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Kategorie: Transport

Chennai Metro

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Chennai Metro

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.

Rio Metro Linie 4

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Rio Metro Linie 4

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.

U-Bahn Nagpur, Reach-1 (Linie 1)

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U-Bahn Nagpur, Reach-1 (Linie 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.

Lösung

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.

U-Bahn Doha, Gold Line – C-Ring-Station Al Sadd

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U-Bahn Doha, Gold Line – C-Ring-Station Al Sadd

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.

2. HCMC-Umwelthygiene

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2. HCMC-Umwelthygiene

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 war am Bau des großen unterirdischen Systems beteiligt, indem es 40 Soft-Eyes zur Unterstützung bei den Tunneldurchbrüchen lieferte.

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

Doha Metro Rail – Phase 1

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Doha Metro Rail – Phase 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.

Intercity-Zug Mexiko – Toluca (Tren Interurbano México – Toluca)

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Intercity-Zug Mexiko – 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 Kairo – Linie 3

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Metro Kairo – Linie 3

Seit der Eröffnung des ersten 29 km langen Abschnitts der U-Bahn-Linie 1 im Jahr 1987 hat das U-Bahn-Projekt Kairo das Verkehrssystem der Hauptstadt revolutioniert.
Derzeit umfasst das gesamte Netzwerk drei Betriebslinien, die von 1 bis 3 nummeriert sind. Linie 3 besteht aus vier Phasen, und das erste Segment wurde 2012 in Betrieb genommen.

Am 15. Juni 2019, eine Woche vor dem Start des Afrikanischen Nationen-Pokals 2019 (AFCON) in Kairo, wurden im Rahmen der vierten Phase der dritten Linie drei neue U-Bahn-Stationen eröffnet.

Dextra hat seit dem Betrieb der Linie 2 im Jahr 2000 kontinuierlich Baulösungen bereitgestellt und seitdem mehr als Folgendes geliefert:

-1.400.000 Bewehrungskupplungen

-7.000 Schallröhren

-60 weiche Augen

Bartec-Bewehrungskupplungen werden zur Bewehrungsverstärkung von Tunnel- und Bahnhofskonstruktionen sowohl auf U-Bahn- als auch auf Hochbahnstrecken eingesetzt, um den Stahlstau zu reduzieren und die Zugverbindung zu verbessern.

Darüber hinaus wurde die Integritätsprüfung der Metrofundamente mithilfe der Testmethode Cross Sonic Logging (CSL) durch den Einsatz von SONITEC-Schallrohren erleichtert, die für eine einfache Montage und Installation in Bewehrungskörben ausgelegt sind.

Die ASTEC-Soft-Eyes von Dextra bestehen aus GFK-Bewehrungsstäben zur Verstärkung von D-Wänden in unterirdischen Tunneln, die problemlos mit einer Tunnelbohrmaschine (TBM) geschnitten werden können, was zu Zeit- und Geldeinsparungen führt.

Das Projekt ist noch im Gange und die vierte Linie der Kairoer Metro soll 2020 ihren Betrieb aufnehmen.

U-Bahn Nagpur, U-Bahn-Station Zero Mile

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U-Bahn Nagpur, U-Bahn-Station Zero Mile

Nagpur Metro Zero Mile Station in einem gemischt genutzten Transport-, Park- und Gewerbeprojekt in der Stadt Nagpur im Bundesstaat Maharashtra. Es liegt an der neuen U-Bahnlinie, die die Stadt von Norden nach Süden durchquert. Die Zero Mile Station ist eine U-Bahn-Station, die zu einem 12-stöckigen Gebäude zusammengefasst ist und Gewerbeflächen sowie einen Parkplatz mit einer Kapazität von 430 Fahrzeugen beherbergen wird.

Bei diesem Projekt war Dextra im Jahr 2017 an der Lieferung und Installation von Bodenankern zur Stabilisierung des Bodens rund um das Ausgrabungsgebiet beteiligt.

Dextra lieferte seine innovative ASTEC (FRP) Active Anchors-Lösung (AAA), eine spezielle Art von Erdankern, die bei temporären Anwendungen nach Projektende im Boden belassen werden können, auch wenn sie über die Grundstücksgrenze hinausreichen oder auf künftige Tunnel stoßen.

Tatsächlich besteht einer der Hauptvorteile der FRP-Ankerstange darin, dass der Anker mit herkömmlicher Aushubausrüstung vollständig zerschnitten werden kann, was ihn zum besten Ersatz für herkömmliche abnehmbare Anker macht, bei denen es sich um Stahlanker handelt, die am Ende mit roher Gewalt aus dem Boden entfernt werden müssen des Projekts.

Dextra ASTEC Aktivanker sind leicht zu transportieren und können von Arbeitern an ihren endgültigen Standort getragen werden. Nach dem Einsetzen in das Bohrloch wird jeder Anker verpresst und später mithilfe herkömmlicher PT-Litzen, die mit dem FRP-Anker verbunden sind, vorgespannt. Nach der Installation kann der Anker im Boden verbleiben, im Gegensatz zu herkömmlichen abnehmbaren Ankern, die zusätzliches Projektmanagement erfordern und Kosten für die Entfernung des Ankers am Ende seiner Lebensdauer verursachen.

Für weitere Informationen zu Dextra-Verankerungslösungen in Indien wenden Sie sich bitte an unser Büro in Mumbai.

Metro Ho-Chi-Minh-Stadt – Linie 1 (HCMC Metro, Vietnam)

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Metro Ho-Chi-Minh-Stadt – Linie 1 (HCMC Metro, 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).

Sobald das Nahverkehrssystem erreicht ist, wird es die HCMC-Gebiete mit sechs U-Bahn-Linien abdecken, sodass Einwohner und Touristen einfach und bequem durch die Stadt pendeln können, was zu einer besseren städtischen Lebensqualität führt.

Die erste Phase des Projekts besteht im Bau einer 19,7 Kilometer langen Eisenbahnlinie, die den Ben-Thanh-Markt und den Suoi-Tien-Park verbindet. Dazu gehört auch der Bau einer 17,1 Kilometer langen Hochbahn mit 11 Stationen und einer 2,6 Kilometer langen U-Bahn-Linie mit 3 Stationen.

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

Die Montage erfolgt durch ledigliches Aufschrauben der Kompaktankerplatte auf das Ende des Bewehrungsstabes. Letztendlich erleichtert die Lösung den Prozess und führt zu einer besseren Betonierqualität.