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Categoria: Transporte

Metrô de Chennai

Postado em por Sir Gwi

Metrô 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.

Linha 4 do Metrô do Rio

Postado em por Sir Gwi

Linha 4 do Metrô do Rio

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.

Metrô de Nagpur, Reach-1 (Linha 1)

Postado em por Sir Gwi

Metrô de Nagpur, Reach-1 (Linha 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.

Solução

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.

Metrô de Doha, Linha Ouro – Estação Al Sadd C-Ring

Postado em por Sir Gwi

Metrô de Doha, Linha Ouro – Estação 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.

2º HCMC Saneamento Ambiental

Postado em por Sir Gwi

2º HCMC Saneamento Ambiental

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.

A Dextra esteve envolvida na construção do grande sistema subterrâneo, fornecendo 40 Soft-Eyes para auxiliar na abertura do túnel.

The cuttable Glass Fiber Reinforced Polymer (PRFV) Soft-Eyes were applied to reinforce 21 shafts, allowing penetration by the Tunnel Boring Machine (TBM) without the need to remove steel reinforcement 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.

Metrô de Doha – Fase 1

Postado em por Sir Gwi

Metrô 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.

Trem Interurbano México – Toluca (Tren Interurbano México – Toluca)

Postado em por Sir Gwi

Trem 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.

Metrô do Cairo – Linha 3

Postado em por Sir Gwi

Metrô do Cairo – Linha 3

Desde que o primeiro segmento de 29 km da Linha 1 do Metrô foi inaugurado em 1987, o projeto do Metrô do Cairo revolucionou o sistema de trânsito na capital.
Atualmente toda a rede é composta por 3 linhas operacionais numeradas de 1 a 3. A linha 3 é composta por quatro fases, sendo que o primeiro segmento entrou em operação em 2012.

Três novas estações de metrô foram inauguradas como parte da quarta fase da terceira linha em 15 de junho de 2019, uma semana antes do início da Copa das Nações Africanas de 2019 (AFCON), no Cairo.

A Dextra tem fornecido continuamente soluções de construção desde a operação da Linha 2 em 2000, entregando desde então mais de:

-1.400.000 acopladores de vergalhão

-7.000 tubos sônicos

-60 olhos suaves

Os acopladores de vergalhão Bartec são usados para reforço de vergalhões em estruturas de túneis e estações em linhas subterrâneas e elevadas de metrô, como forma de reduzir o congestionamento de aço e melhorar a conexão de tração.

Além disso, o teste de integridade das fundações do metrô usando o método de teste Cross Sonic Logging (CSL) foi facilitado pelo uso de tubos sônicos SONITEC, projetados para fácil montagem e instalação em gaiolas de reforço.

Os soft-eyes ASTEC da Dextra são feitos de vergalhões GFRP para reforçar paredes D em túneis subterrâneos, que podem ser facilmente cortados pela máquina de perfuração de túneis (TBM), resultando em economia de tempo e dinheiro.

O projeto ainda está em andamento e a quarta linha do Metrô do Cairo deverá entrar em operação em 2020.

Metrô de Nagpur, estação de metrô Zero Mile

Postado em por Sir Gwi

Metrô de Nagpur, estação de metrô Zero Mile

Estação Nagpur Metro Zero Mile em um projeto de uso misto de transporte/estacionamento/comercial que ocorre na cidade de Nagpur, estado de Maharashtra. Está localizado na nova linha de metrô que atravessa a cidade de Norte a Sul. A Estação Zero Mile é uma estação de metrô agregada a um prédio de 12 andares que abrigará áreas comerciais e estacionamento com capacidade para 430 veículos.

Para esse projeto, a Dextra esteve envolvida em 2017 no fornecimento e instalação de âncoras de solo para estabilização do terreno em torno da área de escavação.

A Dextra forneceu sua inovadora solução ASTEC (FRP) Active Anchors (AAA), um tipo especial de âncoras de solo que, no caso de aplicações temporárias, podem ser deixadas no solo após o término do projeto, mesmo que ultrapassem os limites da propriedade ou cruzem com futuros túneis.

Na verdade, um dos principais benefícios da barra de ancoragem FRP é tornar a âncora totalmente cortável por equipamento de escavação convencional, tornando-a o melhor substituto para as âncoras removíveis convencionais, que são âncoras de aço que precisam ser removidas do solo por força bruta no final. de projeto.

As âncoras ativas Dextra ASTEC são leves para transportar e podem ser transportadas até seu local final pelos trabalhadores. Uma vez inserida no furo perfurado, cada âncora é grauteada e posteriormente tensionada pelo uso de cordões PT convencionais conectados à âncora FRP. Após a instalação, a âncora pode permanecer no solo, ao contrário das âncoras removíveis convencionais que requerem gerenciamento de projeto adicional e geram custos de remoção da âncora em fim de vida.

Para obter mais informações sobre as soluções de ancoragem Dextra na Índia, entre em contato com nosso Escritório de Mumbai.

Metrô da cidade de Ho Chi Minh – Linha 1 (Metrô HCMC, Vietnã)

Postado em por Sir Gwi

Metrô da cidade de Ho Chi Minh – Linha 1 (Metrô HCMC, Vietnã)

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).

Quando alcançado, o sistema de transporte coletivo cobrirá as áreas do HCMC com 6 linhas de metrô, permitindo que habitantes e turistas se desloquem de maneira fácil e conveniente pela cidade, resultando em uma melhor qualidade de vida urbana.

A primeira fase do projeto consiste na construção de uma linha ferroviária de 19,7 quilômetros, ligando o Mercado Ben Thanh e o Parque Suoi Tien. Inclui também a construção de uma ferrovia elevada de 17,1 quilômetros com 11 estações e uma linha subterrânea de 2,6 quilômetros com 3 estações.

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

A instalação é feita apenas aparafusando a placa de ancoragem compacta na extremidade da barra de reforço. A solução acaba facilitando o processo, resultando em melhor qualidade de concretagem.