北江大桥引桥整体顶升施工技术

发布时间：2018-01-11 08:27

本文关键词：北江大桥引桥整体顶升施工技术　出处：《桥梁建设》2014年01期 　论文类型：期刊论文

【摘要】：北江大桥为多跨连续梁桥,由于佛开高速扩建,主桥需加高2.364m以满足通航要求,考虑整座桥的调坡影响,引桥需加高0.150~1.491m,经研究引桥采用PLC控制液压同步顶升系统进行整体顶升施工,并设计钢抱箍作为液压千斤顶顶升的承力平台。顶升前先进行辅助墩与边墩的处理和梁体解联;然后进行立柱加粗、安装钢抱箍、梁体切割、称重和试顶升;分5步对梁体进行正式顶升;最后对立柱进行接长、加粗和落梁,完成整个顶升施工过程。通过安装纵、横向限位装置保证了顶升施工质量和梁体安全。施工中对顶升过程进行全程监控,及时调整了顶升过程的偏差,监控结果表明顶升施工质量良好。
[Abstract]:Beijiang Bridge is a multi-span continuous girder bridge. Due to the high speed expansion of Buddha, the main bridge needs to be raised by 2.364m to meet the requirements of navigation. Considering the influence of the whole bridge's slope adjustment, the approach bridge needs to be raised by 0.150 ~ 1.491m. The PLC control hydraulic synchronous lifting system is adopted in the whole lifting construction of the approach bridge. The steel hoop is designed as the support platform of hydraulic Jack. The auxiliary pier and side pier are treated before lifting and the beam body is unconnected. Then the column is thickened, the steel hoop is installed, the beam body is cut, the weight is weighed and the test lifting is carried out; 5 steps to the formal elevation of the beam; Finally, the length of the column, thickening and falling beam, complete the whole process of lifting construction. Through the installation of longitudinal, horizontal limit device to ensure the quality of construction and safety of the beam. The deviation of the jacking process is adjusted in time, and the monitoring results show that the quality of the jacking construction is good.
【作者单位】：华南理工大学土木与交通学院;广东省长大公路工程有限公司;广东罗阳高速公路有限公司;
【基金】：国家自然科学基金(51208208) 中央高校基本科研业务费专项资金资助(2014ZZ0019)~~
【分类号】：U445.4
【正文快照】： 1概述北江大桥是位于佛开高速上的一座多跨连续梁桥,全长1 370m,跨径组成为:28×20m(连续工字梁)+(40+7×50+40)m(连续箱梁)+16×20m(连续工字梁)+4×15m(连续工字梁)。引桥为连续工字梁,单幅桥面宽12.098m,桥面板厚0.2m,单幅4片工字梁,梁高1.1m,横向梁间距3.2m,均为预应力A

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