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Tunnel-entering structure and tunnel-entering construction method

A construction method and tunnel entry technology, applied in tunnels, tunnel linings, earthwork drilling, etc., can solve the problems of high tunnel entry construction risk, loose soil structure, easy disintegration and collapse, etc., achieving high strength and reducing disturbance. , to ensure the effect of stability

Pending Publication Date: 2019-03-29
中铁十局集团有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Traditional tunnel construction mostly adopts guide wall and advanced pipe shed support measures, mainly adopts the principle of tension-shear balance force, which has a strong dependence on the stability of the mountain itself, long period, high cost, and large disturbance
For loess tunnels, due to the loose soil structure, collapsibility, poor self-stabilization ability, and easy disintegration and collapse when encountering water and construction disturbances, the tunnel construction risk is extremely high when the tunnel is shallow buried and biased under complex geological conditions

Method used

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  • Tunnel-entering structure and tunnel-entering construction method

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with accompanying drawing by non-limiting embodiment:

[0020] As shown in the accompanying drawings, a tunnel entry structure includes an open-hole type protective arch, a small grouting conduit 4, and a spray anchor protection structure 5 for mountain slopes and uphill slopes. The guard arch includes a grid arch 3 on the inside, a steel arch 2 on the outside of the grid arch 3, two layers outside the steel arch 2 and inside the grid arch 3 The shotcrete layer 1, the grid arch 3 and the section steel arch 2 are all composed of several arches connected by longitudinal connecting bars. The small grouting conduit 4 has two layers, one layer of the small grouting conduit 4 is connected to the mountain body 7 at an extra angle of 10° to 15° from the belly of the steel arch 2 to the front, and its tail The end is welded and connected with the section steel arch 2, and the other layer of the small grouting ...

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Abstract

The invention discloses a tunnel-entering structure and a tunnel-entering construction method. The tunnel-entering structure comprises a protective arch, a grouting small guide pipe, a mountain slopeand a heading slope shotcrete anchorage protective structure, the protective arch comprises a grating arch rack located on the inner side, a profile steel arch rack located on the outer side of the grating arch rack and two shotcrete layers located on the exterior of the profile steel arch rack and inside the grating arch rack, the grating arch rack and the profile steel arch rack are separately formed by connecting multiple arch rack bodies through longitudinal connecting ribs, the grouting small guide pipe is divided into two layers, one layer of the grouting small guide pipe is connected with a mountain by the extrapolation angle of 10-15 degrees from the web of the profile steel arch rack to the front, the tail end of the layer is welded to the profile steel arch rack, the other layerof the grouting small guide pipe is connected with the mountain by the extrapolation angle of 10-15 degrees from the web of the grafting arch rack to the front, and the tail end of the other layer iswelded to the grating arch rack. The tunnel-entering structure can reduce disturbance on the mountain and construction risks, the protective arch and the mountain are connected into a whole to jointlyresist to loads, deformation is effectively controlled, and tunnel entering can be realized safely, efficiently and rapidly.

Description

technical field [0001] The invention relates to a tunnel entry structure, which is mainly used in loess tunnel entry construction and belongs to the technical field of tunnel construction. The present invention also relates to a tunnel entry construction method utilizing the above-mentioned tunnel entry structure. Background technique [0002] Traditional tunnel construction mostly adopts guide wall and advanced pipe shed support measures, mainly adopts the principle of tension-shear balance force, which is highly dependent on the stability of the mountain itself, with long period, high cost and large disturbance. For loess tunnels, due to the loose soil structure, collapsibility and poor self-stabilization ability, it is easy to disintegrate and collapse when encountering water and construction disturbances. The tunnel construction risk is extremely high when the tunnel is buried shallowly and under complex geological conditions under partial pressure. Contents of the inv...

Claims

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Application Information

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IPC IPC(8): E21D9/14E21D11/00E21D11/10
CPCE21D9/14E21D11/00E21D11/10
Inventor 常春章华敬华杨保全张海霞曾来仕杨成达赵坤殷倩倩
Owner 中铁十局集团有限公司
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