Sling tensioning and system conversion method for double-tower three-span plane main cable self-anchorage type suspension bridge

Abstract

The invention discloses a sling tensioning and system conversion method for a double-tower three-span plane main cable self-anchorage type suspension bridge. The sling tensioning and system conversion method comprises a first step of synchronously tensioning and anchoring a plurality of slings horizontal at an identical vertical bridge direction position; a second step of enabling sling tensioning within a full bridge to be performed at four operation positions simultaneously at most, enabling two side spans to be two operation positions respectively, and enabling two half spans of a main span to be two operation positions respectively; a third step of symmetrically tensioning slings of two half-bridges with a main span midspan serving as a limit; a fourth step of tensioning and anchoring side span slings from a side span midspan to two sides one by one within the range of each half-bridge, synchronously tensioning every two adjacent slings in remaining slings which are not tensioned or anchored from a main tower to the midspan, tensioning and anchoring slings close to the main tower, enabling another sling to be tensioned to some cable force and be temporarily anchored, and circulating until all slings are tensioned and anchored. According to the sling tensioning and system conversion method, a construction speed is quick, a construction period is greatly shortened, needed jacks and extension bars are fewer, and the cost is greatly reduced.

Description

technical field [0001] The invention relates to the field of self-anchored suspension bridges, in particular to a self-anchored suspension bridge suspension cable tensioning and system conversion method with two towers and three spans. Background technique [0002] Self-anchored suspension bridges do not need to build bulky anchors, have low requirements on geological conditions, flexible span layout, and good landscape effects, and their applications are increasing [1] . The bridge shapes of the self-anchored suspension bridge mainly include single-tower single-span (only the main span has slings), single-tower double-span (both main and side spans have slings), double-tower single-span (only the main span has slings), Two towers and three spans (both main and side spans have slings), two towers and two spans, multiple towers and multiple spans, etc. [1] . [0003] One of the erection methods of self-anchored suspension bridges is the "cable first and then beam" method w...

AI Technical Summary

Problems solved by technology

This method is only suitable for self-anchored suspension bridges with combined girders for main girders with small spans

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