JP2811045B2 - Support pile for soft ground - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supporting pile for supporting a foundation of a building on a soft ground having no supporting ground and preventing settlement.

[0002]

2. Description of the Related Art A supporting pile in a soft ground without a supporting ground receives a load of a building due to a frictional resistance between the ground around the pile and the pile, and prevents the settlement of the building.

Conventionally, there are various types of support piles for soft ground which increase the support force by increasing the frictional resistance between the ground and the pile. Such support piles include, for example, spiral blades on the outer periphery. Is formed into a screw shape, and is rotationally pressed into the ground.

In this type of support pile, for example, the arm is tilted down while rotating the support pile by engaging a rotary shaft of a rotary press-fitting device provided with a reduction motor at the tip of an arm of a column car and engaging the upper end of the support pile. It is pressurized downward and rotationally pressed into the ground.

[0005]

In the conventional supporting pile described above, if there are obstacles such as asphalt and concrete in the ground, the obstacles hit the blades and hinder the rotary press-fitting of the pile. In order to rotationally press-fit the support pile, the pressure and rotational torque of the rotary press-fitting device must be increased.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a support pile for soft ground according to the present invention is provided with an engaging portion at an upper end for connecting to a rotary shaft of a rotary press-fitting device. In the support pile that is rotationally pressed into the ground by the sinking, the right and left outer sides of the pile body made of steel pipe are inclined downward in the direction of rotating the pile, and the pile has a drilling edge at the tip edge in the rotation direction of the pile. A plurality of pairs of left and right blades for prevention are provided at different levels.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific examples of a support pile according to the present invention will be described below with reference to FIGS.
It will be described in detail based on. Reference numeral 1 in the figure denotes a pile body made of a steel pipe having an outer diameter of 139.8 to 500 mm and a length of about 2.5 to 5.0 m, for example. The left and right prevention blades 2a and 2b and 2c and 2d are provided in pairs, and the blades 2a and 2b and 2c and 2d are vertically shifted by, for example, about 150 to 300 mm.

The blades 2a, 2b, 2c and 2d are made of a steel plate having a thickness of, for example, about 10 to 19 mm. As shown in FIG. 4, an elliptical hole formed concentrically with the outer periphery at the center of the ellipse is cut in half in the major axis direction. The inner peripheral edges 3a, 3b, 3c, 3d of the respective blades are welded to the outer periphery of the pile main body 1.

The blades 2a, 2b, 2c and 2d are provided with a downward slope in the rotation direction of the pile when the pile is press-fitted, and the blade itself is formed in a semi-elliptical shape. However, as shown in FIG. 3, in the plan view of the support pile, the anti-sinking plate has a semicircular shape concentric with the pile main body 1 due to its inclination, and has an outer diameter of, for example, about 300 to 400 mm.

It is preferable that the mounting angle of the blades 2a, 2b, 2c, 2d is set to 30 ° or less with respect to a horizontal plane, and the mounting angle is determined by the hardness (N value) of the ground. For example, if the N value is small, the mounting angle is reduced to increase the frictional resistance of the blade. On the other hand, if the N value is large, the mounting angle is increased to facilitate the rotary press-fitting of the support pile.

In addition, the excavation blades 4a, 4b, 4c, and 4c are provided at the leading edges of the piles 2a, 2b, 2c, and 2d in the rotational press-fitting direction, that is, at the lower edges of the settlement preventing plates.
4d is provided so that when the pile is rotationally press-fitted, these blades push the blades into the ground while pushing out obstacles in the ground.

On the outer periphery of the upper end of the pile body 1, there are provided pieces 5, 5, which are engaging portions with a rotary press-fitting device. When the pile is rotary-pressed, the rotary shaft of the rotary press-fitting device is engaged with this piece. The support pile is rotated.

Next, a method of using the support pile according to the present invention is shown in FIG.
It will be described based on. First, an expanding material 6 such as urethane foam is attached to the outer periphery of the pile body 1 with an adhesive, and a rotating shaft of a rotary press-fitting device is attached to an upper end of the pile.

This rotary press-fitting device is constituted by, for example, a speed reduction motor 8 attached to the tip of an arm 7 of a pole carriage. 5, the pile is lowered while being rotated, and a load is applied to the pile, whereby the pile is vertically rotationally pressed into the ground 11.

At this time, the blade 4 provided at the leading edge of each blade
a, 4b, 4c and 4d are cut into the ground, and if there are obstacles such as asphalt or concrete in the ground, they can be pushed or cut and the blades can be cut into the ground. Are not hindered by these obstacles.

After the pile is press-fitted, a ground hardening agent is injected into the expansion material 6 to infiltrate it, thereby filling the cavity formed around the pile, and increasing the N value of the surrounding ground to increase the support capacity of the pile. .

[0017]

Since the support pile according to the present invention has the above-described structure, the following effects can be obtained. Blades with a downward slope in the rotation direction of the pile are provided on the outer periphery of the pile body. You can get enough power.

An excavating blade is provided at the leading edge of the pile in the rotation direction of the blade, and the excavating blade cuts into the ground or pushes an obstacle such as asphalt or concrete flakes in the ground. Since the blade is cut into the ground and cut into the ground, the pile is smoothly pressed into the ground even when there is an obstacle in the ground, and it is not necessary to increase the pressing force and the rotating torque of the rotary press-fitting device.

Further, since the pile is made of a steel pipe and has a simple structure in which blades for preventing settlement are welded to the outer periphery, the mounting angle of the blades can be easily set according to the hardness of the ground. Since only one pair is required, the number of blades can be reduced, and the blade can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a front view of a support pile according to the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a plan view of the above.

FIG. 4 is a plan view of a blade.

FIG. 5 is a sectional view showing a use state of the support pile according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pile main body 2a, 2b, 2c, 2d Blade 3a, 3b, 3c, 3d Inner peripheral edge 4a, 4b, 4c, 4d Blade 5 Piece 6 Expanding material 7 Arm 8 Deceleration motor 9 Rotary shaft 10 Claw 11 Ground

Claims (1)

(57) [Claims] 1. A supporting pile which is provided at an upper end thereof with an engaging portion for connecting to a rotating shaft of a rotary press-fitting device, and which is rotatably pressed into the ground by the rotary press-fitting device. A support for soft ground which is provided with a plurality of pairs of left and right pairs of blades for preventing settlement, each of which is provided with an excavating blade at the tip of the pile in the rotating direction and is provided with a downward slope toward the rotating direction. Pile.