[RE-wrenches] helical screw piers
Ken Schaal
ken at commonwealthsolar.com
Mon Jan 26 04:40:17 PST 2009
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: info at 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.
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From: re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at 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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