JP4440388B2 - Core drilling device that can drill multiple holes at the same time - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a core drill apparatus capable of simultaneously drilling a plurality of holes in appropriate locations such as a floor, a wall surface, and a ceiling in a concrete building.
[0002]
[Prior art]
As an example of seismic reinforcement work for concrete buildings, a number of holes are made in the floor, wall, ceiling, etc., and reinforcing bars are fixed to the holes using adhesive anchors that are post-installed anchors, and braces are made using these reinforcing bars. Work is being done to reinforce a building by building a structure or welding other reinforcing bars that are cores to the fixed reinforcing bars to add walls. The drilling work by the conventional method has a problem that only one hole can be drilled at one time, so that the work efficiency is poor, and a hammer drill is mainly used for the drilling apparatus. However, since the hammer drill uses a so-called hammer action that applies a blow using compressed air simultaneously with rotation, it is accompanied by noise and vibration that cause pollution.
[0003]
On the other hand, the seismic reinforcement work for concrete buildings is difficult to use while using the building because it has a problem of deteriorating the living environment. Consideration such as construction on holidays when there are relatively few in and out.
[0004]
[Problems to be solved by the invention]
The problem to be solved by the present invention is to provide a core drill device capable of simultaneously drilling a plurality of holes in a concrete building and suppressing the occurrence of pollution such as noise, vibration and dust, and other problems. The object is to provide a core drill device in which holes can be drilled in a parallel or staggered manner and can be easily disassembled and assembled.
[0005]
[Means for Solving the Problems]
The present invention relates to a base board, a support column detachably provided on the base board, a lifting platform slidably provided on the support column, a pair of drill holding cylinders provided on the lifting platform, and the drill holding It consists of a core drill that can be rotated on the cylinder, and a rotation drive mechanism for rotating the core drill, and each of the drill holding cylinders can rotate an arm provided on each drill holding cylinder to the lifting platform It is possible to change the interval between the holes to be drilled by attaching to the shaft, and the rotational drive mechanism can be changed in the mounting position corresponding to the interval between the holes drilled by the core drill provided on the lifting platform. A feature is that a plurality of holes can be drilled simultaneously.
[0006]
In the above apparatus, the core drill is provided with a water supply mechanism for supplying water into the core drill at an upper position, and the core drill has a dust collecting cylinder having a lower end opened at a lower position. The core drill is provided so that it can freely rotate.
[0007]
In the above apparatus, the base board is provided with a pinion that can be manually rotated inside, the pinion meshes with a rack provided on a rail, and is movable along the rail by the rotation of the pinion. To do.
[0008]
In the above apparatus, the support column is composed of a pair of tubular bodies, the screw shaft is inserted in a free state therein, and is fitted into a pair of connecting rods provided on the top of the base board, and the screw shaft is It is characterized in that it is screwed to the female thread of the connecting rod.
Further, the support column is formed in a tapered portion whose inner peripheral surface at the lower end has a large diameter toward the opening, and the outer peripheral surface of the connecting rod provided on the base board is formed in a tapered shaft corresponding to the tapered portion of the support column. It is characterized by.
[0009]
In the above apparatus, the lifting platform is slidably provided on the support and can be slid along the support by manual rotation of a ball screw shaft provided in a direction parallel to the support.
[0010]
In the above apparatus, the core drill is detachably attachable to a base drill that penetrates vertically in the drill holding cylinder and is rotatable, and a tip drill having a bit made of diamond or a carbide tip. The rotational force of a rotational drive mechanism is transmitted to the said base end drill, It is characterized by the above-mentioned.
The core drill is characterized in that an intermediate drill is detachably provided between the proximal drill and the distal drill.
Furthermore, the core drill is characterized in that the inner diameter of the intermediate drill is larger than the inner diameter of the tip drill, and the inner diameter of the proximal drill is larger than the inner diameter of the intermediate drill.
[0011]
In the above apparatus, the rotational drive mechanism has a motor detachably provided on the lifting platform and a drive sprocket provided on the output shaft of the motor, and the main sprocket provided on the proximal drill of the core drill and the drive A timing belt is mounted between the sprocket and the sprocket.
The rotation drive mechanism is detachably connected to one of the two mounting legs provided on the lifting platform so as to be extendable, and is pivotally attached to the other mounting leg. It is characterized by that.
