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Old 09-02-2006, 02:26 PM
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Default DIY jetting in dock pilings?

ok, we have a small lake out back and want to put in a small dock (so the kids can fish off of and so i can pull the jon boat up on) maybe 6'X12'. we have very little level change in water and also no current or waves. im hearing people telling me to "jet" the 6x6 posts in vs. pounding them in with a mini sledge hammer. I believe i can use a garden hose for this from what i hear but not sure of the exact set up. anyone got any ideas, pictures, links for the DIY'er? also the bottom is basicly sand/muddy type and you sink almost to your knees immediatly once you get in. thanks everyone!
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Old 09-02-2006, 03:03 PM
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Default RE: DIY jetting in dock pilings?

exjay,
yes you can use your garden hose if you have good pressure and flow. You need to get yourself either 3/4" or 1" pvc pipe - at least a 10' stick, more depending the water depth at the deepest part - you need to be able to get through all that soft mud and into some solid sand or clay/etc that you have in your lake. you should get at least 3-5' into that solid bottom so it will hold onto your pilings. anyways, take your long piece of pvc and put a 90 degree on one end and a short piece of same size pvc and then stick a garden hase adapter to that. then you can just screw your garden haose to that. on the other end of the long pvc stick if you have a hard pan bottom that you need to punch through, you can cut some teeth into the pvc to help you eat through the hard bottom. when you have it figured out where the piling goes, have it ready nearby and turn your garden hose on. then stand up the pvc and start jetting into the bottom until you have sufficient depth.

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Old 09-02-2006, 03:19 PM
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Default Re: DIY jetting in dock pilings?

The pvc pipe is a good idea; but. I just tie-wrap a garden hose to a boat brush handle. I have one of those brass jet heads for the end of the hose. The biggest I have seen people make is to just tie-wrap the hose to the 6X6. First drill the hole. That will just liquify the sand/mud. Next tie-wrap the hose to the 6X6 with the nozzle at the bottom, duh! Just watch out she does not drop out of sight.
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Old 09-02-2006, 03:30 PM
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Default Re: DIY jetting in dock pilings?

I've never used a garden hose, although I've heard it can be done, because I always use a water pump that I rented at Home Depot. Costs a few bucks but really pumps the water out - much, much harder than a garden hose. I have no qualms about jetting in a 10' piling 5' into the bottom.
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Old 09-02-2006, 05:38 PM
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Default Re: DIY jetting in dock pilings?

With loose mud and small timbers you can use a "Garden hose", but we use 2" to 3" trash pumps with 2" PVC pipe to jet in with. That makes it much faster and easier to get the timbers down into solid material (like clay). You want the "pilings" to give adequate support, but not sink further. Be sure and use treated lumber. There are various degrees of treatment.

There is another way--and that is to use PVC pipe. For that, I would use 4" PVC sewer pipe (cheap)--and put a 3/4" pvc pipe in the center. Make an "arrow head" which goes out beyond the 4" pipe with a hole in the center
For the 3/4" pipe. Use electical ties to hold this together, put in a small amount of concrete to begin with to "cement" this together. Put a couple of pieces of Rebar into the larger pipe. and as you jet it in, slowly put in some concrete. When you have it at the correct level, then drill holes for the stringer bolts, cut off the 4" pipe or terminate it at the proper level. You now have a reinforced concrete piling, stronger than wood, and which will last many times longer. This is being done in a number of latin American countries and is very strong and cheap. Plus, the 3/4" hose works with this.
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Old 09-03-2006, 06:46 AM
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Default Re: DIY jetting in dock pilings?

Quote:
thataway - 9/2/2006 5:38 PM

With loose mud and small timbers you can use a "Garden hose", but we use 2" to 3" trash pumps with 2" PVC pipe to jet in with. That makes it much faster and easier to get the timbers down into solid material (like clay). You want the "pilings" to give adequate support, but not sink further. Be sure and use treated lumber. There are various degrees of treatment.

There is another way--and that is to use PVC pipe. For that, I would use 4" PVC sewer pipe (cheap)--and put a 3/4" pvc pipe in the center. Make an "arrow head" which goes out beyond the 4" pipe with a hole in the center
For the 3/4" pipe. Use electical ties to hold this together, put in a small amount of concrete to begin with to "cement" this together. Put a couple of pieces of Rebar into the larger pipe. and as you jet it in, slowly put in some concrete. When you have it at the correct level, then drill holes for the stringer bolts, cut off the 4" pipe or terminate it at the proper level. You now have a reinforced concrete piling, stronger than wood, and which will last many times longer. This is being done in a number of latin American countries and is very strong and cheap. Plus, the 3/4" hose works with this.
I would like to see a picture of that set up that you use.Like the idea of concrete.
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Old 09-03-2006, 06:58 AM
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Default Re: DIY jetting in dock pilings?

For small docks the garden hose with enough pressure will pobably work. However, my neighbor, just put in a two lift boat house and first he tried to use the pump and it worked somewhat but finally had to hire a crane with a pile driver of sorts to get them in far enough. Bottom line is, it will just depend on what is the composition of the lake shore where you want to put the dock in.
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Old 09-03-2006, 09:38 AM
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Default Re: DIY jetting in dock pilings?

Quote:
29 NORTH - 9/3/2006 6:58 AM

For small docks the garden hose with enough pressure will pobably work. However, my neighbor, just put in a two lift boat house and first he tried to use the pump and it worked somewhat but finally had to hire a crane with a pile driver of sorts to get them in far enough. Bottom line is, it will just depend on what is the composition of the lake shore where you want to put the dock in.
I would NEVER recommend that a homeowner attempt to install boat lift pilings - way too difficult and dangerous. Those pilings have to be about 20' high and weigh several hundred pounds. Now, installing a dock piling, that is a different story...

As for the concrete, my neighbor did that and the rebar rusted and caused the concrete to crack.
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Old 09-03-2006, 05:17 PM
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Default Re: DIY jetting in dock pilings?

I sould see rusting out in saltwater in no time,hows about for fresh water?I wanting to install some in my pond,just don't want to put posts that have chemincals in my pond.Or been thinking about a floating deck/dock.
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Old 09-03-2006, 09:17 PM
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Default Re: DIY jetting in dock pilings?

If you put the rebar in the center, it is protected by the concrete. That is the way the concrete pilings are built on the ICW bridges. Yes, so which are 50 years old are now having some problems....But with the PVC pipe, the PVC is another layer of protection.

Sorry I don't have any photos of the PVC technique.

Agree if you are putting in large pilings you need a A frame with winch to set the pilings with. These 8 to 10" pilings are very heavy--We have set some 30 footers and it takes at least 3 strong people plus the winches and 2 to 3" pumps. Setting boat lift pilings also have to be precise. Unfortunately many pilings will drift as you jet them in. This is one of the beauties of the jet pipe in the center--it pushes the sand/mud out equally and the pilings go in straight.
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Old 09-04-2006, 08:48 AM
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Default RE: DIY jetting in dock pilings?

I've used the jetting technique for pipes only. I'm sure it will help with timbers too. Allow time for sediment to flow back around the legs for stability.

Using a "sweeper" nozzle will increase the water velocity. I attached one to a 10' piece of hose with a shut-off valve where it hooked onto the main hose.

Last winter I had a plumbing project and used the left-over sections to make up a sophisticated contraption from 1/2" pipe. I expected this to allow more room for the exhaust and cut down on stones jamming in the tube.

Good news/bad news... The dock belonged to some friends of mine who had this summer property on the market for a while. They found a buyer and we never put in the docks this year. Except for some holes in my yard, the doc-O-matic remains untested.

Good luck!
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