Abstract

With the rapid development of municipal bridges, more and more complex steel structure bridges are constructed. Steel box arch bridges are widely used in municipal bridges due to the characteristics of light weight, high strength, large span capability and graceful shape, etc., and their high environmental adaptability is the reason that mostly used for cross-river bridges of urban . As the increasing challenges for design and span of steel box arch bridges, higher requirements are rendered for controlling the quality of bridge construction accurately and digitally, in which the quality of steel structure manufacturing is the base and the quality of arch rib shape controlling is a challenge. Though more bridge construction projects utilize BIM for quality controlling, a new method with more efficiency and accuracy is required to complement a dynamic control for the whole life circle.

With the base that lean construction theory could bring the increment to value of construction quality, and in view of the problems existing in the quality control of traditional steel box basket arches, this research will introduce lean construction concept, supported by BIM technology, 3D laser scanning technology and virtual assembly technology, build the base theory of lean construction of steel box basket arch process control model, forming a whole process total factor quality control mode with virtual assembly as the main means. At the same time, the process and method of the whole process management and control of the steel box basket arch from the detection of off-line pre-assembly to the real-time monitoring of the arch rib alignment control to the closure are given, besides, combine relevant quality specifications to propose quality control indicators and judge and improve quality status by process quality capability. In order to reduce waste while achieving efficient and accurate dynamic control of the whole process, and then achieve lean quality control, digitization and integration of the whole process, more effectively achieve quality objectives, and ultimately achieve the purpose of project value enhancement. Finally, the method is applied to a bridge project in Wuhan. The method can effectively improve the efficiency, precision and control level of the quality control of the whole process of the steel basket basket arch, which plays an important role in the project value enhancement. This thesis has certain reference significance for the quality control of other large steel bridges.

Key words: steel box basket arch    quality control    lean construction    BIM linear control