JP2008144428A - Drilling implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drilling implement which can be easily pulled out in the state of placing a clod on a spiral blade, by pressing and compressing the clod placed on the spiral blade, even if the drilling implement is used for relatively-low-viscosity soil such as decomposed granite soil. <P>SOLUTION: This drilling implement 10, in which a spiral body 20 is wound around the lower outer periphery of the base shaft 11, performs drilling work by being pulled up after being rotatively inserted into the ground while rotating the base shaft 11. A push-in plate 40 almost equal in diameter to a drilled hole HL is provided in the upper portion, in the direction of the base shaft 11, of the spiral body 20. When drilling implement 10 is rotatively inserted into the ground, the discharge of soil discharged by the spiral body 20 is regulated by the push-in plate. Thus, the discharged soil is pressed and compressed by the upper portion of the spiral body, and the clod placed on the spiral body 20 is tightened even in the case of the relatively-low-viscosity soil. This enables the drilling implement 10 to be easily pulled out in the state of placing the clod on the spiral body. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a drilling tool for excavating a hole having a desired depth in the ground by inserting and pulling up a spiral while pressing and rotating the spiral.

  Conventionally, as a manual digging tool used for burying a pile, a pole, a support column, or the like, for example, one disclosed in JP-A-11-303118 (Patent Document 1) is known.

  The drilling tool is provided with a handle in a substantially T shape at the upper part of the base shaft, and has a steel spiral blade at the lower portion, and a strong insertion shaft portion below the spiral blade, and a tip of the insertion shaft. Is formed in a protruding shape, and a steel screw part is provided below.

  In the drilling tool, the spiral blades are wound around the lower outer periphery of the base shaft by doubling (720 degrees) and installed so that the inclination angle of the spiral blades is gentle and the interval between them is made of steel. Since the earth cutting blade is provided on the outer periphery, the root of the tree can also be cut out to remove the earth, and the insertion shaft is attached below the spiral blade, and the tip of the insertion shaft is projected, The insertion shaft is provided with a steel lead helix to help it enter the ground.

JP-A-11-303118, page 1, FIG. 1 and FIG.

  However, since the drilling tool described in Patent Document 1 is provided with a cutting blade at the outer peripheral end of the spiral blade and the soil of the insertion portion is placed on the spiral blade and is discharged, When the spiral portion is not sufficiently performed, and when the spiral portion is pulled out from the ground, when used in soil with relatively low viscosity such as pure sand soil, the soil mass pulled out on the spiral blade is sufficiently removed from the spiral. There is a case where the clot cannot be pulled out efficiently without getting on the blade.

  The present invention has been made in view of such circumstances, and by providing a pushing plate above the spiral body in the base axis direction, the drilling tool is used in soil with relatively low viscosity such as pure sand. Even if it does, it aims at providing the drilling tool which can be easily pulled out in the state which put the lump on the spiral blade by pressing and compressing the lump put on the spiral blade.

  The drilling tool according to claim 1 is configured such that an oblique blade is fixed to the lower outer periphery of the base shaft at a predetermined angle in the axial direction of the base shaft, and the base shaft is rotated to be inserted into the ground and lifted up. A drilling tool for performing excavation work, wherein a push plate having a diameter substantially the same as the diameter of the drilling hole is provided above the oblique blade in the axial direction of the base shaft.

  In the drilling tool according to claim 1, when rotating and inserting into the ground, the discharge soil discharged by the skew blades can be controlled to be discharged by the pushing plate, and as a result, Since the discharged soil to be discharged is pressed and compressed on the upper surface of the skew blade, even if the soil is relatively less viscous, the soil mass is placed on the soil blade by tightening the soil block on the skew blade. It can be easily pulled out.

  The drilling tool according to claim 2 is the drilling tool according to claim 1, wherein the skew blade is a spiral blade.

  In the drilling tool according to claim 2, the skew blade may be configured as a spiral blade, and when configured as the spiral blade, when the rotary blade is inserted into the ground, it is smoothly inserted. In addition, the discharged soil can be discharged efficiently, and as a result, the pressed soil can be efficiently compressed.

  A drilling tool according to a third aspect is the drilling tool according to the first aspect, wherein the skew blades are provided discontinuously on the base shaft.

  The drilling tool according to claim 3, wherein the skew blades may be constituted by a plurality of fan-shaped blades or semicircular blades that are discontinuous spiral blades, and are easy to manufacture. In the present invention, the present invention can be applied.

  According to the first aspect of the present invention, the oblique blades are fixed to the lower outer periphery of the base shaft at a predetermined angle in the axial direction of the base shaft, and the base shaft is rotated, inserted into the ground, and then pulled up. A drilling tool for performing excavation work, and a push plate having a diameter substantially the same as the diameter of the drilling hole is provided above the oblique blade in the axial direction of the base shaft. The discharge soil discharged by the skew blades can be controlled by the pushing plate, and as a result, the discharged soil is pressed and compressed on the upper surface of the skew blades and is relatively less viscous. Even if it is soil, it can be easily pulled out in a state in which the soil mass is placed by tightening the soil mass on the skew blade.

