Heathrow Airport Terminal 5

Posted on November 4, 2022March 15, 2024 by Sir Gwi

Heathrow Airport Terminal 5

Heathrow Airport is the busiest international airport in the United Kingdom, located around 25km west of central London.

Dextra has been involved in the construction of Terminal 5 and associated structures.

For Heathrow Airport, Dextra delivered its most advanced rebar splicing solution: Griptec, which is distributed in the United Kingdom by local expert fabricators.

As a result of its high performance, inherent reliability, systematic proof loading of every connection in factory conditions and comprehensive certification, Griptec is specified by major consultants globally. In the United Kingdom Griptec holds all three of the CARES splicing product certificates. That is TA1-A, TA1-B and TA1-C.

For our distributors, servicing the rebar preparation, the Griptec solution is convenient and productive. It is supported by a smart machine, manned by a single operator, offers highly productive cycle times (around 45 sec per rebar prepared) and includes of a test that systematically proof loads each and every bar / sleeve connection.

On the contractor side, Griptec offered a simple, effective and reliable way to connect rebar in columns, diaphragm wall and slabs. One application at Heathrow was for the roof of the new underground station. Griptec connections were also used to provide temporary openings that allowed men and equipment to freely move through the rebar structure and be easily ‘closed’ using single lengths of rebar with Griptec connections to both ends.

Thanks to its parallel-thread technology, Griptec does not require any torque wrenching at a specific value and can be verified by simple visual inspection, a significant advantage to simplify the project schedule and keep operations as productive as possible.

Dubai Airport

Posted on November 4, 2022March 15, 2024 by Sir Gwi

Dubai Airport

Dubai Airport is the main airport in the United Arab Emirates. The famous airport, located a few kilometer north of Dubai city, is home of the famous Emirates airline. Dubai International Airport is the #1 airport in the world in term of international passengers traffic.

Dextra Middle-East, also located in Dubai, has been involved on numerous packages of Dubai Airport construction, especially around the years 2003 to 2005, for the construction of Terminal 3 and associated concourses.

For Dubai Internal Project, Dextra has supplied its popular
Bartec coupler solution, #1 rebar coupler solution in the UAE. 1.5 million couplers have been used on Dubai International Airport.

Superstructure

Bartec couplers provided a technical solution to allow the reconnection of second phase reinforcement between columns and beams, and between walls and beams.

Rebar couplers were also used to create temporary openings in the reinforcement, allowing passage of man and equipment.

Foundations

Bartec couplers were used for the foundation piles. For that application, the couplers became part of a very integrated and automated cage manufacturing process, allowing to connect together large diameter rebar in a minimum time and maximizing cage production output.

As a complement to the Bartec rebar coupler solution, Dextra Sonitec tubes were used to ensure swift installation and reconnection of the sonic tubes all along the cages length. Sonitec tubes are especially easy to install, thanks to their Push-Fit rubber mouth, and easy to set up in the cage thanks to their welded heads. More than 1,800,000 meters of Sonitec tubes have been installed on Dubai International Airport over the years!

Bangkok BTS

Posted on November 4, 2022March 15, 2024 by Sir Gwi

Bangkok BTS

The Bangkok mass Transit System (BTS) is a large urban skytrain system located across Bangkok, the capital city of Thailand. The system was inaugurated in 1999.

As of 2017, the system consists of 24 elevated stations and 37 km of elevated rail organized in two main lines crossing each other in Siam central station.

The BTS system is undergoing an extension of its two main lines with line segments and stations expected to enter in operations in 2019 and 2020.

Foundations

For various packages over the years, Dextra has supplied Sonitec tubes, which are used to test the concrete pile foundations below stations and rail.

In total, Dextra supplied approximately 40,000 linear meters of Sonitec tubes, a distance actually equivalent ot the BTS system length itself.

Pylons

For pylon vertical bar connections, Dextra offered its
Bartec connection.
Bartec allows to conveniently splice prefabricated rebar cages by the use of a simple rebar coupler, allowing savings in steel compared to overlap and accelerating site operations.

In Thailand the threading operation is supported from Dextra’s factory, conveniently located in the North East of Bankgok. Contractors receive the rebar already prepared and mounted with their rebar coupler.

Mumbai ChhatrapatiShivaji Airport

Posted on November 4, 2022March 14, 2024 by Sir Gwi

Mumbai ChhatrapatiShivaji Airport

Mumbai ChhatrapatiShivaji International Airport is the primary airport serving international airports to Mumbai. It is the second airport in India in term of passenger traffic.

Dextra has been involved in the construction of Terminal 2 and associated structures, which took place between 2009 and 2013.

For Mumbai Airport, Dextradelivered its popular
Bartec rebar coupler solution, which is the main rebar coupler solution used on large projects in India.

Dextra operates in Mumbai its own threading yard and took in charge therebar preparation for this project.

On the construction site,
Bartec was used extensively for vertical connections (bar-to-bar vertical column connections), as well as horizontal applications (column-to-beam), typically on reinforcement ⌀32mm. Bartec offers a very high level of performance, guaranteeing “bar break” performance on the rebar used on Mumbai Airport.

