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Delhi-Ghaziabad-Meerut RRTS Corridor Records First Tunnel Breakthrough at Meerut | Metro Rail Today

By on October 22, 2022 0

Meerut, India (Metro rail Today): The Delhi-Ghaziabad-Meerut corridor of India’s first RRTS witnessed the first tunnel breakthrough at Meerut on 22 October 2022. Sudarshan 8.3 (TBM) made a breakthrough from the tunnel at Begumpul RRTS station.

Mr. Vinay Kumar Singh, MD, NCRTC, initiated the breakthrough by pressing a button remotely in the presence of directors and other senior NCRTC officials. The Sudarshan 8.3, Tunnel Boring Machine (TBM), was lowered to the launch pit constructed at Gandhi Park and will now be recovered from Begumpul RRTS station. This was achieved within 4 months of the completion of the drilling and the formation of a 750m long tunnel.

This is the first tunnel training made by Sudarshan 8.3. The same TBM will also build the parallel tunnel. Therefore, the TBM will be dismantled in the shaft and its cutter head and shield will be brought back to the Gandhi Park launch shaft on trailers. The emergency gantry or the rest of the parts of the tunnel boring machine will be returned from the tunnel itself. Once it reaches the launch pit, it will then be re-launched.

Meanwhile, two more Sudarshans, 8.1 and 8.2, are drilling 1.8 km long parallel tunnels between Bhaisali and Football Chawk.

The Begumpul RRTS station is built using a top-down technique, in which the station is built from top to bottom with deep excavations. This station has three levels: mezzanine, hall and platform. The mezzanine and concourse level of this station have been completed and construction of the platform level is currently underway.

To build this 750 m long tunnel, more than 3,500 prefabricated segments were used. In the tunneling process, these segments are inserted and seven segments are combined to form a ring. Each segment is 1.5m long and 275mm thick. These segments and rings are connected using bolts. The tunnel segments are cast at the NCRTC casting yard in Shatabdi Nagar with quality control assured. Prefabrication contributes to the safe and rapid execution of works while ensuring good quality control, minimizing inconvenience to road users, local passers-by, business owners and residents throughout the section, and reducing air pollution and noise pollution.

Due to the larger rolling stock and a high design speed of 180 km/h, the diameter of the RRTS tunnels under construction is 6.5 m. Compared to subway systems, this is the first time a tunnel of such a size has been built in the country.

Speaking on the occasion, Vinay Kumar Singh, Managing Director of NCRTC, said, “The first breakthrough of Sudarshan 8.3 is an important milestone in the implementation of the RRTS project. Building such an infrastructure project in a historic and congested town like Meerut is a huge challenge and involves complex logistical management. Tunneling under the existing city is a dangerous activity and requires careful planning. It is thanks to the support of UP government officials and the perseverance and hard work of the NCRTC team, general consultants, designers and our contractors that this huge project is being implemented at a rapid pace without too much inconvenience for the inhabitants of Meerut. I commend all the engineers and dedicated workers who made this possible. »

The project is being implemented according to schedule. To speed up the process, a parallel construction was underway, where on the one hand, the launch pit was being built; on the other, segments of the ring were prefabricated in the casting yard. Also at the same time, the FAT (Factory Acceptance Test) verification of the tunnel boring machine was underway and parts of this state-of-the-art machine were brought to site. It is thanks to foresight and premeditated efforts that the project comes at the right time, despite two waves of the pandemic.

Meerut Central, Bhaisali and Begumpul are the metro stations of Meerut, of which Meerut Central and Bhaisali are the Meerut metro stations while Begumpul station will serve as both RRTS and metro. The NCRTC will provide local public transport services, Meerut Metro, on the RRTS network itself in Meerut with 13 stations over a distance of 21 km for local transport needs.