JP2016098594A - Drilling agitation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drilling agitation device capable of drilling a square excavation hole in a soft foundation and constructing a square underground pile which is formed by agitating and mixing a sand production and a hardener and solidifying them.SOLUTION: A drilling agitation device comprises: a rotation rod 9; a horizontal drilling part 7 which is formed on the rotation rod 9 and horizontally rotates along with the rotation rod 9; a vertical drilling part 8 which is disposed above the horizontal drilling part 7; and a machine element 21 which endows the vertical drilling part 8 with a rotative force in a vertical direction by transmitting a rotation power of the rotation rod 9. The vertical drilling part 8 is rotatably supported by a protection case 22 which is separated from the rotation of the rotation rod 9.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an excavation and agitation device for excavating the ground, agitating and mixing excavated soil and a hardened material, and creating an underground pile in which the excavated soil is solidified by the hardened material.

  Conventionally, for the purpose of improving soft ground, earth and sand excavated from the ground and hardened materials such as cement are stirred and mixed in the ground, and solidified excavated soil is used as underground piles or underground piles are arranged in rows An excavation stirring device for creating an intermediate wall is known (see Patent Document 1 and Patent Document 2).

  The excavating and stirring apparatus disclosed in Patent Document 1 and Cited Document 2 includes a drilling blade provided at the tip of a hollow shaft and a stirring blade provided slightly above the drilling blade. In addition to excavating the soil by rotating the excavating blade horizontally with the rotation of the excavated earth and sand, and the hardened material such as cement milk discharged from the tip of the hollow shaft in the ground, The excavated earth and sand is solidified with a hardener to create underground piles.

  By the way, in order to improve the soft ground, there is a case where a plurality of underground piles are arranged in a row as described above to create an underground wall for the purpose of strengthening the ground or stopping water. When creating such underground walls, it is desirable to make adjacent underground piles as close as possible so that the gap between them becomes small, and in order to make the gap between them as small as possible It is desirable to form individual underground piles in a square shape and increase the contact area with the adjacent underground piles. However, in the excavation and stirring apparatus disclosed in Patent Document 1 and Patent Document 2 described above, the stirring blade has a structure capable of rotating around the hollow shaft, and the earth and sand and the hardened material are stirred and mixed by the stirring blade. At that time, since the stirring blades are stirred while rotating around the hollow shaft, the shape of the solidified underground pile is circular as well as the shape of the excavation hole.

JP-A-8-13473 Japanese Patent Publication No. 63-38496

  The problem to be solved by the present invention is to excavate a square excavation hole in the ground, and to excavate and stir the excavation and stirring device capable of solidifying the excavated soil and hardened material into a square by stirring and mixing Is to provide.

In order to solve the above-described problems, an excavating and agitating apparatus according to the present invention includes a rotating rod, a horizontal excavating unit that is provided at a tip of the rotating rod and rotates in a horizontal direction together with the rotating rod, and above the horizontal excavating unit. A vertical excavation unit disposed therein, and a mechanical element that transmits the rotation of the rotating rod to apply a rotational force in the vertical direction to the vertical excavation unit, and the vertical excavation unit is separated from the rotation of the rotating rod. It is rotatably supported by the fixed member.
To do.

  In one embodiment of the present invention, the mechanical element includes a pair of main bevel gears fixed to the rotating rod, and a pair of sub bevels that mesh with the main bevel gear and rotate as the main bevel gear rotates. A thrust bearing is provided between at least one of the pair of main bevel gears and the rotating rod.

  In one embodiment of the present invention, the vertical excavation unit includes a plurality of vertical rotary blades and a second excavation blade attached to the plurality of vertical rotary blades, and at least the second excavation blade is the vertical rotation. The blade is attached at a predetermined inclination angle with respect to a vertical plane when the wing rotates in the vertical direction.

  The excavator agitation apparatus according to the present invention includes a mechanical element that transmits the rotation of the rotating rod to apply a rotational force in the vertical direction to the vertical excavating unit, and the vertical excavating unit is separated from the rotation of the rotating rod. Since it is rotatably supported by the fixed member, the vertical excavation part rotates only in the vertical direction without rotating around the rotating rod, so that the square excavation hole and the square underground pile corresponding to this hole shape And can be created.

