JPH03213205A - Anchor hole positioning method for core drill and installing method thereof and marking scale - Google Patents

Abstract

PURPOSE:To facilitate direct anchor hole positioning on a floor surface by drawing a circular arc, whose radius is a stroke of a core drill, about the center of a drilled hole by a marking scale and setting a crossing point of the circular arc with a straight line from the center of the drilled hole as an anchor hole position. CONSTITUTION:A slider 14 is slid on a bar-shaped main unit 12 to be fixed to a scale, where an index 22 agrees with a stroke L of a core drill 26, by tightening a screw 20. A protrusion 16 is placed in a drilled center hole 30 where marking is given on a surface to be worked on a concrete surface, and a circular arc 34 is marked by a marking means 24 by turning a marking scale 10, and when a straight line 36 is drawn, a crossing point 38 is set as an anchor hole position. An anchor bolt is fixed by drilling an anchor hole to the crossing point 38 by a hammer drill or the like, and the core drill 26 is arranged by mounting a stud bolt to the anchor bolt so that the stud bolt may extend from a mounting hole of a base 40.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a method for positioning an anchor hole formed in a concrete wall or the like for fixing the base of a core drill;
The installation of core drills concerns methods and marking scales.

[Conventional technology]

Core drills are widely used to drill circles of a predetermined diameter into concrete walls, beams, floors, humid pipes, etc. (hereinafter referred to as concrete floor surfaces). A core drill includes a support arm on which a core bit is supported, a support column to which the support arm is slidably attached, and a base to which the support column is fixed. In addition, a hole is formed approximately in the center of the base to attach an anchor bolt (installation is done by bolt), and the base is installed on the concrete floor using this anchor bolt.

If the center of the core bit deviates from the drilling center, an off-center hole will be formed, and in subsequent processes such as piping work, for example, unreasonable piping may be forced, resulting in deformation or bending of the pipe.
There is a risk that it will be damaged, making post-processing difficult.

In order to perform the correct drilling, the center of the core bit must coincide with the drilling center on the concrete floor surface, and for this the core drill must be installed in position, and the positioning of the anchor hole is an important factor. becomes.

By the way, 2. Normally, the installation of a core drill is carried out as follows.

First, this is done by drawing two wooden lines on the concrete floor that intersect at the center of the hole to be drilled (drilling center) at a quick start point. That is, a cross (+) marking line (mark) is drawn at the center of the perforation.

Then, the core drill is tilted so that the wheels at the rear end of the base are in contact with the ground, and the core drill is transported to the planned drilling position using the wheels.

Here, it is assumed that the core bee 21 having a diameter corresponding to the hole to be drilled has already been attached to the support arm.

Return the core drill to an upright position and place the base on the concrete floor. Then, adjust the position of the base so that the core bit is centered at the center of the marked hole. The distance between the center of the core drill ( ) and the approximate center of the hole attached to the base is a constant value unique to each core drill and is called the stroke of the core drill.

The position separated by the stroke L from the marked drilling center, that is, the anchor hole setting position, is confirmed through the hole for base installation with a tape measure and ruler, and marked on the concrete floor surface with a punch felt pen, etc. .

The base is moved aside so that it does not interfere with drilling the anchor hole. Then, draw a straight line on the concrete floor connecting the anchor hole and each mark of the center of the drilling, and use a hammer drill or the like to drill the anchor hole using the anchor hole mark as a guide.

After fixing the anchor bolt into the anchor hole.

Insert the stud bolt into the anchor bolt as deep as possible and secure it, then return the base to its original position, and at this point screw the nut onto the upper end of the stud bolt extending through the hole with a washer in between. So, Natsuto,
It is not fixedly tightened to the stud bolt, and slight movement of the base is allowed.

There is a display at the rear end of the base that indicates the center position.
The position of the base is adjusted by rotating the base around the stud bolt so that it is aligned in a straight line on the concrete floor surface. A nut is then securely tightened onto the top end of the stud bolt and the base is installed onto the concrete floor.

Since the mounting hole is formed in the shape of a long hole, the positional deviation of the base in one longitudinal direction can be adjusted by moving the base back and forth while inserting the stud bolt into the mounting hole.

In this way, by determining the setting position of the anchor bolt from the center of the drilling and aligning the display at the center of the rear end of the base with a straight line on the concrete floor surface, the center of the core bit will theoretically be centered at the center of the drilling, and the base , which means that the core drill is installed accurately.

After installing the core drill, the motor is started, the co-7 bit is rotated, and the support arm is lowered along the column with the core bit, so that a hole equal to the outer diameter of the core bit is drilled into the concrete floor surface. It is formed.

[Problem to be solved by the invention]

As mentioned above, in the known method, on the concrete floor surface,
It is necessary to mark the anchor hole, and since the base is attached through the hole, this marking cannot be done easily and is likely to be misaligned.

