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Tag: Post Tensioning Bar Systems​​

Hanoi Nhật Tân Bridge

Posted on by Sir Gwi

Hanoi Nhật Tân Bridge (Vietnam – Japan Friendship Bridge)

The Nhat Tan Bridge is an impressive cable-stayed bridge spanning the Red River, located north of Hanoi. The total length of the project is 8.9 km, including the 3.75 km main bridge.

The bridge serves as a new gateway to Hanoi, significantly reducing travel time to Noi Bai International Airport, the second busiest airport in Vietnam by passenger volume.

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

Dextra has been involved in the Nhat Tan Bridge since the early stages of the project, supplying the widely used Bartec® rebar couplers, the leading rebar splicing solution in Vietnam. Bartec® connections were used in various parts of the project, including approaches, foundation piles, pile caps, and bridge segments.

Bartec® couplers offer a versatile rebar splicing solution, as the same standard coupler can be used for both standard connections (where the rebar rotates into the coupler) and position connections (where only the coupler rotates, useful when rebar rotation is not possible). Dextra supplied more than 130,000 connections in total for this project, enabling the lifting of heavy elements.

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

My Home GRAVA Hyderabad, India

Posted on by Sir Gwi

My Home GRAVA Hyderabad, India

 

In the heart of Hyderabad, India, a towering testament to architectural excellence and engineering innovation is taking shape – the My Home GRAVA project. Comprising eight 43-storey towers, this mega project stands as a symbol of modern living and technological advancement in the construction industry. One of the key contributors to the success of this colossal venture is Dextra, a global leader in providing innovative solutions for the construction sector.

Optimizing Design and Construction:

My Home Construction, the visionary developer behind GRAVA, has left no stone unturned in ensuring the optimization of design and construction methodologies. From the early stages of planning, the focus has been on delivering a project that not only redefines luxury living but also sets new benchmarks for efficiency and sustainability in construction.

Dextra Couplers: A Structural Revolution:

At the core of GRAVA’s construction success is the implementation of 570,000 Groutec couplers and more than 70,000 Bartec couplers for all structural connections within the concrete frame. These couplers play a pivotal role in ensuring the structural integrity of the buildings, providing a secure and efficient connection between the precast elements.

The Groutec and Bartec couplers are known for their high-performance capabilities, making them ideal for large-scale and complex projects like GRAVA. These couplers eliminate the need for traditional lapped splicing, offering a faster and more reliable alternative for connecting and reinforcing concrete structures and precast concrete elements. This not only accelerates the construction process but also enhances the overall durability and safety of the structure.

As the My Home GRAVA project continues to rise and reshape the skyline of Hyderabad, it stands as a testament to the successful collaboration between visionary developers and innovative construction solution providers. Groutec and Bartec couplers have played a crucial role in the seamless construction of the eight 43-storey towers, contributing to the project’s efficiency, strength, and durability.

The project not only promises a luxurious living experience but also sets a new standard for construction excellence in India, with Dextra’s contribution leaving an indelible mark on its success.

 

CCTV Headquarters, China

Posted on by Sir Gwi

CCTV Headquarters, China

The CCTV Headquarters building is a landmark tower located in the Central Business District of Beijing. The tower houses the operations of China Central Television (CCTV) and has been one of the architectural landmarks of the Chinese capital since its completion in 2012.

For this project, Dextra was involved in providing China State Construction Engineering Corporation with an anchoring solution for the columns that ultimately support the building’s bridge-like complex architecture.

Anchoring the structure was particularly challenging due to the building’s height (234 meters) and its distinctive, complex shape. Additionally, since the building is located in a seismic zone, it needed to be constructed to withstand additional loads.

Dextra supplied high-tensile post-tensioning bar systems in large diameters. The post-tensioned system was designed to lock the metallic structure at the base of the mega columns and anchor them into a heavily reinforced mat.

The large PT systems (bars and plates) were equipped with additional corrosion protection accessories, including tubes and injection ports, allowing for grout sealing.

Causeway across Kuwait Bay

Posted on by Sir Gwi

Causeway across Kuwait Bay (Jaber Causeway)

 

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.

Bridge pylons and girders

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

Dextra Smooth PT Bar Grade 835/1050s were used all along the sea link for the connection of the precast girders together.

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.

Crosshole Sonic Logging tubes

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.

Once installed, the tubes are firmly in place, supporting without issue the cage lifting and handling.