Articles & Case Studies

Boring lessons

Posted: Wednesday 15th October 2008

Trenchless technology has played a crucial part in minimising disruption during flood alleviation works, at a school in Greater Manchester. Specialist contractors, Perco, confronted difficult ground conditions but used a unique auger boring rig to install a new sewer, on time and without digging up the road.

A school on Roundthorn Road, Oldham was close to reopening after a holiday when the auger boring team arrived to begin work for Balfour Beatty Utility Services. With a four-week window to install the new sewer, Perco completed the project two days ahead of schedule, working seven days a week with extended hours.

The existing system was made up of a combination of clay pipe and Victorian flag-topped sewers. Following periods of heavy rain this had proved inadequate, causing flooding to nearby properties. Perco worked between new manholes to install 156m of 600mm ID Denlok clay pipe alongside the old system.

Using a Bohrtec BM500 guided auger boring rig, the company shipped in some unique ancillary equipment from Berlin, specifically to handle the large size of the clay jacking pipes. This comprised 770mm steel casing and an extension arm for the rig.

Ground conditions were hard (15 SPT) and insertion of the pilot rods located two boulder obstructions, which were removed by localised excavation. Despite these difficulties the Perco team succeeded, using a three-stage auger boring technique under laser guidance.

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