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Categoría: Transporte

Metro de Chennai

Publicado en por Sir Gwi

Metro de Chennai

The Chennai Metro is an urban transport system in the city of Chennai, a large and fast-developing city in the south of India. The system comprises four lines, partly underground and partly elevated, and a total of 42 stations. Construction started in 2009, with the first line opening to the public in 2015. The total planned length of the system exceeds 45.1 km.

Underground Stations

For this large construction project, Dextra was involved between 2011 and 2015 in the design, engineering, and supply of 61 FRP Soft Eyes for station entry/exit points as well as TBM insertion/extraction shafts.

Thanks to the properties of FRP material, Tunnel Boring Machines cut through the D-Wall in minimal time, saving time in the schedule and ensuring the perfect condition of the TBM’s head.

Elevated Segments

As a complement to Soft-Eyes for underground parts of the lines, Dextra also supplied Post-Tensioning Bar Systems for permanent applications.

The PT systems connect piles and precast segments of the elevated viaduct (shear key and hold-down applications). Each bar system, composed of high-tensile performance bars, plates, and nuts, is post-tensioned to provide seismic resistance.

For each of the 1,000 sets used on the Chennai Metro, Dextra also supplied the corrosion accessories necessary for this type of permanent application.

D-Walls

Finally, 350,000 Bartec couplers were also used vertically and horizontally in the station D-Walls.

Horizontal connections are performed with couplers left pending. Reconnection is done once the station is excavated, with second-phase rebar being reconnected to start the slabs.

Línea 4 del Metro de Río

Publicado en por Sir Gwi

Línea 4 del Metro de Río

Rio de Janeiro Line 4 is a subway line that is partly elevated and partly underground, with two segments. The line was planned to open for the 2016 Rio de Janeiro Summer Olympics.

Dextra was involved between 2013 and 2015 in the design, engineering, and supply of four large FRP Soft-Eyes for station entry/exit points. These Soft-Eyes were the first ever delivered on the South American continent.

Prior to D-Wall construction, Dextra engineered the FRP cage design, taking into account the size of the TBM, margin for error, soil forces, and other design parameters.

Thanks to the properties of FRP material, Tunnel Boring Machines cut through the D-Wall in minimal time, saving time in the schedule and ensuring the perfect condition of the TBM’s head. The time factor is especially important in humid environments such as Rio to limit water entry into the station excavations.

On this project, Dextra also supplied Rolltec Rebar Couplers, used as vertical connectors in the station diaphragm walls to reconnect cages.

Couplers were also used horizontally to reconnect slabs at station level and at the surface in the D-Walls.

Metro de Nagpur, alcance-1 (Línea 1)

Publicado en por Sir Gwi

Metro de Nagpur, alcance-1 (Línea 1)

Nagpur, the second capital of Maharashtra and one of the fastest developing cities in India, is witnessing major growth in terms of infrastructure. The development primarily focuses on connectivity, with the Metro rail playing a major role.

Launched in 2016, the metro project has been widely praised for its speed of execution and the quality of construction.

Within the city boundaries, the project requires the highest safety standards, including seismic analysis for structural integrity throughout its service life.

Project Requirements

The fast-track project features a typical structure for its Line 1 alignment, where the viaducts support two levels of pathways: the lower one for NH-7 and the upper one for the metro rail.

Impact loading due to train movement was a major concern. Since the stretch is always busy with traffic, a solution was required that would not require revising the existing design. Additionally, minimizing delays to this fast-moving project was critical, a concern shared by all stakeholders, especially the General Consultant (GC), who sought to maintain project agility while ensuring a sustainable solution.

Solución

Dextra introduced Shear Key Bars for the priority section, allowing the structure to neutralize seismic forces. This not only helped the contractor complete the work faster but also enabled the client to conduct the trial run earlier than expected.

Metro de Doha, Línea Dorada – Estación Al Sadd C-Ring

Publicado en por Sir Gwi

Metro de Doha, Línea Dorada – Estación Al Sadd C-Ring

The Doha Metro is a rapid transportation system designed as an integral component of the larger Qatar rail network. This country-wide, mega-scale infrastructure project consists of 300 km of rail and 100 stations. The rail network aims to reduce traffic congestion and connect the people of Qatar with the rest of the GCC region.

At the city scale, the metro is currently under construction and projected to be operational by the end of 2019. It will serve Doha and its surrounding suburbs, with stations located in all major nodes of the metropolis. The Doha Metro will operate both at grade and below grade, with the majority of the metro project being underground. Dextra’s complex tunneling and soil-retaining solutions were utilized in the construction of this project.

Glass Fiber Reinforced Polymers (GFRP) Used as Tie-back Anchors to Retain Soil

To eliminate concerns of encroachment and obstacles for future construction projects, the Diaphragm Wall (D-Wall) at Al Sadd C-Ring Station was post-tensioned and anchored with ASTEC Active Anchors. These high-performance, fully cuttable GFRP anchors were chosen by ALSYJ JV contractors as the D-Wall anchors of choice.

