AT96 Vienna

Tackling Bridge Drainage

The North Bridge in Vienna, a busy route between the 20th and 21st districts, was in urgent need of repair - not least the surface water drainage system. With their kilometre long spans, Vienna's bridges over the Danube are among the largest in Austria. Due to the physical dimensions involved, the surface water collecting on the multi-lane highways in heavy rain is therefore not to be underestimated. Tire abrasion, grit and other residues mix with the water to form a 'cocktail' that has to be drained and disposed of properly. Little thought was previously given to this problem anywhere in the country and the dirty water simply went down an open drain or ran off somehow. Increasing environmental awareness means that the problem of storm water run-off from roads is finally being addressed. In fact, HOBAS CC-GRP Pipe Systems have already proved their worth in this application at the Lueg Bridge on the Brenner Pass highway.

At the beginning of 1996 the new drainage systemon the Northern Bridge was commissioned. Theadvantages of HOBAS CC-GRP Pipe Systems forsuch projects are obvious. Low weight is vital forsuspension, while the length of 6 meters facilitatesand speeds up installation. Insensitivity totemperature fluctuations and excellent UVresistance guarantee problem-free function and longservice life. The pipe was suspended under the road on both sides of the Northern Bridgeusing stainless steel hangers.Water drains from the road through intake screens and pipes into the main. From there itflows through various pipes at the piers and finally into the storm water sewer. Mud and oiltraps ensure that critical substances are removed before they can do any harm. This not onlyprotects the groundwater, but also solves another wastewater problem.

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Drainage.pdf