Further, the first mounting leg among the mounting legs of the lifting platform is a length in which the relay plate is slidably fitted to the housing, and the housing and the relay plate are formed along the length of the housing. It is characterized in that it is attached in a telescopic manner through a hole, a connecting plate is attached to the tip of the relay plate, and the connecting plate is connected to a motor mounting board.
[0012]
In the above apparatus, the water supply mechanism includes a cylindrical water tap and a lid, and the water tap is provided so as to be rotatable with respect to the lid, and the outer peripheral surface of the lower end is a tapered surface having a small diameter toward the tip. A water supply port for connecting a hose to the upper part of the lid body, and a rotation stop structure for the lid body, and a taper surface of the water tap formed at the base end of the core drill. It is characterized in that it is fitted to a surface to couple them together.
Further, the water supply mechanism is characterized in that the lid and the water faucet rotate separately by fixing a rotation stop plate provided on the lid in a groove formed in the drill holding cylinder.
[0013]
In addition, in this apparatus, the dust collection cylinder provided near the tip of the core / drill is provided with an outlet for collecting water supplied from the water supply mechanism and dust generated by the drilling operation. It is said.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIGS. 1 to 3, the core drill device of the present invention includes a base board 1, two support columns 2 provided on the base board 1, an elevator 3 provided on the support 2, and an elevator 3 A pair of provided drill holding cylinders 4, a core drill 5 provided in the drill holding cylinder 4, a rotation drive mechanism 6 for rotating the core drill 5, and water supply for supplying water to the core drill 5 It consists of a mechanism 7, and two holes can be drilled in the concrete surface 8 at the same time so that they can be drilled in parallel or in a staggered manner and can be easily disassembled and assembled.
[0015]
4 and 5, the base board 1 is movable along a rail 101 laid on a concrete structure, and the rail 101 is supported by a press plate 102 fixed to the building by an anchor bolt (not shown). A rack 103 is formed on the surface of the rail 101 and meshes with a pinion 104 provided on the base board 1. The rotation shaft 105 of the pinion 104 protrudes from the base board 1, and a universal joint 106 is provided on the rotation shaft 105. When the universal joint 106 is rotated by a handle (not shown), the base board 1 moves on the rail 101. Further, the rail 101 is provided with a groove 107 along its length on the wall surface, and a pair of fixing plugs 108 are in contact with the groove 107. The shaft 109 of each fixing plug 108 protrudes from the base board 1, and when the knob 110 provided on the shaft 109 is rotated, the shaft 109 advances and retreats, and the fixing plug 108 is attached to and detached from the groove 107.
[0016]
In addition, a pair of connecting rods 111 that are coupled to the column 2 are provided on the top of the base board 1. Each connecting rod 111 is provided with a female screw 112 at the shaft end portion, and is formed on a tapered shaft whose outer peripheral surface has a small diameter toward the shaft end. In the figure, reference numeral 113 denotes a stabilizing device for stabilizing the base board 1.
[0017]
In FIG. 1 and FIG. 4, the support columns 2 are tubular bodies, and a pair of them are provided in parallel. The upper end portion is fixed to the upper fixing plate 201, and the lower end portion is fixed to the lower fixing plate 202 to keep parallel. The lift 3 is slidably provided in the middle part. In particular, referring to FIG. 4B, the column 2 has a screw shaft 203 inserted therein, and the screw shaft 203 protrudes from the upper end of the column 2 and is intended to prevent the screw shaft 203 from loosening at the protruding portion. The nuts 204 and 205 are screwed as double nuts. Further, the lower end of the support column 2 is formed with a taper portion 206 having an inner peripheral surface that is larger in diameter toward the opening. The inclination angle of the taper portion 206 is the same as the inclination angle of the taper shaft formed on the connecting rod 111. Matched.
[0018]
When the lower end portion of the support column 2 is fitted into the connecting rod 111 of the base board 1, the screw shaft 203 is free in the longitudinal direction with respect to the support column 2, so that the screw shaft 203 comes into contact with the top portion of the connecting rod 111. The column 2 protrudes from the upper end of the column 2 as much as the column 2 is lowered. Therefore, the nuts 204 and 205 are moved upward by a length that allows the screw shaft 203 to be lowered, and then the screw shaft 203 is rotated and screwed into the female screw 112 of the connecting rod 111 to couple them together. Thereafter, when the nuts 204 and 205 are tightened, the screw shaft 203 is fixed to the connecting rod 111, and thereby the column 2 is installed on the base board 1.
