Vidyasagar Setu

22.55694444444488.327777777778Koordinaten: 22 ° 33 ' 25 "N, 88 ° 19' 40" E

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Vidyasagar Setu ( Bengali: বিদ্যাসাগর সেতু, Bidyāsāgar setu; German: Vidyasagar Bridge, commonly known as the Second Hooghly Bridge in English and in the literature ) is a road bridge over the river Hooghly ( Hooghly ), a tributary of the Ganges in the Indian state of West Bengal.

It connects the city of Calcutta (since 2001: Kolkata ) with the opposite, more than one million population city Howrah. The two cities were - apart from the lying far to the north Vivekananda Setu - connected only by the Howrah Bridge until the Second Hooghly Bridge was opened in 1992. Officially it was Ishwar Chandra Vidyasagar named after, a reformer in Bengal in the 19th century.

She was the first cable-stayed bridge in India and has the longest span of all bridges in India.

It is a toll road for motor vehicles.

History

The rapid growth of the two cities and the frequent traffic jams on Howrah Bridge required the construction of a new river crossing. Early in 1970, was commissioned with the planning of the second bridge over the Hooghly Jörg Schlaich of the Government of West Bengal. Criterion was that the bridge would be built without any imports only from local, non-weldable steel of local workers.

Schlaich developed the design of a cable-stayed bridge with a road carrier of riveted longitudinal and cross members in conjunction with a concrete deck slab. The material required for the bridge could weren obtained from Indian steel producers and suppliers of building materials, the extensive rivet and concreting were for many local workers familiar activities that could be carried out with a lot of manual work.

The foundation stone for the second bridge over the Hooghly was laid on 20 May 1972 by Indira Gandhi, the actual construction work began, however, until 1979. Execution planning and construction supervision was taken over by Schlaich, which was founded shortly thereafter Schlaich Berger and Partner. As test engineers Freeman Fox & Partners were engaged, wind tunnel tests were conducted by the Indian Institute of Science, Bangalore. Construction work Braithwaite, Burn & Jessop Construction Co. was commissioned, a 1987 bridge nationalized companies from Calcutta. The work was repeatedly obstructed and interrupted by coordination problems, strikes of more than ten different unions and ultimately funding problems. But It was proven that the method, I-beams to connect with rivets, which were heated on charcoal grills, at least could not be hindered by the daily power outages.

The bridge was inaugurated after nearly 13 years of construction on 10 October 1992.

She wears compared to the Howrah Bridge little traffic, which is attributed in part to the bridge toll.

Description

Vidyasagar Setu The total is a 823 m (2700 ft) long and 35 m ( 115 ft ) wide six-lane road bridge, the carriageways are separated by a 1.7 m wide median strip with guardrails. The two 2.50 m wide sidewalks are located outside of the stay cables. The main opening of the bridge has a span of 457.2 m (1500 ft ), the two Seitenöffnunngen of each 183 m (600 ft). There are also long approach viaducts, thread the traffic from the bridge in various urban motorways. The bridge in the middle of a clear height of 26 m (85 ft).

Construction

Vidyasagar Setu is a zweihüftige The cable-stayed bridge, the ropes are arranged in the fan system and are supported by two H pylons.

The pylons are made on request of the client is not made ​​of concrete, but of riveted steel girders with a cross section of 4 x 4 m. The freestanding portals are connected to each other below the bridge deck and below the pylon tips by cross bars. Manufactured from parallel wires stay cables are firmly connected to the bridge deck; they were excited by devices in the pylon heads.

The bridge deck consists of three continuous 2 m high I-beams with center distances of 14.55 m each, all of which 4.10 m are connected by equally high cross member on average. Outside are 2.95 m long cantilevers for walkways attached. The rust formed thereby is connected with the outer longitudinal members directly to the ropes, the central longitudinal beam is used for load distribution. The rust was created by the pylons starting cantilevering from the delivered ships with carriers. On the rust, a 0.23 m thick and 35 m wide reinforced concrete slab was simultaneously made ​​in-situ concrete to stiffen the structure and as a basis for the roadway and anchored to the steel girders with four fields overrun.

This composite system was adopted in 1983-1986 built Alex Fraser Bridge ( Annacis Bridge ) in Metro Vancouver, Canada and used by Schlaich Berger and Partner at the Ting Kau Bridge in Hong Kong in a developed form.