Patent ID: 6116819
Filing Date: 2000-09-12
Classification: E02D,E21B

Abstract:
A method of continuous flight auger piling, comprising the steps of:i) applying an auger to the ground so as to undergo a first, penetration phase and a second, withdrawal phasewherein one or more of (a) a rotational speed of the auger, (b) a rate of penetration of the auger, and (c) a torque applied to the auger during the first, penetration phase are determined and controlled as a function of the ground conditions and the auger geometry by means of an electronic computer so as to tend to keep the auger flights loaded with soil originating from the region of the tip of the auger;ii) supplying concrete to the tip of the auger during the second, withdrawal phase by way of flow control and measuring meanswherein the rate of withdrawal of the auger is controlled as a function of the flow rate of the concrete, or vice versa, by means of an electronic computer so as to ensure that sufficient concrete is supplied to keep at least the tip of the auger immersed in concrete during withdrawal.