The Cross Tay Link Road project in Perth and Kinross, Scotland, is set to transform transportation in the area. One of the notable features of this road construction endeavor is the inclusion of a three-span bridge over the magnificent River Tay, the longest river in Scotland. This project aims to enhance connectivity and improve travel efficiency for residents and visitors alike.

To ensure the structural integrity of the bridge’s foundation piles, Dextra provided a quantity of 1,920 tubes, amounting to 11,136 linear meters of Sonitec ST50. This specialized product is designed for pile integrity testing using the Crosshole Sonic Logging (CSL) method. It facilitates the evaluation of the quality and reliability of the foundation piles, ensuring the bridge’s long-term stability and safety.

The Tan Vu – Lach Huyen Bridge is a 5.4-km long bridge located East of Hai Phong, in the North of Vietnam. The brige is connecting the Hai Han district (East of Hai Phong), to the new port of Lach Huyen, located on the island district of Cat Hai. This will also allow the port of Lach Huyen to be directly connected to the Hai Phong/Hanoi highway, drastically reducing the transit time to Vietnam’s capital city.

The bridge project is part of a broader infrastucture plan: the Tan Vu – Lach Huyen highway infrastructure project, which aims to develop Hai Phon as a main transportation hub in the North of Vietnam.

For this bridge project, Dextra supplied two types of Post Tensioning systems:

• For the permanent reinforcement of precast girder segments, Dextra supplied PT smooth bar systems with threaded ends in sizes M39 and M49, grade 835/1030 and 930/1080. Dextra bar systems are used for the vertical post-tensioning of concrete segments.
• For the lifting and temporary fixing of the precast girders segments during the construction phase, Dextra supplied its Fully threaded bar systems in diameters 32 and 36, grade 1080/1230.

For all temporary applications such as lifting and fixing operations, Fully threaded PT bar systems are a convenient and economical solution as they bars can easily be cut, adjusted and re-used several times. Thanks to their continuous thread, the bars can be spliced at any points by the use of couplers or turnbuckles, which are also available from Dextra.

For more information and engineering support regarding Post Tensioning Systems in Vietnam, please contact contact our office in Bangkok.

The replacement of the Smith River Bridge at the South Fork Road, Crescent City (also named George Tryon Bridge) is a local infrastructure project initiated by the Federal Highway Administration (FHWA) and handed over contractor Flatiron West, Inc. The aim of the project is to replace an existing steel bridge, built in 1948.

For this project, Dextra supplied its Bartec rebar coupler solution. Bartec allows a convenient connection of rebars on large diameters from #4 to #18 (Imperial rebar sizes) and were used in columns and beams of the new replacement bridge. Bartec takes advantage of extended threads on rebars to splice them without the need of rotating any bar and without any extra further component: only a standard rebar coupler is required.

Additionally, Bartec Headed Bars were also supplied, replacing hook bars in congested reinforcement areas.

Bartec is a prequalified and authorized solution by CALTRANS (California Transportation Department) and has previously been tested and approved by the California Department of Transportation.

For more information about Dextra solutions available in the United States, please contact our North America office

The Bach Dang Bridge is the first all-Vietnamese designed and constructed mega infrastructural project located in northern Vietnam. The project is estimated to cost 7.3 trillion VND (approximately 312.2 million USD). The bridge 5.4-kilometer bridge spans over the historic Bach Dang River and is part of the Hanoi – Quang Ninh highway project. It also features 4 lanes of 28 meters wide, meticulously designed for speeds of up to 100km/hour traffic. The bridge and highway connection are intended to help shorten the distance from Hanoi and Quang Ninh from 175 km. to 125 km., as well as to cut travel times between the two localities in half.

The construction of the first multi-span cable-stayed bridge in Vietnam

The very first made-in-Vietnam multi-span cabled-stayed bridge features 3 H-pylons, representing Hanoi, Hai Phong, and Quang Ninh urban areas. These regions are now connected by the bridge to boost their economic growth. Bach Dang River has a historical significance as it is the site of the Battle of Bach Dang in 938CE, where rebel Vietnamese forces defeated and put an end to the Chinese imperial domination of Vietnam. Bach dang Bridge will only enhance further the strategic edge of the northern region.

