Figure 8. Typical Overhead Cable System.TM 5-5420-278-100035 000035 00-10BRIDGE ANCHORAGE (Contd)OVERHEAD CABLE SYSTEMa. Overhead cable. An overhead cable system consists of one or more towersupported cables spanning the river parallel to the bridge. (Refer to figures 8 and 9.)Each end of the overhead cable is secured to the shore, preferably through the use ofdeadmen. Bridle lines are used to connect each bay of bridge to the overhead cable.The cable functions like the cable used in a suspension bridge, except that in itsfinal working position the cable is inclined toward the bridge because of the force ofthe current on the bridge.b. Planning considerations. The overhead cable system can be used as bothupstream and downstream anchorage systems. An overhead cable system can hold aheavy floating bridge in current less than or equal to 11 feet/sec (3.4 meters/sec).The following basic reconnaissance information must be determined in order todesign an overhead cable system: river width, current velocity, bank heights (nearand far shore), depth of ground water table, type of bridge to be supported. (Refer totable 4.)It is also important to be aware of the sizes and types of cable available for use asan overhead cable and the dimensions and types of materials that are available foruse as a deadman.DEADMANTOWERCURRENTGLAHCLCLO2O1C
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