Fabricated light composite beam simply-supported variable-structure continuous structure and construction method thereof

Abstract

The invention provides a fabricated light composite beam simply-supported variable-structure continuous structure and a construction method thereof. The fabricated light composite beam simply-supported variable-structure continuous structure comprises two oppositely-arranged span steel-ultrahigh performance concrete light composite simply-supported beam prefabricated units, and a cast-in-place ultrahigh performance concrete pier top crossbeam arranged between the two oppositely-arranged span steel-ultrahigh performance concrete light composite simply-supported beam prefabricated units; the prefabricated units comprise a plurality of I-shaped steel beams, bridge deck slabs arranged on the I-shaped steel beams, and connecting parts arranged at the ends of the I-shaped steel beams; each connecting part comprises a first connecting part body arranged at the end of one prefabricated unit, and a second connecting part body arranged on the other prefabricated unit; and ultrahigh performance concrete is poured at the matched areas of the first connecting part bodies and the second connecting part bodies in place to form the pier top crossbeam. According to the fabricated light composite beam simply-supported variable-structure continuous structure and the construction method thereof, the problem that a traditional steel-concrete composite continuous beam hogging-moment-area bridge deckslab is prone to cracking when being pressed, and steel beams are prone to losing stability due to being pressed is solved; a continuous bridge is better in durability and longer is service life, meanwhile, on-site zero welding can be achieved, the on-site operation amount is reduced, the fabricating efficiency of the structure is improved, and fabricated and rapid construction is facilitated.

Description

technical field [0001] The invention relates to the technical field of a bridge component and its construction, in particular to an assembled light-duty composite beam simply supported variable structure continuous structure and a construction method thereof. Background technique [0002] At present, prefabricated steel-concrete composite beams have been more and more widely used because they can make full use of the performance of steel in tension and the performance of concrete in compression. However, in the negative bending moment area, there will be unfavorable situations where the concrete is under tension and the steel beam is under compression. During normal use, the concrete bridge deck is prone to cracking, which reduces the stiffness of the composite beam and affects the safety and durability of the structure. In terms of construction performance, in the prefabricated steel-concrete composite beam, the bridge deck is partially prefabricated, and the workload of po...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art and to provide a simple-supported variable-structure continuous structure of assembled light-duty composite beams and its construction method which is convenient for construction and avoids the problem of bearing negative reaction force. It is composed of high-performance concrete, the stress of the negative moment zone of the continuous construction bridge is improved, the concrete bridge deck is not easy to crack, the problem of steel beam stability under compression is solved, the durability is better, and the service life is longer. Realize on-site zero welding, reduce on-site workload, improve the assembly rate of the structure, and facilitate assembly and rapid construction

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