Re: Fence posts in sand

Posted by Jon C -Florida on September 07, 2004 at 16:34:22 from (66.209.40.195):

In Reply to: Fence posts in sand posted by Mark - IN. on September 07, 2004 at 16:08:54:

Mark -
Assuming you have fine sand , one way of getting piles set in Florida is to "jet" them. We take a gas engine driven pump, and using about a 3/4" p.v.c. wand, about 6 to 8 feet long, use water under pressure to sink the pile.

The wand is just clamped to the discharge line of the pump, and standing the pile/post up where you want it (remove the top soil), you blast around the base of it, displacing the sand. The pile will drop into the displaced "quick" sand, as the sand slurry washes to the surface.

You control the depth with the pvc wand. Keep moving the wand, lifting and probing around the post. When set, just pack the sand slurry around the post and let the water drain down.

Your only problem will be a source of water. But assuming you have a water tank and a small (1-2 h.p.) pump, you can set a load of posts in a hurry.

We use it for dock building, and even the initial setting of bridge piles, before the driving process starts. I have "jetted" some rather large piles (telephone poles) by hand for docks and moorings that I built, and I have seen huge concrete piles jetted up to 20 feet deep with a crane and a much larger pump.

We generally only wet sand to avoid getting stuck in dry powder "sugar sand" down here, but just wetting usually does not work too well in a post hole without using the jetting process.

I have no idea if it will work up in your country...but if the sand is fine enough, you might want to give a try.

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