On Monday 11 February 2013 16:36, John Lyons wrote:
concrete roadway, just packed earth and rock? Environmental limitations do
My best guess is that you would want to use directional boring in that case. A small hole every couple hundred meters, horizontal bore and duct pullback
You'll struggle to get a directional drill through material that includes rock.
It's two days work for this kit
Depends on the material, thru hard and broken rock is definitely do-able with a horizontal bore and pneumatic impact head: http://www.youtube.com/watch?v=Sbn7rgUvFuI http://www.youtube.com/watch?v=hbksxTJLgCc Horizontal boring can be done with/without drilling fluid and with/without active drilling heads, depending on the conditions. The op was rather vague on the actual requirements, so we are all left guessing... I took "packed earth and rock? Environmental limitations do not allow... underground ductbank" to mean mixed earth and no open trenching or methods that would potentially cut aquifer plains allowed. I.e. running this theoretical fiber thru a national forest, trenching 6ft down with a wheel or cable plow and cutting all the tree roots in the path would be bad... Adrian