JP2023004499A - cut bucket - Google Patents

Abstract

To provide a cut bucket which can securely and reliably scoop out concrete and rebar cut pieces accumulated inside a cut drum by flattening the bottom of the space left by excavating existing piles.SOLUTION: A cut bucket 1a includes a cut drum 2, an arm 4a provided along the radial direction at the upper part of the inner side 2a of the cut drum 2 and bent upward, and multiple arm bits v1 - v9 attached along the bottom surface of the arm 4a, and the tips of the arm bits v1 - v9 are positioned on the same virtual plane F.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a cut bucket used for excavating and removing an existing pile made of reinforced concrete that has been driven into the ground in a vertical position.

In order to excavate and remove the existing piles in the ground, a cylindrical cut drum that has the same axial direction and almost the same diameter as the existing piles and an upward facing radially attached to the upper part of the inner side of this cut drum A cut bucket has been proposed, which has an arm that bends into a straight line, a plurality of arm bits replaceably attached to the bottom surface of the arm, and a plurality of drum cutting bits replaceably attached to the lower end surface of the bucket drum. (See Patent Document 1, for example).

According to the cut bucket configured in this way, it is possible to excavate and remove the existing piles driven into the soil easily, safely, at low construction costs, and in a short construction period. there is
However, when the cut bucket is used, since the plurality of arm bits are arranged in a mountain shape on the blade plate in a side view, the existing pile crest surface tends to have a conical shape or an upward convex shape. As a result, when scooping out the broken pieces of concrete taken inside the cut drum with a cable lift shovel or the like suspended at the lower end of the Kelly bar, there is a possibility that the opening and closing operation of the shovel may become difficult.

Registered utility model publication No. 3205279 (pages 1 to 5, FIGS. 1 to 3)

The present invention solves the problems described in the background art, and by flattening the bottom of the space left by excavating the existing piles, the crushed concrete taken inside the cut drum can be scooped out safely and reliably. The task is to provide a cut bucket.

In order to solve the above problems, the present invention provides a plurality of arm bits on the inner upper part of the cut drum so that the top surface of the existing pile including the cut surface of the reinforcing bar embedded in the existing pile is almost flush. It was created with the idea of arranging.
That is, the cut bucket of the present invention includes a cut drum, an arm provided along the radial direction in the upper part of the inner side of the cut drum and bent upward or straight in the horizontal direction, and such an arm A cut bucket comprising a plurality of arm bits attached along the bottom surface of the
The tips of the plurality of arm bits are positioned on the same imaginary plane.

Also, in the cut bucket according to the second aspect of the present invention, the imaginary coplanar plane is orthogonal to the central axis of the cut drum.
Furthermore, in the cut bucket according to the third aspect of the present invention, the arm bit is arranged asymmetrically with respect to the center of the arm.
In the cut bucket according to the fourth aspect of the present invention, the arm bit has a second portion and a second portion divided at the center, and the first portion includes a 1-1 arm bit and a 1-2 arm bit. A bit is arranged, and a 2-1 arm bit is arranged in the second portion,
1-1 distance from the center to the 1-1 arm bit <2-1 distance from the center to the 2-1 arm bit <1-1 distance from the center to the 1-2 arm bit 2 distances.

In the cut bucket according to the fifth aspect of the present invention, the plurality of arm bits are attached to the bottom surface of the arm at different angles of inclination with respect to the central axis of the cut drum.

Further, in the cut bucket according to the sixth aspect of the present invention, among the plurality of arm bits, the arm bit arranged on the center side of the cut drum is more likely than the arm bit arranged on the outer peripheral side of the cut drum. , the inclination angle with respect to the central axis of the cut drum is small.
In addition, in the cut bucket according to the seventh aspect of the present invention, the bending point of the arm bending upward is offset from the central axis of the cutting drum.
The cut bucket according to the eighth aspect of the present invention has a screw attached to the upper side of the cut drum.

