Río Subterráneo a Lomas tunnel is a 13.5-kilometer-long tunnel in Buenos Aires, Argentina, which will transport drinking water from the newly expanded General Belgrano Water Treatment Plant in Bernal’s Quilmes area to the city of Lomas de Zamora.

Being the main element of the Agua Sur system, a water supply project in Argentina, the tunnel is the country’s largest water infrastructure project in the last 40 years. This new system will provide 2.5 million inhabitants in the Buenos Aires metropolitan area’s southern region access to freshwater.

For this significant project, Dextra supplied soft eyes reinforced with GFRP (Glass Fiber Reinforced Polymer) bars to facilitate the penetration of Tunnel Boring Machines (TBM) through a reinforcement cage.

The project required two boring machines to be launched and received from shafts. The tunnel was excavated at an average depth of 25 meters, starting with a curve with a radius of about 400 meters, and moving along a largely straight alignment, with a maximum slope of +/- 2 percent.

The first launch shaft is composed by 4 circular sectors that interconnected with each other in the bottom area. The total length of the shaft is around 45 meters long, 12 meters wide, and 25 meters high.

The whole project is anticipated to take approximately 10 years to complete.

The Dubai Metro is a urban transit rail system operating in Dubai, United Arab Emirates. Two lines are currently operational, the Red Line and Green Line. Additional lines are also planned for coming years.

For the construction of the Red Line, Dextra has been involved between 2005 and 2010 together with the contractors making J T Metro (Obayashi Corporation – Kajima – YapiMerkezi) for the supply of numerous Dextra solutions for various packages and stations.

For the station construction, especially for the foundation works (piles and perimeter d-walls), Dextra supplied its Bartec rebar splicing solutions. Rebar couplers were used for vertical connections in piles D-Walls, columns and piers. Rebar couplers were also used for reconnecting slabs onto the D-Walls. A total of 800,000 Bartec rebar couplers have been supplied for this project, supported by several Bartec equipment sets maintained by local Dextra Aftersales team.

For minor repair applications, ReparaciónGrip couplers were also supplied to splice rebar which had not be prepared with a thread and which had unsufficient produding length to be spliced.

For foundation works as well. Dextra supplied more than 60km of Tubos sónicos Sonitec, used the CSL integrity testing of piles and walls. Sonitec can be easily assembled at site thanks to their push-fit mouth system, boosting teams productivity and avoiding the tedious task of welding tubes together.

Finally, to accelerate tunneling breakthrough phases and minimize TBMs (tunnel boring machines) time when exiting/entering shafts and stations, Dextra engineered the design of GFRP Soft Eyes and supplied more than 400 km of composite rebar for numerous station packages.

Coimbra B-Portagem Mondego Metro project is part of the mass transit public transport system of Coimbra, Portugal. Dextra has played a significant role by providing Sonitec tubes for pile testing.

Dextra has supplied Sonitec tubes for testing a total of 67 piles ranging from 12 to 19 meters in depth. The tubes have been instrumental in conducting these tests with the Cross-Hole Sonic Logging (CSL) methodology.

The innovative push-fit connection system of Sonitec has greatly reduced labor time during installation. Thanks to this user-friendly system, the contractor has experienced smoother and more efficient pile testing processes. By eliminating the need for additional labor-intensive procedures, the contractor has saved valuable time and resources. It also ensures a secure and reliable connection between piles.

London Crossrail (que recibió el nombre de Línea Elizabeth en 2016) es el proyecto de ingeniería más grande de Europa. Es una parte importante del programa de inversión de Transport for London y la mayor incorporación al sistema de transporte en 50 años.

El proyecto consiste en un enlace ferroviario de este a oeste de 118 kilómetros que atravesará el Gran Londres y que irá desde Reading y Heathrow en el oeste hasta Shenfield y Abbey Wood en el este.

Desde 2009, Dextra ha entregado más de 600.000 conexiones Griptec en más de 20 paquetes que incluyen estaciones como:

• Calle Liverpool
• Paddington
• Calle Bond
• Canary Wharf
• Portal del roble real
• Carril del molino de pudín

Los acopladores Griptec se han utilizado en D-Wall (uniones verticales y horizontales), columnas y pilotes (uniones verticales).

Se espera que los segmentos de Crossrail comiencen a operar progresivamente, y su finalización total está prevista para diciembre de 2019.

The Rio de Janeiro Line 4 is a subway line. It is part elevated and part underground (2 segments). The line has been planned to open for the 2016 Rio de Janeiro Summer Olympics.

Dextra has been involved since between 2013 and 2015 in the design, engineering and supply of four large FRP Soft Eyes for the station entry/exit points. Those Soft-Eyes were the first ever delivered in the South American continent.

Antes de la construcción de D-Wall, Dextra diseña el diseño de la jaula de FRP teniendo en cuenta el tamaño de la tuneladora, el margen de error, las fuerzas del suelo y más parámetros de diseño.

Thanks to the properties of FRP material, Tunnel Boring Machines cut through the D-Wall in a minimum time, saving time on schedule and ensuring the perfect condition of the TBM’s head. The time factor is especially important in humid environments such as Rio to limit the water entry into the station excavations.

On this project, Dextra also supplied Rolltec Rebar Couplers, used as vertical connections in the station diaphragm walls as vertical connectors to reconnect cages.

Couplers were also used horizontally to provide a reconnection point for slabs (at station level and at the surface) in the D-Walls.