ARMY TM 5-5420-212-10-1MARINE CORPS TM 08676A-10/1-1(4)To achieve proper bearing if the bridge has been over designed for the gap to be spanned.NOTEBridges must be designed to achieve the correct bearing. Over design will result In excessivepacking or ground removal.b.Packing(1)Only pack under the girders of the bridge and do not exceed the bearing dimensions.(2)If layers of packing are necessary, construct each layer at 90 to the previous one.(3)Never have metal to metal contact. If metal is used for packing, each layer must be separated by a layerof wood to prevent slipping. Therefore the layer of packing in contact with the bridge must 4-89 be woodto prevent slipping and damage to the bridge bottom chord.4-89
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