JPH10180744A - Core drill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a core drill which facilitates the work to prevent a core from falling down which is disengaged from a surrounding concrete structure at the completion of drilling of hole. SOLUTION: A connector 34 interconnecting the output axis of a core drill body and a core pit has an axial hole 35 for feed of water and a feed water guide 39 provided with a guide groove 38 for passage of a feed water hole 36 and a wire 37 is inserted into the hole 35 so as not to rotate and sealed. A sleeve 44 is mounted rotatably to the connector 34 so as to close almost of an opening 33 together with a reel 46 and the wire 37, which is taken out through the opening 33 from the groove 38, is connected to the reel 46 so that the wire 37 is rolled round the sleeve 44 by the rotating operation of the reel 46.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for drilling holes in concrete structures such as fume tubes, drilling holes in floors of buildings and other concrete structures, and collecting core samples from rocks and concrete structures. Core drill.

[0002]

2. Description of the Related Art As shown in FIG. 1, a core drill is generally provided with a base 1, a support 3 standing upright from the base 1, and a rack 2 provided vertically on one side, and mounted on the support 3 so as to be able to move up and down. A core drill body 4 having a pinion that meshes with the rack 2, a core bit 6 detachably attached to an output shaft 5 of the core drill body 4, a core bit 6 attached to the core drill body,
A motor 7 with a speed reducer for driving the core bit 6 to rotate,
A handle 9 for rotating the pinion is attached to a shaft portion 8 integral with the shaft of the pinion so as to be slidable in the radial direction, and is usually used when drilling a concrete structure or the like. Base 1 to concrete structure 1
0 with an anchor bolt or the like, and then operate the handle 9 to attach the core bit 6 to the concrete structure 10.
And then the motor 7 is driven to press the handle 9 to perform perforation. At the time of such perforation, if the concrete structure 10 or the like is, for example, a floor, there is a risk that the core in the core bit cut off from the surrounding concrete structure or the like will fall downstairs at the end of the perforation.

[0003] When a boring operation is performed on a fume tube or the like, there is a risk that the core may fall into the tube. If the core falls into the tube, the core cannot be recovered. 3-548
In No. 89, in order to prevent the core or core sample cut off at the end of drilling from falling downstairs, the lower end of a hanging rod supported vertically through the axis of the core bit is attached to a concrete structure or the like. A screw is fixed to the inserted metal insert by screwing, and the upper end is supported so as to be engageable with a support piece. Japanese Patent Publication No. 62-47642 discloses
A shaft to be planted at the center of the portion to be drilled, a sleeve rotatably mounted on the shaft, an arm having an upper end pivotally attached to the sleeve, and an annular body slidably fitted to the sleeve and the arm are connected. A support and a spring that acts to expand the arm, the tip of the arm is crimped to the core bit to connect the scheduled drilling portion and the core bit, and to prevent the core from dropping when cutting the core are disclosed. I have.

[0004]

According to the above-described apparatus,
At the end of drilling, the core or core sample that was cut off is prevented from falling, and the core or core sample can be pulled up by pulling up the hanging rod or extracting the core bit.
When using the former suspension rod, after inserting the insert metal into the center of the drilled part, it is necessary to adjust the position of the core drill body to align the suspension rod tip with the insert metal with the core bit raised. Is troublesome.

[0005] Similarly, in the latter case in which the hole is connected to the sleeve via the shaft, it is necessary to set the shaft at the center of the hole and then adjust the position of the core bit so that the center of the core bit coincides with the shaft. Yes, the work is troublesome. An object of the present invention is to provide a core drill that can easily perform a work for preventing a core or a core sample cut off from a surrounding concrete structure or the like at the end of drilling.

[0006]

The present invention provides a core drill comprising a support, a core drill body supported on the support so as to be able to move up and down, and a core bit detachably attached to an output shaft of the core drill body and driven to rotate by a motor. And a rope, a chain, preferably a wire, etc., which is connected to the core bit upper side, the output shaft or the core drill body so as to be adjustable in length, and supports the mounting means. It is characterized by.

According to the core drill of the present invention, at the time of drilling, it is sufficient that the core bit is applied to the drilled portion, and it is not necessary to adjust the position of the mounting means. The mounting means does not need to be mounted at the center of the perforated portion, and can be mounted at any position in the perforated portion. Moreover, the attachment means supported by the cable can be easily moved to any position.

