Currently, the project is on track for a 2018 launch where this state-of-the art integrated metro line will be one of the most advanced rail transit systems in the world, covering four lines that span 300 kilometres and 100 stations.
Construction of the Red Line, also known as the ‘Coastal Line’, commenced in 2014, and has a total of 14 underground and five elevated (at-grade) stations in the first phase, with a total route length of 40 kilometres. A total of nine tunnel boring machines (TBMs) have been allocated to the Red Line where to date, they’ve excavated an aggregate volume of 1.7million m3.
North underground expertise
Salini-Impregilo is leading the construction of the Red Line North Underground, in a joint venture with SK Engineering Construction Company and Galfar Al Misnad Trading and Contracting. The first phase includes the construction of seven stations and 26 kilometres of tunnel.
Under Doka’s remit, the formwork scope comprises of supplying formwork for all stations, running between 20 to 35 metres below ground level. 3,700 m2 of Large-area formwork Top 50 are used for the base slabs, outer lining and staircase walls, as the shape, size, tie-hole pat-tern and form-facing of the elements can be adapted to suit any requirement. 560 m2 of the high-performing Framed formwork Framax Xlife were applied for the outer lining walls, while 650 m2 of Framed formwork Frami Xlife, ideal for fast and economical forming, were used for the column and inner platform walls.
A volume of 3,700 m3 Load-bearing Tower Staxo 100 and Heavy-duty supporting system SL-1 were used for the decking of beam and slabs, with an additional 42,000 m3 for shoring of the beams and slabs.
Doka used the Supporting Construction Frame with a 2.40-metre extension to cast the 9.20 metre high outer lining walls in one go. The task was supported by the SL-1 system that allows the passage of Tunnel Boring Machines without disrupting the casting schedule of the concourse slabs.
In order to expedite the progress on site, Doka Qatar provided pre-assembly services for the Large-area formwork Top 50 base slabs, outer lining walls and staircase walls, as well as pre-assembly of the Staxo tables for the beams and slabs.
Acknowledged as one of Qatar’s most important infrastructure projects, the Doha Metro North Underground project received a visit from Qatari Prime Minister, His Excellency Abdullah bin Nasser bin Khalifa Al-Thani, on 19th April 2015, who inspected the new network from the site of Al Qassar station.