Doha Metro Phase 1 is Qatar’s mega infrastructure project of three metro lines with a total length of 164 km. The first phase involves the construction of red, green and gold lines and their major stations. It is a part of a US$36,000 million 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 of this project is extremely short: with excavation starting in mid-2013 and operations expected by 2019. With the timeline of the project being constrained, high innovative solutions are required to complete the building of underground structures in a minimal amount of 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-tensions 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 is offering the most advanced technical solution thanks to its superior properties in tensile, creep and durability, while the GFRP Anchors offers a cost-effective solution without technical compromise.

GFRP anchors can advantageously replace steel removable anchors to prevent encroachment of neighboring plots. This is why nowadays, GFRP anchors 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 been supplying 150 CFRP Active Anchors and 700 GFRP Active Anchors to date.

ASTEC Soft-Eye for a better penetration of TBMs

Dextra’s ASTEC Soft-Eyes is a unique technology using cut-able GFRP reinforcement as a replacement of 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 have been supplied and used in Doha Metro construction project as per May 2018.

To reduce traffic congestion on Mexico – Toluca highway, as well as to ease connections between both cities, the Secreatariat of Commuciations and Transportaion (SCT) is undergoing the construction of the new Mexico city areas’ 55.7-kilometer rail line. Aiming to be an environment-friendly project, the commuter rail line includes 4.7-kilometer double-tube tunnel in highly complex terrain and natural protected areas.

The new train will connect Toluca Valley to Mexico City, and will provide a service to an estimated 270,000 commuters. The line included 6 stations: 2 terminals (Zinacantepec and Observatorio) and 4 intermediate (Cristobal Colon, Metepec, Lerma, and Santa Fe). It will also be a backbone for Mexico City area’s regional and urban transport.

The construction being initiated in 2015, the railway is scheduled for completion in 2019.

Light and productive rebar coupler solution for the construction project

For the reinforcement of the railways concrete structures, Dextra supplied more than 100,000 Rolltec splices. The system is a practical and economic alternative to laps. Rolltec is also supported by one rebar preparation equipment, and only one man is needed to operate the machine.

Plus, thanks to the performance of our machines, the thread is ready in less than 30 seconds!
Moreover, with Rolltec system, the same type of coupler can be used for both standard and position applications, resulting in an optimized inventory of the project.

For more information about our projects in Latin America, contact our Panama Office.

Since the first 29km segment of the Metro Line 1 opened in 1987, the Cairo Metro project has revolutionized the transit system in the capital.
Currently the whole network comprises 3 operational lines numbered from 1 to 3. Line 3 consists of four phases, and the first segment started operation in 2012.

Three new metro stations were opened as part of the fourth phase of the third line on June 15, 2019, a week before the kickoff of the 2019 African Cup of Nations (AFCON) in Cairo.

Dextra has continuously provided construction solutions since the operation of Line 2 in 2000, delivering since then more than:

-1,400,000 rebar couplers

-7,000 sonic tubes

-60 soft-eyes

Bartec rebar couplers are used for rebar reinforcement of tunnel and station structures on both underground and elevated metro lines as a way to reduce steel congestion and improve tensile connection.

Moreover, the integrity test of the metro foundations using the Cross Sonic Logging (CSL) testing method was facilitated by the usage of SONITEC sonic tubes, designed for easy assembly and installation in reinforcement cages.

Dextra’s ASTEC soft-eyes are made of GFRP rebar to reinforce D-Walls in underground tunnels, which can easily be cut by Tunnel Boring Machine (TBM), resulting in time and money savings.

The project is still ongoing and the fourth line of the Cairo Metro is expected to start operation in 2020.

胡志明市地铁 1 号线是城市铁路管理局 (MAUR) 承建的这座大城市 109 公里铁路线项目的第一部分。

建成后，公共交通系统将通过6条地铁线路覆盖胡志明市地区，让居民和游客在城市各处轻松便捷地通勤，从而提高城市生活质量。

该项目第一阶段包括建设一条全长19.7公里的铁路线，连接滨城市场和Suoi Tien公园。还包括建设全长17.1公里的高架铁路，设11座车站，以及建设2.6公里的地下铁路，设3座车站。

对于越南最大城市的建设，Dextra 一直提供混凝土钢筋和钢筋系统解决方案。
为了减少加固区域的钢材拥堵，承包商 Shimizu-Maeda Joint Operating 选择了 Dextra 的端锚。有头钢筋是钢筋钩的简单替代品。

只需将紧凑型锚板拧到钢筋末端即可完成安装。该解决方案最终简化了流程，从而提高了混凝土质量。

The Grand Paris Express is currently the largest transport project in development in Europe.

