@flga-pls-2-2
I was surprised to not see any rebar impalement protection caps in place during construction of the foundation.
I've taken some time to watch this video which would seem to show the method you describe. Clearly there is a tremendous amount of ground water to be displaced in this application, and presumably the inflow is greater than could be reasonably pumped out. Under those conditions, I get it. It's not exactly arid around here but a 36" hole can be drilled 30'+ deep, the pile placed, and the concrete poured in before the hole even begins to fill with water.
Yea, me too. In the home building industry here in FL, if an inspector sees one rebar sticking up anywhere that's uncapped he shuts the jobsite down. Then the builder has to schedule a reinspection in order to continue work. In most cases it costs $200-400 for a reinspection and takes a week or more. That doesn't sit well with production builders who have to crank out a house in six weeks. ????
Yep, its a good rule. I've been cut by rebar and know of several folks who died from short falls into rebar which killed them.
often water or liquid mud (bentonite) is added to the hole to support the sides. if it were possible then pumping out groundwater would very likely lead to collapse.
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even the heaviest soils will be lighter than concrete but the upward flow pushes the lumps up anyway.
I saw a tremie pipe being used in the original video. I've never known of the method you described being used. Only 1 concrete mix. And it's generally impossible to vibrate it. Most bored piles in this country are CFA now anyway but always concreted to the platform level for the same reason. If something goes wrong and it doesn't the pile would likely need an expensive repair or possibly it would just be condemned.
it's worth bearing in mind that the type of caps that are generally used do not protect against impalement injuries. Still used everywhere in this country and pass the safety inspection in spite of safety alerts highlighting their unsuitability.
one from your country - https://www.osha.gov/laws-regs/standardinterpretations/1997-05-29-0
I??m working on a 60 turbine wind farm now. ?ÿIt??s about 75% complete now. ?ÿThe video is good but the one I??m working on is different in several ways, for example they build the blades on the ground and put all three up at once. ?ÿThe anchor bolt cage was also prebuilt and trucked to the site and set with a crane.
I??ve spent a lot of time on the project but most of it requires very little precision. ?ÿMost of it??s pretty mundane, laying out the new entrance roads, crane paths, shooting crop damage, setting a few control points, staking the transmission line poles, and laying out the substation foundations.?ÿ
The size and scope is pretty massive, a lot of days there is 200 workers on the site. ?ÿFrom our office to the site is 20 miles but there were days I was driving well over 100 miles. ?ÿThe amount of gravel and concrete needed was huge. ?ÿEarly on when laying out the new string roads and the grading limits things were a little crazy, we had a few days there were 7 guys doing layout, but since then me working alone or with a helper has kept up. ?ÿThe new Trimble R10 has been a huge help. ?ÿThe cell coverage is spotty so the 35 watt radio covers the entire site from one base.?ÿ
This a pic of me at the base of a turbine blade. My wing span is 72 inches
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