Hatta Pumped Storage Hydro Power Plant

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

Hatta Pumped Storage Hydro Power Plant

The Hatta Pumped Storage Hydro Power Plant project is located near the community of Hatta in the Hajar Mountains, 140 km southeast of the city of Dubai.

The plant will use water stored in an upper reservoir at the Hatta Dam, utilizing pumped storage technology with solar-powered pumps at the Mohammed bin Rashid Al Maktoum Solar Park.

The project was awarded to a consortium, including STRABAG Dubai LLC and STRABAG AG, Austria’s Andritz Hydro, and Ozkar, an Oman-based construction company. France’s EDF is consulting on the project.

It will comprise a turbine shaft with a diameter of approximately 36m and a depth of almost 70m, for the placement of two turbines with a total expected power output of 250MW. In addition, a 1.2km long pressure tunnel and two road tunnels with a length of approximately 470m and 440m are to be excavated.

Dextra was involved in the excavation of the hydro tunnels by supplying thousands of GEOTEC™ steel bolts, including Self-Drilling Rock-Bolt, soil nails and combination bolts, diameter 22 to 32mm, for rock mass and slope stabilization.

Dextra GEOTEC™ steel bolt systems are available for every ground condition in various applications such as roadways, hydro power and underground oil/gas storage, sub-sea, and sewer tunnels.

The project is scheduled to be commissioned in early 2024.

It is part of the Dubai Clean Energy Strategy 2050 program, which has a goal of providing 75% of Dubai’s total power generation from clean energy sources by 2050.

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.

Al-Zour LNG Import Terminal

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

Al-Zour LNG Import Terminal

The Al-Zour LNG Import Terminal is the world’s largest liquefied natural gas (LNG) import terminal, located 90 kilometers southeast of Kuwait’s capital. The project included the construction of a re-gasification facility, eight LNG storage tanks with a capacity of 225,000m³ each, marine facilities including two marine jetties, and berthing facilities for loading, and other components such as 14 HP pumps, boil-off gas (BOG) and flare facilities.

The facility was expected to produce approximately 22 million metric tonnes (MMT) of natural gas a year and would have a storage capacity of 1.8 million m³ of LNG. The liquefaction capacity of the terminal would be 30 billion cubic metres a day (bcm/d).

Dextra supplied 202 tons of grade 700 marine tie bars and 166 tons of wailing beams for the construction of marine facilities of this project. Tie bars were used as anchors between sheet piles or concrete walls.

The import terminal was completed in November 2021 and it reached full operations in February 2022. The LNG terminal is providing the Middle East country with a stable gas network in the long run, allowing it to respond to the rising call for energy diversification and sustainable energy.

Image credit: Hyundai Engineering Co.

Brasília Mané Garrincha Stadium

Posted on November 4, 2022March 16, 2024 by Sir Gwi

Brasília Mané Garrincha Stadium

The Brasilia Stadium, also called Estádio Nacional Mané Garrincha or National Stadium of Brasilia, is a football and multipurpose arena which was rebuilt between 2010 and 2013 in preparation of the 2014 FIFA Worldcup in Brazil.

The 2013 version of the stadium can sit up to 72,000 people, making it the second largest stadium in Brasil in capacity.

For this project, Dextra Do Brasil delivered to contractor Grupovia & Andrade Gutierrez its Rolltec rebar coupler solution as well as Rolltec Headed Bars.

Rolltec is the most popular rebar slicing solution in Brazil, providing a competitive alternative to lap splices and more importantly allowing advanced applications simplifying project management and operations.

For the called Estádio Nacional Mané Garrincha, rebar couplers were used as a way to connect rebar cages which have been previously prefabricated on the ground.

Rolltec allow a swift rebar cage reconnection by simply pulling the coupler by hand from the top cage to the bottom cage. In total, more than 57,000 Rolltec couplers were used the columns of the stadium.

6,000 Rolltec Headed Bars were also used on this project as a replacement to hook bars in congested parts of the reinforcement. Rolltec Headed Bars use the same standard thread profile as coupler, simplifying rebar production.

