JP5479716B2 - Pile hole drilling head - Google Patents

Description

  The present invention relates to a pile hole excavation head that can be excavated with two kinds of excavation diameters, such as a shaft excavation of a pile hole and an expanded bottom excavation, by attaching an excavation arm to the head body so as to be swingable.

  Conventionally, a pile hole excavation head has been proposed in which excavation arms having excavation blades at the tips are swingably provided on both side surfaces of the head body (Patent Document 1). In this pile hole excavation head, the excavation arm swings to one side with a small swing angle by the forward rotation of the pile hole excavation head, hits the first stopper, excavates the shaft part of the pile hole, and reversely rotates the pile hole excavation head As a result, the excavating arm swings to the other side at a large swing angle, hitting the second stopper and excavating the bottom portion.

This excavation head can increase the ratio of shaft excavation diameter (small-diameter excavation) and bottom-extended excavation (large-diameter excavation). The excavation diameter could be adjusted easily just by adjusting the swing angle by adjusting.
JP-A-2005-307496

  In the prior art, it was a useful pile hole excavation head as described above, but when switching from small diameter excavation to large diameter excavation, it is necessary to change the rotation of the excavation head from normal rotation to reverse rotation, In some cases, it was required to switch without reverse rotation in relation to earth removal.

  In addition, in order to switch the swing angle without reversing, it is necessary to provide two stoppers on one swing side, and a complicated mechanism is required for the operation and release of the stopper, which has been implemented. There wasn't.

  However, the present invention solves the above problems by using one stopper with which the rocking excavating arm comes into contact and a rocking spacer interposed between the stopper and the rocking arm.

That is, the present invention attaches to the both sides of the head body having a connecting portion with the excavating rod, a horizontal axis and an excavating arm provided with an excavating blade at the tip so as to be swingable.
The drilling arm is in the neutral position when the drilling rod does not rotate;
A pile hole excavation head that can swing the excavation arm to one side by forward rotation of the excavation rod is configured as follows.
(1) The excavation arm can take a large swinging position to one side by swinging to the one side, and a large-diameter stopper for holding the excavation arm at the large swinging position on the head body. Provide.
(2) The excavation arm and / or the head main body is provided with a spacer that can be detachably disposed between the large-diameter stopper and the excavation arm by swinging the excavation arm to the one side.
(3) When the spacer is in a detached state, the excavation arm comes into contact with the large-diameter stopper and large-diameter excavation can be performed at a large swing position.
(4) When the spacer is in a worn state, the excavation arm comes into contact with the spacer and can excavate a small diameter at a small swing position.

Moreover, in the above, the pile hole excavation head is characterized in that the spacer is configured as follows.
(1) The head body is provided with a rotation axis parallel to the swing axis at the “position of the large diameter stopper” or “position close to the large diameter stopper”.
(2) A spacer is attached so as to be rotatable around the rotation axis.

  The invention is an excavation head in which an excavating arm is swingably attached to a head body, and a large-diameter stopper for restricting the maximum excavation arm is provided, and a spacer is detachably provided between the large-diameter stopper and the excavating arm. Since it is attached, the excavation arm can excavate a small-diameter pile hole with a small swing while the spacer is attached, and the excavation arm can excavate a large-diameter pile hole with a large excavation when the spacer is detached. Therefore, there is an effect that a pile hole having two large and small diameters can be excavated without rotating in reverse by rotating to one side of the excavating rod.

  Therefore, even when excavating with different diameters, it is not necessary to reversely rotate the excavating rod, so the structure of the pile driving machine can be simplified, and the work for the ground operator to align the core of the rod is simplified. Since the excavation head does not need to correspond to the reverse rotation, the structure of the excavation head can be simplified.

  In addition, when a drilling rod provided with a spiral for soil removal is used, soil removal can be performed during large-diameter excavation as well as during small-diameter excavation, so that the soil disposal efficiency can be increased.

  In addition, when the pile hole excavation head has a structure in which the excavation arm can be swung to the other side by reverse rotation of the excavation rod, if the third swing state is set by the swing of the other side, Combined with excavation of two diameters by swinging, there is an effect that a single excavation head can excavate pile holes with a total of three diameters.

