Pipe-and-cable-laying plough
Encyclopedia
A pipe-and-cable-laying plough is a trenchless method to bury cables or pipes.
The machinery is a form of a subsoiler
Subsoiler
A subsoiler or mole plough is a tractor mounted implement used to loosen and break up soil at depths below the level of a traditional disk harrow or rototiller. Most tractor mounted cultivation tools will break up and turn over surface soil to a depth of 6" to 8" while a subsoiler will break up...

 with a single blade. It is used to lay buried services of virtually any description, for drainage, water, electricity, telecommunications, gas supply etc.. A coil of the service pipe/cable is mounted on the tractor and is led down a guide behind the blade, and is left buried behind the plough, without the need to dig a deep trench and re-fill it. This process is normally used in rural areas where previously buried services will not be encountered and there are no hardened surfaces, e.g. tarmac concrete etc..
There are also specialised laying ploughs for cable laying behind traffic barriers, in stream or lake beds or even for the laying of submarine cables in deep sea, so-called sea ploughs. Sea ploughs are pulled behind cable ships and bury the cable in the sea bed. Burying submarine cables helps protect them from anchors, trawlers and other risks.
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