Putzmeister in Burj Dubai record.
Putzmeister creates new pumping record
01 December 2007
Putzmeister has bettered its own pumping records by conveying high-strength concrete to a world-record height of 601 m at the fast rising Burj Dubai tower, now the world’s tallest building.
Readymix contractor Unimix achieved the feat using a Putzmeister super high-pressure concrete pump early last month (November) much before schedule.
“The record was set at the prestigious high-rise project by concreting a wall of the centre core,” says a spokesman for Putzmeister.
The pumping height is calculated by the length of the ascending pipes inside the building plus the vertical conveying line of the column and the stationary boom.
The concrete pour was achieved on level 155 at a height of 585 m. “High-rise concrete pumping at Burj Dubai has not been finished yet but comes within view.
“Due to the smoothly running stationary concrete pump, the final conveying height has been determined on 611 m. Beyond this height the Burj Dubai tower will be a steel construction,” he adds.
Commenting on the challenges faced on the project, the spokesman says: “By reaching this height, the stationary Putzmeister super high-pressure concrete pump BSA 14000 S HPD was working with concrete pressure of 189 to 204 bar in the pipe system depending on the piston speed from 5 to 7 sec per stroke.
“Under these circumstances, it was possible for us to effectively pump about 23 to 32 cu m of concrete.
“The high-strength concrete was conveyed through a heavy-duty pipe line with an internal diameter of 150 mm, which was fitted to extend to almost the entire delivery height of the project.
“It was only for the uppermost 10 storeys that standard Putzmeister ZX pipes of 125 mm diameter were used,” says the spokesman.
“Massive wall brackets were used to hold the concrete pipes, which weighed over 55 tonnes (including the concrete).
“In addition, Putzmeister had to design a special hydraulic device to lift the entire vertical piping system especially for maintenance operations such as changing the wornout pipes,” he concludes.
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