The 1,405-tonne span was built at a workshop in Tiruchirappalli and hauled 1,300 kilometres before being slotted over a busy Thane highway during a night shutdown.
The Mumbai-Ahmedabad High-Speed Rail project just crossed a real physical milestone. Engineers with the National High Speed Rail Corporation Limited launched a 100-metre steel bridge over NH-3, the Mumbai-Nashik Highway, near Dive-Anjur village in Bhiwandi on Monday. It's the first steel bridge for the corridor to be completed anywhere in Maharashtra.
The numbers alone tell you why this took planning. The bridge weighs 1,405 metric tonnes and stands 14 metres high and 14 metres wide. It was fabricated roughly 1,300 km away, at a workshop in Tiruchirappalli, Tamil Nadu, then moved to Bhiwandi on heavy-duty trailers built for exactly this kind of load.
At the site, workers assembled the structure on temporary trestles set at a height of about 17.5 metres. That job alone involved 22 skid arrangements and 54,076 Tor-Shear Type High Strength Bolts, which is not a number you round off. Once assembled, the bridge got shifted into its final position using two hollow jacks rated at 150 metric tonnes each, with pre-tensioned Macalloy bars and an automatic pulling mechanism keeping the movement controlled.
The whole launch happened at night, during a traffic block, so the highway wouldn't seize up during daylight hours. Given that NH-3 is one of the busier stretches connecting Mumbai to Nashik, that timing wasn't optional.
Built to last, built to move fast
There's a quality-control layer here too. Every batch of steel used in fabrication went through ultrasonic testing, and the welders and supervisors on the job carried certification from international welding experts. For durability against wear and vibration, the bridge has a C5 protective coating and elastomeric bearings, the kind of detail that matters when a train is meant to run at high speed for decades.
Steel bridges get used specifically where the corridor needs to clear highways, expressways, rivers or railway lines in one long, unbroken span rather than multiple piers breaking up the ground below. Across the entire Mumbai-Ahmedabad route, 28 such steel bridges are planned. Sixteen have now been completed, and the Bhiwandi structure is the one that finally gets Maharashtra on the board.
The corridor is also expected to use movable, or swing-nose, crossings at high-speed turnouts, letting trains run up to 320 kmph without the rail gap that comes with fixed crossings. That's a separate piece of engineering, but it points to the same thing: this project is still in its heavy construction phase, with fabrication happening in one state and assembly in another.
No fresh timeline has been announced for when the Maharashtra stretch as a whole gets operational. But with steel bridges from Tamil Nadu now showing up over Thane highways at 2 in the morning, the corridor is visibly, physically moving, one 1,405-tonne piece at a time.
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