This innovative solution was selected because it can be cut by Tunnel Boring Machines (TBMs) or standard excavation equipment, and it does not need to be removed from the ground, even in temporary applications.

For Al Sadd C-Ring Station, 7,113 strands of GFRP rebars were used to make approximately 700 ground-retaining anchors in the D-Wall around that station.

2do Saneamiento Ambiental HCMC

Publicado en por Sir Gwi

2do Saneamiento Ambiental HCMC

The Second Ho Chi Minh City Environmental Sanitation Project consists of the construction of an interceptor that will convey the wastewater collected from the Nhiêu Lộc-Thị Nghè Canal and District 2 areas of Ho Chi Minh City to a treatment plant.

Dextra ha participado en la construcción del gran sistema subterráneo suministrando 40 Soft-Eyes para ayudar en los avances del túnel.

The cuttable Glass Fiber Reinforced Polymer (PFV) Soft-Eyes were applied to reinforce 21 shafts, allowing penetration by the Tunnel Boring Machine (TBM) without the need to remove steel Refuerzo and without the risk of damaging the TBM’s head.

With its completion planned for 2022, wastewater services in HCMC will become considerably more sustainable and will be remembered as the first major step toward alleviating the environmental and sanitation issues of the country.

Metro de Doha – Fase 1

Publicado en por Sir Gwi

Metro de Doha – Fase 1

Doha Metro Phase 1 is Qatar’s major infrastructure project consisting of three metro lines with a total length of 164 km. The first phase involves the construction of the Red, Green, and Gold lines and their major stations. It is part of the US$36 billion Doha Metro Rail Network Project, aiming to reduce the city’s road traffic congestion while facilitating the connection between Qatar and other Gulf countries.

The required completion period for this project is extremely short, with excavation starting in mid-2013 and operations expected by 2019. Given the project’s constrained timeline, highly innovative solutions are required to complete the building of underground structures in minimal time.

Dextra’s FRP Active Anchors as Temporary Tie-backs in Retaining Walls

Composite materials have been used for over 20 years as temporary reinforcement in concrete structures. In Doha Metro Phase 1, both Dextra’s post-tensioned carbon-FRP (CFRP) Active Anchors and glass-FRP (GFRP) Active Anchors have been used in retaining walls.

When used as temporary tie-backs, CFRP material offers the most advanced technical solution due to its superior tensile strength, creep resistance, and durability, while GFRP Anchors offer a cost-effective solution without technical compromise.

GFRP anchors can advantageously replace steel removable anchors to prevent encroachment on neighboring plots. As a result, GFRP anchors now account for more than 90% of the FRP anchors installed in the region.

For the first phase of the Doha Metro Rail Network project, Dextra has supplied 150 CFRP Active Anchors and 700 GFRP Active Anchors to date.

ASTEC Soft-Eye for Improved TBM Penetration

Dextra’s ASTEC Soft-Eyes is a unique technology using cuttable GFRP reinforcement as a replacement for conventional steel rebars. Since 1996, this solution has become a standard concept in the design of shafts and subway stations.

More than 10 sets of Dextra’s ASTEC Soft-Eyes had been supplied and used in the Doha Metro construction project as of May 2018.

Tren interurbano México – Toluca (Tren Interurbano México – Toluca)

Publicado en por Sir Gwi

Tren interurbano México – Toluca (Tren Interurbano México – Toluca)

o reduce traffic congestion on the Mexico–Toluca highway, as well as to ease connections between both cities, the Secretariat of Communications and Transportation (SCT) is constructing a new 55.7-kilometer rail line in the Mexico City area. Aiming to be an environmentally friendly project, the commuter rail line includes a 4.7-kilometer double-tube tunnel in highly complex terrain and protected natural areas.

The new train will connect Toluca Valley to Mexico City and will provide service to an estimated 270,000 commuters. The line includes six stations: two terminals (Zinacantepec and Observatorio) and four intermediate stations (Cristobal Colon, Metepec, Lerma, and Santa Fe). It will also serve as a backbone for regional and urban transport in the Mexico City area.

Construction began in 2015, and the railway was scheduled for completion in 2019.

Light and Productive Rebar Coupler Solution for the Construction Project

For the reinforcement of the railway’s concrete structures, Dextra supplied more than 100,000 Rolltec splices. The system is a practical and economical alternative to laps. Rolltec is also supported by a single rebar preparation machine, and only one operator is needed to run the machine.

In addition, thanks to the performance of our machines, the thread is prepared in less than 30 seconds!

Moreover, with the Rolltec system, the same type of coupler can be used for both standard and position applications, resulting in optimized project inventory.

For more information about our projects in Latin America, please contact our Panama office.

Metro de El Cairo – Línea 3

Publicado en por Sir Gwi

Metro de El Cairo – Línea 3

Desde que se inauguró el primer tramo de 29 kilómetros de la Línea 1 del Metro en 1987, el proyecto del Metro de El Cairo ha revolucionado el sistema de transporte de la capital.
Actualmente toda la red consta de 3 líneas operativas numeradas del 1 al 3. La línea 3 consta de cuatro fases y el primer tramo entró en funcionamiento en 2012.

