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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New Champlain Bridge

Posted on November 5, 2022March 16, 2024 by Sir Gwi

New Champlain Bridge

The new Champlain Bridge is a 3km long bridge spanning over the Saint Lawrence River at the South-East entrance of Montreal, in the province of Quebec (Canada). 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.

Replacement of the older Champlain bridge

The New Champlain bridge will actually replace the existing Champlain bridge, commissioned in June 1962. The structure of the older bridge started showing signs of corrosion since 1994. After several temporary solutions to ensure safety of users and keep the bridge open, a new replacement project has been in the works since 2007. For some times the two bridges will be next to each other until the older structure is completely removed, with most of its structure planned to be recycled.

A focus on corrosion resistance

As the New Champlain Bridge is designed to operate at least 125 years and handle 50 million car crossing per year. Because of the relatively corrosive environment caused by the frequent de-icing on the road, a strong focus was made on the corrosion resistance of the structure with duplex stainless steel rebar being installeed in critical areas.

For this project, Dextra suggested the use Duplex Stainless Steel Rolltec couplers and anchors. This sub-range of our popular Rolltec solution substitutes the main products of our Rolltec range, coupler and anchors, by and improved alternative duplex steel version.

The Rolltec solution is well fit for the Canadian market and approved by the Quebec Ministry of Transport. With a single operator threading equipment and 30sec cycles, it is highly productive, which is ideal for high-labor cost countries such as Canada.

More than 10,000 Stainless Rolltec couplers have been delivered for this project, used mostly in the span of the bridge. Couplers were used to splice the reinforcement on large bars, from bar diameter 35M (#11) to 55M (#18), which is actually the largest diameter in our Rolltec range.

In addition, about 10,000 Rolltec stainless steel end anchors have been delivered, for sizes up to 55M (#18). The Rolltec Headed Bars are using the same thread system as the coupler, simplifying production.

Taishan EPRs 1&2

Posted on November 5, 2022April 3, 2024 by Sir Gwi

Taishan EPRs 1&2

Taishan EPRs are two nuclear reaclors of EPR type of 1750 MW capacity built by Areva and located near Taishan, in the Guangdong province of China.

Dextra has been present on site since the beginning of the construction in 2009 and until 2016. The reactor operations are planned to start in 2017.

For this challenging project, Dextra has been supplying its Griptec rebar splicing solution, used in the concrete structure of the reactor.

Bartec rebar coupler solution as well as Headed Bars were also used on other building of the project.

Tag: headed bars