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Indian Railways Institute of Civil Engineering: Forums

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Prabir Kumar Dey
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PostPosted: Mon Nov 17, 2014 12:55 pm Back to top

Can any member provide following information:-
Where to provide Dead End and where to provide Sand hump with reference to circular or letter.
            
            
            
- Prabir Kumar Dey ADEN ... 17-11-14

SUBODH KUMAR JINDAL
CE/C-II/NWR

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PostPosted: Tue Nov 25, 2014 2:37 pm Back to top

Both serves the purpose of isolation. I have not come across any such instructions.
I have seen some people prefering dead end over sand hump.
But sand hump is more economical for the reason that less track length and1 in 8.5 turnout is used than 120 m long overrun with 1 in 12 turnout. But dead end has some advantages also.
It involves less inventory, same 1 in 12 turnout is used. In emergency, the main line switch or crossing can be repalced by using the material from dead end line where the speed is already restricted.
            
            
            
- SUBODH KUMAR JINDAL CE/C-II/NWR ... 25-11-14

Narasimha Murty Gannavarapu
EXECUTIVE ENGINEER(CON)

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PostPosted: Thu Nov 27, 2014 1:13 pm Back to top

When length of 120 m is a constraint and not available sanded dead ends/sand humps will be provided in place of 120 m over run line for isolation purpose.I think sanded dead ends/humps required 67 m length and thus we can have the advantage of 45 m.however both will serve the same purpose of isolation. Standard sand humps drawings are available in every division.
            
            
            
- Narasimha Murty Gannavarapu EXECUTIVE ENGINEER(CON) ... 27-11-14

K.L.V.S. Viswanadham
ASST.MANAGER(CIVIL)/RVNL

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PostPosted: Wed Dec 03, 2014 3:45 pm Back to top

Even the sand hump should have an earth fill of 30m in rear of masonry structure and there shall not be any obstructions for further 30m in rear of earthwork. However, both serve the same purpose of signal isolation.
            
            
            
- K.L.V.S. Viswanadham ASST.MANAGER(CIVIL)/RVNL ... 03-12-14

Pranvir Singh Soam
ADEN

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PostPosted: Thu Dec 04, 2014 3:44 pm Back to top

Actually SUBODH sir's reply clears the use of sand hump and D/End.......as u know both serve the same purpose the isolation........but use of either sand hump or D/End will be decided by available land.....Firstly...mostly used D/End.
Second- If we don't have the margin of extension then use sand hump.
            
            
            
- Pranvir Singh Soam ADEN ... 04-12-14

P.K. Singh
DEN/IV/LUMDING

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PostPosted: Tue Dec 16, 2014 1:54 pm Back to top

I have seen some cases of overshooting by goods trains having weak braking and infringement of main line which could have been prevented in case of sand humps since it diverts away from main line.
            
            
            
- P.K. Singh DEN/IV/LUMDING ... 16-12-14

S. Chandrahas
Sr.Section Engineer(DRG) S.C.Rly.

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PostPosted: Sat Dec 20, 2014 10:16 pm Back to top

The isolations are three.(i) Sand hump (ii) Overshoot line (iii) Trap switch/ Derailing switch.

(I)Sand hump is of 105m length, which is preferred always for safety.The minimum horizontal space of 17.00.(approx.) reqd from the nearest track centers.

(ii) Overshoot is preferred to Sand hump (a) when Hzl space is the constraint and if the line has to be extended in future. The buffer stop is provided with rails at the edge of the overshoot.In SCR Engg sidings are provided as an extension of these overshoots.

(iii)Trap switch is provided in the rear of the uni-directional line to isolate the main line in case of rolling back.

There shall be a minimum distance of 30m between any structure and the dead end if it is not hydraulic buffer stop .

THERE IS NO STD DRG AVAILABLE ON INDIAN RAILWAYS APPROVED BY RDSO FOR HYDRAULIC BUFFER STOP.
            
            
            
- S. Chandrahas Sr.Section Engineer(DRG) S.C.Rly. ... 20-12-14

S. Chandrahas
Sr.Section Engineer(DRG) S.C.Rly.

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PostPosted: Sat Dec 20, 2014 10:16 pm Back to top

The isolations are three.(i) Sand hump (ii) Overshoot line (iii) Trap switch/ Derailing switch.

(I)Sand hump is of 105m length, which is preferred always for safety.The minimum horizontal space of 17.00.(approx.) reqd from the nearest track centers.

(ii) Overshoot is preferred to Sand hump (a) when Hzl space is the constraint and if the line has to be extended in future. The buffer stop is provided with rails at the edge of the overshoot.In SCR Engg sidings are provided as an extension of these overshoots.

(iii)Trap switch is provided in the rear of the uni-directional line to isolate the main line in case of rolling back.

There shall be a minimum distance of 30m between any structure and the dead end if it is not hydraulic buffer stop .

THERE IS NO STD DRG AVAILABLE ON INDIAN RAILWAYS APPROVED BY RDSO FOR HYDRAULIC BUFFER STOP.
            
            
            
- S. Chandrahas Sr.Section Engineer(DRG) S.C.Rly. ... 20-12-14
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