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Doha: Underground Metro tunnelling begins

Qatar metro is seeing the first underground drilling operations, using five massive German-designed boring machines.

Herrenknecht has supplied TBMs for projects globally, including this one for a project in Algeria.
Herrenknecht has supplied TBMs for projects globally, including this one for a project in Algeria.
Needing only one point of entry, TBMs can tunnel below city streets.
Needing only one point of entry, TBMs can tunnel below city streets.

The planned multi-billion-dollar Doha Metro project is seeing its first drilling operations, ith massive German-made tunnel boring machines (TBM) set to work on the mega-project.

Excavation works around the city witnessed Phase 1 of the project by the Qatar Rail Company (QRC), which oversees the construction of Qatar's railways network. This involves the construction of an 84km rail network inside the city.

Four TBMs are positioned at Al Mayeda, Al Khor, Lehwaila and Al Wakra and were were manufactured by Germany’s Herrenknecht. They will be used for the Red Line North and South Underground projects.

Local daily, Sharq, said, “QRC has started working on the underground tunnels and will announce the official inauguration of work shortly.”

QRC is using 21 giant-sized boring machines made by German specialists Herrenknecht as part of a deal signed last year.

Each TBM will travel a distance of between seven to nine km and will take approximately two years to complete their respective journeys. The TBM average speed will be between 12m per day to 21m per day, depending on ground conditions.

Daily excavation quantity will be over 600m³, with an estimated predicted total excavation quantity of over 5,000,000m³, reports The Edge.

Each of the TBMs for the Doha Metro measures 7.05m in diameter and 120m in length. They are shipped in parts and assembled on site.

The underground and ground drilling work will be completed within two years before the metro project is launched in later 2019.

QRC has awarded contracts worth billions of dollars over the past two years to several local and foreign companies for the metro, one of the world’s most advanced rail systems. It will have four lines and will be an integral part of the larger Qatar rail network, which will include long-distance rail for passengers and freight linking Qatar to other Gulf countries and Lusail industrial city.

Qatar Rail is awaiting the delivery of a further 16 TBMs – these are expected to arrive in Qatar over the coming months, to be utilised between the Red Line North, Red Line South, Green Line and Gold Line Underground projects.

 

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Construction Week - Issue 748
Sep 01, 2019