Construction Method of Secondary Lining Structure of Long-span and Ultra-thick Tunnel

Abstract

The invention relates to a construction method for a large-span and ultra-thick tunnel secondary lining structure, comprising the following steps: dividing the tunnel secondary lining structure to be constructed into a first section, a second section and a third section; In subsections, a support system is set on the invert of the tunnel to support the first formwork, and the first side wall structure is formed by pouring; in the second subsection, the support system is heightened to support the second formwork, and poured to form a structure similar to that of the first side wall. The second side wall structure connected with the side wall structure; in the third construction section, a top bracing system is set on the invert of the tunnel, and the top bracing system is connected with the top bracing of the second side wall structure, and the first side wall structure is supported by the top bracing system. Three formworks were poured to form the top arch structure connected with the second side wall structure, thus completing the construction of the second lining structure of the tunnel. The invention adopts step-by-step flow operation and different formwork support systems, which solves the problems of difficulty and high risk in the overall construction of the large-span and super-thick secondary lining structure, and speeds up the progress of the construction period.

Description

Technical field [0001] The present invention relates to the field of tunnel construction engineering, which refers to a construction method of a large span ultra-thick tunnel two liner structure. Background technique [0002] With the continuous construction of tunnel engineering, the tunnel functions required for complex geological and special function are increasing, and the excavation cave is getting bigger and more complicated, and the construction conditions and the environment are increasingly complex. How to ensure the large span or super Construction safety of thick bisquipment will be what we have to consider and pay attention to. Combined with the actual situation, such as Jilin Beishan Siya Cross-country Ski Results, 32M large span 5m ultra-thick bisquipment, how to ensure that in span or The safety and simpleness of the thickness of the two lining construction will be the problem of facilitating the face. [0003] The current construction of the current tunnel billy i...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the prior art, to provide a construction method for a large-span and ultra-thick tunnel secondary lining structure, and to solve the problem of unstable support in the existing trolley formwork and one-time pouring secondary lining structure construction method , construction difficulty and high construction risk

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