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 Nachspannung 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

Die Bach-Dang-Brücke ist das erste rein vietnamesisch entworfene und gebaute Mega-Infrastrukturprojekt im Norden Vietnams. Die Kosten für das Projekt werden auf 7,3 Billionen VND (ca. 312,2 Millionen USD) geschätzt. Die 5,4 Kilometer lange Brücke überspannt den historischen Fluss Bach Dang und ist Teil des Autobahnprojekts Hanoi – Quang Ninh. Es verfügt außerdem über vier Fahrspuren mit einer Breite von 28 Metern, die sorgfältig für Geschwindigkeiten von bis zu 100 km/h ausgelegt sind. Die Brücke und die Autobahnanbindung sollen dazu beitragen, die Entfernung von Hanoi und Quang Ninh von 175 km zu verkürzen. auf 125 km zu reduzieren und die Fahrzeit zwischen den beiden Orten zu halbieren.

Der Bau der ersten mehrfeldrigen Schrägseilbrücke in Vietnam

Die allererste in Vietnam hergestellte mehrfeldrige Schrägseilbrücke verfügt über drei H-Pylone, die die städtischen Gebiete Hanoi, Hai Phong und Quang Ninh repräsentieren. Diese Regionen sind nun durch die Brücke verbunden, um ihr Wirtschaftswachstum anzukurbeln. Der Fluss Bach Dang hat eine historische Bedeutung, da hier im Jahr 938 n. Chr. die Schlacht von Bach Dang stattfand, in der vietnamesische Rebellentruppen die kaiserliche Herrschaft Chinas über Vietnam besiegten und ihr ein Ende setzten. Die Bach-Dang-Brücke wird den strategischen Rand der nördlichen Region nur noch weiter stärken.

Dextra-Vorspannstäbe für den dauerhaften Einsatz der Brücke

Für den Bau der Bach-Dang-Brücke wurden Dextra-Vollgewindestäbe als dauerhafte Vorspannanker angebracht.
Für dieses Mega-Infrastrukturprojekt lieferte Dextra über 100 leistungsstarke Vorspannstangensysteme. Sie werden auch als PT-Stäbe bezeichnet und sind speziell für vorgespannte Anwendungen konzipiert. Sie können wie die im Projekt gelieferten Geräte korrosionsgeschützt sein. Der Korrosionsschutz wird in einer kontrollierten Anlage im Werk von Dextra durchgeführt, bevor er an den Standort geliefert wird.

Um mehr über unsere Produkte zu erfahren, entdecken Sie Dextra's Lösungen für Brücken und Viadukte.

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
Bartec 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

The Zuari bridge is a 640-meter long 8-lane cable-stayed bridge laying across the massive river Zuari in Goa. The project also includes 450-meter long elevated approaches with only 2 pillars, along with a 12-kilometer detour. The total value of the project is estimated at $227M.

This new bridge will solve the long commute problems across the two banks of the river. Additionally, with the wider span than the old one, this shall also take care of the growing vehicular traffic which its predecessor built some 30 years back.

With the new bridge, the Public Work Department (PWD) aims to improve road safety and ease traffic flow. Two towers and viewing galleries will also be added for tourism purposes. Being started in 2016, the project is planned to be finished in 2019.

Parallel-threaded rebar couplers for the bridge’s pile cages and pylons

For this massive project in Goa, Dextra has been supplying its popular parallel-threaded rebar splicing solutions Bartec for Fe 500 and Fe 600 Grade steel. More than 110K Bartec couplers are getting installed in Pile cages and Pile caps. This is one of the iconic bridge project, may be one of its kind, with Fe 600 grade steel to be a part of Pile caps and Fe 500 grade steel in piles up to 48 meter deep. Pylon is 103 meter in height and designed with Fe 600 grade steel as well.

Bartec is a full performance mechanical rebar couplers, with no reduction of cross-section area of the bar thanks to their parallel-threads. This characteristic makes the rebar connections a strong point of the structure, and can also simplify the project’s inventory: one type of coupler for both standard and position applications.

The bar-end preparation is also supported by 3 high-productivity machines which prepare each bar in sequence: cutting, cold forging and threading.

Dextra post-tensioning bars for precast elements and segment castings

In addition to Bartec couplers, for the bridge’s precast segments, the contractors also opted for Dextra post-tensioning bar systems. PT bars helps the project’s stakeholders carry out the erection of precast segments and the casting of the segments in time, and in a quality controlled manner.

More than 500 sets of pt bars were delivered to the project as of November 2018. Dextra has made supplies to Dilip Buildcon for Yard applications and Launching.

Also, for phase III of the project, Dextra has made supplies to NRS for PT bars and accessories.

Das indonesische Ministerium für öffentliche Arbeiten (MoPW) hat den Bau eines neuen Doppelbrückenprojekts zur Überquerung des Mahakam-Flusses in Samarinda in der Provinz Ost-Kalimantan in Auftrag gegeben. Das Mahakam IV-Projekt umfasst zwei separate Brücken: Die 1.388 m lange Schrägseilbrücke hat eine Spannweite von 220 m, eine Breite von 17 m und eine vertikale Durchfahrtshöhe von 22 m, während die 740 m lange Hauptbrücke eine Breite von 14 m und eine vertikale Durchfahrtshöhe von 25 m hat.

Dextra war bereits in der Anfangsphase des Projekts involviert und stellte BIM-Tools zur Verfügung, um das Zugtragsystem in den gesamten Tragwerksentwurf zu integrieren.

Am Ende des Prozesses wurden mehr als 60 Zugstäbe aus Kohlenstoffstahl unterschiedlicher Länge auf die Baustelle geliefert. Die Gabeln und Spannschlösser des Systems ermöglichen eine Längenanpassung an die Anforderungen vor Ort.

Das Zugstabsystem von Dextra ermöglicht eine optimale Aufnahme der Zuglasten der Struktur. Um allen technischen und ästhetischen Anforderungen eines Projekts gerecht zu werden, stehen verschiedene Festigkeitsklassen und Oberflächenveredelungen zur Verfügung.

Das Projekt wurde 2019 fertiggestellt und für den Verkehr freigegeben.

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.