[0019]
FIG. 6 shows a modification of the column mounting structure, which is a convenient mounting structure for separating the column 2 and the connecting rod 111. A female screw 210 is provided on the lower fixing plate 202 that fixes the column 2, and a hexagonal bolt 211 is screwed into the female screw 210. The position of the female screw 210 is close to the connecting rod 111, and the hexagonal bolt 211 has a lower end that abuts against the base board 1. At this time, the hexagonal portion needs to have a length that does not abut against the lower fixing plate 202. When the support column 2 is fitted to the connecting rod 111 and both are fixed, the hexagon bolt 211 has its lower end in contact with the base board 1. When the column 2 is separated from the base board 1, both can be separated by removing the screw shaft 203 from the connecting rod 111. However, when it is difficult to separate the column 2 and the connecting rod 111, the hexagon bolt 211 is rotated in the tightening direction. Then, the tip of the hexagonal bolt 211 presses the base board 1 to lift the lower fixing plate 202 from the base board 1, so that they are easily separated.
[0020]
In FIG. 1 and FIG. 2, the lifting platform 3 is slidably provided on the column 2, and between the lifting platform 3 and the upper fixing plate 201 provided at the upper end of the column 2, They are connected by a ball screw shaft 301 inserted in a parallel direction. The ball screw shaft 301 is screw-coupled so that the coupling with the lifting platform 3 functions as a ball screw mechanism, and the ball screw shaft 301 is coupled with the upper fixing plate 201 in a free state. A handle 302 is provided at the upper end portion.
[0021]
In FIG. 1 to FIG. 3, a pair of drill holding cylinders 4 are provided, and an arm 401 projecting from the side of the holding cylinder is rotatably connected to a lifting / lowering table 3 by a main shaft 402. 3, the mounting angle of the arm 401 can be fixed by fastening the arm 401 to the lifting platform 3. In particular, referring to FIG. 3, the arm 401 can be rotated to the left and right to select the mounting interval of each drill holding cylinder 4, and the line connecting the centers of the drill holding cylinders 4 is the moving direction of the apparatus. That is, when the rails 101 are oriented in parallel along the longitudinal direction of the rail 101, the holes that are continuously drilled are parallel, and when the line connecting the centers is inclined with respect to the moving direction of the device, the holes are opened Becomes a staggered pattern.
[0022]
In FIG. 7, the drill holding cylinder 4 is hollow, and a core drill 5 is rotatably provided inside and protrudes in the vertical direction of the drill holding cylinder 4. The core drill 5 is divided into a base end drill 501, an intermediate drill 502, and a front end drill 503. Of these, the base end drill 501 is mainly engaged with a timing belt at a portion protruding from above the drill holding cylinder 4. A sprocket 504 is provided via a key or the like, and the main sprocket 504 is fixed to the proximal drill 501 by a nut 505. The proximal drill 501, the intermediate drill 502, and the distal drill 503 are all screw-coupled, and the inner diameter is gradually increased from the distal drill 503 to the proximal drill 501. In addition, a fastening portion 506 having a two-sided width is formed at a joint portion between the intermediate drill 502 and the tip drill 503.
[0023]
The tip drill 503 is provided with a plurality of diamond or cemented carbide bits 507 on the peripheral edge of the tip (lower end). The tip drill 503 is provided with a dust collection cylinder 520 having a lower end opened near the tip so that the core drill can freely rotate. As will be described later, since water is injected into the core drill 5 from the upper end of the drill in order to facilitate the drilling operation, an outlet 521 for collecting the water and dust generated by the drilling operation is provided as a dust collecting cylinder. 520. In the figure, reference numeral 522 denotes a hose connected to the outlet 521.
[0024]
3 and 8 to 10, the rotary drive mechanism 6 has a motor 601 provided on the elevator 3 and a drive sprocket 602 corresponding to a timing belt provided on the output shaft of the motor 601. A timing belt 603 is attached to the main sprocket 504 of the proximal drill 501 described above. Since the core drill 5 is composed of a pair, the timing belt 603 is attached to the drive sprocket 602 and the two main sprockets 504. The timing belt 603 is attached to the support column 2 to prevent the belt from loosening. The pulley 604 provided is joined.