(1) The excavation head 50 includes excavation arms 15 and 15 provided with excavation blades 24 and 24 at the tips on the first side surfaces 3 and 3 of the head body 1 having a connection shaft portion (connection portion) 5 with the excavation rod 52. Are configured to be swingable (FIG. 1A). The drilling head 50 is
-When the excavation rod 52 does not rotate, the excavation arm 15 is in the state of hanging down, takes the neutral position,
When the excavation rod 52 rotates forward, the excavation arm 15 can swing to one side, and the excavation arm 15 can swing to the other side by reverse rotation of the excavation rod 52.

  The excavating arm 15 can take a large swinging position by swinging to one side, and one side surface 17 of the excavating arm 15 contacts the head main body 1 at the large swinging position, and this swinging position is set. A first large-diameter stopper 43 that can be held is provided. In this state, a second large-diameter stopper 44 that can contact the second control convex portion 29 provided at the upper end of the excavating arm 15 is provided.

A swing spacer (spacer) 30 that is rotatable by a rotary shaft 37 is attached to the head body 1. The rotating shaft 37 (reference position) is provided outside “between the position of the one side surface 17 of the excavation arm 15 at the neutral position and the position of the one side surface 17 of the excavation arm 15 at the large swing position”. The swing spacer 30 is
-In the first position, it can be interposed between the excavating arm 15 and the first large diameter stopper 43 (wearing state),
-Excluded between the excavating arm 15 and the first large diameter stopper 43 at the second position (disengaged state)
be able to.

(2) The excavation arm 15 of the excavation head 50 hangs downward without rotating the excavation rod 52, and the tip of the swing spacer 30 is engaged with the first control convex portion 28 of the excavation arm 15. The position of the oscillating spacer 30 can be maintained (FIGS. 1A, 2, and 3. Neutral state). At this time, the distance L ₁ is from the rotation shaft 37 to the one side surface 17 of the excavating arm 15.

(3) When the excavating rod 52 is rotated forward, the excavating arm 15 is swung in the direction of the arrow 53, and one side surface 17 of the excavating arm 15 rotates the rocking spacer 30, and is interposed between one large diameter stopper 43 (mounted state), can be drilled Kuiana shaft portion 60 of diameter _{D 1} (FIG. 1 (b), the 4, 5). At this time, the distance L ₂ from the rotary shaft 37 to the one side surface 17 of the excavating arm 15 is obtained (L ₂ <L ₁ ).

(4) Once the excavation rod 52 stops rotating, the oscillating spacer rotates by its own weight and is excluded from between the side surface 17 of the excavation arm 15 and the first large diameter stopper 43 (disengaged state). . When forward rotation again drill rod 52, drilling arm 15 swings in the arrowed 53 direction, the one side surface 17 of the excavating arm 15 in contact with the first large-diameter stopper 43, the drilling head 50, the diameter D ₂ 1 (c), and the second control convex portion 29 of the excavating arm 15 contacts the second large diameter stopper 44.

  Embodiments of the present invention will be described with reference to the drawings.

[1] Configuration of the excavation head 50

(1) Head The main body 1 is connected to the upper end 2a of the square columnar base 2 with a connecting shaft portion 5 connected to the excavation rod 52 so that the axes coincide with each other. A bulging portion 6 is formed. The four side surfaces of the base 2 are defined as first side surfaces 3 and 3 parallel to each other and second side surfaces 4 and 4 parallel to each other. In the bulging portion 6, the surfaces that are continuous with the first side surfaces 3 and 3 of the base portion 2 are first side surfaces 7 and 7, are continuous with the second side surfaces 4 and 4 of the base portion 2, and are adjacent to the first side surface (opposite) The side surface is the second side surface. That is, the second side surfaces 8 and 8 are located in the bulging direction of the bulging portion 6. Therefore, the 1st side surfaces 7 and 7 of the bulging part 6 become a flat surface, and the bulging part 6 bulges in a horizontal direction, and is formed so that the width | variety of a flat surface may become large. Further, the lower surface 6b of the bulging portion 6 is formed in an arc along the swinging trajectory of the excavating arms 15 and 15, and the fixed excavating blades 10 and 10 are attached with the tips facing downward.

  The base 2 and the bulging portion 6 are set to dimensions such that the first side surfaces 3 and 3 and the first side surfaces 7 and 7 approach each other downward (the width of the second side surfaces 4 and 8 decreases). It is.

