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Chennai Metro Phase 2, India

 

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

 

Mumbai Metro Line 2B, India

 
 

El 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 Barra CR 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.

Central Kowloon Route (CKR) – Central Tunnel, Hong Kong

 

Central Kowloon Route (CKR) – Central Tunnel, Hong Kong

 
 

Dextra played a pivotal role in the construction of the Central Kowloon Route (CKR) – Central Tunnel project in Hong Kong by supplying Fortec+ couplers, along with steel rock bolts, expandable friction bolts, umbrella pipes, and post-tensioning bars for tunneling works. These mechanical rebar couplers were integral in ensuring strong and reliable connections within the road tunnel structure, meeting the stringent requirements for safety and durability.

The CKR, a major infrastructure project aimed at improving traffic flow across Kowloon, required advanced construction techniques. Dextra’s Fortec+ couplers, used in locations such as precast panels, tunnel access points, and driveways, contributed significantly to the project’s structural integrity and long-term performance. The Fortec+ system includes a rebar preparation process in which the threaded bar end is proof tested with a tensile load, ensuring non-destructive testing within the elastic zone of the reinforcing bar.

 

Image credit: Central Kowloon Route – Highways Department

San Shek Wan Sewage Treatment Works, Hong Kong

 

San Shek Wan Sewage Treatment Works, Hong Kong

 
 

The San Shek Wan Sewage Treatment Works (STW) project in Hong Kong marks a significant step towards addressing the sewage disposal needs of the South Lantau region. As the population of South Lantau is projected to grow, with an ultimate population reaching approximately 12,600 by 2039, the sewage flow is anticipated to increase to 5,800 m³/day. To accommodate this, a comprehensive sewerage system is being constructed, which includes a trunk sewerage system for Pui O area, a secondary STW at San Shek Wan, and a village sewerage system for Lo Uk.

A critical component of this ambitious infrastructure project is the use of advanced materials and technologies to ensure its successful and sustainable completion. Dextra, a global leader in engineered construction products, has played a pivotal role by supplying Glass Fibre Reinforced Polymer (GFRP) soil nails for the excavation and lateral support (ELS) works.

The Role of GFRP Soil Nails in ELS Works

The excavation and lateral support works are essential to the project’s foundation and stability. The challenging geotechnical conditions in Hong Kong, characterized by complex soil and rock formations, necessitate the use of robust and reliable reinforcement solutions. GFRP soil nails, provided by Dextra, are ideal for such conditions due to their high tensile strength, corrosion resistance, and lightweight nature.

GFRP soil nails are used to stabilize slopes and excavations, preventing landslides and soil erosion. Their corrosion resistance is particularly beneficial in environments exposed to moisture and chemicals, such as sewage treatment works. This ensures a longer lifespan and reduced maintenance costs compared to traditional steel reinforcement.

Benefits of Dextra’s GFRP Solutions

  1. Corrosion Resistance: Unlike steel, GFRP does not corrode when exposed to harsh environmental conditions. This makes it an excellent choice for the wet and chemically aggressive conditions present in sewage treatment works.
  2. High Strength-to-Weight Ratio: GFRP offers a high tensile strength comparable to steel but at a fraction of the weight. This ease of handling and installation translates to time and labor savings.
  3. Durability: The longevity of GFRP soil nails ensures the structural integrity of the excavation and lateral support systems over the extended operational life of the sewage treatment works.
  4. Sostenibilidad: By using GFRP, the project reduces its reliance on steel, thereby contributing to more sustainable construction practices.

Impact on the San Shek Wan STW Project

Dextra’s involvement and the implementation of GFRP soil nails have significantly enhanced the efficiency and sustainability of the San Shek Wan STW project. The advanced materials have ensured that the excavation and lateral support works are not only robust and reliable but also cost-effective over the long term.

Upon completion, the sewage from South Lantau will be conveyed to the newly constructed STW for proper treatment. The treated effluent will then be safely discharged into the sea about 1.4 km off the South Lantau coast, ensuring minimal environmental impact. This project represents a crucial infrastructure upgrade that will support the region’s growth and development while maintaining high environmental and operational standards.

