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Increasing attention has been focussed in the North Sea and elsewhere on the quantification of the risks of working in a hazardous enviroment: the offshore world. The perception of risk with respect to mobile rigs has often been vague and uninformed. This paper attempts to put the risks with respect to jackup rigs into perspective by quantifying them and comparing them to other risks.
This paper contains a few risk comparisons with fixed platforms, semi-submersibles, and drillships. Historical casualties are used in an example to show how a change intended to make an operation safer, may result in the opposite effect.
Examining risks from losses due to environmental overload, the conclusion is reached that jackups are very safe structures: there appears to be no jackup, in the timeframe examined, that has been lost because of a deficiency in the calculation methods currently in use by knowledgeable experts. 相似文献
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David B. Lorenz 《Marine Structures》1989,2(3-5):385-401
There are several important structural design parameters in the analysis of a mat type structure for a jackup mobile offshore drilling unit. These consist of dimensions for the mat, soil foundation types, and structural loads. Methods for determining the proper dimension of the mat structure, modeling the structure and its loading cases, modeling the soil conditions and a method for identifying critical load cases for each element and load case is presented. By using a database approach for the finite element output for all of the various loading cases, a rational approach is presented which solves the problem of sorting and analyzing all of the elements and load cases, ensuring that all are included and none of the critical cases are missed. 相似文献
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李洪庆 《城市轨道交通研究》2016,(8):62-66
以广州地铁某盾构隧道穿越桥梁时桩基托换工程为例,详细介绍了既有桥梁桩基托换施工方法、顶升工法、施工监测等技术应用情况,为在复杂施工环境和复杂地质条件下,进行既有桥梁桩基托换提供技术参考。 相似文献
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