re girder ing

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Introduction Rehabilitation of

bridges are essential

because of: Ageing factor

Introduction of higherloading standard.


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Critical factors of re-girdering

To be done under runningtraffic.

Time constrained.

Space constrained.

Huge safety arrangement. High technical abilities.


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Methods of re-girdering

of Plate Girders Using Railway BD crane.

Using Road crane. Side slewing method.

Other Suitable methods.

Using lifting frames.
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Benefit of this method

Standardized, Suitable for anysite condition.

Able to tackle replacement ofbed block also in same block.

Removal the released girder

from bridge in same block. Proven system, over 100 span

replaced.


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Features of this project

Sharing of experience.

To help others to adoptsame method, when

required.


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Method

Preliminary activities.

Replacement of girder.

Post block activities.


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Preliminary activities Assembling & Riveting of

Girder

Painting of girder. Assembling of Lifting crane

and Special trolley.

Placement of rails for pulling.

Fixing of bed blocks withgirder.


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Dismantling ofexisting masonryand bed stone/isolated bed block

with Out-riggerarrangement.


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Out-Rigger

XXY ZZ

WoodenSupport


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Hard WoodSupport

Hard WoodSupport

WoodenSupport


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Replacement of girder

Placing of Lifting frames& Special Trolleys ontrack.

Pulling of girder over

Trolleys.


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New AssembledGirder (NG)

Tirfers

Lift FrameFar (LF)

Lift FrameNear (LN)Specially DesignedTrolley (T)

Fig1: Arrangement at approaches


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Move the entire loadtowards existing girder.

Support the Lifting frame

over pier/ abutment.

Hang the new girder from

the lifting frame.


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Remove Track structure.

Remove connectingbracings of ex. girder.

Slew the ex. girder oneither side over pier.


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Ex. Girders


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Lay epoxy layer overcleaned bed block.

Lower the bed block in

position.

Place the new girder in

position.


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Link The Track.

Hold the released girderwith lifting frame.

Remove all frames andtrolleys from bridge and

then from Track.Clear Block.


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Time studyPlacing lifting frames and trolleys

loaded with girder on runningtrack

45 min

Placing new girder over ex. girder

and lifting with lifting frame

35 min

Slewing ex girder and placing bedblock and new girder

110 min

Removing released girders and allaccessories from track 50 min

Unforeseen times 30 min


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Total time required:270 minutes.


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Manpower StudySupervisors 2 nos.

Skilled Staff 32 Nos.

P. Way gang 13 nos.

Un-skilled staff 24 nos.

Other staff 4 nos.


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Total Staff required:

75 Heads


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Major tools & equipmentsAir Compressor Lifting & Pulling

Machine

Lifting Frame Riveting tools

Special Trolley Hydraulic jacks

Yard crane for

assembling

Traverser Base

Chain Pulley block Other small tools


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Precautionary Measure

General Arrangement Drawing.

Line & level of girder.

Checking of gadgets & toolsbefore use.

Movement of gadgets & girders

to position.

Placement of Bed blocks.

Safety to running traffic.


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Conclusion Method developed under the

guidance of

Sri Chahatey Ram, DRM/ Lucknow

Sri R. N. Drivedi, CTE/ TM/ WR(Previously CBE & Dy.CE/Bridge,Eastern Railway).

Executed by M/s BBJ ConstructionCo. Ltd., Kolkata,


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Not the easiest

But

Standardized methodfor re-girdering of

plate girders at anysite condition.


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Proven System

Already more than100 girders replaced

successfully


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re girder ing

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