Navasari, India (Urban Transport News): The project team of Larsen & Toubro (L&T) and National High Speed Rail Corporation Limited (NHSRCL) today fabricated the first full span Pre-stressed Concrete (PSC) box girder of 40 meters span at a casting yard in Navsari district of Gujarat. Satish Agnihotri, Managing Director, NHSRCL; Miyamoto Shingo, Minister (Economic and Development), Embassy of Japan in India; Saito Mitsunori, Chief Representative, JICA India Office; SV Desai, Director, L&T and Rajendra Prasad, Director (Projects), NHSRCL.
This 40 meter full span box girder weighing approximately 970 metric tons, consisting of 390 cubic meters of concrete and 42 metric tons of steel, was cast on 1 November 2021 in one piece without any construction joint. It is also the heaviest PSC Box Girder in construction. Industry of India. To expedite the construction of the viaduct for the Mumbai-Ahmedabad High Speed Rail Corridor, NHSRCL is adopting the full span launching method.
The precast girder was raised from the stacking yard by a straddle carrier and moved to a predetermined position from where it was raised by a bridge gantry for erection. It is a technical process that requires a high degree of accuracy and expertise. The 40 m full span girder was then placed between Piers P11 and P12 on Chainage 238 of the MAHSR Corridor. The height of the piers is 13.4 m above ground level.
Substructure and superstructure have been constructed in parallel to expedite the construction of the viaduct. While the work of substructure i.e. pile, pile cap, pier and pier cap is in progress, for superstructure, casting yards with alignment have been developed to cast full span girders and segmental girders so that they can be launched using heavy machinery. To be. Pier caps inserted.
Twenty three (23) casting yards are being developed along with the alignment. For casting of full span girders of 30, 35 and 40 metres. Each casting yard is spread over an area of 16-93 acres as per requirement and is located near high-speed rail alignment. The casting yard and heavy machinery for launching have been planned in a way to meet the extreme requirement of superstructure casting and erection.
Facilities like jigs for making rebar cages, hydraulically operated pre-fabricated molds with casting beds, batching plants, aggregate stacking areas, cement silos and labor camps have been developed at each casting yard for speedy casting of girders with quality Huh.
The Mumbai Ahmedabad High-Speed Rail Project (MAHSR) is 508 km long. Out of 508 km, 352 km lies in the state of Gujarat (348 km) and Dadra and Nagar Haveli (4 km) and the remaining 156 km lies in the state of Maharashtra. Civil contracts for 343 km out of 352 km have already been awarded. M/s L&T is the executing agency for 325 km length through two packages i.e. C4 (237 km) and C6 (88 km).