长距离大直径过江定向钻进钢管案例分析  

Analysis of Long-distance Large-diameter Directional Drilling Steel Pipes across River

作　　者：孙安 杨磊三[1] 李易 史慧婷[2] SUN An;YANG Leisan;LI Yi;SHI Huiting

机构地区：[1]广东省建筑设计研究院集团股份有限公司,广东广州510010 [2]广州市城市规划勘测设计研究院有限公司,广东广州510060

出　　处：《城市道桥与防洪》2024年第12期185-188,M0016,M0017,共6页Urban Roads Bridges & Flood Control

摘　　要：以广州南沙区某DN1200给水管道工程为例,分析在穿越长距离河道时会遇到的难题,通过多方面综合对比最终确定采取定向钻进方案。结合工程实例,通过精确双导向系统控制管道的空间定位,提前准备降速降压再清孔以应对导向孔失控跑浆,配备专用工具以应对预扩孔卡钻包钻,调整泥浆配比和泥浆压力以预防孔洞塌孔、泥浆冒浆等难题;针对回拖过程中管道净浮力较大的问题,采用内充水方式进行配重抗浮;通过计算确定管道的最小壁厚,确保管道在回拖过程中不发生拉脱破坏;采用合理的回拖钻具和相关措施,确保管道回拖过程顺利。管道现已顺利竣工且试运行良好,可为类似工程提供有益参考。Taking a DN1200 water supply pipeline project in Nansha District,Guangzhou as an example,the difficulties encountered when crossing long-distance river channels are analyzed.The directional drilling scheme is finally determined through the comprehensive comparison from multiple aspects.combined with the engineering practice,the precise dual guidance system is used to control the spatial positioning of the pipeline,the speed reduction and pressure reduction are prepared in advance,and then the holes are cleaned to deal with the uncontrolled mud leakage in the guide hole.The special tools are equipped to deal with the jamming and drilling package of pre-expansion hole.The mud ratio and mud pressure are adjusted to prevent the difficulties such as hole collapse and mud overflow.Aiming at the problem of large net buoyancy of the pipeline during the back dragging process,an internal water filling method is adopted for counterweight anti-floating.The minimum wall thickness of the pipeline is determined through calculation to ensure that the pipeline does not experience the detachment and damage during the back dragging process.The reasonable back-dragging drilling tools and related measures are taken to ensure the smooth process of pipeline dragging back.The pipeline has been successfully completed with the good trial operation,which can provide the useful reference for similar projects.

关 键 词：长距离定向钻进 泥浆配比 回拖 充水配重 壁厚计算 

分 类 号：TU43[建筑科学—岩土工程]