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承台墩身全预制桥梁墩台模块化吊装作业是港珠澳大桥工程施工的关键环节,主要介绍吊具及其抗浮装置设计,一级通用吊具采用全铰接,可使部件之间不存在次弯矩及其他有害应力;“万向节”选用Q690低碳高强结构钢,并对局部进行结构优化设计,有效减小其结构尺寸及自重;索具采用海洋工程高性能无接头钢丝绳圈,避免了多根钢丝绳索具因长度误差而导致的吊钩钩腔受力不均情况发生。二级吊具采用钢箱梁式结构具有高抗弯扭性能、高稳定性、高抗疲劳性能、高吊重能力及低挠度变形等优点;合理的止摆装置设计有效减弱涌浪对结构体系的挠动。装配式抗浮装置设计可抵消浮力造成的钢丝绳回缩量,确保止水成功实施。
Cap pier pier body prefabricated bridge pier modular lifting operation is the key link Hong Kong-Zhuhai-Macao Bridge construction, mainly spreader and anti-floating device design, a universal spreader with full articulation, the components can be avoided There are sub-moment and other harmful stress; “universal joint ” use Q690 low-carbon high-strength structural steel, and structural optimization of local design, effectively reducing the size and weight of their structure; rigging with high performance marine engineering without joints Wire rope ring, to avoid a number of rope rigging due to the length of the error caused by hook hook cavity force uneven situation occurred. Secondary spreader adopts steel box girder structure with the advantages of high flexural and torsional performance, high stability, high anti-fatigue performance, high hoisting capacity and low deflection deformation. Reasonable pendulum design can effectively reduce the influence of the surge on the structural system The flexible movement. Assembled anti-floating device design to offset the buoyancy caused by rope retraction volume, to ensure the successful implementation of stopwatch.