(2) Head The horizontal shafts 12 and 12 protrude from the first side surfaces 3 and 3 of the base 2 of the main body 1. The horizontal shaft 12 can be either an integral shaft or a divided shaft as long as the first side surfaces 3 and 3 have the same axis. The base end portion 20 of the excavating arm 15 is swingably attached to the horizontal shafts 12 and 12. Further, since the horizontal shaft 12 only needs to be an axis that can turn the excavating arm 15, the horizontal shaft 12 may be provided on the excavating arm 15 and a bearing may be provided on the head body 1 (not shown).

(3) The excavation arm 15 has a surface on the head body 1 side as an inner surface 16a and a side opposite to the inner surface 16a as an outer surface 16.

  The base end portion 20 of the excavating arm 15 is formed with a large diameter around the horizontal axis 12, the intermediate portion 21 has a small width, and a wide end portion 22 is formed. Further, both the excavating arms 15 and 15 are formed so that the inner surfaces 16a and 16a of the base end portions 20 and 20 are parallel to each other, and the intermediate portions 21 and 21 are directed downward so that the inner surface 16a and the inner surface 16a approach each other. The outer surface 16 is bent so that it approaches. Therefore, the lower end of the intermediate portion 21 is formed in the closest shape, and the tip portions 22 and 22 are formed so that the inner surface 16a and the inner surface 16a move away from each other and the outer surface 16 and the outer surface 16 move away from each other.

  Accordingly, the distal end portions 22 of the excavation arms 15 and 15 are formed so as to open outward, and the excavation blades 24 and 24 extend outward toward the lower end of the excavation arms 15 and 15 so as to be continuous in the opening direction. 24 is projected.

  Further, a surface adjacent to the inner surface 16 a and the outer surface 16 of the excavating arms 15, 15 (a surface in the same direction as the second side surface 4 of the base 2) is defined as one side surface 17, and the other side is defined as the other side surface 18. One side surface 17 is a side surface facing the front surface when swinging in the forward rotation, and the other side surface 18 is a side surface facing the rear surface side when swinging in the forward rotation.

  A semicircular protective protruding plate 25 is provided at one end 17 of the excavating arm 15 so as to protect the excavating blade 24 and stir the excavated soil. In addition, the first control convex portion 28 is projected from the intermediate portion 21 on one side surface 17. Further, a second control convex portion 29 is provided on the upper end of the excavating arm 15 so as to project upward.

(4) The base 2 of the head main body 1 and the first side surfaces 3 and 7 of the bulging portion 6 are formed in a shape substantially along the swing locus of the inner surface 16a of the excavating arm 15 when the excavating arm 15 swings. Has been.

  Further, when the excavation rod 52 is rotated forward, the excavation arm 15 is swung to one side (in the direction of arrow 53), but the first large-diameter stopper 43 that restricts the maximum swing of the one side is provided with the head main body 1. The second side 4 is fixed. The first large-diameter stopper 26 abuts against one side surface 17 of the excavating arm 15 at the large-diameter excavation position and restricts further swinging of the excavating arm 15. The first large diameter stopper 43 protrudes outward (excavation arm 15 side) from the first side surface 3. In addition, a second large-diameter stopper 44 is provided on the first side surface 3 of the base so that the second control convex portion 29 of the excavating arm 15 comes into contact with the excavating arm 15 in a swinging state and restricts the swinging.

(5) The oscillating spacer 30 is configured by projecting a shaft projecting piece 36 on a straight portion 32 of one end 34 of a spacer base 31 having a flat semicircular shape (one side is a straight portion 32 and the other side is a curved portion 33). . A thick portion 35 is formed on the other end 34a of the spur base 31 (FIG. 1C).

  A mounting block 41 is fixed to the second side surface 8 of the bulging portion 6 of the head body 1, and the swing spacer 30 is fixed to the mounting block 41 by a rotating shaft 37 that is mounted at the approximate center of the shaft protruding piece 36. The mounting block 41 is arranged so as to be located below the first large diameter stopper 43 (outward along the one side surface 17) in a state where the one side surface 17 of the excavating arm 15 is in contact with the first large diameter stopper 43. (FIG. 2 (a), FIG. 6 (a)).

Further, the distance from the rotational axis 37 (substantially the center of the shaft protruding piece 36) to the distal end of the spacer body 31 (leading end 35a of the thick portion 35) and _{L 1,} from the rotational axis 37 (substantially the center of the shaft projecting pieces 36) the distance to the curved portion 33 of the spacer body 31 and _{L 2} (FIG. 2 (c)). L ₁ > L ₂ is formed.

