Chennai Metro Phase 2, India

Posted on November 8, 2024November 8, 2024 by Kansuda Visesthanakorn

Chennai Metro Phase 2, India

The Chennai Metro Phase 2 project is set to redefine urban transportation in one of India’s largest cities, promising enhanced connectivity and efficiency. Playing a pivotal role in the success of this ambitious project, Dextra has supplied an array of cutting-edge construction solutions to meet the project’s demanding structural and safety requirements.

Ensuring Robust Connections with Bartec Rebar Couplers

Dextra supplied nearly 2 million Bartec rebar couplers, essential for creating secure connections across various structural components. These couplers have been utilized extensively in the connections for diaphragm wall (d-wall) caging and slabs, pile cages, piers, and pier caps. By ensuring high-strength rebar connections, Bartec couplers contribute to the overall durability and resilience of the metro structure, particularly important in a densely populated and busy urban environment like Chennai.

Precision Testing with Sonitec CSL Testing Tubes

To ensure the highest standards of concrete integrity, Dextra provided over 80,000 Sonitec crosshole sonic logging (CSL) testing tubes. These tubes facilitate rigorous testing of piles and d-walls, helping to identify potential flaws within the concrete structure. This meticulous testing process enables project engineers to detect and address any irregularities, safeguarding the integrity and longevity of the metro’s foundations.

Supporting Complex Structures with CR Bar 1080 Post-Tensioning Bars

For the support of double-decker piers and the pre-tensioning of U-girders, Dextra supplied 68 CR Bar 1080 post-tensioning bars. These high-strength, fully threaded bars are critical in handling the complex loads and stresses that the elevated sections of the metro will endure. The inclusion of these bars ensures that the metro can withstand heavy traffic and operational demands over time, contributing to the long-term safety and functionality of the infrastructure.

Facilitating Tunnel Boring with GFRP Soft-Eyes

In the tunneling phase, Dextra also provided 42 GFRP soft-eyes, specifically designed for tunnel boring machine (TBM) operations. These soft-eyes allow TBMs to pass through concrete walls smoothly, ensuring safe and efficient tunneling while reducing the risk of structural damage. GFRP’s non-corrosive properties make it an ideal choice for underground construction, where durability and performance are paramount.

Building a Safer, Stronger Future

Dextra’s commitment to supplying top-tier construction materials and solutions underscores its dedication to the Chennai Metro Phase 2 project. As the metro takes shape, Dextra’s innovations contribute not only to the project’s success but also to the future of Chennai’s urban infrastructure, setting new standards in construction excellence and sustainability.

Mumbai Metro Line 2B, India

Posted on September 25, 2024September 25, 2024 by Kansuda Visesthanakorn

Mumbai Metro Line 2B, India

The Mumbai Metro Line 2B, an essential link connecting several key areas of the city, is a significant infrastructure project aimed at alleviating Mumbai’s traffic congestion and providing efficient public transport. As part of this ambitious project, Dextra has made a valuable contribution, supplying engineered construction materials to ensure the durability and reliability of the structure.

CR Bar 1080 for U-Girder Stressing and Pre-Tensioning

One of the critical components of the project is the elevated section of the metro, which relies on U-girders for support. To enhance the strength and resilience of these U-girders, Dextra supplied its innovative CR Bar 1080 cold-rolled fully threaded post-tensioning bars. These bars, with a diameter of 75mm, are specifically designed to withstand high stress during both U-girder stressing and pre-tensioning operations. The hexagonal nuts provided as part of the system allow for secure fastening and easy adjustment, ensuring precise tensioning to meet the structural demands.

Fully Threaded (FT) Bar for Segment Stitching and Temporary Stressing

For segment stitching and temporary stressing operations during the construction of the metro viaduct, Dextra supplied its fully threaded (FT) bars. These bars provide secure connections between precast segments and offer flexibility for adjustments during the stitching process, ensuring that the structural alignment is perfect before the segments are permanently joined.

Unitec Couplers for Rebar Connections

In addition, Dextra supplied Unitec couplers, designed for connecting rebars at construction sites without the need for pre-threading. These couplers offer a convenient and robust solution, allowing for seamless connection of two rebars, ensuring structural continuity and strength without delays in the construction process.

Sonitec CSL Testing Tubes for Concrete Pile Integrity

In addition to supplying post-tensioning bars, Dextra also provided Sonitec Crosshole Sonic Logging (CSL) testing tubes for the integrity testing of the concrete piles supporting the metro structures. These tubes enable highly accurate non-destructive testing of the concrete, allowing engineers to detect any potential flaws or weaknesses in the piles. This testing is vital for ensuring the piles meet the necessary strength and quality standards, thereby supporting the entire metro system safely and effectively.

Enhancing Metro Connectivity with Quality Solutions

As the Mumbai Metro Line 2B progresses towards completion, Dextra’s contributions to the project highlight its role in providing advanced engineering solutions for infrastructure development. The combination of CR Bar 1080 for post-tensioning, fully threaded bars for segment stitching, Unitec couplers for rebar connection, and Sonitec CSL testing tubes for pile integrity showcases Dextra’s commitment to quality, innovation, and safety in major construction projects.