For the contractor(Larsten& Toubro on this project),
Bartec offers a simple and cost effective way of connecting rebar.

Thanks to its parallel thread technology and rebar prepared with various thread length, it requires the very same coupler for standard applications (when one bar can be rotated inside coupler) and positional applications (when no bar can be rotated). A neat feature simplifying stock keeping and preventing product mismatch at site.

Madrid Chamartín Clara Campoamor Railway Station Expansion

Posted on November 4, 2022March 15, 2024 by Sir Gwi

Madrid Chamartín Clara Campoamor Railway Station Expansion

Madrid Chamartín Clara Campoamor Railway Station Expansion is one of the largest infrastructure projects in Spain. The expansion project aimed to increase the capacity of the railway station and improve the overall passenger experience. Dextra supplied 60,000 linear meters of Sonitec, a crosshole sonic logging testing tube, for the piling work of the project.

The Madrid Chamartín Clara Campoamor Railway Station is one of the busiest railway stations in Spain, serving more than 60 million passengers each year. The expansion project was necessary to meet the growing demand for train services in the city. The project involved the construction of new platforms, tracks, and passenger facilities.

Dextra, a leading supplier of construction solutions, was chosen to supply the Sonitec crosshole sonic logging testing tube for the piling work of the project. The Sonitec tube is a highly advanced system that enables precise and accurate measurements of pile integrity. The system uses crosshole sonic logging technology to assess the condition of the piles, ensuring that they are strong enough to support the weight of the railway station.

The use of the Sonitec crosshole sonic logging testing tube allowed the construction team to carry out the piling work with confidence and ensured the structural integrity of the piles. The system provided real-time data on the pile condition, enabling the construction team to make informed decisions and make any necessary adjustments during the construction process.

Banner image credit: UNStudio, b720 Arquitectura and Esteyco

Hong Kong International Airport Terminal 2

Posted on November 4, 2022March 15, 2024 by Sir Gwi

Hong Kong International Airport Terminal 2

Hong Kong International Airport (HKIA) stands as a global aviation hub, ranking among the world’s busiest airports for both cargo and passenger traffic. As part of its commitment to excellence and efficiency, the recent Terminal 2 Expansion project aimed to enhance the airport’s capacity and infrastructure. In this ambitious endeavor, Dextra’s contribution played a pivotal role in ensuring the project’s success.

With the continuous growth in air travel and cargo shipments, HKIA recognized the need to expand and upgrade its facilities to accommodate increasing demand. Terminal 2, a vital component of the airport’s infrastructure, became the focus of an extensive expansion project. This redevelopment aimed not only to increase passenger capacity but also to enhance operational efficiency and provide a seamless experience for travelers.

Dextra, a leading provider of engineered construction products, played a crucial role in the success of the Terminal 2 Expansion project. The company supplied an impressive 200 tons of post-tensioning bars, specifically the size M78 and M88, Grade 1080. These post-tensioning bars were instrumental in several key aspects of the construction process.

Connection of Jacking Towers:

The expansion project involved intricate engineering, requiring the precise connection of jacking towers to ensure the structural integrity of the new terminal. Dextra’s post-tensioning bars provided the necessary reinforcement, allowing for a secure and reliable connection between the towers.

Heavy Lifting of Roof Structure:

Terminal 2’s redevelopment included the installation of a robust and aesthetically pleasing roof structure. The weight and complexity of the roof necessitated a sophisticated lifting mechanism. Dextra’s Grade 1080 post-tensioning bars facilitated the heavy lifting process, ensuring that the roof structure was securely and efficiently positioned.

As HKIA continues to uphold its status as a global aviation leader, the Terminal 2 Expansion project and Dextra’s significant contribution stand out as a remarkable example of innovation and excellence in airport infrastructure development.

Melbourne Metro

Posted on November 4, 2022March 14, 2024 by Sir Gwi

Melbourne Metro: five new underground stations

The Melbourne city’s metropolitan rail service operates 226 six-carriage trains across 998 km of tracks. The Metro has 15 lines and 222 stations, serving more than 400,000 passengers a day across the city.

In 2017, the construction of a 9 km long tunnel and five new underground stations were announced for greater capacity and additional coverage of the suburban area of the city.

The construction started in 2018. Dextra was involved in the project by supplying rebar connectors with fully automated rebar preparation equipment for the stations’ structure reinforcement works.

Griptec couplers were chosen thanks to the unrivaled performance in tension, compression and fatigue, and 400,000 units have been delivered.

Moreover, Dextra also supplied:

5,300 GFRP Astec Combination Bolts. It is used at the CBD cavern location. The 19m width of the cavern allowed for the construction of two conventional 7m tunnels, built in parallel with the middle segments secured by GFRP CB Bolts, that can be cut to make the gallery wider.

2,400 GFRP Geotec GR45 – 25mm dowels of 11.8 meters long were used to secure the face during the excavation.

