ARMY TM 5-5420-212-10-1
MARINE CORPS TM 08676A-10/1-1
6-7.
DISASSEMBLY - DOUBLE STORY - 2E + 12 BAY (Restricted Site - Near Bank)
a.
General
Disassembly on a restricted site is made possible by using a longer than normal launching nose. Since the
disassembly procedures are similar to a 2E + 12 bay bridge on a normal site (para. 62) only the steps that are different
are given in detail.
b.
Disassembly
(1)
Perform steps a. (1) thru (2) and b. (1) thru (21) in paragraph 62.
CAUTION
The following cautions should be observed each time the bridge is delaunched. Do not allow
vehicle to drift right or left of centerline. Keep vehicle straight and in line with bridge. Movement
of bridge to right or left can cause damage to roller beams.
NOTE
Throughout the build the bridge is boomed using a vehicle, push bar and push bar cross girder
(para. 4-18) which must be disconnected before further bays are added. To simplify the following
procedures these drills are described "connect push bar" and "disconnect push bar."
(2)
Connect push bar. Unlock rollers and delaunch to 12p4 (over FRB). Lock rollers, and disconnect push
bar.
(3)
Disassemble end of bridge.
(4)
Connect push bar. Unlock rollers and delaunch to 11 p4 (over FR B). Lock rollers, and disconnect push
bar.
(5)
Remove bay 12.
(6)
Connect push bar. Unlock rollers and delaunch to 10p4 (over FRB). Lock rollers, and disconnect push
bar
(7)
Continue this process, removing a bay and delaunching to pp 4 of the last bay, until the bridge is
delaunched to 8p4 and bay 9 has been removed.
(8)
Connect push bar. Unlock rollers and delaunch to 2p6 (over FRB), and disconnect push bar.
(9)
Assemble and position rear roller beam over centerline 15 ft (4.6 m) from front roller beam. Position
roller beam using longitudinal girders, then disconnect girder from RRB and place on the ground.
(10) Set roller beams at correct height. During this process, level roller beams with carpenter’s level.
(11) Connect push bar. Unlock rollers and delaunch to 1 p6 (over FRB). Do not disconnect vehicle from
bridge.
NOTE
Center of gravity of bridge is over front roller beam. It is at this point that any minor adjustments
in the rear roller beam placing must be made. Ensure that the bridge will come to rest between the
flanges of the rollers, not on top of them. Ensure rear roller beam Is at 90° to bridge centerline.
(12) Recover landing roller pedestal.
6-58
