JPH1058435A - Rotating drill device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to drill a hole in a wall face and the like by simple working by supplying cooling agent, which is formed by mixing organic solvent having a low boiling point with liquid as a base material, from an aerozol can. SOLUTION: The following parts are provided. A cover member 21 has a drill bit 15 piercing therethrough and a dust exhausting port 21f, which is inclined from the side of an opening part to the side of a bottom surface side with respect to the orthogonal axis of the axial line of the drill bit 15, provided at the outer peripheral surface part. An attachment member 23 is coupled with an opening part 21d of the cover member 21. The cover member 21 is attached to a bracket member 22. A dust container 26 stores gel-state dust 102 generated from a hole part 101. The dust container 26 is attached in parallel with the dust exhaust port 21f in the slant state. The attachment member 23 has an inner surface attachment part 23d having the slight rigidity and an outer surface attachment part 23e having flexibility.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary drilling apparatus suitable for drilling a repair hole drilled when repairing a wall or ceiling of a building, and more particularly to a rotary drilling apparatus using a liquid as a base material. The present invention aims to improve the usability of a rotary drilling apparatus that pierces a wall surface or the like by jetting and supplying a coolant enclosed in an aerosol can in a liquefied state by mixing an organic solvent having a low boiling point from the tip of a drill pit.

[0002]

2. Description of the Related Art For example, in concrete buildings, cracks and tiles peeling off on walls and ceilings, etc.
Alternatively, when performing repair such as lifting of the exterior wall, holes for repair are drilled at these locations, and the repair holes are filled with an adhesive or hammered with anchor pins. Moreover, in a concrete building, in order to maintain a good condition of a wall surface, a ceiling, and the like for a longer period of time, waterproof treatment thereof is indispensable. In particular, cracks generated on the wall surface or the like allow rainwater or the like to enter the interior and erosion the concrete. In addition, the rainwater or the like repeatedly freezes and melts in the winter to expand cracks, and in the worst case, corrodes and destroys even the internal steel frame and the reinforcing steel.

[0003] The above-mentioned repair hole is generally drilled at a predetermined location such as a wall surface by using a rotary drill device such as a vibration drill device or a rotary drill device. The vibration drill device has a feature that a repair hole can be easily drilled by eliminating the need for cooling water or the like. However, this vibrating drill device generates a large amount of noise due to vibration of the drill at the time of drilling work, and has a problem when used in, for example, repair work in an apartment, hotel, hospital, or the like. In addition, when the vibration drill device is used in a state where the drilling position and the hole diameter are wrong, the problem that the crack to be repaired is insignificantly expanded is caused.

[0004] For this reason, recently, a rotary drill device equipped with a diamond pit is generally used for the above-mentioned repair work. In this rotary drill device,
In order to improve work efficiency or reduce noise, for example, cooling water is supplied from the tip of the drill pit to the drilled portion. The cooling water is sprayed out of the drill pit using compressed air in order to efficiently cool the drill pit and remove dust generated from the drilled holes.

For example, Japanese Unexamined Patent Application Publication No. Sho 60-262608, "Impactless drilling method", discloses that a low-temperature liquefaction of air, water, carbon dioxide gas or the like is performed from a cutting edge (drill pit) of a drill having a feed path penetrating to the tip. 2. Description of the Related Art There is disclosed a rotary drill device in which a fluid such as gas is injected and supplied into a borehole to efficiently cool a drill and discharge dust generated. The rotary drill device disclosed in the prior application is provided with a drill guide means for defining a drilling position and a dustproof structure for preventing generated dust from scattering.

[0006] Japanese Patent Application Laid-Open No. Hei 1-206005, "Punching Method for Concrete Buildings" also discloses that chips are efficiently discharged by ejecting compressed air forming a reverse flow in the drilling from the tip of the drill pit. A rotary drill device as described above is disclosed. This rotary drilling device has the feature that by using no cooling water, the supplied cooling water mixes with the chips to contaminate the periphery of the perforated portion or to be used in places without water supply facilities. ing.

