MahaNakhon Tower

Posted on November 5, 2022March 15, 2024 by Sir Gwi

MahaNakhon Tower

MahaNakhon Tower is a 77-storey skyscraper in Bangkok. With a height of 314 meters, it became in 2016 Thailand’s tallest building. MahaNakhon is located in Silom, the busiest business district of Bangkok, right above the BTS Skytrain station Chong Nonsi. The project is owned by developer PACE and has been built by Bouygues-Thai.

Foundations

Foundations are always a challenge in Bangkok. The city being built on sands and humid soils, foundations must be deep and most projects feature thick D-Walls to prevent water from leaking in.

For the D-Walls of MahaNakhon, Dextra supplied rebar couplers used in the D-Walls. The couplers were mounted on hook bars, installed horizontally and cast in concrete. This typical application allow to reconnect bars to the D-Wall at at a later stage when starting the slab reinforcement.

Finally, Headed Bars were also installed in the thick foundation matt. Headed bars are an advantageous substitute to hooks in congested areas, they provide high performance anchorage and are easier to install.

Superstructure

The tower is built around a corewall, erected with slip formwork, surrounded by 12 megacolumn. To connect the columns with the corewall, Dextra supplied Bouygues-Thai with its renowned Bartec solution. Bartec couplers, installed flush with the formwork and cast in concrete, allow second phrase reconnection of bars to bridge the column and the corewall.

In the mega columns, rebar couplers were also used to perform bar-to-bar vertical connecitions.

Skybar

Finally, Dextra provided Tension Bar Systems in the rooftop skybar. Tension Bars can be easily installed with their fork ends and provide an aesthetic anchorage system.

For more information about Dextra solutions for MahaNakhon, a case study with photos is also available.

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Grand Paris Express – Line 14

Posted on November 5, 2022September 26, 2024 by Sir Gwi

Grand Paris Express – Line 14

The Grand Paris Express is a major urban transport project taking place all around the French Capital. The project will add 4 new lines (lines 15, 16, 17 and 18) and extend two existing lines (11 and 14).

Dextra has been involved on the packages of several stations through its local distributor partners. On the line 14 in particular, Dextra supplied Fortec rebar couplers in stations of Orsay and Pont Cardinet.

For the Bagneux Station in the North of Paris, located at the crossing of metro line 4 and future line 15, Dextra supplied its ASTEC Active Anchors.

ASTEC Active Anchors are the preferred solution for subway stations works as Tunnel Boring Machines and earth-moving equipment can simply cut the anchors’ FRP tendons at any stage, eliminating any need of unreliable and costly removal of anchors. The solution was approved for this project by consulting firm SYSTRA.

After numerous successful projects in the Middle East, this was the first time ASTEC Active Anchors (a recent Dextra innovation) were installed in Europe.

New Bay Bridge of San Francisco

Posted on November 5, 2022March 14, 2024 by Sir Gwi

New Bay Bridge of San Francisco

The New Bay Bridge is a large civil engineering project taking place between the years 2002 and 2013. The aim of the project was to replace two segments of the Bay Bridge vulnerable to eathquakes by a new structure designed to withstand seismic efforts.

For that project, Dextra was involved on two segments of the renovation project: the approach to Bay Bridge on the San Francisco side, and the Eastern segment from the Island of Yerba Buena to Oakland.

Dextra supplied for this project its Bartec Headed Bar systems. Headed Bars are an anchor disc mounted on the end of a rebar previously prepared for the Bartec system.

The use of Headed Bars provides an smart and compact alternative to long rebar hooks in areas where the reinforcement is particularly congested. Unlike hook bars, Headed Bars are particularly easy to install, as end anchors can just be screwed onto the reinforcement at a later stage, after the reinforcement is installed.

For the approach to the Bay Bridgee in San Francisco and the Yerba Buena Eastern Segment, Bartec Headed Bars were used for the shear reinforcing of the column foundations, as well as in the bridge hinges.

The Bartec Headed Bars solution is approved by CALTRANS, the California Department of Transportation, for all imperial bar size #3 to #18. and is also certified by the ICC-ES.

