The Mumbai-Ahmedabad Bullet Train project marks a significant achievement with the completion of a 210-metre long PSC bridge over NH-48 in Navsari, Gujarat. Additionally, the construction of India’s first 7 km undersea tunnel as part of a 21 km stretch in Maharashtra progresses rapidly, showcasing advanced tunnelling techniques.
Bridge Completion Over NH-48:
A 210-metre long PSC bridge over NH-48 at Sisodra village, Navsari district, has been completed for the Mumbai-Ahmedabad Bullet Train corridor. This marks the second bridge completed using the Balanced Cantilever method over a highway, comprising 72 precast segments with a span configuration of 40m + 65m + 65m + 40m.
Strategic Location & Construction Details:
Situated between Bilimora and Surat Bullet Train stations, the bridge is an essential infrastructure crossing over the busy NH-48, connecting Delhi and Chennai through Gujarat and Maharashtra. Constructed with meticulous planning, the bridge enables uninterrupted travel on one of India’s busiest highways while facilitating the bullet train’s elevated viaduct.
Update on 21 km Tunnel & Undersea Section:
The 21 km tunnel stretch between Mumbai and Shilphata includes India’s first 7 km undersea tunnel at Thane creek. Of the total tunnelling work, 16 km is being executed using Tunnel Boring Machines (TBMs), while 5 km utilises the New Austrian Tunneling Method (NATM), ensuring a robust and secure passage.
Progress on Key Tunnel Sites:
Several key sites show advanced progress: Shaft 1 at Mumbai HSR station is under excavation, Shaft 2 in Vikhroli is 92% excavated, Shaft 3 in Sawli is fully excavated and prepares for TBM lowering. Shilphata, the NATM endpoint, has completed portal work and 200-metre excavation.
ADIT Tunnel & Instrumentation Monitoring:
The ADIT tunnel, completed in a record six months, facilitates NATM work and serves as a crucial access point for the main tunnel construction. Various geotechnical instruments like inclinometers, vibration monitors, and tilt metres ensure safety during construction, monitoring for any potential risks to surrounding structures.
Conclusion:
The Mumbai-Ahmedabad Bullet Train project makes remarkable strides with the completion of the NH-48 bridge and ongoing tunnel construction. The use of advanced technologies, combined with safety monitoring, ensures efficient progress toward the high-speed rail corridor that will transform travel in India.
Source: NHSRCL – Press Release | Images Credit: NHSRCL
