---
title: Chennai Phase 1 Ext Project ​
url: "https://www.systra.com/india/project/chennai-phase-1-ext-project/"
type: projects
date_published: 2022-11-14
date_modified: 2026-02-28
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canonical: "https://www.systra.com/india/project/chennai-phase-1-ext-project/"
featured_image: "https://www.systra.com/india/wp-content/uploads/sites/8/2022/10/chennai-metro-featured-photo.png"
type-market:
  - Infra
type-service:
  - "Consulting & Advisory services"
  - Design and Engineering
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  - Infra
---

# Chennai Phase 1 Ext Project ​

![Chennai Phase 1 Ext Project ​](https://www.systra.com/india/wp-content/uploads/sites/8/2022/10/chennai-metro-featured-photo.png)

**The Chennai Metro serves the city of Chennai, Tamil Nadu, India. It is the fourth-longest metro system in India, behind Delhi, Hyderabad, and Bangalore. The network consists of two color-coded wires spanning 54.65 km.​**

The Phase 1 Ext Project which is of total length 9.051 km was awarded to SYSTRA
in August 2015 by Chennai Metro Rail Corporation. The Project consist of 2.4 km
of underground stretch with 2 underground stations, 6 elevated stations and a
depot for which SYSTRA was responsible for the detailed design of the
Architectural, Civil, Structural, and Building Services Works.​

Construction began in July 2016 following the approval from the Central
government. The Project was successfully commissioned for revenue service on
February 14, 2021 which was inaugurated by Prime Minister Narendra Modi.​

## Key features of the project

- General Construction Method for U-Girder Lifting and Installation Viaducts are
  included in the Tender Drawings that must be adopted by the Contractors in
  order to build a detailed scheme which minimizes or eliminates the danger of
  significant accidents. According to the self-weight, PT strand has been
  specified as the type of lifting hook/bar for the U-Girder span
  ​
- In underground stations, our Technical teams designed TVS Fans vertically to
  reduce station box and land acquisition, a unique feature in India. This
  design adjustment led to a 150 m station box, far smaller than our usual
  underground stations in India till date
- The functional cross-section of the U-Girder has been finalized based on the
  minimal clearances specified in the dimensions schedule (SOD)
- The launching span for U-Girders has been positioned close to the casting yard
  to save transportation distance. All U-girders will be erected from a single
  location, i.e., the launching span, minimising the risks associated with 
  erection.
- The arrangement of the spans at the crossings has been determined by
  considering the minimal turning radius of the corresponding vehicles in order
  to eliminate the chance of a collision with the pier column
- Tunnel cross section has internal diameter of 5800mm and external diameter of
  6350mm
  ​
- Two Tunnel bores are separated by 14m between Centre to Centre of Tunnels​
- A walkway runs along the entire length of the tunnel provided egress in the
  event of an emergency