Method for quickening construction of multiple-arch tunnel

Abstract

The invention relates to a method for quickening construction of a multiple-arch tunnel. The method includes: firstly, pre-supporting a middle pilot tunnel; and secondly, excavating the middle pilot tunnel, constructing a left main tunnel, a right main tunnel, and a cover arch and a long pipe roof of the middle pilot tunnel, setting a widened segment allowing a loader to turn around in the middle of the middle pilot tunnel, and after the middle pilot tunnel is through, constructing a middle partition wall from an entrance of the middle pilot tunnel to an exit of the middle pilot tunnel. The method has the advantages that construction entering is assisted by advanced small pilot pipes so that entering construction period of the middle pilot tunnel is reduced; the section of the middle pilot tunnel is locally enlarged, the loader is used with a dumper for construction, and accordingly residue discharging efficiency is improved greatly; the construction method of the middle partition wall is modified, so that the main tunnels can be constructed in advance; and the middle partition wall and the main tunnels are constructed in parallel, time and space are more reasonable, and accordingly personnel idleness and machine idleness are avoided and construction speed is increased.

Description

technical field [0001] The invention relates to the technical field of road and bridge construction, in particular to a method for accelerating the construction speed of a multi-arch tunnel. Background technique [0002] With the strengthening of the concept and awareness of environmental protection, the proportion of tunnels in expressway projects is getting higher and higher. The construction of multi-arch tunnel is relatively safe, the structure is beautiful, and compared with the separate tunnel under the same geological conditions, it has the advantages of less land occupation, smooth plane alignment, and less environmental damage. Multi-arch tunnel is particularly important in nature reserves. The construction section of the pilot tunnel in the multi-arch tunnel is small, and multiple machines cannot be selected to work at the same time, which seriously affects the construction progress. The traditional construction method of the multi-arch tunnel is that the central ...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is: in the traditional construction method of multi-arch tunnel, the auxiliary construction of entering the tunnel is complicated and delays the time of the entry construction of the intermediate pilot tunnel, the slag discharge efficiency is low in the construction of the intermediate pilot tunnel, and The construction of the main tunnels on both sides is delayed due to the long duration of all partition walls, providing a method for accelerating the construction speed of multi-arch tunnels by entering the central pilot tunnel in advance, improving the efficiency of slag discharge, and parallel construction of the central partition wall and the main tunnel

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