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Kingston,Mi | Rock rip-rap is sized by the energy it has to withstand, normal concrete "urban rip-rap" would not withstand the energy of the waves for very long before it fails. The use on the Flint River Dikes works because we were working with different forces. An engineer I worked for had been on a project in Huntington W. Virginia (I believe that was the city) where they were repairing storm damage to a section of the river and were installing blocks of stone to dissipate the rivers energy. The calculations called for angular blocks that were 10 tons each. They wanted the 6 or so surfaces to be fairly equal in dimension. 20,000 pounds divided by 150 pounds per cubic ft. for concrete would be a cube of 133 cubic ft. of concrete. The cube root of 133 is 5.1 ft. , so the average item would have been 5x5x5 feet with some larger and some smaller.
The concrete yard in Saginaw was getting close to empty on one of our emergency jobs and they loaded out a single piece of concrete in a pup trailer and sent it to our job site. The truck driver dumped it plus the lead and left. The driver of the pit truck that was bringing rip-rap to where we were working reported that it was by far too large for the hydro hoe to load on his pit truck or to reload on the transport. It was about 6 x6x6 ft. or about 16 tons. We decided to bury it where it landed in the turn around at the end of a dead end road. That piece of concrete likely was part of a machine base at General Motors. | |
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Hog barn guys....this is your future
