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Suspended Manhole

Suspended Manhole

Suspended Manhole

(OP)
Hello hi,

I encounter this issue in my project. Due to insufficient space, services such as manholes, grease traps etc will be inside the building which is on the ground floor. This building has basement also. Therefore, we need to construct the manholes to be suspended on the ground floor. So basically we need to provide deep beams to support this manhole?

However, client and architect do not like to have deep beams here. and another consultant propose to have steel manholes etc. Have this ever been done?

Thanks for your opinion.

RE: Suspended Manhole

Contact your local precast company. They may be able pour a custom structure that can be suspended as you need. That's going to be a difficult though, going to require some clever design work to ensure it works correctly. Most manhole details are setup to work when everything is in compression.

Professional Engineer (ME, NH, MA) Structural Engineer (IL)
American Concrete Industries
https://www.facebook.com/AmericanConcrete/

RE: Suspended Manhole

You could use a cast-in-place concrete box shape (vs. a circular manhole) and hand the box from more typical beams on either side of it.

I've done that with an elevator pit suspended from a cast-in-place concrete floor structure with a large crawlspace below...staying above expansive clay material below.

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