Sabarmati River Bridge Completion Marks Major Bullet Train Milestone
The 480-metre Sabarmati River bridge for the Ahmedabad-Mumbai Bullet Train is now complete, marking a major milestone for the MAHSR project.
The ambitious Mumbai-Ahmedabad High-Speed Rail (MAHSR) project has reached a significant construction milestone with the successful completion of the 480-metre-long Sabarmati River bridge. This massive structure, a vital component of the Bullet Train corridor, is situated between the Sabarmati and Ahmedabad stations, positioned roughly 1 km from Sabarmati and 4 km from Ahmedabad.
A Towering Engineering Feat
Standing at a staggering height of approximately 36 metres—equivalent to a 12-storey building—the bridge is one of the most prominent structures in the Ahmedabad section of the corridor. Its height was strategically designed to provide necessary vertical clearance, as the bridge runs adjacent to the Western Railway’s Ahmedabad–Delhi main line, which sits about 14.8 metres above ground level.
The construction of the MAHSR alignment in Ahmedabad has been a complex task, requiring the project to navigate around existing infrastructure such as flyovers, metro corridors, and various railway lines. To accommodate these requirements, the piers for the Sabarmati River bridge were engineered with increased height to ensure sufficient clearance for all existing facilities.
Advanced Engineering and Design
The bridge is supported by eight circular piers, with diameters ranging from 6 to 6.5 metres. The placement of these piers was carefully planned to minimize disruption to the river's waterway:
- 4 piers are located directly within the riverbed.
- 2 piers are positioned on the riverbanks (one on each side).
- 2 piers are located outside the riverbanks.
While most river bridges along the Mumbai-Ahmedabad Bullet Train corridor typically feature shorter spans of about 40 metres, the Sabarmati River bridge utilizes much longer spans, ranging from 50 to 76 metres. This design choice significantly reduces the total number of piers required within the riverbed itself.
Precision Construction Techniques
The bridge consists of seven spans in total: five spans of 76 metres each and two spans of 50 metres each. Each span is composed of 23 segments that were cast in-situ at the construction site, a process requiring extreme precision engineering, skilled labor, and rigorous quality inspections at every stage.
Engineers utilized the Balanced Cantilever Method to complete the superstructure. This specialized technique is ideal for long-span bridges over deep waterways because it allows for construction without the need for conventional scaffolding beneath the deck. Instead, segments are erected sequentially from the piers and joined through post-tensioning, building out symmetrically on both sides of each pier to maintain stability and create a continuous deck.
Progress of the Corridor
The Mumbai-Ahmedabad Bullet Train corridor is expected to feature a total of 25 river bridges. The distribution is as follows:
- Gujarat: 21 river bridges planned (18 of which are now completed).
- Maharashtra: 4 river bridges planned.