By contributing to this key metro line, Dextra is playing a part in shaping the future of urban mobility in Mumbai, ensuring that the metro system will be reliable and capable of supporting the city’s growing transportation needs for years to come.

King Abdullah Financial District

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

King Abdullah Financial District

King Abdullah Financial District (KAFD) is a multipurpose business and residential complex located in Riyadh, Saudi Arabia. The district consists of more than 50 towers and should ultimately host a working population of around 12,000 inhabitants.

Dextra Middle-East, also located in Dubai, has been involved from2009 for the supply of several building packages to Saudi Bin Ladin Group, the main contractor on the project.

Foundations piles

In order to provide vertical connection in foundation piles, Dextra supplied through its partners fabricators its popular
Bartec rebar coupler solution, the #1 rebar splicing solution in the Middle East.

As a complement to Bartec couplers, Dextra also supplied Unitec couplers, which were used for the continuation of bars protruding from the foundation piles. Unitec is a flexible solution for contractors as the bar end doesn’t need to be prepared in advance. It only requires an impact wrench and therefore it is easy to operate on remote building sites.

Raft and Columns

Bartec couplers were also used for the horizontal connection in the thick foundation rafts, and vertically in the protruding columns.

Corewall-to-beam applications

In the building superstructure, Dextra Bartec couplers were used to provide horizontal connection from the corewall, allowing to insert the second phase starter bars needed to create the beam reinforcement.

Parque Da Cidade in São Paulo

Posted on November 4, 2022February 6, 2024 by Sir Gwi

Parque Da Cidade in São Paulo

Parque Da Cidade is a multi-tower multi-purpose green building complex located in the south of São Paulo. The project hosts 5 corporate office towers, a hotel, residential buildings and a shopping mall.

For this project, DextraDoBrasildelivered to contractor Odebrecht its Rolltec rebar coupler solution.

Rolltec is the most popular rebar slicing solution in Brazil, providing a competitive alternative to lap splices and more importantly allowingadvanced applications simplifying project management and operations.

For Parque Da Cidade, Rolltec rebar couplers were used to provide a connection between the columns and the beams. The solution was supported by a Rolltec equipment installed at site and maintained by our Dextra local engineers.

For that application, rebar couplers are aligned horizontally in the column reinforcement at each floor and cast in concrete. Dextra provide its couplers with thread protection cap so there is no risk of liquid concrete leaking into the coupler.

At a later stage of the project, continuation bar can be connected directly into the couplers, providing convenient starter bars for the beam or slab reinforcement.

Furthermore, on Parque Da Cidade, Dextra delivered its Unitec solution. Unitec is a bolted coupler that doesn’t require any rebar preparation. It was used on Parque Da Cidade to provide connection between the rebar protruding from two precast elements.

Jamnagar refinery expansion

Posted on November 4, 2022March 14, 2024 by Sir Gwi

Jamnagar refinery expansion

Located in the Gujarat, in western India, the Jamnagar refinery is the largest in the world in production capacity. Owned by Reliance Industries, it has been commissioned in 1998 and spreads over the 50 km2 surface area.

For the phase 3 alone, more than 305,000 tons of steel reinforcement were used: a 36 months project involving more than 100,000 engineers and construction workers.

Dextra has been involved in Jamnagar since the early days and supplied its rebar splicing solutions on the phases 1, 2 and 3 of the project.

For the phase 3 especially, 3 rebar coupler solutions were used:

Bartec solution was used for cast in situ applications, for bar-to-bar connections in foundations, pile cages, column cages. Bartec couplers were also used as a way to splice bars in heavily congested rafts and pile caps.

For the pipe-racks, which were built from precast elements, from a precast factory part of the project. Groutec couplers have been used to connect beams and columns. Positionned in the bottom elements and filled with grouts, they conveniently avoided the need of in situ wet joint.

For other applications where rebar length is too short to allow traditional overlap, Unitec couplers were used.

For more information on Jamnagar, please download our Case Study.

AVE Palencia-Santander HSR Package 1 (Palencia – Palencia Norte) & Package 2 (Palencia Norte – Amusco)

Posted on November 3, 2022March 14, 2024 by Sir Gwi

AVE Palencia-Santander high-speed rail project is a significant infrastructure undertaking aimed at connecting Palencia and Santander in Spain. This project involves the construction of extensive railway networks, viaducts, and bridges, underscoring the need for a strong and resilient foundation. Recognizing the critical importance of ensuring the structural integrity of the concrete piles, the project management sought advanced testing methodologies.

Dextra played a pivotal role in ensuring the robustness of the project’s foundation by supplying Sonitec Crosshole Sonic Logging (CSL) testing tubes. These tubes were instrumental in conducting comprehensive structural integrity tests on the concrete piles of AVE Palencia-Santander USR Package 1 (Palencia – Palencia Norte) and Package 2 (Palencia Norte – Amusco).

Crosshole Sonic Logging is a non-destructive testing method widely employed to assess the quality and integrity of concrete piles. It involves the use of sonic waves transmitted through the concrete between two access tubes, allowing engineers to evaluate the material’s properties and identify potential defects.

Sonitec tubes are specially designed for Crosshole Sonic Logging, ensuring precise and reliable data collection during structural integrity tests. These tubes are embedded in the concrete piles during construction, providing access points for the sonic wave transmission.

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