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

バクダン橋は、ベトナム北部に位置する初の全ベトナム人が設計・建設した巨大インフラプロジェクトです。このプロジェクトの費用は 7 兆 3,000 億 VND (約 3 億 1,220 万米ドル) と推定されています。この橋は全長 5.4 キロメートルで、歴史あるバクダン川に架かっており、ハノイ - クアンニン高速道路プロジェクトの一部です。また、幅 28 メートルの 4 車線があり、時速 100 km までの速度で走行できるよう細心の注意を払って設計されています。この橋と高速道路の接続は、ハノイとクアンニン間の距離を 175 km から短縮することを目的としています。距離は 125 km に短縮され、2 つの地域間の移動時間が半分に短縮されます。

ベトナム初の多径間斜張橋の建設

ベトナム初の多径間斜張橋は、ハノイ、ハイフォン、クアンニンの都市部を表す 3 つの H パイロンを備えています。これらの地域は現在、経済成長を促進するために橋で結ばれています。バクダン川は、西暦 938 年にベトナム反乱軍が敗北し、中国帝国のベトナム支配に終止符を打ったバクダンの戦いの場所であるため、歴史的に重要な意味を持っています。バクダン橋は、北部地域の戦略的優位性をさらに強化するだけです。

橋の恒久的な用途向けの Dextra ポストテンションバー

バクダン橋の建設では、デクストラの全ねじバーが恒久的なポストテンションアンカーとして橋に適用されました。
この巨大インフラプロジェクトのために、Dextra は 100 を超える高性能ポストテンション バー システムを供給しました。 PT バーとも呼ばれるこれらは、ポストテンション用途向けに特別に設計されています。プロジェクトで供給される機器の場合と同様に、腐食から保護することができます。腐食保護は、現場に出荷される前に、Dextra の工場内の管理された施設で行われます。

当社の製品についてさらに詳しく知りたい場合は、Dextra のサイトをご覧ください。 橋と高架橋のソリューション.

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.

北ルソン高速道路プロジェクト (NLEx) は、フィリピンの首都マニラの北で行われている、一部高架化された大規模な道路プロジェクトです。このプロジェクトの目的は、ルソン島に強固な南北道路接続を提供することです。プロジェクトの総延長は80kmを超える。

このプロジェクトでは、Dextra が請負業者 Leighton Philippines を人気のあるプロジェクトでサポートしました。
バーテック ソリューション、東南アジアで一般的な鉄筋接合方法。

Bartec は、請負業者に鉄筋を接続する信頼性の高い方法を提供するため、アジアで非常に人気があります。 Bartec 鉄筋準備の独自の手順は、バーエンドの切断/拡大から始まり、ねじ切り前に鉄筋を均一にすることができるため、異なるロットの鉄筋間でも均一であり、時間の経過とともに信頼性が高くなります。

2015 年から 2017 年にかけて、オルス ルソン高速道路プロジェクトの高架部分、橋塔の上部で鉄筋カプラーが使用されました。カプラーにより、パイロンと最終的に道路を支えるプレキャスト梁の頭部との間の接続が可能になりました。

この用途だけでも、直径 D28 および D36 の 78,000 以上の鉄筋カプラーが使用されました。 Bartec がサポートする直径の範囲は、Dextra シリーズの中で最も幅広いものの 1 つです。詳細については、ダウンロード セクションで入手可能な技術データシートを参照してください。

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 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.

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.