| 摘要 |
<p>A piling auger (1) includes a fixedly mounted element (5) which is arranged so as to extend beyond the circumference of the flight (3) of the auger (1). The element (5) is configured so that when the auger (1) is first rotated in a given direction and allowed to penetrate the ground to a predetermined depth, a first spatial volume is swept out by the element (5), and when the auger is withdrawn from the ground with continued rotation in the given direction and with concomitant supply of concrete or grout to the tip (4) of the auger (1) a second spatial volume is swept out by the element, the second volume being greater than the first volume. In this way, a pile having a circumferential helical concrete or grout projection is formed without undue disturbance to the surrounding soil during penetration, thereby enhancing the end bearing capacity and skin friction of the resulting pile.</p> |