At the time of piercing, the rope is twisted by the rotation of the core bit if one end is connected to the core bit or the output shaft and the other end is connected to the mounting means so that it cannot rotate. In order to solve this problem, one end of the cable may be connected to the core drill body that does not rotate, or a rotatable joint such as a swivel joint may be provided at an appropriate position on the cable so that the cable can be rotatably connected.

In the case of the core drill of the present invention, drilling progresses, and as the core drill penetrates deeply into a concrete structure or the like, there is a possibility that the cable is loosened and the core or the core sample falls off from the concrete structure or the like at the end of the drilling. Even if it falls off, it is supported by the cable and does not fall down as it is, but when it is pulled up, it is caught on the edge of the hole, making it difficult to pull up. In particular, when the mounting means is mounted at an eccentric position of the perforated portion, the core or the core sample is tilted, making it more difficult to pull up. In order to solve this problem, it is necessary to remove the slack by pulling up the cable.

The pulling of the rope is performed by grasping the rope and pulling it up, or winding the rope around a core bit, an output shaft, or a drum attached to a core drill body. In the former case, for example, it can be performed by crimping the rope with a cam provided at the lever base end by rotating the lever, and in the latter case, for example, the rope end of the rope wound on the drum, This can be done by inserting the flanges provided on both sides of the drum into holes formed at regular intervals in the circumferential direction. In the latter case, the slackened rope can be treated by winding it around the drum, but it is troublesome to wind the rope around the drum and wind it, and then wind the remaining cable end into the hole in the flange. I'm sorry. In order to solve this problem, the reel is rotatably mounted on the upper part of the core bit, the output shaft or the core drill body and can be fixed by the fixing means, or the rotation can be stopped by the rotation stopping means. The reel is preferably fixed to the reel so that the reel can be wound or unwound by rotating the reel in the opposite direction. The rope supports the reel bobbin or reel so that the reel can be smoothly wound or unwound. Axis,
It is desirable to be able to take up on a sleeve which is rotatably mounted on the cylindrical portion.

Accordingly, another aspect of the present invention is a core drill comprising a support column, a core drill body supported on the column so as to be able to move up and down, and a core bit detachably attached to an output shaft of the core drill body and driven to rotate by a motor. Attaching means to a perforated portion of a concrete structure, etc., a reel rotatably attached to the upper part of the core bit, the output shaft or the core drill body, a fixing means capable of fixing the reel or a rotation stopping means capable of stopping rotation, and one end attached. By means,
A rope connecting the other end to the reel, a chain, preferably comprising a rope such as a wire, in a preferred invention, the rope is a shaft for supporting the reel cylinder or the reel,
It is configured to be wound around a sleeve rotatably mounted on the cylindrical portion.

[0012] After the slack is eliminated by pulling up the above-described cable, even if the cable is loosened due to the progress of the drilling operation, the amount of the core and the core sample dropped at the end of the drilling is reduced. Even if it falls, it can be prevented from falling off the concrete structure etc., but pulling up the rope or winding it on a drum or reel to eliminate slack of the rope must be done once the drilling work is interrupted No. In order to solve this problem, it is preferable to attach one end of the cable to an arm supported in a cantilever manner on a column.

Therefore, still another invention is characterized in that one end of the cable is connected to an arm supported by a column.
According to the present invention, since the ropes connect the fixed objects, they do not loosen, and the core and the core sample are supported without falling down from the concrete structure or the like in a state of being cut off from the surrounding concrete structure or the like. . Further, since there is no twisting, it is not necessary to provide a rotatably connected joint such as a swivel joint.

Further, in the core drill for water cooling, the above-mentioned drum or reel is provided on the output shaft, the cable is taken out from the core bit through the inside of the output shaft, taken out from the opening on the peripheral surface of the output shaft, and wound on the drum or reel. In this case, if cooling water is supplied into the core bit through the output shaft for cooling the cutting portion and discharging chips, there is a problem that water overflows from the opening. In order to solve this problem, a guide having a water supply hole in the hollow output shaft is inserted and sealed so as to close the opening of the output shaft, and the cable is passed through the outside of the water supply hole of the guide, and then the output shaft is reconnected. It is good to draw out outside through an opening. This allows the cooling water supplied to the output shaft to be supplied into the core bit through the water supply hole of the guide,
It does not overflow from the opening of the output shaft.

Therefore, still another invention relates to a core drill in which the above-mentioned drum or reel is provided on an output shaft, a cable is taken out from an opening formed in a peripheral surface of the output shaft through a core bit through the output shaft, and wound around the drum or reel. , A water supply hole, and a guide that allows the cable to pass through a portion different from the water supply hole is fitted and sealed so as to close the opening in the output shaft, and the cooling water supplied to the output shaft is In addition to supplying water into the core drill through the water supply hole of the guide, the cable is passed through a guide other than the water supply hole, and is drawn out from the opening of the output shaft.

