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Sat 14 Apr 2007 05:14 PM

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RTA launches new installation rigs on Metro

The number of launching gantries used for the installation of viaduct deck segments for the Dubai Metro will increase from three to seven by the end of this month.

The number of launching gantries used for the installation of viaduct deck segments for the Dubai Metro will increase from three to seven by the end of this month.

The gantries provide a fast-track installation process, which enables a complete viaduct span to be erected in two days, according to the Roads and Transport Authority (RTA) in Dubai.

Concrete segments are transported, on demand, from Jebel Ali Casting Yard to the launching gantry sites using heavy haulage trucks, said an official from the Dubai Metro, RTA.

LG1, LG2, LG3, and LG5 are located near the proposed metro stations in Al Garhoud, Jafiliya, Burj Al Arab and Dubal respectively, and will join the three currently operational launching gantries to create seven work fronts for the installation of concrete deck segments used to form the rail viaduct spans.

LG4, LG6 and LG7 are currently operational and can be seen installing viaduct spans along Sheikh Zayed Road, at Mall of the Emirates, Jebel Ali Free Zone and Jumeirah Lake Towers.

There will be around 12,000 pre-cast concrete viaduct deck segments used for the Red Line, each weighing in excess of 50 tonnes. The segments typically measure 10m wide by 4m long and 3m high. The length of the spans varies from 24m to 72m; the minimum number of segments per span is eight and the maximum is 18.

The launching gantry installation process is a construction method widely used around the globe. It will be performed in accordance with internationally recognised standards in compliance with pre-planned and approved detailed work methodologies. Major works will be executed outside rush hours.

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