Supporting system of water-rich drifting sand stratum full-weathering surrounding rock tunnel and construction method

Abstract

The invention discloses a supporting system of a water-rich drifting sand stratum full-weathering surrounding rock tunnel and a construction method. At least four layers of steps are arranged in a tunnel. Steel row frame supports are arranged between the steps and the top of the tunnel. An advanced small guide pipe and an advanced pipe shed are arranged at the top of the tunnel. A group of steel arch frames are arranged in the tunnel and are arranged at intervals in the longitudinal direction. The shapes of the steel arch frames are matched with the shape of the section of the tunnel. Pipe shed lock feet are arranged on the two sides of each layer of steps and on the steel arch frames respectively. Steel bar mesh pieces are laid and hung on the portions, between adjacent steel arch frames,of the inner lateral side of the tunnel. Concrete layers fully sprayed on the outer sides of the steel arch frames and the steel bar mesh pieces. Bar-shaped foundations are arranged on the positions,corresponding to the steel row frame supports, of the horizontal planes of the steps. Inclined supports are arranged between the steel row frame supports and the steel arch frames. The supporting system of the water-rich drifting sand stratum full-weathering surrounding rock tunnel and the construction method solve the technical problems that a traditional construction method easily causes settlement of an integral initial support structure, the construction space is small, steel frame arch foot pipe shed locking feet cannot be reinforced, the risk of median septum dismantling is large, the working procedures are complex and the construction speed is low.

Description

technical field [0001] The invention belongs to the technical field of underground engineering construction, in particular to a support system and a construction method for a fully weathered surrounding rock tunnel in a water-rich flowing sand stratum. Background technique [0002] Grade VI water-rich sand and stone surrounding rock, the surrounding rock is very poor, the conventional CRD construction method will cause the overall settlement of the overall primary support structure; and the CRD construction is divided into four small pilot tunnels for construction, the construction space is small, and it is impossible to carry out steelwork. The locking feet of the arched pipe shed are strengthened, the risk of demolition of the middle and next door is relatively high, the process is complicated, and the construction speed is slow. Contents of the invention [0003] The purpose of the present invention is to provide a support system and construction method for fully weathe...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a support system and construction method for fully weathered surrounding rock tunnels in water-rich flowing sand stratum. It is necessary to solve the problem that the traditional construction method is easy to cause the overall initial support structure to settle, the construction space is small, and it is impossible to carry out the steel frame arch foot pipe. The lock feet of the shed are strengthened, the risk is greater when removing the middle partition, the technical problems are complicated procedures and slow construction speed

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