[0016]

FIG. 2 shows a core drill according to the present invention. An output shaft (not shown) of a core drill body 4 and a core bit 6 are connected by a connector 11. As shown in FIGS. 3 and 4, the connector 11 has an inner screw 12 screwed into the output shaft on the upper side, and an outer screw 13 screwed into the core bit 6 on the lower side. In addition, a drum 15 composed of a pair of flanges 14 is provided at the center, and an opening 17 communicating with a shaft hole 16 is provided in the body of the drum 15. Insert holes 19 for pins 18 are provided in the flange 15 at regular intervals in the circumferential direction. Has formed.

A swivel joint 25, which forms a mounting means together with an anchor 26, is connected to a lower end of a wire 21 which passes through the shaft hole 16 through the opening 17 and hangs down through the core bit 16. As shown in FIG. 5, the swivel joint 25 has a head-mounted rotor 22 at the wire end, a cap 23 for rotatably supporting the rotor 22 and a cap 23, and a reinforced concrete structure at the lower part. It comprises a main body 26 having a threaded portion 24 which is screwed into an anchor 26 driven into the object 10.

A grip 27 as shown in FIG. 4 is connected to the end of the wire extending outward from the opening 17 between the flanges through the shaft hole 16, and the grip 27 has an insertion hole 28 through which the pin 18 passes. ing. This device is configured as described above,
At the time of perforating the concrete structure 10, the anchor 26 is driven into place at the perforated portion and fixed.
First, the base 1 of the core drill is fixed to the concrete structure in accordance with the drilling location. Next, the core bit 6 is raised by operating the handle, and the core drill body 4 is fixed to the column 3 by screwing in the screw 30, and then the threaded portion 24 of the swivel joint 25 at the end of the hanging wire is anchored 2.
6 and screw connection. Next, grasp grip 27 and wire 2
1 is pulled out and the wire 2 connected to the anchor 26
1 is wound around the drum 15 in a stretched state, and the pin 18 is inserted into and connected to the insertion hole 19 of the flange 15 that matches the insertion hole 28 of the grip 27. The portion indicated by reference numeral 20 in FIG. 3 is a ring for easily pulling out the pin 18.

Thereafter, the core bit 6 is lowered by operating the handle, and the motor 7 is driven while being pressed against the concrete structure 10 to perform a drilling operation. During drilling, the drum 15 also rotates together with the core bit 6. If there is a risk that the grip 27 projects from the drum 15 and comes into contact with the body, a cover for covering the grip 27 may be provided. As the drilling progresses, the core bit 6 gradually penetrates into the concrete structure, and after a certain degree of progress, the motor 7
Is temporarily stopped, and in order to absorb the slack of the wire 21 caused by the lowering of the core bit 6, the pin 18 is pulled out, the grip 27 is gripped, and the wire 21 is wound around the drum 15 while being pulled out, and the slack of the wire 21 is absorbed. The grip 27 is again connected to the flange 15 with the pin 18. Thereafter, the motor 7 is driven again, and the drilling operation is restarted. When the drilling operation is completed and the core 10a at the drilled portion is cut off from the surrounding concrete structure 10, the slack of the wire 21 and the core 10a drop slightly due to their own weight, but do not fall off the concrete structure 10 without falling off. It is suspended in a state of being suspended. afterwards,
When the core bit 6 is pulled up by the handle operation, the core 1
0 a is also pulled up and comes out of the concrete structure 10.

In the above embodiment, the wire is connected to the drum 15 between the core bit 6 and the core drill body 4 through the shaft hole 16 of the connector 11, but in another embodiment, the wire is drawn out through the ceiling of the core bit 6. In the same manner as in the above embodiment, the drum is directly wound around and connected to the drum directly attached to the upper outside of the core bit 6, or is connected to the drum 15 described above.

In still another embodiment, the wire is connected to the drum provided on the core drill body 4 at its upper end through the shaft hole 16 of the connector 11 or through the ceiling of the core bit. In this case, since the core drill body 4 does not rotate, the swivel joint 25 as in the above embodiment is not required. The upper end of the wire is not wound around the drum, for example, a core bit, output shaft,
Alternatively, it may be wound around a bolt screwed into the core drill body and stopped. In this case, to adjust the length to eliminate the slack of the wire, the wire is once unwound and then re-wound.

