Bangalore Metro Rail Corporation

Key Achievements

• Normal and U Turn inclined anchors up to 90T capacity were installed for first time in India.
• Keller designed and executed anchors for the retention system for 20 meters deep excavation with high differential water pressure (19 meters water head), which was supported by multi-level anchors (5-8 Levels).

The Project

BMRC was developing an underground metro station in Bangalore. As a part of construction, underground metro stations needed to be constructed at various location within Bangalore city. Keller was commissioned by the main contractor to design and execute anchors for deep excavation as retention system. The proposed retention system comprised of secant pile/soldier pile with inclined U turn anchors.

The Challenge

The main challenge associated with the project was design and installation of anchors for retention system with high differential water head pressure for deepest excavation of 20 meters in a poor soil condition. The additional challenge was to install more than 2600 anchors at various levels in a limited time period with collaboration with excavation contractors.

The Solution

Keller designed and installed up to 90T capacity anchors needed for performance of retention system design. The fixed length of the anchor was filled with various levels of grouting (primary and secondary grouting) to ensure a high strength bond between anchor and soil. The entire free length was covered with PVC pipe to eliminate load transfer and was long enough to bypass the failure wedge.

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Project Facts