Concrete
sleepers: Handling
Concrete sleepers weigh about 215
to 270 kg and about 6 to 8 persons are required to handle one sleeper. The
mechanical handling of concrete sleepers is, therefore, desirable for safety
purposes.
Concrete sleepers: Prohibited Locations
Concrete sleepers, because of their heavy weight and rigidity
of structure, are not suited to yielding formations, fish-plated joints, and
places where uniform packing cannot be achieved. Concrete sleepers as such are
normally laid at only those locations where LWRs are permissible. These
sleepers should not be laid at the following locations:
(a) New
formation in banks unless specially compacted
(b) Any rock
cuttings, except where a minimum depth of 300 mm of ballast cushion has been
provided
(c) Un-ballasted
lines in yards
(d) Curves of
radius less than 500 m
(e) Troublesome
formations
(f) Near ashpits
and other locations where drivers habitually drop ash
(g) At
locations where excessive corrosion is expected
(h) On
un-ballasted bridges and on arch bridges, where the height between the arch and
the bottom of the ballast section is less than 1 m, and on slab bridges, where
the ballast cushion between the bottom of the sleepers and the top of the slab
is less than 300 mm
(i) With
fish-plated tracks. Should be used only with long welded rails. Fish-plated
joints on concrete sleeper tracks, where unavoidable, should have wooden
sleepers at joints.
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