Rapid construction method for long and large double-multiple arch tunnel

Abstract

The invention discloses a rapid construction method for a long and large double-multiple arch tunnel. The tunnel is equally divided into 2n sections according to the length along the longitudinal direction; 0-n section of tunnel construction is used for illustration; n-2n section of tunnel construction and 0-n section of tunnel construction are symmetrically carried out at the same time. The method comprises the steps: step (1), 0-1 section is constructed in a hole, a mid-guiding hole is firstly excavated and supported, and a left side wall guiding hole and a right side wall guiding hole are excavated and supported in a way of lagging the mid-guiding hole for a certain safe distance; and step (2)-step (5), construction passages are alternately converted to continue carrying out a next period of construction; the phenomenon that mutual interference happens to construction of a middle wall, the left side wall guiding hole, the right side wall guiding hole, the mid-guiding hole, a left main hole and a right main hole; the middle wall at a (n-1)st contact channel is constructed after the construction of n-2 section-n-1 section of left main hole and n-1 section-n section of middle wall is completed; afterwards, the construction passages are converted again; and the left main hole and the right main hole are respectively used as respective construction passages to complete the construction of the rest n-1 section-n section of left main hole and right main hole.

Description

Technical field [0001] The invention relates to the field of tunnel construction, and is particularly suitable for a double-arch construction method. Background technique [0002] In recent years, double-arch tunnels have gradually been favored by people due to their advantages of easy wiring, less land occupation, and environmental protection. In view of different geological conditions, the traditional double-arch tunnel construction methods mainly include: middle pilot tunnel construction method, three pilot tunnel construction method, single tunnel construction method and double tunnel full-section parallel construction method. Among them, under the conditions of grade Ⅳ and Ⅴ surrounding rock, especially for large-section tunnels, the current three pilot tunnel construction method is mainly adopted. This construction method has the advantages of early closure of the main tunnel support and high structural safety during the construction process. The construction sequence is t...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to provide a safe, rapid and economical rapid construction method for long double-arch tunnels, which can solve the problem that the middle partition wall cannot be constructed before the middle pilot tunnel is penetrated in the construction of the three-pilot tunnel method, which leads to the inability to open the main tunnel The technical problems of excavation can be avoided, and the safety and quality hidden dangers brought about by the trench-hopping excavation method of the middle partition wall and the excavation method without pilot tunnel can be avoided

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