The first 40-meter full span prestressed concrete box girder (PSC) was erected today at a casting yard in the Navsari district of Gujarat, on the next high-speed rail corridor between Mumbai and Ahmedabad.
The National High Speed Rail Corporation Limited (NHSRCL) – responsible for the development, execution and maintenance of the high speed train project, said in a statement today that the full span box girder of 40 meters weighing around 970 MT, involving 42 MT of steel was cast in one piece – without any construction joints on November 1, 2021.
NHSRCL erects first 40m full span box girder for Mumbai-Ahmedabad high-speed rail corridor https://t.co/MRDxr6O62f#Constructionupdate#MAHSR#BulettrainIndia@RailMinIndia@AshwiniVaishnawpic.twitter.com/eIQnHlIw99
– NHSRCL (@nhsrcl) 25 November 2021
It is also the heaviest prestressed concrete box girder in the country’s construction industry. To accelerate the construction of the viaduct of the country’s first high-speed train corridor between Mumbai and Ahmedabad, the NHSRCL is adopting the full-span launch method.
The prefabricated beam was retrieved from the stacking yard by the straddle carriage and was moved to the predefined location from where it was lifted by the bridge gantry for final assembly. The full span beam was then placed between the “P11” and “P12” piers of the high speed rail corridor. The height of the pillars is 13.4 meters from ground level, according to the NHSRCL.
To speed up the construction of the viaduct, the development of the substructure and the superstructure were undertaken in parallel. Substructure work – piles, pile cap, pier and pillar cap, is in progress. For the construction of the superstructure, casting sites were arranged along the route to cast the full span beams and segmental beams.
23 casting sites are being developed along the route for the casting of full span beams of 30, 35 and 40 meters. Each casting yard is spread over an area of 16 to 93 acres as needed and is located near the high-speed train line-up.
Facilities such as jigs for the fabrication of rebar cages, casting beds with prefabricated hydraulically operated molds, concrete batching plants, aggregate stacking area, cement silos and camps working methods have been developed in each casting site to speed up the casting of beams.
The 508 km long Mumbai-Ahmedabad high-speed train corridor will cover 12 stations along its route and cut travel time between the two major cities to two hours and 57 minutes, including stops at all stations . When ready for services, the bullet train will operate at a speed of 320 km / h and will be similar to the Shinkansen or the Japanese bullet train.