JPH0246502Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial application field) This invention prevents landslides when excavating holes for constructing utility poles in soft ground with spring water, collapsible ground, etc. The present invention relates to a jig for pushing a cylindrical pipe into the soil by uniformly transmitting the pushing force of an earth drill attached to a digging pole construction vehicle to the cylindrical pipe.

(Prior Art) Conventionally, when excavating a hole for a pillar in the ground where there is a landslide as described above, a cylindrical pipe is used to be pushed into the soil in advance by placing a plate on the upper edge of the cylindrical pipe. There is a method of pushing in by hitting this with a hammer or the like, or directly hitting the upper edge of the cylindrical tube with a hammer, or a method using a utility pole erection device using a leading tube.

(Problem that the invention aims to solve) However, the former method has the drawback that the upper edge of the cylindrical tube cannot be struck uniformly, so the cylindrical tube is inclined and penetrates, and the latter method The drawback was that it was limited to leading pipes of various diameters.

The present invention eliminates the above-mentioned drawbacks of the conventional method, and evenly transmits the pushing force of a ground drill in a stopped state to cylindrical pipes of various diameters. This provides a jig that is interposed between the drill and the cylindrical pipe.

(Structure of the invention) Figures 1 and 2 show an embodiment of the invention,
1 is a cylindrical body into which the lower half of the center bit of the earth drill is inserted and receives its pushing force; 2 is a number of holding pieces fixed to the cylindrical body 1 and extending radially at approximately equal angles from the center of the cylindrical body 1; In the illustrated example, a U-shaped cross section is used. 3 is each presser piece 2
A plurality of plate-shaped anti-slip protrusions are provided to protrude downward, and are provided at equal distances from the center of the cylindrical body 1, that is, concentrically with the center of the cylindrical body 1 as the center. . In this embodiment, the anti-slip projections 3 are provided on three concentric circles.

When pushing a cylindrical tube using the jig of the present invention, as shown in FIG. The jig of the present invention is placed on the upper edge of the cylindrical tube 4 so that the In the illustrated example, the diameter of the cylindrical tube 4 used is small, and the upper edge thereof is shown to fit directly onto the outer periphery of the innermost slippage prevention protrusion 3 of each presser piece 2. Next, the center bit 6 of the earth drill 5 of the hole-drilling and pole-erecting vehicle is inserted into the cylindrical body 1, and the earth drill 5 is pushed downward while the rotation is stopped. At that time, earth drill 5
The pressing force is transmitted to the upper edge of the cylindrical tube 4 via the presser pieces 2 extending radially from the cylindrical body 1 at equal angles.
Also, the lateral vibration of the earth drill 5 is absorbed by the cylindrical body 1, and the displacement of the holding piece 2 when pushing the cylindrical tube 4 is absorbed by the displacement prevention plate 3, so that the center of the cylindrical body 1 is always aligned with the cylindrical tube 4. The pushing force of the earth drill 5 can be evenly transmitted to the cylindrical tube 4 by keeping it substantially aligned with the center.

By repeating such a pushing operation using the earth drill 5, the cylindrical pipe 4 is easily pushed into the soil without being tilted.

Even for cylindrical tubes 4 of various diameters, the lateral displacement of the presser piece 2 with respect to the cylindrical tube 4 is prevented by the near-slip prevention protrusion among the plurality of displacement prevention protrusions 3, so that both the cylindrical body 1 and the cylindrical tube 4 are The centers can always be kept substantially aligned, and the cylindrical pipe 4 can be pushed into the soil without tilting.

Note that after the cylindrical pipe has been pushed in, a hole for the pillar erection is drilled using an earth drill 5.

(Effect of the invention) As explained above, the jig of the invention has several anti-slip protrusions equidistant from the center of the cylinder on each of the holding pieces extending radially at equal angles from the cylinder. Because of this, even when used with cylindrical tubes of various diameters, the center of the cylindrical body is always kept approximately aligned with the center of the cylindrical tube, and the pressing force of the earth drill applied to the cylindrical body is absorbed by the holding piece. Since it can be evenly transmitted to the upper edge of the cylindrical pipe through the cylindrical pipe, it can be pushed into the soil without tilting the cylindrical pipe.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a side view of the same, and FIG. 3 is a side view showing the state of use. DESCRIPTION OF SYMBOLS 1... Cylindrical body, 2... Holding piece, 3... Slip prevention protrusion, 4... Cylindrical tube, 5... Earth drill, 6...
...Center bit.

Claims (1)

[Scope of utility model registration request] A cylindrical body into which a center bit of an earth drill attached to a drilling pole construction vehicle can be inserted; a plurality of holding pieces extending radially at equal angles around the cylindrical body; A jig for pushing a cylindrical tube, comprising a plurality of slip-preventing protrusions projecting on at least one concentric circle centered on the center of a cylindrical body.