When we were planning our new system we had a perfect area for the 900 feet of pipe we needed to bury eight feet in the ground. It was a flat lightly forested area just 100 feet from the house and had a clear shot across our land. Getting the pipe in the ground without tearing up our soil and woodland was an issue. Jeff, our installer suggested a ground piercing technique he had heard of, usually used for utilities going under existing roads.
The ground piercing worked great. It involved only a small pit where the five-pair runs of underground piping was connected to the main two heat pump lines to the house and 5 four inch holes where the initial runs popped up in the woods. (This is where the pipe is then pulled into the ground to depth.)
The piercing controls exact placement of the pipe. A radio transceiver guides and steers the piercing tip underground to within inches of the target. We had the house run com up through the basement floor right on target. We had an option of running the pipes much deeper than trenching would allow and with the articulated tip the piercing was guided around trees and followed the topography. I flagged the runs topside with stakes so we will have a way to put them on our basemap later. The pipe has a 100 year life and twenty year warranty.
BTW, this new heatpump system replaces a 6 year old oil furnace the previous owner installed.
It was a wallet killer last winter and now sits in the barn with three 55 gallon drums of heating fuel waiting for a new life. Fat chance.
At left are the manifolds that connect the underground runs to the main lines. They are about ten feet down in the only pit we had to dig.
The pipes at right connect to the heatpump in the house. This is where the piercing ends. No trenches, no soil damage, very neat and in at least a quarter the time. We minimized the soil disruption to a small area that will soon be a garden. I will show our solar-ready ground source heat pump system in a later blog.