 

Cairo Monorail Bowstring Bridge, Egypt

 

Cairo Monorail Bowstring Bridge, Egypt

 
 

The Cairo Monorail Bowstring Bridge project, a pivotal part of Egypt’s expanding urban infrastructure, has significantly benefited from the expertise and quality products supplied by Dextra. Known for their innovative engineering solutions, Dextra provided critical materials to support the construction of this state-of-the-art transportation link.

In particular, Dextra supplied tension rods in two distinct specifications for the project:

  1. M78/OD75 in Grade CS520 – A total of 60 sets were delivered.
  2. M83/OD80 in Grade CS520 – An additional 8 sets were provided.

These tension rods were specifically used as hangers for the bowstring bridge, ensuring a high level of strength and durability, which is crucial for the safety and longevity of the bridge, to maintain structural integrity and withstand the stresses of daily monorail operations.

Dextra’s tension rods, known for their high tensile strength and resistance to environmental factors while providing architectural pleasure, played a critical role in meeting these demands. This involvement underscores the importance of reliable and advanced engineering solutions in modern infrastructure projects, highlighting Dextra’s commitment to excellence and innovation in the field of civil engineering.

 

Cross Island Line (CRL) MRT, Singapore

 

Cross Island Line (CRL) MRT, Singapore

 
 

dextra has played a pivotal role in the construction of Singapore’s Cross Island Line (CRL) MRT project, supplying Glass Fiber Reinforced Polymer (GFRP) soft-eyes, bartec couplers and Barras con cabeza for several crucial packages. dextra continues to support the ongoing packages of this extensive project.

The CRL is set to become Singapore’s eighth MRT line and its longest fully underground line, stretching over 50 kilometers. The project is being executed in three phases, with the first phase anticipated to be operational by 2030.

To minimize the environmental impact on the forested areas of the nature reserve, engineering solutions were meticulously chosen to further mitigate environmental disruption. These solutions include digging deeper into the ground and employing a large diameter boring machine, capable of accommodating two train tracks within a single tunnel. This approach not only reduces the surface footprint but also enhances the efficiency of the tunneling process.

Tunnel Boring Machines (TBMs) are a staple in Singapore’s subterranean infrastructure projects, adept at operating under a variety of ground conditions. The use of GFRP soft-eyes supplied by dextra is integral to these operations. Soft-eyes are essential components in TBM tunneling, acting as temporary openings that allow the TBM to break through concrete walls without compromising structural integrity. The GFRP material is preferred for its high strength-to-weight ratio, corrosion resistance, and ease of installation, ensuring safe and efficient tunneling operations.

dextra‘s expertise and reliable supply of GFRP soft-eyes, bartec couplers and headed bars have significantly contributed to the progress of the CRL project, aligning with Singapore’s commitment to sustainable and innovative infrastructure development. As the CRL project advances, dextra remains a key partner, supporting the construction of this monumental MRT line that will eventually enhance the daily commute for millions of Singaporeans.

 

Grand Paris Express – Line 14

Grand Paris Express – Line 14

El Grand Paris Express es un importante proyecto de transporte urbano que se desarrolla en toda la capital francesa. El proyecto añadirá 4 nuevas líneas (líneas 15, 16, 17 y 18) y ampliará dos líneas existentes (11 y 14).

Dextra ha participado en los paquetes de varias estaciones a través de sus socios distribuidores locales. En particular, en la línea 14, Dextra ha suministrado acopladores de varilla Fortec en las estaciones de Orsay y Pont Cardinet.

Para la estación de Bagneux en el norte de París, situada en el cruce de la línea 4 del metro y la futura línea 15, Dextra suministró sus anclajes activos ASTEC.

Los anclajes activos ASTEC son la solución preferida para las obras de estaciones de metro, ya que las máquinas perforadoras de túneles y los equipos de movimiento de tierras pueden simplemente cortar los tendones de FRP de los anclajes en cualquier etapa, eliminando cualquier necesidad de retirar los anclajes de manera poco confiable y costosa. La solución fue aprobada para este proyecto por la consultora SYSTRA.

Después de numerosos proyectos exitosos en Medio Oriente, esta fue la primera vez que se instalaron anclajes activos ASTEC (una innovación reciente de Dextra) en Europa.