Se abrieron tres nuevas estaciones de metro como parte de la cuarta fase de la tercera línea el 15 de junio de 2019, una semana antes del inicio de la Copa Africana de Naciones 2019 (AFCON) en El Cairo.

Dextra ha brindado continuamente soluciones de construcción desde la operación de la Línea 2 en el año 2000, entregando desde entonces más de:

-1.400.000 acopladores de barras de refuerzo

-7.000 tubos sónicos

-60 ojos suaves

Los acopladores de barras de refuerzo Bartec se utilizan para reforzar las estructuras de túneles y estaciones en líneas de metro subterráneas y elevadas como una forma de reducir la congestión del acero y mejorar la conexión por tracción.

Además, la prueba de integridad de los cimientos del metro utilizando el método de prueba Cross Sonic Logging (CSL) se vio facilitada por el uso de tubos sónicos SONITEC, diseñados para un fácil montaje e instalación en jaulas de refuerzo.

Los ojos blandos ASTEC de Dextra están hechos de barras de refuerzo de GFRP para reforzar las paredes D en túneles subterráneos, que pueden cortarse fácilmente con una tuneladora (TBM), lo que resulta en un ahorro de tiempo y dinero.

El proyecto aún está en curso y se espera que la cuarta línea del Metro de El Cairo entre en funcionamiento en 2020.

Metro de Nagpur, estación de metro Zero Mile

Publicado en por Sir Gwi

Metro de Nagpur, estación de metro Zero Mile

Estación Zero Mile del Metro de Nagpur en un proyecto de transporte/estacionamiento/comercial de uso mixto que se lleva a cabo en la ciudad de Nagpur, estado de Maharashtra. Está ubicado en la nueva línea de metro que cruza la ciudad de Norte a Sur. La Zero Mile Station es una estación de metro combinada con un edificio de 12 plantas que albergará zonas comerciales y un aparcamiento con capacidad para 430 vehículos.

Para ese proyecto, Dextra participó en 2017 en el suministro e instalación de anclajes para la estabilización del terreno alrededor del área de excavación.

Dextra suministró su innovadora solución de anclajes activos ASTEC (FRP) (aaa), un tipo especial de anclaje al suelo que, en el caso de aplicaciones temporales, se puede dejar en el suelo una vez finalizado el proyecto, incluso si se extiende más allá del límite de la propiedad o se encuentra con túneles futuros.

De hecho, uno de los principales beneficios de la barra de anclaje de FRP es que hace que el anclaje sea totalmente cortable con equipos de excavación convencionales, lo que la convierte en el mejor sustituto de los anclajes removibles convencionales, que son anclajes de acero que deben retirarse del suelo mediante fuerza bruta al final. del proyecto.

Los anclajes activos Dextra ASTEC son livianos de transportar y los trabajadores pueden transportarlos hasta su ubicación final. Una vez insertado en el orificio perforado, cada anclaje se inyecta y luego se tensa mediante el uso de cordones de PT convencionales conectados al anclaje de FRP. Después de la instalación, el anclaje puede permanecer en el suelo, a diferencia de los anclajes removibles convencionales que requieren una gestión adicional del proyecto y generan costos de remoción del anclaje al final de su vida útil.

Para obtener más información sobre las soluciones de anclaje Dextra en India, comuníquese con nuestro oficina de bombay.

Metro de la ciudad de Ho Chi Minh - Línea 1 (Metro HCMC, Vietnam)

Publicado en por Sir Gwi

Metro de la ciudad de Ho Chi Minh - Línea 1 (Metro HCMC, Vietnam)

Ho Chi Minh City Metro – Line 1 is the first part of the megacity’s 109-kilometer rail line project undertaken by the Management Authority for Urban Railways (MAUR).

Cuando se logre, el sistema de transporte público cubrirá las áreas de HCMC con 6 líneas de metro, lo que permitirá a los habitantes y turistas viajar fácil y cómodamente por la ciudad, lo que dará como resultado una mejor calidad de vida urbana.

La primera fase del proyecto consiste en la construcción de una línea ferroviaria de 19,7 kilómetros que conectará el mercado Ben Thanh y el parque Suoi Tien. También incluye la construcción de 17,1 kilómetros de vía elevada con 11 estaciones y 2,6 kilómetros de línea subterránea con 3 estaciones.

For the construction of Vietnam’s biggest city, Dextra has been supplying both concrete reinforcement y bar system solutions.
To reduce steel congestion in heavily reinforced areas, the contractor Shimizu-Maeda Joint Operation opted for Dextra’s end anchors. Anclajes finales is a simple alternative to rebar hooks.

La instalación se realiza únicamente atornillando la placa de anclaje compacta al extremo de la barra de refuerzo. En última instancia, la solución facilita el proceso, lo que se traduce en una mejor calidad del hormigonado.