Bengaluru civic agency to float Rs 17.7k-cr global tender for tunnel roads soon
With an estimated cost of Rs 17,780 crore, the project aims to transform urban mobility by carving out a subterranean North-South corridor through some of Bengaluru's most-congested stretches.
The project, already approved by the cabinet, will be executed in two packages: Package 1 will cover the more than 8.7-km stretch from Esteem Mall to Seshadri Road, while Package 2 will extend another 8.7-km from Seshadri Road to Silk Board junction.
Together, the twin tunnels will span a combined length of nearly 33.5km.
"Tunnelling work will be carried out using eight tunnel boring machines (TBMs) and is expected to take 26 months. Civil and associated works will require an additional 12 months," said BS Prahalad, director (technical), Bengaluru Smart Infrastructure Limited (B-SMILE), a special purpose vehicle (SPV) established recently by the govt.
"Each TBM can bore up to 2km per year.
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Given the challenges of land acquisition in Bengaluru, underground tunnelling has emerged as the most-feasible option," Prahalad added. The detailed project report (DPR) for the tunnel roads was prepared by Rodic Consultants Pvt Ltd and approved by the govt.
The tunnel road will be open to four-wheelers while a restriction on two-wheelers is under active consideration to ensure safety and operational efficiency.
A toll of Rs 19 per/km has been proposed for 2029-30 period. This estimate draws comparisons with Mumbai's Trans Harbour Link, where toll charges are Rs 250 for a 22-km stretch.
The twin tunnels will be developed under build-operate-transfer (BOT) model. BBMP will contribute 40% of the cost as viability gap funding (VGF). The selected concessionaire will be granted toll-collection rights for a 30-year period following project completion.
According to Prahalad, tender preparations are in their final stages. "The three-lane twin-tube tunnel is expected to bring significant relief to commuters. We are moving quickly towards inviting global tenders," he said.
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