According to the cut bucket of the present invention, since the tips of the plurality of arm bits are positioned on the same virtual plane, the top surface (bottom surface) of the existing pile is aligned with the positions of the tips of the plurality of arm bits. A corresponding flat surface is likely to be formed, and according to the cut bucket of the second aspect, the top surface is likely to be horizontal. As a result, a power shovel or the like suspended from the lower end of the Kelly bar can easily, reliably, and safely scoop out the crushed pieces of concrete caught inside the cut drum to the ground surface side.

According to the cut bucket of the third aspect, since the arm bits are arranged asymmetrically with respect to the center of the arm, each arm bit abuts on a different part of the top surface of the existing pile, and does not overlap. . As a result, the top surface of the existing pile can be destroyed efficiently.
According to the cut bucket of the fourth aspect, when viewed from the rotation center of the arm, the 2-1 arm bit rotates between the rotation trajectory of the 1-1 arm bit and the rotation trajectory of the 1-2 arm bit. The trajectory will be located. As a result, different arm bits can be prevented from coming into contact with the same portion of the top surface of the existing pile. In other words, each arm bit can be more evenly distributed over the top surface of the existing pile, and the top surface can be destroyed efficiently.

According to the cut bucket of the fifth aspect, by appropriately selecting the inclination angle of the plurality of arm bits with respect to the central axis of the cut drum, the tips of the arm bits can be easily arranged on the same plane. becomes.
Furthermore, according to the cut bucket of the sixth aspect, when the arm is bent upward at the center, the plurality of arm bits approach the vertical posture toward the center of the cut drum, and the outer circumference of the cut drum The attitude of the cutting drum has a larger inclination angle with respect to the central axis of the cutting drum toward the side. Since the tips of the arm bits are arranged on a virtual plane, the axial length of the central arm bit, which rotates at a relatively slow speed, is relatively long, and the shaft of the outer peripheral arm bit, which rotates at a relatively high speed. The direction length becomes relatively short. Thereby, the durability (life) of each arm bit can be made uniform.

In addition, according to the cut bucket of the seventh aspect, the upwardly bent arm is bilaterally asymmetric in that the bending point is off the central axis of the cut drum in a side view. It becomes easy to arbitrarily and variously arrange the attachment form of a plurality of arm bits to be attached along.
According to the cut bucket of the eighth aspect, since the screw is attached to the upper side of the cut drum, the material of the existing pile destroyed by the cut bucket can be easily discharged, thereby improving the removal work of the existing pile.

The cut drum is made of thick-walled steel pipe, and its outer diameter is close to the outer diameter of the existing pile to be removed, or slightly smaller than the outer diameter of the existing pile.
In addition, the cut drum includes a plurality of support beams radially installed on the upper end side of the inside (hollow portion), and a kelly projecting upward near the center of the cut drum on the upper surface of the support beams. It is suspended from the lower end of a vertically installed Kelly bar via a bar socket and can be raised and lowered.
Further, the upwardly bent arm may have a laterally symmetrical chevron shape in a side view, or a laterally asymmetrical V shape.
In addition, a plurality of drum bits having the same shape and posture are attached to the lower end surface of the cut drum at equal intervals and exchangeably.

(A) is a plan view showing a cut bucket that is one embodiment according to the present invention, and (B) is a vertical cross-sectional view thereof. FIG. 2 is a partially enlarged view showing the vicinity of an arm in the cut bucket of FIG. 1(B); (A) is a plan view showing a cut bucket of a different embodiment, and (B) is a vertical sectional view thereof. FIG. 4 is a partially enlarged view showing the vicinity of an arm in the cut bucket of FIG. 3(B); (A) is a plan view showing a cut bucket that is a further different embodiment, and (B) is a vertical sectional view thereof.

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated.
FIG. 1(A) is a plan view showing a cut bucket 1a of one embodiment according to the present invention, FIG. 1(B) is a vertical sectional view thereof, and FIG. 2 shows the vicinity of an arm 4a in FIG. 1(B). It is a partially enlarged view.
As shown in the figure, the cut bucket 1a includes a cut drum 2 having a cylindrical shape as a whole, a support beam 3 attached in a cross shape in a plan view along an upper end side opening in an inner side (hollow portion) 2a of the cut drum 2, An arm 4a provided in a bilaterally symmetrical chevron shape in a side view at a position directly below one straight portion of the support beam 3, and a plurality of arm bits attached to the bottom surface of the arm 4a along the bottom surface thereof. and v1 to v9.

