five screw holes provided on the first pressure-releasing seat and the second pressure-releasing seat respectively correspond to the five first mounting holes on the first supporting frame and the five second mounting holes on the second supporting frame.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The support structure of the utility model adopts a lining structure of sprayed steel fiber concrete plus a pressure-yielding unit. The flexibility of the lining structure is achieved by the pressure-yielding unit, and the rigidity of the structure is achieved by spraying steel fiber concrete, forming a support structure and system with good deformation capacity to meet the support requirements of pressure-yielding deformation, so that the surrounding rock can continue to deform under the restriction of the support structure, so that the deformation energy stored in the surrounding rock can be continuously and gradually released, and the surrounding rock pressure acting on the support structure can be effectively reduced;

[0014] 2. The utility model is provided with a first support frame and a second support frame. The first support frame and the second support frame work together with the sprayed steel fiber concrete to further improve the bearing capacity and stability of the support structure, while ensuring the strength and rigidity of the initial support of the lining, thereby facilitating the smooth progress of the construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 It is a schematic diagram of the overall front view structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the utility model;

[0018] Figure 3 It is a schematic diagram of the support frame structure of the utility model;

[0019] Figure 4 It is a partial enlarged structural schematic diagram of the utility model;

[0020] Figure 5 This is a schematic diagram of the first support frame structure of the utility model;

[0021] Figure 6 It is a schematic diagram of the structure of the second support frame of the utility model;

[0022] Figure 7 It is a schematic diagram of the structure of the pressure-yielding unit of the utility model.

[0023] In the figure: 1. first supporting frame; 101. first arc-shaped steel plate; 102. first connecting steel plate; 103. first mounting hole; 104. first I-shaped steel; 2. second supporting frame; 201. second arc-shaped steel plate; 202. second connecting steel plate; 203. second mounting hole; 204. second I-shaped steel; 3. pressure-relieving unit; 301. first pressure-relieving seat; 302. second pressure-relieving seat; 303. pressure-relieving pipe; 304. screw hole; 4. steel fiber concrete layer; 5. connecting bolts. DETAILED DESCRIPTION

[0024] The following will be combined with the attached embodiment of the utility model Figure 1-7 , clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 The utility model provides the following technical solutions: a tunnel pressure-yielding support structure, comprising a first support frame 1, a second support frame 2, a pressure-yielding unit 3, a steel fiber concrete layer 4 and a connecting bolt 5, the two first support frames 1 and the second support frame 2 form an annular arch structure, and the pressure-yielding unit 3 is provided at the connection between the two first support frames 1 and the second support frame 2, and the upper and lower ends of the pressure-yielding unit 3 are respectively fixedly connected to the first support frame 1 and the second support frame 2 by a plurality of connecting bolts 5.

[0026] The interior of the gap between the first supporting frame 1 and the second supporting frame 2 is filled with sprayed steel fiber concrete to form a steel fiber concrete layer 4, and the steel fiber concrete layer 4 is flush with the arch frame.

[0027] The above structure forms a lining structure of sprayed steel fiber concrete and pressure-yielding units. Through combined use, the support principle of first flexible and then rigid, and a combination of rigidity and flexibility is realized, so that the support structure meets the support requirements of pressure-yielding deformation.

[0028] Please refer to Figure 3 , Figure 5 , Figure 6 and Figure 7 The first support frame 1 includes a first arc-shaped steel plate 101, a first connecting steel plate 102, a first mounting hole 103 and a first I-shaped steel 104. The first connecting steel plate 102 is welded between the upper and lower ends of the two first arc-shaped steel plates 101, and the first connecting steel plates 102 are each provided with five first mounting holes 103. A plurality of first I-shaped steels 104 are welded between the two first arc-shaped steel plates 101.

[0029] The second supporting frame 2 includes a second arc-shaped steel plate 201, a second connecting steel plate 202, second mounting holes 203 and a second I-shaped steel 204. A second connecting steel plate 202 is welded between the upper and lower ends of the two second arc-shaped steel plates 201, and the second connecting steel plates 202 are each provided with five second mounting holes 203. A plurality of second I-shaped steels 204 are welded between the two second arc-shaped steel plates 201.

