JP2007132008A - Structure of jacking pile, and its burying method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pile structure and a pile burying method for general piles, stabilizing construction without causing torsion and positively securing bearing power by protecting the pile with a casing. <P>SOLUTION: In the pile structure, a cap provided with bottom enlarging blades is put over the tip of the pile, and the pile is covered with a casing with a spiral blade. When the pile is rotated and buried, a large diameter hole is formed according to the size of the blade, and excavation is smooth because of the two-stage type blade. When pulling out the casing, it is pulled out by reverse rotation. The ground is thereby compressed by the blade, and the bearing power of the pile can be secured by compaction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a structure of a propulsion pile for embedding a foundation pile in a foundation ground and an embedding method thereof.

  In laying foundation piles, piles that bury piles with no noise, no vibration, and no soil and their construction methods are also shown in the following references to solve various problems against pollution. As is known, several known examples have been developed.

In this known example, a screw blade is provided on the pile itself, or a rotary device is attached to the pile head using a bladed casing and screwed and buried.
JP 2003-147770 A JP 2004-52538 A

  The piles provided with the blades shown in the above-mentioned known examples, or those screwed with a casing with blades are excellent in terms of noise-free, vibration-free and soil-free. When the rotation is transmitted to the excavation blade at the tip of the pile, the rotation of the pile causes twisting of the pile due to the resistance of the blade, resulting in upset in the vertical burial and lowering the bearing capacity of the pile In addition, there is a disadvantage that the rotation speed is reduced.

  The inventor has reached the present invention as a result of continuing the prototype research in view of the above points, and the present invention, as shown in the figure, shows the propulsion cap (20) at the tip of the pile and the casing to be excavated. (30) is provided in two stages with the spiral blade (31), and the propulsion force propelled by transmitting the propulsion rotation by the auger to the cap at the tip of the pile is strengthened, and the twist of the pile caused by the rotation is increased. Can be prevented.

And by transmitting the rotational force of this auger to the tip of the casing integrated with the pile, the excavation propulsion is accelerated and the work efficiency is improved, and the pile is buried in a predetermined position and the casing is pulled out. By making the rotation of the auger reverse, the stopper (32) locking the pile cap (20) and the casing (30) is removed, and the casing (30) is pulled out while rotating in reverse. The remaining soil to be discharged is compressed and the periphery of the pile is pressed.

  Further, when the casing (30) is pulled out in this way, the excavated ground is pressed and compacted by the spiral blade (31) provided in the casing, and a stable ground is formed. And the improvement of the bearing capacity of the pile is promised with the solidification of cement milk to be injected later.

  As described above, the pile of the present invention and the construction method using this pile are superior in comparison with the conventional foundation because the construction period of the foundation is fast due to the burial with the excavation blades provided in two stages, and there is stable settlement of the pile. It has the effect of construction.

  Embodiments of the present invention will be described with reference to the accompanying drawings. FIGS. 1 to 3 show a structure of a pile. FIG. 1 is a cross-sectional view showing a part of a steel pipe pile (1). A lid (2) is provided. A protrusion (4) having a through hole (3) at the center is joined to the lid (2).

  FIG. 2 is a cross-sectional view of the cap (20) attached to the forefront of the pile shown in FIG. The cap (20) is provided with a bottomed blade (25), and a wide hole is excavated by the bottomed blade. The bottom of the cap (20) is provided with a bottom plate (21) having a hole (22) in the center, and is attached to the forefront of the pile (1) shown in FIG.

When appropriate, the projecting piece (4) provided in the pile (1) is exposed through the hole (22) in the center of the bottom plate (21) of the cap (20), and is exposed through this. As a result, the hole (3) of the protruding piece is exposed, so that the wedge (23) is driven into the exposed hole (3) as shown in FIG. 3 to fix the cap (20) to the tip of the pile. Integrate. Therefore, the pile (1) is fixed with a cap (20) having a widened blade (25) attached to the tip, and is buried as a foundation pile in this state as will be described later.

  FIG. 3 shows a structure of a propulsion pile covered with a casing (30) provided with a spiral blade (31) on the outer periphery, and although not shown, the upper end is connected to an auger and rotates. And excavating and embedding. The fixing of the casing (30) and the pile to be mounted is stopped by the stopper (32) provided at the tip of the casing (30) being in contact with the expanded bottom blade (25) provided on the cap (20), The rotation of the auger (referred to as positive rotation) is transmitted to the cap as it is through the casing (30), and the bottom expansion blade (25) is rotated. Therefore, in the present invention, excavation is advanced by the upper and lower two-stage blades of the cap (20) and the expanded bottom blade (25) interlocked with the spiral blade (31) of the casing (30).

  The embedding method using the propulsion pile according to the present invention will be described with reference to FIG. 4. In the present invention, a steel pipe pile is described, either a concrete pile or a composite pile of a concrete pile and a steel pipe pile. However, the same applies to the embedding method.

  FIG. 4 is a burying means using the pile of the present invention, and its characteristic process will be described with reference to FIGS. Step a is an embodiment diagram of embedding, and the pile of the present invention shown in FIG. 3 in the hole that has been dug, that is, the expanded blade (25) is provided at the tip, and the casing of the spiral blade (31) is covered. The mounted pile is inserted while rotating in the above-mentioned direction, and the shape of the hole is adjusted and inserted.

At this time, although not shown, the bottom of the hole is enlarged and formed into a spherical shape by the expanded bottom blade (25). FIG. b shows an embodiment in which the auger is reversely rotated and the casing (30) is pulled out leaving the pile body (1). When the auger is rotated in the reverse direction, the stopper (32) provided at the tip of the casing shown in FIG. 3 is disengaged from the expanded blade (25), and the casing (30) is rotated in the reverse direction, leaving the pile (1). In this case, the outer surface of the hole is pressed by the spiral blade (31) provided on the outer periphery of the casing to form a prepared hole surface. Combined with solidification, a strong and stable support force is constructed.

  As described above, the present invention is capable of excavation without noise and vibration, and without soil removal, and can be constructed more efficiently than conventional methods. The utility value is great.

Cross section of the tip of the pile used for construction Cross section of pile cap Cross-sectional view of a pile with a bladed casing (A) Example diagram in which piles are embedded (b) Example diagram in which the casing is pulled out leaving the piles

Explanation of symbols

1 pile
2 Pile bottom plate
3 wedge holes
4 convex pieces
20 cap
21 Cap bottom plate
22 holes
25 Expanded bottom blade
30 casing
31 Spiral feather
32 Stopper
33 Wedge

Claims (2)

  A propulsion cap attached with two expanded bottom blades crossed and attached to the tip of the pile is attached and fixed, and a stopper is provided on the casing provided with spiral blades on the outside of the pile to fix the pile to the pile. The structure of the propulsion pile which provided the excavation blade made up and down in two steps. Using the propulsion pile according to claim 1, the pile is embedded by rotating the auger, the auger is reversely rotated after being embedded, the fixing of the stopper is removed, and the casing is pulled out while leaving the pile, 2. The method for embedding a propulsion pile according to claim 1, wherein the surrounding ground is pressed and compacted by the rotation of the blades of the casing.

Images