ARMY TM 5-5420-212-10-1MARINE CORPS TM 08676A-10/1-1Section IV. COUNTERWEIGHTS - SINGLE STORYIt is necessary to use counterweights during the assembly/disassembly of 6, 7 and 8 bay single story bridges onnormal sites and 9, 10, 11 and 12 bay single story bridges on restricted sites. The following paragraphs describe thesecounterweights but does not describe when they are added or removed. This depends on the size of bridge and type ofsite.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.5-7.6 Bay - NORMAL SITEOn 6 bay single story bridges, five deck units are placed on bay 6 as a counterweight5-8.7 BAY - NORMAL SITEOn 7 bay single story bridges, two additional bay (bay 8), four deck units and a bankseat beam are used ascounterweight. These are later removed and the bankseat beam refitted in the normal end of bridge position5-9.8 BAY - NORMAL SITEOn 8 bay single story bridges, two additional bays (9 and 10), five deck units and a bankseat beam are used ascounterweight. These are later removed and the bankseat beam refitted in the normal end of bridge position5-39
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