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التصنيف: المشاريع

ريو تحت الأرض ونفق لوماس

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ريو تحت الأرض ونفق لوماس

The Río Subterráneo a Lomas tunnel is a 13.5-kilometer-long tunnel in Buenos Aires, Argentina, which will transport drinking water from the newly expanded General Belgrano Water Treatment Plant in the Quilmes area of Bernal to the city of Lomas de Zamora.

As the main element of the Agua Sur system, a water supply project in Argentina, the tunnel is the country’s largest water infrastructure project in the past 40 years. This new system will provide access to freshwater for 2.5 million inhabitants in the southern region of the Buenos Aires metropolitan area.

For this significant project, Dextra supplied Soft-Eyes reinforced with GFRP (Glass Fiber Reinforced Polymer) bars to facilitate Tunnel Boring Machines (TBMs) breaking through a reinforcement cage.

The project required two Tunnel Boring Machines (TBMs) to be launched and received from shafts. The tunnel was excavated at an average depth of 25 meters, starting with a curve of approximately 400 meters in radius and continuing along a largely straight alignment, with a maximum slope of +/- 2 percent.

The first launch shaft is composed of four circular sectors interconnected at the bottom. The shaft measures approximately 45 meters in length, 12 meters in width, and 25 meters in height.

The entire project is expected to take approximately 10 years to complete.

مترو دبي

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مترو دبي

The Dubai Metro is a urban transit rail system operating in Dubai, United Arab Emirates. Two lines are currently operational, the Red Line and Green Line. Additional lines are also planned for coming years.

For the construction of the Red Line, Dextra has been involved between 2005 and 2010 together with the contractors making J T Metro (Obayashi Corporation – Kajima – YapiMerkezi) for the supply of numerous Dextra solutions for various packages and stations.

For the station construction, especially for the foundation works (piles and perimeter d-walls), Dextra supplied its Bartec rebar splicing solutions. Rebar couplers were used for vertical connections in piles D-Walls, columns and piers. Rebar couplers were also used for reconnecting slabs onto the D-Walls. A total of 800,000 Bartec rebar couplers have been supplied for this project, supported by several Bartec equipment sets maintained by local Dextra Aftersales team.

For minor repair applications, RepairGrip couplers were also supplied to splice rebar which had not be prepared with a thread and which had unsufficient produding length to be spliced.

For foundation works as well. Dextra supplied more than 60km of أنابيب سونيتيك الصوتية, used the CSL integrity testing of piles and walls. Sonitec can be easily assembled at site thanks to their push-fit mouth system, boosting teams productivity and avoiding the tedious task of welding tubes together.

Finally, to accelerate tunneling breakthrough phases and minimize TBMs (tunnel boring machines) time when exiting/entering shafts and stations, Dextra engineered the design of GFRP Soft Eyes and supplied more than 400 km of composite rebar for numerous station packages.

مترو كويمبرا بي-بورتاجيم مونديغو

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مترو كويمبرا بي-بورتاجيم مونديغو

The Coimbra B-Portagem Mondego Metro project is part of the public mass transit system of Coimbra, Portugal. Dextra has played a significant role by providing Sonitec tubes for pile testing.

Dextra supplied Sonitec tubes for testing a total of 67 piles ranging in depth from 12 to 19 meters. The tubes were instrumental in conducting these tests with the Cross-Hole Sonic Logging (CSL) methodology.

The innovative push-fit connection system of Sonitec greatly reduced labor time during installation. Thanks to this user-friendly system, the contractor experienced smoother and more efficient pile testing processes. By eliminating the need for additional labor-intensive procedures, the contractor saved valuable time and resources. It also ensures a secure and reliable connection for pile testing.

بنما مترو لينيا 1 ولينيا 2

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بنما مترو لينيا 1 ولينيا 2

The Panama Metro is a recently completed urban transportation system in Panama City, the capital of Panama.

Panama Metro Line 1 began construction in 2010 and started operating in 2014. It is 16 km long, with part of the line underground and part elevated.

Following the success of the first line, a second line has now entered the construction phase and was expected to begin operations by the end of 2018.

Pier Columns

For this large construction project, Dextra was involved between 2011 and 2012 (Line 1) and since 2015 (Line 2) for the structural reinforcement of the large pier columns in the elevated sections of the line.

