Grupo Dextra | Conexiones confiables

Túnel de la puerta oeste

Túnel de la puerta oeste

El Proyecto del Túnel West Gate ofrecerá una alternativa vital al Puente West Gate, proporcionando un segundo cruce de río muy necesario, viajes más rápidos y seguros, y retirará miles de camiones de las calles residenciales.

El proyecto unirá la autopista West Gate en Yarraville con el puerto de Melbourne y CityLink en Docklands a través de túneles gemelos debajo de Yarraville y una carretera elevada Footscray.

El camino elevado incluye 300 pilotes de altura variable. Los pilotes han sido prefabricados en múltiples segmentos, cerca del sitio. Las barras verticales de postensado ensamblan todas las dovelas de cada pilote.

Este método de construcción de pilotes es cada vez más común pero requiere una preparación impecable, tanto en términos de enunciado del método como de definición de productos. Cada detalle es fundamental para el éxito de la instalación.

Dextra suministró a Freyssinet más de 1.000 toneladas de sistemas Freyssibar+, calidad 930/1080 MPa, con diámetros nominales de 72 mm y 55 mm, y 7.500 anclajes para aplicación vertical permanente.

Gracias a una estrecha colaboración entre DEXTRA, el back-office de Freyssinet (Departamento Técnico y empresa de productos Freyssinet) y el personal de obra (Freyssinet Major Project y Freyssinet Australia), el sistema de postensado se ha adaptado perfectamente a las necesidades del proyecto.

Los diámetros de las barras, la calidad del acero y el diseño de los anclajes han sido validados mediante pruebas de calificación según Normas Australianas, demostrando el desempeño del sistema.

Este sistema de barras se puede utilizar para postensado, anclajes al terreno pretensado y cualquier aplicación que implique tirantes temporales o permanentes, elevación, suspensión, empalmes pretensados, etc.

La construcción del importante proyecto comenzó en enero de 2018.

Enlace de Doha (Calzada de Jaber)

Enlace de Doha (Calzada de Jaber)

 
Doha Link is a marine bridge project currently being built west of Kuwait City. It will ultimately be connected to the Main Causeway Across Kuwait Bay, another sea link project north of Kuwait City, which will make the Jaber Causeway sea link, one of the largest civil engineering projects ever built in the Middle East. The Doha Link stretches west of Kuwait City. It will ultimately solve traffic congestion and offer a direct itinerary thanks to a 7.7 km bridge structure built on shallow waters across the Kuwait Bay.  

Rebar Solución de empalme

Dextra ha participado en la etapa inicial del proyecto de construcción para proporcionar una solución técnica para el empalme de las jaulas de barras de refuerzo de gran tamaño que forman los pilotes de cimentación en tierra y mar. Rolltec® couplers for large diameter rebar (32, 36, and 40mm) were used for the connection of cages and piers. Two grades of rebar are used across the project: ASTM Grade 60 and Grade 80. Rolltec is compatible by design with the higher ASTM Grade 80; the same couplers may be used on all applications, simplifying stock keeping. In addition, smaller diameter couplers for rebar 12mm and 16mm were used for the superstructure and the footing of light poles. One of the main advantages of Rolltec for remote projects is its very light machine setup. Rolltec is supported by a single one-man machine, offering a high level of productivity. Because the equipment is relatively small and the rebar preparation efforts were taking place simultaneously on both sides of the sea link construction, Dextra dispatched up to 4 machines on each side of the project to support the Pilote efforts.  

Solución de tubo Sonitec

With large piles of 2.5m diameter and 60m depth on average, it was compulsory for GS E&C to conduct sonic logging tests to examine the integrity of concrete piles, requiring the installation of 8 tubes in each cage. To achieve very long tube length and optimize cage preparation output, Dextra Sonitec was the preferred choice of the contractor. Thanks to its lightweight and unique Push-Fit® connection feature. Sonitec provides enough flexibility during the cage construction, lifting, and assembly of the cage and removes the need for additional time-consuming welding operations.

Calzada que cruza la bahía de Kuwait

Calzada que cruza la bahía de Kuwait (Calzada de Jaber)

 

The Main Causeway across the Kuwait Bay is a 36-km-long project currently being built north of Kuwait City. It will ultimately be connected to Doha Link, another sea link project west of Kuwait City, which will connect the Jaber Causeway sea link, one of the largest civil engineering projects ever built in the Middle East.

The main causeway across Kuwait Bay stretches north of Kuwait City. It is expected that the link will greatly contribute to the development of the northern part of Kuwait. To achieve that, the Causeway will literally cut across Kuwait Bay with a 27-km sea link.

Pilones y vigas de puentes

For the visible part of the sea link, Dextra worked with contractor Hyundai to offer high-tensile post-tensioning bar solutions.

dextra Barra PT lisa A lo largo de todo el enlace marítimo se utilizaron vigas prefabricadas de calidad 835/1050.

For part of the sea link, which is topped by a metallic cable-stayed structure. Higher performance bars in Grade 1050/1200 were used to offer a vertical anchoring point between the pylon and the reinforcement of the pile. PT Bars were delivered with a full corrosion protection accessory set by Dextra so that the bars will resist the marine conditions.

Tubos de registro sónico Crosshole

For the concrete integrity testing of the onshore and offshore foundation piles, Dextra supplied around 400,000 linear meters of Sonitec tubes, which are easy to set up and reconnect without the need for welding, which significantly increases the productivity of the pile assemblies.

Una vez instalados, los tubos quedan firmemente en su lugar, soportando sin problemas el levantamiento y manipulación de la jaula.