Construction method of V-level surrounding rock tunnel

Abstract

The invention relates to a construction method of a V-level surrounding rock tunnel, comprising the following steps: (1) making a drill guiding I-beam steel lagging jack, i.e. mounting an I-beam steel lagging jack, a groove steel trimming beam, a lock pin anchor rod, a guiding steel pipe, a longitudinal connection steel rib and face injecting concrete in sequence; and (2) construction and support in the tunnel, i.e. drilling pipe shelter steel pipe holes, mounting pipe shelter steel pipes, filling slurry inwards. The earthwork construction of a pilot tunnel comprises earthwork construction, primary support, injecting concrete on a pilot tunnel wall, suspending steel bar nets, casting concrete basis, mounting I-beam steel lagging jack, groove steel trimming beam, steel pads, I-shaped steel inclined strut and lock pin anchor rods, welding longitudinal connection steel bar, injecting concrete on the face and removing core soils; mounting a first-level step temporary inverted arch comprises: constructing lower-level earthwork, performing primary support in the pivot tunnel, mounting the second-level step temporary inverted arch, constructing the following level of earthwork, performing primary support, casting and filling inverted arch, and casting lining concrete at a time inside the pivot tunnel. The invention has the advantage of rapid penetration speed and safe construction.

Description

Technical field: [0001] The invention creates a method related to the construction of V-level and V-level weak surrounding rock tunnels. Background technique: [0002] In the past, when constructing V-level and V-level weak surrounding rock tunnels, the double-side-wall pilot pit method was adopted. This method made the end of the leading small conduit in an unfavorable cantilever state, which easily formed a landslide, causing the upper part of the pilot pit to collapse. It is not conducive to the function of small conduits, the construction footage is slow, the construction efficiency is low, and it is not conducive to passing through weak surrounding rock areas. Invention content: [0003] The purpose of the present invention is to provide a construction method for V-level surrounding rock tunnels with fast footage, safe construction, reasonable stress on the support structure, and a V-level surrounding rock tunnel that can pass through weak surrounding rock sections; t...

AI Technical Summary

Problems solved by technology

[0002] In the past, when constructing V-level and V-level weak surrounding rock tunnels, the double-side-wall pilot pit method was adopted. This method made the end of the leading small conduit in an unfavorable cantilever state, which easily formed a landslide, causing the upper part of the pilot pit to collapse. It is not conducive to the function of small conduits, the construction footage is slow, the construction efficiency is low, and it is not conducive to passing through weak surrounding rock areas

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