A Method of Making Concrete or Reinforced Concrete (Ferro-concrete) Piles.

摘要

29,710. Wilhelmi, O. Jan. 27, [Convention date]. Piles.-In the construction of concrete piles by means of a preparatory driving-tube a, this tube, after being driven, is filled with liquid concrete c, and is then withdrawn a certain distance, again filled at d, closed at the top, and again driven so that the concrete is caused to expand. The operation may be repeated, and the enlargements may b e made at any desired height. The operation may be assisted by means of wedges f, Fig. 5, placed in the concrete.