Lifting and Lowering of Salvage Frame for Integral Salvage of Large Tonnage Wreck

doi:10.16183/j.cnki.jsjtu.2023.S1.22

Abstract

Abstract:

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.

Key words: wreck salvage, curved beam, salvage frame, lifting

CLC Number:

U615.9

WEI Liangmeng, ZHU Xiaodong, YI Qian, CUI Jin, ZHOU Dongrong. Lifting and Lowering of Salvage Frame for Integral Salvage of Large Tonnage Wreck[J]. Journal of Shanghai Jiao Tong University, 2023, 57(S1): 170-177.

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钢材	牌号	钢材厚度或直径/mm	强度设计值/MPa
钢材	牌号	钢材厚度或直径/mm	抗拉、抗压、抗弯	抗剪
碳素结构钢	Q235	≤16	215	125
		>16, ≤40	205	120
		>40, ≤100	200	115
低合金高强度结构钢	Q345	≤16	305	175
		>16, ≤40	295	170
		>40, ≤63	290	165

项目	应力类型	应力最大值/ MPa	应力许用值/ MPa	最大变形/mm	屈曲特征值	评估结果
1	等效应力	48	295	1.3	182	OK
2	剪应力	19.6	170	1.3	182	OK

项目	参数	有限元计算值 (最大值)	许用值	评估结果	备注
打捞框架	位移/mm	8.097	10	OK	无
吊架	梁的合成应力/MPa	93.14	235	OK	屈服评估
	梁的最大压应力/MPa (H400 m×21 m/400 m×13 m)	-49.29	-224.6	OK	屈曲评估(参考《钢制海船入籍规范2018》第8章)
	梁的最大压应力/MPa (H300 m×15 m/300 m×10 m)	-34.75	-205.6	OK	屈曲评估(参考《钢制海船入籍规范2018》第8章)

序号	名称	规格	数量	总质量/t	备注
1	端板+顶梁	19 m×46.5 m×10.2 m	1	约750	无
2	吊架	45 m×16 m×6 m	1	约120	无
3	钢丝绳	直径90 mm,长约53 m	8	约15	压制后成品破断力不小于4.7 MN
4	环形吊带	安全负荷65 t×3 m	24	约4.8	周长为6 m
5	卸扣	安全负荷85 t	36	3.2	弓形卸扣
6	卸扣	安全负荷200 t	20	5	弓形卸扣
7	卸扣	安全负荷200 t	4	1	直形卸扣
8	花篮螺栓	安全负荷65 t	4	约0.5	无

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