一条长715m,φ820mm,重160t的输气管道从辽宁双开河西岸入土,经22m深的河床下在河东岸破土而出。这是我国目前首次采用水平定向钻穿越大口径管道。担任这一工程施工任务的是管道三公司,历时93h,创造了穿越导向孔、预扩孔一次成功、回拖一次成 A long 715m, φ820mm, heavy 160t gas pipeline dug into the soil from the west bank of the Shuangkaihe River in Liaoning Province. This is the first time that China has adopted horizontal directional drilling through large diameter pipelines. Served as the construction task of the pipeline three companies, which lasted 93h, created through the pilot hole, pre-reaming a success, back to drag once