In still another embodiment, the wire passes through the shaft hole 16 of the connector 11 and passes through the core drill body 4 to connect the upper end thereof to an arm supported in a cantilever manner at the upper end of the column. This embodiment does not require a rotatable joint such as a swivel joint because the wire does not slack when the core bit is lowered and the wire does not rotate.

FIG. 6 shows another embodiment of the connector. As in the case of the above-described connector 11, an inner screw 31 to be screwed into the output shaft is formed on the upper part and an outer screw 32 is formed on the lower part. And a slit-shaped opening 33 at an intermediate portion. A water supply guide 39 having a water supply hole 36 and a guide groove 38 through which a wire 37 passes is inserted from above into the shaft hole 35 in which the tip of the connector 34 is narrowed, and screwed into the water supply guide 39 through the opening 33. The rotation is stopped by a screw 41. Thereby, the cooling water supplied to the connector 34 passes through the water supply hole 36 of the water supply guide 39 and is supplied into the core bit. 42 is an o-ring for sealing.

A sleeve 44 is rotatably mounted in the middle part of the connector 34 so as to cover most of the opening 33, and a wire 37 drawn through the guide groove 38 of the water supply guide 39 and the opening 33 is wound. Reel 46 whose end is rotatably mounted on the middle of the connector 34
It is to be connected to. The reel 46 is rotatably mounted by being inserted into the connector 34 from the upper side, and has three concave portions 47 which are curved upward and outward so as to be easily gripped and rotated as shown in FIG. A recess 48 having a cross section of a keyhole is formed therein, and a metal fitting 49 having a key cross section connected to the tip of the wire is inserted and then a plug 50 is screwed into the recess and fixed. Has become. Then, a disk-shaped plate 54 which is fitted into the connector 34 from below and fastened to the flange portion 34a with a set screw 52 and has fitting holes 53 formed at regular intervals in the circumferential direction at the periphery as shown in FIG. Are fixed by lock pins 55 as fixing means. In the figure, reference numeral 58 denotes a washer attached to the reel 34 for preventing the reel 46 from being inserted into the connector 34, and reference numeral 51 denotes a snap ring.

Although a detailed structure of the lock pin 55 is omitted, a spring is built in. When the head 55a is pulled up against the action of the spring, the pin 56 at the tip is retracted, and the head 55a is retracted with the pin 56 retracted. When the pin 56 is rotated by 90 °, the pin 56 is kept in the retracted state, and when the head 55a is rotated by 90 ° reversely from the state in which the pin 56 is retracted, the pin 56 projects by the action of the spring. The pin 56 is attached to the recess 47 of the reel 46, and the pin 56 is
, The reel 46 is fixed or stopped from rotating. The fitting hole 53 has an oval shape as shown in FIG.
This allows the pin 56 to be fitted into the fitting hole 53 without hindrance even if it is mounted eccentrically, so that the mounting accuracy of the plate 54 is eased and some eccentricity can be tolerated.

According to the present apparatus, when the slack of the wire 37 is absorbed at the stage when the perforation has traveled to some extent, the head 55a of the lock pin 55 is pulled up and rotated by 90 °,
The pin 56 is retracted and detached from the fitting hole 53 of the plate 54 to maintain the detached state so that the reel 46 can be rotated. Next, the upper side of the reel is gripped and rotated, and the wire 37 is wound on the sleeve 44. When the wire is wound up to the winding limit and the slack of the wire 37 is absorbed, the lock pin 55
While the head 55a is rotated 90 ° in the reverse direction, the reel 46 is slightly rotated to fit the pin 56 into the fitting hole 53.

[0027]

According to the core drill of the first aspect, the mounting means may be mounted at an arbitrary position of the drilling point. In mounting, the rope is flexible, so that the mounting means is held at an appropriate position. In addition, since the core bit does not need to be considered in the position of the mounting means, the work at the time of drilling can be performed more easily than the conventional one. In addition, by temporarily suspending the work until the drilling operation is completed, pulling up the loose cable without pulling up the core bit and making it in a stretched state, the drop of the core or core sample cut off after the drilling is reduced. However, it is possible to prevent the concrete structure from falling off and to facilitate the lifting.

According to the core drill of the second aspect, the rope is not twisted and broken. According to the core drill of the third aspect, by using the wire as a wire, the core drill has strength and moderate flexibility, and can be easily wound around a drum for absorbing slack.