[0025]
The mounting position of the motor 601 can quickly respond to the mounting / dismounting of the lifting / lowering table 3 and the change in the interval between holes to be drilled. In particular, referring to FIG. 8, the lifting platform 3 is provided with two mounting legs 303, 304 facing each other on the side opposite to the protruding direction of the arm (401). The first mounting leg 303 is telescopic and is provided at the corner of the elevator 3 by a hinge shaft 305 so as to be rotatable. The first mounting leg 303 is parallel to the second mounting leg 304. When facing toward, the planar shape becomes U-shaped.
[0026]
The first mounting leg 303 is configured such that the relay plate 307 is slidably fitted to a housing 306 having a U-shaped cross section, and the housing 306 and the relay plate 307 are formed in the housing 306 along the longitudinal direction. Both are connected to each other by a stop shaft 309 through a hole 308 so as to be expandable and contractible. Further, a connecting plate 310 is provided at the tip of the relay plate 307 by a pin 311 so as to be rotatable. In the figure, 312 is a bolt provided on the connecting plate 310, and 313 is a pivot provided at the tip of the second mounting leg 304.
[0027]
On the other hand, the motor 601 is provided with a mounting substrate 605 at the body portion, and a shaft hole 606 is formed at a corner of the mounting substrate 605 (FIG. 9). The shaft hole 606 is connected to the pivot 313 of the second mounting leg 304. A fan-shaped body 607 that is coaxial with the shaft hole 606 is provided in the shaft hole 606 portion, and the arc-shaped portion 608 of the fan-shaped body 607 is in contact with the arc-shaped surface 314 formed on the second mounting leg 304. Then, the shaft hole 606 is fitted to the pivot 313.
[0028]
In FIG. 7, the water supply mechanism 7 is provided at the upper end portion of the base end drill 501 constituting the upper portion of the core drill 5. The proximal drill 501 is formed on a tapered surface 510 in which the inner peripheral surface of the upper end portion becomes larger in diameter toward the opening. The water supply mechanism 7 includes a cylindrical water tap 701 and a lid body 702. The water tap 701 can be rotated with respect to the lid body 702 via a bearing and protrudes from the lid body 702. The peripheral surface is formed on a tapered surface 703 that coincides with the tapered surface 510 formed in the opening of the proximal drill 501, and when the water tap 701 is fitted to the upper end of the proximal drill 501, the tapered surfaces are in close contact with each other. Rotate together.
[0029]
Further, a water supply port 704 is provided at the center of the upper surface of the lid 702, and water supplied from a hose 705 connected to the supply port 704 is injected from the water tap 701 into the core drill 5. . In order to prevent the lid 702 having the hose 705 from rotating when the water tap 701 is fitted to the upper end of the proximal drill 501, the lid 702 is provided with a rotation stop plate 706 downward, A groove 403 into which the rotation stop plate 706 is fitted is formed in the drill holding cylinder 4. When the stop plate 706 is fitted into the groove 403, the lid 702 is prevented from rotating, and only the water tap 701 rotates together with the proximal drill 501. The rotation stop plate 706 is fitted into the groove 403 and is fixed to the drill holding cylinder 4 with a wing screw 707.
[0030]
This apparatus can be disassembled into three components: a base board 1, a lifting platform 3 slidable with respect to a column 2, and a rotational drive mechanism 6 of a core drill 5.
[0031]
At the start of the drilling operation, the base board 1 is placed on the rail 101 laid on the concrete surface 8, the shaft 109 is rotated by the knob 110, the fixing plug 108 is pressed against the groove 107 of the rail 101, and the base board 1 is mounted. Fix to the rail 101. Next, the support column 2 is fitted to the connecting rod 111 protruding from the top of the base board 1. Since the screw shaft 203 in the support column 2 is only inserted into the support column 2, the screw shaft 203 protrudes from the upper fixing plate 201 when the support column 2 is fitted into the connecting rod 111. Therefore, after the nuts 204 and 205 are moved upward by a length that allows the screw shaft 203 to descend, the screw shaft 203 is rotated and screwed into the connecting rod 111. When it is confirmed that the connection between the connecting rod 111 and the screw shaft 203 is sufficient, the nuts 204 and 205 are tightened, whereby the base board 1 and the column 2 are connected.
