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Message: <blockquote data-quote="Fishfiles" data-source="post: 51512" data-attributes="member: 782"><p>Ya know Tazza  you mentioned air , I started as a heavy equipment apprentice in 1976 , and we didn't have hydraulic breakers when I started , it was air power concrete breakers mounted on excavators , I seem to think KHB 400 was one model ,  they were driven by wheeled air compressors and we had like 200 ft  of air hose lying all over the ground  , sometimes the operator had a guy  on the ground we called a swomper , he would be sure the air line was clear or the machine and obsticals on the gorund like rebar sticking up and sharp edges of broke concrete , sometimes the operator had to swomp for himself , I fixed many of air hoses back then ................. we had a air hammer mounted to a forklift and had a big weight on top off it , we used it to put pilings in for elevator shafts and in exisiting under ground parking garages  , would hammer in 6, 8 ,10 ft of sttel pipe and weld another section to it and slam it down again til it wouldn't more any more , the ground here is really soft and there are sand layers down below , sometimes 10 , 20  , 30 or more feet deep depending on location ,  you should see the equipment they are using today to do the same jobs ..........................a couple of weeks ago I was on a cool job , they are redoing a section of the convention center and turning it into a party /dance hall for the Super Bowl next year that is going to be here , they removing support colums of a 60 ft high celling and had concrete footing that the colums set on that were about 8 ft thick and 20 ft by 20 foot  sqaure , there were steel pipe pilings that were inside the footing with a lot of rebar , they didn't want to use a hydraulic breaker as they didn't want to damage the piling ends as they were going to be repoured into the new concrete  slab , so they drilled the footing and put  expanding putty in the holes and let it set over the weekend ,  thier drill  pattern for the holes was right on as it broke and cracked the footing into slabs about 1.5 ft thick , 2 ft wide and 8 foot long , looked like the Egyptians querried them  ,  I watched the operator of the Volvo excavator with a thumb for the bucket as he picked each slice out the hole effortlessly  , like you pulling a chunk of cheese from a party tray , no small chunks to clean up and the pipes were clean as can be , don't know what the core drilling and putty cost , but would bet it wasn't cheap , they did save a lot of labor cleaning out the hole</p></blockquote><p></p>

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