DELHI (Metro Rail News): Keeping public convenience in mind, NCRTC has chosen micro tunneling technique for diverting existing interceptor sewer line of Delhi Jal Board at Anand Vihar RRTS station site. This interceptor sewer line was infringing RRTS corridor at this location.
Micro tunneling is a trenchless underground tunnel construction technique generally used for constructing smaller tunnels for utilities diversion such as drainage pipelines etc. to minimize the public inconvenience caused during the construction.
It is using Micro Tunnel Boring Machine (MTMB) which follows the proposed diversion alignment with the help of a guidance system and uses pipe jacking method for laying the pipes behind the shield while moving forward.
About 600-meter-long interceptor sewer line of 900 mm diameter high capacity non-pressure (NP-4) concrete pipes will be laid at a depth of about 6 meters below the ground surface.
Micro Tunneling is an efficient, fast and reliable way for installing RCC or concrete pipelines of various diameters below highways, railroads, runways, ports and environmentally sensitive areas without disturbing the surface activities and users.
It allows free public movement in the area, therefore mostly adopted in places where footfall is quite high and trenching is not advisable as the extraction of debris cause blocking of passages restricting people movement. It is also very helpful for preserving existing infrastructure from any physical damage or alteration.
Anand Vihar RRTS station site is one of the busiest commuter transit hubs having a huge daily footfall, as it is surrounded by a Metro station serving two metro lines, a Railway Station and two ISBTs – one at Delhi side and the other one at Kaushambi, UP side.
Like all other NCRTC’s construction sites, here also during the execution of this work, NCRTC is taking all necessary measures to ensure minimum disturbance to the day-to-day life of public over there. For this construction is being done in a barricaded zone; a detailed study of soil quality and construction situation survey has been done before the start of the work and precautions are being taken to avoid any air or noise pollution during construction.
Apart from providing a next-generation mobility solution in the National Capital Region (NCR), many basic utility infrastructures are also being constructed, upgraded or relocated by NCRTC which are infringing the alignment of the RRTS corridor. This Delhi Jal Board’s sewer interceptor line is one amongst them. Residents of NCR will be benefitted from this improved infrastructure for a very long period of time.
The construction activities at Anand Vihar, Delhi is going in full swing with the work of launching shaft of tunnel boring machine, measuring 20 m in length and 16 m in width.
Two Tunnel Boring Machines (TBMs) will be lowered in the launching shaft to bore RRTS twin tunnels of 6.5 meter diameter from Anand Vihar towards Sarai Kale Khan to construct around 3 km of tunnels.
It will be the longest tunnel section between any two stations amongst the available Metro Systems in the country.