Study On Construction Technology Of Panel Concrete Deck Steel-concrete Composite Box Girder Bridge

At present, the box girder structure of steel-concrete combination with large span is widely applied into bridge construction, which develops based on the steel structure and concrete structure, fully absorbed the advantages of the two materials of steel and concrete.The box girder structure of steel-concrete combination possesses many characteristics such as large rigidity, high stability, and sound mechanical performance and so on, whose mechanical behavior and spatial mechanical properties have been estensively studied, and also have made great achievementsthe in the method of design theory, the method of experimental study and the method of calculation analysis.Nevertheless, at this present stage in the process of bridge construction, not only make the structure reasonable, at the same time but also need to pay attention to the comprehensive economic benefits. At this stage, the constructions of this kind of super large bridge employ the dynamic design, construction monitoring measurement, and design and construction depending on each other for existence hand in glove. But the stress of the concrete bridge deck is complex and changeable,so construction technology and the built-up sequence and way of concrete bridge deck construction should be more optimized, enhancing the overall technical and economic advantages of the bridge.This paper is based on shallow waters of the navigable hole of continuous bridge under construction bid CB05 of the Hong Kong-Zhuhai-Macao Bridge, and combines the existing theoretical basis with practical results. Through the field measurement and the finite element model analysis, carry out research work as follows:①Summarize the types and the design methods of concrete bridge deck stab.Through the relevant research results at home and abroad, this paper has summarized the effective method of width calculation of concrete bridge deck stab;has illustrated the design concept of the close contact of design and construction and also has discussed some difficult point problems in design and construction and some relevant solving measures has been putforward.②Research of the different order of concrete bridge deck stab.Through the finite element model, this paper has calculated and analyzed the influence of the two different orders of concrete bridge deck stab on the mechanics characteristics of bridge structure; based on the engineering background, the paper has analyzed the influence of the different length of post-cast strip on the bridge structure;and combining with the engineering actual situation to choose optimal construction method and built-up sequence.③Research of effects of the rise and fall of bearing on the bridge structure’s stress.The location of the continuous girder bridge bearing in the middle will produce negative bending moment which is very adverse both for steel box girder and the stress of the concrete bridge deck stab. Therefore the concrete bridge deck stab is too easy to produce cracks, doing greatly harm to the bridge. Combining with the engineering cases and midas model, this paper analyzes the construction methods of the rise and fall of bearing in detail.Combining with the domestic and foreign existing related theories and engineering cases, this paper has conducted related researches on the construction method of bridge deck stab of the box girder bridge of steel-concrete combination,and has put forward some construction optimization measures, having important reference value to further perfect our country’s design and construction methods of the box girder bridge of steel-concrete combination.