Ampliación de las obras de tratamiento de aguas residuales de Sha Tau Kok Fase 1

Ampliación de las obras de tratamiento de aguas residuales de Sha Tau Kok Fase 1

El proyecto de expansión de la Fase 1 de la Planta de Tratamiento de Aguas Residuales de Sha Tau Kok es un testimonio del compromiso de Hong Kong con la sostenibilidad ambiental y la gestión eficiente de las aguas residuales. Su objetivo es aumentar la capacidad de tratamiento, asegurando que las aguas residuales de la ciudad se procesen de manera eficiente y ambientalmente responsable. Una característica destacable de esta ampliación es el uso de acopladores Groutec S para unir perfectamente las columnas prefabricadas del edificio.

Groutec está diseñado para la instalación fácil y eficiente de elementos prefabricados de hormigón, reduciendo el tiempo de construcción y los costos de mano de obra al tiempo que proporciona una conexión estructural completa. Para este proyecto, se han utilizado acopladores prefabricados Groutec S de 32 mm de diámetro para conectar columnas prefabricadas en aplicaciones verticales. El acoplador Groutec se instala en el elemento inferior y luego la lechada se vierte por gravedad directamente en la cavidad del acoplador. Este proceso garantiza la integridad estructural y la longevidad de la instalación.

Estación de metro Msheireb de Doha

Estación de metro Msheireb de Doha

La estación Msheireb es la principal estación de intercambio del metro de Doha. Ubicado en el centro de Doha, conecta las tres líneas (roja, verde y dorada) y proporcionará una puerta de entrada a los estadios de la Copa Mundial de la FIFA 2022.

La estación Msheireb se convertirá en una de las estaciones de metro más grandes del mundo por tamaño.

Ojos blandos para tuneladoras

Para este importante proyecto, Dextra diseñó y suministró entre 2013 y 2015 8 grandes Soft-Eyes ASTEC GFRP, de un diámetro de 8 metros cada uno. Los Soft Eyes son jaulas de barras de refuerzo de GFRP, colocadas en las paredes D entre los segmentos de acero. Los Soft-Eyes de GFRP permiten que las tuneladoras (TBM) pasen en un tiempo mínimo, ya que las barras pueden ser aplastadas fácilmente por la tuneladora.

Anclajes de amarre

Para anclar los enormes muros d y evitar cualquier desplazamiento del suelo durante los trabajos de excavación, Dextra también suministró sus anclajes activos ASTEC (AAA). Estos innovadores anclajes postensados a base de GFRP tienen la ventaja de poder ser cortados con tuneladoras o equipos de excavación estándar. Debido a que se puede cortar fácilmente, no es necesario retirarlo del suelo, incluso cuando se usa para aplicaciones temporales.

En el caso de las estaciones de Msheireb, incluso se han instalado anclajes multitendones (10 por anclaje en este proyecto) en el centro de Soft-Eye para anclar el D-Wall. Esas anclas también fueron cortadas durante la perforación del túnel (visible en el video a continuación). En total se instalaron 150 anclajes en la estación.

BTS de Bangkok

BTS de Bangkok

El sistema de transporte masivo de Bangkok (BTS) es un gran sistema de tren aéreo urbano ubicado en Bangkok, la capital de Tailandia. El sistema fue inaugurado en 1999.

A partir de 2017, el sistema consta de 24 estaciones elevadas y 37 km de vías elevadas organizadas en dos líneas principales que se cruzan en la estación central de Siam.

El sistema BTS está realizando una ampliación de sus dos líneas principales y se espera que segmentos de línea y estaciones entren en funcionamiento en 2019 y 2020.

Cimientos

Para varios paquetes a lo largo de los años, Dextra ha suministrado tubos Sonitec, que se utilizan para probar los cimientos de pilotes de hormigón debajo de las estaciones y los rieles.

En total, Dextra suministró aproximadamente 40.000 metros lineales de tubos Sonitec, una distancia realmente equivalente a la longitud del propio sistema BTS.

Pilones

Para conexiones de barras verticales de pilones, Dextra ofrece su
bartec conexión.
bartec permite empalmar cómodamente jaulas de barras de refuerzo prefabricadas mediante el uso de un acoplador de barras de refuerzo simple, lo que permite ahorrar acero en comparación con el traslape y acelera las operaciones en el sitio.

En Tailandia, la operación de roscado cuenta con el respaldo de la fábrica de Dextra, convenientemente ubicada en el noreste de Bankgok. Los contratistas reciben las barras de refuerzo ya preparadas y montadas con su acoplador de barras de refuerzo.

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