Page 269 - Moving the Earth_ The Workbook of Excavation

PONDS AND EARTH DAMS

PONDS AND EARTH DAMS 6.5

FIGURE 6.3 Dragline cuts.

The dumping height increases with higher boom angles, an advantage partly offset by a shorter
dumping reach. A low boom is preferable for deep digging and to obtain a good digging reach with-
out casting the bucket. Extra pile height may be obtained by raising the boom to put a top on it, but
keeping it low for the bulk of the digging. A dragline with a live boom can lower it for digging,
and raise it for dumping during the swing; but the extra power needed limits this to occasional use.
The swell and the slope of the soil piles indicated in the diagrams might or might not be applicable
to a particular job. The regular cross section shown will be found only in sand or other free-flowing,
nonsaturated material.
The volume of the piles may be increased by moving the dragline behind them, and pulling