Method of constructing steel-concrete composite beam by vertical cable

Abstract

The invention discloses a method adopting vertical stay ropes to construct steel-concrete composite girders. Firstly, steel girder units are prefabricated, multiple temporary suspending pieces are arranged on flanges of steel girders in a spaced way, and meanwhile multiple groups of stay rope devices are correspondingly designed on a bridge girder erection machine; during construction, first holedsteel girder units are erected in place, then suspension clasps at the bottoms of the stay ropes on the bridge girder erection machine are connected with the suspending pieces on the flanges of steelgirders to make the stay ropes in a vertical state, then rope forces of the stay ropes reach set value through stretching and drawing, and then the stay ropes are locked; prefabricated concrete bridge deck slabs are installed; bridge deck slab wet joint concrete is poured, and after the bridge deck slab wet joint concrete reaches the design strength, connection between the stay ropes and the suspending pieces is relieved; then, second holed steel girder units are erected to complete 'simple-bracing variable-continuity' system conversion of two-holed steel girders is completed; by this analogy, construction of a whole connected bridge is completed. The method can improve the material utilization efficiency of traditional support-free steel-concrete composite girder construction, has a series of advantages of quick and convenient construction and the like and has the wide application prospect in large-medium-span composite girder erection.

Description

technical field [0001] The invention relates to a construction method of a steel-concrete composite beam, in particular to a method for constructing a steel-concrete composite beam by using vertical cables. Background technique [0002] The steel-concrete composite beam has a series of advantages such as light structure, large spanning capacity, and fast construction speed. It can meet the construction requirements of urban viaducts and long bridges across rivers and seas to the greatest extent, and has been more and more widely used in modern bridge structures. [0003] Due to the different construction procedures and construction methods of steel-concrete composite beams, their stress states are also different. According to the stress state of the composite beam construction, it can be divided into two types of structures: 1) Live-loaded composite beams, that is, construction without supports. During the construction process, the steel beams and concrete are all borne by t...

AI Technical Summary

Problems solved by technology

However, if limited by construction conditions, when it is impossible or unsuitable to erect supports at the bridge site, construction methods without supports are often used for construction. During the construction of traditional steel-concrete composite beams without supports, the steel beams need to bear their own weight and construction loads. and concrete self-weight, etc., in order to meet the construction requirements, the rigidity of the steel beam is required to be greater than that of the dead-load composite beam, which causes a waste of materials to a certain extent for the steel-concrete composite beam that bears the same load after the bridge is completed

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