BRIDGE ANCHORAGE (Contd)
SHORE GUY ANCHORAGE
a. Planning considerations. Shore guys are cables attached from the bridge to
deadmen or similar holdfasts on the shore. Shore guys can be used as upstream or
downstream anchorage systems provided that the maximum anticipated current (or
reverse current for downstream systems) does not exceed 3 feet/sec (0.9 meters/sec).
Shore guys may be used for any length of floating bridge provided that a 45-degree
angle can be maintained between the shore guy and the bridge centerline.
b. Materials. Shore guys consist of steel cables attached to deadmen. The cable
used for shore guy systems should be 1/2-in. (12.7-mm) IPS cable or any cable which
has a comparable breaking strength. The length of these cables depends primarily
upon the length of the bridge and the shore conditions.
(1) When shore guys are used as the upstream anchorage system for a bridge,
they are emplaced as the bridge is constructed. (Refer to figure 7.) The cable
should be unreeled from the shore and passed out along the bridge. If
necessary, station one person at every other float to hold the cable out of the
water. Connect guys to the IRB load receiving pins only.
(2) Tighten the shore guys that were attached to the bridge during the bridge
assembly just enough to hold them taut. After bridge completion, tighten the
four approach guys simultaneously to prevent longitudinal movement. Then
tighten the shore guys simultaneously to maintain bridge alignment. Shore
guys must stay above the water to prevent whipping and accumulation of
debris. If necessary, use an A-frame or some other means of intermediate
support to raise the guys clear of the water.