I would like to lay a lot of irrigation pipe in the orchard and pastures. Leaving them on top of the ground results in too much damage from the tractor, cows, and mowers.
I've been laying 1.5 inch pipe at my tree farm in what I call 'surface flush' I try to keep it just barely visible. In practice I have a black dotted line to remind me where it is. This way I can spot leaks, and the ice plugs thaw when the ground thaws.
What I've been doing is use a single chisel. The downside of this is that it makes a rough trench becuase it tears the sod.
I want to make a trencher for this using a couple of coulters from a 3 bottom plough ahead of the chisel. That way the edges would be neater.
For smaller line a pair of disks mounted so the front edges touch might just open up enough to stuff the pipe in.
Or run a furrow opener 2 inches down. I suspect that the sod might just flop back.
For a real trench, would it work to take something like 1/4 of a round of 36" diameter pipe. and bolt it onto a blade. You overlapp 6" onto the blade, then the bottom of the arc would be about a foot below the blade. First pass is about an inch down, to cut the sod in half. After that each pass takes about 2-3 inches. When it starts getting deep the blade spreads the spoils a bit. (Or you take off the blade if you want the spoils in windrows on either side.
Again, with this one it would do a neater job if you put coulters in front of it. Trouble is, that you either have to use big coulters, or you have to remove the coulters after the first couple passes. PITA.
A more general purpose solution would be to use something like a tool bar cultivator as the frame. Mount the scoop on a pair of the chisel/sweep mounting springs. Mount coulters the same way. (The TBC I have has two types of spring -- one with 2 turns which puts the chisel point in front of the bar, and one with 2.5 turns with chisels about 2 feet further back.)
With everything spring mounted the consequences of scooping the edge of a mother rock aren't quite as bone jarring.
Haven't *DONE* any of this. (except for the first thing) Just thinking out loud.