JPS5833148Y2 - Peg - Google Patents

Description

[Detailed description of the invention] This invention relates to a pile that can be firmly fixed to the supporting ground.

Conventionally, the lower end of the pile was secured to the supporting ground by pouring concrete into the bottom of the hole in which the pile was to be buried and hardening it, which posed a problem that required construction costs and construction time.

However, in this invention, a push-in fitting was installed at the lower end of the pile body, which was driven into the supporting ground by rotating the pile body.
By rotating the pile body, the lower end of the pile can reach the undisturbed supporting layer of the soil layer and be fixed to the supporting ground, making the above-mentioned foot protection unnecessary.

Note that when the stake body is rotated, harmful rotational torque acts on the stake body, which may cause torsional shearing, but the stake of this invention is mainly used for embedding using the embedding method shown in Figures 1 to 4. According to this construction method, when the pile is inserted, the friction between the side wall of the pile and the hole wall of the vertical hole is almost zero, so there is no risk of torsional shearing even when the pile is rotated. That's not true.

The excavation equipment used for the above-mentioned embedding method is equipped with a drilling blade 2 at the tip of a hollow shaft 1, and a stirring and kneading tool 3, 3 (the stirring rod and kneading rod may be separate) on the upper side of the drilling blade 2. (Fig. 1) A vertical hole 4 is drilled using this excavation equipment. After inserting and sinking a pile 5 into the vertical hole 4 by its own weight, the pile 5 is rotated. This is a construction method in which the push-in fitting 6 is pushed into the supporting ground at the bottom of the attachment hole 4 and fixed (see Figs. 3 and 4).

The drilling device rotates the hollow shaft 1 to rotate the drilling blade 2.
excavates the bottom of the vertical hole 4, and the resulting mud is stirred by the stirring and kneading tools 3, 3, and a part of it is rubbed against the hole wall by the kneading root 3a, compacting and infiltrating the hole. It strengthens the walls.

However, by making the hole diameter of the vertical hole 4 approximately equal to the outer diameter of the pile 5, the pile 5 can be lowered by its own weight after excavation is completed, and there is almost no friction with the hole wall immediately after the pile has been sunk. It is possible to rotate without applying torsional shear force.

Therefore, this invention will be described with reference to the embodiment shown in FIGS. 5 and 6. A push-in fitting 6 with a rectangular plate whose outer side is longer than its inner side is attached to the lower end of the stake body 7 via a metal ring 8.
, four pieces are radially inclined in the same direction with respect to the lower end surface of the stake body 7, and one edge of the metal fitting is fixed to the lower end surface of the stake body by pushing into the lower end of the stake body.

The pile 5 is sunk into the vertical hole 4 by its own weight,
When the lower end reaches the support ground at the bottom of the vertical hole 4, the pile 5 is rotated in the direction of arrow 10 in FIGS. 5 and 6.

Due to this rotation and the weight of the peg 5, the lower edge 9 of the pushing metal fitting 6 pushes away mud from the supporting ground, and the pushing metal fitting 6 digs into the supporting ground.

At this time, the lower edge 9 is always in contact with the undisturbed part of the soil layer in the supporting ground, so this digging eventually results in
This allows the lower end of the pile 5 to be firmly fixed to the supporting ground.

The mud excavated by the biting fittings 6, 6 is pushed out to the hollow part 12 side of the pile 5 by the inclined surface 11 of the pushing fitting 6, and accumulates in the iron part.

That is, according to this invention, the push-in fittings are installed at the lower end of the stake body in a radial manner from the center to the outer periphery, and the lower edge is inclined inward from the outer side. The rotation of the pile causes the push-in fitting to bite tightly into the supporting ground.

Also, since the push-in fittings are tilted in the same direction,
The excavated mud is pushed out into the hollow part of the pile, and
Since the outer edge of the push-in fitting does not protrude outward from the outer circumference of the lower end of the pile body, the inner wall of the hole drilled by the push-in fitting comes into close contact with the outside of the pile body, increasing frictional resistance around the entire circumference of the pile. It has the effect of being able to be firmly fixed.

Furthermore, since the lower edge of the push-in fitting is always in contact with the undisturbed portion of the soil layer in the supporting ground, there is an effect that the lower end of the pile can be firmly fixed to the supporting ground.

[Brief explanation of the drawing]

Figure 1 is a reduced cross-sectional view of a vertical hole being excavated into which a pile will be buried, Figure 2 is a reduced cross-sectional view of the same vertical hole being excavated, and Figure 3 is an implementation of this idea in a vertical hole. FIG. 4 is a reduced sectional view of the example with the stake inserted, FIG. 5 is a partially cutaway front view of the embodiment of this invention, and FIG. The figure is also a bottom view. 1...Hollow shaft, 2...Drilling blade, 3...
...Stirring and kneading tool, 3a...Kneading plate, 4...Vertical hole, 5...Piece, 6...
...Pushing metal fitting, 7...Pull body, 8...
...Metal ring, 9...Lower edge, 10...
・Arrow, 11... Slanted surface, 12... Hollow part.

Claims (1)

[Scope of utility model registration request] When a plurality of push-fittings of the same shape are fixed to the lower end of the stake body through metal rings, the push-fittings are inserted from the center of the lower end of the stake body to the outer periphery so that the ends do not protrude beyond the outer periphery of the stake body. and are inclined radially in the same direction, and their upper edges are fixed to the lower end surface of the stake body, and the push-in fitting has an outer side longer than an inner side.