  Further, in the excavating and agitating apparatus according to the present invention, a bevel gear is used as a mechanical element that transmits the rotation of the rotating rod and applies a vertical rotational force to the vertical excavating portion. Since a thrust bearing is provided between at least one of the bevel gears and the rotating rod, the thrust bearing receives the force acting in the axial direction of the rotating rod during excavation, and the lower main bevel gear is flexible. Since it can move, the rotation trouble by mesh | engagement of the main bevel gear of a bevel-shaped gear and a sub bevel gear can be avoided.

  Further, in the excavation stirring device according to the present invention, the second excavation blade attached to the vertical rotary blade is attached at a predetermined inclination angle with respect to a vertical plane when the vertical rotary blade rotates in the vertical direction. Therefore, by scraping off the inner peripheral wall of the circular hole excavated by the horizontal excavation part so that the inclined second excavating blade is involved, four corners are formed on the circular inner peripheral wall, and four substantially flat wall surfaces A square hole made of can be formed.

It is a general view which shows the use condition of the excavation stirring apparatus which concerns on this invention. It is a front view which shows the principal part of the excavation stirring apparatus which concerns on one Embodiment of this invention. It is a conceptual diagram which shows the power conversion part of the excavation stirring apparatus which concerns on one Embodiment of this invention. It is a perspective view of the principal part of the excavation stirring apparatus which concerns on one Embodiment of this invention. It is explanatory drawing which shows the external line of the excavation hole excavated with the horizontal rotary blade and vertical rotary blade of the excavation stirring apparatus which concerns on one Embodiment of this invention.

  Hereinafter, an excavation stirring apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. As shown in FIG. 1, the excavating and agitating apparatus 1 according to this embodiment has a high column 4 standing vertically at the tip of a base machine 3 that can be moved by a caterpillar 2, and an auger motor 5 slides up and down on the column 4. It is attached as possible. The auger motor 5 is provided with a rod 6 of the excavating and agitating device 1, and a horizontal excavating portion 7 and a vertical excavating portion 8 are provided below the rod 6.

  As shown in FIG. 1, the rod 6 of the excavating and agitating apparatus 1 covers a rotating rod 9 connected to the auger motor 5 via a reduction gear (not shown) and the outer periphery of the rotating rod 9. It consists of a guide rod 10. The guide rod 10 has an upper end fixed to the casing of the auger motor 5, and a lower end near the guide rod 10 is slidably held by a holder 11 for shaking that extends from the support column 4. Is disconnected. As shown in FIG. 2, a hollow portion 12 is formed throughout the inside of the rotating rod 9, and a soil hardening material such as cement milk is supplied to the excavation hole through the hollow portion 12. .

  A horizontal excavation section 7 is provided at the lower end of the rod 6. As shown in FIGS. 2 and 4, the horizontal excavation unit 7 includes a pair of horizontal rotating blades 13 that rotate in the horizontal direction at the tip of the rotating rod 9, and a longitudinal direction of the horizontal rotating blades 13. And a plurality of first excavating blades 14 to be attached. The horizontal rotary wing 13 has ribs 13b protruding from the lower surface of an elongated flat plate 13a, and a base portion thereof is fixed to a handle portion 13c serving as a rotation center.

  From the handle portion 13c, a pair of horizontal rotor blades 13 extend horizontally in two opposing directions, and the three first excavating blades 14 are detachably mounted on the ribs 13b of the horizontal rotor blades 13 respectively. Has been. Each of the first excavating blades 14 has a flat blade 14 a with a sharp edge at an acute angle, and the flat blade 14 a is mounted so as to be parallel to the longitudinal direction of the horizontal rotary blade 13. The first excavation blades 14 rotate together with the horizontal rotation of the horizontal rotary blade 13 and excavate the bottom surface of the excavation hole into a circular shape by the flat blade 14a. In this embodiment, the case where the three first excavating blades 14 are mounted on the horizontal rotary blade 13 is described, but the number of the first excavating blades 14 is not limited to three, Since the length of the horizontal rotary blade 13 also changes according to the size of the excavation hole, the number of the first excavation blades 14 also changes accordingly.

  A vertical excavation unit 8 is disposed slightly above the horizontal excavation unit 7. As shown in FIGS. 2 and 4, the vertical excavation section 8 is disposed on both the left and right sides with the rod 6 interposed therebetween, and a vertical rotary blade 15 that rotates in the vertical direction, and a longitudinal direction of the vertical rotary blade 15. And a plurality of second excavating blades 16 attached along. The vertical rotary blade 15 has four elongated rectangular flat plates 15b extending in a cross shape from the handle portion 15a serving as a rotation center, and one long side 15c of the flat plate 15b (in the direction in which the vertical rotary blade rotates). Three second excavation blades 16 are detachably mounted on the front side. As shown in FIG. 2, the vertical rotary blade 15 is disposed substantially above the tip portion of the horizontal rotary blade 13.

