论文部分内容阅读
穿越天然河流的管道,在运行中遭到破坏,大多数是因为管道在河床中埋深不够,洪水期被冲刷,裸露悬空,受动水浮力和推力的作用,使管壁产生危险的弯曲应力所造成的。据国外资料统计,由于管道埋深不够,而被水流冲刷悬空导致断管事故次数,大约占穿河管道事故总数的71.7%(未包括管线被冲刷裸露后,因船锚、木筏和冰块等造成的机械损坏)。我国在长江、黄河、嘉陵江上敷设的原油、天然气管道也曾因冲
Pipelines that run through natural rivers are destroyed in operation, mostly because of inadequate depth of pipe in the riverbed, erosion during flood periods, exposure to dives, buoyancy and thrust induced by moving water, creating dangerous bending stresses on the pipe wall Caused by According to statistics from abroad, due to inadequate depth of pipelines, the number of pipe breakage accidents resulting from the scouring caused by water scouring accounts for about 71.7% of the total number of canal pipelines (excluding the exposed pipelines, the anchors, rafts and ice cubes Etc. caused by mechanical damage). China’s crude oil and natural gas pipelines laid on the Yangtze River, Yellow River and Jialing River have also been washed away