永冻土、季节性冻土、冻土沼泽地段长输管道大开挖施工

Large Excavation Construction for Long -distance Pipeline Trenching in Permafrost, Seasonal Frozen Soil or Frozen Swamp Areas

中俄原油管道漠河—大庆段穿过连续多年冻土区、不连续多年冻土区、岛状多年冻土区及季节性冻土区。为避免管道施工对周围环境的影响和冻土融化对管道的影响,需要在冬季进行施工。永冻土地段管沟开挖施工中采用液压单钩挖掘机松动表层冻土,单斗挖掘机配合清理;冻土沼泽地段采用分层开挖方法施工,大大提高了施工质量和施工进度。

Mohe-Daqing Section of China-Russia Crude Oil Pipeline passes through continuous permafrost zones,discontinuous permafrost zones,island permafrost zones and seasonal frozen zones.In order to avoid the effect of pipeline construction on ambient environment and the effect of frozen soil thawing on pipeline,it is necessary to do the pipeline construction in winter.When trenching in permafrost zone,the surface layer frozen soil is loosened by hydraulic single hook grab,then the soil is cleaned by single shovel grab;when trenching in frozen swamp zone,the layered excavation approach is applied,which greatly improves the construction quality and schedule reliability.