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Guided Auger Boring Aids River Quality Improvement Work

Guided Auger Boring Aids River Quality Improvement Work
10/03/2017

Specialist trenchless contractor, Trenchless Solutions Ltd (TSL) was required to install two grade-critical guided auger bore installations as a specialist subcontractor for client United Utilities (UU) as part of the Blackburn UID works, Audley Range and Queens Park Road project. The works and the engineering planning were carried out by UU with J.K Guest Group being appointed as the main contractor for the project.

Investigations of the ground conditions prior to planning of the project showed that, at the level of the pipe installation, conditions consisted of soft to stiff clay which was ideal for the guided auger boring technique chosen for works. As well as being well-suited to the prevailing ground conditions the method also meant that the gravity sewer being installed could be accurately aligned on both line and grade, the latter being critical to the success of the installations.

The two bores required to complete the project comprised one pipeline of 57 m in length and another of 60 m in length at depths of about 4 to 4.5 m respectively. Both of the pipes were installed using DN700 GRP Hobas jacking pipe.

The start date was 16th August 2011 and with a finish date 16th September 2011 both the guided auger installations were completed in just 20 working days, including set up at both launch pits and the move between launch sites. All the necessary start and reception shafts were installed ahead of the Auger Boring works by the main contractor JK Guest.

Directional control of the pilot bore of the three stage installation is achieved using a monitored optic system using a CCD camera and a diode target plate. Once the pilot bore is completed the second stage is enlargement of the pilot bore with an auger and casings which utilises the initial pilot route as a guide. After enlargement of the pilot to the desired size, the product pipe is jacked into position behind the auger casings with these casing being recovered at the reception pit of the installation.

In this instance the DN700 GRP jacking pipe was supplied direct by Hobas in 3 m lengths, with push-fit joints designed for pipe jacking applications.

For more information follow this link: Guided Auger Boring Aids River Quality Improvement Work

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