JPS6219701Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to steel pipe piles that are rotationally press-fitted into small-scale land works.

Driving steel pipe piles with a diesel hammer or the like generates noise and vibration, which has a negative impact on the surrounding environment, so in recent years a method of rotary press-fitting has been proposed and put into practical use in some cases. The purpose of this idea is to propose a small-diameter steel pipe pile that reduces friction with the soil during rotary press-fitting and is easier to erect.

An embodiment of the steel pipe pile according to this invention will be described below with reference to the drawings.

At the tip of the steel pipe pile 1, an L-shaped steel plate piece 2 is attached.
Two digging blades 2 are welded and attached at symmetrical positions with respect to the central axis of the pile. The excavating blade 2 has two thickness surfaces of the L-shaped stepped portion in contact with the outer circumferential surface and the distal end surface of the pile tip, and extends in the direction of the pile tip and in the radial direction of the inner and outer circumferential surfaces, and the tip of the excavating blade extends in the axial direction of the pile as shown in On the other hand, it is arranged tilted in the direction of pile rotation. As shown in Fig. 3, this steel pipe pile 1 has a drive shaft 3 connected to the pile head via a drive shaft cap 4, which is rotated and press-fitted into the soil 5. A mating engagement protrusion 6 is provided in a protruding manner. Note that the inclination angle θ of the excavating blade with respect to the axis is 45° or less.

This invention consists of the above-mentioned structure. This pile has a digging blade attached to its tip that extends in the tip direction and the radial direction of the inner and outer circumferential surfaces, and whose tip is tilted in the direction of rotation. It enables efficient excavation of soil along the ground, reduces friction, and facilitates rotational press-in of piles.Also, since the drive shaft cap is locked with an engaging protrusion and the pile is rotated, it avoids boulders and reduces friction with the soil. It is also possible to pull it up during construction to weaken it, avoiding trouble during pile press-in, and efficiently demonstrating the function of the excavator blade. In addition, the L-shaped steel plate piece is made to protrude in the direction of the tip of the pile and in the inner and outer peripheral directions, and is easy to weld when installed at an angle, and can provide high installation accuracy and installation strength to the excavation blade.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the tip of the steel pipe pile of the example, Figure 2 is a plan view of the excavation blade, Figure 3 is a side view of the steel pipe pile during rotational press-fitting, and Figure 4 shows the inclination of the excavation blade. It is a side view of the tip of a steel pipe pile. 1... Steel pipe pile, 2... Drilling blade, 3... Drive shaft,
4... Drive shaft cap, 5... Soil, 6... Engagement protrusion.

Claims (1)

[Scope of utility model registration request] At the tip of the steel pipe pile, a digging blade consisting of a plurality of L-shaped steel plate pieces that protrudes in the direction of the tip of the pile and in the radial direction of the inner and outer circumferential surfaces is installed at the tip of the L-shaped steel plate piece.
Two thick surfaces are in contact with the pile tip surface and the outer circumferential surface, and the tips are welded with the tips tilted in the pile rotation direction with respect to the pile axis direction. A steel pipe pile for rotary press-fitting, characterized in that an engaging protrusion is welded.