BRIDGE ANCHORAGE (Contd)
DEADMAN DESIGN (Contd)
(2) The minimum mean depth of a deadman is 3 ft (0.9 m). There is a real
danger of the deadman being pulled out of the ground at depths of less than
3 ft (0.9 m).
(3) The maximum mean depth of a deadman is 7 ft (2.1 m). Beyond this depth,
the advantage achieved in holding power is offset by the difficulty in
emplacing the deadman.
To determine the actual mean depth of deadman (depth to the center of the deadman),
calculate DDmax using the formula given earlier. Compare this value to the minimum
and maximum values given in rules 2 and 3, and adjust the depth as necessary.
Figure 14. Determination of Deadman Dimensions.
Figure 15. Depth of Deadman.
DEPTH OF HOLE
MEAN DEPTH OF
LENGTH OF DEADMAN
HEIGHT OF DEADMAN
1 FT (0.3 M) MINIMUM
(DEPTH OF HOLE ABOVE
GROUND WATER LEVEL)