HDD is often the preferred method for constructing the pipeline across such obstacles as streams or wetlands. (See inset diagram.) Here is shown a typical river crossing.
水平定向钻孔(HDD)常常是管道穿越河流或湿地这类障碍优先选用的方法。插图表示河流穿越的典型情况。
The pipeline construction in west China gas transported to east China project needs pipeline crossing the Yangtze river at Sanjiangkou port.
根据三江口地质、环境特点，决定盾构施工法为西气东输管道通过长江的推荐方案。
West Pipeline crossing Heihe River is the longest crossing project by a large excavation way and the method of laying both crude oil pipeline and products pipeline in a single trench.
黑河是西部管道工程采用大开挖方式穿越的距离最长的河流，原油与成品油管道采用同沟敷设方式穿越该河流。
From the viewpoint of hydrology, hydrolics and geology, the paper deals with the factors worth consideration in pipeline river-crossing design and the principle of design.
本文从河流学、水文学、水力学和地质学的观点，介绍管道穿越河流的设计中需要考虑的因素和设计准则。
Structure optimization and reliability analysis of truss river-crossing related to the overall performance of pipeline structures. And it plays an important part in structure's safe operation.
桁架式跨河管架的结构优化和其可靠度分析，关系到管架的整体性能，对管道的安全运行有着重要的作用。
Tunnel is a low cost way for crossing river pipeline projects in long-distance, but crossing river cracks are main difficulties in karst areas.
隧道是长输管道工程中一种成本较低的穿跨越形式，但对于岩溶发达地区的大型河流，通江裂缝等地质条件是其主要施工难点。
Tunnel is a low cost way for crossing river pipeline projects in long-distance, but crossing river cracks are main difficulties in karst areas.
隧道是长输管道工程中一种成本较低的穿跨越形式，但对于岩溶发达地区的大型河流，通江裂缝等地质条件是其主要施工难点。
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