Posted by bc on May 24, 2021 at 06:59:13 from (24.255.129.137):
In Reply to: Building a dock posted by chuck t on May 22, 2021 at 18:43:23:
Couldn't resist the math problem. 55 gallon X 8.6 is 473 divided by 2 is 236 pounds of displacement per barrel at half way. 6 barrels is 1,416 pounds of displacement.
30' trailer with maybe 6" C channel frame. 60' of 6" C channel at 8.2 pounds per foot is 492 pounds. Add the lighter cross members and figure around 600 pounds for the frame.
Treated 2by6's at 8' long weigh 14 pounds each. 60 2by6's X 14 equals 840 pounds.
600 plus 840 equals 1440 pounds. So about 6 barrels to float the dock around half deep. Add a couple guys on the dock fishing and you get another 2 barrels but may be too high when empty. The blue plastic barrels are just over 23" in diameter and 34" long. The dock would put the barrels about 12" or so in the water with 11" above. I wouldn't think a couple guys fishing on the dock would drop the dock more than a couple more inches. That would be for a floating dock not touching land.
The trick would be barrel placement allowing for the slope of the pond. Figuring you anchor one end on the ground you won't need to support the entire weight of the dock and the barrels would have to be in water over 12" or more deep to float. You could maybe get by with 4 barrels but I'd go with 6. If two guys are on the end of the dock fishing then I'd want 3 barrels across the end and another 3 about half way back. If you wanted the whole dock to float, then I'd still put 3 barrels on the end where people would stand which would be a total of 7 barrels or float it higher and go with 9 barrels.
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