ARMY TM 5-5420-212-10-1
MARINE CORPS TM 08676A-10/1-1
Section IV. COUNTERWEIGHTS - DOUBLE STORY
It is necessary to use counterweights during assembly/delaunch of double story bridges over 12 bays long without
link reinforcement. On normal sites 19 thru 22 bay bridges use counterweights. On restricted sites 13 thru 22 bay bridges
use counterweights. The following paragraphs describe the counterweights, but do not describe when they are added or
removed. This depends on the size of bridge and type of site.
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.
2E + 19 thru 2E + 22 w/o LRS - NORMAL SITE
On 2E + 19 thru 2E + 22 bay double story bridges without link reinforcement, twenty deck units and six curbs are
placed 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 bankseat
beam and four curbs on the top panels to retain the counterweight. The additional twelve deck units are placed on
decking, eight laid flat and four on edge leaning in toward deck units, as shown.
2E + 13 thru 2E + 18 w/o LRS - RESTRICTED SITE
On 2E + 13 thru 2E + 18 bay double story bridges without link reinforcement on a restricted site, thirty eight deck
units are used as counterweight. Eighteen deck units are placed in their final position and the remaining twenty stacked on
one bay of the bridge and secured with straps.