ARMY TM 5-5420-212-10-1MARINE CORPS TM 08676A-10/1-1Section IV. COUNTERWEIGHTS - DOUBLE STORYIt is necessary to use counterweights during assembly/delaunch of double story bridges over 12 bays long withoutlink reinforcement. On normal sites 19 thru 22 bay bridges use counterweights. On restricted sites 13 thru 22 bay bridgesuse counterweights. The following paragraphs describe the counterweights, but do not describe when they are added orremoved. This depends on the size of bridge and type of site.NOTEIt is important to always refer to the build and boom or delaunch table for the bridge being built ordelaunched, to determine when the counterweights are added or removed.6-9.2E + 19 thru 2E + 22 w/o LRS - NORMAL SITEOn 2E + 19 thru 2E + 22 bay double story bridges without link reinforcement, twenty deck units and six curbs areplaced on the rear end of bridge as counterweight.Eight deck units are placed in their final position on the end of bridge. Two curbs are placed on the bankseatbeam and four curbs on the top panels to retain the counterweight. The additional twelve deck units are placed ondecking, eight laid flat and four on edge leaning in toward deck units, as shown.6-10.2E + 13 thru 2E + 18 w/o LRS - RESTRICTED SITEOn 2E + 13 thru 2E + 18 bay double story bridges without link reinforcement on a restricted site, thirty eight deckunits are used as counterweight. Eighteen deck units are placed in their final position and the remaining twenty stacked onone bay of the bridge and secured with straps.6-64
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