| 摘要 |
PURPOSE:To avoid troubles with the performance of reinforced concrete piles even when the upper layer of the piles is housed in a covering cylinder by housing unsuitable upper concrete layer mixed with impurities in a precast concrete or steel cylinder fixed to the head of the pile. CONSTITUTION:An unsuitable upper concrete layer 7' mixed with impurities such as cut dust of concrete, bentonite fine powder, etc., having less than a given strength, is housed in a precast concrete or steel cylinder 2 fixed to the head of a reinforced concrete pile A. Since the performance of the head of the pile A is shared by the cylinder 2, no trouble with the given performance of the pile occurs even when the upper layer 7' of the concrete 7 is housed in a covering cylinder. |
