Tunnel invert zone division and process division streamlined construction method

Abstract

The invention discloses a tunnel invert zone division and process division streamlined construction method. The tunnel invert zone division and process division streamlined construction method includes the following steps that a first step, a telescopic mobile trestle enters a tunnel; a second step, the operation of an invert excavation initial support area is carried out in a sectional circulation mode; a third step, rebar binding of an invert lining area is conducted when the construction of the invert excavation initial support area is conducted or after the construction of the invert excavation initial support area is finished; an invert formwork is transported from an invert filling area to the invert lining area in a hanging mode, concrete of the invert lining area is poured; at thesame time, a central ditch formwork is pulled to the invert filling area, and the concrete of the invert filling area is poured; and a fourth step, after the concrete intensity of the invert filling area reaches the standard, and the telescopic mobile trestle is started to be moved into the next construction cycle. According to the tunnel invert zone division and process division streamlined construction method, each construction cycle can save 27 hours, time of the invert construction is saved, the rapid follow-up of secondary lining is promoted, it is ensured that the safe step distance management is controllable, the rapid construction of faces is pushed, and lining safety and stability are ensured.

Description

technical field [0001] The invention belongs to the technical field of engineering construction, and in particular relates to a streamlined construction method for each process of a tunnel inverted arch applied in the fields of railways, highways, water conservancy and the like. Background technique [0002] At present, the construction of railway tunnel projects is restricted by the red line of safety step management, the construction period is long, the staffing is super high, and the safety, quality and economy cannot meet the needs of the current project construction. [0003] The construction of the inverted arch of the railway tunnel is a key process on the key line. The excavation and support took 30.2 hours, the inverted arch lining took 57.5 hours, and the inverted arch filling took 58.5 hours. One is that the construction process takes a long time, the inverted arch cannot be closed into a ring in time, the safety step distance of the lining cannot be shortened in...

AI Technical Summary

Problems solved by technology

One is that the construction process takes a long time, the inverted arch cannot be closed into a ring in time, the safety step distance of the lining cannot be shortened in time, and the poor structural stability will easily lead to safety out of control; the other is that there is only one work area, and each process can only be operated step by step The construction channel between the follow-up and the working surface was interrupted, resulting in the basic suspension of the working surface, and the construction organization progress was restricted for many years and could not form a virtuous circle; third, it was difficult to fully maximize the use of the construction machinery and personnel deployed, and the construction cost was controlled High difficulty

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