Structural Collapse Rescue

Comment

Comment by Bill Cummings on February 9, 2011 at 10:17am

Does anyone have any feedback on the use of laminated Douglas Fir in Rescue Shoring? We have a local manufacturer and are looking at the possibility of obtaining shoring materials through them and would really appreciate some unbiased opinions regarding its use versus using "standard" Douglas Fir, if you will. Thanks in advance.

Comment by BRENT WEIR on October 8, 2010 at 1:59am

hey Michael! I was instructing at a USAR refresher for our County Team this week, and whipped up this jig in about 10 minutes. To start, it helps to have a 10" skillsaw to cut through 4x4's. I took a 2'x2' piece of scrap plywood. cut 2 4x4's at 12-1/2" and sandwiched a 2x4 between them (to get proper spacing) and nailed them flush with end of plywood. Then took a 2' 4x4 and attached to plywood perpendicular to the other 4x4's... this is the stop for the 2x4 that will be cut for the wedges. I measured the blade to the outside of the table on the saw, then marked it off. Nailed scrap piece of plywood on the line (guide for saw) Cut this same distance off guide from bottom edge of 4x4's. Then just slide in a 2x4, cut flush with end of jig, then run saw along guide, going through 4x4 stop enough to fully cut the wedge set, and volia! They turned out great! Change dimensions to fit the type of wedges you need. I'll try to get a picture to post as well.

Comment by Michael Yinhar on October 7, 2010 at 12:42pm

David G******** tried reaching you offline and was rejected by your server
My email is myinman@gmail.com
Many thanks for your offer to help
Michael Yinhar

Comment by David O. Couvelha on October 4, 2010 at 3:22pm

Michael,

Contact me off line and I can send you copies of our 2x4 & 4x4 wedge jig plans. Pretty simple and they work. My email is couvelha@ku.edu.

Comment by Michael Yinhar on August 25, 2010 at 2:32pm

any pointers on jigs for cutting 2x4 wedges using a circular saw or a chop saw?
Michael Yinhar

Comment by Drew Smith on June 29, 2010 at 11:13am

The below link shows illustrations of grading stamps. These are applied by mills to lumber. These stamps indicate the species and grade of the lumber. I obtained this from the Candian Wood Council and it is based on the American Lumber Standards Board of Review

In the publication THE U.S. SPAN BOOK FOR MAJOR KUMBER SPECIES you can not only see what spans are available for each grade but find additional information about bending strength both parallel and perpendicular to the grain. Other book show these values as well.

As for supplier, a true lumber yard will give you what you ask for and these stamps verify that.



SPHFDOCE35210062910480.pdf

Comment by Mike Donahue on June 20, 2010 at 10:25am

The wood inspection comment brings up a good point. More times than none we build shoring systems with what is stocked on our lumber trucks, and or what is delivered by an outside company to the actual scene (for larger operations). We have to rely on our own knowledge and ability to chose which lumber we'll shore with and what lumber becomes wedges. Do you think we can have good quality control or trust our suppliers to give us only the best? They may man not have the knowledge and or understanding of all that is considered when engineering these systems (PSI Rating, Wood Type, Age, Is it straight)
I'd like to throw this question out there ... How many departments and or teams rotate their stock of shoring lumber? Do you date the lumber to display when you loaded it? If you don't it may be a good idea.
What are your thoughts?
Happy Fathers Day,
Mike Donahue
Progressive Rescue

Comment by BRENT WEIR on January 18, 2010 at 2:05am

Broke at a knot in the post, just like yours did... Brings up an interesting point... How many of us have actually inspected a post before using it in a shore? I can say that in my short training carrier, I haven't actually heard anyone mention that as a step in the shore building process.

Comment by BRENT WEIR on January 18, 2010 at 2:00am

Comment by John O'Connell on May 31, 2009 at 12:06pm

Hi Jim, the double T shore is still a temporary spot shore, even though it has two posts making it alot more stable. the only test data i know of is with the USACE, we tested two double T's tied together like a laced post. it held over 100,000 lbs before one of the posts broke at a knot. the single double T will be more than twice as strong as a single T BUT what the real issue is how is it loaded,,, if the shore is out of plumb or the load is unbalanced above, who nows how much it will hold.

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