Ahmedabad-Mumbai Bullet Train: Sabarmati River Bridge Completed
The Mumbai-Ahmedabad Bullet Train project has reached a massive milestone with the successful completion of the 480-metre-long bridge over the Sabarmati River. This significant structure is a vital link in the high-speed rail corridor, situated between the Sabarmati and Ahmedabad Bullet Train stations.
The bridge is strategically located approximately 1 km from the Sabarmati station and 4 km from the Ahmedabad station. Standing at a height of roughly 36 metres—comparable to a 12-storey building—it is one of the most prominent structures within the Ahmedabad segment of the corridor. It runs adjacent to the existing Western Railway’s Ahmedabad–Delhi main line, which sits at approximately 14.8 metres above ground level.
Engineering a High-Altitude Marvel
Because the MAHSR alignment in Ahmedabad must cross various existing infrastructure, including metro corridors, flyovers, and existing railway lines, the design required careful consideration of vertical clearances. To accommodate this, the piers of the Sabarmati River bridge were engineered with increased height.
The bridge is supported by eight massive circular piers, with diameters ranging between 6 and 6.5 metres. The placement of these piers was carefully planned to minimize obstruction to the river's waterway:
- 04 piers are located within the riverbed.
- 02 piers are positioned on the riverbanks (one on each side).
- 02 piers are located outside the riverbanks.
While most river bridges along the Mumbai-Ahmedabad Bullet Train corridor utilize shorter spans of around 40 metres, the Sabarmati River bridge employs much longer spans ranging from 50 to 76 metres. This design choice allowed engineers to reduce the total number of piers required within the riverbed itself.
Precision Construction via Balanced Cantilever Method
The bridge architecture consists of five spans of 76 metres each and two spans of 50 metres each. Each individual span is composed of 23 segments that were cast in-situ at the construction site, requiring extreme precision and rigorous quality checks.
To build this structure, engineers utilized the Balanced Cantilever Method. This specialized technique is ideal for long-span bridges over deep waterways because it allows for the construction of the superstructure without the need for traditional scaffolding underneath the deck. Instead, the segments are sequentially erected from the piers and joined through post-tensioning, with construction moving outward from either side of each pier to create a stable and continuous bridge deck.
Rapid Progress on the Gujarat Corridor
The Mumbai-Ahmedabad Bullet Train corridor is designed to feature a total of 25 river bridges. The distribution of these bridges is as follows:
- 21 bridges are located within the state of Gujarat.
- 04 bridges are located within Maharashtra.
Construction is progressing swiftly in Gujarat, where 18 of the 21 planned river bridges have already been successfully completed.