| 摘要 |
An apparatus for producing a concrete pile in the ground with an enlarged base, including a tube having a diameter, and an upper and a lower end, a shoe provided at the lower end of the tube and having a larger diameter than the tube so as to form a gap between the tube and the ground, a longitudinal outer casing having a diameter substantially equal to the shoe diameter so as to define a space between the tube and the outer casing, the casing also having a lower end attached to the shoe, and an open upper end so as to allow a free flow of concrete into the space between the tube and the outer casing, a sliding joint provided so as to slidably attach the outer casing to the tube so that a predetermined length of sliding exists between the tube and the outer casing, a pile having a free-falling hammer, the tube, with the outer casing attached, being drivable into the ground by the pile to a depth greater than the length of the outer casing so as to form an opening in the ground and define the gap between the tube and the ground, means for supplying concrete to the gap and the space so that the gap and the space are filled with concrete as the tube with the attached outer casing is driven into the ground, means for expelling the shoe from the lower end of the tube and the outer casing, along with some of the concrete, so as to form the enlarged base, and a traction cable attached to the upper end of the tube so that the tube is raiseable from the shoe after the enlarged base is formed so as to cause the tube to slide upwardly with respect to the outer casing, thereby allowing concrete from the space to enter the volume of space previously occupied by the lower end of the tube, the tube being raised to a point where both the tube and the outer casing are removed from the ground so that the concrete from the gap and the space fills the resulting opening.
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