The 3 m large HOBAS CC-GRP jacking pipes were utilised for the trenchless installation of an intercepting sewer leading to the wastewater plant, known as Czajka, in Warsaw.

The pipes’ extra large diameter, along with the extraordinary length of microtunnelled line were not the project’s only impressive features. Thanks to the excellent properties of the pipe material, national as well as international records were broken regarding the single drive lengths from one pit of up to 930 m, the peak installation speed of 36 m per day and the small number of drives in the total of 5.7 km partly curved lengths.

Implemented by assignment of the MPWiK Warsaw (City Waterworks) and supported by the EU Cohesion Fund, the job is part of the largest environmental EU project – Water Supply and Sewage Treatment for Warsaw.

Microtunnelling 5.7 km of a 3,000 mm diameter HOBAS CC-GRP pipes, with state-of-the-art Trenchless Technology, led to the shortest possible installation time. This also kept impacts on the environment and city-life to a minimum. With the combination of installation method and chosen pipe material the PBG Group executed an economically and ecologically beneficial solution providing exceptionally long service life.

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The project drew more than 500 international visitors, to the site in Warsaw during the 13 month installation works and showcased the technological importance this successfully implemented project presents. At the ISTT No-Dig Berlin Gala Dinner, held at the Charlottenburg castle, Chairman Dr Samuel Ariaratnam presented HOBAS and PBG with the award for Czajka.