JP6093466B1 - Extra concrete removal bucket - Google Patents

Abstract

A bucket capable of cleanly removing excess concrete above a predetermined design top height is provided. A surplus concrete removing bucket (10) includes a circular bottom wall (11) having a flat lower surface (11d), a cylindrical peripheral wall (12) rising from an outer edge of the bottom wall, and a peripheral wall. Extra-concrete concrete taking in between the connecting part (18) for connecting with the Kelly bar (101) rotating around the central axis of the part and the bottom wall part between the center and the outer edge of the bottom wall part And a lid member (17) that is disposed in the inner space of the peripheral wall portion and opens and closes the extra-concrete intake port. The lid member is connected to the bottom wall portion by a pivot and swings downward. It can swing between a closed position where it moves to close the extra concrete intake and an open position that swings upward and separates from the extra concrete intake. [Selection] Figure 7

Description

  The present invention relates to a bucket that is used for construction of a cast-in-place concrete pile and performs pile head processing.

  When excavating the ground with an earth drill method or the like to create a pile hole, and placing concrete into the pile hole, a concrete pile is built from the bottom of the hole to the specified design top height. For the purpose of launching concrete, concrete is placed beyond the design top height. This is called surplus concrete. The surplus concrete is not only unnecessary in design, but also includes poor concrete including earth and sand and slime. For this reason, it is necessary to remove the extra concrete that accumulates above the design top edge height as a boundary. As buckets for performing such pile head processing, for example, those described in JP-A-60-198115 (Patent Document 1) and JP-A-4-347208 (Patent Document 2) are known.

  The extra-concrete removal bucket described in Patent Document 1 includes a bucket body, a shaft extending along the central axis of the bucket body, and an opening and a cover plate provided on the bottom surface of the bucket body. The lid plate is coupled to the lower end of the shaft, and can be rotated clockwise and counterclockwise about the shaft. The upper end of the shaft is connected to the kelly bar. When torque is applied to the shaft from the kelly bar, the lid plate rotates to close or open the opening.

  The extra-concrete removal bucket described in Patent Document 2 also includes a bucket body, an axis extending along the central axis of the bucket body, and an opening and a shutter provided on the bottom surface of the bucket body. The shutter is coupled to the lower end of the shaft, and can be rotated clockwise and counterclockwise about the shaft. The upper end of the shaft is connected to the kelly bar. When torque is applied from the kelly bar to the shaft, the shutter rotates to close or open the opening.

JP-A-60-198115 JP-A-4-347208

  However, the present inventor has found that there is a point to be further improved in the above-described extra-concrete concrete removing bucket. That is, since the opening is opened and closed by rotating the shaft and the shutter relative to the bucket body, the opening may not be completely closed if the bucket body rotates together with the shaft for some reason. Therefore, if extra concrete is taken into the bucket body and the bucket body is pulled up from the pile hole while the opening is incompletely closed, the extra concrete leaks from the opening of the bucket body and falls.

  In particular, the extra-concrete removal bucket described in Patent Document 1 has a conical bottom surface, and the center protrudes downward from the outer edge, so that it is not possible to cleanly remove extra-concrete according to a predetermined design top height. .

  In view of the above situation, the present invention aims to provide a technology that can remove the extra concrete in accordance with a predetermined design top height and can reliably close the opening on the bottom surface of the bucket. To do.

For this purpose, the extra-concrete removal bucket according to the present invention is a bucket for removing extra-concrete from a pile head of a cast-in-place concrete pile, and has a circular bottom wall portion having a flat lower surface, and a bottom wall portion. A cylindrical peripheral wall portion that rises from the outer edge, a erection member that is erected on the peripheral wall portion, and a connection portion that is provided on the erection member and is connected to a rotation shaft that rotates about the central axis of the peripheral wall portion so as not to be relatively rotatable A surplus concrete intake that is disposed between the center and outer edge of the bottom wall and penetrates the bottom wall; and a lid member that is disposed in the internal space of the peripheral wall and opens and closes the surplus concrete intake With. And the cover member has a circumferential direction one edge and a circumferential direction other edge on the basis of the center of the bottom wall portion, and the circumferential direction one edge is connected to the bottom wall portion on the circumferential direction one side of the surplus concrete intake port, Closed position where the other edge in the circumferential direction can swing in the vertical direction, swinging downward to close the extra concrete intake, and open position swinging upward to separate from the extra concrete intake Can swing between the two.

