ARMY TM 5-5420-212-10-1
MARINE CORPS TM 08676A-10/1-1
Section IV. COUNTERWEIGHTS - SINGLE STORY
It is necessary to use counterweights during the assembly/disassembly of 6, 7 and 8 bay single story bridges on
normal sites and 9, 10, 11 and 12 bay single story bridges on restricted sites. The following paragraphs describe these
counterweights but does not describe when they are added or removed. This depends on the size of bridge and type of
site.
NOTE
It is important to always refer to the build and boom or delaunch table for the bridge being built or
delaunched, to determine when the counterweights are added or removed.
5-7.
6 Bay - NORMAL SITE
On 6 bay single story bridges, five deck units are placed on bay 6 as a counterweight
5-8.
7 BAY - NORMAL SITE
On 7 bay single story bridges, two additional bay (bay 8), four deck units and a bankseat beam are used as
counterweight. These are later removed and the bankseat beam refitted in the normal end of bridge position
5-9.
8 BAY - NORMAL SITE
On 8 bay single story bridges, two additional bays (9 and 10), five deck units and a bankseat beam are used as
counterweight. These are later removed and the bankseat beam refitted in the normal end of bridge position
5-39
