Q. - What are important points to be kept in mind to maintain switches in good condition?
Ans.- Important points to be kept in mind to maintain switches in good condition –
1. Manual Maintenance :- Covers rectification of clearances, gauge, level & alignment; tightening of fittings; packing.
2. Machine Maintenance :- By UNIMAT tampers. Alignment, levelling and packing is done. Machine packing is essential for concrete sleeper layouts.
3. Reconditioning :- Switches and crossings are reconditioned if the wear comes close to permissible limits.
4. Ensure efficient drainage.
5. Ensure adequate ballast cushion.
6. Ensure correct spacing of sleepers.
7. No junction fish plate at SRJ and HOC. At least one rail should be of the same section.
8. Spherical washers are used on skew side. In I.R.S. turnouts with straight switches, these should be provided on the left hand side invariably in the switch assembly.
9. Burred stock rail should be replaced.
10. Creep anchors and box anchoring of one rail length ahead of stock rail.
11. Desirable to weld SRJ and lead curve joints.
12. Lubrication of gauge face of tongue rail.
13. ST sleepers – Wooden blocks under crossing in case of ST sleepers.
14. Gauge Tie Plate should be used on wooden layouts under switch and crossing.
15. Tongue rail should bear evenly on all the slide chairs.
16. No change of cant outside ATS and HOX for a distance of 20 m on BG and 15 m on MG.
17. In case of straight switches, correct amount of bend should be given to the stock rail on the turnout side at the theoretical toe of switch.
18. Tongue rail should bear evenly on all the side chair. When the tongue rail is in closed portion, it must bear evenly against distance studs or blocks.
19. Insertion or removal of P & C in a running line affecting layout must be carried out only after obtaining sanction of CRS.
20. Avoid - Gap at toe, Loose packing and loose bolts in switch, Tight gauge at nose of crossing, Loose bolts in crossing assembly.
21. If only wing rails are replaced, the difference in the level of nose of Xing and wing rail to be as per original assembly
22. On Toes where one road is used predominantly, the wear on Stock Rail should be closely monitored and attended.
23. Grind gauge face of stock rail if burr is there.
24. Maintain P & C with zero missing fittings.
25. In case of bad housing, replace that pair of Stock Rail & Tongue Rail if not able to rectify.
26. Cleaning and Lubrication of Points :- At all interlocked and partially interlocked stations the signal staff will be responsible for the periodical cleaning and lubrication of those slide chairs in which signaling and interlocking gears are connected generally up to 3rd sleeper from toe of switch in all points interlocked with signals or provided with locks.
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