A Rodovia Nacional 44 (NH 44) é a rodovia mais longa da Índia, abrangendo 3.745 km de Srinagar a Kanyakumari.

Com o passar do tempo, as cidades próximas à rodovia expandiram-se a tal ritmo que os bairros adjacentes à rodovia cresceram em números muito significativos.

Como resultado, os pedestres e veículos leves ao longo dos dois lados da estrada muitas vezes afetam o fluxo e a velocidade dos veículos pesados de longo percurso. Também representa um grande risco para os veículos locais mais leves e os pedestres.

Para resolver este problema, a Autoridade Rodoviária da Índia propôs que o alargamento da estrada fosse acoplado a viadutos sobre o trecho onde a rodovia passa por cidades densamente povoadas.

O trecho elevado de rodovia de 34 km na área de Nagpur-Hyderabad está sendo construído para melhorar a rede rodoviária entre Nagpur e a capital, Hyderabad.

As autoridades selecionaram uma tecnologia de construção segmentada para as pontes elevadas, e cada segmento pesado foi moldado no ambiente de qualidade controlada dos pátios pré-moldados.

Considerando o tamanho substancial destes segmentos pré-moldados, foi necessário adquirir material de elevação fácil de usar, capaz de suportar cargas elevadas.

As barras totalmente roscadas laminadas a quente Dextra foram as que melhor se adequaram a esses requisitos.

Mais de 100 conjuntos de barras de pós-tensionamento totalmente rosqueadas (FT) para içamento e lançamento de segmentos pré-moldados com viga de lançamento foram fornecidos para este projeto, juntamente com acessórios como porcas de extremidade e acopladores.

Os sistemas Dextra FT Bar são frequentemente usados para aplicações temporárias, como levantamento de peso e costura de elementos pré-moldados e ancoragem de suportes de estruturas de aço.

No caso de aplicações permanentes, as barras FT podem ser utilizadas para a ligação de vigas e pilares na construção de pontes segmentadas.

A Ponte Temburong, também conhecida como Ponte Sultão Haji Omar Ali Saifuddien, está localizada na Baía de Brunei, no nordeste do país. Com 30 quilômetros de extensão e quatro pistas, é uma das pontes marítimas mais longas do mundo.

A ponte conecta Sungai Besar e Mengkubau. Permite aos passageiros viajar entre os dois territórios sem atravessar a Malásia, evitando os quatro postos de controlo de imigração na rota actual, que está frequentemente congestionada.

A Dextra se envolveu neste projeto fornecendo 34.000 metros lineares de tubos Sonitec para o teste de integridade de estacas de fundação usando o método de teste CSL (crosshole sonic logging).

A construção da ponte começou em 2014 e foi oficialmente aberta ao tráfego em 2020.

Fonte das imagens: https://www.reduper.com/industry/traffic/bridge/sea-bridge/temburong-bridge/

O corredor elevado Barapullah é um grande projeto de infraestrutura na Índia. O principal objetivo desta extensão é aliviar o congestionamento do tráfego, bem como fornecer uma nova conectividade expressa entre o Aeroporto Internacional Indira Gandhi e o leste de Delhi.

Reforço da estrada elevada com barras PT

Para a construção deste viaduto, a Dextra tem fornecido suas barras PT totalmente rosqueadas, bem como sua conhecida solução de emenda de vergalhões Bartec para a empreiteira L&T Construction.
Os sistemas de barras PT foram aplicados em aplicações temporárias do projeto de construção. Atualmente, barras de pós-tensionamento totalmente rosqueadas Dextra estão sendo utilizadas para içar e lançar os elementos pré-moldados das estruturas elevadas da via expressa.

O projeto da Ponte Atlântica, também chamada de Terceira Ponte sobre o Canal, está sendo desenvolvido próximo à entrada do Canal do Panamá no Oceano Atlântico. Este projeto $600M consiste na construção de uma ponte estaiada com 1 quilómetro de extensão, juntamente com viadutos de acesso em ambos os lados e ligações às vias existentes, bem como vias pedonais e cicláveis. Quando arquivada, a ponte permitirá que veículos cruzem o Canal do Panamá mesmo quando as eclusas estiverem em operação.