The cut drum 2 is made by bending a thick steel plate into a cylindrical shape and then welding it along the seam. The length (height) in the direction is about 1-2 m.
On the upper surface of the intersecting portion of the support beam 3, a generally cylindrical Kelly bar socket 5 having a pin hole h penetrating along the radial direction is erected by welding or the like. The socket 5 is integrally connected to the lower end of a kelly bar (neither shown) that can be lifted and rotated in a vertical position to a multidrill placed in place on the ground side.

Further, the arm 4a is attached to the above-described position by welding so that its bending portion (bending point) 4x coincides with the central axis S of the cut drum 2 in plan view. Incidentally, the left and right sides (the first portion 4a1 and the second portion 4a2) of the arm 4a sandwiching the bent portion 4x are inclined in the range of about 5 to 20 degrees with respect to the bottom surface (horizontal line) of the support beam 3. The angle of the lower side sandwiched between the left and right sides is approximately 140 to 170 degrees.
In addition, on the lower end surface 2b of the cut drum 2, a plurality of drum bits V having the same shape and dimensions are arranged along the circumferential direction in the same orientation and posture via the support members 6. They are installed at regular intervals and interchangeably.

As shown in FIG. 2, the plurality of arm bits v1 to v9 are attached to the bottom surface of the arm 4a along the longitudinal direction in an attitude obliquely downward from the bottom surface and are replaceable. The plurality of arm bits v1 to v9 have different distances from the center axis S of the cut drum 2, that is, the rotation center 4x of the arm 4a (asymmetrical with respect to the rotation center 4x). They are attached at positions separated from the central axis S in order.
In other words, the 1-1 arm bit v1 and the 1-2 arm bit v2 are arranged in order on the first portion 4a1 of the arm 4a from the center 4x side, and the second arm bit v2 is arranged on the second portion 4a2 from the center 4x side. The positional relationship with the 2-1 arm bit v5 is as follows. That is, the distance L1-1 from the center 4x to the 1st-1st arm bit v1 < the distance L2-1 from the center 4x to the 1st-2nd arm bit v2 < the distance L1- from the center 4x to the 1st-2nd arm bit v2 2.
As a result, the rotational trajectories of the arm bits v1 to v9 in plan view draw parallel concentric circles without overlapping each other.
Further, the inclination angle θn along the axial direction (longitudinal direction) of the arm bits v1 to v9 with respect to the central axis S of the cut drum 2 is, as shown in FIG. It gradually increases toward the inclination angle θ9 of the arm bit v9 on the outer peripheral side.

Further, as shown in FIG. 1B, the lower end (tip) of each of the arm bits v1 to v9 is located on the same (single) virtual plane (horizontal plane) F orthogonal to the central axis S of the cut drum 2. installed as shown.
If the above-mentioned point that each tip is positioned on the same plane F and the point that the order of the inclination angle θn is satisfied, the length of the arm bits v1 to v9 along the axial direction is 2 may be made as short as possible. Also, the total number of arm bits vn is not particularly limited.

According to the cut bucket 1a as described above, since the tips of the plurality of arm bits v1 to v9 are positioned on the same virtual plane F, the bottom surface (top surface) of the existing pile after excavation is aligned with the arm bit It becomes easy to form a flat surface corresponding to the positions of the tips of v1 to v9. As a result, a power shovel or the like suspended from the lower end of a Kelly bar (not shown) can easily, reliably, and safely scoop out concrete fragments caught in the inner side 2a of the cut drum 2 to the ground surface side. becomes. Furthermore, since the volume of the excavated and transported concrete among the existing piles to be removed can be calculated relatively accurately, the total amount of soil, mortar, or concrete required to fill the supplementary space can be calculated. In addition, the calculation accuracy of the construction cost can be easily increased.