[0032]
Next, the rotary drive mechanism 6 is mounted on the lifting platform 3. The rotary drive mechanism 6 is fitted with the shaft hole 606 to the pivot 313 of the second mounting leg 304, and the set screw in a state where the arc portion 608 of the sector 607 is in contact with the arcuate surface 314 of the second mounting leg 304. Temporarily fix 609. The first mounting leg 303 loosens all of the hinge shaft 305, the stop shaft 309, and the pin 311, and fixes the connecting plate 310 to the mounting substrate 605 of the motor 601 with bolts 312. However, all the shafts are left temporarily fixed. When assembled as described above, if the tip drill 503 is detached from the intermediate drill 502, the tip drill 503 is connected to the lower end portion of the intermediate drill 502 after the elevator 3 is pulled up by operating the handle 302.
[0033]
Here, the interval between holes drilled in the concrete surface 8 is determined. The interval between the core drills 5 can be set by loosening the main shaft 402 of the arm 401, adjusting the leg angle of the arm 401, and then tightening and fixing the main shaft 402. A timing belt 603 is hung between the main sprocket 504 of the core drill 5 and the drive sprocket 602 of the motor 601. When the motor 601 is incorporated in the elevator 3, all the axes are in a temporarily fixed state, so the motor 601 rotates counterclockwise around the pivot 313 in plan view. When the motor 601 moves upward in FIG. 3, the timing belt 603 is in a transmittable state. Here, the set screw 609, the hinge shaft 305, the stop shaft 309, and the pin 311 are all tightened.
[0034]
Before the drilling operation, the dust collecting cylinder 520 is fitted to the tip of the tip drill 503. The elevator 3 is moved up and down by the rotation of the ball screw shaft 301, and the handle 302 is lowered by operating the handle 302 to join the core drill 5 to the concrete surface 8. A hole is made in the concrete surface 8 by a tip drill 503 by driving a motor 601 while injecting necessary water into the core drill 5 from the water supply mechanism 7. Since the tip drill 503 descending together with the elevator 3 is lowered by manual operation of the handle 302, the ball screw shaft 301 is rotated to a required depth.
[0035]
In an embodiment, the diameter of the hole in the device is approximately 16-30 mm. Incidentally, when a hole having a diameter of 30 mm and a depth of 250 mm is drilled, the D22 rebar is embedded using an adhesive anchor.
[0036]
When the drilling operation is finished at the initial position, the core drill 5 is pulled up by operating the handle 302. To move to the next drilling position, the knob 110 is loosened to release the fixing of the rail 101 and the fixing plug 108, and then the universal joint 106 is rotated via a handle (not shown). By rotating the rotating shaft 105, the pinion 104 is rotated while meshing with the rack 103 of the rail 101 to move the base board 1. When the base board 1 reaches a predetermined position, the knob 110 is tightened to fix the rail 101 and the fixing plug 108 again, and the next drilling operation is performed. When the drilling operation is continuously performed, the core drill 5 is clogged with scraps. When the hole is clogged to some extent, the core drill 5 is discharged. Since the tip drill 503 is screwed to the intermediate drill 502, the tip drill 503 is removed from the intermediate drill 502 and the clogging clogged inside is discharged.
[0037]
The distance between holes that can be drilled is maximum when the arm 401 is extended to a position where the core drill 5 provided in the drill holding cylinder 4 does not contact the rail 101 in FIG. 3, and the position indicated by a two-dot chain line is the minimum. . Therefore, the interval between the holes can be freely selected. If the center portions of the drill holding cylinders 4 provided in pairs are both parallel to the rail 101, the holes are formed in parallel, and if they are set obliquely, the holes are formed in a staggered pattern. If the interval of the core drill 5 is changed by adjusting the leg angle of the arm 401, the tension of the timing belt 603 changes. Therefore, when the interval of the core drill 5 is changed, it is necessary to change the installation position of the motor 601. .
[0038]
By the way, when the bit 507 of the core drill 5 hits the reinforcing bar when the hole is made in the concrete, the reinforcing bar cannot be cut in order to maintain the structural strength of the concrete building. In this case, the core drill 5 hitting the reinforcing bar is moved to the vicinity of the position. That is, drilling is performed after the arm 401 of the drill holding cylinder 4 is rotated to move the drill holding cylinder 4 (core drill 5) to a position where the rebar does not hit.
[0039]
In the water supply mechanism 7, since the outer peripheral surface of the cylindrical water tap 701 and the inner peripheral surface of the upper end portion of the proximal drill 501 are both formed on the tapered surfaces 703, 510, both of them are fitted to the proximal drill 501. Are in close contact with each other. Further, since water is supplied from the upper end of the water tap 701, the water necessary for the core drill 5 for drilling can be reliably supplied to the bit 507. As described above, since the water tap 701 is only fitted to the proximal drill 501, not only the handling is easy, but also the maintenance or the measure against the failure is facilitated.
