Appendix　6.3-2

　

Examination of Sleeper Spacing

　

1. According to UBTSL,sleeper spacing is proposed as 1200〜1400 pieces/km. From the view point of track strength sufficient to support LRT train running, sleeper spacing of 1200〜1400 pieces/km namely,71.4〜83.3cm were examined.

　

2. Preconditions

　

(a) Rail

UIC 54 Rail weight=54.4kg/m

Ix=2346cm4 (2nd sectional moment of rail)

Zx=313cm3 (sectional coefficient)

　

(b) Train speed

Vmax=75km/h

　

(c) Train loading condition (for one wheel each)

　

　

(d)Rail　pad　elasticity

Dl=100t/cm

Ballast elasticity per one rail fastening

D2=300t/cm

　

(e)

　

　

E=young's modules of rail(2.lX106kg/c?u)

a=sleeper　spacing：71.4cm

76.9cm(1300pices/km)

83.3cm(1200pices/km)

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