900 GFRP Astec soil nails ST50 – 41 were applied to secure several stations under construction. Some of them are outside of the boundary of the project since the GFRP can remain on the ground outside of their property and can easily be cut later.

16 soft eyes were used in d-wall and bored pile of five stations.

Dextra was able to support and share their expertise on GFRP at design stage and produce the GFRP shaped solutions as per the owner expectation. Thanks to the cuttability of the GFRP, the TBM can pass through the d-wall in a limited time without any damages.

The Metro tunnel and its new stations are due to open in 2025 and predicted to be a new landmark of the city.

(photo credit: Hugh Llewelyn at https://bit.ly/2S0kbAG)

Abu Dhabi International Airport

Posted on November 4, 2022May 8, 2024 by Sir Gwi

Abu Dhabi International Airport

Abu Dhabi Airport is the main airport of Abu Dhabi, capital of the United Arab Emirates and located around 15km east of the city. Abu Dhabi is the second busiest airport in the UAE, after Dubai International.

Dextra has been involved in the construction of the new Midfield Terminal (Terminal 3), which will enter in service end of 2017, significantly boosting the airport capacity and allowing offering new gates for large airliners like the A380.

Dextra has been involved in several parts of the new terminal: foundation, concrete structures, roof and façade.

Foundations& Concrete structures

For the foundation piles,
Bartec couplers have been used for the reconnection of prefabricated cages making the foundation piles, as well as other concrete applications. A solution complemented by the use of
Sonitec sonic logging tubes. The tubes, used for Crosshole Sonic Logging integrity testing, are delivered by segments which can be easily reconnected by hand thanks to their bell mouth, saving time upon installation. A total of 650,000 Bartec couplers and more than 110,0000 Sonitec tubes have been installed on Abu Dhabi Midfield Terminal.

Roofing and Façade

For the roofing structure, Dextra engineering team supported to provide two customized structural solutions.

For all applications requiring structural members to work in compression, Dextra supplied its Compression Strut solution. Compression Strut are simple to install thanks to their fork end, and conveniently allow for minor length adjustments at each fork. A total of 529 Compression Struts have been installed on this project.

For trusses where the effort is in tension, Dextra supplied its Tension Bar Systems. Similarly to compression struts, Tension Bars can be installed easily thanks to fork ends, provide adjustment capability at forks and in-line turnbuckles. Dextra Stainless range has been chosen for this application, guaranteeing unmatched aesthetics thanks to its mirror surface finish.

Delhi Metro Phase 3

Posted on November 4, 2022March 15, 2024 by Sir Gwi

Delhi Metro Phase 3

The Delhi Metro is the largest and busiest rapid transit system in India, serving Delhi and its satellite cities of Ghaziabad, Faridabad, Gurgaon, Noida, Bahadurgarh and Ballabhgarh. It operates over 2,700 trips daily.

The system currently consists of 10 color-coded lines passing 253 stations with a total length of 348 km, including a mix of underground, at-grade, and elevated stations.

The development of the network was divided into phases. Phase 1 and Phase 2 were completed by 2006 and 2011, respectively. Phase 3 has 35 underground stations and 3 new lines, totaling 167 km, and is scheduled to be mostly completed by the end of 2020.

The total length of the underground corridors in Phase 3 is 54 km, more than 20 km longer than the total underground sections in Phases 1 and 2 combined, making it one of the most challenging construction phases.

More than 20 tunnel boring machines were used simultaneously to expedite the tunnel work through 10 Dextra soft-eyes installed in diaphragm walls. Thanks to the cuttable nature of GFRP (glass fiber reinforced polymer) bars, TBMs can get in or out of shafts/stations in few minutes.

Furthermore, 450 sets of active anchors were applied to retain walls during the excavation work. The anchors are also made of GFRP, hence the tendons can be excavated by any standard equipment, and no anchor removal is required.

Moreover, around 2.3 million Bartec couplers were installed to connect rebars in various parts of the concrete structures of the stations. Bartec is a bar-break performance system, designed to withstand an ultimate tensile performance of up to 800 MPa.

2,800 sets of Shear Key post-tensioning systems were also inserted into the concrete reservation as a permanent seismic restrainer for the connection of the elevated metro segments.

King Abdulaziz International Airport (KAIA)

Posted on November 4, 2022March 15, 2024 by Sir Gwi

King Abdulaziz International Airport (KAIA)

The King Abdulaziz International Airport (KAIA) is an international airport located in Jeddah, Saudi Arabia.

The airport, named after the founder of Saudi Arabia, King Abdulaziz Al Saud, is the country’s third largest and the busiest airport.

It has four operational passenger terminals: the North Terminal, South Terminal, the Hajj Terminal, and Terminal 1. The Hajj Terminal was created specifically for Muslim pilgrims who travel to Mecca every year for the Hajj.

Dextra supplied more than 300,000 Bartec couplers which were installed in bridge and exchange, tunnel, railway station, terminal, ATC tower, and car parking structures.

Category: Transport