Ponte Rodoviária do Estreito

Coordinates: 6 ° 33 ′ 36 "  S , 47 ° 27 ′ 35"  W

Ponte Rodoviária do Estreito
Official name	Ponte Juscelino Kubstichek de Oliveira
Crossing of	Rio Tocantins
place	Estreito - Aguiarnópolis
construction	Prestressed concrete - box girder bridge
overall length	533 m
width	10 m
Number of openings	17th
Longest span	140 m
completion	1960
planner	Sergio Marqués de Souza
location

The Ponte Rodoviária do Estreito , officially the Ponte Juscelino Kubitschek de Oliveira, also known as the Rio Tocantins Bridge , spans the Rio Tocantins and connects the two communities of Aguiarnópolis ( Tocantins ) and Estreito ( Maranhão ) in Brazil .

It is part of the Rodovias BR-230 (Transamazônica) and BR-226 .

Almost 200 m downstream there is a single-track railway bridge , including its approach bridges, 1280 m long with 390 m long steel truss girders , which is simply called Ponte Ferroviária de Estreito .

About 3 km upstream is the UH Estreito (Usina Hidrelétrica Estreito) dam , which was completed in 2011 and opened in 2012, with a hydroelectric power plant with a nominal output of 1087 MW.

description

The two-lane bridge is a total of 533 m long and 10 m wide. The main opening is 140 m wide, the two side openings 53 m each. Foreshore bridges with 5 or 9 openings are connected on both sides in order to achieve the required clearance height of the bridge of 10 m above the flood in the flat environment .

The superstructure of the main bridge consists of a haunched two-cell prestressed concrete - box girder with a cantilevered carriageway slab, which was executed according to the Freyssinet system . Its overall height decreases from 8 m at the pillars to 3.4 m at the central joint. The approach bridges have 20 m wide reinforced concrete slabs

The river pillars have a cross section of 1.4 m × 7 m. The outer pillars of the main bridge have reinforced foundations; they act as anchors and counterweights.

history

When Brasília was built, the new capital of Brazil was to be connected to major cities, including Belém . The construction of the approximately 2200 km long road went through partly unknown land. One of the biggest problems was crossing the Rio Tocantins. From the plane, a bottleneck was found that was suitable for building bridges. The river at this point is 130 m wide and at least 45 m deep. The construction site was 100 km from the nearest town and 700 km from Belém.

The bridge was designed by Sergio Marqués de Souza, who was based on the Ponte Emílio Baumgart , the first cantilever bridge in the world, and executed by his own company

The side openings were built with falsework , the main opening was then created using the cantilever arch.

It was inaugurated in 1960. It was the world's largest prestressed concrete bridge until it was replaced by the Rhine Bridge in Bendorf in 1965 .

literature

• Prade, Marcel (1990): Les grands ponts du monde: Hors d'Europe. Brissaud, Poitiers (France), p. 180 (French)
• Augusto Carlos de Vasconcelos, Gilson L. Marchesini, Júlio Timerman: Bridge Engineering in Brazil: Estreito Bridge over the Tocantins River . In: Wai-Fah Chen, Lian Duan (Eds.): Handbook of International Bridge Engineering . CRC Press, Boca Raton 2014, ISBN 978-1-4398-1029-3 , pp. 190 ( limited preview in Google Book Search). (English)
• PE Mondorf: Puentes de hormigón pretensado construidos por voladizos sucesivos . In: Hormigón y acero , v. 17, n. 78 (1st quarter 1966), pp. 76–105 (p. 78 in PDF; 4.3 MB) (Spanish)

Individual evidence

1. ↑ Rio Tocantins Bridge. In: Structurae
2. ↑ CESTE - Consórcio Estreito Energia ( Memento of the original from March 6, 2017 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. 
3. ↑ Leonardo Fernández Troyano: Bridge Engineering. A global perspective. Colegio de Ingenieros de Caminos, Canales y Puentes, Thomas Telford, London 2003, ISBN 0-7277-3215-3 , p. 422