Always a Winner with HOBAS CC-GRP - Microtunneling HOBAS Jacking Pipes for a Combined Sewage Collector in France
Aug 24, 2011
Construction site, general
Only shortly after receiving the renowned international No-Dig Award from the ISTT (International Society for Trenchless Technology) at the No-Dig fair in Berlin for the best project 2010, HOBAS has come up trumps at the VST (Ville Sans Tranchée), No-Dig trade fair, in France for supplying pipes for the best construction site 2010. The project awarded by the FSTT (French Society for Trenchless Technology) comprised 1340 m of De (external diameter) 1940 mm pipes installed by microtunneling for a combined sewage collector with a total capacity of 3300 m³ and was implemented by the city Rennes in France.
|Three manholes were installed 200 to 250 m apart from each other and 2 special chambers, one hosting a flushing and the other equipped with a vacuum system for deodorization, have been included along the collector. Preparing for their installation, the contractor neatly cut the soil and cast concrete to establish walls around a part of the pipe route without prior excavation works and before the boring machine had passed the section. After the concrete had cured, the bore head drilled through the established walls and the soil around the pipe in the concrete chamber was excavated; either completely as for the flushing and deodorizing chambers or down to the pipe in order to install the tangential manholes. The latter were erected by cutting and laminating a HOBAS DN 1000 GRP Pipe vertically onto the jacking pipe DN 1800 and the easy handling and manipulation of GRP on site considerably facilitated and sped up the process.|
|Year of construction||2010|
|Installation time||13.5 months|
|Total length of pipeline||1340 m|
|Pressure Class||PN 1|
|Stiffness Class||SN 64000|
|Application||Combined sewer collector|
|Contractor||SADE & SMCE Réha|
Resistant to H2S, possibility to opt for trenchless installation,
remarkable hydraulic properties, long product life
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HOBAS France SAS
95523 Cergy Pontoise Cedex, France