self-discharging sand dredger是什么意思

用法例句

10 Block Station of Jilin Oilfield, the construction method was adopted,in which the pipeline passes the river by floating and thepipeline sinks by a single suction dredge.

管道漂江前设置限位桩,利用浮筏等牵引设施完成漂管,当管道漂过江后用单吸式挖砂船将管道下沉,达到设计要求时采用固井车对套管进行注浆,至注浆终凝后完成管道穿越工作。