ARMY TM 5-5420-212-10-1MARINE CORPS TM 08676A-10/1-1Section I. INTRODUCTIONThis chapter provides the information needed to select the best site for the bridge, determine the length and classof the bridge, perform bridge design, and assemble/disassemble all Medium Girder Bridges (MGB) with and withoutreinforcement.NOTETo simplify the tables and text in this chapter, some areas are not dual dimensioned. To convertmetric Into U.S. standards use the conversion chart on the Inside back cover of this manual.Section II. SERVICE ON RECEIPT3-1INTRODUCTIONThis section provides the information to unpack, inventory and inspect the components of bridge, erection setsand link reinforcement sets before everyday use.3-2SERVICE ON RECEIPTa.Before unpacking, ensure that the containers are the right side up.b.Unpack and inventory the components listed in supply catalogs SC 5420-97-CL-E52 and SC 5420-97-CL-E53 for bridge and erection sets, and SC 5420-97-CL-E56 for link reinforcement sets.c.Inspection of all components will be performed in accordance with Table 2-2.d.Check all components for any damage that may have occurred during shipping and ensure that they arein a serviceable condition. Send any defective item to Unit Maintenance.Section III. PRELIMINARY PLANNING3-3SAFE WORKING LOADSNOTEParagraphs a, b and Table 3-1 are not for normal operations or bridge design, but specialinformation if MGB or its components are to be used In special circumstances.a.GeneralThis section gives the maximum permissible loads which may be applied to components when loaded asillustrated below. No allowance has been made for impact or self weight. The maximum loads given are in some caseslower than those used in the rest of the TM.Loads must be evenly distributed over an area at least 200 mm (8 in) times the full width of components. It isadvisable to use timber to distribute the load and to avoid slippage between metal to metal surfaces.b.To find the maximum allowable load ’LOAD’For girders (Table 3-1 items 1 to 6) the allowable load can be calculated from tabulated values of momentresistance and shear. The example below shows how to derive load for a single story girder.3-2
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