The Rollltec solution was supported by a Rolltec machine installed at the stadium construction site. The commissioning and maintenance of the machine was done by Dextra do Brasil local engineers, ensuring the training of operators and guaranteeing high productivity of the equipment.

Santo Antônio Hydroelectric

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

Santo Antônio Hydroelectric

Santo Antônio Dam is a hydroelectric dam set up on the Mareira River, in the state of Rondônia, Brazil. The dam is powered by 50 turbines for a total capacity of 3,580 MW.

For this major dam project, Dextra Do Brasil delivered to contractors Odebrecht & Andrade Gutierrezits its Rolltec rebar coupler solution.

Rolltec is the most popular rebar slicing solution in Brazil, providing a competitive alternative to lap splices. The rebar preparation is supported by a unique light equipment, operated by a single operator. The Rolltec machine is relatively easy to transport and convenient to install even on most remote locations such as dam construction sites.

On the Santo Antonio dam, rebar coupler were used to reconnect bent rebar. To do so, a straight bar is previously threaded (A/B/C thread length). The bar is then bent according to project requirements.

If needed, to protect the thread coupler can be temporarily set up onto the rebar as well.

Please consult us for more technical information about coupler applications on bent bars.

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.

Perth City Link

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

Perth City Link

The Perth City Link is an transport and urban development project taking plate in Perth, Western Australia. It aims to reclaims more than 13.5 hectares of land previously used by connecting railways by sinking a train lane, hence making land available at the surface to reconnect two parts of the city with streets, commercial and residential buildings.

For this project, Dextra has been involved between 2012 and 2014 in the early foundation works:

Supply of Dextra Rolltec mechanical rebar splicing solution, used for the vertical connection of rebar in D-Walls and Micropiles. Rebar couplers were used to reconnect cages which had been previously prefabricated by our rebar partner fabricator in Perth.
Dextra also supplied its Sonitec sonic tubes used the Cross Sonic Logging (CSL) integrity testing of the foundations piles.

For more information about foundations solutions available in Australia, please consult our Bangkok office

Maitree Super Thermal Power Project

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

Maitree Super Thermal Power Project

Maitree Super Thermal Power Project is a 2×660 MW coal-fired power station project being developed by the Bangladesh-India Friendship Power Company (BIFPCL), a 50-50 joint project of the governments of Bangladesh and India. The power station will be located in Rampal, Bangladesh.

For this project, Dextra has supplied more than 400 assemblies of grade 700 Marine Tie Bar systems to connect piles and waling beams for a 1.2km long jetty of the coal power plant.

Dextra’s Marine Tie Bar systems consist of steel bars and anchorage accessories that act as an anchorage to tie back sea walls to anchor walls.

Bars are available in three carbon steel grades, up to a yield stress of 700Mpa and can be chosen among a selection of 24 bar diameters, up to M162, allowing a perfect match to the performance requirements.

In addition, standard range of anchorage components allow easy installation and connection to all kinds of marine walls.

The construction of the Maitree Super Thermal Power started in 2017 and is planned to be finalized by 2022.

Bakheng Water Treatment Plant

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

Bakheng Water Treatment Plant

The Bakheng Water Treatment Plant is located in the Bakheng district of Phnom Penh, Cambodia. The plant will be built to improve the water supply in this area and eventually give a 60 percent increase in drinking water delivery capacity due to substantial urban expansion.

A drinking water treatment plant and transfer pipelines are part of the project. The supply system will eventually provide drinking water to more than 1.5 million residents in Phnom Penh’s north-east.

By the end of Phase 1, the plant should be operational to provide drinking water to the more than 750,000 inhabitants of the area. By the end of Phase 2, its capacity will be doubled.

The project includes earthworks and soil treatment, civil engineering design of the structures, equipment installation, power supply to the equipment, and system automation.

Dextra supplied Glass Fiber Reinforced Polymer (GFRP) rebars which were installed in bored piles instead of reinforcement of traditional steel rebars to facilitate the TMB breakthrough in the underground waterway tunnel.

Category: Projects