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Construction method for tunnel double adit roof ripping

A construction method and technology for tunnels, which are applied in tunnels, tunnel linings, and earth-moving drilling and mining, etc., can solve problems such as high safety risks, complex stress, and easy deformation, achieve easy support, optimize stress structures, and speed up construction progress. Effect

Active Publication Date: 2017-02-22
NO 4 ENG CO LTD OF CHINA RAILWAY 11 BUREAU GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a tunnel for the existing problems such as complex stress, difficult support, easy deformation, and high safety risk in the single-branch tunnel roofing construction in the soft surrounding rock geology and super-large-section tunnel excavation construction. Double-branch tunnel roof construction method

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  • Construction method for tunnel double adit roof ripping
  • Construction method for tunnel double adit roof ripping
  • Construction method for tunnel double adit roof ripping

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Embodiment Construction

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] see Figure 1 to Figure 4 The invention relates to a construction method for overhanging a double-branch tunnel of a tunnel, which is a large-section excavation construction method for a weak surrounding rock of a tunnel, and is mainly a construction method for overhanging a double-branch tunnel for a large-section tunnel; comprising the following steps:

[0031] Step one, construction preparation.

[0032] Step 2: On the basis of the parallel guide tunnel 1, excavate and support the upper branch tunnel 2 and the lower branch tunnel 3 by staggering back and forth, so that the climbing slope of the upper branch tunnel 2 intersects vertically with the upper part of the main tunnel 4, and the lower branch tunnel 3 has a flat slope. Intersect vertically with the bottom of Zhengdong 4.

[0033] Step 3: Set up a door-shaped steel f...

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Abstract

The invention discloses a construction method for tunnel double adit roof ripping. The construction method for the tunnel double adit roof ripping comprises the following steps that construction is prepared, specifically, the excavation and support of an upper adit (2) and a lower adit (3) is conducted in a staggered mode, a door-shaped steel frame is erected on the intersection port of the lower adit (3) and a positive cave (4), and the upper adit (2) enters the upper portion of the positive cave (4) in a roof ripping mode; a preliminary-stage support steel frame on the upper portion of the positive cave (4) is erected, concrete is sprayed to conduct sealing, and backfill is conducted on the portion between the roof ripping top of the upper adit (2) and the preliminary-stage support steel frame on the upper portion of the positive cave (4); a shape steel frame of the positive cave (4) is erected, an anchor rod is struck to conduct locking, concrete is sprayed to conduct sealing, and the lower adit (3) enters the lower portion of the positive cave (4); the positive cave (4) is excavated from the upper portion to the portion where the lower adit (3) penetrates through the positive cave (4), a circumferential direction steel frame support is formed, and the construction of large section weak surrounding rocks is finished. The collapse risk of a large section tunnel in a weak surrounding rock geological section is lowered.

Description

technical field [0001] The invention relates to a tunnel construction method, and more specifically relates to a method for overhanging a double-branched roof of a large-span tunnel with soft surrounding rock, belonging to the technical field of tunnel construction. Background technique [0002] In the tunnel construction, the general tunnel cross-section roof adopts a single-hole roof. However, when the geology of the surrounding rock is weak and the cross-section is super large, the cross-section of the pilot tunnel is small and the cross-section of the main tunnel is large. Elevation; during the bottoming process, the bottom of the pilot tunnel is suspended in the air. While it is under stress, the external force borne by the initial support of the main tunnel will also be transmitted to the bottom of the parallel pilot tunnel wall. Therefore, its stress is complicated and the deformation of the surrounding rock increases. The structure of the pilot tunnel and the comple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/00E21D11/14
CPCE21D11/00E21D11/14
Inventor 王更峰刘素云张晓晓何磊熊晓晖王宁黄新宇
Owner NO 4 ENG CO LTD OF CHINA RAILWAY 11 BUREAU GRP
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