FIG. 3(A) is a plan view showing a different form of cut bucket 1b, FIG. 3(B) is a vertical sectional view thereof, and FIG. 4 is a partial enlarged view showing the vicinity of the arm 4b.
The cut bucket 1b includes a cut drum 2, support beams 3, Kelly bar sockets 5, and a plurality of drum bits V similar to those described above. The cut bucket 1b is different from the cut bucket 1a in that an arm 4b is provided at a position directly below one of the straight portions of the support beam 3, and is asymmetrical in side view. A plurality of arm bits v1 to v8 are exchangeably attached to the bottom surface of the arm 4b along the longitudinal direction thereof.

As shown in FIGS. 3(B) and 4, the arm 4b has a left-right asymmetrical V-shape with the right side located on the right side of the bent portion 4x being longer than the left side located on the left side of the bent portion 4x. ing. That is, the bent portion 4x of the arm 4b is located outside the central axis S of the cut drum 2 and outside thereof. Incidentally, in the drawing, the long side of the arm 4b located on the right side of the bent portion 4x has a downward inclination angle of about 5 to 10 degrees with respect to the bottom surface (horizontal line) of the support beam 3. The downward inclination angle of the support beam 3 on the left short side with respect to the bottom surface is about 10 to 15 degrees.

Further, the plurality of arm bits v1 to v8 set the inclination angles θn with respect to the central axis S of the cut drum 2 to arm bits v5, v1, v6, v2, v7, v3, v5, v1, v6, v2, v7, v3, as illustrated in FIG. It is also possible to adopt a mode in which v8 and v4 are sequentially increased in order.
Alternatively, as shown in FIG. 4, the inclination angle .theta.n may be sequentially increased in the order of arm bits v1, v5, v2, v6, v3, v7, v4, and v8, as in the case of the cut bucket 1a. Also good. In the case of such a configuration, the width (length) wn of each tip end face of the arm bits v1 to v8 in a plan view is sequentially increased with the relationship of w1<w5<w2<w6<w3<w7<w4<w8.

According to the cut bucket 1b described above, in addition to the effects obtained by the cut bucket 1a, by using the arm 4b asymmetrical in side view, a plurality of arm bits v1 are attached along the bottom surface of the arm 4b. ∼ v8 can be freely and easily arranged in various forms.
The long side of the arm 4b, which is relatively long when viewed from the side, may be gently curved along the axial direction, or may have one or more slight bends in its intermediate portion. Also, the total number of arm bits vn is not particularly limited as long as the above conditions are satisfied.

FIG. 5(A) is a plan view showing a cut bucket 1c in a different form, and FIG. 5(B) is a vertical sectional view thereof.
The cut bucket 1c includes a cut drum 2, support beams 3, Kelly bar sockets 5, and a plurality of drum bits V similar to those described above. The cut bucket 1c is different from the cut buckets 1a and 1b in that the cut drum 2 has an arm 4c which is parallel to one of the straight portions of the support beam 3 and which is straight in the horizontal direction. is provided by welding or the like on the inner side 2a of the . A plurality of connecting members 7 are arranged between the arm 4 c and one of the support beams 3 .

As shown in FIG. 5(B), on the bottom surface of the arm 4c in the horizontal posture, a plurality of arm bits v1 to v7 are arranged along the longitudinal direction of the bottom surface in a posture obliquely downward from the bottom surface, and mounted interchangeably. The lower ends (tips) of the plurality of arm bits v1 to v7 are also positioned on the horizontal plane F. As shown in FIG. Further, the plurality of arm bits v1 to v7 are different from each other in distance from the central axis S of the cut drum 2, and are attached at positions separated from the central axis S in the order of the arm bits v1 to v7. . Therefore, the rotational trajectories of the arm bits v1 to v7 in plan view draw concentric circles parallel to each other.

