TM 5-5420-278-10
0035 00
0035 00-12
BRIDGE ANCHORAGE (Contd)
Figure 10. One-, Two-, or Three-Cable System Using One Set of Class 60 Towers.
DESIGN OF AN OVERHEAD CABLE ANCHORAGE SYSTEM
Table 4 provides the basic information which must be calculated or determined
when designing the overhead cable system. An expedient method of design for the
overhead cable system is given in Appendix C of Military Float Bridge Equipment,
TC 5-210. If the assumptions upon which this design sequence is based are invalid,
or if a better understanding of this design sequence is desired, refer to the following
paragraphs.
Cable design: size and number of overhead cables. Overhead cable systems
may be constructed as one-, two-, or three-cable systems. (Refer to figure 10.) Single-
cable systems can be built for bridges as long as 1,200 ft (366 m) in most cases.
Installation of cable spans up to 1,500 ft (457.5 m) is possible, but more difficult
because of the practical limitations of erection equipment and the cable size and
weight. If a cable of sufficient diameter is not available, or if the cable required is
too large for the bridle lines and tower fittings, two or three smaller cables may
have to be installed using a tower cap adapter. Use table 5 to determine the size
and number of cables required to support Ribbon bridges. Table 6 provides
information for light tactical bridges. It is important to understand that both table 5
and table 6 are based upon the use of IPS cable. If IPS cable is not used, select an
appropriate substitute, based upon a comparison of the breaking strength of the
available cables with that of the required IPS cable. Table 7 provides the weight
and breaking strength of IPS cables as well as several other common cable types.
ANCHOR TOWER WITH ADAPTER
AND THREE ANCHOR CABLES
ANCHOR TOWER WITH ADAPTER
AND TWO ANCHOR CABLES
ANCHOR TOWER WITH ADAPTER
AND ONE ANCHOR CABLE
