RAILWAY TRACK CONSTRUCTION CIVIL 2.pptx

Civil railway track construction

1. RAILWAY TRACK CONSTRUCTION RAILWAY TRACK CONSTRUCTION

2. CONSTRUCTION OF RAILWAY TRACKS The construction of Railway track can be divided into three stages. Earthwork Plate laying Laying of ballast

3. EARTH WORK . The formation may be in an embankment or a cutting depending upon the general topography of the area. A formation in an embankment is normally preferred from the point of view of good drainage. The height of embankment above highest water in the area should be at least 60 cm.

4. WIDTH OF FORMATION GAUGE TYPES OF FORMATION WIDTH OF FORMATION(m) Single line Double line BG Embankment 6.10 10.82 Cutting 5.40 10.21 MG Embankment 4.88 8.84 Cutting 4.27 8.23

5. PLATE- LAYING The operation of laying out of the rails and sleepers over the ready formation is known as plate laying. The point from where the laying of track starts is known as the base and the point upon which the new track is carried out is known as the rail head. Methods of plate laying 1. Tramline method or side method 2. Telescopic method 3. American method

6. TRAMLINE METHOD Used when new track is laid next to the existing track. For plate laying of new track, either of the following two methods may be adopted. In this method all the materials are taken from the central depot in material trains on the existing track and are spread on the formation of new track.

7. TELESCOPIC METHOD This method is used very widely in India 1)The material are transported in material train to the farthest point of new track and unloaded . 2)These materials are then transported to the point where work is in progress and different components of track are assembled here . 3)In all 5 operations are involved in telescopic method.

8. AMERICAN METHOD This method involves all mechanical work This method consists of fixing rails to the sleepers and lifting the whole unit by heavy cranes. First one is linked with the rail head, then the train moves ahead by one rail length and the same procedure is repeated. This method is un-economical one and is not used in India

9. LAYING OF BALLEST The ballast is normally spread on the railway lines after the embankment has settled well and at least two monsoons have passed over it. The work of spreading the ballast is done by means of ballast trains, which have special hoppers through which the ballast can automatically unloaded onto the track. be Alternatively, ballast is loaded in wagons of the train and then unloaded at the site into a number of heaps at suitable intervals along the track. Then packing of ballast is done by the workers by means of shovels Ballast laying vehicle

10. RE-LAYING OF TRACKS Method of re-laying : Work of relaying the track is normally divided into the following stages: ( i )Preliminary work: To prepare schedule of materials per 100m length or per km of the track. The entire quantity is collected at the central store, from which day to day requirements is drawn