Mined metro station second lining buckle arch construction method

Abstract

The invention discloses a mined metro station second lining buckle arch construction method. The mined metro station second lining buckle arch construction method comprises the steps of making a mobile assembled mould base system with corresponding radian before the construction of a second lining buckle arch; labeling breaking length and height on a pilot tunnel initial support side wall to breaka pilot tunnel initial support; after the pilot tunnel initial support is broken, carrying out waterproof construction; after waterproof construction is finished, binding a second lining buckle archreinforcement; after the second lining buckle arch reinforcement is bound, mounting a template bracket; after the template bracket is mounted, pouring second lining buckle arch concrete; after the pouring is finished, carrying out the construction of the next section of second lining buckle arch; and meanwhile, arranging a steel tie rod on the just-finished previous section of second lining bucklearch; detaching an all-round supporting frame at the lower part of the previous section of template bracket; using a jack to release force; enabling an upper part mould base to fall on a mobile track; and using a chain block to pull the mould base system to advance. By improving the construction step sequence and the mobile assembled mould base system, resource input is effectively reduced, the building cost is reduced, and the construction efficiency is enhanced.

Description

technical field [0001] The invention relates to a subway engineering construction technology, in particular to a method for constructing a second lining buckle arch of a subway underground excavation station. Background technique [0002] With the development of the urban rail transit system, the improvement of municipal facilities, the maturity of subway construction technology and construction methods, and the improvement of social environment requirements for engineering construction, the subway PBA underground excavation station has fewer construction procedures, less ground subsidence, and is easy to implement green construction. The construction method has been widely used and popularized. The main features of this underground excavation method are: using small pilot holes to build enclosure piles and beams, and then constructing a secondary lining arch cover structure to form a complete force-bearing system, ensuring that the underground excavation can be carried out i...

AI Technical Summary

Problems solved by technology

This two-lined buckle arch construction technology has the following disadvantages: before the construction of each section (warehouse) two-lined buckle arch, it is necessary to repeatedly destroy the initial support side wall structure of the pilot tunnel, clean the ground foundation, and level the ground in the cave before carrying out full house construction. After the erection of the support frame and the assembly of the formwork, the formwork system needs to be dismantled after the construction of each section (bin) structure, resulting in repeated investment of manpower and material resources, long construction period, and large space occupation.

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