  According to a second aspect of the present invention, in the drilling tool according to the first aspect, since the skew blade is constituted by a spiral blade, it is smoothly inserted when rotating and inserting into the ground. In addition, the discharged soil can be discharged efficiently, and as a result, the pressed soil can be efficiently compressed.

  According to a third aspect of the present invention, in the drilling tool according to the first aspect, since the skew blades are provided discontinuously on the base shaft, for example, the skew blades are discontinuous. The present invention can also be applied to the skewed blades that can be manufactured from a plurality of fan-shaped blades or semicircular blades that are spiral blades and that are easy to manufacture.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.

  Fig.1 (a) is a front view of the drilling tool which concerns on this invention, (b) is a side view. 2 is an enlarged view of the main part of FIG. 1A, and FIG. 3 is an enlarged view of the main part of FIG.

  1 to 3, reference numeral 10 denotes a drilling tool according to the present invention, and the tip of a base shaft 11 formed of a metal pipe material is a sharpened portion 12 so as to easily enter the ground, and the base shaft A handle portion 13 formed of a metal pipe material is fixed to the base end of the base plate 11 by welding so as to intersect with the base shaft 11 and have a substantially T-shape as a whole. A rubber grip 14 is put on both ends of the handle portion 13.

  A spiral body 20 (21, 22) that hangs a cutting blade 30 (31, 32, 33) on the outer peripheral edge is provided by welding at the tip of the base shaft 11. The spiral body 20 (21, 22) is composed of two spiral blades 21, 22, a lower spiral blade 21 provided at the tip of the base shaft 11 and an upper spiral blade 22 provided above the spiral blade 21.

  FIG. 4 is a front view showing the spiral body, (a) is a front view of the lower spiral blade, and (b) is a front view of the upper spiral blade. 5 is a cross-sectional view taken along line AA, FIG. 6 is a cross-sectional view taken along line BB, and FIG. 7 is a cross-sectional view taken along line CC.

  As shown in detail in FIGS. 2 to 7, the lower spiral blade 21 is provided so as to wind the base shaft 11 360 degrees below the tip end portion of the base shaft 11, and the upper spiral blade 22. Is a position different from the spiral trajectory of the lower spiral blade 21 above the lower spiral blade 21 and at a position where the lower end 22a of the upper spiral blade 22 is lower than the upper end 21b of the lower spiral blade 21. At the position where the trajectory is drawn, the base shaft 11 is installed so as to be wound 180 degrees.

  As described above, the reason why the spiral body 20 has the double spiral structure (21, 22) will be described later by arranging the lower spiral blade 21 and the upper spiral blade 22 so as to draw different spiral trajectories. Of the cutting blades 30 (31, 32, 33), the cutting blades 31, 33 and the cutting blade 32 can cut the hole peripheral side surface with different spiral trajectories, and most of the hole peripheral side surface can be cut off. Since the hole HL can be cut into a substantially cylindrical shape, the soil lump can be easily pulled out. Furthermore, since the entire spiral body 20 is secured, the soil can be smoothly fed upward. .

  Further, as described above, the upper spiral blade 22 is disposed above the lower spiral blade 21 so that the lower end 22a of the upper spiral blade 22 is lower than the upper end 21b of the lower spiral blade 21. Thus, although the base shaft 11 is wound as a whole by 540 degrees as the entire spiral body 20, the entire length of the spiral body 20 is shortened by the length in which the upper spiral blade 22 is displaced downward. Thus, the resistance force during the rotational insertion of the spiral body 20 is reduced, and the amount of soil mass lifted by the spiral body 20 is reduced to reduce the lifting load.

  Cutting blades 30 (31, 32, 33) are suspended from the outer peripheral ends of the spiral body 20 (21, 22), respectively. FIG. 8 is a longitudinal sectional view of a main part of the spiral body.

  As shown in FIGS. 1 to 8, a cutting blade 31 formed in a substantially fan shape has a bladed surface 31a inclined forward with respect to the rotation direction at the lower end of the outer peripheral edge of the lower spiral blade 21. A similar cutting blade 32 is suspended at a position facing the lower end 21 a of the blade 21, and at a position facing the cutting blade 31, that is, at an intermediate position on the outer periphery of the lower spiral blade 21. Has been established. Further, the cutting blade 33 is suspended directly above the cutting blade 31 on the outer periphery of the upper spiral blade 22, and the cutting blade 31 and the cutting blade 33 are in parallel with each other in the spiral body 20 (21, 22). It arrange | positions so that it may become.

  Further, each of the cutting blades 31, 32, 33 is formed with protruding portions 31b, 32b, 33b that protrude slightly upward (about 10 mm in this embodiment) from the upper surfaces of the spiral blades 21, 22, respectively.