[0040]
The water injected from the water tap 701 is collected from the dust collecting cylinder 520 together with dust generated during the drilling operation, but the collected water can be circulated and reused through a filtration device (not shown).
[0041]
In the embodiments, the case where the present apparatus is installed on a concrete floor surface has been described. However, the present apparatus is not limited to a floor surface, and can be installed on a side wall or a ceiling portion to perforate the side wall and the ceiling. In addition, water is supplied to the core drill when drilling in the ceiling portion. However, since the water supply mechanism is fixed to the drill holding cylinder, the work can be performed even when directed upward from the core drill.
[0042]
【The invention's effect】
The present invention can continuously make a plurality of holes in every part of the side wall or ceiling including the floor surface of a concrete structure, and minimizes the occurrence of pollution such as noise, vibration and dust. In addition, since the device of the present invention can be divided into three components, that is, a base board, a lifting platform, and a rotary drive mechanism, it can be assembled and used on site, so that the burden on workers can be reduced. Drilling work on the side walls and the ceiling is facilitated.
[Brief description of the drawings]
FIG. 1 is an overall front view.
FIG. 2 is an overall side view.
FIG. 3 is an overall plan view.
4A is a front view of a base board, and B is a front view of a column. FIG.
FIG. 5 is a side view of a partial longitudinal section of the base board.
FIG. 6 is a front view showing a modification of the support mounting structure.
7A is a side view of a longitudinal section of a core drill, and FIG. 7B is a sectional view of a water supply mechanism.
FIG. 8A is a plan view showing a part of a lifting platform, and B is a plan view of a motor.
FIG. 9A is a side view showing a mounting leg, and B is a cross-sectional view taken along line bb.
FIG. 10 is a cross-sectional view showing a distal end portion of a second mounting leg.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Base board 2 Support | pillar 3 Lifting stand 4 Drill holding cylinder 5 Core drill 6 Rotation drive mechanism 7 Water supply mechanism 8 Concrete surface 101 Rail 102 Presser plate 103 Rack 104 Pinion 105 Rotating shaft 106 Universal joint 107 Groove 108 Fixing plug 109 Shaft 110 Knob 111 Connecting rod 112 Female screw 113 Stabilizer 201 Upper fixing plate 202 Lower fixing plate 203 Screw shaft 204 Nut 205 Nut 206 Tapered portion 210 Female screw 211 Hexagon bolt 301 Ball screw shaft 302 Handle 303 First mounting leg 304 Second mounting leg 305 Hinge shaft 306 Housing 307 Long hole 309 Stop shaft 310 Connection plate 311 Pin 312 Bolt 313 Axis 314 Arc surface 401 Arm 402 Main shaft 403 Groove 501 Base drill 502 Intermediate drill 503 Tip drill 504 Sprocket 505 Nut 506 Tightening portion 507 Bit 510 Tapered surface 520 Dust collection cylinder 521 Extraction port 522 Hose 601 Motor 602 Drive sprocket 603 Timing belt 604 Pulley 605 Mounting substrate 606 Shaft hole 607 Arc portion 609 Set screw 701 Water supply tap 702 Lid 703 Tapered surface 704 Supply port 705 Hose 706 Stop plate 707 Wing screw

Claims (16)

A base board (1), a column (2) detachably provided on the base board (1), an elevator (3) provided slidably on the column (2), and the elevator (3) A pair of drill holding cylinders (4) provided on the core, a core drill (5) rotatably provided on the drill holding cylinder (4), and a rotation drive mechanism for rotating the core drill (5) ( 6), and the drill holding cylinder (4) is configured such that an arm (401) provided on each drill holding cylinder (4) is pivotally mounted on the lifting platform (3) so that a hole is drilled. The rotational drive mechanism (6) can be changed in accordance with the interval between the holes provided in the elevator (3) and drilled by the core drill (5). A core drilling device capable of drilling a plurality of holes at the same time. The core drill (5) is provided with a water supply mechanism (7) for supplying water into the core drill (5) at an upper position at the same time. Core drilling device that can drill. The core drill (5) is provided with a dust collecting cylinder (520) having a lower end opened at a lower position so that the core drill can freely rotate. Core drilling device that can drill multiple holes. The base board (1) meshes with a rack (103) formed on a rail (101) laid on a concrete structure with a pinion (104) provided in the interior, and the pinion (104) rotates to the rail (101). 