Rehabilitation and Completion of Olomouc Sanitary Network

One of the magistrate’s wishes was that the construction time should be kept as short as possible so that the tramway traffic would not be interfered and the strain on the inhabitants is minimized. All these requirements of the magistrate and the technical solution of the project offices affected the decision-making process concerning the pipe material. HOBAS® CC-GRP Pipe Systems were chosen due to their hydraulic parameters, provable leak tightness of the system and the low weight of even large profile HOBAS® CC-GRP Pipes. The whole construction was divided into nine individual construction parts, since each of them called for a different kind of open cut installation. With HOBAS® CC-GRP Pipes of DN 1800, DN 2000 and DN 2400 the trench had to be cased with a Larsen wall. Given the small inclines and non-cohesive earth, the pipe bedding had to be made of reinforced concrete with a longitudinally positioned steel girder to safeguard the 0.32 per mille gradient. The Pipe itself was anchored in the reinforced concrete base with steel plates and was embedded in an ash-cement mix.