| 摘要 |
The combination of a pile driving apparatus having a hammer operating mechanism mounted above a downwardly extending pile sleeve having an internal cross-section dimensioned to receive the top of a pile of a first diameter, whereby the apparatus may be guided onto and supported on the top of a pile, with an adaptor fitted within the pile sleeve and having an internal cross-section dimensioned to receive the top of a pile of smaller diameter than said first diameter, said adaptor being fabricated as a unit and the adaptor unit and pile sleeve being interconnected preventing withdrawal of the adaptor unit from the pile sleeve. The pile driving apparatus, either with or without the adaptor unit may have a pile sleeve including elongate vertical ribs, having upper and lower ends, spaced around and projecting radially inwardly of the internal surface of the sleeve so that the radially innermost edges of the ribs define the internal cross-section and to facilitate guidance of the apparatus onto the top of a pile the innermost edges of the pile sleeve ribs are shaped such that they diverge progressively from adjacent the lower ends of the pile sleeve ribs to a maximum at the location intermediate the upper and lower ends of the pile sleeve ribs and then converge progressively to adjacent the upper ends of the pile sleeve ribs.
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