Construction method of corrugated steel web PC box girder cable-stayed bridge

Abstract

The invention discloses a construction method of a corrugated steel web PC box girder cable-stayed bridge. The method includes the following steps that the Nth corrugated steel web section is hoisted and longitudinally connected with the N-1th corrugated steel web section in place; a hanging basket is moved forwards and pulls the N-1th corrugated steel web section through stay cables; a bottom die is erected below the Nth corrugated steel web section, and a concrete bottom plate of the Nth corrugated steel web section is poured on the bottom die; after the concrete bottom plate is maintained and reaches preset strength, a steel tube support and a top die are sequentially erected on the concrete bottom plate from bottom to top, and a concrete top plate is poured on the top die; after the concrete top plate is maintained and reaches the preset strength, longitudinal and transverse pre-stress ribs in the concrete bottom plate and the concrete top plate are pulled to complete construction of one section. The method has the advantages that concrete of the top plate and the bottom plate of a corrugated steel web PC box girder is poured in different stages, and bearing capacity of an existing structure of the section is fully used to bear the dead load and the weight of a subsequent structure, so that the construction load of the hanging basket is reduced.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a construction method of a PC box girder cable-stayed bridge with corrugated steel webs. Background technique [0002] my country's research on PC box girder bridges with corrugated steel webs began in the mid-1990s, and more than 30 PC box girder bridges with corrugated steel webs have been built, most of which are simply supported girder bridges and continuous girder bridges. The understanding of PC box girder with web is becoming more and more mature, but for the construction method of PC box girder cable-stayed bridge with corrugated steel web, the theoretical research and practical experience are still insufficient. The traditional cantilever construction technology of the rear fulcrum hanging basket adopts the simultaneous pouring of the top and bottom slab concrete and the hanging basket bears almost all the segment weight, which increases the weight ...

AI Technical Summary

Problems solved by technology

The traditional hanging basket cantilever construction technology of the rear fulcrum adopts the simultaneous pouring of the top and bottom slab concrete and the hanging basket bears almost all the segment weight, which increases the weight and cost of the hanging basket, and the increased weight of the hanging basket is also extremely unfavorable to the force of the bridge structure constructed by the cantilever

Although the cantilever construction technology of the front fulcrum hanging basket can reduce the weight of the hanging basket, it needs to adjust the cable in stages and must set the rotating anchor when pouring a section, which is a complicated process

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