A forked guide hole structure

Abstract

The utility model provides a bifurcated guide tunnel structure, belonging to the technical field of tunnel construction, including a branch tunnel and a main tunnel; a gradually expanding section is provided at one end of the branch tunnel, and the gradually expanding section bifurcates into a first bifurcated branch tunnel and a second bifurcated branch tunnel in a "bull nose" shape, so that the end of the first bifurcated branch tunnel is separated from the end of the second bifurcated branch tunnel. The utility model improves the intersection structure of the branch tunnel and the main tunnel, so that the end of the first bifurcated branch tunnel is separated from the end of the second bifurcated branch tunnel, so that during the construction process, the span of the intersection can be reduced, which is suitable for completing the construction of the intersection of the branch tunnel and the main tunnel in some areas with poor tunnel conditions.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel construction, in particular to a bifurcated guide tunnel structure. Background Art

[0002] At present, there are a large number of branch tunnel projects in tunnel construction. The existing construction method is mainly to enter the main tunnel in a bell-mouth manner. As a result, the intersection of the branch tunnel and the main tunnel often has large excavation spans, difficult initial support, and high construction safety risks. If the intersection of the branch tunnel and the main tunnel also has factors such as broken surrounding rock mass, large water inflow, high external water pressure, large intersection span, and poor tunnel conditions, the safety risks of tunnel collapse and water inrush at the intersection of the branch tunnel and the main tunnel will increase exponentially.

[0003] How to safely and smoothly complete the construction of the intersection of the branch tunnel and the main tunnel and smoothly enter the main tunnel for construction has become a problem to be solved by tunnel engineers. Utility Model Content

[0004] In order to solve the problem of completing the construction of the intersection of a branch tunnel and a main tunnel in areas with poor tunnel forming conditions, the utility model provides a bifurcated guide tunnel structure.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A bifurcated guide tunnel structure, comprising a branch tunnel and a main tunnel;

[0007] A gradual expansion section is provided at one end of the branch hole, and the gradual expansion section bifurcates into a first bifurcated branch hole and a second bifurcated branch hole in a "bull nose" shape, so that the end of the first bifurcated branch hole is separated from the end of the second bifurcated branch hole, the first bifurcated branch hole obliquely intersects with the main hole upstream of the main hole, and the second bifurcated branch hole obliquely intersects with the main hole downstream of the main hole;

[0008] A triangular area of ​​concrete is arranged inside the gradually expanding section and between the first bifurcated branch hole and the second bifurcated branch hole.

[0009] As a further description of the above technical solution:

[0010] The inner wall of the first bifurcated branch hole comprises: an initial support, a system anchor rod is arranged on the initial support, and a secondary support is arranged inside the initial support;

[0011] The ground of the first bifurcated branch hole comprises: bottom plate cushion layer concrete, and bottom plate concrete is arranged above the bottom plate cushion layer concrete.

[0012] As a further description of the above technical solution:

[0013] The bottom slab concrete is divided into wind, water and electricity areas, pedestrian areas and vehicle road areas.

[0014] A bifurcated guide tunnel structure, comprising a branch tunnel and a main tunnel, wherein a first bifurcated branch tunnel and a second bifurcated branch tunnel are arranged on the side of the branch tunnel, and a gap is arranged at the intersection of the first bifurcated branch tunnel and the second bifurcated branch tunnel, so that the end of the first bifurcated branch tunnel is separated from the end of the second bifurcated branch tunnel;

[0015] The first bifurcated branch hole obliquely intersects with the main hole upstream of the main hole, and the second bifurcated branch hole obliquely intersects with the main hole downstream of the main hole.

[0016] As a further description of the above technical solution:

[0017] The first bifurcated branch hole and the second bifurcated branch hole are both linear.

[0018] As a further description of the above technical solution:

[0019] The first bifurcated branch hole is arc-shaped, and the second bifurcated branch hole is linear.

