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Contractors World 2010 Volume 1 Issue 4
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McConnell Dowell Corporation Limited has completed the diffuser works, the last remaining section of the Christchurch Ocean Outfall project for Christchurch City Council.
Mark Christison, Manager of City Water and Waste for the Christchurch City Council said, "Congratulations to all for the achievement of this fantastic milestone. CCC are very proud of this project and pass on their sincere thanks to the construction and design teams that have made it happen."
The overall aim of the Christchurch Outfall project is to permanently avoid discharging the city's treated wastewater into the Avon-Heathcote Estuary. The new outfall transports the waste underground from the wastewater treatment plant and discharges it 3km offshore. The project scope involved a 1.8m diameter by 4.8km long outfall pipeline comprising 2.3km of concrete pipeline onshore by microtunnel, and 2.5km of HDPE pipeline laid in a trench offshore
On airport sites, time is a critical factor. The faster a job can be completed, the smoother aviation operations proceed. The time saved on reconstruction of the runway at Zweibrücken Airport, in Germany, was particularly impressive.
German contractor Heitkamp Erd- und Straßenbau GmbH built the 3km runway in just 31 nights instead of the 50 nights originally estimated.
This involved paving of a 13,500m² section each night, although only 8,100m² had been stipulated – achieving a laydown rate that was some 70% higher than required.
A satellite-based GPS and a positioning zone laser transmitter from Topcon picked up the data for the VÖGELE System for 3D Machine Control. Before construction work got underway, the laser transmitter only had to be set up at a fixed point.
A complication for the contractors was that air traffic had to be maintained during the job, so the work could only be carried out at night. All three pavement layers for the 2,950m long and 45m wide runway had to operate under floodlights. Each night, just after the last aircraft had landed, the construction team began to work at 10 p.m. From then on, they had exactly 8.5 hours until the runway had to be handed back to air traffic at 6.30 a.m, clean and cleared of all objects.
Asphalt paving itself had to be finished at 5.30 a.m - necessary to allow sufficient cooling of the fresh pavement in order to make sure that it was firm enough when the first plane touched down.
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Publisher: Roger Lindley
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