Bangalore Metro installs 65m composite steel girder on ORR metro line

Bangalore Metro Rail Corporation Ltd (BMRCL) has successfully launched a 65-meter-long composite girder over the Salem Railway Bridge along the Outer Ring Road (ORR) Metro Line. Despite logistical challenges, the team efficiently executed the project with a single 700MT crane, ensuring minimal disruption to road and rail traffic.

Image Credit (representational): BMRCL


A Complex Operation Overcoming Key Challenges:

The project required meticulous planning and execution due to the site constraints, including the absence of service roads and the restricted opening at the railway underpass. Unlike standard procedures where two 400–500 MT cranes are deployed on either side, BMRCL strategically opted for a single 700 MT crane to minimize traffic disruptions.

The 65-meter span was divided into three sections—two end sections of 14.5 meters each and a central section of 36 meters—to accommodate the crane’s operational capacity. The project received prior approval from the Commissioner of Metro Rail Safety (Southern Circle), ensuring safety compliance before commencing the launching scheme and temporary staging.

Technical Specifications of the Railway Span:

  • Total Span Length: 65 meters
  • Total Weight: 575 MT
  • Number of Girders: 4
  • Depth of Girders: 3.4 meters

BMRCL primarily uses 28-meter U-Girders for Phase 2A and 2B of the metro expansion. However, for long-span crossings at major traffic junctions, flyovers, and railway lines, composite girders have been adopted to ensure structural integrity and durability.

Precision Execution with Zero Tolerance:

The erection posed additional challenges as the composite girder needed precise alignment with pre-installed 14.5-meter girders at a height of 14-15 meters. Any misalignment could have impacted the structure’s stability. To mitigate risks, a standby crane was kept on-site, and nearly three hours were required to set up the 700 MT crane for each operation.

Next Steps & Project Completion Timeline:

While the major girder erection is now complete, BMRCL aims to finalize the remaining works in the next two months. This includes installing the remaining 14.5-meter girder sections, deck slab, parapet, and other finishing tasks to ensure complete restoration of the road below.

Conclusion:

The successful launch of the 65-meter composite girder marks a significant milestone for BMRCL, reinforcing its commitment to efficient metro expansion. With seamless coordination from Traffic Police, Railways, and stakeholders, this achievement brings Bangalore one step closer to enhanced urban mobility along the ORR Metro corridor.


Source: BMRCL – Press Release | Featured Image Credit: BMRCL

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