Beginning of micro-tunnel works at Anand Vihar for the RRTS Delhi-Meerut corridor
New Delhi, India (Urban Transport News): The National Capital Region Transport Corporation (NCRTC) has started micro-tunnel works at its RRTS Anand Vihar station under construction prior to the construction of the tunnel for utility diversion works.
Keeping the convenience of the public in mind, the NCRTC chose a micro-tunnel technique to divert the existing interception sewer line from the Delhi Jal Board to the site of the Anand Vihar RRTS station. This intercepting sewer line encroached on the RRTS corridor at this location.
Micro-tunnel is a technique of building trenchless underground tunnels that is generally used for the construction of smaller tunnels for the diversion of utilities such as drainage pipes, etc. in order to minimize public inconvenience caused during construction.
It uses a Micro Drill Tunnel (MTMB) that follows the proposed bypass alignment using a guiding system and uses the pipe jacking method to lay the pipes behind the shield while moving forward.
A sewer line approximately 600 meters long and high capacity non-pressure concrete (NP-4) pipes 900 mm in diameter will be laid to a depth of approximately 6 meters below the ground surface.
The micro-tunnel is an efficient, fast and reliable way to install RCC or concrete pipes of different diameters under highways, railways, tracks, ports and environmentally sensitive areas without disturbing surface activities and the users.
It allows the free movement of the public in the area, therefore especially adopted in places where the frequentation is quite high and the digging of trenches is not advised because the extraction of debris causes the blocking of the passages restricting the movement of people. It is also very useful in preserving the existing infrastructure from any physical damage or alteration.
The Anand Vihar RRTS station site is one of the busiest suburban transit hubs with huge daily footfall, as it is surrounded by a metro station serving two metro lines, a train station and two ISBTs. – one in Delhi and the other in Kaushambi, CÃ´tÃ© HAUT.
Like all other NCRTC sites, here too when carrying out this work, the NCRTC takes all necessary measures to disrupt as little as possible the daily life of the public there. Because this construction is done in a barricaded area; a detailed study of the quality of the soil and of the state of the construction site was carried out before the start of the work and precautions are taken to avoid any atmospheric or noise pollution during construction.
In addition to providing a next-generation mobility solution in the National Capital Region (NCR), many basic public service infrastructures are also being built, upgraded or relocated by the NCRTC, which encroaches on the route of the RRTS corridor. The sewer interception line of this Delhi Jal Board is one of them. Residents of the NCR will benefit from this improved infrastructure for a very long time.
Construction activities at Anand Vihar, Delhi are in full swing with work on the launching shaft of the tunnel boring machine, measuring 20 m long and 16 m wide.
Two tunnel boring machines (TBM) will be lowered into the launch pit to dig twin RRTS tunnels from Anand Vihar to Sarai Kale Khan to build around 3 km of tunnels.
It will be the longest section of tunnel between two stations among the metro systems available in the country.