Furthermore, the plurality of arm bits v1 to v7 have substantially the same axial length and shape. Therefore, it is possible to relatively easily manufacture a plurality of arm bits v1 to v7, attach them to the arm 4c, and replace them.
Note that the total number of the plurality of arm bits vn is not particularly limited as long as the above conditions are met.

According to the cut bucket 1c as described above, the effect obtained by the cut bucket 1a can be obtained more reliably, and since the lengths and shapes of the plurality of arm bits v1 to v7 in the axial direction are substantially the same, Since the production of the plurality of arm bits v1 to v7, attachment to the arm 4c, and replacement work can be performed relatively easily and quickly, it is also possible to reduce the labor required for maintenance.

The present invention is not limited to each form described above.
For example, a screw can be provided on the upper edge of the cut bucket.
The upper edge of the cut drum shown in FIG. 1 is bulged axially upward, and a screw is installed therein. This screw is fixed in the socket and rotates with the cut bucket. Concrete fragments of existing piles destroyed by the arm bit are efficiently ejected by this screw.

In each of the above examples, the support beams 3 are aligned along the radial direction of the cut drum 2 in plan view, or three or more linear portions are aligned with each other with respect to the central axis S of the cut drum 2 . A configuration in which they are arranged so as to be point symmetrical may be adopted.
The upwardly bent arm inclines upward toward the central axis S of the cut drum 2 in a side view, or gently curves upward and assumes a horizontal posture toward the outer circumference of the cut drum 2, Alternatively, a form that approximates a horizontal posture may be used.
The imaginary same plane F may be substantially orthogonal to the central axis S of the cut drum 2 within a range of 90 degrees ±1 to 2 degrees.

In the case of the cut bucket 1c, one of the linear portions of the support beam 3 and the arm 4c in the horizontal posture are also used, and the plurality of arm bits v1 to v7 are attached to the bottom surface of the one linear portion of the support beam 3. may be attached directly.
The outer shape of the Kelly bar socket 5 may be a regular polygonal prism having a square prism or more, or a modified polygonal prism thereof.
In addition to the above, the present invention can be modified as appropriate without departing from the gist thereof.

According to the present invention, it is possible to provide a cut bucket capable of safely and reliably scooping up crushed pieces of concrete taken into the inside of the cut drum by flattening the bottom surface of the space left by excavating the existing pile.

1a to 1c cut bucket 2 cut drum 4a to 4c arm 4x bending portion (bending point)
v1-v9 Arm bit F Virtual same plane S Central axis of cut drum θ1-θ9 Tilt angle

Claims (8)

cut drum and
an arm that is radially provided on the inner upper portion of the cut drum and that is bent upward or straight in the horizontal direction;
a plurality of arm bits attached along the bottom surface of the arm, the cut bucket comprising:
The tips of the plurality of arm bits are located on the same virtual plane,
cut bucket. The imaginary coplanar plane is orthogonal to the central axis of the cut drum,
The cut bucket of Claim 1. 3. The cut bucket according to claim 1 or 2, wherein the arm bit is arranged asymmetrically with respect to the center of the arm. The arm bit has a first part and a second part divided at the center, a 1-1 arm bit and a 1-2 arm bit are arranged in the first part, and a second arm bit is arranged in the second part. -1 arm bit is placed,
1-1 distance from the center to the 1-1 arm bit <2-1 distance from the center to the 2-1 arm bit <1-1 distance from the center to the 1-2 arm bit 2 distances,
A cut bucket according to claim 3. The plurality of arm bits are attached to the bottom surface of the arm at different angles of inclination with respect to the central axis of the cut drum.
A cut bucket according to any one of claims 1 to 4. Among the plurality of arm bits, the arm bit arranged on the center side of the cut drum has a smaller angle of inclination with respect to the central axis of the cut drum than the arm bit arranged on the outer peripheral side of the cut drum.
A cut bucket according to any one of claims 1 to 5. the bending point of the arm bending upward is off the central axis of the cutting drum;
The cut bucket according to any one of claims 1-6. The cut bucket according to any one of claims 1 to 7, wherein a screw is attached to the upper side of the cut drum.

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