I read that you can hook a PVC pipe to a garden hose then be able to pass that PVC pipe under a driveway. I have done that a few times and with the sandy soil in south Florida it does not take very long. In the past I have done that only with small diameter pipes 1/2" used for sprinkler lines under driveways about 6' wide or so. The fact that it's a sprinkler pipe under pressure also makes it easier because I am not so concerned about the slope of the pipe or whether there is a belly in between or not.
Now, the problem is more complicated. I want to pass a 2" PVC pipe under the floor slab from a bathroom where the slab is already cut open, 15 feet across to the location of a future kitchen island.
The fact that it is a 2" pipe makes it more complicated. The fact that it has to be sloped property being a gravity drain pipe also makes it more complicated, and lastly, since the opening in the bath is along about 4' long, I have to feed 4' of pipe in each time, gluing a new coupling.
I did this by gluing a 2" cap over the end of the pipe, then drilled a few small openings, on the other end I glue in a 2" to 3/4" reducer, then a 3/4" MIP to 5/8" adapter, then the garden hose. When water is turned on, it fills the pipe then I started to push the pipe in. I did this and it was able to get about 6 feet in and then stopped. Does not matter what I do it will not advance.
Finally I decided to measure where the end of this 6' in and cut a small opening in the slab and dug down, and guess what I found, a single piece of coral rock within the sand blocking the path...the rock is small, about the size of a computer mouse. I dug it out and now I am ready to continue.
But before I continue, I am wondering if I may run into additional rocks in the 9' ahead of it, and if I do, I don't want to cut an opening in the slab every time it is stuck. Because I am using a 2" pipe with a 2" cap, the pressure of the water coming out of the front is fairly low. I am wondering if I should cut that cap off and glue in a reducer from 2" to say 3/4", and close with a cap and drill a real small hole at the end say 1/4" in size.
I am thinking being a smaller hole with a smaller diameter pipe in front would give it a higher pressure jet in the front that may have a better chance of dislodging any rocks should I run into any again. But I am not sure if making it easier for a smaller 3/4" section in the front to go through would necessarily be enough to get the bigger 2" that follows.
So the question is should I stay with the 2" cap with three nozzles or fit in a small section of 3/4" with a smaller nozzle. I can access the front of it from the hole I cut, but once I pushed forward and glue in more pipe from the tail end it will be impossible to change the head.
Thanks in advance,