[0007]

The conventional rotary drilling apparatus generally requires a supply source for supplying cooling water and compressed air to the drill pit. Therefore, in the drilling work, in addition to the rotary drill device, various facilities such as a compressor for supplying compressed air, a water tank storing cooling water, or a hose connecting the compressor and the water tank to the rotary drill device are required. Was needed. These facilities have a total weight of about 4
There was a problem that the handling was as inconvenient as 0 kg.

The drilling operation requires a setup operation in which a compressor and a water tank are installed in the most efficient place, and then a hose is pulled from the compressor and the water tank to a rotary drill device. The work area was restricted by the compressor and the water tank, which were large in weight and external shape, which sometimes hindered repair work.

[0009] In addition, the rotary drilling device to which the hose is connected has a problem that the workability at high places is poor because the weight becomes heavy and the drawing operation is troublesome. Furthermore, the conventional rotary drill device is not suitable for performing a relatively simple operation because the above-described complicated setup operation and the like are required.

Further, since the above-mentioned compressors and the like are extremely expensive, it is difficult to have a large number of compressors, and even a large site needs to be handled by a small number of compressors. For this reason, the repair work has a problem that it takes a lot of construction days and the construction cost becomes enormous. Furthermore, in the conventional rotary drilling device, for example, in the case of waterproofing work, when filling a drilled repair hole with a waterproofing agent, it takes time for the cooling water remaining inside the repair hole to dry. There was a problem that it became long. Further, the conventional rotary drilling device has a problem that it is difficult to use the drilling device for drilling a repair hole in a ceiling or the like because a large amount of cooling water is used.

By the way, the above-mentioned prior application disclosed in Japanese Patent Application Laid-Open No. Sho 60-26
No. 2608, “Rotation Drilling Method”,
For example, by using a low-temperature liquefied gas for cooling the drill, it is possible to solve the problem caused by the treatment of the hose as compared with the case where cooling water is used. However, even in this rotary drill device, a compressor or the like is required in order to eject gas with sufficient pressure in the drilling, so that the problem that not only the entire device becomes expensive but also the handling is troublesome is solved. It is not possible. In addition, this rotary drilling device has a problem that it is difficult to confirm a drilling position due to a dustproof film for preventing scattering of generated dust, and it is not possible to perform an accurate drilling operation such as a repair hole.

The rotary drilling apparatus disclosed in another prior application, Japanese Patent Application Laid-Open No. Hei 1-206005, entitled "Drilling Method for Concrete Buildings" can efficiently remove chips from the drilled repair hole. It also requires expensive and heavy compressors.

[0013] Under such circumstances, the applicant of the present invention has proposed a method in which a liquid is mixed with a low-boiling point organic solvent, and a coolant liquefied and sealed in an aerosol can is jetted and supplied from the tip of a drill pit to a wall surface. We have developed a rotary drill device for drilling holes. This rotary drilling device does not require a compressor, a water source for cooling or a tank, etc., and is extremely easy to handle because it is small and light in weight as a whole. Drying time for drilled repair holes and setup time for work In order to greatly improve work efficiency.

[0014] By the way, this rotary drilling apparatus is not as many as the rotary drilling apparatus using cooling water.
There is a problem in that the drilling operation generates gel-like dust in which the cutting powder and the liquid are mixed, and the gel-like dust stains a wall surface, a floor, and the like. In addition, gel-like dust, for example, when drilling a repair hole in a ceiling or the like, falls down to an operator working directly below, significantly reducing work efficiency and making it impossible to accurately drill the repair hole. Cause.

Further, an attachment member for reducing noise and preventing scattering of generated gel-like dust by being in close contact with a wall surface or the like is attached to the tip of the rotary drill device. However, this attachment member has a problem that it is difficult to make good contact with the wall surface or the like in a good condition because the wall surface or the like on which the repair hole is drilled generally presents various states such as unevenness and inclination. Was.

Accordingly, the present invention provides an inexpensive, compact, and lightweight rotary drilling apparatus that can drill a hole for repair or the like by extremely simple work on a wall surface, a ceiling, or the like of a building. It is an object of the present invention to provide a rotary drill device improved in quality.

