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CFA Piling: Preventing ground & rig instability through over-flighting

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1. INTRODUCTION

The purpose of this document is to outline the key factors that may lead to settlement or instability of the piling rig when carrying out Continuous Flight Auger (CFA) piling as a result of over-flighting and to present best practice to mitigate these risks. This document is not intended to replace the requirements to use competent supervision and operatives when carrying out CFA piling. This guidance will be of interest to piling contractors, geotechnical designers, planning supervisors and others concerned with the specification, selection and procurement of works involving piling.