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Jumeirah Palm Island Tunnel, Dubai, United Arab Emirates
Versatile use of proven systems
The 2,000 luxury villas and 40 exclusive hotels found at The Palm, Jumeirah, are built on sand. More than 100 million cubic metres of sand and rock were required for landfi ll operations to create the island which is in the shape of a palm tree. The 12 km long and 5 km diameter crescent-shaped breakwater is constructed from rock and has been designed to protect the 17 fronds against erosion.
The outer ring with its hotel facilities and a gigantic water park is connected to the trunk by a 996 m long tunnel. Including the entry and exit ramps, the tunnel construction has an overall length of 1.4 km of which around 600 m runs underwater up to depths of 25 m. The triple-tubed rectangular cross-section with three lanes in each individual tunnel along with a central supply tunnel were constructed using the cut-andcover method. Just pumping out the excavation pit took one month.
The cross-section is 38.00 m wide and 9.16 m high, the reinforced concrete bottom plate has a thickness ranging from 1.54 m to 2.08 m whilst the slab thickness varied between 1.50 m and 2.00 m. The outer walls are 1.50 m thick. Forming, reinforement work and concreting were carried out using the separate casting method. In 25 m long concreting steps and four cycle sequences, the tunnel bottom plate, two wall sections respectively and then the slab could be concreted one after the other.
PERI system components from the VARIO girder wall formwork system provided the ideal basis for all areas. Then the load-bearing GT 24 formwork girders as well as SRZ steel walers could be used very fl exibly as slab formwork as well. The concrete loads during onstruction of the tunnel slab were safely transferred into the bottom plate via PD 8 shoring towers.
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| PERI Systems In Use |
GT 24
VARIO GT 24 Column formwork
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Walter Freitag
Site Manager
“With the PERI systems, we were able to achieve a fast cycle sequence. They are simple to operate and can be used very fl exibly. In addition, PERI provided us with the required technical support on the construction site.”
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PERI Handbook 2008
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