JPS6233775Y2 - - 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 is driven into the supporting ground by rotating the pile body. By doing so, the lower end of the pile could reach the undisturbed supporting layer of the soil layer and be firmly 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 wall of the vertical hole is almost zero, so there is no risk of torsional shearing even if the pile is rotated. None. The drilling equipment used for the burying method is:
A digging blade 2 is provided at the tip of the hollow shaft 1, and stirring and kneading tools 3, 3 (stirring rod and kneading rod may be separate) are installed radially above the digging blade 2 at appropriate intervals. A vertical hole 4 is excavated by this drilling device (Fig. 1), and the vertical hole 4 is
After inserting and sinking the peg 5 by its own weight, by rotating the peg 5, the push-in fitting 6 is inserted into the support ground at the bottom of the vertical hole 4 and fixed (Figs. 3 and 4).
Figure) Construction method.

In the excavation device, a drilling blade 2 excavates the bottom of a vertical hole 4 by rotating a hollow shaft 1, and the resulting mud is stirred by stirring and kneading tools 3, and a part of it is kneaded. It is applied to the hole wall by the mounting plate 3a, and is consolidated and penetrated, thereby reinforcing the hole wall. However, by making the diameter of the vertical hole 4 approximately equal to the outside 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 sinking is completed. It is possible to rotate without applying torsional shear force to the pile.

Next, this invention will be explained with reference to the embodiment shown in FIGS. 5 and 6. Three push-in fittings consisting of bent plates of the same shape protruding in the shape of a chevron on the lower end surface of the stake body 7 (bent plates with a portion protruding downward as shown in Fig. 8 and bent as shown in Fig. 7). The push-in fittings shown in FIG. 6 are fixed via metal rings 8 at substantially equal distances 1 from each other between their edges. Both ends of the push-in fitting 6 are located on the outer periphery of the thick part of the stake body, and are fixed to the stake body at positions tangential to the thick part of the stake body. Here, the bent plate forming the push-in fitting has a long oblique side 9 and a short oblique side 10, with a part of the lower edge having an apex 11, and is slightly bent toward the outer circumferential direction at the apex 11. 14 Center line of the pile body 5 (17 in Figure 5)
is almost parallel to. When the pile 5 is sunk into the vertical hole 4 by its own weight and its lower end reaches the supporting ground at the bottom of the vertical hole 4, the pile 5
is rotated in the direction of arrow 16 in FIG. Due to this rotation and the weight of the pile 5, one side 13 of the surface having the short oblique side of the push-in fitting 6 pushes away the mud from the supporting ground, and the pushing fitting 6 digs into the supporting ground, while the long oblique side The ground is smoothed by the edge 14 of the surface. At this time, the lower edge 15 of the push-in fitting 6 is always in contact with the undisturbed part of the soil layer in the supporting ground, so this biting ultimately firmly fixes the lower end of the pile 5 to the supporting ground. It is possible to do so. The mud excavated by the push fittings 6, 6 during digging is pushed out toward the hollow portion 12 of the pile 5 along one side 13 of the short oblique side of the push fittings, and accumulates there. Although the lower edge of the bent plate is formed by the long oblique side 9 and the short oblique side 10, the oblique sides may be of equal length.

That is, according to this invention, since the push-in fitting made of a chevron-shaped bent plate is connected to the lower end of the stake body, there is an effect that the push-in fitting is tightly bitten into the supporting ground by the rotation of the pile body. In addition, since the push-in fitting is installed in the thick part of the lower end of the pile body with both edges parallel to the outside surface of the pile body, the diameter of the hole drilled by the push-in fitting will not be larger than the outside diameter of the pile body, and the peripheral wall In addition to being in close contact with the pile body, it has the effect that when a hole is excavated at one end of the push fitting, the soil layer on the wall of the hole is not disturbed, where the peripheral wall of the hole is smoothed at the other end. Furthermore, since the pushing metal fitting is in contact with the inner periphery of the thick part of the pile body, there is an effect that the excavated mud is pushed out into the hollow part of the pile. As a result of the above-mentioned effects, the lower end of the pile can be firmly fixed to the supporting ground.

[Brief explanation of the drawing]

Figure 1 is a reduced sectional view of a vertical hole being drilled into which a pile is to be buried, Figure 2 is a reduced sectional view of the same vertical hole being excavated, and Figure 3 is a reduced sectional view of an embodiment of this invention in a vertical hole. Reduced sectional view of the state in which the stake is inserted,
Fig. 4 is a reduced cross-sectional view of the pile with the stake sunk in, Fig. 5 is a partially cutaway front view of the embodiment of this invention, Fig. 6 is a bottom view, and Fig. 7 is a plan view of the push-in fitting. FIG. 8 is a side view as well. 1...Hollow shaft, 2...Drilling blade, 3...Stirring kneading tool, 3a...Kneading plate, 4...Vertical hole, 5
...Piece, 6...Pushing metal fitting, 7...Piece body,
8... Metal ring, 9... Long hypotenuse, 10... Short hypotenuse,
11...Top, 12...Hollow part, 13...Side, 1
4...edge, 15...bottom edge, 16...arrow.

Claims (1)

[Scope of utility model registration request] In a pile in which a plurality of push-in fittings of the same shape are fixed to the lower end of the pile body through a metal ring, and the pile body is fixed to the ground while being rotated, the push-in fittings are perpendicular to the lower surface of the metal ring, and the edges are spaced apart. They are planted at approximately equal intervals, and the lower edge of this push-in fitting is partially atop and is formed by two oblique sides of different lengths, and both end edges are formed almost parallel to the center line of the pile body. Furthermore, the long side is fixed to the stake body at a tangential position to the inner periphery of the thick part of the lower end of the stake body, the short side is positioned in the rotational direction of the stake body and bent toward the outer circumference, and both edges are fixed to the stake body. A stake characterized in that it is located on the outer periphery of the thick portion at the lower end.