Renovation of a sewer at Amsterdam Airport Schiphol

In June 2002 the runway was closed for all air traffic for total maintenance of the runway (new asphalt, lightning, landing equipment etc.). Only 17 days were allowed to close the runway, so the team worked 24 hours per day, workdays and weekends. In this short time, totally 73 meters of HOBAS CC-GRP Relining Pipe Systems of DN 700, 380 meters of DN 800, 120 meters of DN 1000 and 186 meters of DN 1200, all PN 1 SN 16000 were relined for 8 rainwater sewer pipelines crossing below the runway. The reduction in pipe diameter (as opposed to DN 1000 of the old concrete pipeline) was accepted due to better flow capacities of HOBAS CC-GRP Pipe Systems on the one hand and less flow through needed on the other hand. The high stiffness was necessary due to high airplane landing and take-off loads and was calculated by a consultant. HOBAS CC-GRP SewerLine was chosen because of the stiffness higher than 10,000, the flexibility for renovation and the possibility to cut the pipe in the field without special equipment. The total renovation was easily done. There were no problems with the deformation of the concrete pipes. The space between HOBAS CC-GRP Relining Pipe Systems and the concrete pipe was filled up with lightweight concrete.