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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。
In order to solve the problem of insufficient clearance of the existing bridges, bridge demolition and reconstruction are avoided and the overall ascent safety technology is developed. Take Zhuhai Qianfeng Bridge as an example, determine jacking underpinning system, the jacks along the axis of the bridge layout, the first overall synchronization jacking, after the pier by the top of the lift, and the beam body ascending elevation control within 10cm safety range ; Then using post-anchorage anchorage reinforcement, static cutting, micro-expansion concrete column connection reinforcement and piers micro-dislocation treatment technology to solve the original multi-span bridge construction safety reinforcement column, beam reinforcement and struts interrupted, then Higher problems. After lifting the bearing capacity of the bridge static load test. The results show that the total deflection of the beam under design load is within 3.4 mm and the calibration coefficient range is 0.7 ~ 0.8 after the lifting of the bridge. The total strain of each beam is within 84με, the calibration coefficient range is 0.8 ~ 0.9, carrying capacity to meet the requirements of safe operation.