When laying pipelines under road, railway, river and other obstructions, conventional drenched pipe burying method is hard in construction.

在公路、铁路、河流及其它障碍物下敷设地下管道时，采用常规的挖沟埋管法施工难度较大。

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Note: 1. The laying method in correspondence with D category in the table 1-18(GB/T16895.15-2002), which is suitable for the direct cable burying or cable layout in the underground conduit.

注： 1。敷设方式对应于表1-18（GB/T16895.15-2002）中的D类，适用于电缆直接埋地或电缆敷设在地下的管道内。

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Five initial proposals include laying cables under the sea to Deeside or burying power lines from Anglesey.

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Though the tubing laid on top of the trees during the test run, more permanent pipelines can be installed by laying a tube along roads or rivers, digging a trench, and burying it.

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