modern methods of railway track maintanence
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MODERN METHODS OF
TRACK MAINTANENCE
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The following are the main modern methods of track maintance :
•Mechanised Maintanence or Mechanical Tamping
•Measured Shovel Packing
• Directed Track Maintanence
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MECHANISED MAINTANENCE
• It makes use of track machines namely tampers for day to day track maintanence
• This method is relatively more effective, economical, and effivient to cater the needs of high speed and heavier axlle loads.
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Methods of Mechanical Tamping
• Off -Track Tamping
• On- Track Tamping
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Off-Track Tamping
• Off-track tampers which are portable & can be taken off the track within a short period of time are used.
• They work in pairs from opposite sides of the sleepers diagonally under the rail seat to ensure maximum consolidation of the ballast.
• It requires no blocking of the traffic
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Demerits
•Maintanence of tampers is difficult
• High standard of maintance cannot be achieved
• Intensive supervision is needed
• Transportation of tampers with power unit is dificult
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Types of Off-Track Tampers
1. Self-contained
Percussion type Vibratory type
2. Off-track tampers worked from a common power unit
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On- Track Tamping
• On-track tampers which are self-propelled vehicles are used to tamp the sleepers automactically through various controls provided in the operator's cabin
• These are superior to off-track tampers in respect of control, efficiency, quality of work and retention of tamping.
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• Automatic aligning, lifting, cross and longitudinal levelling and packing are simultaneously possible
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Types of On- Track Tampers
• Light On- Track Tampers
• Heavy On- Track Tampers
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Off-Track Tamper
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Measured Shovel Packing
• In this method,the track defects like unevenness and voids , are accurately measured , the track is lifted by means of jacks and measured quantities of small broken stone chippings are placed under the sleeper, to bring the track to the predetermined level.
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Merits
• No traffic block is neede for carrying out maintanence job
•More output
• Less materials are needed
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• Packing retentivity of fish joined sleepers are more
• Less tedious
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Demerits
• Suitable for only flat bottom sleepers like wooden & concrete
• Special sized stone chipping maynot be readily available
• Even for daily maintanence skilled labour is needed
• Cannot be used for newly screened track
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Equipments used for M.S.P
• Dansometer
• Canne-a-boule
• Fleximeter
• Viseur & Mire
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• Gauge-cum-level
• Lifting shovel
• Packing shovel
• Dosing shovel
•Measuring can
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Aplications of M.S.P
•Maintanence of flat bottom wooden sleepers
• Packing of joint wooden sleepers in metal sleeper track
• Through packing of turnouts
• Dehogging of the hogged rail ends
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DIRECTED TRACK MAINTANENCE (D.T.M)
• It is a method to maintain the track as directed by day-to-day requirements but not as prescribed routine.
• It is also called Track Maintanence System or TMS
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• It consists of 3 stages:
• Proper identification of defects in track geometry by means of measuring and recording devices
• Rectification of these defects only at indicated locations in order to maintain the track to predetermined standards
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• Checking the quality of work and output by the superviser incharge of maintanence
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Objectives of D.T.M
• To maintain the track to a high standard of maintanence as per the prescribed tolerances
• To achieve economy in maintanence by avoiding unnecessary work involving men and materials
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Procedure for D.T.M
1. Identification of defects
2. Record of observation
3. Rectification of defects
4. Record of maintanence work
5. Quality of control
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