  Each of the second excavating blades 16 has a flat blade 16a with a sharp edge sharpened like the first excavating blade 14, but unlike the mounting of the first excavating blade 14, the flat cutting blade 16a. Are mounted so as to be orthogonal to the longitudinal direction of the vertical rotary blade 15. Therefore, the side surface of the hole excavated by the horizontal excavation unit 7 is excavated linearly and flatly by the flat blade 16a of the second excavation blade 16 by rotating together with the vertical rotation of the vertical rotary blade 15. can do.

  Furthermore, in this embodiment, with respect to the vertical plane 17 when the vertical rotary blades 15 rotate in the vertical direction, the four vertical rotary blades 15 are alternately inclined at a predetermined angle inward and outward with respect to the handle. It is attached to the part 15a. That is, as shown in FIG. 4, of the four vertical rotor blades 15, one opposing pair of vertical rotor blades 15 d is inclined inward with respect to the rotation direction, and the other pair of opposing vertical rotor blades 15e is inclined outward. Further, in this embodiment, since the second excavating blade 16 is mounted on the flat plate 15b of the vertical rotary blade 15 so as to extend straight, the second excavating blade 16 also has the same angle as the vertical rotary blade 15 in the plane. It will be inclined with respect to 17. In this way, the second excavation blade 16 is attached in an inclined state to the inside and the outside with respect to the plane 17, so that the square excavation hole can be dug more reliably.

  In this embodiment, since the second excavation blade 16 is mounted on the flat plate 15b of the vertical rotary blade 15 in a state of extending straight, the vertical rotary blade 15 and the second excavation blade 16 have the same inclination angle. However, the vertical rotary blade 15 may be attached to the handle portion 15 a so as to be parallel to the plane 17, and at least only the second excavation blade 16 may be inclined with respect to the plane 17. Further, the number of the second excavation blades 16 attached to one vertical rotary blade 15 is not limited to three as in the case of the first excavation blade 14.

  In the vicinity of the vertical excavation unit 8, a power conversion unit 20 is provided that transmits the rotation of the rotating rod 9 in the horizontal direction to the rotation in the vertical direction to apply a vertical rotational force to the vertical excavation unit 8. ing. The power conversion unit 20 includes a mechanical element 21 for transmitting the power and a protective case 22 that covers the mechanical element 21. In this embodiment, a bevel gear is used as the mechanical element 21. As shown in FIGS. 2 and 3, the bevel gear is a pair of upper and lower main bevel gears 23 and 24 attached to the rotating rod 9 and meshes with the main bevel gears 23 and 24 to rotate the main bevel gear. And a pair of left and right bevel gears 25 and 26 that rotate with the rotation. The pair of main bevel gears 23 and 24 are attached to the rotating rod 9 and rotate integrally with the rotating rod 9. In this embodiment, in particular, the upper main bevel gear 23 is fixed to the rotating rod 9, while the lower side The main bevel gear 24 is provided with an oil impregnated bearing 27 a and a thrust bearing 28 between the rotating rod 9 and the rim of the rotating rod 9. Therefore, the thrust acting on the axial direction of the rotating rod 9 during excavation is received by the thrust bearing 28 and the lower main bevel gear 24 can move flexibly, so that the main bevel gears 23 and 24 and the bevel gears 25 and 26 of the bevel gears can be moved. Rotation troubles due to meshing can be avoided. Note that the same effect can be obtained even if this thrust bearing mechanism is provided on the upper main gear 23 side.

  On the other hand, a pair of secondary bevel gears 25, 26 disposed on the left and right sides of the pair of main bevel gears 23, 24 are disposed so as to mesh with the main bevel gears 23, 24, and The rotating shaft 29 is integrally fixed. As shown in FIG. 3, the rotary shaft 29 is rotatably supported by the protective case 22 of the power conversion unit 20 via a radial bearing 30. An oil-impregnated bearing 27b and a center collar 31 similar to those described above are disposed between the tip of the rotating shaft 29 and the rotating rod 9, and between the center collar 31 and the tip of the rotating shaft 29. A radial bearing 32 is arranged to ensure smooth rotation of the rotary shaft 29.

