CE's Circular No. 220

 

Sub: LWR Plans.

 

 

                   All the LWR Plans prepared in divisions should strictly follow the check lists, which is enclosed duly updated to incorporate the amendments up to correction slip No.7

 

                   Henceforth all the LWR Plans will be personally approved by THOD during their visit to the division. Sr. DEN/Co-ord of the division will personally scrutinize the plan and approve provisionally before putting it up to THOD.

 

 

Encl: as above

 

 

           Sd/-

    (Mahesh Chand)

 Chief Track Engineer

 

CHECK  LIST  OF  LWR  PROPOSAL

 

Drawing No.

 

1.                    Is the LWR/CWR  plan prepared as per specimen given in LWR Mannual’ 1996 (Fig. 5.1.3 ) at page no. 96?

 

2.                    Is it signed by DEN/SR. DEN (Line) and SR. DEN (CO.) in the division or DEN & Dy.CE in construction?

 

3.                    Does have provision for the signature of THOD?

 

4.                    Does the plan indicate chainage of all Point and Crossings,  TPTCs of curves, Bridges ( with type, span & overall length & chainage of abutment ), Level Crossings (chainage of either end of L/C ), Junction of the Gradients, Junction of the different rail section and proposed SEJs?

 

5.                    Does the plan show proposed LWR/CWR in red colour?

 

6.                    Is the plan made in scale 10 cm : 1 km?

 

7.                    Is the steepest grade on the proposed LWR 1 in 100 or flatter? (3.3.1)

 

8.                    Is the radius of the sharpest curve on the proposed LWRs 440 metres or more?(3.2.1)

 

9.                    Is the radius of the sharpest reverse curve on the proposed LWRs 875  metres or more?(3.2.2)

 

10.                 Is the radius of the vertical curve on the proposed LWRs? (3.3.2)

a)                   4000 metres or more on A route.

b)                  3000 metres or more on B route.

c)                   2500 metres or more on C route.

 

11.                 Is the minimum depth of clean ballast cushion 250 mm or more? (4.2)

 

12.                 Are all the SEJs located on straight or upto ˝ o curve (excluding transition portion)? (4.5.5)

 

13.                 Are the SEJs located at least 150 metres away from the Level Crossing? (i.e. there should be no L/C on the breathing length.) (4.5.2 )

 

14.                 Are the SEJs located at least three rail length (39 m) away from the stock rail joints and heel of crossing with details of P&C  type and layout?(4.5.3)

 

15.                 Are the Points of P&C in facing or trailing direction?

 

16.                 Does the plan give the track details ( i.e. L/C, Point & Xing, Bridges, Gradients etc.) for at least 200 metres before the Ist SEJ (on the left hand side ) and 200 metres after the last SEJ (on the right hand side) of the proposed LWR to examine and study the feasibility of locating the Ist & last SEJ?

 

17.                 Is the LWR proposed over any Girder bridge? If so have the relevant provisions of para 4.5.7.1 of LWR Manual’1996 been satisfied?

 

18.                 Are the SEJs located at least 50 metres away on either side with well anchored  track when the bridge is isolated  from the LWR? [4.5.7(ii)]

 

19.                 Is the LWR continued over any PSC  Girder (Ballasted Deck) provided with bearings? (4.5.6)

 

20.                 Has it been certified that: 

 

a)                   USFD test will be done before welding & defective rails will not be welded.

b)                  All rails will be end cropped and fish bolt holes eliminated before welding.

c)                   Gluied Insulated joints G3 (L) type will be used on track circuit area on LWR/CWRs.(4.5.4)

 

21.                 Has any LWR/CWR been proposed on IRS sleeper with key type of fastenings?[4.3.1 Note b & corrigendum no. 3 of para 4.5.7.1(I) b (I) ]

 

22.                 Is any LWR laid on CST-9 Sleeper?(4.3.1 Note-a & c)

 

23.                 Are two different rail sections in any one LWR?{Corrigendum No-5 of 4.4.1(I)}

 

24.                 Are the SEJs located at least 20 metres away from the nearest change of grade? (4.5.6)

 

25.                 A)        Is any SEJ located on transition portion of a curve (irrespective of the degree of curve)? (4.5.5)

 

B)               Are the SEJs located at least 39 metres away from  TP/TCs? (4.5.5) (as far as possible breathing length should not fall on transition curve)

 

26.                 Is the sleeper density 1540 per km or above? (4.3.3)

 

27.                 Is any LWR/CWR passing through any Points &Crossings? (4.5.3.1)

 

28.                 Is the minimum length of CWR restricted to 3 km?

 

29.                 Is the formation stabilised?(4.5.6)

 

 

 

N.B.     Concerned paras of the LWR Mnual’1996 have been referred within  bracket.

 

 

 

 

 

 

 

 

 

 

 

 

 

NUMERICAL  CHECKING  THE  CHAINAGE  OF LWR

 

 

 

 

 

 

 

 

 

 

 

 

Sl.

CH.

Level Xing

Point & Xing

Curve

 

Gradient

Bridge

 

No.

of

CH. 

Dist. from

CH. Of

Dist. from

CH. Of TPTC

Dist. From

CH.of

Dist.from

CH. Of Br.

Dist.from

 

SEJ

Of

SEJ(Minm

Pt. & Xing

SEJ(Minm

of curve.

SEJ(Minm

Junc. Of

SEJ(Minm

abutment.

SEJ(Minm

 

 

L.C.

150mm)

 

39m on

 

39m)

Gradient.

20m)

 

50m.)

 

 

 

 

 

facing & 82m

 

 

 

 

 

 

 

 

 

 

 

on trailing.)