JPH07195356A - Top end level cutter of concrete - Google Patents

Abstract

PURPOSE:To provide a top end level cutter capable of accurately cutting the periphery of the anchor bolt of the top end of foundation concrete within a short time and imparting good appearance after cutting. CONSTITUTION:A rotary part 12 is provided to the lower end of the shank 11 attached to a rotary tool such as a drill and the top end surface of concrete is cut by the cutting blades 14,15 provided to the rear surface of the rotary part 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a top level cutter mainly used for foundation concrete of buildings.

[0002]

2. Description of the Related Art When a frame or pillar is installed on the top of a foundation concrete and fixed by anchor bolts protruding from the concrete, there is no inconvenience on the top of the concrete before the installation of the frame or the like. Need to check.
If, as a result of the measurement, there is such unevenness, a spacer or the like is inserted in the lower part to correct the frame so that it is horizontal or vertical, but there is a limit to the adjustment by the spacer, and the anchor bolt It becomes necessary to reduce the level by cutting the periphery.

For example, in FIG. 5, a frame set (3) (3) consisting of a vertical frame (1) made up of C channels and a horizontal frame (2) made up of C channels is installed at the top end of a foundation concrete (4). It is installed on the vehicle and fixed by an anchor bolt (5) protruding from the top end. Vertical frame (1)
A horizontal end plate (6) is welded to the lower end of the, and the anchor bolt (5) is inserted into a bolt hole (not shown) formed in this end plate (6) and tightened with a nut (not shown). I'm trying to fix it. In this case, when it is necessary to lower the level around the anchor bolt (5), the top end of the concrete (4) is shaved by an area where the end plate (6) can be installed. Conventionally, the cutting of the top end surface has been manually performed with a chisel or the like.

[0004]

As described above, in the prior art, since the top end of concrete was sequentially scraped off with a chisel or the like to adjust the unevenness, it takes time to perform the work, and it is necessary to cut the ground accurately. Was difficult. Also,
There was a drawback that the appearance after scraping was unsightly and the impression given to the construction owner was bad.

In view of the above-mentioned conventional drawbacks, the present invention is capable of accurately cutting the periphery of the anchor bolt of the top end of the foundation concrete in a short time and having a good appearance after the cutting. It is intended to provide.

[0006]

In order to solve the above-mentioned problems, according to the present invention, a shank for attaching to a rotary tool such as a drill, a disc-shaped rotating portion provided at the tip of the shank, and a rotating portion of the rotating portion are provided. In addition to the cutting blade attached to the back surface, an insertion hole for an anchor bolt protruding from the top end of the concrete is formed in the central portion of the back surface of the rotating portion.

In the above, it is conceivable to install a plurality of linear cutting blades at intervals in the circumferential direction so as to traverse the back surface of the rotating portion.

Further, a cutting blade is attached to the line passing through the center of rotation of the rotating portion by shifting the phase forward in the rotating direction of the rotating portion, or the front side surface in the rotating direction of the cutting blade is inclined backward. It is conceivable to provide a clearance angle.

[0009]

[Operation] While attaching the shank to a rotating tool such as a drill, inserting the anchor bolt into the insertion hole of the rotating part and cutting the concrete top end surface with the cutting blade while rotating the rotating part, The level can be set accurately and quickly.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1 and 2, (11) is a cylindrical shank, and a disc-shaped rotating portion (12) is integrally formed at the lower end of this shank (11). Similarly, a shaft (13) for attaching to a chuck of a rotary tool such as a drill is integrally formed at the upper end of the shank (11) so as to project upward. An anchor bolt insertion hole (10) is formed in the center of the rear surface of the rotating portion (12), and the upper end of this insertion hole (10) allows the anchor bolt to be inserted with a margin. , Extended to the inside of the shank (11).

