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-   -   "Floating" on Wet Concrete (http://www.diychatroom.com/f105/floating-wet-concrete-175237/)

DaveLeeNC 03-22-2013 04:01 PM

"Floating" on Wet Concrete
 
I am in the process of building a permanent telescope pier and the pier itself is now done. It is basically a 3' long, 8 inch steel pipe that stands vertically (welded) on a flat steel plate (1 foot square).

The pier will be J-bolted to the pier pad (concrete) and it would be handy to just set the pier/bolts on top of the wet concrete and let the pier itself kind of 'find its home' on top of the pier pad. The pier assembly weighs right at 100 pounds.

What is going to happen when I set this pier assembly on top of wet concrete (100 pounds spread over 1 sq. foot)? Is it going to sink down and down or will it pretty much 'sit on top'? The pier pad itself is basically a cube that is 2.5' x 2.5' x 2.5' (roughly). It will be around 3500 to 4000 psi concrete (and will contain a goodly number of brick sized rocks whose only purpose is to reduce the volume of concrete to be mixed).

Thanks.

dave

Canarywood1 03-22-2013 05:29 PM

You want to inbed just the jbolts in the wet concrete,if you try setting the whole thing on the wet concrete,it's going to sink to a certain degree,and may tip one way or the other.

You do have holes drilled into the steel plate,do you not??

DaveLeeNC 03-22-2013 05:38 PM

Quote:

Originally Posted by Canarywood1 (Post 1143240)
You want to inbed just the jbolts in the wet concrete,if you try setting the whole thing on the wet concrete,it's going to sink to a certain degree,and may tip one way or the other.

You do have holes drilled into the steel plate,do you not??

The holes are drilled in the plate (one in each corner). I can set the J bolts with a wood template. I just wasn't looking forward to trying to wrestle a 105 pound pier assembly around trying to line up four holes/hour J bolts.

dave

Mort 03-22-2013 05:40 PM

Just the bolts. If you wait until the concrete has set up enough so the pier won't sink, it won't be wet enough to consolidate around the bolts. And if you put it in there wet, it'll sink.

Just make a cardboard template and use that to locate the bolts.

TheEplumber 03-22-2013 05:42 PM

Can you use a plywood template of the base plate? Attach the J bolts to the plywood and wet set it when you pour the mud- remove the plywood after it cures then set the permanent plate.

TheEplumber 03-22-2013 05:44 PM

A little slow on my posting...
You could use expansion bolts too. Drill them in after the mud cures

GBrackins 03-22-2013 05:51 PM

couldn't you just drill the setup concrete and use epoxy to set your anchors (threaded rods not j-bolts).

Canarywood1 03-22-2013 06:00 PM

[QUOTE=DaveLeeNC;1143252]The holes are drilled in the plate (one in each corner). I can set the J bolts with a wood template. I just wasn't looking forward to trying to wrestle a 105 pound pier assembly around trying to line up four holes/hour J bolts.


Can you use a plywood template of the base plate? Attach the J bolts to the plywood and wet set it when you pour the mud- remove the plywood after it cures then set the permanent plate.


As eplumber said is the easiest way,just use a nut on the top and bottom of the j bolts,with the plywood in between.

DaveLeeNC 03-22-2013 06:21 PM

When all is said and done I guess it is a trade-off between wrestling a 105 pound pier assembly onto J bolts vs. a fair amount of drilling. Not being familiar with the using epoxy in concrete I'll probably go the J bolt/plywood template (wrestling) path.

dave

Msradell 03-22-2013 10:03 PM

One thing I've learned when doing work like this in industrial situations is to leave one bolt about 1 inch higher. You can catch this one 1st and use it for a pivot point to line up the other 3 (or many more in industrial situations). It makes it much easier to line everything up.


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