JPH0541773B2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention, when planting utility poles and various types of pillars underground, first prepares a strong foundation at the construction site and then plants the pillars on this foundation. This is related to the foundation of a self-supporting column, which attempts to maintain a solidly planted state with only the column without using branch wires.

B. Prior Art Conventionally, a technique is known in which a vertical hole is previously excavated in the ground using an earth auger, and a casing pipe is inserted into the vertical hole without any modification to form a foundation.

C. Problems to be Solved by the Invention In the basic body of the prior art, the outer diameter of the casing pipe must be smaller than that of the vertical hole to allow the pipe to pass through.

The casing pipe for this utility pole is at least 3
m or more.

Therefore, the space between the casing pipe and the vertical hole must be thoroughly pounded and compacted to fill it with soil, but it is extremely uncertain to pound and compact the space that is more than 3 meters below the ground surface. The open sky will cause utility poles to tilt in the future.

In other words, there was a problem in that it would be extremely difficult or impossible to prevent utility poles from sinking or uprooting with future casing pipes.

It is an object of the present invention to provide a foundation for a self-supporting pole body in which a utility pole embedded in a casing pipe is planted and fixed in a completely stable manner in any direction, up, down, left, or right.

D. Means for Solving the Problems In order to achieve the above object, in the foundation of the self-supporting column of the present invention, the upper end part of the casing pipe having a predetermined length and outer diameter, and the appropriate part from the center part to the lower end. At the same time, four cutting blades are fixed at equal intervals on the outer periphery of the lower part with their lower ends protruding a predetermined length from the lower end surface of the casing pipe, and the upper screw and the lower screw are respectively fixed to the outer circumference of the casing pipe. A locking body having a rotating ring is fixed to a predetermined portion of the holder.

E. Effect When the casing pipe configured as described above is rotated and screwed into a vertical hole whose diameter is smaller than the outer diameter of the casing pipe, the cutting blade at the lower end cuts the side wall of the vertical hole and cuts the notched soil. The casing pipe is deposited at the bottom of the vertical hole, and the casing pipe descends inside the vertical hole, and the lower screw blade is screwed in, thereby collapsing the soil between the vertical hole and the casing pipe, which has been enlarged by the preceding cutting blade. Fill it with.

Then, this filled soil is expanded and compressed by the friction caused by the rotation of the casing pipe.
The succeeding upper stage screw blade is inserted into the vertical hole, and the casing pipe is fixed in the vertical hole.

After planting utility poles, etc. in the casing pipe set in this vertical hole, the inclined surface at the upper end of the vertical hole is filled with concrete and hardened, so that the upper stage screw blade is also screwed into the soil at a predetermined depth. A similar result is obtained, and the utility pole etc. is stably planted in all the vertical and horizontal directions by the casing pipe and the screw blades that are attached to the outer periphery of the casing pipe in two stages and bite into the ground. (3rd
(See Figures and Figures 4) F. Example To explain an example with reference to the drawings, in Figures 1 and 2, a casing pipe 1 having a predetermined length and outer diameter is constructed, and the casing pipe 1 is Upper stage screw blades 2 and lower stage screw blades 3 are respectively fixed to the upper end portion and an appropriate portion extending from the center portion to the lower end. The casing pipe 1
On the outer periphery of the lower end of the casing pipe 1, four cutting blades 4 are inserted at equal intervals to extend a predetermined length of the lower end of the casing pipe 1.
It protrudes from the lower end surface and is fixed.

A channel-shaped locking body 5 having a rotation ring 6 for rotation and twisting in the center is fixed to a predetermined portion within the casing pipe 1.

Figures 3, 4, and 5 show the construction process of the casing pipe. (1) As shown in Figure 3, first, the outer diameter of the casing pipe 1 is placed on the construction site. A vertical hole 7 having a slightly smaller diameter and a depth corresponding to the length of the casing pipe 1 is excavated using an earth auger or the like, and a portion near the ground surface of the vertical hole 7 is excavated in an inclined shape to form an inclined surface 8.

Then, the casing pipe 1 is planted at the lower end of the inclined surface 8 near the ground surface of the vertical hole 7.

(2) When a rotating tool is fitted into the rotating ring 6 in the casing pipe 1 and rotated while pressing using the torque of the arm auger, the cutting blade 4 at the lower end first cuts the casing pipe 1. The side wall of the vertical hole 7 whose diameter is smaller than the outer diameter is cut to create a hole whose diameter is slightly larger than that of the casing pipe 1 by the thickness of the cutting blade 4, and the casing pipe 1 enters the inside of the vertical hole 7. However, due to screwing, the lower stage screw blade 3 comes into contact with the vertical hole 7, and as a result of the screwing, the casing pipe 1 further advances along the vertical hole 7, and finally, as shown in FIG. The installation of the casing pipe 1 is completed with the screw blade 2 biting into the side wall of the vertical hole 7.

(3) Subsequently, gravel is filled up to the part where the bottom of the column 9 is to be placed, liquid rapid hardening cement is injected into this and hardened, and the column 9 is implanted into the casing pipe 1. Concrete is injected and filled between the casing pipe 1 and the column 9, and the concrete is also filled and hardened in the slope between the upper end of the casing pipe 1 and the ground surface. (Fig. 5) Effects of the Invention Since the present invention is configured as described above, the utility pole consists of the casing pipe 1 and the screws provided on the upper and lower sides of the outer circumference of the casing pipe 1 and dug into the ground. The wings 2 and 3 have the effect of being able to be planted and placed in a stable manner in all the vertical and horizontal directions.

[Brief explanation of drawings]

FIG. 1 is a plan view of the foundation of the self-supporting column, FIG. 2 is a side view of the same, and FIGS. 3 to 5 are explanatory diagrams showing the construction process. 1...Casing pipe, 2...Upper stage screw wing, 3...Lower stage screw wing, 4...Cutting blade,
5... Locking body, 6... Rotating ring, 7... Vertical hole, 8...
…Slanted surface, 9…Column.

Claims (1)

[Claims] 1. An upper stage screw wing and a lower stage screw are respectively fixed to the upper end part of the casing pipe having a predetermined length and outer diameter, and an appropriate part from the center part to the lower end, and 4 screws are fixed at equal intervals around the outer circumference of the lower end part.
A cutting blade is fixed with its lower end protruding a predetermined length from the lower end surface of the casing pipe, and a locking body having a rotation ring is fixed to a predetermined portion inside the casing pipe. The foundation of the standing column.