Q. Explain in details the various operations involved in Through Packing - conventional Maintenance by beater packing.
Explain the various operations as per the Permanent Way Manual for through packing.
Ans.-
Through Packing consists of following operations in sequence -
i. Opening of the road - Opening of ballast by shovel or Phawrah for Through Packing is 450 mm in side the track and up to end of sleeper on the out side and to a depth of 50 mm.
ii. Examination of rails, sleepers and fastenings - All rail and sleeper fittings are examined for fitness and good conditions and replaced as required.
iii. Squaring of sleepers - On base line sleepers to be spaced correctly and on the opposite rail to be squared with T square.
iv. Slewing - To be done as per the base rail as required.
v. Gauging - To be done as per the track depending on straight or degree of curvature.
following tolerances of gauge, provided generally uniform gauge can be maintained over long lengths:
a) On straight -6mm to +6mm
b) On overs with radius 350mm or more -6mm to +15mm
c) On curves with radius less than 350m up to +20mm
vi. Packing - Base rail to be packed for two rail lengths to bring longitudinal level by lifting sags packing and then cross checked by level instrument if necessary / possible.
vii. Re packing of joints - All joints and shoulder sleepers to be repacked and at other locations if any settlement and correction to cross level is to be done.
viii. Boxing of ballast - Ballast to be brought back by wire claws to correct profile and rammed for consolidation.