Posted by Billy NY on October 14, 2010 at 04:45:38 from (74.67.3.54):
In Reply to: Re: OT what a workout posted by Bryan iniowa on October 13, 2010 at 19:34:44:
Bryan, the technical term is called, "Angle of Repose" typically a 45 degree angle slope, from the base of the cut, which is your hole. That is quite a bit of over digging, when necessary. He is right about osha and the danger. Usually required at a certain depth, I cannot recall, but can't be more than 5 or 6 feet, where you must provide shoring or bench/slope the excavation walls back. I've been involved with a couple of trench collapses, one was me, was holding a rope attached to a phone cable on the side of the cut, gave way, was still hanging on to that rope, cut was 17 feet deep, another was digging a water line and my dumb @ss forman went into the trench to get the transit rod, side wall collapsed, chunk came off and pinned him to the opposite wall of the trench, knocked the wind out of him and it took me over an hour to dig him out by hand, I was running the backhoe. Trench was 5-6 feet deep, all in sand, we soon got a trench box on this job site, not sure what the company's owner was thinking, he was a partner in a big highway outfit, he knew better. You can tell, if there are little collapses, good chance the sidewalls will cave in, some sands are dense and compacted, depends on moisture, but with sand's gradation, there are no various sizes of aggregate and depending on moisture content, it can be unstable, too much or too little moisture, BE CAREFUL whatever you do LOL ! Looks good so far, just be real careful when laying block, you don't want a sidewall collapsing onto a fresh wall, you probably know most of this anyway, be safe !
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