Dextra post-tensioning bars for permanent applications of the bridge

For the construction of the Bach Dang Bridge, Dextra fully-threaded bars were applied to it as permanent post-tensioning anchors.
For this mega infrastructural project, Dextra supplied over 100 high performance post-tensioning bar systems. 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.

To learn more about our products, discover Dextra’s solutions for bridges and viaducts.

The Kanchpur, Meghna, and Gumti 2nd Bridges Construction and Existing Bridges Rehabilitation Project (KMG project) includes the construction of three new bridges on National Highway No. 1 (NH-1) across the Kanchpur, Meghna, and Gumti rivers, as well as the rehabilitation and renovation of existing bridges.

The new bridges have four lanes and are built beside older bridges with approach roads.

The objective of the project is to improve traffic conditions and transportation efficiency on the National Highway No.1 between Dhaka and Chittagong, contributing to Bangladesh’s long-term economic growth.

Dextra supplied thousands of Unitec couplers, ranging from diameter 12mm to 28mm to connect top slabs and piers.

Unitec is a bolted splicing system designed for the connection of two rebars which haven’t been previously prepared (no thread). It can be assembled on site with standard impact/pneumatic wrench.

The North Luzon Expressway project (NLEx) is a large road project, partly elevated, taking place North of Manila, the capital of the Philippines. The objective of the project is to provide a robust North-South road link on the Luzon Island. The total length of the project exceeds 80km.

For this project, Dextra supported contractor Leighton Philippinese with its popular
Бартек solution, popular rebar splicing method in South East Asia.

Bartec is very popular in Asia as it offers contractors a reliable way of connecting rebar. The unique sequence of the Bartec rebar preparation, which starts by cutting/enlarging the bar end, allow to uniformize the rebar before threading, making it reliable over time, evene between different lots of bars.

Between 2015 and 2017, Rebar couplers were used on the elevated segment of the orth Luzon Expressway project project, at the top of the bridge pylons. Couplers allowed the connection between the pylons and the head of the precast beams, which will ultimately support the road.

For this application alone, more than 78,000 rebar couplers were used, in diameters D28 & D36. Bartec range of diameters supported is one of the widest among the Dextra range, for more information, please refer to our Technical Datasheet available in the Download Section.

Bezons Viaduct is part of the extension to the suburban train line E (Eole) of the Regional Express Network, an hybrid transit system in Paris, France, serving the capital and its suburbs.

The viaduct connects the train line E to the existing network with a 96m-long bowstring-arch bridge that allows the lines to pass over the existing railway line on ground.

A proper concrete tensioning system was required to ensure the stability of the 2,000 tons structure: Dextra and its Tension Rods stepped in for that purpose.

The key success factor of this project, both in terms of design and customer care, was the strong collaboration between Dextra and its local partner Freyssinet.

Photo credit: https://www.lemoniteur.fr/article/bezons-le-bow-string-du-saut-de-mouton-d-eole-est-en-place.2044730#! ©CHRISTOPHE RECOURA/FOORESO

Мост Зуари — это 8-полосный вантовый мост длиной 640 метров, проложенный через массивную реку Зуари в Гоа. Проект также включает в себя надземные подходы длиной 450 метров всего с двумя опорами и 12-километровый объезд. Общая стоимость проекта оценивается в $227M.

Этот новый мост решит проблемы длительных поездок на работу через два берега реки. Кроме того, благодаря более широкому пролету, чем у старого, он также должен позаботиться о растущем автомобильном движении, которое его предшественник построил около 30 лет назад.

С помощью нового моста Департамент общественных работ (PWD) стремится повысить безопасность дорожного движения и облегчить транспортный поток. В туристических целях также будут добавлены две башни и смотровые галереи. Проект стартовал в 2016 году, завершить его планируется в 2019 году.