For positioning the anchor hole, the base is brought to the centering position of the core bit. After the anchor hole is positioned, the base is moved aside for drilling the anchor hole, and then returned to the predetermined position (installation position 21) for the original positioning (installation) after drilling the anchor hole. It will be done. In this way, it is necessary to move the base in order to position the anchor hole before the actual positioning. However, moving the base before the original positioning is itself complicated, and the core bit attached to the base is quite heavy, causing fatigue.

Also, when installing a core drill on walls or beams.

It is not possible for a human operator to support the core drill while marking, so the work must be done jointly by two people.

One object of the present invention is to provide a core drill anchor hole positioning method and a core drill installation method in which the anchor hole can be set accurately without moving the base.

Another object of the present invention is to provide a marking scale for quickly and easily setting anchor holes.

[Means to solve the problem]

For the above purpose, according to the core drill anchor hole positioning method of the present invention, a circular arc having a radius of the stroke of the core drill is drawn around the drilling center of the core bit using, for example, a marking scale. Then, by drawing a straight line from the center of the drilling of the core bit, the intersection with the circular arc can be determined as the position of the anchor hole.

Further, the marking scale is constructed by attaching a slider to a rod-shaped main body having a scale, and a protrusion is attached to one end of the rod-like main body. The slider is provided with an index aligned with the scale and a marking means for marking an arc whose radius is the length indicated by the index.

〔Example〕

The present invention will be described in detail below with reference to the drawings.

As shown in FIG. 1, the marking scale l according to the present invention
O includes a rod-shaped body 12 and a slider 14, and a protrusion tS is attached to one end of the rod-shaped body, for example, the left end, by explosive bonding or the like, and a scale 1 is formed with the position of this protrusion as the origin.
8 is written on the surface of the rod-shaped main body 12. The protrusion 16 is
It is sufficient that the core bit 28 is placed correctly at the center of the hole, and is not limited to a triangular shape as shown.

The slider 14 has a shape that can hold the rod-shaped main body 12 and slide on the rod-shaped main body, and is, for example, approximately U-shaped with a portion of the front surface cut out. A stopper screw 20 is screwed onto the slider 14, for example at the center thereof,
Slider by tightening the stopper screw! 4 is
5 indexes fixed on the rod-like body 22.
A scribing means 24 is provided on each slider at the center of the slider 14.

The index 22 is a scale on the rod-shaped body! It is sufficient to indicate the position of the slider 14 by aligning the two marking means 24 in the shape of a triangle shown in the figure, and it is not limited to the triangular shape shown.
For example, it is formed from heat-treated steel protrusions. Since the scribing means 24 is located in alignment with the index 22, an arc with a radius of the length indicated by the index is formed with the protrusion 18 at the left end as the center. When doing so, the lengths of the two scribing means protrusions are determined so that the tips of the scribing means 24 and the protrusion 16 are located at the same level.The index 22. The scribing means 24 is usually located at the center of the slider l4 from the top of the appearance. provided, but not limited to the center.

The anchor hole of the core drill is positioned by the marking scale IO having the above configuration as follows.

First, as shown in FIGS. 2(A) and 2(B), the slider 14 is slid on the rod-shaped body 12 so that the index 22 indicates the scale 18 that corresponds to the stroke L of the core drill 2B, and then the stopper The position of the slider is fixed by tightening the screw 20. A drilling center 30 of the core bit is previously marked on a workpiece such as a concrete floor to be drilled by the core bit of the core drill, and a protrusion 16 at the left end of the rod-like body is placed at this drilling center. When the scribing scale 10 is rotated about the protrusion 16, a circular arc 34 having a radius of the stroke L is scribed on the concrete floor surface by the scribing means 24. Then, if a straight line 3B intersecting the two circular arcs 34 is drawn from the drilling center 30 of the core bit, the intersection 38 will be the position of the anchor hole.

In this way, in this invention, the stroke L of the core drill
The position of the anchor hole can be easily determined by a simple operation of drawing a circular arc 34 with radius around the core bit drilling center 30 and drawing a straight line 38 that intersects one circular arc from the core bit drilling center.

In the known method, the marking of the anchor hole is done through the hole when the base is attached, whereas in the present invention, the marking of the anchor hole is done when the base 40 is attached without going through the hole. It is done directly on the surface. Therefore, in this invention, the positioning of the anchor hole is
It can be done quickly and easily, and positional deviations are unlikely to occur.

An anchor hole is drilled at the obtained intersection 38 using a hammer drill or the like, and the anchor bolt is fixed in the anchor hole. The core drill 26 is installed on the base by rotating the base 40 around the anchor bolt so that the display 42 at the center of the rear end of the base is on the straight line 36. When the position of the base 40 is fixed by tightening the nut to the stud bolt at a position where the 0 display 42 whose position is adjusted is aligned with the straight line 3B, the installation of the core drill 2B is completed.

