Construction Control Of Long-span Continuous Rigid Frame Bridge

With the development of science and technology and traffic enterprise more and more long-span prestressed continuous rigid frame bridges are constructed to span wide river and straits.It is difficult and impossible to buid them with bracket as before.Long-span continuous rigid frame bridges are always built by cantilevered construction techniques , and the process is difficult. It promotes the construction and bring back many problems.The constuction of long-span continuous rigid frame bridges needs a complex process. It will be affected by many certain and uncertain factores. The actual construction state of the bridges might deviate from the state of the theoretical design.Therefore,the bridge construction control emphasizes the problem-finding out and error-adjusting in time and analyse the following state by the latest new parameters and predict the most ideal line shape,so as to guarantee the construction system under control.The Shiyan Jiangjun Rver Bridge is a 61+110+110+61m, four-span, prestressed continuous rigid frame bridges.It is built by cantilevered construction techniques.The line shape and force of the bridge is the two large targets of the construction control.I attended the construction control of the Shiyan Jiangjun River bridge,consulted many achievements of construction control and studied the factors that affect the displacement of box girder bridge through the construction.This Thesis bring forward an actual parameter identify method and give out calculating process according to self-adapted theory and the least-squarcs method. This thesis also bring forward an actual method that could eliminate the influence of displacement of temperature. The thesis discusses the modeling process, calculating method, parameters interrelated in the construction control and the least-squarcs method etc.