Prof. Ing. Mario Paolo Petrangeli(1), Ing. Angelo Vittozzi(2), Ing. Andrea Polastri(1), Ing. Dario Guerci(2)
(1)Mario Petrangeli & Ass. srl – Rome, Italy | (2) ITALFERR Spa Gruppo FS – Rome, Italy
In the indian region of Kashmire, close to the Himalayan mountains, an important cable-stayed railway bridge, with a main span of 290 m crossing the Anji valley 190 m above the river bed, is under construction; when completed it will become the first cable-stayed rail-way bridge ever built in India. Due to the particular orography of the valley, the bridge shall have an asymmetric structural scheme, with a 200 m high single tower and 20 m diameter well foundation. The bridge will have two cable plains, each one with 24+24 stays with a maximum length of 300 meters; for the upper part of the tower, where the stays anchor, a composite steel-concrete hollow section has been adopted. Two main steel truss beams 5 m high have been adopted for the bridge deck completed with deck truss metal sheetings and a concrete slab. Nowadays, the entire tower, the first phase of incremental deck launching of the rear span and more than half of the cable-stayed cantilever construction of the main span has been completed.
1 INTRODUCTION
Northern Railways of India is managing the construction of an approximately 300 km long railway line in the J&K State, India. This line has some segments with only one track and shall link Udhampur-Srinagar-Baramulla. The very difficult morphology of the area implies to bore many tunnels with a total length of about 90 km, and the construction of important bridges. One of these crosses the Anji River about 190 m over the bottom of the valley. A steel truss arch, spanning 260 m, was the initial structural solution; some piers of the approach viaduct were also erected. Anyway, the construction was stopped immediately after the beginning because of the difficulties faced to cut the sub-vertical slope on the left side of the valley. The extremely fractured and sheared rock was difficult to stabilize also with expensive works. For this reason, IRCON International Limited (a Government of India Undertaking under the Ministry of Railways) called for an international bid to prepare a new design and to supervise the construction works. The tender was assigned to the Italian Company ITALFERR with LoA dated April 2016, while the subsequent tender for Proof Checking was assigned to the Company COWI (UK). A new tender for construction was called on October 2016 based on a new Preliminary Design developed by Italferr, then assigned to the Indian Contractor HCC. The Construction works started on February 2017 and are currently in progress supervised by Konkan Railway Corporation Limited.[…]
Leggi l’articolo completo su Costruzioni Metalliche n. 1/2023