  Since each of the cutting blades 31, 32, 33 is formed so as to be inclined forward in the lower part of the cutting blade with respect to the rotation direction, as described above, when rotating and inserting into the ground, The glass or stone can be pushed up to the upper surface of the spiral blade, and the roots remaining in the soil can be cut. Further, by forming the protruding portions 31b, 32b, 33b, the upper portion is secured by securing an upper welding shell so that welding can be performed from the upper and lower surfaces, and the protruding portions 31b, 32b, 33b allow the holes to be When pulling out the digging tool 10 from the ground, it is possible to effectively embrace the earth lump cut by the cutting blades 31, 32, 33.

  The cutting blades 31, 32, and 33 are made of carbon steel that has been improved in wear resistance and impact resistance by heat treatment, and the bladed surfaces 31a, 32a, and 33a are subjected to blade processing to provide holes. The cutting ability of the peripheral side is improved.

  9 is a DD sectional view showing the pushing plate, FIG. 10 is a central longitudinal sectional view of the pushing plate, and FIG. 11 is a perspective view of the pushing plate.

  As shown in FIG. 1 to FIG. 3 and FIG. 9, the pushing plate 40 is fitted with a truncated conical metal plate having a diameter substantially the same as the diameter of the excavation hole HL at a position above the spiral body 20 in the base shaft 11. It is fixed by welding. The push plate 40 has circular through holes 41 at three locations.

  Therefore, when the drilling tool 10 is rotationally inserted into the ground, the discharge soil discharged by the spiral body 20 can be controlled by the push plate 40, and as a result, the discharged discharge soil is Even soil that is pressed and compressed on the upper surface of the spiral body 20 and has relatively little viscosity can be easily pulled out in a state in which the soil mass is placed by tightening the soil mass on the spiral body.

  The case where the said drilling tool 10 formed as mentioned above is used is demonstrated. 12 to 15 are schematic views showing how to use the drilling tool according to the present embodiment.

  First, as shown in FIG. 12, the sharpened portion 12 of the drilling tool 10 is pierced perpendicularly to the ground surface G. At this time, if the tip of the cutting blade 31 is similarly pushed to the ground and pressed in a manner of drawing a circle with a compass, centering during excavation can be easily performed, and excavation can be performed at an accurate position. it can.

  Next, as shown in FIG. 13, the drilling tool 10 is pressed and rotated, and the side surface of the hole HL is inserted into the ground while being cut by the cutting blades 31, 32 and 33.

  Then, when the pushing plate 40 hits the ground surface G, the drilling tool 10 is prevented from entering the ground, but if the rotation continues further, the drilling tool 10 rotates on the spot. As a result, the clot in the excavation hole HL is carried on the upper surface of the spiral blades 21 and 22 in the discharge direction, but the clot is restricted from being discharged by the pushing plate 40, and as a result. The discharged soil to be discharged is pressed and compressed on the upper surface of the spiral body 20 (21, 22), and the soil mass on the spiral body 20 (21, 22) is tightened.

  Then, as shown in FIG. 15, the earth lump that has been cut and tightened is pulled out while being held on the spiral body 20 while being held by the cutting blade.

  As described above, when excavating using the drilling tool 10 according to the present embodiment, even if the soil is relatively less viscous, the soil mass is placed by tightening the soil mass on the spiral body. It can be easily pulled out in a wet state.

  In addition, although the said drilling tool 10 of this Embodiment comprised the said spiral blades 21 and 22 with two sheets, it is not limited to this, It can comprise with an appropriate number and position. Similarly, the cutting blades 31, 32, and 33 can be arranged at appropriate numbers and positions.

  The spiral blades may be fan blades or semicircular blades, and may be skew blades attached at a predetermined angle with respect to the axial direction of the base shaft 11 (not shown). In this case, the skew blade can be easily manufactured.

(A) is a front view of the drilling tool which concerns on this invention, (b) is a side view. It is a principal part enlarged view of Fig.1 (a). It is a principal part enlarged view of FIG.1 (b). It is a front view which shows a helical body, (a) is a front view of a lower spiral blade, (b) is a front view of an upper spiral blade. It is AA sectional view. It is a BB sectional view. It is CC sectional view taken on the line. It is a principal part longitudinal cross-sectional view of a spiral. It is DD sectional drawing which shows a pushing board. It is a center longitudinal cross-sectional view of a pushing board. It is a perspective view of a pushing board. It is a schematic diagram which shows the usage method of the drilling tool which concerns on this Embodiment. It is a schematic diagram which shows the usage method of the drilling tool which concerns on this Embodiment. It is a schematic diagram which shows the usage method of the drilling tool which concerns on this Embodiment. It is a schematic diagram which shows the usage method of the drilling tool which concerns on this Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Drilling tool 11 Base shaft 20 Spiral body 40 Pushing plate

Claims (3)

A drilling tool that performs excavation work by fixing a slanted blade with a predetermined angle in the axial direction of the base shaft to the lower outer periphery of the base shaft, rotating the base shaft, rotating and inserting it into the ground, and
A drilling tool characterized in that a push plate having a diameter substantially the same as the diameter of a drilling hole is provided above the skew blade in the axial direction of the base shaft.
The drilling tool according to claim 1, wherein the skew blade is a spiral blade.
  The drilling tool according to claim 1, wherein the skew blades are discontinuously provided on the base shaft.

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