Your browser is no longer supported

For the best possible experience using our website we recommend you upgrade to a newer version or another browser.

Your browser appears to have cookies disabled. For the best experience of this website, please enable cookies in your browser

We'll assume we have your consent to use cookies, for example so you won't need to log in each time you visit our site.
Learn more

Bullivant solves science problem with CHD piles

CONTRACTS

TEACHING OF science in schools is set on solid foundations, with 245 continuous helical displacement (CHD) piles for the National Science Learning Centre at the University of York.

Contractor Roger Bullivant started piling in September and the £9M development is scheduled to open in autumn 2005.

Each pile has a core diameter of 300mm with a 600mm diameter flight and were installed to a depth of 11m using a Bullivant 7000 series rig.

The piles are designed to accommodate a 400kN load.

The CHD piling system was chosen to suit the site's difficult ground conditions. Interbedded layers of sand and clay traversing the site mean that the piles need to be both end bearing and reliant on skin friction.

A CHD pile is created using a helical shaped auger attached to the end of a shaft that is screwed into the ground. The bullet displaces material laterally and, at full depth, concrete is pumped down the centre of the shaft under pressure. Rotation of the auger is reversed and concrete fills the profile made by the auger to form a continuous spiral of concrete.

The three storey building will feature a 300 seat lecture theatre, science laboratories and residential accommodation.When complete it will form the centrepiece of a £50M network of nine new regional learning centres.

These will be used to train school teachers and technicians to understand some of the latest advances in science and technology.

Have your say

You must sign in to make a comment

Please remember that the submission of any material is governed by our Terms and Conditions and by submitting material you confirm your agreement to these Terms and Conditions. Please note comments made online may also be published in the print edition of New Civil Engineer. Links may be included in your comments but HTML is not permitted.