| With the continuous constructions of bridges in recent years, as a lifeline project, the constructing oscillation of these bridges have become an increasingly serious problem, In the urban construction especially in the extension project, the application of pile foundation has been already more and more extensive. But because pile construction is often a compelled vibration course, so it regularly involves a problem that the project shaking leads to the safe assurance questions of building facilities,lives and properties around. The development of the technology of the project vibration tests has offered scientific support for solving this kind of problem. But because of the complexity of the vibration course underground, how to confirm the rational calculation model and optimize the means of testing and the method of estimating is the key point of examining oscillation.This thesis uses Fo-Kai high-speed extension project that the vibration of basic construction in Jiujiang bridge main mound as the background, have mainly finished the following aspects:(1) Through controlling the degree and range that the basic construction of extending Jiujiang bridge main mound affects two existing Jiujiang bridges pier pile on its both sides and the upper structure of bridges, we confirm the rational monitoring scheme.(2) On the basis of evaluating the situation of two main Jiujiang bridges before and after constructing on the bridge main mound extension , through calculating and analyzing the motive force performance of under constructing perturbation, this article estimates the security of the two existing bridges during working and evaluates the effects brought by the construction of extending Jiujiang bridge main mound in an all-round way.(3) This thesis offers some consulting suggestions for a basic construction method and craft of extending Jiujiang bridge main mound in real time, and assures the security of the existing bridges during constructing finally. |
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