The new 200-km, 68-station automated railway network consists of a ring route around Paris (line 15) and three additional lines (16, 17 and 18) connecting adjacent neighborhoods.

These 4 new lines will circle the capital and link to 3 airports and many business districts. It will transport 2 million commuters a day. The lines are planned to open in stages, with the full completion of the project scheduled for 2030.

The construction of line 15 started in 2015, with its first section between Pont de Sèvres Métro station and Noisy – Champs RER A station.

Dextra was involved at that stage by providing 100,000 Fortec rebar couplers to connect the columns of the stations’ structure.

Additionally, Dextra supplied 15,000 meters of Sonitec sonic tubes to facilitate the structural integrity testing using the CSL (Cross Sonic Logging) method, thus ensuring the homogeneity of concrete within the deep piles and diaphragm walls that are being constructed for the future underground stations.

The first section of line 15 is scheduled to open in 2020.

The Ahmedabad-Gandhinagar Metro Rail Project is a new mass-transit rapid transit system in Gujarat, West India. The project is being implemented by Metro Link Express for Gandhinagar and Ahmedabad (MEGA) and aims to meet the city’s growing population while providing commuters with a better transport system.
The total length of the metro’s first phase is 39.26 km, with 33.26km of elevated section and 6 kilometers underground. The metro will connect suburbs in Ahmedabad along east-west and north-south axis, and the route will also be extended to Gandhinagar in Phase-2.
The construction of the first phase, comprising 32 stations connecting the four corners of the city, has been undergoing since 2015. Being expected to operate in 2020, the first trial run of the metro line is scheduled for January 2019.

Steel sonic logging tubes for concrete integrity tests

For the first phase of the Ahmedabad metro, Dextra is involved in supplying its CSL solution Sonitec for the 6-kilometer long viaduct. Sonitec is Dextra’s sonic logging tube system for Cross-hole sonic logging tests. CSL method allows the contractors to verify the homogeneity of concrete in D-walls, bored piles, drilled shafts, barrettes or in concrete piles. Sonitec helps facilitate the assembly and installation of long tubes in reinforcing cages by its Instant Connection characteristic. Thanks to its large bell-mouth, the tubes can be easily connected seamlessly.

The Red Line is the first section of the new Light Rail system currently in development in Tel Aviv, Israel. The line will run from Bat Yam in the southwest to Petah Tikva in the northeast.

The total projected length of the line is 24km, comprising 34 stations, 10 of which are underground, including an interchange with Israel Railways services.

For this project, Dextra is currently supplying products for the construction of six of the underground stations including Bialik, Abba Hillel, Arlozorov, Shaul HaMelech, Yehudit and Allenby.

More than 200,000 Bartec rebar couplers were supplied for diaphragm walls and for the construction of the station boxes.

Dextra also provided 50,000m of Sonitec ST50 to facilitate the testing of the structural integrity of foundation piles using the CSL (Crosshole Sonic Logging) method.
Sonitec is an easy-to-assemble and time-saving sonic tube solution, preferred among piling and general contractors worldwide for more than 20 years.

The line is currently scheduled for completion in October 2021, making it the second underground service operating in Israel.

The Malaysian SSP Line is the second line of Klang Valley’s MRT System. The main purpose of this project is to provide a better railway infrastructure and transport system in order to serve Malaysia’s growing population.

Commuting through the heart of the Capital

The Malaysian SSP Line will connect Sungai Buloh to Putrajaya, running through the center of Kuala Lumpur and its suburbs. With its 35 stations, among which 11 will be providing connections to other lines, the SSP Line will allow commuters to transfer with ease to and from existing and planned rail lines.
The rail transit system involves the construction of more than 52 km: 13.5km of underground line and a 38.7km of elevated rail. Once operational, it is expected to have a ridership of 529,000 passengers per day.

Rebar couplers for D-wall and slab

For this large metro project, the contractor joint venture MMC-Gamuda has chosen Dextra’s popular rebar reinforcement solution Bartec, supported by 3 sets of bar-end high-productivity equipment. Approximatively 200,000 pieces have been delivered as of April 2018.
Dextra Bartec have been used for productivity reasons. Couplers were embedded in the diaphragm walls surrounding the underground stations, providing horizontal connection points at a later stage of the project. After excavation, couplers are used to connect bars and start the station’s slabs.

For more information about our solutions in Malaysia, please contact Dextra’s Kuala Lumpur office.