JPH0686054B2 - Drill for drilling concrete and its drilling method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a drill for concrete drilling, which is used for drilling work when it is necessary to drill on the wall surface or floor surface of a concrete building when performing piping work for refrigeration equipment and the like. And the perforation method.

[0002]

2. Description of the Related Art Generally, when drilling a concrete wall or floor of a building, a dedicated electric drill spindle equipped with a hollow cylindrical drill having a cutting edge is used to rotate the drill. Through holes of desired size are drilled in concrete. This situation will be specifically described with reference to FIG. 5. At the work site, as shown in the figures, first, the concrete wall 4
The cutting edge 2 of a hollow cylindrical drill 1 having a cutting edge 2 at the predetermined position, and the hollow mounting portion 3 of the drill 1 is mounted on the spindle of a dedicated electric drill (not shown), Immediately before the punching of the concrete wall is completed by rotating the cutting blade, an assistant is placed, though not shown, to receive the punched concrete mass 4'using a stepladder or the like.

[0003]

However, as a practical problem, the following inconvenience occurs at the drilling work site. The enumeration is as follows: Since the placed assistant holds the punched concrete block on the stepladder, it sometimes loses the sense of balance, falls, or accidentally hits the concrete block directly on the body,
A personal injury such as injury occurred. B: Due to the punched concrete block, not only the assistant at the drilling site but also the passerby could be injured in the head,
Or, an accident occurred that damages nearby objects. C: Immediately before cutting the concrete block, the rotation of the drill is temporarily stopped, and the assistant is always placed below to remove the concrete block while supporting it. Therefore, it is necessary to secure an assistant and save labor and work. It is inferior in efficiency, and has the drawbacks that workability is not sufficient, not to mention safety measures. The present invention is intended to solve the drawbacks of deficiency, and its purpose is to prevent personal injury due to direct drop of concrete lumps during drilling work, and to assist an assistant required at the work site. It is intended to reduce the number of arrangements of the above to save labor and improve work efficiency.

[0004]

DISCLOSURE OF THE INVENTION According to the present invention, a drill having a bottomed cylindrical shape, one end of which is opened and the other end of which is provided with a hollow mounting portion 3 is formed in a plurality of cutting blades 2 and has a bottomed cylindrical shape. a 1, wherein the bottom portion includes a return device 6 ₂ on one side,
The locking device 6 ₃ to the other side, with respective intermediate retractor 6 reel ₆₁ is disposed wound cord-like member 9 is installed in, twist near the end of the string-like body Construction of a drill for concrete drilling, characterized in that the return 10 is connected, and a step of stamping and fixing an anchor bolt at a predetermined drilling position on a concrete floor surface or wall surface , and a string shape from a winding device in the drill Anchoring the body to the anchor bolt through untwisting and driving the drill to the floor
A step of abutting against a surface or a wall surface to perforate it, and a step of removing the cord-like body from an anchor bolt stamped on the concrete that has been cut by the drill and hung on the cord-like body after completion of the perforation And a step of retracting the drill from the floor surface or the wall surface while accommodating the cord-shaped body in the winding device.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific constitution of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows the concrete according to the present invention.
In a side sectional view of an essential part showing an embodiment applied to the floor surface of a chair, the same parts as those of the conventional type are designated by the same reference numerals, and the structural features of the present invention will be described. Then
A bottomed cylindrical drill having a cutting blade 2 and a hollow mounting portion 3 fixed to the other end is a leg portion formed on the inner wall of the bottomed portion of the drill 1. The winding device 6 described later is fixed. Although not necessarily required, 7 is a partition wall for holding the winding device and is fixed to the fixing portion 8. 9, the string-like body formed of the loaded reel ₆₁ wound on the wire or synthetic resin fibers made of the band to the winding device 6 to be described later, 10 untwisted exhibits a tubular,
As shown in (1) of FIG. 2 showing the side surface, both ends are formed in a U shape, and locking pins P are fixed to the respective openings,
A ball bearing b is formed in the middle so that both sides are rotatable with respect to each other, and the end face thereof is shown in (2) of the same figure. 11 is
As shown in FIG. 3A, a plan view, a side view in FIG. 2B, and a bottom view in FIG. 3C show a tubular shape having an engaging piece L at the tip. With the anchor bolt, a plurality of grooves t are formed in the tubular portion toward the bottom, and inside each of the grooves t, a sleeve T formed in a side trapezoidal shape is fitted so that the bottom thereof slightly protrudes. When it is worn and cast into concrete, the sleeve T is embedded in the tubular portion and firmly fixed to the concrete. 4 is a modification of the untwisting 10 and the anchor bolt 11 described above. A nut N is formed on one side (right side) of the untwisting 10, and a screw S is fixed to the nut. It is formed so as to be screwed into a female screw S ′ engraved on the head of 11, and thus the work of fixing the untwisting 10 and the anchor bolt 11 is simplified. Next, described take-up device 6 together with FIG. 1, 6 _1, with a reel wound around the string-like body 9, the reel is rotatably loosely fitted on the frame B exhibiting a U-shaped Has been done. 6 _2, the return device spiral return spring which is disposed on one side of the frame body B is loaded, the return spring, the outer end is fixed to the frame body B, the inner end of the Reel 6
Be fixed to one of _a rotation shaft, it gives a predetermined torque when being stretched string-like body 9 which is wound the reel ₆₁ wound, automatically based on the position and the cord-like member is released It works to rewind. 6 _3, wherein the lock device fixed to the other rotating shaft reel _61, when the string-like body 9 is rapidly Koin receives the rotation of the reel _61, instantly by the centrifugal force acting axial restraint to stop, intended to act to stop the stretching of the string-like body 9 which is wound, the winding winding device 6,
As shown in FIG. 1, it is fixed to the plate body passed to the bottomed leg portion 5.

