Launch Beam Drive
The launch beam drive is mounted on top of the launch frame and is controlled from
the chest pack. The unit propels the launch beams in the required direction during
build/retrieval. In the event of chest pack failure, the manual control valve mounted
on the A-frame frame stabilizer leg allows manual operation.
Slide Frame Assembly
After deployment of the tail lift, A-frame and launch frame, the slide frame is used to
create the work area required (between the crane and the A-frame) to position the
launch beam and bridging modules for loading. It comprises a telescopic frame, relax
mechanism and tilt rollers.
The frame comprises of three pairs of telescopic steel box sections. The inner
(forward) box sections (Section 1) attach to the launch vehicle chassis via the relax
mechanism and the outer (rear) box sections (Section 3) connect to the A-frame by a
hinged arrangement on the lower transverse beam of the A-frame. The center box
sections (Section 2) attach the inner and outer sub-frames.
Removable rollers are positioned on Section 2 of the slide frame prior to bridge
deployment and removed prior to slide frame retraction. Section 3 of the slide frame
has adjustable height tilt rollers attached which are used to orientate the bridge to the
same angle as the launch beam, so that varying bank heights can be accommodated
during bridge construction.