  According to the present invention, since the lid member swings in the vertical direction, when the bucket is lifted, the lid member is caused by the weight of the surplus concrete taken in above the bottom wall portion of the bucket and the weight of the lid member. Moves securely to the closed position. Therefore, the surplus concrete intake port can be completely closed. Moreover, according to this invention, since the bottom wall part of a bucket has a flat lower surface, the surplus concrete above a predetermined design top end height can be removed cleanly. Therefore, pile head processing can be performed efficiently. The extra concrete intake may be provided only at one place, or may be provided at a plurality of places.

  There may be one or more surplus concrete intakes. As a preferred embodiment of the present invention, a plurality of extra-concrete concrete intakes are arranged at intervals in the circumferential direction. More preferably, they are arranged at equal intervals in the circumferential direction. The lid member may be a hard plate such as iron, or may be a member that swings due to elastic deformation, such as rubber. As a preferred embodiment of the present invention, one circumferential edge of the lid member is connected to the bottom wall portion via a pivot. According to this embodiment, it is possible to reliably open and close the hard lid member that is not elastically deformed, such as iron. As another embodiment, one circumferential edge of the lid member may be coupled to the bottom wall portion via a rubber material. The opening degree of the lid member is not particularly limited, but the opening degree of the lid member is regulated by a stopper as a preferred embodiment of the present invention. According to this embodiment, the lid member can be prevented from opening excessively, the lower surface of the lid member can be always directed downward, and the lid member can be reliably returned to the closed position by its own weight.

  The bottom wall portion of the bucket is not particularly limited as long as the bottom surface is flat, but the top surface of the bottom wall portion is preferred from the other circumferential edge of the surplus concrete intake as a preferred embodiment of the present invention. It is formed in an ascending slope that becomes higher as it goes away in the circumferential direction. According to this embodiment, the edge of the concrete intake can be made an acute angle like an edge. Therefore, while preventing the concrete below the design top height from being disturbed, the surplus concrete above the design top height can be removed with a knife. As another embodiment, the upper surface of the bottom wall portion may be flat.

  The shape and number of the surplus concrete intake are not particularly limited, but as a preferred embodiment of the present invention, the surplus concrete intake is adjacent to the top portion adjacent to the center portion of the bottom wall portion and the outer edge of the bottom wall portion. It is a sector hole defined by a substantially arc, and one circumferential edge of the lid member is connected to one circumferential edge of the sector hole. According to this embodiment, when the extra concrete removal bucket is rotated, extra concrete can be efficiently taken in between the center of the bottom wall portion and the outer edge. As another embodiment, the extra-concrete concrete intake may be rectangular, half-moon shaped, or other shape.

  As a further preferred embodiment of the present invention, the bottom wall portion is detachably attached to the lower end of the peripheral wall portion, and is selectively set to a normal position covering the lower end of the peripheral wall portion and a release position away from the lower end of the peripheral wall portion. According to this embodiment, the bottom wall portion of the bucket is released, and the surplus concrete taken in the bucket can be easily discharged. Therefore, the cleaning up after the pile head processing can be efficiently performed.

  The connection structure between the bucket peripheral wall portion and the bucket bottom wall portion is not particularly limited. However, as one embodiment of the present invention, the bottom wall portion can be rotated to the lower end of the peripheral wall portion at one circumferential position on the outer edge of the bottom wall portion. Connected to According to such an embodiment, since the bottom wall portion rotates, the bucket bottom wall portion can be easily and quickly set to the release position by the weight of the surplus concrete taken in and the weight of the bottom wall portion. When the bottom wall portion is set to the release position, the outer circumferential edge of the bottom wall portion is separated downward from the lower end of the peripheral wall portion while one circumferential position of the outer edge of the bottom wall portion is connected to the lower end of the peripheral wall portion. . As another embodiment, the bottom wall portion may be slidably attached to the lower end of the peripheral wall portion.

