中俄东线水平连续冷弯管管道沉管下沟的可行性  

Feasibility of lowering-in of horizontal continuous cold bending pipes in China–Russia Eastern Gas Pipeline

作　　者：刘玉卿[1] 武玉梁 张振永[1] LIU Yuqing;WU Yuliang;ZHANG Zhenyong(China Petroleum Pipeline Engineering Corporation)

机构地区：[1]中国石油天然气管道工程有限公司,065000

出　　处：《油气储运》2020年第2期215-221,共7页Oil & Gas Storage and Transportation

摘　　要：为了保证全自动焊机的通过性,实现全自动连续焊接作业,采用连续冷弯管替代热煨弯管以达到等效转向效果,将直管道和冷弯管在沟上焊接完成后进行整体沉管下沟作业。管道在沉管下沟过程中会经历高应力状态,尤其对于带有水平连续冷弯管的管道,整体沉管下沟过程中的应力状态更加复杂,尚无施工先例。采用有限元方法分析了带水平连续冷弯管管道双侧单向沉管下沟的基本规律,分析了水平连续冷弯管管道沉管下沟后残余应力存在的原因、分布情况及影响因素,提出了水平连续冷弯管管道沉管下沟的可行性评判标准,并将其应用于中俄东线天然气管道进行论证。研究结果表明:中俄东线1422 mm×21.4 mm、1422 mm×25.7 mm、1422 mm×30.8 mm管道规格的水平连续冷弯管管道整体沉管下沟的施工方案可行。In order to ensure the pass-through of the full-automatic welding machine and realize the full-automatic continuous welding operation,the continuous cold bending pipe was adopted to replace the hot bending pipe to achieve an equivalent turning result.The straight pipe and the cold bending pipe were welded above the trench,and the integral pipe lowering-in was carried out after the welding was completed.The pipeline will be subjected to high stress during pipe lowering-in process.Especially for the pipeline with horizontal continuous cold bending pipes,the stress state in the whole pipe lowering-in process is complicated,and there is no such construction precedent.The finite element analysis was used to analyze the basic law of the double-sided unidirectional lowering-in of the pipeline with horizontal continuous cold bending pipe.The causes,distribution and influencing factors of residual stress after pipe lowering-in of the horizontal continuous cold bending pipe were analyzed.The feasibility evaluation criteria for lowering-in of the horizontal continuous cold bending pipe was proposed and demonstrated.The research results show that the construction plan of the integral pipe lowering-in of the horizontal continuous cold bending pipe with 3 specifications(1422 mm×21.4 mm,1422 mm×25.7 mm and 1422 mm×30.8 mm)in China–Russia Eastern Gas Pipeline is feasible.

关 键 词：中俄东线 连续冷弯管 沉管下沟 有限元 可行性 

分 类 号：TE832[石油与天然气工程—油气储运工程]