"Eric" wrote in message
news:l15Wc.167449$8_6.1934@attbi_s04...
Foes anyone have any experience trying to hammer a piece of capped
galvanized pipe under a concrete driveway? I'm wondering how far
this will work. I'd like to extend my sprinkler system to the area
on the other side of my driveway. Probably a 3/4 inch pipe will do.
Thanks
Eric


My experience has been driving 1 1/4" pipe vertically but the problem was
always the joints - which you might not need. But if you do, they make
special drive couplings for the bigger pipe - if they make them for small
pipe I would recommend using them. And keep turning the pipe in a tightening
direction.