Ken,
We have done a lot of ground mounts
We usually do an excavation at least to frost depth, 4 feet here, and
then use either sonotubes or big foot tubes if the ground is wet, set
on a couple of inches of gravel.
We then set a 2" schedule 40 galvanized steel pipe, that has been
drilled near the bottom and a 6" piece of rebar fastened to prevent
twisting and pull out, in each form and build a wooden frame around
the steel to keep them plumb, square and in alignment. Then we pour
concrete and often get charged extra for a small load of concrete.
We come back and strip the wooden framework and hand grade what the
back hoe was not able to finish.
With the screw piers it was just myself and the equipment operator.
No damage to the site. Ready to go the next day with the mounting racks
They charged us $250 per post, labor and material and engineering.
If we had 20 or 30 posts to set it would either be a negotiated price
for the whole job or a careful calculation as to the least expensive
option
Larry
On Jan 26, 2009, at 7:40 AM, Ken Schaal wrote:
Would you be able to show the cost for those 8 piers??
Did you do some estimates for pole mounts or concrete pier mounts??
Thanks
Ken
----- Original Message -----
From: Larry Brown
To: i...@asappower.com ; RE-wrenches
Sent: Monday, January 26, 2009 7:24 AM
Subject: Re: [RE-wrenches] helical screw piers
Wrenches,
We used a company called techno Metal Post
( www.technometalpost.com ) I believe it is a franchise arrangement
with the main company in Canada. Here is a business opportunity if
a franchise does not exist in your community.
They are screwed into the ground while hydraulic pressure is
applied. We received a stamped engineering report after completion
that identified how many posts were set, to what depth and how
much hydraulic pressure had been applied for load bearing capacity
It requires a special unit designed for this purpose
We set 8 posts in 2 rows of 4 and then attached a UniRac U-LA
Ground Mount racking system for 28 Sanyo 200's
The posts in this case were 2" schedule 40 galvanized steel pipe
ready for the UniRac mounting system
They also shot the elevation and cut each pipe to the proper height
so that the relationship between the front row of pipes and the
back row of pipes was set to receive the racking system and then
the mounting rails would be at latitude for this site. We supplied
the heights that were required.
Many other uses for these screw piers. Pictures on their website
Larry
On Jan 26, 2009, at 1:48 AM, ASAP POWER! 2 wrote:
Sounds like we gots to have it. Larry, any pics? If I assume
correctly, these are literally screwing into the ground in place
of a concrete footing. such that you can place/attach a
structural or pipe column or its part of the screw. I can call
some local rental yards and do some internet searching, but is
there a brand name to the screw, driver, or a specialized 4WD
unit? How many did you drive for 5.6kW?
I had contacted the outfit that advertised on TV/web for a while a
couple of years ago, but wasn't impressed, however, thought maybe
with the right soil it could be exceptional tool for quick guy
wire anchoring purposes for wind towers. This sounds like
something more substantial.
Thanks,
Peter D.
From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-
wrenches-boun...@lists.re-wrenches.org] On Behalf Of Larry Brown
Sent: Sunday, January 25, 2009 5:58 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] helical screw piers
Eric,
We just used helical screw piers on a 5.6kw ground mount
The site was difficult due to its slope and soft because the frost
had come back out after some warm days
There was an excellent chance that a concrete truck would have
gotten stuck and a back hoe would have made a mess
The 4 wheel drive unit that drives the helical screw piers had no
trouble navigating the terrain, did no damage to the site, was in
and out in less than a day.
The piers were in two parallel rows and all were within 1/2" of
our string, though that is in the skill of the operator
In very rocky soil it might be more problematic
Larry Brown
Sun Mountain
On Jan 25, 2009, at 8:05 PM, Eric Andrews wrote:
Does anyone have any experience using Helical screw pier footing
for ground mount racks?
Eric
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