既有多跨桥梁整体顶升安全技术研究与实施——以前锋涌大桥为例

发布时间：2018-01-29 15:22

本文关键词： 桥梁净空整体顶升加固技术检测　出处：《中国安全科学学报》2014年07期 　论文类型：期刊论文

【摘要】：为解决既有桥梁净空不足的问题,避免桥梁拆除重建,开发整体顶升安全技术。以珠海市前锋涌大桥为例,确定顶升托换体系,将千斤顶沿桥轴线布置,先整体同步顶升,后逐墩台顶升,且梁体顶升高差控制在10 cm安全范围内;然后采用后锚固植筋加固、静力切割、微膨胀混凝土立柱连接加固和墩柱微错位处理等技术,解决多跨桥梁顶升安全施工中的原结构柱、梁加固和支柱打断、接高等难题。对顶升后桥梁承载力进行静载试验检测。结果表明,桥梁顶升完毕后,在设计荷载检测下梁体总挠度均在3.4 mm以内,其校验系数范围为0.7~0.8;各梁总应变在84με以内,其校验系数范围为0.8~0.9,承载能力满足安全运营要求。
[Abstract]:In order to solve the problem of insufficient clearance of existing bridges, avoid the bridge demolition and reconstruction, and develop the whole lifting safety technology, taking Zhuhai forward Chung Bridge as an example, the jacking support system is determined and the Jack is arranged along the bridge axis. The elevation of the beam is controlled in the safe range of 10 cm. Then the post-anchoring reinforcement static cutting micro-expansion concrete column connection reinforcement and pier column micro-dislocation treatment are adopted to solve the original structure column beam reinforcement and support interruption in the safety construction of multi-span bridge jacking. The test results show that the total deflection of the beam is less than 3.4 mm under the design load test. The range of calibration coefficient is 0. 7 ~ 0. 8; The total strain of each beam is within 84 渭蔚, and the check coefficient is 0.8 渭蔚. The load carrying capacity can meet the requirements of safe operation.
【作者单位】：辽宁工程技术大学土木与交通学院;中铁隧道集团一处有限公司;
【基金】：国家自然科学基金资助(50978131)
【分类号】：U445.4
【正文快照】： 0引言随着水路运输能力的不断增长,大型运输船只对既有桥梁的桥下净空通行能力提出了更高的要求[1]。对既有桥梁进行拆除重建,既不经济,又需要很长工期。采用桥梁整体顶升来增加桥下净空的方法则可避免既有桥梁拆除重建,对周边交通及环境影响也较小。目前,国内外在桥梁顶升方

【相似文献】