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CASE STUDY CASE STUDY of of
Cantilever Method of Cantilever Method of ErectionErection
CASE STUDY CASE STUDY of of
Cantilever Method of Cantilever Method of ErectionErection
RUB spanning 32.958 mtr. NH-5 (Chennai-Kolkata)
PREPARED BY:PREPARED BY:
Srinibas Sahoo, AXEN/C/E.Co.Rly/CuttackP. Choudhary, AXEN/C/E.Co.Rly/Khurda RoadC.V. Naik, ADEN/E.Co.Rly/SrikakulamB.M. Rao, ADEN/S.E.Rly/Bondamunda
Srinibas Sahoo, AXEN/C/E.Co.Rly/CuttackP. Choudhary, AXEN/C/E.Co.Rly/Khurda RoadC.V. Naik, ADEN/E.Co.Rly/SrikakulamB.M. Rao, ADEN/S.E.Rly/Bondamunda
SITE CONDITION•Heart of Cuttack city on NH and Service Road on both side.
•No scope for middle support, and no diversion Road.
•Space constraint
•Track center 8 mt.
•Skew angle – 27 0
•C/C of bridge shifted 6.5 mt. towards Cuttack due to skew angle.
WHY CANTILEVER METHOD CONSIDERED
• Multispan.• Insufficient Railway land.• Feeding from one end only.• No traffic block possible.
CHARACTERISTICS OF SCHEME
• Excellent quality of fabrication.• Sequential proceedings.• Overall time consumption is less.• Huge quantity of counter-weight.• Tailor made link material, pin &
buffer block.
EQUIPMENT
• Erection crane -5M/T capacity.• Link, Link plate & Link pin.• Temporary Vertical.• Buffer block.• Temporary Portal.• Hanging device.• Trestle beam.
TEMPORARY ARRANGEMENT
• Laying of temporary track for erection crane.
• Erection of derrick crane.• Temporary track for feeding.• Temporary vertical, top link.• Roller bearing, end cross girder &
buffer block.
PRELIMINARY ARRANGEMENTS
• Counter weight 19 M/T • Roller bearing, end cross girder• Main gusset, Diaphragm, riveting
including countersunk rivets on formation.
• Bearing slab, buffer slab.
SEQUENCE OF ERECTION
1. Roller bearing, end cross girder.2. Bottom chord.3. Bottom Lateral Bracings.4. Vertical.5. End Racker.
6. 2nd cross girder, Rail bearer.
SEQUENCE OF ERECTION CONTD…………..
7. Advance of temporary track & crane.
8. Two diagonal L2U1.
9. Two vertical L2U2, Two dia L2U3.
10.Top chord U1U3.
11.Link connection.12.Top lateral bracings, Sway bracing.
SEQUENCE OF ERECTION CONTD…………..
13.Vertical L3U3, Bottom chord L2L4, diagonal L4U3.
14.Cross Girder, Rail bearer, Bottom Lateral Bracing.
15.Erection crane advanced over link & top chord.
16.Advanced progressively.17.Landing Bottom Chord on bed block over CC
Crib.18.Balanced member19.End Racker
PRECAUTION
• Ultra Sonic testing of link pin.• Wire rope, Pulley.• Alert to road user through state
authority.• Full scaffolding, wire net to avoid
falling hot rivet on road.• Fencing by the side existing track.• Round the clock watch man with flag
on Road and Rail.
PROBLEMS ENCOUNTERED
• Problem during piling• Problem during erection• Working on monsoon• No working on rainy day• One way traffic• Shifting of derrick material for
dismantling of errection crane• Dismantling of derrick
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