Home NewsEngineering Asia Dubai progresses work on mega storm water tunnel project

Dubai progresses work on mega storm water tunnel project

A delegation from Dubai Municipality, headed by its Director-General, Dawood Al Hajiri, has visited the Chinese city of Guangzhou to sign factory acceptance certificates for two Tunnel Boring Machines (TBMs) needed for excavation work on Dubai’s Deep Tunnel Storm Water System (DTSWS) project.

The Deep Tunnel Storm Water System project is needed for Airport City-Expo 2020, one of the most vital and strategic projects in the Emirate of Dubai. The TBMs, which have been manufactured by China Railway Engineering Equipment Group (CREG), were ordered by the Porr-Six Construct joint venture (JV) – Dubai Municipality awarded the tunnel contract to the JV in October 2017.

Other members of the delegation included Christoph Duempelmann, project director of DTSWS from Porr, and Francois Springuel, deputy project director from Six Construct and Dr Jayapregasham Tharamapalan, project director from the municipality.

The two TBM machines, which will be the largest in the United Arab Emirates, are expected to arrive at the site in October 2018 with excavation due to start in December. The cutting diameter of one TBM machine will be 11.05 metres and the average daily drilling will be 19 metres per TBM – the finished internal diameter of the tunnel will be ten metres.

Dawood Al Hajiri said that TBM 1 will begin its drilling work from the starting of the seventh intersection on Sheikh Zayed Road for a distance of 2.4 km towards the sea up to the location of the main pumping station, then be dismantled and reassembled to move from the seventh intersection until the eighth intersection along 1.7 km.

In parallel, the second TBM drilling machine will start work from the Expo intersection on Jebel Ali – Al Habab Street for a distance of 5 km and will continue until the eighth intersection on Sheikh Zayed Road, he said.

He added that manufacturing and installation of one device will take 364,000 man-hours, noting that the daily energy consumption of the first device will be 64 MW taking the total consumption in 12 months to approximately 20,156 MWh. The second device will have a daily electricity consumption of 58.738 MW taking the total consumption in 14 months to 21,380 MWh.

“The drilling will be done in two types of soil; the weak rocky soil and clay soil with an average depth of 42 meters. The tunnel with a diameter of 10 metres will consist of eight concrete segments per ring, each 35 cm thick. There will be two segment types – 1.6m and 2m wide and each piece will be weighing seven tons. These pieces will be fixed by iron pegs and sealed with epoxy,” said Al Hajiri.

The Dubai Deep Tunnel Storm Water System, designed by Stantec in Dubai, is one of the largest integrated drainage tunnels in the region and has allowed adoption of Sustainable urban Drainage Systems for the first time in the UAE.

The system has five elements, a groundwater and stormwater collection network; a 10km, 10m diameter, 45m deep tunnel; a holding pond; high efficiency pumping station; and a sea outfall. The design also allows for future solar power generation from a floating solar park on the holding pond.

When complete the tunnel will manage rainwater and groundwater, draining almost 40% of Dubai’s entire urban area and cover an area of 490 square km including Dubai South, Al Maktoum International Airport, Expo 2020 Dubai and other neighbouring localities.

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