Figure 2. 12 Launch Beam
The jaws of each beam are aligned to contact the jaw lugs of the beam already
positioned in the launch frame and then pinned in position. The upper jaws first and
then the lower jaws.
The launch beam connecting pins incorporate a flat on the head of the pin, which
allows insertion into the lugs in one position only. The forward launch beam is
permanently retained in the launch frame. It has a jaw connection system identical to
that of the standard launch beam on one end. The opposite end having the mounting
point for the far bank support along with winch cable pulleys.
The launch beams incorporate safety rollers and stop blocks to prevent over
deployment of a launch beam if no following beam is attached.
Home and Far Bank Carriages
The home and far bank carriages are similar assemblies manufactured from
aluminum alloy. They consist of upper frames and lower bridge lifting beam
assemblies pinned together by shootbolts. They are operated and moved by the
drum winches on the launch frame.
Two roller assemblies mounted on the top of each upper frame assembly support the
assembly and on the lower bridge lifting beams to allow separation of the two halves
to lower the bridge.
The lower bridge lifting beams also incorporate attachment points for the bridge lifting
slings. The upper and lower assemblies are fitted with a guide system and
attachment lugs to enable the assemblies to be manually pinned together.