Journal of the Association of Engineering Societies (1881)
Association of Engineering Societies (U.S.) · New York, [etc.] Board of Managers · leaf 170
U6 were met with on the 15^ miles of marsh trestle work, where the length of the piles varied from 25 to 50 feet. The penetration of the 50-foot piles in the marsh was the same as that of the 75-foot piles across the lake. The marsh being about 2 feet above the lake level and the trestle grade… … Fig. 2. Piles in Lake Pontchartrain. The firmer material, where short piles were driven, gave a penetration of 0.20 for a 15 or 20- foot drop of a 3000-pound hammer. Test showed that pile hammer could be so freely dropped as to give eight or nine-tenths of the same penetration as when line was cut…
Engineering
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