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German trenchless pipe bore gives home a new waste link

German trenchless pipe bore

A Grundobore auger-boring unit from Tracto-Technik was recently used to install a new canal for a wastewater connection to a family home in Wildeshausen, Germany. This followed signs that some fractional damage was causing the connection to block regularly and needed to be rinsed free constantly.

Just two years ago the road had been renewed and a repair or new installation for the house connection by open trenching would have split the supporting layer of tarmac and caused subsequent road subsidence.

The new link was to be made from the main canal shaft to the house connection shaft 18m away using trenchless pipe installation technology. The steerable unit Grundobore 200 S was selected as it can work inside a 1m-diameter shaft.

A rainwater canal lay adjacent to the previous wastewater canal at the same depth. The bore was therefore set inside the 4m-deep main canal shaft at a height of 3m. The new canal pipe now runs in a gradient of 5% to the ground level of the house connection canal. The bore path crosses beneath the service pipes inside the pavement area and the foundations for the premises wall. The new canal pipe ends at a specially-excavated pit (1.2m long x 1.2m wide x 2.5m high), which also helped make the expanding and installation work easier, as well as the hook-up to the house connection canal. It would have also been possible to link directly to the house connection shaft.

Leer-based construction firm Huneke was contracted to conduct the work. The steerable bore

was carried out from the main canal shaft up to the pit ahead of the main connection shaft. The Grundobore 200 S, made by Lennestadt-based Tracto-Technik, consists of two components: the press frame and the bore drive. At a depth of 3.3m, a platform was installed. A hydraulic power unit type TT B20 was available to drive the Grundobore 200 S.

First, the Grundobore 200 S drove a core bore with a diameter of 250mm into the shaft wall. This took around 10 minutes. After changing the bore tools, the steering head with an integrated sonde went into action. The degrading of 5% had to be maintained at the same time. Inclination, depth, position, direction and roll angle of the borehead were constantly checked and, whenever necessary, the direction or inclination deviations were evened out accordingly. The pilot bore with an 82.5mm diameter was completed in 60 minutes.

Following that the pilot bore was expanded in the opposite direction with a winged borehead. The spoils produced during the bore were conveyed out of the borehole, protected by the retrievable pipes (Ø170mm) with a spiral conveyer back to the excavated pit.

After this step was completed the Schöngen protection pipes PP-HM 170x12mm, with an effective length of 450mm, were pushed in from the canal shaft and connected with sockets in both shafts and sealed off accordingy.

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