旋挖钻在海底管道沟槽疏浚工程中的应用

Application of rotary drilling rig in subsea pipeline trench dredging project

为解决东非某港新建离岸式油码头工程中海底管道沟槽开挖遇到硬岩层问题,进行了凿岩棒凿岩、反铲挖掘、水下炸礁等常规工艺的研究和比较,采用旋挖钻机辅助抓斗挖泥船进行硬岩挖除的处理方案,不需调遣绞吸船等专业船舶。结果表明:旋挖钻引孔后的硬岩层抓斗挖泥船可以顺利抓挖,工效及成本得到很好控制,可为类似工程提供参考。

During the subsea pipeline trench dredging for the newly-built offshore oil terminal at a port in East Africa,the hard rock layer is encountered.To solve this problem,this paper studies and contrasts the conventional processes such as rock hammer breaking,backhoe excavating,and underwater reef blasting.We apply a rotary drilling rig to assist the grab dredger in hard rock layer dredging,which does not need to deploy professional ships such as the cutter-suction dredger.The results show that the grab dredger can smoothly dredge the hard rock layer after the operation of the rotary drilling rig,and the working efficiency and cost are well controlled.The research can serve as a reference for similar projects.