[0017]

SUMMARY OF THE INVENTION A rotary drill device according to the present invention, which has achieved the above object, comprises a liquid material, which is mixed with a low-boiling organic solvent, and is provided with a coolant filled in an aerosol can in a liquefied state. Drilling is performed on the wall or the like while spraying and supplying from the tip of the drill pit. The rotary drilling device has a drill pit that penetrates the bottom and faces the inside, and its outer peripheral wall has an axis that is gradually inclined from the opening side to the bottom side with respect to the axis orthogonal to the axis of the drill pit. A substantially cup-shaped cover member provided with a dust discharge port formed of an inclined through hole extending along the entire surface thereof, and a substantially ring-shaped cover member fitted into an opening of the cover member and tightly fitted around a perforated portion such as a wall surface at the time of perforation. Attachment member, bracket member for attaching the cover member, and dust for storing gel-like dust that flows from the perforated portion of the wall or the like by the drilling operation of the drill pit, flows into the inside of the cover member, and flows out through the dust outlet. A storage container, and the dust storage container is attached to the bracket member in an inclined state substantially parallel to the axis of the dust discharge port.

Further, the rotary drill device according to the present invention has a substantially cup-shaped cover member having a drill pit penetrating through the bottom portion and having a dust discharge port provided on an outer peripheral wall thereof. A substantially ring-shaped attachment member made of an elastic material whose base end is fitted into the opening of the cover member and whose front end is tightly fitted around the perforated portion such as a wall surface at the time of perforation. In addition, the attachment member is configured such that the attachment portion that is in close contact with the wall surface or the like is in contact with the outer peripheral portion of the perforated portion, and the inner peripheral attachment portion having a somewhat rigidity is in contact with the outer peripheral portion of the inner peripheral attachment portion. And a flexible outer peripheral attachment portion.

According to the rotary drill device of the present invention having the above-described configuration, the drill is cooled and drilled by the heat of vaporization of the coolant injected and supplied from the drill pit to the drilled portion such as the wall surface. By removing the cutting powder from the inside of the hole, the efficiency of the drilling operation is improved. Rotary drilling equipment eliminates the need for tanks for storing cooling water, hoses or compressors for supplying compressed air, shortening the setup time for installing these equipments, and simplifying work and drilling Quick drying greatly reduces the working time.

Since the dust container is mounted so as to be inclined with respect to the axis of the drill pit, for example, the dust storage container is mounted in a case where it is pierced in a vertical wall surface and in a case where it is pierced in a ceiling surface. It is possible to store the gel-like dust generated from the perforated portion without changing the size. Therefore, the rotary drill device can be used as it is in various places, and its usability is greatly improved.

Regarding the attachment member, regardless of the state of the wall surface to be pierced, the outer peripheral attachment portion having flexibility first comes into close contact with the wall surface, and then the inner peripheral attachment portion having somewhat rigidity abuts against the wall surface. As a result, the outer peripheral portion of the perforated portion is covered, so that the gel-like dust generated from the perforated portion is reliably prevented from flowing down along the wall surface or the like. The attachment member suppresses generation of noise by maintaining close contact with a wall surface or the like. Therefore,
The rotary drill device simplifies the abutment operation on a wall surface or the like, and its usability is greatly improved.

[0022]

Embodiments of the present invention will be described below with reference to the accompanying drawings. A rotary drill device 1 shown as an embodiment of the present invention includes, for example, a wall surface or a ceiling of a concrete building (hereinafter, collectively referred to as a wall surface 100).
When repairing work such as cracking or tile peeling that occurred in the above, or lifting of the exterior wall, etc., when the repairing hole 101 for repairing for filling these places with an adhesive or driving an anchor pin is used. used.

As shown in FIG. 1, the rotary drill device 1
It comprises a drill body 2, an attachment 3, and a cooling unit 4. As will be apparent from the following description, the rotary drill device 1 can be configured as a so-called attachment device using the attachment unit 3 in combination with the rotary drill device by configuring the drill body 2 with a commercially available rotary drill device. Can be configured.

The drill body 2 is constructed in the same manner as a commercially available rotary drill device, and has a hand-held portion 2b provided on one side of a housing 2a and a power switch 2 provided on the hand-held portion 2b.
Although not shown, a drive motor and a rotating shaft (not shown), a well-known drill chuck mechanism 5, and the like are built in the housing 2a. Power is supplied to the drive motor of the drill body 2 by operating the power switch 2c, and the rotary shaft is driven.

