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由于温度、土壤压实系数的差异以及管道基础沉降等所产生的各种外力作用,高压力、大口径天然气管道中间压气站的收发球筒和进出站截断阀在日常运行中容易出现位移。通过应力分析模型,选取应力分析参数,进行应力核算,并结合沿线各站场气象条件和地质情况,分析得出收发球筒和进出站截断阀发生位移的原因是:设计阶段应力分析计算选取的环境温度、土壤压实系数与施工过程中实际情况偏差较大,同时部分站场厂区埋地管道存在沉降现象也加大了管道的弯矩和所承受的应力。基于此,提出了有针对性的解决方案:采取支架与管道焊接和环氧砂浆灌浆料浇筑加固的治理措施,通过实施整改,取得了较好的效果,西气东输二线现场位移风险得到了控制。
Due to various external forces caused by temperature, soil compaction coefficient and settlement of pipeline foundation, the receiving and dispatching ball and inlet and outlet shut-off valves of high-pressure and large-diameter natural gas pipeline intermediate compressor stations are prone to displacement in daily operation. Through the stress analysis model, the stress analysis parameters are selected, the stress is calculated, and the meteorological conditions and geological conditions of each station along the line are analyzed. The reasons for the displacement of the receiving and dispatching ball and the ingress stop valve are analyzed as follows: Environmental temperature, soil compaction coefficient and the actual situation in the construction deviation is large, at the same time some of the station site plant buried pipe subsidence phenomenon also increased the pipe bending moment and the stress. Based on this, a targeted solution is put forward: adopting the measures of brazing and pipe welding and pouring reinforcement of epoxy mortar grouting material, and achieving good results through the implementation of rectification, and the risk of on-site displacement of the second West-East Gas Pipeline control.