On the back surface of the rotating part (12), the rotating part (1
2) Four cutting edges (14) arranged in the direction crossing the back surface
(15) are attached at equal intervals in the circumferential direction. Of these cutting blades (14) (15), a pair of cutting blades (14) (14) symmetrically arranged in the diameter direction of the rotating part (12).
Is from the outer periphery of the disc part (12) to the middle part, and the other cutting edge (15) is from the middle part of the disc part (14) to the inner peripheral surface of the anchor bolt insertion hole (14). It is mounted so as to be displaced in the radial direction so as to cover the entire area from the peripheral surface to the outer peripheral surface. Furthermore, these cutting edges (14)
The phase (15) is attached to the line L passing through the center of rotation (P) of the rotating part (12) with the phase shifted by a distance S in the front in the direction of rotation shown by the arrow in FIG.

FIG. 3 shows the mounting structure of the cutting blades (14) and (15). The cutting blades (14) and (15) have a rectangular cross section, and the rear surface ( It is embedded in and attached to the rotating part (12) so as to project in a triangular shape from 12a). At this time, the front surface portion (16) of the cutting blades (14) (15) in the rotational direction indicated by the arrow in FIG. 3 is inclined so that its tip is inclined rearward in the rotational direction, and with respect to the perpendicular line Q. It forms a clearance angle of angle α.

FIG. 4 shows a method of cutting a concrete crown using the above cutter. As shown in this figure, insert the shaft (13) at the top of the shank (11) into the drill (1
8) Attach the anchor bolt (5) to the rotating tool such as 8) and try to cut the periphery, and insert the anchor bolt (5) into the insertion hole (10).
It is possible to cut the peripheral portion of the anchor bolt (5) into a circular shape by inserting it into and rotating the rotating portion (12) with this drill (18). At this time, insert hole (10)
By making the gap between the inner peripheral surface of the anchor bolt (5) and the outer peripheral surface of the anchor bolt (5) as small as possible, it is possible to cut to the vicinity of the root portion of the anchor bolt (5).

In the above cutting, as shown in FIG. 2, the cutting blade (14) is attached to the front in the rotational direction with a phase shift, so that depending on the angle of the cutting blade (14) during rotation,
The scraped off concrete powder is effectively discharged to the outer periphery of the disk portion (12). In addition, since the clearance angle α is formed, the cutting edges (14) and (15) do not bite into the concrete surface, and it is possible to surely cut little by little while checking the level of the concrete crown. There is.

[0015]

As described above, according to the present invention, with the anchor bolt inserted in the anchor bolt insertion hole,
By rotating the rotating part with a rotating tool, you can easily cut the circumference of the anchor bolt and adjust the level, and the finish is better than when manually cutting with a chisel as in the past. There is an effect that it is possible to perform a good and accurate level adjustment in a short time. Further, as described above, by arranging the cutting blades in front of the rotational direction with a phase shift, it is possible to effectively discharge the cut concrete powder in the outer peripheral direction, and also to form a clearance angle in the cutting blades. By doing so, it is possible to cut the concrete surface little by little while checking the level.

[Brief description of drawings]

FIG. 1 is a side view of a level cutter of the present invention.

FIG. 2 is a rear view of the rotary unit of the level cutter.

FIG. 3 is an enlarged side view of a disk portion showing an enlarged cutting edge portion.

FIG. 4 is a perspective view showing a work situation of cutting a top end of basic concrete using the level cutter of the present invention.

FIG. 5 is a perspective view of a basic concrete and a main part of a framework attached to the concrete.

[Explanation of symbols]

 (11) Shank (12) Disc part (14) Cutting edge (15) Cutting edge (16) Cutting edge front surface

Claims (4)

[Claims] 1. A shank for attaching to a rotary tool such as a drill, a disc-shaped rotating portion provided at the tip of the shank, and a cutting edge attached to the back surface of the rotating portion, and the center of the back surface of the rotating portion. The top end level cutter of concrete is characterized in that an insertion hole for an anchor bolt protruding from the top end of concrete is formed in the part. 2. The concrete top level cutter according to claim 1, wherein a plurality of linear cutting blades are attached at intervals in the circumferential direction so as to traverse the back surface of the rotating portion. 3. A concrete top end level cutter according to claim 2, wherein a cutting edge is attached to the line passing through the center of rotation of the rotating part so as to shift the phase forward of the rotating direction of the rotating part. . 4. A top end level cutter made of concrete, characterized in that the front side surface of the cutting blade in the rotational direction is inclined rearward to provide a clearance angle.