TM 5-5420-278-100035 000035 00-11BRIDGE ANCHORAGE (Contd)OVERHEAD CABLE SYSTEM (Contd)EXAMPLEGiven the following reconnaissance data,design a complete long-term anchoragesystem for the IRB:River width: 500 ft (152.5 m)Current velocity: 6 feet/sec (1.8 meters/sec)River bottom is composed of solidgranite (rock).No reverse current is expected.SOLUTIONAnchorage system will include:1. Approach guys: use 1/2-in. (12.7-mm) manila rope.2. Upstream system: use overheadcable system (table 2).3. Downstream system: use shoreguys attached to every 10th float (table 3).Figure 9. Typical Use of Overhead Cable as Upstream Anchorage.DEADMANANCHOR CABLEBRIDLE LINESANCHORTOWERCURRENT 0–11 FEET/SEC (0–3.4 METERS/SEC)(NO REVERSE CURRENT)
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