(6) The excavation head 50 is configured as described above (FIGS. 2A and 2B and FIG. 3). In the figure, 46 is a stirring plate attached to the second side surface of the base 2 of the head body 1 (FIGS. 2A and 2B). In the figure, 47 is a lower surface 6b of the bulging portion 6 of the head body 1. The cement milk supplied from the ground through the discharge port 47 can be discharged into the pile hole with the discharge port formed at substantially the center of the hole (FIG. 3).

[2] Operation of the excavation head 50

(1) The connecting shaft portion 5 of the head main body 1 is attached to the tip of the excavation rod 52 in which a spiral for earth removal (not shown) is formed (FIGS. 2A and 2B).

(2) In a state where the excavation rod 52 does not rotate (the excavation head 50 also does not rotate), the excavation arms 15 and 15 of the excavation head 50 are in a state where they hang downward due to their own weight (FIGS. 2A and 2B). FIG. 3). Further, in this state, the oscillating spacer 30 is arranged in the lateral direction (the straight portion 32 is almost horizontal, in the neutral state) with the tip 35a of the thick portion 35 facing the excavation arm 15. Further, the thick part 35 of the swing spacer 30 is in a state of riding on the upper edge 28a of the first control convex part 28 of the excavating arm 15 (FIG. 2A).

  Therefore, since the rocking spacer 30 is formed sufficiently lighter than the excavation head 50, the rocking spacer 30 maintains a lateral position. Moreover, when applied to the medium excavation method, the excavation head 50 can be inserted through the hollow portion 63 of the ready-made pile in this state (FIG. 3).

(3) Next, when the excavating rod 52 is rotated forward (in the direction of arrow 53a), the excavating blades 24 and 24 of the excavating arms 15 and 15 are subjected to earth pressure and swing to one side (in the direction of arrow 53). . As the excavation arm 15 swings to one side, the first control convex portion 28 pushes up the thick portion 35 of the swing spacer 30, and the swing spacer 30 rotates clockwise around the rotation shaft 37 (arrow 55. The thick portion 35 is pushed out by the first control convex portion 28, and the lower edge 35b of the thick portion 35 is positioned above the first control convex portion 28 (FIG. 4A). ).

Then, the linear portion 32 of the swing spacer 30 contacts and closely contacts the first large diameter stopper 43, and the curved portion 33 of the swing spacer 30 contacts the one side surface 17 of the excavating arm 15. Therefore, the oscillating spacer 30 is stably interposed between the first large diameter stopper 43 and the excavating arm 15 (attached state), and the rotation shaft 37 of the oscillating spacer 30 and one side surface 17 of the excavating arm 15 are arranged. during is kept to a length corresponding to the distance _{L 2} (FIG. 2 (c)).

Thus, the drilling arm 15 is kept small excavation state (small swing position), digging edge 24 and 24, by a fixed excavating blade 10, 10, Kuiana shaft 60 of diameter _{D 1} is drilled (Fig. 4 (A), FIG. 5).

(4) Once the excavation of the pile hole shaft portion 60 having the diameter D ₁ is completed, once the excavation rod 52 stops rotating, the excavation arms 15 and 15 are slightly moved from one side to the other side (indicated by arrows). It swings in the direction (54) and approaches the drooped state (FIGS. 2A and 2B). In this state, the locking of the thick portion 35 of the swing spacer 30 and the first control convex portion 28 is released, and the swing spacer 30 hangs down under its own weight. Therefore, the rocking spacer 30 is detached from between the first large diameter stopper 43 and the one side surface 17 of the excavating arm 15 and is in a detached state.

  In this state, when the excavating rod 52 is rotated forward again (in the direction of the arrow 53a), the one side surface 17 of the excavating arm 15 pushes up the tip 35a of the thick portion 35 of the swinging spacer 30 in a state of hanging downward. The rocking spacer 30 is further rotated clockwise (in the direction of arrow 55) so that one side surface 17 of the excavating arm 15 contacts the first large diameter stopper 43. In this state, the first control convex portion 28 of the excavating arm 15 is formed at a position where it does not contact the first large diameter stopper 43. In addition, since the tip 36 a of the shaft protrusion piece 36 of the pivoting swing spacer 30 contacts the one side surface 17 of the excavating arm 15, the tip 36 a of the shaft protrusion piece 36 performs the same function as the first large diameter stopper 43. To do.

