Tunnel boring machine manufacturer Herrenknecht on Tuesday completed factory acceptance tests (FAT) on S-1352A, their 3rd of 4 machines for 26.1 km Line-4 of the 116.1 km Chennai Metro Phase 2 project.
This brand new Ø6.67m diameter Earth Pressure Balance machine is the only new machine that will be deployed by ITD Cementation for Line-4’s 10 km underground section between Power House Ramp – Light House Station. This section consists of roughly 16 kms of TBM tunnels (up & down line).
More specifically, this machine will be deployed on 5.15 km Package UG-1 (Light House – Boat Club) from Light House Station’s TBM Launch Shaft at Marina Beach.
Chennai Metro Rail Ltd (CMRL) had awarded ITD Cem with Line-4’s two underground contracts (UG-1 & UG-2) in January 2022 with a combined contract value of Rs. 3743.24 crore and 48 month deadline.
TBM S1352A will work alongside TBM S-1073B which passed FAT in January 2023.
With this development, FAT for just 1 more TBM (S-1075B) on Line-4 is now pending. That machine was earlier deployed as TBM S-1075 to build tunnels on Mumbai Metro Line-3’s Package UGC-04. In Chennai, it’ll be deployed to build twin tunnels on Package UG-02 (Kodambakkam Flyover – Boat Club) along with TBM S-1074B which passed FAT in March 2023.
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