| 摘要 |
Pile or like structural column produced in earth situs by drilling with continuous flight auger to define cavity of requisite depth, withdrawing auger by successive incremental extents and maintaining auger affixed against axial movement at top of each said extent while feeding and compacting column-forming material, through hollow shaft of auger, into each respective cavity extent, until series of successively formed extents produce integrated column. Closure on inner end of hollow auger shaft operable to stop flow of material at any depth of cavity. For forming concrete pile, closure means operable to form enlarged base or bulb of self-hardening material at bottom of cavity to increase load-bearing capacity of the formed pile.
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