Fittings
of Steel Trough Sleepers
The
fittings required for metal sleepers are different form those used for wooden
sleepers. Loose jaws, keys, and rubber pads are used to fix rails to steel
sleepers.
Loose jaws
Loose
jaws (Fig. 10.11) and keys are used for holding the rail and the steel trough
sleeper together. The older type of trough sleepers were easily damaged,
cracked, or deformed due to the provision of pressed-up lugs. There problems
have been solved by introducing spring steel loose jaws, which have been
standardized on Indian Railways. These jaws can be easily replaced whenever
necessary. They are manufactured using spring steel and the weight of 100 loose
jaws is approximately 28.8 kg.
Two-way keys
Two-way keys (Fig. 10.12) are
universally used for fixing trough sleepers, pot sleepers, and CST-9 sleepers.
A two-way taper is provided at both ends of a two-way key and as such the key
can be driven in either direction. These keys are manufactured using a special
rolled section. The length of the keys for BG is about 190 mm with a taper of 1
in 32. A gauge variation of ±3 mm can be adjusted by altering the extent to
which these keys are driven in.
The various methods of driving
keys for different types of sleepers are listed in Table 10.5.
Rubber-coated and epoxy-coated fish
plates
Some time back, rubber-coated
fish plates were used at insulated joints on Indian Railways on a trial basis.
The results indicated that these fish plates get damaged early in service,
thereby limiting their life. Therefore, epoxy-coated fish plates are now being
tried.
Mota
Singh Liner
The holes
in trough sleepers get elongated during service due to the wear and tear caused
on account of moving loads. The Mota Singh liner (Fig. 10.13) is liner used
effectively with loose jaws for overcoming the problem of elongated holes.
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