  As described above, according to the present invention, the surplus concrete can be removed cleanly in accordance with a predetermined design top height. Therefore, pile head processing can be completed accurately in a short time, and construction efficiency is improved.

It is a top view which shows the surplus concrete removal bucket which becomes one Embodiment of this invention. It is a side view which shows the same embodiment. It is a bottom view showing the embodiment. It is an internal top view which shows the bottom wall part upper surface of the embodiment. It is an expanded sectional view showing the thickness of the bottom wall part of the embodiment. It is an expanded sectional view showing the thickness of the bottom wall part of the embodiment. It is a longitudinal cross-sectional view which shows a mode that the embodiment takes in surplus concrete. It is a longitudinal cross-sectional view which shows the displacement of the bottom wall part of the embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view showing an extra concrete removing bucket according to an embodiment of the present invention. FIG. 2 is a side view showing the embodiment, and a partial cross-section is shown for reference. FIG. 3 is a bottom view showing the embodiment, showing a bottom surface of the bottom wall portion. FIG. 4 is an internal plan view showing an upper surface of the bottom wall portion of the embodiment, and shows a state in which the bottom wall portion is viewed from the inside of the surplus concrete removing bucket. The surplus concrete removing bucket 10 is a bottomed iron bucket, and includes a circular bottom wall portion 11 and a cylindrical peripheral wall portion 12. The peripheral wall portion 12 rises from the outer edge of the bottom wall portion 11.

  The peripheral wall portion 12 forms a side portion of the extra concrete removing bucket 10. An upper end of the peripheral wall portion 12 is extended with a burley 14 having a shape that swells upward. A beam 16 is installed on the upper end portion of the peripheral wall portion 12. The beam 16 extends along the diameter of the peripheral wall 12 and is joined at the center of the peripheral wall 12. The rigidity of the peripheral wall portion 12 is increased by the beam 16. A connecting portion 18 is provided at a connecting portion between the beams 16. The connecting portion 18 has a cross-sectional shape such as a square or other polygons, and protrudes upward. The connecting portion 18 can be connected to a kelly bar (not shown) so as not to be relatively rotatable.

  The bottom wall 11 is a circular plate having an upper surface and a lower surface 11d, and the lower surface 11d is formed flat. The bottom wall portion 11 forms the bottom portion of the extra concrete removing bucket 10 and covers the lower end of the peripheral wall portion 12. As shown in FIG. 3, the bottom wall portion 11 has a fan-shaped hole 13 for taking in the surplus concrete. The fan-shaped hole 13 passes through the bottom wall portion 11. The sector hole 13 has a shape corresponding to the circular bottom wall portion 11, and has a top portion 13 p adjacent to the center of the bottom wall portion 11 and an arc 13 q along the outer edge of the bottom wall portion 11. Furthermore, the fan-shaped hole 13 has a circumferential one edge 13m that connects one end in the circumferential direction of the apex 13p and the arc 13q, and a circumferential other edge 13n that connects the other end in the circumferential direction of the apex 13p and the arc 13q. The circumferential direction one edge 13 m and the circumferential direction other edge 13 n extend in the radial direction of the surplus concrete removing bucket 10.

  The fan-shaped holes 13 are arranged at two locations so as to be symmetric with respect to the center portion 15 of the extra-concrete removing bucket 10. Or you may arrange | position to the circumferential direction equal intervals in three or more places as a modification which is not illustrated. Each fan-shaped hole 13 has the same shape and is covered with a plate-like lid member 17. The lid member 17 is made of iron or a material that is not elastically deformed, and is formed in a sector shape corresponding to the shape of the sector hole 13. Strictly speaking, the top portion 13p may not be a point, but may be an arc, a curve other than an arc, or a straight line. Further, the arc 13q does not have to be a strict arc, and may be a substantially arc such as a curve or a straight line other than the arc. The opening area from the circumferential one edge 13m to the circumferential other edge 13n may be a predetermined value included in the range of 15 ° to 45 °. This is because if the opening area is less than 15 °, the amount of extra-concrete concrete taken up is small. Moreover, it is because the pressure of the surplus concrete which acts on the cover member 17 when the surplus concrete removal bucket 10 is lifted will be large when an opening area | region is 45 degrees or more.

