Side haul railway dry docks
Ship transfer machinery
Chains, rollers and maintenance
Bridles roller system
Restoration & enlargement
Vertical lifting vs. inclined ways
When a railway dry dock travels on a system of
free rollers, the roller frames, which are made in sections 12
to 15 feel long, have some tendency to slip down the inclined
ways gradually. Thus a diver must retrieve the outshore frames
from time to time and place them at the inshore end of the system.
If the rotation is not too frequent the inconvenience is acceptable,
and it at least has the good effect of keeping he rate of wear
even for all rollers.
The steeper the track gradient, however, the greater is the
slippage; and if there is little or no tide, access to the outermost
frames is difficult. In such cases, a special wire rope or chain
bridle can be arranged, one end attached to the cradle and the
other to the track, passing through the other frame train so that
the half-speed behavior of the roller frames is precisely maintained.
Next: Difficult drydocking