以“长江口二号”沉船整体打捞作业为背景,设计相应的打捞方案,采用弧形梁系统方式进行打捞.在正式穿引弧形梁前,需将端板纵梁组合体(打捞框架)吊装并沿着定位桩下放至海底.为确保穿梁过程的顺利进行,在设计吊装方案时需考虑在吊放过程中为控制打捞框架发生变形,设计了一套可多点吊装吊架的吊装方案,并采用具有一定弹性的环形吊带作为连接吊架与打捞框架的连接索具,可在有效控制打捞框架整体变形的基础上对打捞框架整体受力具有一定的缓冲作用.该研究验证了此吊装下放方案的可行性,为大吨位沉船整体打捞的打捞框架吊装下放提供技术支撑,同时也为后续类似大型钢结构高变形要求的海上吊装及下放提供一定的借鉴作用.

A wreck salvage scheme is designed for the integral salvage of “Yangtze River Estuary II” ancient ship, using the curved beam system to implement salvage. Before formally threading the curved beam, the end plate longitudinal beam assembly (salvage frame) should be hoisted and lowered to the sea bottom along the positioning pile. In order to ensure the smooth progress of the beam threading process, the hoisting scheme should be considered in the design of the hoisting scheme to control the deformation of the fishing frame during the hoisting process, and a set of multi-point hoisting scheme is designed. In addition, the ring sling with certain elasticity is used as the connecting rigging to connect the hanger and the fishing frame, which can effectively control the overall deformation of the fishing frame and have a certain buffering effect on the overall force of the fishing frame. This study verifies the feasibility of this lifting and lowering scheme, which can improve the technical support for lifting and lowering of the salvage frame for the overall salvage of large-tonnage shipwrecks in the future, providing a certain reference for the subsequent offshore lifting and lowering of similar large-scale steel structures with high deformation requirements.