Abstract
The extending of a cantilever and transverse moving of a drilling floor enable the jack-up to operate in several well positions after the Jack-up has pitched. The cantilever allowable load nephogram is the critical reference which can evaluate the jack-up’s drilling ability, design the cantilever structure and instruct a jack-up manager to make the operations safe. The intent of this paper is to explore the interrelationships between the cantilever position, drilling floor and the loads including wind force, the stand set-back weight etc., through analyzing the structure and load characteristics of the x-type cantilever and the simplified mechanics model with the restriction of the maximum moment capacity of the cantilever single side beam. Referring to several typical position designs load values, the cantilever allowable load nephogram is obtained by using the suitable interpolation method. The paper gives a method for cantilever allowable load design, which is proved reliable and effective by the calculation example.
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Chengmeng Sun was born in 1979. He was awarded his PhD in Dalian University of Technology in 2009. He is a offshore engineer of China National Petroleum Corporation (CNPC) Bohai Equipment Manufacturing Co., Ltd. Offshore Engineering Equipment Research Institute. His current research interests include the performance analysis of ship and offshore engineering.
Hongde Qin was born in 1976. He has been a professor at Harbin Engineering University since 2012. He is a ISSC member in IV.1 committee and ITTC observer. His research covers a wide range of problems in offshore engineering such as interaction between floating body and waves, hydrodynamics of aquaculture structures in waves and currents.
Bin Jiang was born in 1963, He received the Master’s degree in Ocean and Ship Engineering from Tianjin University in 1991. He has been a professor and doctoral supervisor at Harbin Engineering University. His research covers a wide range of problems in naval architecture and offshore engineering, such as vibration and noise control.
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Zhu, Y., Sun, C., Qin, H. et al. Study on the design method of the jack-up’s x-type cantilever allowable load nephogram. J. Marine. Sci. Appl. 13, 315–320 (2014). https://doi.org/10.1007/s11804-014-1262-x
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DOI: https://doi.org/10.1007/s11804-014-1262-x