BMRCL Namma Metro Yellow Line (RV Road – Bommasandra Corridor)
Massive supply of certified high-ductility rebar packages and fabricated steel sections for the 18.8 km elevated Yellow Line transit corridor connecting RV Road to the electronics city industrial belt in Bommasandra.
Engineering & Strategic Scope
The Yellow Line of Bengaluru's Namma Metro is a landmark 18.8 km elevated mass rapid transit corridor designed to de-congest the Hosur Road and Electronics City tech corridor. The project features 16 elevated stations and India's pioneering double-decker flyover at the Central Silk Board junction, where vehicular traffic runs on the lower deck and metro trains operate on the upper deck.
Architectural Expression & Spatial Dynamics
The infrastructure integrates complex multi-tier viaduct geometry into dense urban arterial corridors. The elevated stations feature cantilevered steel gull-wing roofs that extend over the platform edges, maximizing natural ventilation while protecting commuters from monsoon downpours with minimum ground footprint.
Structural Rigor & Critical Environmental Criteria
High Dynamic Cyclic Loading: Elevated viaducts experience continuous braking and acceleration load cycles from 6-car metro trainsets, necessitating steel with extreme fatigue endurance.
Double-Decker Torsional Loads: At the Central Silk Board intersection, pier caps withstand concurrent vehicular and rail loads, requiring tightly spaced Fe 550D shear stirrups with 135-degree seismic hooks.
Congested Urban Logistics: Steel dispatches had to navigate severe Bengaluru arterial traffic, requiring just-in-time delivery directly to mobile launching girder cranes.
Zero Tolerance on Dimensions: Pier reinforcement cages were pre-fabricated to millimeter tolerances to ensure precise alignment with segment guide pins.
Supplied Grades & Application Matrix
| Material / Item | Specification & Standards | Structural Application |
|---|---|---|
| Primary Fe 500D & Fe 550D TMT Rebars | IS 1786:2008, 12mm to 40mm | Monolithic cast pier shafts, pier caps, and portal beam reinforcement |
| IS 2062 Grade E350 Heavy Structural Steel Plates | IS 2062:2011 Grade E350 BR/BO | Special composite steel girder spans over national highway crossings |
| Structural Hollow Sections (RHS / SHS) | IS 4923 Grade YSt 310 | Elevated passenger platform canopy frames and concourse stairways |
Testing Protocols & MTC Certification
Key Execution Milestones
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