Construction method for hoisting steel-structure box girder to cross original high racks

Abstract

The invention discloses a construction method for hoisting of a steel-structure box girder to cross an original high racks, which comprises the following steps: (1) analyzing construction condition and taking steam cranes in proper positions; (2) arriving at the designated positions for steel beam transporters and hoisting the box girders to a first position by a first crane and a second steam crane at the same side and then delivering the box girders to a second proper position over two high racks; and (3) catching the box girders in air by utilizing a third steam crane at the opposite side to vortically place the box girders in a new ramp installation position and carrying out welding for fixing. In construction process of hoisting the steel-structure box girders to cross the original high racks, the invention uses coordination hoisting of three steam cranes and hoisting in place for three times to successfully complete the steel beam hoisting construction under the premise of ensuring steel structure quality and hoisting safety, and does not greatly influence the high racks and transportation on ground level roads.

Description

technical field [0001] The invention belongs to the technical field of building construction, and in particular relates to a hoisting construction method of a steel structure box girder, in particular to a hoisting construction method of a steel structure box girder spanning an existing elevated bridge. Background technique [0002] With the development of urban construction, road traffic is becoming more and more busy, and the modern traffic mode is gradually shifting from plane traffic to three-dimensional traffic, and new elevated roads or ramps often cross the original elevated roads. Due to the existence of the original viaduct, it brings difficulties to the construction of the new viaduct or ramp, especially the steel structure box girder, as an important construction component, needs to be hoisted to the construction position of the viaduct. Due to the obstruction of the original viaduct, the steel structure cannot be directly There is no construction precedent for th...

AI Technical Summary

Problems solved by technology

Due to the existence of the original viaduct, it brings difficulties to the construction of the new viaduct or ramp, especially the steel structure box girder, as an important construction component, needs to be hoisted to the construction position of the viaduct. Due to the obstruction of the original viaduct, the steel structure cannot be directly The box girder is hoisted in place, so far there is no construction precedent

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