×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Sprinkler Supply Line Below a Footing
2

Sprinkler Supply Line Below a Footing

Sprinkler Supply Line Below a Footing

(OP)
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?

RE: Sprinkler Supply Line Below a Footing

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

Mike McCann
MMC Engineering
http://mmcengineering.tripod.com

RE: Sprinkler Supply Line Below a Footing

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

RE: Sprinkler Supply Line Below a Footing

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

RE: Sprinkler Supply Line Below a Footing

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

RE: Sprinkler Supply Line Below a Footing

(OP)
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.

RE: Sprinkler Supply Line Below a Footing

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

RE: Sprinkler Supply Line Below a Footing

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.

RE: Sprinkler Supply Line Below a Footing

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.
WWW.amlinereast.com

RE: Sprinkler Supply Line Below a Footing

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.
WWW.amlinereast.com

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources