The Bullet Train project is surging ahead with remarkable speed, as evidenced by the recent milestone achieved by the National High-Speed Rail Corporation Limited (NHSRCL). A significant advancement took place with the launch of a 100-metre steel bridge over the Vadodara-Ahmedabad main line of Indian Railways near Nadiad in Gujarat.
More Details:
The first steel bridge of 100 m length, launched over Vadodara-Ahmedabad main line of Indian Railways near Nadiad in Gujarat for Bullet Train project under the Mumbai- Ahmedabad Bullet Train Corridor. Along with Japanese know-how, India is increasingly utilising its indigenous technical and material capabilities to build the infrastructure under “Make-in-India” vision. And, this Steel bridge for the Bullet Train project is one of such examples.
Assembled and Installation:
- This 1486 MT of steel bridge has been fabricated at the workshop in Bhuj district of Gujarat, which is almost 310 km away from the location of bridge launching site and was transported on trailers to the site for installation.
- At the site, the steel bridge was assembled at a height of 15.5 metre from the ground on temporary trestles.
- Thereafter, the launching nose of 63 m in length and approx. 430 MT weight was assembled with the main bridge assembly.
- The steel bridge was pulled with an automatic mechanism of 2 numbers of jacks, each of 180 MT using High Tension strands.
- The bridge was pulled in complete traffic and power blocks of Indian railway lines with meticulous planning and precision.
Technical Points:
- Length of the main bridge: 100 metres
- Weight of the main bridge: 1486 MT
- Launching nose length: 63 metres
- Launching nose weight: 430 MT
Each production batch of steel was tested by Ultrasonic Testing (UT) at the manufacturer’s premises. The making of steel bridges undergoes high-tech and precise operations of cutting, drilling, welding and painting as per the design drawings prepared by Japanese engineers.
The welders and supervisors were certified by International Welding Experts. The welding process is monitored by Japanese International Welding Experts (IWE) stationed at each workshop. Fabricated structure undergoes Check Assembly process and then follows the sophisticated 5- layered painting of the steel structure.
The painting technique adopted for the steel girders is first-of-its-kind in India. It conforms to the C-5 Painting system of Japan Road Association’s “Handbook for Corrosion Protection of Steel Road Bridges”. The jointing of steel members is done using Tor-Shear Type High Strength Bolts (TTHSB), which are being used for the first time for any railway projects in India.
Specification of the Bridges:
- This is the second out of the 28 steel bridges completed for the corridor. The first steel bridge was launched across National Highway 53, Surat in Gujarat.
- Approximately 70,000 MT of specified steel is used in making these steel bridges. The length of these steel bridge spans varies from 60 metre ‘simply supported’ to 130 + 100 metre ‘continuous span’.
- Steel bridges are most suitable to cross Highways, Expressways and Railways lines, unlike prestressed concrete bridges, spanning 40 to 45 metres, which are suitable for most sections, including river bridges.
- India has the expertise of fabricating steel bridges for heavy haul and semi high-speed trains which run between 100 and 160 kmph.
- Now, the same expertise in fabrication of steel girders will be implemented on the MAHSR corridor too which will have a staggering operational speed of 320 kmph.
Conclusion:
The successful launch of the steel bridge near Nadiad shows India’s dedication to modernising its transportation infrastructure. With innovation, collaboration, and a steadfast focus on quality, the Bullet Train project continues to forge ahead, promising a transformative impact on the nation’s connectivity and economic growth.
Source: NHSRCL – Press Release | Images Credit: NHSRCL
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