The drill chuck mechanism 5 comprises a plurality of chucking levers provided at the tip of the rotating shaft, as is well known. In the drill chuck mechanism 5, these chucking levers converge and expand by the operation of the chucking key, and as shown in FIG. 2, a rotary shaft 6 of the attachment unit 3 described later is attached and detached.

The attachment portion 3 has a cylindrical housing 7 for rotatably housing the rotating shaft 6, one end of which is connected to the rotating shaft 6, and the other end of which protrudes from the distal end of the cylindrical housing 7. The exposed drill head 8 and the drill guide mechanism 9
And each member and each mechanism such as a dust scattering prevention mechanism 10 attached to the tip of the drill head unit 8. Although not described in detail, a drive shaft for connecting the drill head unit 8 and the rotating shaft 6 to each other coaxially and integrally rotating within the cylindrical housing 7 of the attachment unit 3. A member and a bearing mechanism, and an oil seal mechanism or an automatic valve mechanism for maintaining the bearing mechanism in a liquid-tight manner are provided.

Although not shown, the drive shaft member and the bearing mechanism are respectively provided with coolant channels for supplying the coolant supplied from the cooling unit 4 to the drill head unit 8. The opening and closing of these coolant channels are controlled by an automatic valve mechanism.
The automatic valve mechanism has a configuration in which the drill head 8 has a wall surface 100 when drilling.
In the state where the coolant is pressed, the coolant channel is opened to supply coolant to the drill head 8.

As shown in FIGS. 1 and 2, the attachment portion 3 has a mounting flange 7a formed at one end of the cylindrical housing 7 joined and fixed to a mounting flange 2d formed integrally with the housing 2a. As a result, it is combined with the drill body 2 in a cantilever state. Attachment part 3
2, a handle 11 is provided on an outer peripheral portion of the cylindrical housing 7, and a supply pipe member 13 to which a hose 12 for supplying a coolant from the cooling unit 4 is connected as shown in FIG. 2 is provided. . In the rotary drill device 1, when performing a drilling operation on a repair hole 101 or the like to be described later on the wall surface 100, an operator grips the hand-held portion 2 b of the drill body 2 with one hand and grips the handle 11 with the other hand. Thereby, the drill head 8 is brought into a stable state with respect to the drilling position.

The drill head 8 comprises a long-axis drill pit support member 14 and a drill pit 15 attached to the tip of the drill pit support member 14. As shown in FIG. 3, the drill pit support member 14 has an elongated cylindrical shape in which a coolant flow path 14a communicating with a coolant flow path (not shown) in the cylindrical housing 7 is formed over the entire length in the axial direction. Present. This drill pit support member 14
The base end is connected to the rotating shaft 6 via a drive shaft member (not shown). Therefore, the drill pit support member 1
4 is integrally rotated by turning on the power and turning the rotation shaft 6.

The drill pit 15 is formed in a cylindrical shape by a sintered alloy in which diamond grains are mixed, and has a coolant passage (injection port) 15 a communicating with the coolant passage 14 a of the drill pit support member 14 inside. Are formed over the entire length in the axial direction. The drill pit 15 has a reverse screw formed on the outer periphery of the base end, and the drill pit support member 1
4 is attached by being screwed into an inner peripheral screw provided on the inner peripheral wall. Therefore, the drill pit 15
When worn due to the drilling operation, it can be separated from the drill pit support member 14 and replaced. In order to efficiently discharge the cutting powder generated from the repair hole 101 from the inside to the outside, a slit-like groove is formed in the drill pit 15 in the axial direction from the tip end thereof.

For example, the drill pit 15 is provided on the wall 100
In the case where a repair hole 101 of 4.5 mm to 8 mm is formed, the inner diameter is set to 0.3 mm or less. When drilling a repair hole of about 18 mm to 20 mm, the inner diameter of the drill pit 15 is 0.5 mm. The drill pit 15 injects a coolant into the perforation from the injection port 15a with a sufficient injection pressure.

