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Main Platform with
Main Station Building
Loop line
Main line
Chamber
Longitudinal Drain
Cross Drain
(Underground)
Cross Drain
(Underground)
Main line
Chamber
Cross Drain
(Underground)
Platform
Loop line
Longitudinal Drain
Chamber
Chamber
Cross Drain
(Underground)
Chamber
Chamber
Longitudinal Drain
Chamber
Chamber
Fig. 1 A : Typical Drainage Layout in a Yard
Shows Yard Drain
To Nearest Outfall
To Nearest Outfall
Main Platform with
Main Station Building
Loop line
Main line
Chamber
Chamber
Longitudina l Drain
Cross Drain
(Underground)
Main line
Chamber
Cross Drain
(Underground)
Loop line
Cross Drain
(Underground)
Cross Drain
(Underground)
Chamber
Platform
To Nearest Outfall
To Nearest Outfall
To Nearest Outfall
Fig. 1 B : Typical Drainage Layout in a Yard
Shows Ya rd Dra in
*
To Nearest Outfall
To Nearest Outfall
To Nearest Outfall
Chamber
Chamber
Cha mber
Chamber
Loop line
Ma in line
Chamber
Cha mber
Chamber
Longitudinal Drain
Cross Drain
(Underground)
Cross Drain
(Underground)
Ma in line
Chamber
Cross Drain
(Underground)
Platform
Loop line
Longitudinal Drain
Longitudinal D rain
Chamber
Cross Drain
(Underground)
Main Platform with
Main Station Building
Chamber
Cha mber
Fig. 1 C : Typical Drainage Layout in a Yard
Shows Yard Drain
To Nearest Outfall
To Nearest Outfall
,
Notes for Fig.1A, Fig.1B and Fig.1C
(i)
The longitudinal drain is made of Pre-cast RCC segments, laid on 150mm thick lean concrete. The section of longitudinal drain shall
be as giv en in Fig. 2A or Fig. 2B. The joint/junction betw een the tw o pre-cast elements of longitudinal drain shall be sealed w ith
Cement Mortar or any other suitable sealing material.
(ii)
To minimise excavation for drains, the gradient of longitudinal drain shall be same as gradient of track/formation. For self-cleansing
velocity in the longitudinal drain, bed gradient of 1 in 350 is desirable. Therefore, in cases w here the gradient of yard/formation is 1 in
350 or steeper, the longitudinal drain shall have same gradient as that of yard/formation. How ever, in cases w here gradient of
yard/formation is flatter than 1 in 350, the longitudinal drain shall have gradient of 1 in 350.
(iii)
The top of the longitudinal drain shall be kept parallel to the track/formation profile in the yards. In cases where bed gradient of
longitudinal drain is 1 in 350 and yard/formation gradient is flatter than this, the depth of drain w ill increase along its’ length in the
direction of falling gradient. The maximum depth of drain shall be 1200mm and w herever the depth of longitudinal drain reaches
1200mm, a chamber should be provided as show n in Fig. 3, w ith cross drainage. The invert level of the longitudinal drain w ill change
at the chamber location. After chamber, the longitudinal drain shall continue w ith depth of 450mm/750mm at beginning. If the site
conditions do not per mit a maximum drain depth of 1200mm, a maximum depth of 1000mm can also be adopted, but this w ill
increase the number of chambers and cross drains.
(iv)
On the side w alls of the longitudinal drain, vertical slits of w idth 40mm are provided at a spacing of 250mm c/c. The top of slits is
150mm below the top of drain and the bottom of slits is at the formation level. The depth of slits w ill remain constant. Details of slits
are show n in Fig. 2A and Fig. 2B.
(v)
The longitudinal drains are normally open. How ever, in yards w here there is likelihood of drains getting blocked due to garbage etc.
or movement of maintenance staff is required on longitudinal drains, grated covers can be provided on top.
(vi)
The cross drains shall be perforated pipes, 300mm diameter, w ith wrapping of non-w oven geotextiles, preferably of a type w hic h can
be pushed across the platform and track. How ever, if discharge is more, this can be increased to take care of the anticipated
discharge.
(vii) The cross drain shall cross the track(s) and platform, as needed as per site conditions.
(viii) In case the longitudinal drain meets any culvert in the yard, it shall connect to and discharge in the culvert subject to invert level and
discharge capacity of the culvert permitting it.
(ix)
The gradient of the cross drain shall be 1 in 350 or steeper.
(x)
The chamber size shall be 0.9m x 1.2m. The arrangement at chambers is show n in Fig. 3.
*********
.
B allast
P rofile
Side Slope
B allas t
Profile
Side Slope
10 0 m m
4 50 m m
10 0 m m
A
150 mm
B
Open Slit
Open Slit of Size 45 0 mm
Height and 4 0 m m W idth at
250 mm c/c Sp acing
450 mm
Fo rm ation Top Lev el
Formation T op Level
Pre-C as t
RC C Drain
C
1 50 m m
D
E
150 mm Thick
Lean Concrete
F
900 mm
Fig. 2 A/1: Details of Lo ngitudinal Drain
(For T rack Centre 4265 mm)
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Vertical Slits
Longitudinal Drain Top Level
150
Slit
150
450
40
150
Location of
Minimum Depth of
Longitudinal Drain
250
450
Slit
Formation Level
Invert L
evel of L
ongitud
inal Dr
ain
222350
Fig. 2A/2: Longitudinal Schematic View of The
Longitudinal Drain(For Track Centre 4265 mm)
600
Location of
Maximum Depth of
Longitudinal Drain
,
3
Ballas t
Pro file
S ide Slo pe
B allast
Pr of ile
S ide S lope
100 mm
450 m m
100 m m
A
Open Slit
Ope n S lit of Size 15 0 mm
Heig ht an d 40 m m W idth at
25 0 mm c/c S pacing
15 0 mm
B
Fo rmation To p Level
F or matio n Top Level
15 0 mm
P re-Cast
R CC Dr ain
C
15 0 mm
D
E
150 m m Th ick
Lean C on cre te
F
900 m m
Fig. 2 B/1: Details of L ongitudinal Drain
(For Track C ent re 5300 m m)
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Vertical Slits
Longitudinal Drain Top Level
150
Slit
150
150
Location of
Minimum Depth of
Longitudinal Drain
40
150
250
Inve
rt L e
ve
Formatio n Level
150
l of L
ong it
udi n
al
900
Slit
Drai
n
370590
Location of
Maximum Depth of
Longitudinal Drain
Fig. 2 B/2: Longitudinal Schematic View of The
Longitudinal Drain (For Track Centre 5300 mm)
,
=
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45 0 m m
or 75 0 m m
g
Lo n
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1
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150
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10
C r o s s D r a in
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1 200
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m
C
m m
PC C
1 800
0
150
m m
L e a n C o n c r e te
m m
S E C T I O N A T X -X
C ro s s
D r a in
300
m m
G r a t in g
L o n g it u d i n a l D r a in
4 50 m m
L o n g it u d in a l D r a in
900
m m
45 0 m m
X
X
G r a t in g
1 200
m m
C ro s s
D r a in
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