[0006]

The present invention has a ridge structure. Next, the operation and effect based on the structure will be described together with the embodiment of the present invention. First, an anchor is provided at a predetermined position on a desired floor surface of a concrete building. Bolt 11 is engraved,
Next, the winding device 6 is attached to the engaging piece L of the anchor bolt 11.
The reels 6 string-like body 9 wound in _1, bear the tip through a 10 untwisted, in this state, attached to the drill 1 to a spindle of a dedicated electric drill (not shown), the cutting blade 2
To cover the engagement piece L of the engraved anchor bolt as a center, and drive the drill in this state to start piercing. During the piercing, water is continuously poured into the drill 1 from the mounting portion 3. and turned by a, the thus to scattering of the concrete fines in perforation and abrasion of the concrete 4 of the cutting blade 2, so as to prevent both. Drilling approaches the end, 'Ya is outburst fall, the concrete mass 4' concrete mass 4 of the portion for the wire material 9 is pulled abruptly instant by the weight of, the rotation of KyuMadoka of the reel _61, the and rotation stop instantaneously operated locking device 6 ₃ by centrifugal force, the concrete mass 4 by the string-like body 9 'is hung as shown in FIG. 1 illustrated. Finally, the concrete block 4'in this state
It is only necessary to remove the string-like body 9 from the engaging piece L of the anchor bolt 11 engraved in and to remove the concrete block 4 '. According to the present invention, as described above, concrete
It is only necessary to engrave the anchor bolt 11 at a predetermined position on the floor surface, and to tie the engaging piece L with the string-like body 9 extended from the winding device 6 built in the drill 1 through the untwisting 10. Since the drilling operator does not need to consider the risk of dropping the concrete block 4'when the drilling is completed, fatigue is reduced and efficient work can be performed, while the auxiliary block for receiving the concrete block 4'is assisted. who also, since the left the concrete mass is suspended from at drilling completion, less risk, and wanted to be removed with a small number of people, it can be expected excellent effects that can sufficiently achieve the object of the present invention plant life . As shown in FIG. 4, a screw S is attached to one of the untwisted portions 10 and a female screw S ′ is screwed onto the screw S at the top of the anchor bolt 11.
The one with the structure formed is to be appropriately used depending on the diameter of the hole to be drilled and the thickness of the concrete wall,
Since it suffices to simply tie the tip of the string-like body 9 to the locking pin P of the anchor bolt 11, this allows quicker work than the above-described attachment of the string-like body, and the work is completed more efficiently. At the time of removal, the nut N has been rotated, and the anchor bolt 11 is discarded.

[Brief description of drawings]

FIG. 1 is a side sectional view of an essential part showing an embodiment of the present invention,

FIG. 2 (1) is a side view of untwisting, (2) is both end views thereof,

3 (1) is a plan view of an anchor bolt, (2) is a side view, (3) is a bottom view, FIG.

FIG. 4 is a side view showing a modification of the anchor bolt and untwisting,

FIG. 5 is a side view of an essential part showing a conventional type.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 drill 2 cutting blade 3 attachment part 4 concrete floor or wall 4'concrete lump 5 leg part 6 winding device 6 ₁ reel 6 ₂ return device 6 ₃ locking device 7 partition wall 8 fixing part 9 cord body 10 twisting back 11 anchor bolt B Frame b Ball Bearing L Engaging Piece P Locking Pin S Screw S'Female Thread T Sleeve t Groove

Claims (2)

[Claims] 1. A mounting portion 3 which is open on one side and is hollow on the other side.
A drill 1 having a bottomed cylindrical shape, the open end of which is formed on a plurality of cutting blades 2, the bottomed portion including:
A return device 6 ₂ on one side, the locking device 6 ₃ on the other side,
The reels 6 ₁ each provided with the cord 9 wound in the middle thereof
1. A drill for concrete drilling, characterized in that a winding device 6 in which is provided is installed, and a twisting back 10 is connected near the tip of the string-shaped body. Wherein the concrete steps of the anchor bolt to a predetermined punching position of the floor surface or wall surface embossing fixed, the step of anchoring the anchor bolt through the untwisted string-like body from the winding device in a drill And drive the drill to the floor
A step of abutting against a surface or a wall surface to perforate it, and a step of removing the cord-like body from an anchor bolt stamped on the concrete that has been cut by the drill and hung on the cord-like body after completion of the perforation A step of accommodating the string-like body in the winding device and separating the drill from the floor surface or the wall surface.