Construction structure and technology of small clear distance tunnels

Abstract

The invention provides a construction structure and technology of small clear distance tunnels. The construction structure of small clear distance tunnels comprises a first hole and a posterior hole which are arranged in juxtaposition; the first hole comprises a first hole tunnel face and a first hole second lining end; the first hole tunnel face is arranged at one end of the first hole; the first hole second lining end is arranged at the relative inner side of the first hole; the posterior hole comprises a posterior hole tunnel face and a posterior hole second lining end; the posterior hole tunnel face is arranged at one end of the posterior hole; the posterior hole second lining end is arranged at the relative inner side of the posterior hole; the posterior hole tunnel face is arranged at a corresponding position between the first tunnel face and the first hole second lining end. The construction structure and technology of small clear distance tunnels is specially suitable for the geological situations of phyllite, soft, occurrence steep dip, the trend and route being intersected with small angle, rock stratum having thin layer sheet shape structure, joint developed and rock fragmentation.

Description

technical field [0001] The invention belongs to the field of construction engineering, and in particular relates to a small clear distance tunnel construction structure and its technology. Background technique [0002] my country is carrying out large-scale construction of transportation facilities, and tunnel projects with small clear distances emerge in endlessly. At home and abroad, fruitful research and practice work has been carried out on the construction of small-space tunnels, which has ensured the smooth completion of a large number of complex projects, and has also formed a relatively unified understanding and construction method; the shortcoming is that most construction technology achievements still focus on individual cases. It has reference significance for similar projects, but lacks systematic guiding significance. For certain small clear distance tunnel projects, the engineering disposal measures are also different. [0003] The current conventional mining ...

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Problems solved by technology

[0004] In order to solve the large impact of the existing mine blasting construction on the leading hole and the middle rock pillar, it is not suitable to adopt ordinary bolt grouting reinforcement measures, and the conventional safety step control is not suitable for the construction step distance and safety step of the left and right lines of the small clear distance tunnel. In view of the technical problem of distance control, the present invention provides a small clear distance tunnel construction structure and its technology that have little influence on the leading tunnel and the middle rock pillar, adapt to the strengthening measures, and are suitable for safe step distance control

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