andrewpond
Well-Known Member
HI , Have a site that has long history of site contamination.... I am removing 5 old style car hoist (1 large cylinder in center) in a large auto service garage ie 12 hoists. The issue, is even before it was installed there was environmental issues on site. The excavation is: 8" thick concrete floor, 30" "A" gravel, (here is issue) 6 feet of 3/4 Clear stone and 36" steel corrugated culvert on vertical with the hoist cylinder inside unknown back fill.... likely some concrete but could be 3/4 stone....
Total depth is approx 8 to 10 feet.
1 hoist is started
there is 8 ft sq hole for each hoist cut in floor. We can see undermining back 4ft at 4 ft depth ie 45 deg....
Looking for solution to retain 3/4 so we don't under mind floor....
Sheet piling w Mini Ex ? I don't think trench box will work as 3/4 will move before the trench box drops??
Site is in auto garage with 14 ft high ceiling and its only $3k job so I cannot get too crazy w $$
thankyou
Total depth is approx 8 to 10 feet.
1 hoist is started
there is 8 ft sq hole for each hoist cut in floor. We can see undermining back 4ft at 4 ft depth ie 45 deg....
Looking for solution to retain 3/4 so we don't under mind floor....
Sheet piling w Mini Ex ? I don't think trench box will work as 3/4 will move before the trench box drops??
Site is in auto garage with 14 ft high ceiling and its only $3k job so I cannot get too crazy w $$
thankyou
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