Le métro d'Hô Chi Minh-Ville est le premier système de transport rapide du Vietnam, desservant la capitale commerciale et financière du pays.

Le métro comptera huit lignes. Les première, deuxième et cinquième lignes sont en phase de mise en œuvre, tandis que les lignes restantes sont en phase de planification des investissements.

La ligne 1 du projet mesure 19,7 kilomètres de long, avec un segment souterrain de 2,5 kilomètres et une section surélevée de 17,2 kilomètres. La ligne 1 reliera le marché Ben Thanh dans la zone centrale au parc d'attractions Suoi Tien dans le district 9. Il y a trois stations de métro dans toute la section souterraine. La ligne 1 comprend également une traversée de la rivière Saigon.

Le lot 1b de la ligne 1 comprend la construction de la section souterraine allant de la station Opera House à la station Ba Son, comprenant deux stations souterraines et un tunnel de métro de 1 315 mètres.

Shimizu-Maeda Joint Operation a sélectionné les solutions de renforcement du béton de Dextra pour minimiser la congestion de l'acier dans les zones fortement renforcées. 230 000 barres à tête ont été livrées et installées pour le renforcement des maillons de cisaillement.

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, RéparationGrip 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 Tubes soniques 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 (appelée Elizabeth Line en 2016) est le plus grand projet d'ingénierie en Europe. Il s'agit d'une partie importante du programme d'investissement de Transport for London et du plus grand ajout au système de transport depuis 50 ans.

Le projet consiste en une liaison ferroviaire est-ouest de 118 km à travers le Grand Londres, qui s'étendra de Reading et Heathrow à l'ouest jusqu'à Shenfield et Abbey Wood à l'est.

Depuis 2009, Dextra a livré plus de 600 000 connexions Griptec sur plus de 20 forfaits comprenant des stations telles que :

• Rue de Liverpool
• Paddington
• Rue des obligations
• Quai Canary
• Portail Royal Oak
• Ruelle du moulin à pudding

Les coupleurs Griptec ont été utilisés sur les murs en D (connexions verticales et horizontales), les colonnes et les pieux (connexions verticales).

Les segments de Crossrail devraient commencer à fonctionner progressivement, l'achèvement complet étant prévu pour décembre 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.

Avant la construction du mur en D, Dextra conçoit la conception de la cage FRP en tenant compte de la taille du tunnelier, de la marge d'erreur, des forces du sol et d'autres paramètres de conception.

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.

Nagpur, the second capital of Maharashtra and one of the fastest developing city in India is witnessing major growth in terms of Infrastructure. The development encompasses primarily the connectivity, of which Metro rail becomes a major part.

Incepted in 2016, the metro project is being a subject of acclaimed discussion for its speed of execution and the quality of construction.

Within the city boundaries, it requires the highest standards of safety considerations including the seismic analysis of structure in service life.

Project Requirement

The fast track project has typical structure for its Line 1 alignment, where the viaducts are supporting 2 levels of pathways, lower one for NH-7 and upper one for the metro rail. As the impact loading is a big concern due to train movement.
Being the stretch of always busy traffic, a solution was required which does not have to revise the existing design. Plus a major concern was the impact on speed of the otherwise fast moving project. The issue was concerning to all the stakeholders especially the GC for the project, who were looking to maintain the agility as well as find a sustainable solution.

Solution

Dextra Introduced Shear Key Bars for the priority section allowing the structure to neutralize the seismic forces. This not only helped the contractor to get the work done faster, but also enabled the client to go for the trial run earlier than expected.