National Highway & Rail Overbridge (ROB) Steel Girder Spans
Supplied heavy structural steel plates and fabricated composite girders for major highway interchanges and railway overbridges (ROBs), engineered for high cyclic fatigue and heavy axle loading.
Engineering & Strategic Scope
Railway Overbridges (ROBs) and national highway grade separators are critical transport choke points that require long clear spans over live rail tracks and multi-lane expressways. Sarvottam Steel supplies heavy-gauge structural steel plates in grades E350 and E410 to specialized bridge fabricators building composite steel plate girders and bowstring arch spans.
Architectural Expression & Spatial Dynamics
Steel bowstring arch bridges and continuous composite plate girder spans provide dramatic gateway landmarks over major transportation arteries. Their slender profiles minimize approach embankment heights, reducing land acquisition requirements and urban environmental footprint.
Structural Rigor & Critical Environmental Criteria
Extreme Dynamic Rail Fatigue: Railway spans must withstand 25-tonne axle loads repeated millions of times over a 100-year design life without fatigue cracking along weld toes.
Sub-Zero Impact Notch Toughness: Bridge plates require guaranteed impact energy absorption (>= 27 Joules at -20°C) to prevent brittle fracture under sudden shock loads.
Night-Time Crane Launching Over Rail Tracks: Launching girders over electrified railway tracks requires precision bolt alignment for HSFG bolted splices during 2-hour rail blocks.
Supplied Grades & Application Matrix
| Material / Item | Specification & Standards | Structural Application |
|---|---|---|
| IS 2062 Grade E350 & E410 Structural Steel Heavy Plates | IS 2062:2011 Grade E350 C / E410 C (Normalized / TMCP), 12mm to 63mm | Bridge girder webs, top and bottom tension flanges, and diaphragm stiffeners |
| High-Strength Friction Grip (HSFG) Splice Plates & Fasteners | IS 4000 / IS 3757 Class 8.8 & 10.9 | Field-bolted moment connections for girder splices over live crossings |
| Shear Connector Studs | AWS D1.1 / ISO 13918 Drawn Arc Studs, 19mm & 22mm | Composite action transfer between steel top flange and concrete deck slab |
Testing Protocols & MTC Certification
Key Execution Milestones
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Procuring Steel for a High-Rise, Transit Viaduct, or Industrial Facility?
Upload your project bar bending schedules (BBS), structural drawings, or bill of materials (BOQ). Our senior metallurgical and structural estimators will calculate optimal cutting lengths, bundle weights, and deliver commercial mill pricing within 2 to 4 hours.