PSN-L Email List Message

Subject: Re: Help with self leveling Lehman
From: ian@...........
Date: Wed, 20 Nov 2002 09:23:25 +0000 (GMT)

a few dimensions would help, width, length and depth of the peer.  I hope to be 
making one in the next 6 months.  Does the peer have to be the same size as the 
platform it supports all the way down or can it have a small circular cross 


Ian Smith

Quoting meredithlamb :

> Hi all,
> The "worst possible helpful reality resolution" (ha), to frequent
> horizontal seismometer adjustments is to actually get down and
> dirty and make a large/thick isolated ground pier out of concrete
> and house it all with a surrounding insulated box/vault/building.
> For the "physical work allergic" members....I'd suggest you
> somehow get your wife, kids, (someone else) to do all the
> digging, mixing of concrete (yea....sure!!...."you say"...ha).
> Their will still be house influenced tilt when its made
> underneath such; even in loose soil, but it should yield
> considerably less need for set screw adjustments in the long term.
> I'd even suggest that the pier be made over thick insulation
> pliable plastic sheet/s, to keep the ground moisture/water
> out of the concrete pier itself.  A surrounding covering "vault"
> thats well insulated will also help somewhat.  I used to use
> concrete patio squares on loose dirt and that required
> several adjustments a week (for a horizontal).  With the
> present "vault" and pier, its now ~ once a month.
> A vertical is not very influenced by "ground" tilt of course ......
> but....they tend to be much more temperature sensitive, where a
> coiled or flat spring is involved....hence adding ALOT of insulation
> "R factor" is quite helpful.  Without insulation and on a simple
> dirt/concrete paver, I used to have to adjust it ~ once a day....
> but with a insulated vault, its ~ every 6 months or so.
> Take care, Meredith
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