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Three-wire parallel small spacing large section tunnel group construction method

A construction method and small-spacing technology, applied in tunnels, tunnel linings, earth-moving drilling, etc., can solve problems such as rock column instability, affecting the smooth progress of construction, safety accidents, etc. The effect of digging through safely

Inactive Publication Date: 2015-07-01
CHINA RAILWAY NO 9 GRP
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Problems solved by technology

During the excavation and construction of small-space multi-hole tunnels, due to the deflection of the rock mass caused by blasting vibration, partial or overall instability and collapse of the rock pillars in the middle of the tunnel will be caused, which not only affects the smooth progress of the construction, but also increases the difficulty of the support construction , engineering costs increase, and even cause safety accidents

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  • Three-wire parallel small spacing large section tunnel group construction method

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Embodiment Construction

[0021] The construction method of the three-line parallel small-space large-section tunnel group includes the following steps:

[0022] 1) Advance geological forecast: Firstly carry out regional geological forecast to form a macroscopic judgment on the condition of the rock mass in the strata where the tunnel is located, then conduct a geological sketch to reasonably infer the surrounding rock within 5m, and with the advancement of the tunnel face, open the Excavate the structure and structure data of the rock mass to improve, and finally carry out drilling sampling and prediction to determine the lithology and structural characteristics of the rock mass;

[0023] 2) Advance pre-reinforcement of the main tunnel:

[0024] 2a) Pre-reinforcement of the large pipe shed at the tunnel entrance: the pre-reinforcement of the large pipe shed is carried out at the shallow buried section of the main tunnel entrance and exit, and the φ108×5mm hot-rolled seamless steel pipe is installed wi...

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Abstract

The invention relates to a three-wire parallel small spacing large section tunnel group construction method. The three-wire parallel small spacing large section tunnel group construction method includes the steps that advance geology forecast is conducted; tunnel entrance large pipe shed pre-reinforcement is conducted; advanced pre-reinforcement is conducted on two sides of a tunnel; blasting is controlled; preliminary supporting is conducted; secondary lining is constructed; monitoring and measurement are conducted. A new austrian tunneling method is adapted, destabilization on surrounding rocks is reduced, the strength of the surrounding rocks is not damaged, an uniform structural system is formed by the surrounding rocks and all kinds of structural supports, grouting advanced pre-reinforcement measure is conducted by using a large pipe shed, a middle pipe shed and small guide pipes, grouting reinforcement is conducted on tunnel faces and middle rock pillars, the preliminary supporting is timely, the temporary supporting is reasonable, the stability of the surrounding rocks of the tunnel is guaranteed, the construction is safe and reliable, the outline of the fracture surface is formed and structured by using elementary error smooth blasting, the lining construction is facilitated, the construction quality is guaranteed, the work amount of over-excavation and under-excavation is reduced, the construction progress is kept, the construction cost is lowered, and the economic benefit is remarkable.

Description

technical field [0001] The invention relates to a tunnel construction method, in particular to a three-line parallel tunnel group construction method with small spacing and large section. Background technique [0002] When the newly-built passenger dedicated line passes through the mountains, limited by the terrain and the curve of the passenger dedicated line, tunnels with small spacing and multiple holes appear many times. During the excavation and construction of small-space multi-hole tunnels, due to the deflection of the rock mass caused by blasting vibration, partial or overall instability and collapse of the rock pillars in the middle of the tunnel will be caused, which not only affects the smooth progress of the construction, but also increases the difficulty of the support construction , engineering costs increase, and even cause safety accidents. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a constr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/10E21D11/00F42D3/04
CPCE21D9/00E21D9/001E21D9/006E21D11/00E21D11/10E21D11/14F42D3/04
Inventor 陈海军赵金祥金毓红金龙韩顺学许庆君王录林张明武丁宁唐贞锋铁大禹隋成文
Owner CHINA RAILWAY NO 9 GRP
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