Method of Constructing Steel-concrete Composite Beams Using Cross Cables

Abstract

The invention discloses a method of constructing a steel-concrete composite steel beam adopting a crossing type inhaul cable. The method includes the steps that firstly steel beam units are prefabricated, a plurality of temporary suspension pieces are arranged at the steel beam bottom plates, inhaul cable devices are correspondingly arranged at bridge steel beam erection machines simultaneously, after a first steel beam crossing the bridge opening is erected to be on position, suspension clasps at the bottom portions of the inhaul cables of the bridge steel beam erection machines and the suspension pieces of the steel beam bottom plates are mutually connected in a crossing mode to enable the inhaul cables of the midspan area to form a crossing cable-stayed condition; then the inhaul cablestress is stretched to a preset value to be locked; prefabricated concrete bridge deck slabs are installed; bridge deck slab wet joint concrete are poured; when the bridge deck slab wet joint concreteachieves the designed strength, the connection of the inhaul cables and the suspension pieces are relieved; a second steel beam crossing the bridge opening is erected, the construction of steel beamscrossing the two bridge openings is completed; and in turn, the construction of the whole bridge is completed. According to the method of constructing the steel-concrete composite steel beam adoptingthe crossing type inhaul cable, the material using efficiency of traditional non-bracket construction steel-concrete composite steel beam can be improved, the convenient and rapid construction and aseries of advantages are possessed, and wide application prospects in large and middle span composite beam erection are possessed.

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 crossed 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 th...

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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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