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A question for you concrete experts....
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<blockquote data-quote="chenocetah" data-source="post: 828012" data-attributes="member: 13521"><p>Wow!!! Was just thumbing around & came across this thread......'bout blew my mind reading all of this - From all the posts here (& all the bickering back & to), I'm going to place my head on the chopping block and offer my opinion as I may be the only contractor that has actually built a significant number of inground bunkers to post to this.</p><p>Sub-base conditions are site specific & must be addressed accordingly, but in "general" this formula will work anywhere - Remove all pumping material & replace w/ suitable backfill - If sub-base holds up a backhoe w/ front bucket full of dirt without the front tires making tracks, compaction is ok - Spread 3-4" screenings over entire site - We stack 2' x 6' concrete waste blocks in a staggering pattern on the screenings up both sides above the original ground line, you can go 4 high with backfill on the outside & increase capacity vs floor area - Fine grade interior area - Chalk a concrete placement line 6" high down the inside of ea waste block wall - Roll out @ least a 6 mil poly vapor barrier - Place a mat of #4 rebar 12" OC ea way on top of concrete bricks allowing for a break for expansion joints in a basically square pattern, I don't like to get any bigger than 30' x30' - Mark these joint locations on the waste block wall for reference later- Roll out 6" x 6" #10 wire mesh solid over rebar on top of bricks & secure w/ tie wire - On entrance & exit ends, dig a 12" deep x 18" wide footing & place 4 #4 rebar crosswise by securing to stakes - Hire a pump truck to place 4000 psi concrete w/ a max of 5" slump (if you request no flyash your concrete provider should oblige, we hardly ever use flyash) - Have plenty of help to place & finish - Topcoat w/ a sealer as soon as you get off finish work - Next morning saw control joints about 2" deep in previously marked locations...........Built many of them over the years, never seen one fail in any way - Never had a complaint from a customer - May not be the "absolute cheapest" way to build one, but if you don't want to build it but once, it works.</p></blockquote><p></p>
[QUOTE="chenocetah, post: 828012, member: 13521"] Wow!!! Was just thumbing around & came across this thread......'bout blew my mind reading all of this - From all the posts here (& all the bickering back & to), I'm going to place my head on the chopping block and offer my opinion as I may be the only contractor that has actually built a significant number of inground bunkers to post to this. Sub-base conditions are site specific & must be addressed accordingly, but in "general" this formula will work anywhere - Remove all pumping material & replace w/ suitable backfill - If sub-base holds up a backhoe w/ front bucket full of dirt without the front tires making tracks, compaction is ok - Spread 3-4" screenings over entire site - We stack 2' x 6' concrete waste blocks in a staggering pattern on the screenings up both sides above the original ground line, you can go 4 high with backfill on the outside & increase capacity vs floor area - Fine grade interior area - Chalk a concrete placement line 6" high down the inside of ea waste block wall - Roll out @ least a 6 mil poly vapor barrier - Place a mat of #4 rebar 12" OC ea way on top of concrete bricks allowing for a break for expansion joints in a basically square pattern, I don't like to get any bigger than 30' x30' - Mark these joint locations on the waste block wall for reference later- Roll out 6" x 6" #10 wire mesh solid over rebar on top of bricks & secure w/ tie wire - On entrance & exit ends, dig a 12" deep x 18" wide footing & place 4 #4 rebar crosswise by securing to stakes - Hire a pump truck to place 4000 psi concrete w/ a max of 5" slump (if you request no flyash your concrete provider should oblige, we hardly ever use flyash) - Have plenty of help to place & finish - Topcoat w/ a sealer as soon as you get off finish work - Next morning saw control joints about 2" deep in previously marked locations...........Built many of them over the years, never seen one fail in any way - Never had a complaint from a customer - May not be the "absolute cheapest" way to build one, but if you don't want to build it but once, it works. [/QUOTE]
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