On both lines, the Bartec coupler solution, popular in Panama, was chosen to vertically reconnect the large prefabricated cages made of #11 rebar.

To perform this application, cages are prefabricated on the ground before being split by unscrewing all the couplers on one side.

Once lifted and positioned on top of each other, with the same bars matching those they previously spliced, the cage reconnection can then be made using standard Bartec couplers.

خط وسط مدينة سنغافورة MRT

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خط وسط مدينة سنغافورة MRT

MRT Downtown Line هو خط مترو أنفاق تحت الأرض بطول 44 كيلومترًا يربط بين المناطق الشمالية الغربية والشرقية لجزيرة سنغافورة الرئيسية. ومن خلال 36 محطة، ينبغي أن ينقل في نهاية المطاف أكثر من نصف مليون مسافر يوميًا.

تم بناء الخط على شكل قطاعات. أجزاء من الخط تعمل بالفعل. ومن المخطط الانتهاء الكامل بحلول عام 2024.

شاركت Dextra منذ عام 2008 و2011 في تصميم وهندسة وتوريد FRP Soft Eyes الكبيرة لحزم المحطات المتعددة لمختلف المقاولين المعنيين.

تم تصميم وإنتاج ما مجموعه 19 Soft-Eyes (2) بواسطة Dextra لخط DTL. تُعد Soft-Eyes جزءًا من جدران D للمحطة ويتم وضعها عند مدخل/مخرج المحطة في كل محطة.

تم تصميم وإنتاج ما مجموعه 19 Soft-Eyes (2) بواسطة Dextra لخط DTL. تُعد Soft-Eyes جزءًا من جدران D للمحطة ويتم وضعها عند مدخل/مخرج المحطة في كل محطة.

قبل إنشاء D-Wall، قامت Dextra بتصميم قفص FRP مع الأخذ في الاعتبار حجم آلة TBM وهامش الخطأ وقوى التربة والمزيد من معلمات التصميم.

بفضل خصائص مادة FRP، تقوم ماكينات حفر الأنفاق بقطع الجدار D في أقل وقت ممكن، مما يوفر الوقت في الموعد المحدد ويضمن الحالة المثالية لرأس ماكينة TBM.

استكمالًا لـ Soft Eyes، قامت Dextra أيضًا بتزويد محطات مترو الأنفاق المختلفة بقارنات حديد التسليح من Bartec.

في الجدران D، يتم استخدام قارنة حديد التسليح (2) في الغالب كوسيلة لإجراء توصيل حديد التسليح في المرحلة الثانية. بمجرد الانتهاء من أعمال الحفر، يتم استخدام قارنات التوصيل لتوصيل شريط البداية بالجدار D من أجل بناء الألواح.

(1) تقوية العين الناعمة FRP في الجدار D قبل خفض القفص.

(2) قارنات حديد التسليح المعلقة لتوصيل بلاطة المحطة.

لندن كروسريل

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لندن كروسريل

London Crossrail (given the name Elizabeth line in 2016) is the largest engineering project in Europe. It is a major part of Transport for London’s investment programme and the largest addition to the transport system in 50 years.

The project consists of a 118-km east-west rail link across Greater London, running from Reading and Heathrow in the west to Shenfield and Abbey Wood in the east.

Since 2009, Dextra has delivered more than 600,000 Griptec connections on more than 20 packages, including stations such as:

  • Liverpool Street,
  • Paddington,
  • Bond Street,
  • Canary Wharf,
  • Royal Oak Portal,
  • Pudding Mill Lane.

Griptec couplers have been used on D-Walls (vertical and horizontal connections), columns, and piles (vertical connections).

Segments of Crossrail were expected to start operating progressively, with full completion scheduled for December 2019.

مترو تشيناي

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مترو تشيناي

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.

خط مترو ريو 4

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خط مترو ريو 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.

مترو ناجبور، الوصول إلى 1 (الخط 1)

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مترو ناجبور، الوصول إلى 1 (الخط 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.

حل

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.

مترو الدوحة، الخط الذهبي – محطة السد الدائري الثالث

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مترو الدوحة، الخط الذهبي – محطة السد الدائري الثالث

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.