TM 5-5420-278-10
0035 00
0035 00-17
BRIDGE ANCHORAGE (Contd)
EXAMPLE
Given the following reconnaissance data,
design the cable for an overhead cable
system for the IRB:
River width: 600 ft (183 m)
Current velocity: 7 feet/sec
(2.1 meters/sec)
Available cable: 1/2-, 1-, and 1 1/4-in.
(12.7-, 25.4-, and 31.8-mm) IPS cables
SOLUTION
Number/size cable: refer to table 5.
A single 1-in. (2.5-cm) cable is sufficient
for this system:
Number of clips: (3 x CD) + 1 =
3 (1) + 1 = 4 clips at each end
Spacing of clips: (6 x CD) = 6 in.
(15.2 cm) apart
L = (1.1 x 600) + 100 = 760 ft (215.3 m)
CL = 760 + 250 = 1010 ft (308 m)
S = 760 x .02 = 15.2 ft (4.6 m)
Figure 12. Initial Sag.
DISTANCE BETWEEN TOWERS
(L)
SAG (S) = 15.2 FT (4.6 M)
SINGLE 1-IN.
(2.5-CM) CABLE
Figure 11. Application of Cable Clips.
U-BOLT
R
S
SADDLE
NUT
RUNNING END
OF CABLE
STANDING END
OF CABLE