The cooling unit 4 includes two aerosol cans 16A and 16B (hereinafter, collectively referred to as aerosol cans 16) enclosing a coolant, a holder casing 17 for accommodating the aerosol cans 16 therein, an aerosol can 16 It is composed of a hose 12 and the like connecting the attachment 16 and the attachment part 3. When the aerosol can 16 is loaded into the holder casing 17, the cooling unit 4 pushes the stem of the aerosol can 16 so that the enclosed coolant can be supplied.

The coolant is supplied from the aerosol can 16 to the inside of the attachment portion 3 via the hose 12 when the automatic valve mechanism is opened by the drilling operation, and the coolant flows in the drill pit support member 14. Repair hole 10 drilled from the injection port 15a of the drill pit 15 through the path 14a
1 is injected and supplied. The coolant discharges the cutting powder generated by the injection pressure from the inside of the repair hole 101 to the outside, and also efficiently cools the drill pit 15 by the heat of vaporization of a low-boiling organic solvent described later.

The aerosol can 16 has a legal regulation in the initial storage state in which the upper limit of the filling content is 1000 ml or less and the filling rate is 90% or less. 800 ml to 850
Milliliter of filling is filled. The aerosol can 16 is composed of a liquid obtained by mixing water as a base material with, for example, methanol, ethanol or various ester materials, a low boiling organic solvent such as dimethyl ether, and / or a soluble liquefied gas such as dimethyl ether. The coolant to be cooled is enclosed. The low-boiling organic solvent is mixed at a ratio of 5% by weight to 90% by weight with respect to the cooling water, and exhibits a molten or emulsified state depending on its properties. In addition, the soluble liquefied gas is 5% by weight to 6% by weight with respect to the cooling water.
0% by weight is mixed.

For example, a coolant obtained by dissolving dimethyl ether in cooling water has a very high fluidity as compared with a coolant consisting of only cooling water. Therefore, the diameter of the drill pit 15 is reduced to about 1/10 of 0.2 mm. Degree. In the drill pit 15, the injection pressure of the coolant injected from the injection port 15a is 2.0 Kg /
Even if it is about ² cm ² , the perforation efficiency is sufficiently maintained.
Therefore, the rotary drill device 1 can be used for a long period of time, and an average of 25 or more repair holes 101 can be formed in the wall surface 100 by one aerosol can 16.

Further, the aerosol can 16 is filled with an inert gas such as carbon dioxide gas or nitrogen gas in order to minimize a decrease in the injection pressure of the coolant even when the outside air temperature is low. . The inert gas increases the internal pressure of the aerosol can 16 to 6.0 kg / cm at an outside air temperature of 25 ° C.
^An amount sufficient to keep it in the range of ^{2 to} 6.5 kg / cm ² is filled.

The coolant is sprayed and supplied to the repair hole 101 to be drilled, so that the coolant is atomized by the action of the mixed auxiliary agent. The coolant is exposed to the outside air and the frictional heat of the drill pit 15 due to the drilling operation. Evaporate and diffuse rapidly in the interior. The coolant cools the drill pit 15 by the heat of vaporization and maintains the drill pit 15 in a good state to repair the hole 10.
1 is performed. In addition, since the coolant is vaporized in the repair hole 101 and its capacity rapidly expands to several hundred times, the coolant exhibits a state in which the coolant is injected into the repair hole 101 at a higher pressure, and Efficiently discharges chips and the like together with the cooling water.

The coolant remaining inside the drilled repair hole 101 is azeotropic with a low-boiling organic solvent and liquefied gas, which promotes evaporation of the cooling water of the base material. The inside of 101 is dried in a short time. In the rotary drill device 1, the time required for drilling the repair hole 101 is substantially equal to that in the case of the conventional rotary drill device, but the setup time is greatly reduced and the efficiency is improved by a simple operation. In addition, since the rotating drill device 1 also has a drying time of the repair hole 101 of about one-tenth, the construction period is significantly reduced.

Furthermore, the rotary drill device 1 is small and lightweight, and does not require the routing of a long hose for supplying cooling water or compressed air, and can safely perform work on high places such as walls and ceilings. And Furthermore, since the rotary drill device 1 does not require a large amount of cooling water, it can be used even at a site without a water supply facility, and can also be used to prevent water leakage disasters such as downstairs due to spilled cooling water and contamination of the site. There is no inconvenience.

