JPH07173832A - Non-earth moving type rotary force-fit pile - Google Patents

Abstract

PURPOSE:To facilitate the force-fit of a pile by fixing plate-like claws on the front end face so that they are paralleled with a segment of a line on the front end face passing through the rotational center and that they are positioned to the forward side in the rotational direction of the segment of the line. CONSTITUTION:The end opening of a cylindrical pipe body 2 of a pile 1 is blocked with a circular substrate 3, and a spiral wing 5 is adhered to the front end of the pile 1. After that, claws 6 for expanding and softening earth by excavating ground are fixed on the front end face 4 of the pile 1, and the claws 6 are paralleled with a segment of a line on the front end face 4 passing through the rotational center O of the pile 1 and are positioned to the forward side in the rotational direction A of the pile 1 from the segment of the line. After that, in the case the pile 1 is rotated, reaction force F of the claws 6 received from earth acts on the forward side in the rotational direction of the claws 6 in the direction of the arrow A, and earth expanded and softened by the claws 6 is guided in the direction of the arrow C along the forward side in the rotational direction and is moved to the outside from the front end face 4. According to the constitution, the front end resistance of the pile 1 is reduced, and the force-fit of the pile 1 can be facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-discharging type rotary press-fitting pile which is press-fitted while being rotated in the ground.

[0002]

2. Description of the Related Art As a non-discharging type rotary press-fitting pile, it is formed in a cylindrical shape and has a tip end surface which is substantially perpendicular to the axis, and spiral blades are provided at the tip end part and the middle part of the outer peripheral surface. Some are stuck. The upper end of this pile is pivotally attached to the tip of the boom of the crane, and the lower end is supported and fixed on the ground. It is driven by being press-fitted into the ground by a press-fitting type pile driver which is constructed by suspending a motor on the hook of a crane. That is, the pile head of the pile is grasped by a catcher provided in the motor and the pile is arranged in parallel with the tower, and the pile is screwed by rotating the pile around the shaft center by the motor and lowering the motor. It is pressed into the ground. Then, as shown in FIG.
A claw 13 made of a plate material for shaving the ground to soften the soil is fixed to the tip surface 12 of the.

[0003]

In the above-mentioned conventional one, since the claw 13 is fixed so as to be located on the line segment 15 passing through the rotation center O of the pile 11, the claw 13 is removed from the soil. The reaction force F received acts in a direction substantially perpendicular to the front surface 16 of the claw 13 in the rotation direction A. Therefore, although the ground can be shaved by the claws 13 to soften the soil, the softened soil is removed. Tip 12 of pile 11
Therefore, the tip resistance of the pile 13 was large by that much.

In view of this, the present invention eliminates the soil that has been shaved and softened by the nails from the tip end surface of the pile to the outside to reduce the tip resistance of the pile so that the pile can be satisfactorily press-fitted. It is intended to provide a non-discharging type rotary press-fitting pile.

[0005]

The technical means taken by the present invention to achieve the above-mentioned object is that the tip surface 4 is a surface substantially orthogonal to the axial center while being formed in a cylindrical shape. In a soilless rotary press-fit pile that is press-fitted into the ground while being rotated around the center, on the tip surface 4, the line segment B passing through the center of rotation O and parallel to the line segment B on the tip surface 4 and the line segment B It is at a point where the plate-like claw 6 is fixed so as to be located on the front side in the direction A of rotation.

[0006]

The operation will be described with reference to FIG. Pile 1 with arrow A
When rotated in the direction, the plate-like claws 6 fixed to the tip surface 4 of the pile 1 are parallel to the line segment B passing through the rotation center O and the line segment B
Since it is provided on the front side of the pile 1 in the rotation direction A, the reaction force F that the nail 6 receives from the soil is
The direction of rotation A of the pile A acts in the direction of the arrow, and therefore the soil in which the nail 6 has been shaved and softened is guided in the direction of the arrow C and removed outside the tip face 4 of the pile 1. .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings shown in FIGS. Reference numeral 1 is a non-discharging type rotary press-fit pile that is pressed into the ground while being rotated about its axis by a motor. The pile 1 is a pipe pile in which the end opening of the cylindrical pipe body 2 is closed by a circular lid plate 3, and the tip end surface 4 is a surface orthogonal to the axial direction of the pile 1. In addition, a spiral wing 5 is welded to the tip of the pile 1, and the tip 4 has two claws 6 (or 1) for shaving the ground to soften the soil.
One or three or more) are fixed. The claw 6 is made of a rectangular plate material and, as shown in FIG. 1, is parallel to the line segment B on the tip face 4 passing through the rotation center (pile axis) O of the pile 1 and is more than the line segment B. It is provided so as to be located on the front side of the rotation direction A of 1. Therefore, when the pile 1 is rotated, the reaction force F received from the soil by the claw 6 acts in the direction indicated by the arrow on the front surface 7 of the direction A of rotation of the claw 6, and the soil that has been softened by the claw 6 is claw 6. It is guided in the direction of arrow C along the rotation direction A front surface 7 and is removed outward from the tip surface 4 of the pile 1.

[0008]

EFFECTS OF THE INVENTION According to the present invention, the soil-free type is formed in a cylindrical shape, and the end surface 4 is a surface substantially orthogonal to the axis and is pressed into the ground while being rotated around the axis. In the rotary press-fitting pile, the plate-like claw 6 is fixed to the tip surface 4 so as to be located in parallel to the line segment B passing through the rotation center O and on the front side in the rotation direction A of the line segment B. The soil that has been shaved and softened by 6 is removed outside the tip surface 4 of the pile along the front surface of the pawl 6 in the direction of rotation A. Therefore, the tip resistance of the pile is reduced and the press-fitting of the pile is reduced. It will be good.

[Brief description of drawings]

FIG. 1 is a bottom view of a pile.

FIG. 2 is a side view of the lower part of the pile.

FIG. 3 is a bottom view of a pile showing a conventional example.

[Explanation of symbols]

 1 Pile 4 Tip surface 6 Claw A Rotation direction B Line segment O Rotation center

Claims (1)

[Claims] 1. The end surface (4) is formed in a cylindrical shape.
Is a surface that is substantially orthogonal to the axis, and is a discharge-free rotary press-fit pile that is pressed into the ground while being rotated about the axis, and passes through the center of rotation (O) on the tip surface (4). The tip surface
(4) Parallel to the upper line segment (B) and the direction of rotation of the line segment (B)
(A) A non-discharging type rotary press-fitting pile in which a plate-like claw (6) is fixed so as to be located on the front side.