In this way, the base 40 does not take any part in setting the anchor hole, and there is no need to move the base 40 before the original positioning. Therefore, the movement of the base 40 for setting the anchor hole is omitted, and the base The operator is relieved from the fatigue associated with complicated movements. Additionally, core drills can be installed on walls and beams by a human operator.

Then, if you extend straight line 3B enough, this straight line will become
The base 40 can be accurately positioned simply by aligning the mark 42 at the center of the rear end of the base.

In this way, the anchor hole and base positions can be determined accurately without relying on experience or intuition, and the installation of the core drill 26 can be done quickly and easily. It is possible to perform drilling work as accurately as that of a professional.

Although one circular arc 34 can be easily drawn using the scribing scale 1G, it is also possible to draw an arc using something other than a scribing scale, such as a regular scale with a needle-like protrusion on one end and a felt-tip pen on the other end. You can.

Moreover, the above-mentioned marking scale 10 is structurally simple and can be produced at low cost. Also, it has a similar feeling to a compass,
The arc of stroke L can be easily marked.

Note that the stroke L of the core drill 2B is the same as the stroke L of the core drill 2B.
The diameter of the core bit is not proportional to the diameter of the core bit, and the core bit is usually divided into three to four groups depending on the diameter of the core bit. Also,
It varies somewhat depending on the manufacturer.

Therefore, if a number of marks equal to the number of groups of stroke L are displayed on the scale 18 in advance, the slider 14
positioning can be done quickly. FIG. 3 shows an embodiment in which four marks 42 are provided at positions corresponding to the stroke L. The marks 42 are numbered as shown in the figure, and depending on the diameter and type of the core bit 28, which mark 42 has the index 20 If it is clearly indicated with an adhesive sticker, instruction manual, etc. whether the stroke L should be matched, the stroke L can be set accurately without having to accurately memorize the stroke L value specific to each core drill 28.

Four marks 42 may be printed on one adhesive sticker and this adhesive sticker may be attached to the rod-shaped body 12.
In the embodiment, the shape is triangular, but it may be displayed in other ways, for example, in the shape of an arrow or colored.

The above-mentioned embodiments are for illustrating the present invention, and are not intended to limit the present invention in the same way, and all modifications and modifications within the technical scope of the present invention are also included in the present invention. Needless to say.

〔Effect of the invention〕

As described above, according to the anchor hole positioning method of a core drill according to the present invention, the anchor hole can be marked directly on the concrete floor surface without going through the hole, so the anchor hole can be positioned quickly. , can be easily done.

There is no need to move the base before it is properly positioned, the operator is freed from fatigue caused by moving the base, and the core drill can be installed on walls or beams by one person.

Furthermore, by aligning the mark at the center of the rear end of the base with a straight line intersecting the circular arc, the base can be accurately positioned and the core drill can be installed quickly and easily, even by a general operator with low skill level.

The marking scale having the above structure has a cylinder structure and can be produced at low cost. Further, the arc of the stroke L can be easily marked with a feeling similar to a compass.

[Brief explanation of drawings]

FIG. 1 is a front view of a marking scale according to the present invention, and FIGS. 2 (^) and (B) are process schematic diagrams showing a method for positioning an anchor hole using a marking scale and a method for installing a core drill. FIG. 3 is a partially enlarged front view of a marking scale according to another embodiment. ! 0: Marking scale! 2: Rod-shaped body, 14 Nislider, 18 = protrusion, 18: Scale, 20: Stopper screw,
22: Index, 24: Marking means, 28: Core drill, 28: Core bit, 30: Drilling center (center of core bit), 34: Arc, 36: Straight line, 38: Intersection, 4
0: Core drill base, 42: Mark, L: Core drill stroke.

Claims (5)

[Claims] (1) A core drill anchor hole positioning method in which an arc with the radius of the core drill stroke is drawn around the core bit drilling center, and the anchor hole position is the intersection point with a straight line drawn from the core bit drilling center. (2) Mark the drilling center of the core bit, draw an arc around the core bit drilling center with the radius of the core drill stroke, and fix the anchor bolt by setting the intersection with the straight line drawn from the core bit drilling center as the anchor hole position. How to install a core drill. (3) Mark the drilling center of the core bit, draw an arc around the core bit drilling center with the radius of the stroke of the core drill, set the anchor hole position at the intersection with the straight line drawn from the core bit drilling center, and fix the anchor bolt. A method of installing a core drill in which the base is fixed by aligning the display at the center of the rear end of the core drill's base with a straight line from the core bit's drilling center. (4) A rod-shaped body with a scale marked on it and a protrusion attached to one end, and a slider slidably attached to the rod-shaped body, with an index aligned with the scale and indicating the position of the slider, and an index centered on the protrusion. A marking scale is provided on the slider, and is capable of marking an arc whose radius is the length indicated by the index. (5) The marking scale according to claim 4, wherein a mark indicating a predetermined length is displayed on a scale of the rod-shaped main body.