  As a modification not shown, the fan-shaped hole 13 may be an approximate triangular hole, a trapezoidal hole, or a rectangular hole. In any case, the through hole for taking in the extra concrete is disposed between the center of the bottom wall portion 11 and the outer edge. Similar modifications are possible for the shape of the lid member.

  As shown in FIG. 4, a pivot 19 is attached to one circumferential edge 13 m of the sector hole 13. One edge in the circumferential direction of the fan-shaped lid member 17 is pivotally attached to the one edge 13 m in the circumferential direction via a pivot 19. The lid member 17 can swing around the pivot 19, is closed by its own weight, and covers the fan-shaped hole 13. Further, when receiving the external force, the lid member 17 is lifted upward from the closed position and opens the fan-shaped hole 13. And the opening degree of the fan-shaped hole 13 becomes large, so that the moving amount | distance upwards is large.

  5 and 6 are developed cross-sectional views showing the thickness of the bottom wall portion of the embodiment, and show a state in which the bottom wall portion is cut along the VV cross section in FIG. 4 and the cut surface is viewed in the direction of the arrow. . The VV cross section is a cross section extending in the circumferential direction. 5 shows the closed position of the lid member, and FIG. 6 shows the opened position of the lid member. Although the opening degree of the lid member 17 changes, it does not swing until it stands vertically, and the opening degree is regulated by the stopper 22. The maximum opening of the lid member 17 is included in the range of 20 ° to 80 °. When the maximum opening degree of the cover member 17 is less than 20 °, the amount of surplus concrete taken in from the fan-shaped hole 13 is reduced. When the maximum opening degree of the lid member 17 exceeds 90 °, it is difficult for the lid member 17 to return to the closed position by its own weight. The stopper 22 is preferably attached and fixed to the inner wall surface of the peripheral wall portion 12 or the upper surface of the bottom wall portion 11.

  Due to the stopper 22, the lower surface of the lid member 17 is always directed downward as shown in FIG. When the upward external force acting on the lid member 17 disappears, the lid member 17 returns to the closed position (FIG. 5) by its own weight.

  As shown in FIG. 2, the bottom wall portion 11 is connected to the lower end of the peripheral wall portion 12 through a rotation shaft 20 at one place on the outer edge of the bottom wall portion 11. As shown in FIG. 2, the bottom wall portion 11 is held at the normal position by the lock mechanism 21 and covers the lower end of the peripheral wall portion 12. However, the bottom wall portion 11 can be pivoted downward about the pivot shaft 20 and can be displaced to a release position described later.

  The pile head processing using the extra concrete removal bucket will be described.

  First, a ground hole is used to create a pile hole in the ground. Next, set the reinforcing bar in the hole. Next, the ready-mixed concrete is transported to the bottom of the pile hole, and the concrete is launched from the bottom of the pile hole to the top of the pile hole. Thereby, a reinforced concrete pile is constructed. Drawing 7 is an explanatory view showing typically the state where the pile head of the reinforced concrete pile was seen from the side. The ready-mixed concrete is placed upward beyond the design top height T of the reinforced concrete pile.

  The connecting portion 18 of the extra concrete removing bucket 10 is connected to the lower end of the Kelly bar 101 and is carried into the reinforcing bar 102. When the bottom wall portion 11 of the surplus concrete removing bucket 10 is pressed against the surplus concrete S, each lid member 17 is pushed up to the open position.

  When the kelly bar 101 is rotated while the bottom wall portion 11 is pressed against the surplus concrete S, the surplus concrete removing bucket 10 rotates clockwise as indicated by an arrow R in FIG. Then, as shown in FIG. 6, with the lid member 17 open, the surplus concrete passes through the fan-shaped holes 13 as shown by the thick arrows and is taken into the surplus concrete removal bucket 10 (FIG. 7). An arrow R is a direction crossing the sector hole 13 from the circumferential one edge 13m to the circumferential other edge 13n.

  In addition, as shown in FIGS. 5 and 6, the upper surface 11 c of the bottom wall portion 11 is formed with an ascending slope that becomes higher from the other circumferential edge 13 n of the sector hole 13 toward the other circumferential direction. For this reason, the other edge 13n in the circumferential direction is formed at the edge, and the surplus concrete S is cut so as to be scooped with a knife.