Flamanville EPR

Posted on November 5, 2022March 14, 2024 by Sir Gwi

Flamanville EPR

Flamanville is the first reactor built after the new generation EPR design (European Pressurized Reactor), after a 100% Chinese design. It will have a capacity of 1.3GWe when entering service in 2019.

Dextra has been present on site since the beginning of the construction works in 2008 and until 2015.

For this challenging project, Dextra has been supplying its Griptec rebar splicing solution through its local fabricator partners. The rebar preparation was supported by an additional machine placed at site.

Griptec is the preferred rebar splicing solution of the nuclear industry thanks to its unique performance level and an automatic testing process which systematically tests all the connections produced as part of its standard cycle: a guarantee that 100% of the connections perform above project requirement.

More than 800,000 Griptec connections have been used on the project, including 400,000 position assemblies, allowing to connect large diameter rebar without rotating them. The Griptec connections have been installed on reactor building and APC shell, as well as auxiliary buildings.

In particular, Griptec have been used for the connections of large prefabricated panels.

Four sided panels with Griptec female sleeves and bridging studs

Thanks to its Bridging Assemblies, square panels could be reconnected on four sides while coping for possible misalignment that occur when lifting the cage.

Hanoi Nhật Tân Bridge

Posted on November 5, 2022March 14, 2024 by Sir Gwi

Hanoi Nhật Tân Bridge (Vietnam – Japan Friendship Bridge)

The Nhat Than Bridge is an impressive cable-stayed bridge spanning over the Red River and located North of Hanoi. The total length of the project is 8.9 km, including the actual3.75 km bridge.

The bridge is the new gateway to Hanoi as it greatly reduces the transport time to Hanoi Noi Ban Airport, the second busiest airport of Vietnam in passengers.

The bridge was inaugurated by the Ministry of Transport of Vietnam and opened to the public on the 4th of January 2015. The bridge has since theen been renamed “Vietnam – Japan Friendship Bridge).

Dextra has been involved on the Nhat Tan bridge since the early stage of the project by supplying the popular Bartec rebar couplers, the main rebar splicing solution in Vietnam. Bartec connections were used in various part of the project: approaches, foundation piles, pile caps and approaches.

Bartec couplers make a convenient rebar splicing solution as the same standard coupler can be used for standard connection (rotating rebar into coupler) and position connection (rotating only coupler, when it is impossible to rotate rebar). Dextra supplied more than 130,000 connections in total for this project for the lifting of heavy elements.

For the temporary operations of lifting and fixing of the girder precast segments, Dextra also supplied 36 tons of high-tensile PT bars.

Ciel Tower Dubai

Posted on November 5, 2022March 14, 2024 by Sir Gwi

Ciel Tower Dubai

Ciel Tower is an 82-storey high-rise building under development in Dubai Marina. With a total height of 365 meters, the building is set to become the world’s tallest hotel upon its completion, scheduled in late 2023.

The tower is situated at the heart of the Marina, near popular attractions like the Marina Walk and the Marina Mall shopping and entertainment complex. It will house 1,042 luxury suites with a rooftop that hosts a pool bar, a restaurant, and an observation deck.

The structure is heavily inspired by the concept of vertical living, to maximize views of Palm Jumeirah, Blue Waters Island, Dubai Harbour and the Arabian Gulf.

Dextra has supplied 180,000 Bartec couplers for the connection and enhancement of rafts, columns to beams, slabs to core walls, core walls and starter bars.

Ciel Tower is a remarkable project that will become a new landmark and further enhance Dubai’s reputation as one of the world’s most popular touristic destinations.

Source of images: https://www.archdaily.com/931860/ciel-the-worlds-tallest-hotel-is-under-construction-in-dubai-marina, https://propsearch.ae/dubai/ciel-tower

India’s Tallest Commercial Building built with Precast Technology

Posted on November 5, 2022March 15, 2024 by Sir Gwi

India’s Tallest Commercial Building built with Precast Technology

Orbit is a 25-storey office building located strategically in the heart of the IT Hub of Hyderabad being constructed with precast technology. It is the tallest commercial buildings in India made with precast technology.

