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#14062 - 01/29/10 10:08 AM pipe burst under slab
barkparkbarb2010 Offline
Junior Member

Registered: 01/29/10
Posts: 2
Hi, new to this forum.

Question about a hot water pipe burst under a concrete slab floor in a small commercial building. The hot water supply pipe that services three sinks in the building is imbedded into the slab about 2 - 3 inches below the floor's top surface. There is no floor covering over the concrete.

Water escaped from the line through a breach in the pipe for at least a month before being discovered, and now there is a crack in the floor. A void is suspected under the slab caused by the water pressure scocuring out the sand that was laid and compacted at the time the stucture was built. The void that we suspect exists is approximately in the middle of the slab, roughly 10 to 12 feet in from the front of the slab. there is a new crack in the surface of the slab in the area where the void is suspected.

Slabjacking or pressure grouting is being considered to fill the suspected void but there is an argument by the insurance adjuster that the concrete (20 yrs old) is rigid and not subject to deflection down into the void. Can concrete "sag"? The crack is relatively small in width, but about 3 or 4 feet long running parallel to the pipe, not sure if it's directly over the pipe since no destructive exploration has been done. I suspect the crack is wider as it goes vertically deeper inside the slab and that the crack's top edges are pinching against each other keeping the slab generally intact. Is there any flexibility in cured concrete that would account for the slab's continued soundness? Need technical info on the properties of cured concrete. Happy to do research, but not sure where to start. Thanks very much.

#14087 - 02/13/10 11:47 AM Re: pipe burst under slab [Re: barkparkbarb2010]
PatMkcr Offline
Junior Member

Registered: 02/10/10
Posts: 8
Metal under concrete is never a good idea because of deterioration. I'd just run new lines from the ceiling down.

#14314 - 05/12/10 12:00 AM Re: pipe burst under slab [Re: PatMkcr]
asilians Offline
Junior Member

Registered: 04/08/10
Posts: 6
shot the pipe and run new line from somewhere, epoxy cement can help....

#14848 - 09/03/13 02:27 PM Re: pipe burst under slab [Re: asilians]
ryanzwti Offline
Junior Member

Registered: 09/03/13
Posts: 2
If there is a void forming underneath your business I'd recommend seeking out someone to perform mudjacking or polyjacking. It would help to prevent further slab cracks.

some information

#14994 - 09/28/13 08:05 AM Re: pipe burst under slab [Re: ryanzwti]
Darren4546 Offline
Junior Member

Registered: 09/28/13
Posts: 3
Well dude!Metal concrete is a good way and better idea So you can use it especially for that purpose.So what do you say about it buddy??????????????:):)

Edited by Darren4546 (09/28/13 08:08 AM)