4. A core drilling device capable of simultaneously drilling a plurality of holes according to claim 1, wherein the core drilling device is capable of being drilled simultaneously. The strut (2) is composed of a pair of tubes, and a screw shaft (203) is inserted in a free state therein, and is fitted to a pair of connecting rods (111) provided on the top of the base board (1). And simultaneously screwing the screw shaft (203) into the female thread (112) of the connecting rod (111). Core drilling device that can. The strut (2) is formed in a tapered portion (206) whose inner peripheral surface at the lower end has a large diameter toward the opening, and the outer peripheral surface of the connecting rod (111) provided in the base board (1) is the strut ( 6. A core drilling device capable of simultaneously drilling a plurality of holes according to claim 5, wherein the core drilling device is formed on a tapered shaft corresponding to the tapered portion of 2). The lifting platform (3) is slidably provided on the support (2), and along the support (2) by manual rotation of a ball screw shaft (301) provided in a direction parallel to the support (2). 4. A core drilling device capable of simultaneously drilling a plurality of holes according to claim 1, wherein the core drilling device is capable of sliding. The core drill (5) includes a base end drill (501) which is vertically provided in the drill holding cylinder (4) and is rotatably provided, and a bit made of diamond or a carbide tip on the base end drill (501). The tip drill (503) having (507) is detachably provided, and the rotational force of the rotational drive mechanism (6) is transmitted to the proximal drill (501). A core drill device capable of drilling a plurality of holes simultaneously according to any one of the above. 9. The core drill (5) according to claim 8, wherein an intermediate drill (502) is detachably provided between the proximal drill (501) and the distal drill (503). Core drilling device that can drill multiple holes. In the core drill (5), the inner diameter of the intermediate drill (502) is larger than the inner diameter of the tip drill (503), and the inner diameter of the proximal drill (501) is larger than the inner diameter of the intermediate drill (502). The core drill apparatus according to claim 9, wherein a plurality of holes can be drilled simultaneously. The rotary drive mechanism (6) has a motor (601) detachably provided on the lifting platform (3) and a drive sprocket (602) provided on the output shaft of the motor (601). The timing belt (603) is mounted between the main sprocket (504) provided on the proximal drill (501) of 5) and the drive sprocket (602). A core drill device capable of drilling a plurality of holes simultaneously according to any one of the above. The rotation drive mechanism (6) is detachably connected to one of the two mounting legs (303, 304) provided on the lifting platform (3) so as to be extendable and attachable to the other. 12. The core drilling device capable of simultaneously drilling a plurality of holes according to claim 11, wherein the core drilling device is pivotally attached to a leg (304). Of the mounting legs of the lifting platform (3), the first mounting leg (303) slidably fits the relay plate (307) to the housing (306), and the housing (306) and the relay plate described above. (307) is axially attached to the housing (306) through a long hole (308) formed along the length thereof, and the connecting plate (310) is axially attached to the tip of the relay plate (307). The core drilling device according to claim 12, wherein the connecting plate (310) is coupled to a motor mounting substrate (605). The water supply mechanism (7) includes a cylindrical water tap (701) and a lid (702). The water tap (701) is provided rotatably with respect to the lid (702) and has an outer periphery at the lower end. A tapered surface (704) having a small diameter toward the tip is formed, and a water supply port (705) for connecting a hose is provided at the top of the lid (702), and the lid (702) is prevented from rotating. The structure according to claim 2, wherein a structure is provided, and the tapered surface of the water tap (701) is fitted to a tapered surface formed at the proximal end of the core drill (5) to couple them together. Core drilling device that can drill multiple holes at the same time. The water supply mechanism (7) includes a lid (702) and a water faucet (fixed) by fixing a rotation stop plate (707) provided on the lid (702) in a groove (403) formed in the drill holding cylinder (4). The core drilling device capable of simultaneously drilling a plurality of holes according to claim 14, wherein 701) rotates separately. The dust collecting cylinder (520) provided in the vicinity of the tip of the core drill (5) is provided with an outlet (521) for collecting water supplied from the water supply mechanism (7) and dust generated by the drilling operation. The core drill apparatus according to claim 3, wherein a plurality of holes can be drilled simultaneously.

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