Sprinkler Supply Line Below a Footing 2

[dcarr82775]

During a recent plan review the City said that the fire sprinkler supply line for the building is not permitted to pass below the footings for the building. Due to the layout of the site the sprinkler supply line will enter below the basement slab, and the building has a basement wall around the full perimeter.

I get the idea behind it, but I think it is a silly requirement. Anyway, I was thinking about just putting in a short piece of void form directly over the pipe. Has anyone else run into this? What did you do?

 

[msquared48]

I normally sleeve the foundation wall and run the pipe through the sleeve.

Mike McCann
MMC Engineering

http://mmcengineering.tripod.com

 

[dcarr82775]

That was my suggestion, but for some reason the Mech Engineer says it can not be raised.

 

[msquared48]

Then locally extend the stem wall of the foundation down so that it can be sleeved through the stem wall, and the footing is below the pipe.

Is the pipe below the frost line?

Mike McCann
MMC Engineering

http://mmcengineering.tripod.com

 

[gasma1975]

See my suggestion (drawing attached)

 

[chicopee]

Tell us the reason the Mechanical Engineer said it could not be done.

 

[dcarr82775]

Mech Eng didn't give a reason and time is short so I don't really have the inclination to argue with him on why the pipe can't move. It is currently 24" below the footing so I was hoping to avoid stepping it down, but I guess will step it down since the consensus seems to be sleeve it through the wall.

 

[crackerjack74]

Add 3 #6 top & bottom 10'-0" long over the pipe and the footing will "span" over the pipe. If it even needs to...

 

[TXStructural]

crackerjack has the right idea. The footing can be "sleeved" through the soil by bridging the foundation above the pipe. Voiding the space above the pipe under the footing will work until the voiding material deteriorates, which should serve the intended purpose. I would avoid sleeving through concrete buried on both sides. Doing this can allow soil to pack into the void between pipe and concrete, removing any room for movement as the soil and building move.

 

[dicksewerrat]

Tell the ME to stuff it. Raise the pipe, starting 10 ft from the wall. 2 45 degree bends. And sleeve the wall.

Richard A. Cornelius, P.E.

http://WWW.amlinereast.com

 

[msquared48]

I like your attitude Dick...

Mike McCann
MMC Engineering

http://mmcengineering.tripod.com

 

[dicksewerrat]

It is so easy to be bullheaded and easier to offset a pipe.. What would the ME do if he wanted a straight pipe and the local authority told him not to cut down the tree in his wa, and the do that all the time.

Richard A. Cornelius, P.E.

http://WWW.amlinereast.com