TM 5-5420-278-100035 000035 00-18BRIDGE ANCHORAGE (Contd)TOWER DESIGNWhen installing an overhead cable system, Class 60 towers are used to ensurethat the master cable remains at least 3 ft (0.9 m) above the water level. The towercomponents are provided with each set of M4T6 and Class 60 and located in theRibbon Bridge Supplemental Set. The tower assembly is made up of a tower base, apivot unit, six tower sections, a tower cap, a cap adapter, and two wire rope slings.(Refer to figure 13.) If Class 60 towers are not available, Bailey bridge panels can beused to construct an adequate tower. For additional information, see Appendix B inTC 5-210.CAPCAP ADAPTERPIVOT UNITBASE PLATEERECTION ARMCAP + BASE = 3 FT 8 1/4 IN. (1.13 M)SECTIONS = 10 FT 10 IN. (3.30 M) EACHMAXIMUM HEIGHT = 68 FT 8 1/4 IN. (20.95 M)TOWER SECTIONEXAMPLEGiven the following reconnaissance data,design the tower for an overhead cablesystem used to anchor the IRB:River width: 600 ft (183 m)Current velocity: 7 feet/sec (2.1 meters/sec)Bank heights:Near shore: 10 ft (3 m)Far shore: 3 ft (0.9 m)SOLUTION1. Determine the required tower heights.Near shore: HR = 3 + S – BH = 3 + 15.2 – 10 = 8.2 ft (2.5 m)Far shore: HR = 3 + S – BH =3 + 15.2 – 3 = 15.2 ft (4.6 m)2. Refer to table 8 to determine actualnear and far shore tower heights.Near shore: H = 14 ft 6 1/4 in. (4.43 m)Far shore: H = 25 ft 4 1/4 in. (7.73 m)
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
