伊宁—霍尔果斯输气管道工程萨尔布拉克河大开挖穿越施工技术

Big Excavation Technology of Saerbulake River Crossing in Yining-Khorgos Gas Pipeline Project

伊宁—霍尔果斯煤制气输气工程萨尔布拉克河穿越工程中管道穿越处主河道宽约700m,水面宽约40m,水深约0.30m,平均径流量为1.381×108 m3/a,最大冲刷深度为4.48m。管道穿越处河道的河床地层为粉沙层,地下水位高,施工难度比较大。采用围堰导流大开挖穿越施工方式成功实现了管道穿越,施工后保证了河道的畅通,没有造成水土流失,两岸及河道内生态环境未遭受破坏。

In the Yining-Khorgos gas pipeline project,the pipeline crossing Saerbulake river was about 700 re,of which the surface of water was 40 m. The depth of water was 0.3 m and the mean annual runoff of the river was 1.381×10^8 cubic meter. The limiting scour was 4.48 m. The river bed is of silty sand. The underground water level was high. Cofferdam diversion and big excavation were used in engineering to realize the pipeline crossing. After construction, the river was smooth,and did not cause soil erosion. The entironment in both river bank and water had suffered no damage.