  As shown in FIGS. 2 to 4, the protective case 22 that covers the bevel-shaped gear has a cylindrical shape with a substantially square cross-section, and the mounting flange 35 at the upper end is the mounting flange 36 of the guide rod 10. By being fixed to the guide rod 10 with the bolt 37, it is fixed integrally. Further, as shown in FIG. 2, the lower part 22a of the protective case 22 is formed in a slightly tapered shape, and leakage of the oil filled in the protective case 22 by the oil seal mounted between the rotating rod 9 Is preventing. Further, an arm portion 38 for supporting the rotating shaft 29 of the vertical rotary blade 15 protrudes left and right at the central portion of the protective case 22. As described above, the arm portion 38 incorporates the radial bearing 30 that rotatably supports the rotating shaft 29, and the insertion hole 39 of the rotating shaft 29 is provided at the tip.

  Next, the operation of the excavating and agitating apparatus 1 having the above configuration will be described. After the excavating and stirring apparatus 1 is carried to the excavation site by the base machine 3 and set, the rotating rod 9 is rotated by driving the auger motor 5. The rotation of the rotary rod 9 causes the horizontal rotary blades 13 of the horizontal excavation section 7 to rotate in the horizontal direction, and the soft ground is excavated by the first excavation blades 14 attached to the horizontal rotary blades 13. Also, the upper main bevel gear 23 of the bevel gear fixed to the rotating rod 9 and the lower main bevel gear 24 supported by the oil retaining bearing 27a on the rotating rod 9 rotate together with the rotating rod 9, and the left and right The rotational force is transmitted to the follower gears 25 and 26. The rotating shaft 29 supported by the protective case 22 is rotated by the rotation of the bevel gears 25 and 26, and the vertical rotary blade 15 of the vertical excavation unit 8 attached to the tip of the rotating shaft 29 is rotated in the vertical direction. At this time, the left and right vertical rotor blades 15 rotate in opposite directions. In addition, since the rotating shaft 29 of the secondary bevel gears 25 and 26 is rotatably supported by the protective case 22, the secondary bevel gears 25 and 26 rotate in a fixed position without revolving around the primary bevel gears 23 and 24. . Therefore, the vertical rotary blade 15 only rotates in the vertical direction and does not rotate horizontally around the rod 6.

  The second excavation blade 16 mounted on the vertical rotary blade 15 has an inner peripheral wall of a circular hole excavated by the first excavation blade 14 of the horizontal rotary blade 13 as the vertical rotary blade 15 rotates in the vertical direction. The excavation is done by scraping off. FIG. 5 is a schematic diagram showing the outer shape of the circular hole 40 excavated by the first excavating blade 14 and the outer shape of the square hole 41 excavated by the second excavating blade 16. First, the first excavation blade 14 excavates the circular hole 40 in the ground to a predetermined depth. At this time, the left and right vertical rotor blades 15 rotate in the vertical direction, and the left and right inner peripheral walls of the circular hole 40 are digged away, so that substantially flat side walls 42a, 42b, 42c, and 42d are formed on all four surfaces. A square hole 41 can be formed. Of the four side walls, only the two opposite side walls 42a and 42b are directly scraped by the second excavating blade 16 of the vertical rotary blade 15, and the remaining two opposite side walls 42c and 42d are not directly scraped. As described above, since the second excavating blades 16 are alternately inclined to the outside and the inside, the second excavating blade 16b attached to the front end portion of the vertical rotary blade 15 is inclined to the inside. Four corner portions 44 are formed on the inner peripheral wall of the circular hole 40 by scraping the second excavating blade 16c so as to wind the four wall soils 43 on the inner peripheral wall of the circular hole 40 facing each other. As a result, not only the side walls 42a and 42b directly excavated by the vertical rotary blades 15, but also the side walls 42c and 42d on the side not directly excavated by the vertical rotary blades 15 become substantially flat wall surfaces. A square hole 41 having four flat side walls 42a, 42b, 42c, 42d will be formed.

