Construction method for cable-stayed bridge dismantling

Abstract

The invention discloses a construction method for cable-stayed bridge dismantling. The method is characterized in comprising the following steps that: S1, carrying out early-stage detecting and troubleshooting work: reinforcing and solidifying a tower pier; S2, installing a temporary reinforcement system on a main girder: adding a stiffening girder on the main girder, and adding a temporary stay cable between the stiffening girder and a main tower; S3: dismounting the stay cable after the stay cable is tensioned: replacing an old stay cable through a temporary stay cable, carrying out tensioning, gradually cutting off the replaced old stay cable, and dismounting the old stay cable; S4, carrying out segmented cutting and main girder hoisting: through the stiffening girder, carrying out segmented cutting on the main girder, and hoisting the cut main girder; S5, repeating S4 to S5 until the old stay cable and the main girder are dismounted by segments; S6, dismounting the main tower; andS7, dismounting an approach bridge and a bridge abutment. The construction method for the cable-stayed bridge dismantling has a core that the stiffening girder and the temporary stay cable are added to form the temporary reinforcement system, and the old stay cable and the main girder of a bridge surface are gradually dismounted by the way. The way is unique and novel, is convenient and efficientin construction, is low in cost and conforms to modernized construction requirements.

Description

technical field [0001] The invention relates to a construction method for dismantling a 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 cable-stayed rods are separately arranged on both sides of the bridge tower,...

AI Technical Summary

Problems solved by technology

[0004] In the actual demolition process, the existing old bridge still has many construction difficulties, for example, the stability of the bridge system is poor; when the bridge is demolished in sections, the axial compressive stress of the The strength is unknown, and the old suspenders need to be cut off one by one in a certain order when dismantling

[0005] In summary, the existing bridge demolition methods all have their limitations

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