Afcons Begins Kolkata Metro Line-6’s D-Wall Work at Airport
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Afcons Infrastructure this weekend began work to construct the diaphragm wall (D-wall) of Kolkata Metro Line-6 (Orange Line)’s underground airport tunnel as part of Package ANVS-RVNL-1682.
Kolkata Metro’s Airport Station will serve as the northern terminal of the 29.87 km Line-6 (Kavi Subhash New Garia – Biman Bandar). It’ll also be a stop on the 6.87 km Line-4 (Noapara – Airport) which will be extended northward to New Barrackpore.
The station’s box is under construction by ITD Cementation with 4 lines and a train stabling facility. Afcons’ scope here includes constructing an approximately 950m underground cut & cover tunnel through the Airports Authority of India (AAI)’s land.
![](https://live.staticflickr.com/65535/52698422499_88275368a2_o.jpg)
Afcons was awarded Package ANVS-RVNL-1682’s Rs. 532.65 crore civil construction contract in January 2021 with a 36 month deadline. This 3.519 km mostly elevated civil package will connect Sub CBD-2 Station to Biman Bandar.
Their scope includes the construction of 2 new stations at Chinar Park (formerly Rabindra Tirtha) and VIP Road (Haldiram), and the following viaduct & underground sections:
- Viaduct (2 sections)
Section 1: (CH: 25900 approx.) to CP:801 (CH:27200 approx.)
> Length: 1300M (Approx.)
Section 2: CP: 801 (CH: 27200 approx.) to start of ramp (CH:28450 approx)
> Length: 1250M (approx.) - Ramp/Underground
Start of Ramp (CH:28450) to end of Design Limit (CH: 29400)
> Length: 950M (approx.)
![](https://themetrorailguy.com/wp-content/uploads/2020/06/KolkataMetroLine6AirportMap3.png)
Piling work for the elevated section had started in New Town in April 2021.
![](https://themetrorailguy.com/wp-content/uploads/2023/02/KolkataMetroLine6DWall1.jpg)
![](https://live.staticflickr.com/65535/52698581925_d333c6fac1_o.jpg)
![](https://live.staticflickr.com/65535/52698653018_db12f5b635_o.jpg)
Here’s my go-to video to demonstrate how D-walls are built to form the boundary wall of station boxes and cut & cover tunnels:
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– TMRG
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