Арматурные муфты с параллельной резьбой для свайных каркасов и пилонов моста

Для этого масштабного проекта в Гоа Dextra предоставила свою популярную решения для соединения арматуры с параллельной резьбой Bartec для стали марок Fe 500 и Fe 600. Более 110 тысяч соединителей Bartec устанавливаются в свайных клетках и наголовниках свай. Это один из знаковых проектов мостов, возможно, единственный в своем роде: сталь марки Fe 600 будет использоваться в качестве наголовников свай, а сталь марки Fe 500 — в сваях глубиной до 48 метров. Пилон имеет высоту 103 метра и также изготовлен из стали марки Fe 600.

Bartec — это полнофункциональные механические соединители арматурных стержней, которые не уменьшают площадь поперечного сечения стержня благодаря параллельной резьбе. Эта характеристика делает соединения арматуры сильной стороной конструкции, а также может упростить инвентаризацию проекта: один тип муфты как для стандартных, так и для позиционных применений.

Подготовку концов прутка также осуществляют 3 высокопроизводительных станка, которые последовательно подготавливают каждый пруток: резку, холодную ковку и нарезание резьбы.

Стержни пост-напряжения Dextra для сборных железобетонных элементов и сегментных отливок

В дополнение к муфтам Bartec для сборных сегментов моста подрядчики также выбрали системы пост-натяжения Dextra. PT-стержни помогают участникам проекта своевременно и с контролем качества выполнять монтаж сборных железобетонных элементов и их отливку.

По состоянию на ноябрь 2018 года для проекта было поставлено более 500 комплектов PT-стержней. Dextra осуществила поставки для Dilip Buildcon для применения на верфи и запуска в эксплуатацию.

Кроме того, на этапе III проекта Dextra осуществила поставку NRS стержней PT и аксессуаров.

Министерство общественных работ Индонезии (MoPW) заказало строительство нового проекта двойных мостов, пересекающих реку Махакам в Самаринде, в провинции Восточный Калимантан. Проект Махакам IV включает в себя два отдельных моста: вантовый мост длиной 1388 м имеет длину пролета 220 м, ширину 17 м и вертикальный просвет 22 м, а главный мост длиной 740 м имеет ширину 14 м и вертикальный просвет 25 м.

Dextra уже участвовала в реализации проекта на ранних стадиях, предоставляя инструменты BIM для интеграции системы поддержки натяжения в общий структурный проект.

По окончании процесса на строительную площадку было доставлено более 60 тяг из углеродистой стали различной длины. Вилы и талрепы системы позволяют регулировать длину в соответствии с требованиями площадки.

Система натяжных стержней Dextra позволяет оптимально поглощать растягивающие нагрузки конструкции. Доступен ряд различных классов прочности и отделки поверхности, отвечающих всем техническим и эстетическим требованиям проекта.

Проект завершен и открыт для движения в 2019 году.

The National Highway 44 (NH 44) is the longest highway of India, spanning 3,745km from Srinagar to Kanyakumari.

As time moved forward, the cities close to the highway expanded at such a pace that the neighborhoods adjoining the highway mushroomed to very significant numbers.

As a result, the pedestrians and light vehicles along the two sides of the road often affect the flow and speed of long route heavy vehicles. It also poses a big risk for those local lighter vehicles and pedestrians.

To solve this problem, the Highway Authority of India proposed the road widening to be coupled with flyovers over the stretch wherein the highway is running through densely populated towns.

The 34-km long elevated stretch of highway in Nagpur-Hyderabad area is being constructed to improve the road network between Nagpur and the capital city of Hyderabad.

The authorities selected a segmental construction technology for the elevated bridges, and each heavy segment was casted in the quality-controlled environment of precast yards.

Considering the substantial size of these precast segments, it has been necessary to source easy-to-use lifting material, capable of sustaining high loads.

Dextra hot rolled fully threaded bars were the best fit to those requirements.

More than 100 sets of fully threaded (FT) post tensioning bars for lifting and launching of precast segments with launching girder have been supplied for this project, along with accessories such as end nuts and couplers.

Dextra FT Bar systems are frequently used for temporary applications such as heavy lifting and stitching of precast elements and anchoring of steel frame supports.

In the case of permanent applications, the FT Bars can be used for the connection of girders and piers in segmental bridge construction.