Groningen (NL) Sets on HOBAS® CC-GRP Pressure Jacking Pipes
Dec 19, 2008
Environmental aspects and future-oriented thinking lead the municipality of Groningen in the Netherlands to extending their existing sewer main sized DN 1000 and DN 1200. The gravity sewer main could not cope with high flow rates occurring during e.g. heavy rainfall. To prevent sewage from overflowing and polluting nature the authorities decided to convert it into a closed pressure system. With this and its extension by 2.4 km HOBAS CC-GRP Sewer Systems a capacity of 3000 m3/h will be achieved so that the line would easily cope with future needs as well as the connection of a further village.
Several obstacles along the pipe route, such as roads and a channel, were overcome by microtunneling. Due to the requirements by the road authorities two jacking sections running beneath the highway were realized with cover pipes which were also delivered by HOBAS Benelux, the HOBAS CC-GRP Pressure Pipes were consequently inserted. The largest with an outer diameter of 1500 mm was utilized beneath highway A7.
The three other microtunneling sections were implemented with in this field unique CC-GRP pressure jacking pipes PN 6 and flush FWC couplings. These run beneath a gas pipeline, a main road, several streets and a navigable channel where the installation was conducted in 12 m depth. A 275 m long section with CC-GRP pressure jacking pipes of 1280 mm outer diameter was jacked in a curve radius of 1300 m. The contractor decided to install an intermediate station which according to safety standards is required for jacking with over 4000 kN. Due to the smooth and non-absorbing outer surface of HOBAS Pipes their light weight and constant outer diameter, the maximal jacking force did not exceed 1800 kN. The intermediate station was therefore never in operation.
Thanks to innovative HOBAS CC-GRP Pipe Systems and the constant support of HOBAS Experts, all involved parties look back to a smooth and unobstructed implementation, Groningen is prepared for future needs and Mother Nature can breathe a sigh of relief.
Contact:
HOBAS
Alexandra Dobnigg
Pischeldorfer Straße 128
9020 Klagenfurt - Austria
PH.: +43 463 482424-38
FAX: +43 463 482121
E-Mail: alexandra.dobnigg@hobas.com
Internet: www.hobas.com
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Contact
HOBAS Engineering GmbH
9020 Klagenfurt, Österreich
Phone:
+43.463.482424
Fax:
+43.463.482121