  When the extra-concrete removal bucket 10 is rotated and gradually pushed down, the uncured extra-concrete concrete S is taken in. When the lower end of the extra-concrete concrete removal bucket 10 reaches the design top height T, the removal of the extra-concrete concrete is completed. . Next, the kelly bar 101 is lifted, and the surplus concrete removing bucket 10 is carried out from the pile head. At this time, since the lid member 17 automatically returns to the closed position, the extra concrete S does not fall from the fan-shaped hole 13 when it is carried out.

  FIG. 8 is a vertical cross-sectional view showing the displacement of the bottom wall portion, where the normal position of the bottom wall portion is indicated by a virtual line, and the release position of the bottom wall portion is indicated by a solid line. The lock mechanism 21 for holding the bottom wall portion 11 in the normal position includes an operation element 23, a flange 24, and an operation rod 25. The operating element 23 is provided on the upper side of the beam 16 (FIG. 1). The flange 24 is provided at a position away from the rotation shaft 20 in the bottom wall portion 11. The operating rod 25 extends vertically from the operating element 23 to the flange 24, the upper end portion of the operating rod 25 penetrates the beam 16, and the lower end portion of the operating rod 25 is bent into, for example, an L shape and engaged with the flange 24. To do. As a result, the bottom wall 11 is suspended from the beam 16 and maintained in the normal position.

  The operation element 23 can be rotated around the operation rod 25. When the operator rotates the operation element 23, the operation rod 25 coupled to the operation element 23 also rotates, and the engagement between the operation rod 25 and the rod 24 is released. As a result, the bottom wall portion 11 is rotated downward to the release position as shown by a solid line in FIG. 8, and the surplus concrete inside the surplus concrete removing bucket 10 is discharged downward.

  When the extra concrete removing bucket 10 is reused, the extra concrete removing bucket 10 may be washed, the bottom wall portion 11 may be returned to the normal position, and the lock mechanism 21 may be applied.

  The extra concrete removal bucket 10 of the present embodiment includes a circular bottom wall portion 11 having a flat lower surface 11d, a cylindrical peripheral wall portion 12 rising from the outer edge of the bottom wall portion 11, and a central axis of the peripheral wall portion 12. A connecting portion 18 for connecting to the rotating Kelly bar 101 so as not to be relatively rotatable, a fan-shaped hole 13 disposed between the center portion 15 and the outer edge of the bottom wall portion 11 and penetrating the bottom wall portion 11, and a peripheral wall portion And a lid member 17 that opens and closes the fan-shaped hole 13. The lid member 17 is connected to the bottom wall portion 11 by a pivot 19 and swings downward to close the fan hole 13 (FIG. 5), and an open position swinging upward to separate from the fan hole 13. (Fig. 6). According to this embodiment, since the bottom wall part 11 has the flat lower surface 11d, the surplus concrete above the design top end height T can be taken in into the interior space of a bucket neatly.

  Further, according to the present embodiment, since the opening degree of the lid member 17 is regulated by the stopper 22 provided on the bottom wall portion or the peripheral wall portion, the lid member 17 is not opened too much, and the lower surface of the lid member 17 is always open. Orient downward. Therefore, the lid member 17 quickly returns to the closed position by its own weight.

  In addition, according to the present embodiment, the upper surface 11c of the bottom wall portion 11 is formed to have a climbing gradient that increases with increasing distance from the other circumferential edge 13n of the fan-shaped hole 13 as shown in FIGS. A portion including the other circumferential edge 13n is formed in an edge-shaped cross section like a single-edged knife. Therefore, the surplus concrete S can be scraped off so as not to disturb the concrete having a design top height T or less.

  Moreover, according to this embodiment, the surplus concrete intake is formed in a fan shape. That is, the fan-shaped hole 13 is a surplus concrete intake. The fan-shaped hole 13 is defined by a top portion 13p adjacent to the center portion 15 of the bottom wall portion 11 and an arc 13q adjacent to the outer edge of the bottom wall portion 11, and the center portion 15 of the bottom wall portion 11 and the bottom wall portion 11 It is arrange | positioned between outer edges. The lid member 17 is connected to the circumferential edge 13m of the fan-shaped hole 13 by the pivot 19 so that when the surplus concrete is taken into the fan-shaped hole 13, the surplus concrete lifts the lid member 17 upward. The lid member 17 is set to the open position. Therefore, the surplus concrete can be efficiently taken into the fan-shaped hole 13.

