| 摘要 |
An apparatus 10 and method for forming a screw pile comprises the steps of driving a tool 14,16,18 into the ground using a vibrating drive means 12, possibly comprising a sonic oscillator; rotating and retracting the tool 14,16,18 from the ground simultaneously, causing a blade 20 mounted on the tool to form a helical void in the ground; filling the helical void and the void left by the retracting tool with a liquid pile forming material, such as cement, supplied through the tool 32, 15, 28: and allowing the pile forming material to set. |