Uma das pontes estaiadas de concreto mais longas do mundo com a Bartec

Com um vão central de 530 metros e um vão vertical de 75 metros acima do nível do mar que permite a passagem de navios Post-Panamax, a Ponte Atlântica de quatro pistas é uma das pontes estaiadas mais longas do mundo. É também sustentado por dois pilares principais em forma de delta, atingindo 212,5 metros de altura.
Dextra América Latina, com sede na Cidade do Panamá, esteve envolvida no fornecimento de seus solução de emenda de vergalhões Bartec para o reforço da estrutura de concreto da ponte.

Mais de 350.000 acopladores Bartec foram entregues à empreiteira VINCI Construction Grands Projets para o reforço das gaiolas, blocos e pilares da ponte para barras de até #14 (diâmetro 43 mm). Além disso, três conjuntos de máquinas Dextra Bartec foram usados para apoiar a preparação das extremidades da barra no local.
Além disso, para evitar o congestionamento do aço nas áreas fortemente reforçadas, mais de 50.000 âncoras finais Dextra Barras com cabeça são usados nos blocos de estacas da ponte.

A ponte Atlântica está agora em fase final de construção e a inauguração está prevista para o início de 2019.

Phuoc Khanh bridge is a 4.7-kilometer cable-stayed bridge linking Ho Chi Minh City with Dong Nai. The bridge is part of the southern Vietnam’s longest highway, Ben Luc – Long Thanh Expressway, running through Long An province, Ho Chi Minh City and Dong Nai province.
When completed, the highway will connect the south-western region with the south-eastern region of the country, facilitating the transportation between the two parts of the country with improved traffic flow and larger lanes. The project aims to develop the socio-economic activities of this area.

Barras de pós-tensionamento Dextra para aplicações permanentes da ponte

For the construction of the Phuoc Khanh Bridge, Dextra is supplying its post-tensioning bar systems as permanent post-tensioning anchors.
Over 250 high performance fully-threaded post-tensioning bars and over 200 smooth bar systems were delivered to site. Also known as PT bars, they are specifically designed for post-tensioned applications. They can be corrosion-protected as is the case for the equipment supplied in the project. The corrosion protection is done in a controlled facility in Dextra’s factory, before being shipped to site.

Para saber mais sobre nossos produtos, conheça os produtos da Dextra soluções para pontes e viadutos.

The Tuen Mun–Chek Lap Kok Link (TM–CLKL) is a road project between the Northwest New Territories and Hong Kong – Zhuhai – Macao Bridge, the Airport and North Lantau.

The total length of the road is around 9 km, consisting of two elements which are the Northern Connection and the Southern Connection.
The Northern Connection will join Tuen Mun Area 40 to Hong Kong Port through an undersea tunnel, while the Southern Connection will link the Hong Kong Port and North Lantau Island on viaducts.

Dextra supplied 100,000 Bartec rebar couplers for the structure of diaphragm walls and tunnels.

Full-performance Bartec couplers are an optimal replacement for rebar overlapping, reducing both cost of material and rebar congestion at the lap zone.

Moreover, to avoid rebar congestion in the ventilation building structure, more than 50,000 Headed Bars were applied at the top of the columns. Headed Bars act as a substitute for hook and long development length with more simple and effective anchorage.

The Southern Connection was opened in October 2018. The project is expected to be fully commissioned by 2020.

Pumarejo Bridge is a 3,200m-long bridge including an 800m-long cable-stayed section and 1,300m of viaducts as well as access roads.

The new cable-stayed bridge is located over the Rio Magdalena river in Barranquilla and the Salamanca Island Road Park in Sitionuevo, Colombia.

It replaces the old Puente Pumarejo: with its two lanes, the old bridge was no longer doing justice to the increased traffic, and it quickly became an obstacle for shipping on the Rio Magdalena due to a clearance below of only 16 meters.

The new bridge comprises of 6 lanes of traffic (3 lanes each way), 2 side bike paths and a pedestrian path along its side.

Dextra provided rebar connection solutions that were designed to reinforce the concrete structures.

