Method for asymmetrically dismantling cable-stayed bridge

Abstract

The invention discloses a method for asymmetrically dismantling a cable-stayed bridge. A mechanical method is firstly adopted to dismantle a half-span girder according section by section and block by block, and then the other half-span girder and a bridge tower are integrally dismantled. No big vibration impact is generated during the bridge girder dismantling process, so no influence is brought to the surrounding buildings and lives of residents; the self bearing capacity of the bridge girder is fully utilized during the first dismantling process of the half span, the dismantling is carried out without supporting, no support tool is needed, so the construction links and construction cost are reduced; a diagonal member at one side of the anchoring part is dismantled at first, a bridge body around the diagonal member is broken, after the self weight of the bridge body is reduced, the diagonal member at the other side is then removed, so the safety factor of the dismantling process is greatly improved; and the bridge tower and the consolidation part of the girder are structurally softened, when piers are gradually removed for letting the girder to gradually fall to the ground, under the dragging of the diagonal members and the self weight of the girder, the bridge tower integrally falls to the ground due to the insufficient flexural bearing capacity of the cross section, so the whole dismantling process is low in cost, and has good controllability and high safety.

Description

technical field [0001] The invention belongs to the technical field of bridge demolition construction, in particular to a method for dismantling an asymmetrical cable-stayed bridge. Background technique [0002] Cable-stayed bridge, also known as cable-stayed bridge, is a bridge in which the main girder is directly pulled on the bridge tower with multiple prestressed rigid cable-stayed rods. A structural system composed of beams and bodies. The cable-stayed bridge mainly includes two piers, tower piers, bridge towers, main girder and multiple cable-stayed rods; the two bridge piers and the tower piers are vertically arranged at the two ends and the middle of the cable-stayed bridge respectively; the main girder spans the two On the top surface of a bridge pier and a tower pier, it is composed of a plurality of main girder sections connected end to end; the bridge tower is vertically installed on the main girder located on the upper part of the tower pier; a plurality of cab...

AI Technical Summary

Problems solved by technology

Although the static blasting method has no vibration, no noise, and no flying rocks, for prestressed bridge structures, the direct use of this method may be affected by the prestress and the effect is not good; the advantages of the controlled blasting method are one-time success and fast speed , the effect is obvious, the direction of collapse and the scope of damage can be controlled, but the air shock wave, vibration, flying objects, dust and noise generated during blasting will affect the surrounding structures

The advantages of the mechanical demolition method are low pollution and noise, safe demolition process, and low overall cost, but the construction period is longer

For the reverse process demolition method, since the specific working performance of some old bridges is difficult to accurately evaluate, without reliable support, the risk of the demolition process will increase

In summary, none of the existing bridge demolition methods can comprehensively solve the problems of success rate, construction period, cost and safety during bridge demolition, and the scope of use is limited

Images