Research On Technologies Of Settlement Control Of Broaden Bridge Piles

Due to the continuous development of economy, the capacity of some old expressways cannot meet the requirement and should be widen, produced from which some problems of old bridges. In the bridge broad projects, the interaction of new and old bridge catches redoubled attentions from academic and engineers, especially the differential settlement from them. But currently, there is few researches on the settlement control of the bridge and there is no techniques in today's specifications for design and construction of bridges. So it is necessary to research the technologies of settlement control of broaden bridge piles and give suggestions to the design and construction of bridges.Based on the domestic and foreign research theory and application, associated the widen project of ZhengLuo expressway, calculate and analyze the mechanical properties of the joint of the new and ole bridges after the old bridge has been broaden, work out the maximal settlement that the joint can bear, establish the settlement control standard; By the use of finite element software and theory method, investigate the settlement control performance of the technologies of increasing the length and diameter or pile grouting, present the method to choose the proper settlement control technology; Through the analysis of the old bridge broad project, give out the influence factors and key technologies to the piles design and construction.The achievement of the thesis is of import theory significance and practical value to old bridge broad projects and act an important role for the improving of the specifications for design and construction.