A method for removing an upper structure of an overwater thin-cable system cable-stayed bridge

Abstract

The invention discloses an overwater thin-cable system cable-stayed bridge upper structure removing method which comprises the following steps: S1, temporary buttresses are arranged near a main tower,and the temporary buttresses are made to be supported below a solid section of a bridge body main beam; S2, a stay cable on the side span side is removed, and a cable force is adjusted to keep the cable force of the stay cables on the two sides of the main tower in symmetrical balance; S3, the first cable force and the second cable force are symmetrically released, a hanging hole beam is removed,and the hanging hole beam is hoisted by adopting a large floating crane; the third cable force and the fourth cable force are symmetrically released, a mid-span beam is removed and hoisted by adopting the large floating crane; a fifth cable force is symmetrically released, a mid-span cross beam is removed and hoisted by adopting the large floating crane; the stay cables are removed; longitudinalbeams, edge beams and the main tower are disassembled in a segmented mode, and all the components are hoisted through the large floating crane; and S4, the hoisted components are conveyed to a wharf along a designed route and transferred to a sand field and crushed the in the sand field by a crusher, and the components are sent to designated positions in a partitioning manner. The method has the advantages of ensuring normal passage of the channel and being safe and stable.

Description

technical field [0001] The invention mainly relates to the technical field of dismantling cable-stayed bridges, in particular to a method for dismantling the superstructure of a cable-stayed bridge with a thin cable system over water. Background technique [0002] With the gradual decline of the bearing capacity of old bridges and the increase of reconstruction and expansion projects, the demolition or reconstruction of old bridges and some "aging" bridges that affect urban planning are put on the agenda, which will inevitably lead to a large number of old bridges that need to be demolished. When demolishing urban areas, places with relatively high population density, and some bridges across rivers and rivers, the non-blasting demolition method will be considered first. At present, there are no special construction specifications and technical guidelines for bridge non-blasting demolition, especially for the demolition projects of cross-river and cable-stayed bridges with co...

AI Technical Summary

Problems solved by technology

The demolition is carried out completely according to the reverse process of bridge construction. There are many supports, the erection period is long, and the navigation will be interrupted, which is inconsistent with the current navigation level requirements; it is difficult to ensure the horizontal stability of the longitudinal beams when the frame beams are removed.

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