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跨海大桥设计多采用高墩大跨的缆索体系形式,对于此类桥梁的墩塔施工,不论是采用混凝土材料进行现场浇筑,还是采用预制钢塔进行现场拼装,其难度往往是影响桥梁整体质量的关键因素。对于整体吊装施工技术,虽然可以缩短工期,节约施工成本,但工程建设条件复杂,塔段超长、超重等不利原因导致施工难度大、危险性高。港珠澳大桥江海直达船航道桥138号墩钢塔成功地采用了预先拼装再海上施工现场整体吊装的施工工艺,该方案克服了海上作业的多种不确定性因素,减小了海上施工的安全风险和对海洋生态环境的污染,确保了工程质量,为今后跨海大桥的高耸桥塔施工提供了宝贵的技术参考。
The design of cross-sea bridges mostly adopts the cable system of high-pier and long-span. For the construction of piers of such bridges, either the on-site pouring with concrete materials or the prefabricated steel towers are carried out on site, the difficulty is often the overall quality of the bridge The key factor. For the overall hoisting construction technology, although the construction period can be shortened and the construction cost can be saved, the construction conditions are complex, the tower section is too long, and the overweight and other unfavorable causes cause great difficulty in construction and high danger. The steel tower of Pier Pier 138 at Jianghai Zhidao Bridge of Hong Kong-Zhuhai-Macao Bridge has successfully adopted the construction technology of hoisting pre-assembled and then hoisted at sea construction site. This solution overcomes many uncertainties in offshore operations and reduces the risk of offshore construction The safety risk and the pollution to the marine ecological environment have ensured the project quality and provided valuable technical reference for the construction of the towering pylons of the trans-sea bridge in the future.