TM 5-5420-278-100035 000035 00-12BRIDGE ANCHORAGE (Contd)Figure 10. One-, Two-, or Three-Cable System Using One Set of Class 60 Towers.DESIGN OF AN OVERHEAD CABLE ANCHORAGE SYSTEMTable 4 provides the basic information which must be calculated or determinedwhen designing the overhead cable system. An expedient method of design for theoverhead 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 followingparagraphs.Cable design: size and number of overhead cables. Overhead cable systemsmay 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 difficultbecause of the practical limitations of erection equipment and the cable size andweight. If a cable of sufficient diameter is not available, or if the cable required istoo large for the bridle lines and tower fittings, two or three smaller cables mayhave to be installed using a tower cap adapter. Use table 5 to determine the sizeand number of cables required to support Ribbon bridges. Table 6 providesinformation for light tactical bridges. It is important to understand that both table 5and table 6 are based upon the use of IPS cable. If IPS cable is not used, select anappropriate substitute, based upon a comparison of the breaking strength of theavailable cables with that of the required IPS cable. Table 7 provides the weightand breaking strength of IPS cables as well as several other common cable types.ANCHOR TOWER WITH ADAPTERAND THREE ANCHOR CABLESANCHOR TOWER WITH ADAPTERAND TWO ANCHOR CABLESANCHOR TOWER WITH ADAPTERAND ONE ANCHOR CABLE
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