[0030] The pressure release unit 3 comprises a first pressure release seat 301 , a second pressure release seat 302 , screw holes 304 and screw holes 304 , and the pressure release tube 303 is fixedly connected between the first pressure release seat 301 and the second pressure release seat 302 . Five screw holes 304 are provided on the outer sides of the first pressure release seat 301 and the second pressure release seat 302 .

[0031] The five screw holes 304 formed on the first pressure-releasing seat 301 and the second pressure-releasing seat 302 correspond to the five first mounting holes 103 on the first supporting frame 1 and the five second mounting holes 203 on the second supporting frame 2 , respectively.

[0032] By providing the pressure relief unit 3 at the connection between the first support frame 1 and the second support frame 2, the support structure formed after the spraying of steel fiber concrete has a good deformation capacity, thereby effectively reducing the surrounding rock pressure acting on the support structure, and allowing the deformation energy stored in the surrounding rock to be continuously and gradually released.

[0033] The working principle and use process of the utility model are as follows: the steel structure components required for the support structure are transported into the tunnel, and then two first support frames 1, two second support frames 2 and four pressure-relieving units 3 are spliced ​​and assembled in the tunnel through connecting bolts 5 to form an annular lining arch frame, and then concrete mixed with steel fibers is sprayed into the assembled bracket to form a lining steel fiber concrete layer 4, thereby forming a support structure of sprayed steel fiber concrete plus pressure-relieving units. Under the action of the pressure-relieving units 3, the support structure has better deformation ability, so that the deformation energy stored in the surrounding rock can be continuously and gradually released, effectively reducing the surrounding rock pressure acting on the support structure, and ensuring that this deformation process is always in a controllable state and the surrounding rock does not undergo excessive relaxation and deformation.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A tunnel pressure relief support structure, comprising a first support frame (1), a second support frame (2), a pressure relief unit (3), a steel fiber concrete layer (4) and connecting bolts (5), characterized in that: The two first support frames (1) and the second support frame (2) form an annular arch structure, and the connection between the two first support frames (1) and the second support frame (2) is provided with a pressure-releasing unit (3), and the upper and lower ends of the pressure-releasing unit (3) are respectively fixedly connected to the first support frame (1) and the second support frame (2) by a plurality of connecting bolts (5).

2. A tunnel pressure-yielding support structure according to claim 1, characterized in that: The interior of the gap between the first support frame (1) and the second support frame (2) is filled with sprayed steel fiber concrete to form a steel fiber concrete layer (4), and the steel fiber concrete layer (4) is flush with the arch frame.

3. A tunnel pressure-yielding support structure according to claim 1, characterized in that: The first support frame (1) comprises a first arc-shaped steel plate (101), a first connecting steel plate (102), a first mounting hole (103) and a first I-shaped steel (104); a first connecting steel plate (102) is welded between the upper and lower ends of the two first arc-shaped steel plates (101), and the first connecting steel plates (102) are each provided with five first mounting holes (103); and a plurality of first I-shaped steels (104) are welded between the two first arc-shaped steel plates (101).

4. The tunnel pressure-yielding support structure according to claim 1, characterized in that: The second support frame (2) comprises a second arc-shaped steel plate (201), a second connecting steel plate (202), a second mounting hole (203) and a second I-shaped steel (204); a second connecting steel plate (202) is welded between the upper and lower ends of the two second arc-shaped steel plates (201), and the second connecting steel plates (202) are each provided with five second mounting holes (203); and a plurality of second I-shaped steels (204) are welded between the two second arc-shaped steel plates (201).

5. The tunnel pressure-yielding support structure according to claim 1, characterized in that: The pressure-releasing unit (3) comprises a first pressure-releasing seat (301), a second pressure-releasing seat (302), a screw hole (304) and a screw hole (304); a pressure-releasing tube (303) is fixedly connected between the first pressure-releasing seat (301) and the second pressure-releasing seat (302); and five screw holes (304) are provided on the outer sides of the first pressure-releasing seat (301) and the second pressure-releasing seat (302).

6. A tunnel pressure-yielding support structure according to claim 5, characterized in that: The five screw holes (304) formed on the first pressure-releasing seat (301) and the second pressure-releasing seat (302) respectively correspond to the five first mounting holes (103) on the first supporting frame (1) and the five second mounting holes (203) on the second supporting frame (2).

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