ARMY TM 5-5420-212-10-1
MARINE CORPS TM 08676A-10/1-1
Section I. INTRODUCTION
This chapter provides the information needed to select the best site for the bridge, determine the length and class
of the bridge, perform bridge design, and assemble/disassemble all Medium Girder Bridges (MGB) with and without
reinforcement.
NOTE
To simplify the tables and text in this chapter, some areas are not dual dimensioned. To convert
metric Into U.S. standards use the conversion chart on the Inside back cover of this manual.
Section II. SERVICE ON RECEIPT
3-1
INTRODUCTION
This section provides the information to unpack, inventory and inspect the components of bridge, erection sets
and link reinforcement sets before everyday use.
3-2
SERVICE ON RECEIPT
a.
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 are
in a serviceable condition. Send any defective item to Unit Maintenance.
Section III. PRELIMINARY PLANNING
3-3
SAFE WORKING LOADS
NOTE
Paragraphs a, b and Table 3-1 are not for normal operations or bridge design, but special
information if MGB or its components are to be used In special circumstances.
a.
General
This section gives the maximum permissible loads which may be applied to components when loaded as
illustrated below. No allowance has been made for impact or self weight. The maximum loads given are in some cases
lower 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 is
advisable 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 moment
resistance and shear. The example below shows how to derive load for a single story girder.
3-2
