Ellaktor subsidiary Aktor, which has a 32 percent stake in the Alysj joint venture, has signed the contract for the project, which is expected to take 54 months to complete, an Ellaktor statement said. The Gold Line is by far the largest single construction package of the Doha Metro. It traverses Doha from East to West.
The Gold Line will connect the airport’s northern part with Souq Waqif, Msheireb, Bin Mahmoud, Al Sadd and Al Waab.
The project includes 32-km of bore tunnelling with a diameter of six metres, tunnelling lined with approximately 128,000 segments, six tunnel boring machines (TBMs) utilised simultaneously, 13 underground stations fitted out with high-end finishes and state of the art mechanical, engineering and plumbing (MEP) systems, 2.5 million cubic metres of excavations for the stations and one million cubic metres of concreting.
The project also includes traffic and utilities diversions.
In March, Qatar Railways Company (Qatar Rail) had signed a USD 700 mn contract with a consortium led by FCC of Spain to build a section of the Doha Metro Red Line. Other members of the consortium are Archirodon (Greece), Yüksel (Turkey) and Petroserv Ltd (Qatar).
Earlier this month, Qatar Rail awarded one of the largest-ever single-project tunneling and rail construction insurance policies to a six-member consortium of Qatari insurance firms, led by Qatar Insurance Company (QIC).
The other five members of the consortium are Qatar General Insurance and Reinsurance Company, Al Khaleej Takaful Group, Doha Insurance Company, Qatar Islamic Insurance Company and Al Koot Insurance and Reinsurance Company. QFC-registered companies Doha Bank Assurance Company and SEIB Insurance and Reinsurance Company are also in the programme.
Tunnel boring machines
Meanwhile, Qatar Rail has taken delivery of the first of 21 TBMs, named Lebretha and manufactured by Germany’s Herrenknecht. It is the first of four TBMs which will be launched for the Doha Metro as part of the Red Line North project, the design and build (D&B) joint venture that is being led by Italy’s Salini Impregilo, with South Korea’s S K Engineering & Construction Co. Ltd, and Galfar Al Misnad Engineering & Contracting.
TBM Lebretha will be assembled and launched from the Al Wahda site towards West Bay Central. At West Bay Central it will be disassembled and re-assembled at Al Wahda and then travel towards Doha Golf Course. It will bore the West Tunnel of the Drive while TBM Al Khor will bore the East Tunnel when it arrives.
TBM Lebretha will travel a distance of approximately 7.954 km and take around 22 months to complete (between Q3, 2014 to Q2, 2016). The average speed would be between 14 and 21 metres per day day, depending on ground conditions. Daily excavation quantity would be approx. 680 cubic metres, with a predicted total excavation quantity of 5,408,720 cubic metres.
Each of the TBMs measures 7.05 metres in diameter and 120 metres in length. To ensure transportation is successfully managed, TBM Lebretha was dismantled into 22 sections which were easier to transport, including the cutter head.