According to the core drill of the fourth aspect, since the rope is not twisted, it is not necessary to provide a rotatable joint. According to the core drill of the fifth aspect, the rope does not become slack with the progress of the drilling operation, and therefore, there is no need to interrupt the drilling operation to absorb the slack.
Also, there is no need to provide a rotatable joint on the cable.

According to the core drill of the sixth aspect, loosening of the cable can be performed by lifting the cable after releasing the lock by the fixing means, and can be fixed by the fixing means after the lifting. According to the core drill according to the seventh aspect, the fixing or release of the cable can be easily performed by rotating the lever.

According to the core drill of the eighth aspect, the slack of the rope can be easily absorbed or pulled out by rotating the reel, and the rope is attached to the sleeve as in the core drill of the ninth aspect. If winding is performed, winding and rewinding can be performed smoothly. According to the core drill of the tenth aspect, the water supplied through the shaft hole of the output shaft does not overflow from the opening for removing the cable.

[Brief description of the drawings]

FIG. 1 is a front view of a conventional core drill.

FIG. 2 is a front view of a core drill according to the present invention.

FIG. 3 is a partial sectional front view of the connector.

FIG. 4 is a sectional view of a drum part of the connector shown in FIG. 3;

FIG. 5 is a partial sectional front view of the swivel joint.

FIG. 6 is a cross-sectional view showing another example of the connector.

FIG. 7 is a sectional view taken along line AA of FIG. 6;

FIG. 8 is a plan view of the connector shown in FIG. 6;

[Explanation of symbols]

1. Base 2. Rack 3. Prop 4. Core drill body 5. Output shaft 6. Core bit 7. Motor with reduction gear 9. Handle 10. Concrete structure 11, 34. Connector 12. , 31 ... inner screw 13, 32 ... outer screw 14 ... flange 15 ... drum 16, 35 ... shaft hole 17, 33 ... opening 18 ... pin 19, 28 ... insertion hole 20 ... ring 21 , 37 ・ ・ Wire 22 ・ ・ Rotor 23 ・ ・ Main body 24 ・ ・ Screw part 25 ・ ・ Swivel joint 26 ・ ・ Anchor 27 ・ ・ Grip 36 ・ ・ Water supply hole 38 ・ ・ Guide groove 39 ・ ・ Water supply guide 41 ・ ・Screws 42 o-rings 44 sleeves 46 reels 47 recesses 49 recesses 50 plugs 51 snap rings 52 set screws 53 fitting holes 5 4. Plate 55 Lock pin 56 Pin 58 Washer

Claims (10)

[Claims] 1. A core drill comprising a support, a core drill body supported on the support so as to be able to move up and down, and a core bit detachably attached to an output shaft of the core drill body and driven to rotate by a motor. A core drill, comprising: means for attaching to a hole to be drilled; and a cable which is connected to the upper part of the core bit, the output shaft or the core drill body so as to be adjustable in length and supports the attaching means. 2. The core drill according to claim 1, wherein one end of the cable is connected to a core bit or an output shaft, and a rotatable joint is provided at an appropriate position. 3. The core drill according to claim 2, wherein the cable is a wire, and can be wound around a core bit, an output shaft, or a drum provided on the core drill body. 4. The core drill according to claim 1, wherein one end of the cable is connected to the core drill body. 5. The core drill according to claim 1, wherein one end of the cable is connected to an arm supported by a post instead of being connected to a core bit, an output shaft, or a core drill body. 6. The core drill according to claim 1, wherein the cable is fixed so as to be detachable by a fixing means. 7. The core drill according to claim 6, wherein the fixing means is a lever having a cam at a base end, and the cam is pressed against the rope by the rotation of the lever to fix the rope. 8. A core drill comprising a support, a core drill body supported on the support so as to be able to move up and down, and a core bit detachably attached to an output shaft of the core drill body and driven to rotate by a motor. Mounting means to the perforated portion, a reel rotatably mounted on the core bit upper side, the output shaft or the core drill body, fixing means capable of fixing the reel or rotation stopping means capable of stopping rotation, one end to the mounting means, the other end A core drill, comprising a cable connecting the reel to a reel. 9. The core drill according to claim 8, wherein the rope is wound around a reel which is rotatably mounted on a cylindrical body or a shaft which supports the reel. 10. A water supply shaft hole is formed in the output shaft, a guide provided with a water supply hole is inserted and sealed in the shaft hole, and a cable threaded from the core bit to the output shaft is supplied with water. The core drill according to any one of claims 1 to 4, or 6 to 10, wherein the core drill is formed on an output shaft after being passed through a guide outside the hole and taken out from an opening closed by the guide.