  Further, according to the present embodiment, as shown in FIG. 8, the bottom wall portion 11 is attached to the lower end of the peripheral wall portion 12 so as to be displaceable, and the normal position covering the lower end of the peripheral wall portion 12 and the release away from the lower end of the peripheral wall portion 12. Selective to position. Thereby, the surplus concrete S taken in the internal space of the surplus concrete removal bucket 10 can be discharged | emitted rapidly.

  In particular, according to the present embodiment, the bottom wall portion 11 is pivotally connected to the lower end of the peripheral wall portion 12 via the rotation shaft 20 at one place in the circumferential direction of the outer edge of the bottom wall portion 11. The lower end of the peripheral wall portion 12 can be quickly opened.

  Although the embodiments of the present invention have been described with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The surplus concrete removing bucket according to the present invention is advantageously used in civil engineering.

10 Extra concrete removal bucket 11 Bottom wall,
11c upper surface, 11d lower surface, 12 peripheral wall,
13 Fan-shaped hole (excess concrete intake), 13m circumferential edge,
13n circumferential edge, 13p top of fan hole,
13q arc of fan hole, 15 center, 16 beams,
17 lid member, 18 connecting part, 19 pivot,
20 rotating shaft, 21 locking mechanism, 22 stopper,
23 operator, 24 閂, 25 operating rod,
101 Kelly Bar, 102 Reinforcing Bar
T Design top edge height.

Claims (8)

A bucket for removing surplus concrete from the pile head of a cast-in-place concrete pile,
A circular bottom wall having a flat lower surface;
A cylindrical peripheral wall portion rising from the outer edge of the bottom wall portion;
A erection member erected on the peripheral wall,
A connecting portion provided on the erection member and connected to a rotating shaft that rotates about a central axis of the peripheral wall portion so as not to be relatively rotatable;
An extra-concrete intake port disposed between the center and the outer edge of the bottom wall, and penetrating the bottom wall;
A lid member that is disposed in the internal space of the peripheral wall portion and opens and closes the extra-concrete concrete intake port;
The lid member has one circumferential edge and the other circumferential edge, and the one circumferential edge is connected to the bottom wall portion on one circumferential side of the extra-concrete concrete intake, and the other circumferential edge Is swingable in the vertical direction, and swings downward to close the extra-concrete intake, and closed position swings upward to separate from the extra-concrete intake. An extra concrete removal bucket that can swing between them.   The extra-concrete concrete removing bucket according to claim 1, wherein a plurality of extra-concrete concrete intakes are arranged at intervals in the circumferential direction.   The extra-concrete concrete removing bucket according to claim 1 or 2, wherein the one circumferential edge of the lid member is connected to the bottom wall portion via a pivot.   The extra-concrete removal bucket according to any one of claims 1 to 3, wherein the opening degree of the lid member is regulated by a stopper. The surplus concrete removal according to any one of claims 1 to 4, wherein the upper surface of the bottom wall portion is formed to have a climbing gradient that increases with increasing distance from the other circumferential edge of the surplus concrete intake. bucket. The surplus concrete intake is a fan-shaped hole defined by a top portion adjacent to the center portion of the bottom wall portion and a substantially arc adjacent to the outer edge of the bottom wall portion,
The extra-concrete concrete removing bucket according to any one of claims 1 to 5, wherein the one circumferential edge of the lid member is connected to one circumferential edge of the fan-shaped hole.   The bottom wall is attached to a lower end of the peripheral wall so as to be displaceable, and is selectively set to a normal position covering the lower end of the peripheral wall and a release position away from the lower end of the peripheral wall. The extra-concrete concrete removal bucket in any one of 6.   The surplus concrete removing bucket according to claim 7, wherein the bottom wall portion is rotatably connected to a lower end of the peripheral wall portion at one place in a circumferential direction of an outer edge of the bottom wall portion.

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