Construction Control & Stabilization Analyse Of High Pier And Long Span Continuous Frame Bridge

With the development of national economy and bridge design and construction technology, because of the construction convenience, low cost, rational load-bearing, and well comfortability of passing vehicles, long bridge prestressed continuous rigid frame bridge has been rapidly developed in resent several years. For these notable advantages, the continuous rigid frame bridges are comprehensive used in bridge construction in resent several years. Now, a large number of continuous rigid frame bridges have been constructed in China, and the maximum span has reached 270m that is Humen Auxiliary Shipping Channel Bridge, which shows that the attracting achievement have been achieved. The construction difficulties of continuous rigid frame bridges become more serious with the larger span and higher pier. The construction control and stability analysis in construction phases become the most important part to ensure the construction quality and safety, and the important procedure to ensure the final bridge state reaching the design state.This thesis takes the example of construction of Liangcha River Bridge which is on Chongzhun highway in Guizhou Province, the finite element analysis on construction procedure was done, and the differences between calculation results and real results were analyzed. Then the control scheme was selected based on structure parameters adjusting, calculation data revising and feedback of control analysis. The self-adapt control method was used to forecast and control the construction process, and construction state was refined by forward and backward analysis methods, then the rational pre-camber was provided to guide construction. With the construction control methods, the fairly effect was achieved.The stability of bridge structure is one of the main issues which attaches to the structure safety. With the development of technology, long span bridges are daily more extensively used. Especially some bridges over valley, the height of its pier can reach more than 100 meters, so the stability of the pier during the construction becomes more important. In order to ensure the safety during the construction, the stability of high pier in construction phases is necessary. This thesis based on the Liangcha River Bridge, the stability in construction phase of the 2nd pier with the height of 101 meters was analyzed. And the analyzed results show that the strength and stability of the pier can satisfy the safety of construction phases under some worse combination of loads.