11.4 Standard on Repair to Tack Components
(1)
(1) TurnoutTurnout a.
a. Heel joint of the switch shall be so maintained that the extent of difference inHeel joint of the switch shall be so maintained that the extent of difference in lateral and vertical shall be kept at the minimum level possible.
lateral and vertical shall be kept at the minimum level possible. b.
b. Part of the tongue rails that contact to the stock rail shall be so maintained that itPart of the tongue rails that contact to the stock rail shall be so maintained that it shall be closely contacted to stock rail limited to allowed value, when the gap shall be closely contacted to stock rail limited to allowed value, when the gap become higher, the repaired work shall be conducted.
become higher, the repaired work shall be conducted. c.
c. The switch locked at all times shall be switched off from time to time, whenever The switch locked at all times shall be switched off from time to time, whenever necessary, and maintenance of close contact or contact under pressure of the necessary, and maintenance of close contact or contact under pressure of the points shall be secured.
points shall be secured. (2)
(2) Rails, Fishplates and Insulated Rail JointsRails, Fishplates and Insulated Rail Joints a.
a. Rails, joint plates and insulated joints to all of which, something unusual hasRails, joint plates and insulated joints to all of which, something unusual has happened, shall be carefully inspected, and defective parts of those regarded as happened, shall be carefully inspected, and defective parts of those regarded as usable instead of replacement, as a result of the inspection/examination, shall be usable instead of replacement, as a result of the inspection/examination, shall be painted
painted white white for for easier easier recognition, recognition, and and always always under under strict strict superintendence.superintendence. And, in case that damage, crack etc. have been quickly worsened, they shall be And, in case that damage, crack etc. have been quickly worsened, they shall be replaced with new ones forthwith.
replaced with new ones forthwith. b.
including the cut upper web round section and the whole circumferential part of including the cut upper web round section and the whole circumferential part of bolt holes shall be chamfering.
bolt holes shall be chamfering. c.
c. Bolts shall be tightened with appropriate tightness, and be maintained, so thatBolts shall be tightened with appropriate tightness, and be maintained, so that looseness shall not occur.
looseness shall not occur. (3)
(3) Sleeper Sleeper
In case that the spacing of sleeper has been expanded or a irregularity has occurred In case that the spacing of sleeper has been expanded or a irregularity has occurred to the right angle of sleeper towards the centre line of track, adjustment shall be to the right angle of sleeper towards the centre line of track, adjustment shall be made within the range specified in the following table.
made within the range specified in the following table.
Type of Type of irregularity irregularity
Expansion of spacing of Expansion of spacing of Sleeper( at the bottom of Sleeper( at the bottom of
rail in the track gauge) rail in the track gauge)
Irregularity in angle of Irregularity in angle of sleeper to center line of track sleeper to center line of track gauge(at the bottom of rail in gauge(at the bottom of rail in
The track gauge) The track gauge)
Range of Range of irregularity
irregularity 70 70 mm mm 60 60 mm mm (80 (80 mm)mm) N.B:
N.B: The parenthesis figures mean the value for the opposite joint in the curve.The parenthesis figures mean the value for the opposite joint in the curve. (4)
(4) BallastBallast a.
a. In the ballast sections, ballast shall be replenished from time to time, lest sleeper In the ballast sections, ballast shall be replenished from time to time, lest sleeper should be exposed by more than the extent as specified below.
should be exposed by more than the extent as specified below. b.
b. Main linesMain lines
Straight line and curve with a radius more than 600m
Straight line and curve with a radius more than 600m : : 30mm30mm c.
c. Curve with a Curve with a radius under 6radius under 600m : 00m : 20mm20mm Sidings 40mm
Sidings 40mm d.
d. In the long rail sections, ballast shall be arranged according to the followings:In the long rail sections, ballast shall be arranged according to the followings: (i)
(i) Side face of sleeper shall not be exposed.Side face of sleeper shall not be exposed. (ii)
(ii) The width of shoulder of ballast shall be kept at more than 400mm.The width of shoulder of ballast shall be kept at more than 400mm. (iii)
(iii) Upper ballast shall be adequately tamped.Upper ballast shall be adequately tamped. (iv)
shoulder of the ballast shall be additionally mounted. shoulder of the ballast shall be additionally mounted.
(5)
(5) Runoff of Track Lifting and LoweringRunoff of Track Lifting and Lowering a.
a. The length over which track lifting or lowering is conducted, shall be more thanThe length over which track lifting or lowering is conducted, shall be more than 400 times the amount of lifting or lowering, and the elevated or lowered part 400 times the amount of lifting or lowering, and the elevated or lowered part shall be fully tamped.
shall be fully tamped. b.
b. Notwithstanding the Notwithstanding the specification ispecification in 78.(1) n 78.(1) above, should above, should it prove it prove that provisionthat provision of the length 400 times the amount of lifting/lowering is impractical, then it may of the length 400 times the amount of lifting/lowering is impractical, then it may be
be reduced reduced down to down to 200 times, 200 times, so so long as long as it it will will not not cause cause any sany serious erious effect effect toto train vibration.
train vibration.