A rapid construction method of T-beams in the shed opening of the upper-span business line in a narrow space

Abstract

The invention discloses a quick construction method for an over-crossing business line hangar tunnel T-shaped girder in narrow space. The quick construction method includes the following steps that ahangar tunnel foundation pit is dug according to a designed location and a hangar tunnel stand column is constructed; a hangar tunnel vertical girder is constructed, a bracket support is pre-buried and a gantry crane walking railway is set up on the bracket support; a distributive girder and a form board are laid on the top of the hangar tunnel vertical girder to be used as a T-shaped girder primary prefabricating platform, and a gantry crane is arranged on the gantry crane walking railway; a T-shaped girder is poured on the T-shaped girder primary prefabricating platform and hoisted to a vacant zone; if the vacant zone can not be laid fully, then the step is conducted repeatedly; the T-shaped girder primary prefabricating platform is demolished, and the form board is laid on the T-shapedgirder to be used as a T-shaped girder secondary prefabricating platform; a T-shaped girder is poured on the T-shaped girder secondary prefabricating platform and hoisted to a vacant zone and erectingof the T-shaped girder is completed; the T-shaped girder secondary prefabricating platform is demolished and auxiliary facilities are exerted; and other unnecessary facilities are demolished. The problem of insufficient prefabricating places can be solved and the risk of the hoisting operation near the business line is avoided.

Description

technical field [0001] The invention relates to a rapid construction method of a T-shaped beam spanning a business line shed hole in a narrow space. Background technique [0002] In the process of railway construction in the southwestern mountainous area, it is inevitable to encounter landforms along rivers and mountains, and a large number of high slopes and steep cliffs have been produced during the construction process. With the passage of time, many slope structure reinforcement measures built in the early years have gradually failed, and the weathering of the rock mass on the slope surface has become increasingly serious, and the stability has deteriorated. , affecting the driving safety of the business line. [0003] Building a new protective shed on the business line is an effective measure to control the slope of the tunnel entrance and exit and the dangerous rockfall on the side slope of the high cutting. The construction of the shed hole is divided into foundatio...

AI Technical Summary

Problems solved by technology

The construction conditions are often extremely unfavorable for adding sheds to business lines. The construction site is narrow and steep, and the established railway system forms an isolated and isolated environment for the construction site. Facing the prefabrication of T-beams without a site, it is difficult to construct scaffolding and gantry frames. Installation and other problems

Adding the shed to span the business line, the existing catenary system has caused great obstacles to the T-beam hoisting operation

If the T-beams are prefabricated in different places and then transported to the site by railcars for hoisting, the loading of railcars is limited and safety hazards are prominent, the time for power outages and blockades will be long, the construction progress will be slow, and the lease fee will increase, which will affect the operating efficiency of the business line

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