ARMY TM 5-5420-212-10-1MARINE CORPS TM 08676A-10/1-1Section III. PRINCIPLES OF OPERATION1-11.INTERFACE OF MGB COMPONENTSThis section describes how the major MGB components work and interface with each other. The use individualcomponents varies, depending on the type and length of bridge being assembled.FIGURE 1-5. Launching Single Story Bridges up to 50ft (15.2m)(1)TOP PANEL. Forms the main girders of the bridge. Top panels are connected to each other and other panels byshootbolts and panel pins, using a guide system to align the panels to enable the panel pins to be inserted.(2)BANKSEAT BEAM. Provides the spading between bridge girders and can support MGB’s maximum load whenbearing its length. Bankseat beam connects to top panels or end taper panels.(3)LIGHT LAUNCHING NOSE, FRONT AND REAR. Used a complete launching nose for 4 thru 8 bay single storybridges and as the forward section of the launching nose on all other bridges. They connect to each other using alaunching nose pin. The rear light launching nose connects to the bankseat beam or the launching nose heavy.(4)ROLLER BEAM ON FIXED SUPPORT AND BASEPLATE. Allows the bridge to be boomed (moved) duringassembly or disassembly, using rollers which can be locked. Ground conditions determine whether the rollerbeam is placed on fixed supports and baseplates during launch of single story bridges.(5)LANDING ROLLER. Used on far bank to receive the launching nose. Can be used on ground for 4 thru 8 baysingle story, or on landing roller pedestal for longer bridges.(6)BUILDING PEDESTAL. Used under girders to keep bridge off ground during construction of all single storybridges.1-85
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