[0020] Beneficial effects of the utility model:

[0021] The utility model improves the intersection structure of the branch tunnel and the main tunnel so that the end of the first bifurcated branch tunnel is separated from the end of the second bifurcated branch tunnel. In this way, the span of the intersection can be reduced during the construction process. The utility model is suitable for completing the construction of the intersection of the branch tunnel and the main tunnel in some areas with poor tunneling conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate a bifurcated guide tunnel structure, the following drawings are shown;

[0023] Figure 1 It is a plan view of the first embodiment of the utility model;

[0024] Figure 2 for Figure 1 A partial enlarged view of the middle part;

[0025] Figure 3 It is a cross-sectional view of the bifurcated branch hole of the utility model;

[0026] Figure 4 It is a cross-sectional schematic diagram of the starting point of the bifurcated branch hole of the utility model;

[0027] Figure 5 It is a schematic plan view of the triangular area concrete of the utility model;

[0028] Figure 6 It is a plan view of the second embodiment of the utility model;

[0029] Figure 7 This is a plan view of the second embodiment of the present utility model.

[0030] The reference numerals in the accompanying drawings:

[0031] 1. Branch tunnel; 2. Main tunnel; 201. Upstream of main tunnel; 202. Downstream of main tunnel; 3. First bifurcated branch tunnel; 301. Initial support; 302. System anchor rods; 303. Secondary support; 304. Carriageway area; 305. Bottom slab cushion concrete; 306. Bottom slab concrete; 307. Wind, water and electricity area; 308. Pedestrian walkway area; 4. Second bifurcated branch tunnel; 5. Gradual expansion section; 6. Triangle area concrete. DETAILED DESCRIPTION

[0032] Please refer to the attached Figure 1-Figure 5 , shows a forked guide hole structure provided in an embodiment of the present application, comprising a branch hole 1 and a main hole 2; a gradually expanding section 5 is provided at one end of the branch hole 1, and a first forked branch hole 3 and a second forked branch hole 4 are forked in a "bull nose" shape at the gradually expanding section 5, so that the end of the first forked branch hole 3 is separated from the end of the second forked branch hole 4.

[0033] Generally, the construction of the gradual expansion section 5 starts at a location about 30 meters away from the main tunnel on the branch tunnel 1, and then the construction of the first bifurcated branch tunnel 3 and the second bifurcated branch tunnel 4 is carried out.

[0034] The end of the first bifurcated branch tunnel 3 is separated from the end of the second bifurcated branch tunnel 4, so that the equipment can operate normally during the bifurcation construction, and the span at the intersection of the first bifurcated branch tunnel 3 and the second bifurcated branch tunnel 4 is smaller, which is conducive to tunnel formation and reduces the safety risks of tunnel collapse and water gushing at the intersection of the branch tunnel and the main tunnel.

[0035] The first bifurcated branch tunnel 3 obliquely intersects with the upstream 201 of the main tunnel 2 , and the second bifurcated branch tunnel 4 obliquely intersects with the downstream 202 of the main tunnel 2 .

[0036] A triangular area concrete 6 is provided inside the gradually expanding section 5 and between the first bifurcated branch hole 3 and the second bifurcated branch hole 4 . The triangular area concrete 6 is used to increase the support strength at the bifurcation of the first bifurcated branch hole 3 and the second bifurcated branch hole 4 .

[0037] For example, at a distance of 30m from the edge of the main tunnel, the upstream and downstream sides meet in a "bull nose" manner, and a pilot tunnel is excavated to enter the main tunnel. The excavation section of the pilot tunnel is appropriately reduced based on the excavation section of the branch tunnel (but the normal operation of subsequent construction vehicles in the tunnel must be guaranteed); in order to facilitate the stability of the reserved core rock wall, the axes of the upstream and downstream pilot tunnels are at an angle of 30° to the axes of the original branch tunnels.

[0038] In one embodiment, the inner wall of the first bifurcated branch hole 3 includes: an initial support 301 , a system anchor 302 is arranged on the initial support 301 , and a secondary support 303 is arranged on the inner side of the initial support 301 .

[0039] The ground of the first bifurcated branch hole 3 includes a bottom plate cushion layer concrete 305 , and a bottom plate concrete 306 is arranged above the bottom plate cushion layer concrete 305 .

[0040] The second bifurcated branch hole 4 has the same structure as the first bifurcated branch hole 3 .

[0041] The bottom slab concrete 306 is divided into a wind, water and electricity area 307, a pedestrian area 308 and a vehicle road area 304, which meet the subsequent construction transportation and overall construction layout requirements such as slag discharge, lining trolley entry, drainage water tank, construction ventilation, and construction electricity.

