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Re: elevators

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The project is actually on a steep hillside straddling a creek bed beside a
river with decades of loose dumped fill (5 to 20 ft.).  And now they're
going to put an additional 10-30 ft. of compacted fill to level the site.
The Geotech report anticipates up to 15" of long-term settling, so the
structure is completely supported on drilled piers to bedrock with a
structural ground floor slab.  Since the earth is essentially non-existent,
a holed hydraulic will not work.

I too would assume that a holeless roped hydraulic would be the economical
choice, but the architectural drawings appear to indicate a traction unit
sitting in the penthouse.  One reason might be speed - traction elevators
are much faster than hydraulic.

BUT, after visiting the Otis and Schindler sites (thanks for the
information), I have determined that I need much more information that I
have.  So, I'm going to demand more information from the architect
(politely, of course) before I proceed with designing this area.

----
Jason Kilgore
Leigh & O'Kane, L.L.C.
jkilgore(--nospam--at)leok.com
816-444-3144
816-444-9655 (FAX)
----- Original Message ----- 
From: "Roger Turk" <73527.1356(--nospam--at)compuserve.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Thursday, September 18, 2003 9:47 AM
Subject: elevators


> Jason,
>
> I don't deal with elevators often, but unless you are dealing with bedrock
> subsurface conditions, it seems that a traction elevator is rather
expensive
> for a 5-story building.  IIRC, hydraulic elevators are the more economical
> units for this height range.  Telescoping tubes permit rather shallow
> embedment depths.
>
> A. Roger Turk, P.E.(Structural)
> Tucson, Arizona



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