PRE-BLOCK WORK details

PRE-REQUISITE WORKS BEFORE TAMPING

Important pre-requisite works before maintenance tamping are as discussed below:

1. Track surveying
2. Ensuring firm bracing between rail and sleeper
3. Replacing defective rails and sleepers
4. Track gauge correction
5. Ballast bed attention
6. Destressing of rails 
7. Adjustment of creep
8. Attention of hogged
9. Track drainage

Now read in details

1. Track surveying: For determination of correction values to achieve the target geometry i.e. for calculation of lifting and slew value detail survey should be done, otherwise it may not be possible to achieve desired track geometry by machine itself.
2. Ensuring firm bracing between rail and sleeper: firm bracing between rail and sleeper should be ensured. Replacement of defective rail fastenings, pads and other elements should be ensured; otherwise uniform pacing and desired  track parameters may not be achieved.
3. Replacing defective rails and sleepers:- Defective rails and sleepers should be replaced well in advance. In addition, it should also be ensured that sleepers are uniformly spaced and squared to avoid hitting of tamping tools with sleepers.
4. Track gauge correction:- Checking and correcting the track gauge before tamping of track should be ensured otherwise if done after tamping will distrub the track parameters and thereby result in rough running.
5. Ballast bed attention :- When larger lifting values have to be cartried out or in the case of a ballast deficiencfy, ballast should be filled in advance at required locations. Adequate ballast in shoulder & crib should also be ensured. Ensure suficient Ballast cushion (min. 150mm) for proper tamping. Pumping locations should be attended and filled with fresh and clean ballast. Similarly rounded ballast should be replaced with clean and angular ballast.
6. Destressing of rails :- if required and necessary should be done before tamping to have a maintained track parameters and smooth running for a longer duration.
7. Adjustment of creep:- Expansion gaps in joints, buffer rails and SEJs etc.
8. Attention to hogged, Battered and low joints.
9. Track drainage should be improved for better retentivity of pacing.

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