07 Construction and Renewal of Tracks (Railway Engineering Lectures هندسة السكك الحديدية & Dr. Walied A. Elsaigh)

1. Dr. Walied A. Elsaigh
welsaigh@ksu.edu.sa
Asst. Prof. of Civil Engineering
Jumada’-I 1437H
CE 435
Railway Engineering
Construction of
Railway Track

2. Textbook
Page 22-1 to 22-11

3. Introduction
Subgrade
Level

4. Typical Cross-Section

5. Construction Stages
Plate Laying
Stage 2
Ballast Laying
Stage 3
Earth Work
Stage 1
http://www.youtube.com/watch?v=T4aALRa9jj
g&feature=player_detailpage

6. Stage 1 Earth Work
Provision of Formation
Consolidation
(Compaction)
Earth work is divided
into two parts
Formation
Formations up (embankment) are always preferred
to formation in cuttings. Why? Think of some
construction difficulties!
Embankment

7. Cont. Stage 1 Earth Work
Consolidation of embankment formation can be done using equipments
similar to those used for highway construction (i.e. Vibratory or impact
compactors). Some admixtures are sprayed to the surface prior to
compaction. It helps consolidation of loose materials
(i.e. Sand as in KSA!)
Why need consolidation? To prevent larger amount
of ballast from sinking into the earth formation.
Gauge Number of tracks
What is the adequate width
of formation?
Provide a list of them

8. Cont. Stage 1 Earth Work
Formation-Grading
Adapted from presentation “ Construction Progress
Update” July 2012 by S.M.A.R.T on Railway track
of Hearn Avenue

9. Cont. Stage 1 Earth Work
Formation-Compaction
Adapted from presentation “ Construction Progress
Update” July 2012 by S.M.A.R.T on Railway track
of Hearn Avenue

10. Cont. Stage 1 Earth Work
Bottom Ballast
Adapted from presentation “ Construction Progress
Update” July 2012 by S.M.A.R.T on Railway track
of Hearn Avenue

11. Stage 2: Plate Laying
Plate Laying is the operation of laying out rails and sleepers
over consolidated formation.
Tramline Method Telescopic Method American Method
Plate Laying Methods

12. Cont. Stage 2: Plate Laying
Tramline Method
Sometimes referred
to as “Side Method”
Temporary tramline is established by the side of the proposed
track for carrying out the necessary materials.
This method is suitable for laying double track. If single track
is intended, then a road parallel to the proposed track is
constructed to transport materials
Tramline method requires a level terrain.
The construction rate is approximately
1.6 km/day.

13. Cont. Stage 2: Plate Laying
Telescopic Method
The telescopic method involves transporting construction
materials, in material trains, to the farthest point of new
track and then unloaded. The material is then carried to
the rail-head and different components of the track are
assembled. This is where construction
is in progress)
The method is basically labour-intensive construction. Ganges
(crews) are formed and allocated for the various operations
involved. Mostly suitable for third-world countries where labour
cost is relatively low and job creation is a requirement.
Simple tools, such as pick axe, are used in the construction process
More labours and
less machine use

14. Cont. Stage 2: Plate Laying
Telescopic Method
The method entails five sequential operations.
Store necessary materials at a depot.
Transporting material from depot to
work site.
Carrying the material to rail-head.
Fixing the rails to sleeper and
joining them to fish-plates.
Packing of track, using ballast, to
correct level and alignment.

15. Cont. Stage 2: Plate Laying
American Method
A fully/ partially automated machine is used for plate laying.
Named as American method because it was originally used in
USA, but its now wide spread in several parts of the world.
A truck mounted
projecting arm or jib
A wagon mounted,
cantilevered arm or jib
Types of machines used for plate laying
http://blogs.howstuffworks.com/2010/07/26/how-to-build-modern-railroad-
track-the-machinery-is-amazing/Web link
Basically used for laying materials
which have been received at rail-
head by material train

16. Cont. Stage 2: Plate Laying
American Method
A wagon mounted,
cantilevered arm or jib

17. Cont. Stage 2: Plate Laying
Placing Sleepers
Adapted from presentation “ Construction Progress
Update” July 2012 by S.M.A.R.T on Railway track
of Hearn Avenue

18. Cont. Stage 2: Plate Laying
Placing and Positioning Rails
Adapted from presentation “ Construction Progress
Update” July 2012 by S.M.A.R.T on Railway track
of Hearn Avenue

19. Cont. Stage 2: Plate Laying
Clipping Rails to Sleepers
Adapted from presentation “ Construction Progress
Update” July 2012 by S.M.A.R.T on Railway track
of Hearn Avenue

20. Stage 3: Ballast Laying
The work of spreading the ballast is done as follows:
Ballast is loaded in wagons of a train and then
unloaded at site into number of heaps at suitable
intervals along side the track.
Ballast can be directly spread by ballast train. The
ballast comes out through openings on wagon floor
while train is moving slowly. A plough can be attached
to the end of the train to spread ballast uniformly

21. Stage 3: Ballast Laying
Placing Top Ballast
Adapted from presentation “ Construction Progress
Update” July 2012 by S.M.A.R.T on Railway track
of Hearn Avenue

22. Stage 3: Ballast Laying
Surfacing and Alignment
Adapted from presentation “ Construction Progress
Update” July 2012 by S.M.A.R.T on Railway track
of Hearn Avenue

23. Welding of Rails
Adapted from presentation “ Construction Progress
Update” July 2012 by S.M.A.R.T on Railway track
of Hearn Avenue

24. Track Ready to
Receive Traffic
Adapted from presentation “ Construction Progress
Update” July 2012 by S.M.A.R.T on Railway track
of Hearn Avenue

25. Railway Track
Material Requirement
Estimate the material required per km

26. Cont. Railway Track
Material Requirement

27. Cont. Railway Track
Material Requirement

28. Cont. Railway Track
Material Requirement

29. Quiz # 2 / 20 minutes
(2) Write a short note on the following yard equipments
(a) Cranes (b) Weigh bridges
(3) Compare between rectangular design and circular design loco-shed.
(4) Write the function of the following yard equipments:
Yard Equipment Function
Buffer stop
Loco-shed
End loading ramp
Loading gauge
Traverser
(1) Provide a sketch for track – platform at passenger terminal
that allows passenger to board alight to/from five destinations.