[0042] Embodiment 2

[0043] Please refer to the attached Figure 6 , Figure 7 , shows a forked guide hole structure provided in an embodiment of the present application, comprising a branch hole 1 and a main hole 2, a first forked branch hole 3 and a second forked branch hole 4 are arranged on the side of the branch hole 1, and a gap is arranged at the intersection of the first forked branch hole 3, the second forked branch hole 4 and the branch hole 1, so that the end of the first forked branch hole 3 is separated from the end of the second forked branch hole 4.

[0044] The first bifurcated branch tunnel 3 obliquely intersects with the upstream 201 of the main tunnel 2 , and the second bifurcated branch tunnel 4 obliquely intersects with the downstream 202 of the main tunnel 2 .

[0045] The end of the first bifurcated branch tunnel 3 is separated from the end of the second bifurcated branch tunnel 4, so that the equipment can operate normally during the bifurcation construction, and the span at the intersection of the first bifurcated branch tunnel 3 and the second bifurcated branch tunnel 4 is smaller, which is conducive to tunnel formation and reduces the safety risks of tunnel collapse and water gushing at the intersection of the branch tunnel and the main tunnel.

[0046] Please refer to the attached Figure 6 As shown, the first bifurcated branch hole 3 and the second bifurcated branch hole 4 are both linear.

[0047] Please refer to the attached Figure 7 As shown, the first bifurcated branch hole 3 is arc-shaped, and the second bifurcated branch hole 4 is linear.

[0048] Those skilled in the art will readily come up with other embodiments of the present invention after considering the specification and practicing the disclosure of the present invention. This application is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art that are not disclosed in the present invention. The specification and examples are to be considered as exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0049] It should be understood that relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The utility model is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the utility model is limited only by the appended claims.

Claims

1. A bifurcated guide tunnel structure, comprising a branch tunnel (1) and a main tunnel (2), characterized in that: A gradually expanding section (5) is provided at one end of the branch hole (1), and a first forked branch hole (3) and a second forked branch hole (4) are bifurcated in a "bull nose" shape at the gradually expanding section (5), so that the end of the first forked branch hole (3) is separated from the end of the second forked branch hole (4), the first forked branch hole (3) obliquely intersects with the upstream (201) of the main hole (2), and the second forked branch hole (4) obliquely intersects with the downstream (202) of the main hole (2); A triangular area concrete (6) is provided inside the gradually expanding section (5) and between the first bifurcated branch hole (3) and the second bifurcated branch hole (4).

2. A bifurcated guide hole structure according to claim 1, characterized in that: The inner wall of the first bifurcated branch hole (3) comprises: an initial support (301), a system anchor rod (302) is arranged on the initial support (301), and a secondary support (303) is arranged inside the initial support (301); The ground surface of the first bifurcated branch hole (3) comprises: a bottom plate cushion layer concrete (305), and a bottom plate concrete (306) is arranged above the bottom plate cushion layer concrete (305).

3. A bifurcated guide hole structure according to claim 2, characterized in that: The bottom slab concrete (306) is divided into a wind, water and electricity area (307), a pedestrian area (308) and a vehicle road area (304).

4. A bifurcated guide tunnel structure, comprising a branch tunnel (1) and a main tunnel (2), characterized in that: A first bifurcated branch hole (3) and a second bifurcated branch hole (4) are arranged on the side of the branch hole (1); a gap is arranged at the intersection of the first bifurcated branch hole (3), the second bifurcated branch hole (4) and the branch hole (1), so that the end of the first bifurcated branch hole (3) is separated from the end of the second bifurcated branch hole (4); The first bifurcated branch hole (3) obliquely intersects with the upstream (201) of the main hole of the main hole (2), and the second bifurcated branch hole (4) obliquely intersects with the downstream (202) of the main hole of the main hole (2).

5. A bifurcated guide hole structure according to claim 4, characterized in that: The first bifurcated branch hole (3) and the second bifurcated branch hole (4) are both linear.

6. A bifurcated guide hole structure according to claim 4, characterized in that: The first bifurcated branch hole (3) is arc-shaped, and the second bifurcated branch hole (4) is linear.

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