Increase the capacity of wastewater pipeline leading to the wastewater treatment plant of Banská Bystrica

A ,concrete interceptor was originally installed. However, having reassessed its hydraulic qualities, the client reconsidered and opted for HOBAS CC-GRP (glass fibre reinforced plastics) Pipe Systems. After the delivery of a HOBAS® SewerLine® DN 2000 Pipe, the works were stopped for the project was included in the European Pre-Accession Program ISPA. The project was technically filed by EU experts and redesigned to utilize HOBAS CC-GRP HOBAS® SewerLine® DN 1800 Pipes SN 5000. Decisive criteria were leak-tightness, durability, hydraulic and long-term static characteristics as well as numerous similar reference projects involving similar constructions to demonstrate the experience of HOBAS in the field. The construction of the 1st phase of the HOBAS® SewerLine® DN 1800 interceptor was divided into two sections. The first section of 1.8 km was laid by open cut and the second 2.1 km long section was installed by tunnelling. Open cut was chosen for a section where the traffic would not be disrupted. The pipe bed and the zones around the pipes were filled with gravel sand and compacted. The section situated in areas of heavy traffic was constructed with the help of trenchless technology, namely tunnelling. Steel and concrete casing pipes were used for tunnelling. The gap between the HOBAS CC-GRP Pipe and the casing pipe was then filled with suitable material.