The drill guide mechanism 9 includes a drill pit 15
Acts so as to be accurately positioned with respect to the perforation point.
As shown in FIG. 1, the drill guide mechanism 9 includes a guide cylinder member 18 supported in a cantilever state on the cylindrical housing 7 in parallel with the drill pit support member 14, and the guide cylinder member 18.
Guide shaft member 19 penetrating through the coil spring 2
0 and the like.

The guide shaft member 19 includes a bracket member 22 whose distal end constitutes a dust scattering prevention mechanism 10 described later.
Is fixed through the stopper. In addition, the guide shaft member 19 has a length dimension such that the distal end thereof is located substantially on the same plane as the drill pit 15 in a state where the guide shaft member 19 is most protruded from the guide cylinder member 18. The coil spring 20 is mounted between the guide cylinder member 18 and the bracket member 22 in a slightly compressed state. The coil spring 20 connects the bracket member 22 to the cylindrical housing 7.
Bias in the direction away from.

The drill guide mechanism 9 configured as described above adjusts the relative position between the drill pit 15 and the cover member 21 which constitutes the dust scattering prevention mechanism 10 when drilling the repair hole 101 which will be described later. I do. That is, the guide mechanism 9 is configured such that the drill bit 15
The coil spring 20 is gradually compressed by the cover member 21 as it enters the inside of the wall surface 100 with the perforation. The guide mechanism 9 includes the coil spring 20
The cover member 21 is moved to the wall surface 100 by the elastic force
To maintain the close contact. Thus, the drill guide mechanism 9 has an effect of maintaining the prevention of dust scattering and reducing the generation of vibration noise.

The rotary drill device 1 pierces the repair hole 101 while jetting and supplying the coolant from the drill pit 15, so that chips generated from the repair hole 101 mix with the coolant to exhibit a so-called gelation. The resulting gel-like dust 102 is generated. The rotary drill device 1 greatly suppresses the generation of the gel dust 102 because the above-described coolant is used, but the dust scattering prevention mechanism 10 reliably prevents the scattering or dripping along the wall surface 100. I do.

As shown in FIGS. 3 to 7, the dust scattering prevention mechanism 10 includes a cover member 21 and a bracket member 22.
, Attachment member 23, discharge guide member 24
And a member such as a dust discharge pipe member 25 and a dust container 26. The cover member 21 is formed of a synthetic resin material having high mechanical rigidity, a lightweight metal, or the like, and has a substantially cup shape. The cover member 21 is combined with a bracket member 22 to be described later such that the bottom surface portion 21a faces the drill body portion 2.

As shown in FIGS. 4 and 5, the cover member 21 is provided with a bearing hole 21b at the center of the bottom surface 21a, so that the tip of the drill pit support member 14 constituting the drill head 8 is formed. Part is penetrated into the internal space 21c. The cover member 21 may be provided with, for example, an appropriate anti-friction member in the bearing hole 21b in order to reduce frictional resistance with the drill pit support member 14 penetrated.

The cover member 21 has an attachment member 2 (described later) formed in an opening 21d forming an internal space 21c.
3 is attached. In addition, the cover member 21 includes
A bulged portion 21e having a substantially right-angled triangular cross section is integrally formed below the outer peripheral portion thereof. Further, the swelling portion 21e is provided with a dust discharge port 21f that penetrates outward from the internal space 21c and discharges the gel-like dust 102 generated by the punching operation of the repair hole 101 described later from the internal space 21c. Have been.

As shown in FIGS. 4 and 5, the dust outlet 21f extends along an axis which is gradually inclined from the opening 21d side toward the bottom surface 21a side with respect to the axis orthogonal to the axis of the drill pit 15. The inclined hole is formed on the outer peripheral portion of the cover member 21. The dust discharge port 21f has, for example, an inclination angle of 45 degrees, and has an inner peripheral screw 21g formed on an inner wall thereof as shown in FIG.

