Jack Tripp, CGCS said: That's what used bed knives are for. All you need is a u-bolt. Holes are already drilled for the u-bolt.
I have used bedknifes in the past and it has worked out well.
I have also used the Underhill anchors. I got them through Florida Irrigation. I would assume most golf irrigation supply houses can get them. I also just search R&R Products and they offer something similar for $26.25/each.