Categoría: Noticias

Postensado Bar systems are highly customizable and versatile solutions allowing for multiple applications in bridge/viaduct construction.

Dextra has recently supplied customized PT bar systems for the reinforcement of precast girder segments used on the Bang Pa In – Saraburi – Nakhon Ratchasima highway in the North-East of Bangkok.

El Sistemas de barras postensadas, made of hot rolled deformed high-tensile bars (FT bars) Ø36mm, allow for the vertical reinforcement of the precast segments, with up to 14 sets per girder element.

Each bar will be jacked and put under the required tension from the top of each element while on the ground. After that the girder is lifted and installed in its final position.

Permanent corrosion protection will be achieved by filling a galvanized duct around the bar with grout.

More about Fully Threaded Bar Systems

The tower, whose construction started end of 2014, is expected to reach the height of 461 meters, a new height record in Vietnam. Landmark 81 will the 11th tallest tower building in the world.
For this project, Dextra is supplying its renowned bartec solution to contractor Coteccons. bartec rebar coupler solution has been approved by ARUP, owner’s representative consultant, and MACE International, structural consultant.

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Dextra recently released an update of all its rebar coupler tools to upgrade to latest version of Tekla.

New Tekla version now allows clear visualization of threaded bar ends, allowing to see the extended threads for first phase rebar for example.

Tekla attributes are available to download from Dextra website.

Download Tekla attributes

Management and employees from all offices of Dextra Group in Thailand attended an official ceremony, Dextra being host of Funeral prayers to “His Majesty The King Bhumibol Adulyadej, King Rama IX’s Royal remain” (who had passed away on the 13th October 2016), at “The Dusit Maha Prasart Throne Hall”, on Thursday the 25th of May 2017 at 17:00 hrs.

This official ceremony was presided by Mr. Jean-Marie Pithon, Group Chairman and CEO, Mr. Frederic Pagniez, Managing Director of Dextra Industry & Transport and Mr. Jean-Jacques Braun, Technical Director of Fabricación Dextra, accompanied by a delegation of 47 employees from Dextra affiliates in Thailand.

The mourning ceremonies in Bangkok will continue to allow the people of Thailand to pay their respects to His Majesty The Late King at the Royal Palace, until the national cremation takes place on Thursday, the 26th October 2017. This day was proclaimed national holiday in Thailand.

El nuevo Puente Champlain es un puente de 3 km de longitud que cruza el río San Lorenzo en la entrada sureste de Montreal, en la provincia de Quebec (Canadá).

The Champlain Bridge is one of the busiest bridges in Canada and plays an important economical role for its city as it is part of the main itinerary to the United States, accessible 60-km South.

For this project, Dextra is supplying its Empalme mecánico de barras de refuerzo Rolltec system, in both Carbon Steel and Stainless Steel versions. Rolltec is a certified system by the Department of Transportation of the State of Quebec.

Read more on full project page

This year again, Dextra lined up 2 teams of 12 runners at Peak24 race in Hong Kong! The teams were featuring a mix of Dextra Guangzhou and Dextra Hong Kong staff, pushing together their limits for the good cause and in an incredible atmosphere!

Peak 24 Race is a charity race aiming to raise awareness about slavery and human trafficking problem in the world, and especially in Asia. Funds raised by Peak24 will be donated to the 24 Hour Race, a Hong Kong-founded & international youth charity which inspires students in five countries to join the movement to eradicate modern slavery. The profits raised from us will directly benefit the expansion of the 24 Hour Race movement.

In the United Arab Emirates, Dextra recently delivered a new Oil and Gas project. Dextra tension rods have been used for the support of structure supporting very large liquid gas tanks.

For this application, Dextra engineered, manufactured and delivered bar assemblies based on Carbon Steel bars Gr.355 of diameter Ø120mm. Each barra de tensión system is composed of two segments spliced at the lower half of the assembly. The system is mounted onto gusset plates thanks to their fork ends, which can be connected to the structure in just a few minutes by simply sliding in a pin in the middle of the fork.

For length adjustment and tightening, turnbuckes, positionned at the lower half of each tendon, are simply rotated to bring bar segments closer to each other and tension the overall system.

El Metro de Riad es un enorme proyecto de sistema de transporte urbano que se está construyendo en Riad, Arabia Saudita. El proyecto contará con 85 estaciones, construidas a lo largo de 6 líneas de transporte, para una longitud ferroviaria total de 176 kilómetros. Se espera que el sistema atienda al menos a 1 millón de pasajeros diariamente en su inauguración en 2018.

For this large infrastructure project, Dextra Middle East has been involved on various stations and packages.

Trabajos de excavación

Before proceeding with general construction works, during early excavation phase, it is required to anchor retaining walls back into the stable ground in order to prevent any wall displacement. This will allow to keep excavating in a safe environment.

For that purpose, Dextra supplied steel ground anchors installed through retaining wall. Each system is based on a high-tensile fully threaded bar, coming with nut and plate, and grouted to provide bonding with the soil.

Conexiones de balsa y verticales

Acopladores de barras de refuerzo Bartec were supplied for the works in the stations. Couplers were used for slabs, column and wall connections. A typicall application on this project is to cast rebar couplers in the concrete with reinforcement, and then proceed with second phase bar connection at a later stage.

Unitec bolted couplers can have also been use on various parts of the project. Typically Unitec is used when overlap is planned but lapping length appear to be too short to perform a safe splice. In that case Unitec provides a convenient and full performance connection.

Dextra supplied contractor Italian-Thai with Barras de tensión to support the roof structure of the expansion of BITEC, a leading exhibition and convention center in central Bangkok. Installation has successfully be completed in 2016!

In total, Dextra delivered 298 assemblies in various diameters, each composed of multiple bars connected with couplers and turnbuckles and anchored to the structure with fork ends, with total assembly lengths in several cases exceeding 50 meters long (average 33 meters).

Para estructuras tan grandes, Barras de tensión offer a number of advantages compared to other “tensioning” solutions: lower elongation under loads, lower post tensioning forces required, better resistance to corrosion, reduced long terms relaxation and reduced maintenance and surveillance costs.