More than 120,000 Rolltec couplers were provided for pier and deck reinforcements.

In addition, over a thousand of Unitec bolted couplers were applied for the connection rebars without the need of threading.

Since its completion, it became the longest road bridge in the country and one of the largest in Latin America.

Source of images: https://www.khl.com/international-construction/colombias-longest-road-bridge/139582.article, https://commons.wikimedia.org/wiki/File:Puente_ pumarejo.jpg

Being the new fast-tracks linking the Center to the East of Thailand, the construction of Bang Pa-In – Nakhon Ratchasima Motorway is therefore considered one of the country’s major infrastructure projects.

The main purpose of this project is to stimulate the country’s economy. When completed, it will connect Thailand’s major urban centers within the Greater Mekong Sub-region.
The Intercity Motorway includes two sections: the six-lane 103-kilometer section from Bang Pa-In to Pak Chong, and the 93-kilometer four-lane from Pak Chong to Nakhon Ratchasima. Having been started in 2016, the project is planned to last until 2020.

The project’s required completion period of 4 years being challenging, the construction of the motorway has been divided into approximately 40 contracts to accelerate the project’s schedule.
To minimize potential impacts to local residents, a number of underpasses, overpasses and elevated structures (e.g. large viaducts) are provided throughout the Bang Pa-In – Nakhon Ratchasima Motorway.

Optimize the infrastructure project with Dextra’s rebar couplers

For the construction of the motorway’s elevated structure, the contractors of different packages opted for Dextra’s full performance Bartec rebar couplers to save time and money on the mechanical connection of the diameter 20mm to 32mm reinforcement bars.
Thanks to Bartec’s unique splicing system, all applications (Standard/ Position) can be fulfilled by one and only model of rebar coupler, reducing inventory management of the project to a minimum.
Further to this, Dextra’s Sonitec sonic tubes were also installed for cross-hole sonic logging tests in the foundations of the Bang Pa-In – Nakhon Ratchasima Intercity Motorway structures.

Dextra’s post-tensioning bars for the Motorway’s elevated structures

In addition to Dextra’s splicing and cross hole logging solutions, both smooth and fully-threaded Post-Tensioning bars were also used for both temporary (lifting and launching girder assembly) and permanent applications in segments. Approximately 28,000 sets of both PT bars have been delivered as per June 2018.
For more information about Dextra’s solutions in Thailand, please contact our Bangkok office.

The construction of Binh Khanh Bridge is a part of Vietnam’s Ben Luc – Long Thanh Expressway project, which will run through Ho Chi Minh City and southern Long An province and involves the construction of 58-kilometer long roads.
Being started in 2016 and scheduled to be in service within 2020, the main purpose of this project is to develop the country’s transport facilities for fast vehicles.
To ease the construction of this 58-km long expressway, the project owner Vietnam Expressway Corporation has divided the project into three phases: the western, the middle, and the eastern sections.

Smooth and Fully-threaded PT bars: post-tensioning solutions for bridges and viaducts

For the construction of the 3-kilometer long Binh Khanh Bridge, which is part of the middle section, Dextra has supplied smooth and fully-threaded post-tensioning bars have been delivered. These have been used in the main structure, the stay cable, as well as the bridge’s western and eastern approaches.

For more information about our solutions in Vietnam, please contact our Escritório em Banguecoque.

Thane-Kalwa Creek Bridge is a nearly 2.4-km long U-shaped road bridge over the Thane creek at Kalwa Naka, India, aiming to ease the traffic congestion between Thane and Navi Mumbai along with congestion in Kalwa and Thane city areas.

Dextra delivered more than 20 sets of Tension Rod system in various lengths (maximum length supplied is ~24m), size M108, grade 700, used as suspenders for basket handle bridge/steel arch bridge.

Tension Rods typically act as bracing or suspension elements and provide the benefits of high strength, length adjustability, ease of installation as well as the ability to be post-tensioned after installation. A wide range of sizes and accessories in various steel grades and in both carbon and stainless steel is available.

The bridge was originally scheduled to be opened in 2020, but the pandemic and the subsequent lockdowns significantly delayed the construction.