摘要
为了提高MARK Ⅲ型LNG陆地储罐内罐围护系统划线施工的划线精度及划线效率,以达到提高生产效率、降低生产成本、保障生产质量的目的,对划线施工的方案和施工中出现的各项关键问题进行研究,并寻找对划线精度影响较大的关键问题,再结合现场情况及作业条件提出相应的解决方案,最终提出内罐划线关键区域的精度控制策略,进而优化施工方案。研究结果表明:①影响内罐划线精度的关键因素有:划线设备的作业距离以及在复杂环境下的作业精度、内罐底面和壁面交界处防潮层淤积影响、次层端部区域防潮层流挂影响、角区位置线平行关系及误差控制、内罐划线期间的精度检验方案、内罐平整度计算方案。②划线方案的部分优化方向有:将角区位置线提前标记,降低打磨混凝土造成的影响;简化移位标记点的定位流程。③影响划线精度的关键区域及针对关键区域的精度控制策略包括:底部中心点检验,通过多扇区轴线交汇点与设备确定的底部中心点对比检验;底部划线精度,采取三段式检验方案;壁面划线关键参数检验,通过壁面高度环线检验。结论认为,以国内最大的MARK Ⅲ型LNG陆地薄膜储罐也是近年来世界上在建的最大薄膜型陆地储罐为研究对象,研究结果对于国内乃至世界LNG陆地薄膜储罐的划线效率、精度提高和划线方案优化都有着重要的指导意义。
In order to improve the marking accuracy and efficiency of inner tank containment system of the MARKⅢLNG film tanks for purpose of increasing the production efficiency,reducing the production cost and ensuring the production quality,the problems existing in marking scheme and marking operation were investigated,and key factors that have great impact on marking accuracy were identified.Then,depending upon the site and operation conditions,proper solutions were proposed.Finally,the precision control measures for key marking zones were put forward,and the marketing operation scheme was optimized.The results show that key factors influencing the inner tank marking accuracy include marking device’operation distance and operation accuracy under complex environment,moisture barrier silting at the junction of bottom and wall of the inner tank,moisture barrier sagging at the end of sublayer,parallel relation and error control of corner position line,precision check scheme during inner tank marking,and inner tank flatness calculation scheme.The marking scheme can be optimized by,for example,marking the corner position line in advance to mitigate the impact of concrete grinding,and simplifying the locating process of displacement marked point.Different precision control measures are taken for key areas:(1)the bottom center point defined by the device is checked with the axial intersection of multiple sectors;(2)the bottom marking precision is checked by three segments;and(3)key parameters of wall marking are checked by wall height loop line.It is concluded that the research on MARKⅢLNG film tanks,the largest aboveground LNG film tanks in China and even the world,is of significant guidance to the marking efficiency and precision improvement and marking scheme optimization of LNG film tanks worldwide.
作者
孙剑
鲍星龙
SUN Jian;BAO Xinglong(School of Naval Architecture&Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang,Jiangsu 212100,China)
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2022年第12期117-124,共8页
Natural Gas Industry
