运营高铁高压喷射注浆桩桥墩纠偏技术

Deviation Correction Technology for High Pressure Jet Grouting Pile Bridge Pier of Operating High-speed Railway

以广珠城际铁路沙朗特大桥为研究对象,基于弹性地基梁原理,利用高压喷射注浆桩的喷射压力进行桥墩及桥台的纠偏,建立高压喷射注浆桩的桥墩纠偏联动装置模型,提出纠偏技术并得到成功应用。实施结果表明:通过高压喷射注浆桩纠偏后桥梁及轨道结构状态稳定,为恢复桥梁正常使用功能,对偏移量大于5 mm地段桥墩原则上应进行纠偏处理,对偏移量小于5 mm地段桥墩结合前后墩台偏移值进行判定。

Taking Shalang Grand Bridge of Guangzhou-Zhuhai intercity Railway as the research object,based on the principle of elastic foundation beam,the bridge pier and abutment are corrected by the injection pressure of high-pressure jet grouting pile,and the linkage model of pier deviation correction is established.The deviation correction technology is proposed and successfully applied.The results show that the deformation and displacement of pier structure caused by skylight point construction are much smaller than the influence of train operation and temperature on track deformation during daytime.After correcting the deviation of the bridge and track structure by high pressure jet grouting pile,the pier in the section with offset greater than 5 mm should be ic monitoring;stability corrected in principle,and the pier in the section with offset less than 5 mm should be corrected according to the offset values of the front and back piers.