I've thought about the same sort of anchoring, except the idea of using guy
wires didn't occur to me. Of course the problem with anchoring the wires to
the ground is that they would require a considerable distance of available
space around the car. The wires would also interfere with movement around the
car. What about extending the wires upward and anchoring them to ceiling
joists?
Bill Wilkman
BT7
-----Original Message-----
From: Alan Seigrist <healey.nut@gmail.com>
To: wilkmanracing@aol.com; healeys@autox.team.net
Sent: Thu, Dec 17, 2009 6:18 am
Subject: Re: [Healeys] Earthquakes and Lifts
Bill -
I'm originally an engineer from Berzerkeley where we study these
hings, and spent 6 years working for Bechtel.
There is two ways to do this - keep it loose or anchor it down with guy
wires.
You don't want to just bolt the posts to the floor - with up to two
ons six foot in the air that's potentially enough weight to break
ost welds with lots of shaking - in some ways if you just left it on
he wheels it'd probably just roll around rather than topple over if
ou bolted 'er down.
There are actually many buidings in Tokyo that have floating/rolling
oundations for this very reason - loose at ground level is great for
topping things from toppling over.
The best thing to do, however, is to get guy wires and turnbuckles and
onnect them to the top of all four posts then bolt the other end of
he wire to the floor, preferably with the wire at a 45 deg angle to
evel (but any angle past ~ 70 deg to level isn't as good) . This is
he best protection to keep the lot from falling over and how many old
asonry buldings are shored up to withstand quakes. The guy wires are
ood because you can easily loosen them and move the lift around if
ecessary.
Alan
On 12/17/09, wilkmanracing@aol.com <wilkmanracing@aol.com> wrote:
I live in Southern California, AKA earthquake country. I have a four post
lift that, like most four post lifts, does not have to be bolted down. One
concern I have, however, is what happens to a car on the lift and a car
below
the lift in the case of an earthquake. Seems to me that a moderately strong
earthquake could topple a lift leaving both the top and bottom cars in a bad
state. But, just bolting a lift down would not seem to be enough. Unless
the
bolts extended well into a deep footing, I would think a moderately strong
earthquake would pull the bolts out of the ground. Does anyone have any
ideas
as to how to earthquake-proof a lift?
Bill Wilkman
BT7
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Alan
'52 A90
53 BN1
59 Jag Mk IX
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