跨既有铁路线斜拉桥拆除安全控制技术

旧桥拆除工程是一项技术难度大并具有较大安全风险的施工工程,为了保证桥梁拆除工程的有效、快速进行,在旧桥拆除过程中的安全控制就显得至关重要。针对大里营斜拉桥拆除工程,对施工方案的每个工况做仿真分析计算,确定关键工况及控制截面,并与实际测得的数据(应力、位移等)进行对比分析,确定结构受力状态,为拆除工程提供科学有效的数据参考。拆除施工安全始终处于可控状态,确保了施工进度,取得了良好的经济效益。

Safety Control Techniques for the Removal of Cable-Stayed Bridges Spanning Existing Railways

The removal of old bridges is always technically difficult and much risky in safety. To ensure the efficient and rapid performance of the removal of old bridges,the safety control plays a vital role in the course of the removal of old bridges. With the project of the removal of the Daliying Cable-stayed Bridge as a practical example, the various construction conditions of the project are simulated and analyzed in the paper, with all the key construction conditions of the construction scheme and all the control sections determined,which are also compared with the really-surveyed values （such as the stresses and displacemnt） and analyzed so as to determine the state of the structure under action and provide scientific and effective numerical reference for the removal engineering. With the safety control techniques adopted, the safety of removal construction is always kept under control, with the construction progress ensured and excellent economic benefit achieved.