At the same time, the second control convex portion 29 of the excavating arm 15 contacts the large-diameter second stopper 44 (FIG. 6). Thus, the drilling arm 15 holds the large径揺turned position, allows to drill an enlarged root consolidated portion 61 of diameter D ₂ below the Kuianajiku portion 60 (or the bottom).

  When switching from small-diameter rocking to large-diameter rocking, the excavation rod 52 does not rotate in the reverse direction, but remains in the normal rotation. Soil is made.

[3] Other embodiments

(1) In the above-described embodiment, since the excavation rod 52 is formed with a spiral for earth removal, it is effective for a construction method (especially the medium excavation method) for excavating while earth is being removed, but the earth removal spiral is omitted. You can also.

(2) Moreover, in the said Example, the structure of the rocking | fluctuation stopper 30 is not restricted to an Example, If it can detachably attach between a 1st large diameter stopper and an excavation arm, it can also be set as another structure (FIG. Not shown).

(3) In the above-described embodiment, the excavation head 50 has a structure that can be swung in the other side 54 direction by the reverse rotation of the excavation rod 52 (direction 54a). If the stopper is installed, the excavation rod 52 can be excavated with at least three diameters by forward rotation and reverse rotation (not shown).

In the embodiment of the present invention, (a) represents a neutral state, (b) represents a small diameter excavation state, and (c) represents a large diameter excavation state. In the embodiment of the present invention, a neutral state is shown, (a) is a front view, (b) is a side view, and (c) is an enlarged view of a swing spacer. Similarly, it is a bottom view in a neutral state. In the Example of this invention, a small diameter excavation state is represented, (a) is a front view, (b) is a side view. It is a bottom view of a small diameter excavation state similarly. In the Example of this invention, a large-diameter excavation state is represented, (a) is a front view, (b) is a side view. It is a bottom view of a large diameter excavation state similarly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Head main body 2 Base 2a of a head main body 3 Upper end 3 of a base 1st side surface 4 2nd side surface 5 of a base 5 Connection shaft part 6 The bulging part 6b of a head main body 7 The lower surface 7 of a bulging part The 1st side 8 of a bulging part Second side surface 10 of the bulging portion Fixed excavating blade 12 Horizontal shaft 15 Excavating arm 16 Outer surface 16a of excavating arm 17 One side surface of excavating arm 18 Other side surface of excavating arm 20 Proximal end portion 21 of excavating arm Intermediate portion 22 Excavation arm tip 24 Excavation blade 25 Protective projection plate 28 First control convex portion 29 Second control convex portion 30 Oscillating spacer 31 Oscillating spacer spacer base 32 Sparser base linear portion 33 Spacer base curved portion 34 One end 34a of the spacer base 35 The other end 35 of the spacer base Thick part 35a of the rocking spacer Thick end 35b Thick end 35b Lower edge 36 of the thick part Shaft protrusion 37 of the rocking spacer Rotating shaft of the rocking spacer 1 mounting block 43 first large diameter stopper 44 second large-diameter stopper 46 agitation plate 47 discharge port 52 drill rod 53 arrow (swing direction)
53a Forward rotation direction 54 Arrow indication (swing direction)
54a Reverse rotation direction 55 Arrow 60 Pile hole shaft part 61 Pile hole enlarged root part 63 Hollow part of ready-made pile

Claims (2)

At the both sides of the head body that has a connecting part with the excavation rod, a horizontal axis and excavation arm with an excavation blade at the tip are attached swingably,
The drilling arm is in the neutral position when the drilling rod does not rotate;
A pile hole excavation head configured as follows in a head for excavating a pile hole that can swing the excavation arm to one side by forward rotation of the excavation rod.
(1) The excavation arm can take a large swinging position to one side by swinging to the one side, and a large-diameter stopper for holding the excavation arm at the large swinging position on the head body. Provide.
(2) The excavation arm and / or the head main body is provided with a spacer that can be detachably disposed between the large-diameter stopper and the excavation arm by swinging the excavation arm to the one side.
(3) When the spacer is in a detached state, the excavation arm comes into contact with the large-diameter stopper and large-diameter excavation can be performed at a large swing position.
(4) When the spacer is in a worn state, the excavation arm comes into contact with the spacer and can excavate a small diameter at a small swing position. The pile hole excavation head according to claim 1, wherein the spacer is configured as follows.
(1) The head body is provided with a rotation axis parallel to the swing axis at the “position of the large diameter stopper” or “position close to the large diameter stopper”.
(2) A spacer is attached so as to be rotatable around the rotation axis.

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