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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. 相似文献
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沉箱是大型重力式码头中采用较多的结构,随着码头日益大型化、深水化,沉箱重量也是随之不断增大,大型沉箱的预制、顶升、移运及安装成为了制约重力式码头施工的系列关键技术。传统气囊顶升工艺受气囊性能和顶升工艺局限,适用范围受到很大限制,本文结合日照港岚山港区北作业区6#大宗散货泊位工程,研发了超高压气囊异步顶升、销孔法移运等新施工技术,为今后超大型结构的顶升和移运施工提供一种新思路。 相似文献
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The jack-up unit is one of the best drilling platforms in offshore oil fields with water depth shallower than 150 meters.As the most pivotal component of the jack-up unit,the leg system can directly affect the global performance of a jack-up unit.Investigation shows that there are three kinds of leg structure forms in the world now:the reverse K,X,and mixing types.In order to clarify the advantage and defects of each one,as well as their effect on the global performance of the jack-up unit,this paper commenced to study performance targets of a deepwater jack-up unit with different leg systems(X type,reverse K type,and mixing type).In this paper a typical leg scantling dimension and identical external loads were selected,detailed finite element snalysis(FEA) models were built to simulate the jack-up unit’s structural behavior,and the multi-point constraint(MPC) element together with the spring element was used to deal with the boundary condition.Finally,the above problems were solved by comparative analysis of their main performance targets(including ultimate static strength,dynamic response,and weight). 相似文献
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自升式钻井平台桩靴裂纹分析、处理及修复研究 总被引:1,自引:1,他引:0
桩靴是自升式平台的重要组成部分,主要作用是支撑整个平台,将平台所受的载荷传递到海床.一旦桩靴失效,将导致桩腿下沉,平台无法保持水平.文章利用有限元方法研究了自升式平台桩靴在出现裂纹后的应力水平,并研究相关的应对措施与修复方法. 相似文献
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A.A. Denton 《Marine Structures》1989,2(3-5):213-231
The events leading up to the capsize and total loss of a jack-up under tow are briefly summarised. The investigation of the causes of this are described in some detail. It involved model tests, finite element analysis, stability calculations, a determination of motions by analysis of newsreel videos taken at the time and close examination of an underwater film taken of the wreckage.
The likely sequence of structural failures leading up to the capsize is established. These are summarised and the lessons learnt from the enquiry highlighted. 相似文献
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同步顶升技术在旧桥改造工程中的应用 总被引:4,自引:1,他引:4
在天津市海河综合开发起步工程基础设施建设中,为满足旧有桥梁通航净空的要求,成功地应用了同步顶升技术。该文在顶升施工完成后,分析了同步顶升技术在桥梁顶升工程中的应用原理及顶升过程中的一些关键问题,对此项技术在同类工程中的应用有较高的参考价值。 相似文献
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张伟明 《广东交通职业技术学院学报》2009,8(3):35-38
文章主要介绍了茂湛高速公路匝道桥桥梁体第一联和第二联绕固定支座发生了偏转,且固定支座所在墩柱均出现了环向裂缝,通过病害原因分析评价,采用桥梁梁体顶升、平移复位的方法进行维修。 相似文献