R409 + pipeline trench through the roof and installation of roof rain.
R 409 +管道穿屋面及地沟顶板防雨装置。
How to make the backfilled soil of pipeline trench stabilized in an effective manner is a major concern for the normal operation of pipeline.
如何采取有效的手段保持管沟回填土，是涉及管道正常运营的大问题。
Beijing Fuxing the pipeline Equipment co., Ltd. is a professional production and sale of the pipe trench integrated companies.
北京金福星管道设备有限公司是一家专业生产、销售沟槽管件的综合性公司。
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。
Once ready, the pipeline is carefully placed in the pre-dug trench or bored under waterways or roads.
一旦准备好，管道就可放入事先开挖好的沟槽或穿越排水沟或道路。
Once ready, the pipeline is carefully placed in the pre-dug trench or bored under waterways or roads.
一旦准备好，管道就可放入事先开挖好的沟槽或穿越排水沟或道路。
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