The Orbit building constructed by Aurobindo Realty was awarded the “Best Office Architecture India” award by International Property Awards- Asia Pacific Property Awards 2018.

As it is designed with Precast technology, the building is also proposed for LEED V4 Gold Rating from USGBC, a certification that guarantees our commitment to environmental friendliness and sustainability.

Dextra Groutec played a key role in precast element connection. Around 60,000 couplers were installed in the precast elements at the precast factory, and then transported to the site to perform a grout connection.

Groutec couplers are widely used in response to the increased demand for modular buildings around the world, especially during this Covid-19 outbreak with more requirements for healthcare and quarantine buildings. They are designed and manufactured in accordance with Eurocode 2, BS 8110, ACI 318, IBC, and AASHTO.

Source of images: https://www.aurobindorealty.com/portfolio/orbit/

Cartagena Viaducto Del Manglar

Posted on November 5, 2022March 14, 2024 by Sir Gwi

Cartagena Viaducto Del Manglar

The Viaducto del Manglar project is a 5.3 km bridge project spanning over the Ciénaga de la Virgen (swamp), north of the City of Cartagena, Colombia. The project aims to reduce traffic congestion when exiting the city in the Zona Norte (North Area).

The viaduct, which aims for opening in 2018, is part a longer highway project linking the city of Cartagena with the city of Baranquilla.

For this project in Colombia, Dextra has been supplying contractor Rizzani de Eccher with Rolltec rebar couplers and Headed Bars. Rebar preparation operations has been performed by Dextra distributor in Colombia.

Headed Bars were used in precast caissons, installed below the bridge girders, as a way to reduce steel congestion in the heavily reinforced steel cages.

For more information about Dextra solutions in Colombia, please contact our regional Latin America office.
Copyright pictures: Consesion Costera

Two IFC (International Finance Centre)| 環球貿易廣場

Posted on November 5, 2022March 15, 2024 by Sir Gwi

Two IFC (International Finance Centre)| 環球貿易廣場

The Two IFC is a landmark skyscraper in Hong Kong, located in West Kownloon. The commercial building is 412 meters high and features 88 floors. It is the second tallest building in Hong Kong, right after the ICC Tower.

Vertical reinforcement is by definition a key feature for buildings of that height. Consultant ARUP and contractorsE-Man-Sanfield JV picked Dextra for the splicing of reinforcement across the building.

For this project, Dextra supplied more than 200,000 rebar couplers. Those were used to perform most vertical connections on the structure, in particular all columns.

Rebar couplers also provided connection points for second phase rebar reconnection. Typically between columns and slabs, and between columns and beams. To do so the rebar coupler are aligned horizontally and cast in concrete. Reconnection is only performed at a later stage by screwing in second stage rebar.

Bartec is the preferred reinforcement splicing solution of contractors in Hong Kong as the solutionis recommended in the Hong Kong Building Material List.Dextra also operates its own rebar threading workshopin Hong Kong, providing the rebar preparation service for its customers.

Mandovi River Cable Stayed Bridge

Posted on November 5, 2022March 14, 2024 by Sir Gwi

Mandovi River Cable Stayed Bridge

The 3rd bridge over the river Mandovi in Goa is an iconic bridge that connects Panaji in Tiswadi Taluka and Porvorim in Bardez Taluka in between the existing two bridges to ease traffic congestion along this route. It was declared open on January 27, 2019.

As one of the longest cable stayed bridges in India, the 4-lane, 21m-wide, 620m-long continuous span, 3.6 km Mandovi River Cable Stayed Bridge adds architectural beauty to Panaji, standing tall 70m above sea level with the central concrete pylons spaced at 150m, supported by 88 cables on a single plane, harp type cable stay arrangement.

Dextra supplied 1,170 sets of fully-threaded post-tensioning bar systems in diameter 25, 32, 40, 50 and 75mm, in grade 830/1030 for use in various applications.

Hanger bars

Vertical prestressing

Horizontal prestressing bars

Lifting bars

Anchoring pier head segment with pier cap

Anchoring front support to the pier cap

Anchoring of front cantilever support to the pier cap

Anchoring of middle, rear, and auxiliary supports

Category: Projects