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Going under a driveway

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MiamiMan

Unregistered

1

Wednesday, May 25th 2011, 4:01pm

Going under a driveway

Hello all,

I have a half circle driveway that sections off a piece of the yard that I need to get to. I know about using a hose nozzle to bore under the driveway. My question is should I run the full size line under for three sprayers? I have 1-1/2" pipe. Can I run 1" instead? I'm thinking, the smaller the pipe the easier it will be.

Wet_Boots

Supreme Member

Posts: 4,102

Location: Metro NYC

2

Wednesday, May 25th 2011, 5:53pm

Concrete driveway?

MiamiMan

Unregistered

3

Wednesday, May 25th 2011, 8:54pm

Yes, concrete. Around 10' wide where I need to go under.

Mitchgo

Supreme Member

Posts: 502

Location: Seattle

4

Wednesday, May 25th 2011, 9:52pm

For a resi on a circle driveway. 1" is fine.

However I recommend to do a flow test on your largest consumption zone by using your water meter to get an idea of how much water the system can handle

Are you sure 3 heads will cut it?

It's best to have Head to Head coverage back to back - every sprinkler head spray touching the next spray side to side and front to back. This of course depends on the situation

mrfixit

Moderator

Posts: 1,510

Location: USA

5

Thursday, May 26th 2011, 4:19am

Wouldn't 3/4 inch work? It'd be a lot easier to get under the driveway.

I use about 4 feet of galvanized pipe attached to the nozzle then pvc there after. It keeps the pipe in a straight line. It comes out exactly where you aim it.

Good luck!

HooKooDooKu

Supreme Member

Posts: 683

6

Thursday, May 26th 2011, 8:58am

What kind of soil do you have? It can make the difference between this being an easy job, and a pain in the rear job. You can review the details of the pains I went through dealing with rock-filled clay here: Tunnel Under Driveway

The thing I found to be the relatively easy way to accomplish going under something was to construct a pilot hole with a piece of rebar and sledge hammer. Then I used 3/4" black pipe tipped with a bell reducer 3/4" to 1/2" transition) tipped with a nipple. I then hammered that along the pilot hole. The pilot hole also helps if you need to use a hose or pressure washer to power through.

Mitchgo

Supreme Member

Posts: 502

Location: Seattle

7

Friday, May 27th 2011, 12:14am

We just mole it over..

It's like an underground jackhammer.

MiamiMan

Unregistered

8

Sunday, May 29th 2011, 12:03pm

Quoted from "mrfixit"

Wouldn't 3/4 inch work? It'd be a lot easier to get under the driveway.
Can I reduce from 1-1/2" to 3/4" without problem? If so, I'll do that.

Mitchgo

Supreme Member

Posts: 502

Location: Seattle

9

Sunday, May 29th 2011, 1:24pm

Sure you can

As long as you design it properly

HooKooDooKu

Supreme Member

Posts: 683

10

Sunday, May 29th 2011, 10:10pm

I don't see any reason why you would want to constrict yourself to 3/4". If you can make a hole big enough to slide a 3/4" piece of pipe through, then you can make the hole bigger to accept a larger pipe. Just use some black pipe and black pipe fitting (along with a sledge hammer) and make the hole bigger. The bell shape of 1/2" to 3/4" with a nipple on the front of it makes for a pretty good arrow point to force through the hole. From experience, I know that a black pipe 3/4" fitting is perfect for 1" copper pipe.
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