As with the launch beam, the bridge module sections are placed in position by the crane
operator. The end beam is craned onto its end beam guides, which have been pre-
positioned on either side of the slide frame. The far bank ramp module is raised from the
flatrack, which due to the positioning of the module lifting slings, folds out the ramp panel
on each side of the center decking panels.
The ramp module is connected and then pinned to the end beam. The approach ramps
are placed on top of the ramp module and transported across the gap as the bridge is
The ramp module is pushed through the A-frame by the crane and is then attached to the
far bank carriage. This is then used to support the bridge modules, suspended from the
launch beam, until the bridge is finally completed and lowered into position. The home
bank end of the bridge is supported by rollers on the A-frame during bridge construction.
When the far bank ramp module is located on the A-frame and supported by the far bank
carriage, the next bridge module is positioned and secured with pins and shootbolts to the
far bank ramp.
The chest pack operator then moves the bridge modules forward with appropriate
movements of the joystick. The control system coordinates the movement of the upper
and lower winches to draw the bridge modules along the launch beam.
This sequence continues until all the required bridge modules have been assembled and
the home bank ramp module is then attached and secured to the home bank carriage.
The bridge is then boomed forward to the required position. Locking pins in the carriages
are then removed and the bridge lowered into position.
With the bridge in position and the carriages are disconnected, the A-frame support struts
are raised and the upper A-frame beam and launch beam are lowered. Once lowered the
articulator cylinders are deployed and attached to the slide frame cross member with
shootbolts. The carriages are then withdrawn along the launch beam. The launch beam
is then raised from the far bank by retracting the articulator cylinders. A section of launch
beam is withdrawn, disconnected from the launch beam and stowed by the crane operator
on to the appropriate flatrack.
The next launch beam sections are withdrawn and removed until only the forward launch
beam section remains in the launch frame.
The crane stabilizers are raised and the slide frame closed and secured. The A-frame
stabilizer legs are then raised and the launch vehicle is driven to the staging area and the
launcher is then stowed. During this sequence, the curbs, bridge markers, approach
ramps and bridge defile markers are deployed in preparation for bridge trafficking.