Pipe Installation by Guided Auger Boring by Allen Watson Ltd

PROJECT CLIENT: Redrow Homes
LOCATION: Maidstone Kent
PIPE DIAMETER: DN225
PIPE MATERIAL: Vitrified Clay

PROJECT OVERVIEW
A new housing development required the installation of a foul water drain to connect to an existing Southern Water network.

DESCRIPTION OF WORKS
Due to the expected ground conditions of soft to firm, moist orange to grey silty sand with bands of limestone cobbles (HYTHE FORMATION) the design split the drains in to 50 metre sections with each drive approximately 4.5 m bgl. The three drives where to be installed from Ø2.4 diameter caisson drive shaft with 360° thrust wall to support the expected loads which would occur during the installation process. Following the installation of a 50 metre drive the machine was rotated 180° and a second drive of 100 metres was installed from the same shaft.

Space at the site was extremely limited and other factors to be considered were the risk of siltation to two live watercourses in the residential development and causing no damage to the protected trees.

With extremely limited site space AWL were supported by Naylor Drainage new lead time protocol of a direct to site delivery within five working day allowed the delivery of pipes for each individual drive keeping the site foot print to a minimum.
AWL used its own GAB85v guided auger bore machine with optical electronic navigation for all the required drives.

Following the installation of each drive the section was tested in accordance with EN1610.

Allen Watson Ltd

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