Joined: July 2004
||Posted: 29 Oct. 2019,12:41
The water-jet method is a bit hit-and-miss. I remember watching trials with the Gas Board 30-odd years ago in Blackpool and they had no control compared with the accuracy that was being achieved with the pneumatic mole....and that was in fairly simple soils!
A clever 'trick' for just this sort of problem is to cut an accurate trench, say, for arguments sake, 250mm in width, right across the ex. blacktop, drop in a duct, thread through your cable and a draw rope, and then backfill with lean-mix concrete.
When you get to the surface, top it off with a particular block paver that is, as luck would have it, 240mm in width, and the whole job looks like a deliberate decorative band across the surfacing rather than an awkward imperfectly reinstated trench! †
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