Installing the Overhead Cable.

TM-5-5420-278-10 M85 Tank Chassis Transporting: for Bridge Armored-Vehicle-Launched Scissoring Type Class 80 Manual
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TM 5-5420-278-10 0035 00 0035 00-30 BRIDGE ANCHORAGE (Contd) INSTALLATION OF AN OVERHEAD CABLE ANCHORAGE SYSTEM (Contd) d. Installing the Overhead Cable. (1) Emplace anchor cables by mounting the cable reel on the near shore and tow the free end of the cable across the river using a BEB. If the stream bottom is hard and reasonably clear of shelf rocks and snags, this method is most effective. The use of intermediate floating supports, in areas where a large number of potential snags exist on the river bottom, may be of good use. Care must be taken when using intermediate floats, particularly in rivers with a swift current, to ensure that the boat can overcome the drag developed by towing the cable. (2) Once the cable is ready for attachment to the deadman, place the cable under the deadman and around it. If the cable cuts into the ground, place a log or board under the cable at the outlet of the sloping trench. (3) Measure and mark the initial sag distance from the point of support on each tower. (Refer to figure 20.) Establish a line of sight between the marks. Tighten the cable until its lowest point touches the line of sight. This adjustment must be made before the bridge is connected to the cable. Tighten cable clips frequently as more strain is placed on the cable when bridle lines from the floats are attached. After the cable has been placed in service and is under tension, tighten the cable clips again to compensate for any decrease in cable diameter caused by the load and ensure equal distribution of load between the clips. (4) Use the cable clips to secure the cable. Attach these clips above the ground for ease of tightening and maintenance. e. Attachment of Bridle Lines. Once the overhead cable is secured, the bridle line crew can begin connecting the bridle lines from each float to the overhead cable. Bridle lines are normally 32 ft (9.8 m) long sections of 1-in. (2.5-cm) manila rope and are attached to the pontons in the ponton assembly area. Use bridle line connectors (refer to figure 19) to attach the bridle lines to the overhead cable. Figure 19. Bridle Line Connector

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