Underground construction work begins for the RRTS Delhi-Meerut project

New Delhi, India (Urban Transport News): Construction of the launch pit started today at Anand Vihar, Delhi for the digging works. The first diaphragm wall panel reinforcement cage (D-Wall) with a size of approximately 20 m in depth (equal to the height of a 10-story building) and 5 m in width was lowered and concreted . With this milestone, the construction of the underground section for RRTS has entered the next stage.

The D-wall acts as a shield or frame to balance the pressure of the earth, thus reducing the possibility of soil collapse and also preventing water infiltration during excavation.

This launch pit is 20m long and 16m wide, located south of the Anand Vihar underground RRTS station. Two tunnel boring machines (TBM) will be lowered into this shaft to dig the twin RRTS tunnels from Anand Vihar to Sarai Kale Khan.

The total distance of these two TBM machines will be approximately 3 km. It will be the longest section of tunnel between two stations among the metro systems available in the country. A ventilation shaft will be built between this large section connecting the two sides of the tunnels, to ensure the safety of passengers in the event of an emergency. An emergency passenger evacuation facility is also under construction to facilitate the safe exit of passengers from the tunnels, in a rare event requiring evacuation.

At the same time, construction of the launching shaft for the northern tunnel will soon start to dig twin tunnels over 2 km long from Anand Vihar to Meerut.

These tunnels will have a larger diameter than the country’s metro systems due to the larger rolling stock and higher design speed of 180 km / h in the case of the RRTS. The free inside diameter of these tunnels is 6.5m to reduce air pressure and passenger discomfort, due to the generation of shock waves in the tunnels due to the higher speed of these trains.

The NCRTC team is doing their best to make up for lost time due to the impact of the second wave of COVID-19 restrictions on construction activities and supply chains. security protocols compliant with COVID SOPs.

Bonny J. Streater

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