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Re: Traction Elevators

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On a recent job, we specified machine beams (based on elevator consultant recommendations) in our elevator machine rooms. When bids came in, Otis was the low bidder, but wanted to use a concrete slab without machine beams. I'm not sure what the difference in cost is, but the owner paid us to revise all of the elevator machine rooms (about 6 or 7 on the job). Otis will provide you with design criteria, also, apparently based on the elevator code requirements.

Eric Ober

Paul Crocker wrote:

I was hoping to see a couple of responses about why the change was made, but
I can respond and say that I have seen that, too, on the last few machine
rooms I've looked at.  Perhaps you could ask the Otis engineer who is
looking at your project why they're changing it.  I am a little curious,
because about 4 years ago we asked if they could change a steel machine room
we were working on to concrete and they were adament that such a think was
unthinkable.
Paul Crocker, PE, SE

-----Original Message-----
From: Kestner, James W. [mailto:jkestner(--nospam--at)somervilleinc.com]
Sent: Tuesday, February 18, 2003 1:56 PM
To: SEAINT
Subject: Traction Elevators


On a recent 8 story project, I was surprised to find out that Otis is
eliminating machine beams and requiring us to provide a 10, 12 or 14" slab
(based upon the elevator capacity) designed to sustain their concentrated
loads. Is this the latest trend...eliminating machine beams?
Jim K.

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