  After excavating the square hole 41 to a predetermined depth by the horizontal excavation unit 7 and the vertical excavation unit 8 as described above, the auger motor 5 is slid upward along the support column 4. At this time, by maintaining the rotation of the rotating rod 9 as it is, the horizontal rotating blade 13 and the vertical rotating blade 15 can be pulled up while rotating. In conjunction with this pulling operation, cement milk as a hardener is supplied through the hollow portion 12 of the rotating rod 9. In the excavation hole, the cement milk supplied from the discharge port 9a provided at the tip of the rotary rod 9 and the excavated earth and sand are stirred and mixed in the excavation hole and solidified to form a square underground pile. The agitation and mixing of cement milk and earth and sand is performed by the horizontal rotary blade 13 of the horizontal excavation unit 7 and the vertical rotary blade 15 of the vertical excavation unit 8. In this embodiment, the flat plate 15b of the vertical rotary blade 15 is Since the vertical rotary blade 15 is inclined with respect to the vertical plane 17 at the time of rotation, the agitation and mixing of the cement milk and the excavated earth and sand is more sufficiently performed while the vertical rotary blade 15 rotates. When it rises, it is solidified while adjusting the shape of the side walls 42a, 42b, 42c, 42d of the excavation hole by the inclined flat plate 15b, and as a result, a square pillar underground pile is created.

  While preferred embodiments of the invention have been described above, it should be appreciated that the invention is not limited to these embodiments and that various modifications and changes can be made to these embodiments.

DESCRIPTION OF SYMBOLS 1 Excavator 2 Caterpillar 3 Base machine 4 Strut 5 Auger motor 6 Rod 7 Horizontal excavation part 8 Vertical excavation part 9 Rotating rod 9a Discharge port 10 Guide rod 11 Holder 12 Hollow part 13 Horizontal rotary blade 13a Flat plate 13b Rib 13c Handle part 14 DESCRIPTION OF SYMBOLS 1 Excavation blade 14a Flat blade 15 Vertical rotary blade 15a Handle part 15b Flat plate 15c Long side 16 2nd excavation blade 16a Plane blade 16b Outer 16c Inner 17 Vertical plane 20 Power conversion part 21 Machine element 22 Protective case 22a Lower part 23,24 Main Bevel gears 25, 26 Secondary bevel gears 27a, 27b Oil-impregnated bearings 28 Thrust bearings 29 Rotating shafts 30, 32 Radial bearings 31 Center collars 35, 36 Mounting flanges 37 Bolts 38 Arms 39 Insertion holes 40 Circular holes 41 Square holes 42 Side walls 43 Wall soil 44 Part

Claims (8)

A rotating rod;
A horizontal excavation unit provided at a tip of the rotating rod and rotating in a horizontal direction together with the rotating rod;
A vertical excavation unit disposed above the horizontal excavation unit;
A mechanical element that transmits the rotation of the rotating rod to apply a rotational force in the vertical direction to the vertical excavation unit,
The excavation stirring device in which the vertical excavation part is rotatably supported by a fixing member separated from the rotation of the rotating rod.   The excavation and agitation device according to claim 1, wherein the fixing member includes a protective cover of a mechanical element connected to a guide rod that covers an outer periphery of the rotating rod. The mechanical element comprises a bevel gear comprising a main bevel gear fixed to the rotating rod, and a secondary bevel gear that meshes with the main bevel gear and rotates as the main bevel gear rotates.
The excavation and agitation device according to claim 1 or 2, wherein a rotating shaft of the bevel gear is rotatably supported by the fixing member and is connected to the vertical excavation unit.   The bevel gear includes a pair of main bevel gears arranged vertically so as to face each other, and a pair of left and right sub bevel gears arranged between the pair of main bevel gears. The excavation stirring apparatus according to claim 3, wherein a thrust bearing is provided between at least one main bevel gear and the rotating rod.   The excavation and agitation device according to claim 1, wherein a hollow portion is provided inside the rotating rod, and a discharge port for a hardened material supplied through the hollow portion is provided at a tip portion of the rotating rod.   The vertical excavation part includes a plurality of vertical rotary blades and a second excavation blade attached to the plurality of vertical rotary blades, and at least the second excavation blade is vertical when the vertical rotary blade rotates in the vertical direction. The excavation and agitation device according to claim 1, wherein the excavation and agitation device is attached at a predetermined inclination angle with respect to a flat surface.   The second excavating blades to which the plurality of vertical rotary blades are attached are adjacent vertical rotary blades, and are attached to one vertical rotary blade at an inclination angle outward with respect to the vertical plane. The excavation and agitation device according to claim 6, wherein the excavation and agitation device is attached to the vertical plane with an inward inclination angle. The vertical excavation part includes a plurality of flat plate-like vertical rotary blades and a second excavation blade attached to the flat plate-like vertical rotary blades, and the plurality of flat plate-like vertical rotary blades and second excavation blades The excavation and agitation device according to claim 1, wherein the vertical rotary blade is attached at a predetermined inclination angle with respect to a vertical plane when the vertical rotary blade rotates in the vertical direction.

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