boring under a 20 ft driveway

[muddywater]

I couldnt do that with our clay rocky soils. Boring it is sometimes slow.
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[superintendent]

I found a place that rents a mole. He said there nothing to it, for yall that have use them how hard or tricky is it the first time around?

[cjohn2000]

Originally Posted by superintendent

I found a place that rents a mole. He said there nothing to it, for yall that have use them how hard or tricky is it the first time around?

Well trajectory angle is fairly important. A mole works on fiction as it goes through the soil. If the mole its a soft spot or a gravel deposit it could start "swimming" and get stuck.

[stebs]

Something i've heard about the moles is that you need to be at least a foot down for every inch in diameter the mole is... something to keep in mind...

[Sprinkus]

Here's an interesting technical report: Guidelines For Impact Moling

They're recommending a depth of ten times the diameter of the bore or 3-4 feet, whichever is greater.

[greenmonster304]

For my 3" missile I usually go 30" min. Page 12 http://www.tttechnologies.com/manual...t%20Manual.pdf
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[Mdirrigation]

Angle it about 3 or 4 degrees downward angle , dig down at least 2 1/2 feet . Place the missile across the drive and mark on the hose with duct tape so you KNOW its past the end of the drive. ( when you mark have the missile past the end of the drive ) as its going if it starts sounding louder or the driveway starts to crack reverse it right away . If it gets stuck plan on a day getting it out . Good luck

[Oxmow]

Try an Underwunder...portable boring machine, has maybe a 7 horse engine and gear reduction to drive drill pipe and bits. Can be used with or without water. Kinda looks like a pressure washer, but with a gear reduction and spring unit where the pump would be. May be at your local rental place.