The cover member 21 constructed as described above
The bottom part 21 a is attached to the bracket member 22. The bracket member 22 is formed by bending a metal plate or the like. As shown in FIGS.
A mounting portion 22b integrally protruding from the lower outer peripheral portion of the main surface portion 22a in a slightly inclined state;
And a guide portion 22c integrally formed at the end of the guide portion 22c, and has a substantially ladle-shaped cross section.

The main surface portion 22a has a disk shape having a diameter larger than that of the bottom surface portion 21a of the cover member 21, and a shaft hole 22d is formed in a central portion thereof. This shaft hole 22d
When the cover member 21 is mounted on the bracket member 22, the drill pit support member 14 is positioned coaxially with the bearing hole 21 b of the bottom surface 21 a.
Through. As shown in FIG. 6, a pair of mounting holes 2 into which a set screw (not shown) for mounting the cover member 21 with the shaft hole 22d interposed therebetween is screwed into the main surface portion 22a.
2e and 22e are provided. Further, the main surface portion 22a
Is provided with a guide hole 22f which is located on the side of one of the mounting holes 22e and penetrates the distal end of the guide shaft member 19.

By the way, in the rotary drill device 1,
Since the cover member 21 is in close contact with the wall surface 100 when the repair hole 101 to be described later is drilled, the bracket member 22 to which the cover member 21 is attached is present at the line of sight of the worker, and the gap between the drill pit 15 and the repair hole 101 is formed. It is difficult to directly confirm the positioning or the drilling operation. Therefore, the bracket member 22 is formed to have a substantially semi-circular shape by notching the upper portion 22g of the main surface portion 22a corresponding to the position of the operator's line of sight horizontally as shown in FIG. . The bracket member 22 is configured such that the repair hole 101 is accurately drilled by notching the upper portion 22g without hindering the line of sight of the operator.

The mounting portion 22b constitutes a mounting portion for the dust container 26 as described later, and more specifically, is connected to the main surface portion 22a with an inclination corresponding to the inclined bottom surface of the bulging portion 21e of the cover member 21. Has been established. The mounting portion 22b is provided with a discharge guide hole 22h located coaxially with the dust discharge port 21f when the cover member 21 is mounted on the bracket member 22. This discharge guide hole 22
h has an inner diameter substantially equal to the outer dimension of the dust discharge pipe member 25 described later.

The guide portion 22c is formed so as to stand substantially parallel to the tip of the mounting portion 22b, and extends above a dust outlet 28d of the dust container 26 described later.

The attachment member 23 is shown in FIGS.
As shown in FIG. 3, the entirety of the cover member 21 is formed of an elastic material such as rubber so as to maintain the adhesion of the cover member 21 to the wall surface 100 on which the repair hole 101 is formed, and is generated between the cover member 21 and the wall surface 100. Reduce the generation of vibration noise. The attachment member 23 is formed as a separate member from the cover member 21 and is combined with the cover member 21. For example, when the cover member 21 is formed of a synthetic resin material, the attachment member 23 is formed integrally with the opening. You may.

The outer diameter of the attachment member 23 is made substantially equal to the inner diameter of the cover member 21.
a is integrally formed so as to protrude. Attachment member 2
3 is assembled to the cover member 21 as shown in FIG. 4 by fitting its base end 23b into the opening 21d and joining it with an adhesive. In addition, the locking flange portion 23a functions to regulate the fitting amount of the base end portion 23b and to allow the attachment member 23 to be attached to the cover member 21 while maintaining the coaxial state.

The attachment member 23 constitutes an attachment portion in which the front end portion 23c sandwiching the locking flange portion 23a is in close contact with the wall surface 100 around the repair hole 101. As shown in FIGS. 4 and 5, the attachment portion 23c includes an inner peripheral attachment portion 23d and an outer peripheral attachment portion 23e. Inner circumference attachment part 23
As shown in FIG. 5, d is formed as a small-diameter ring-shaped convex portion having a slightly larger thickness dimension in which the inner peripheral wall side is an axial vertical wall and the outer peripheral wall side is gradually thickened. Therefore, the inner peripheral attachment portion 23d is formed with a little rigidity as a whole than the above configuration.

The inner peripheral attachment portion 23d has the repair hole 1
The so-called main attachment part at the time of the drilling operation of No. 01 is constituted. That is, the inner peripheral attachment portion 23d
Since it has some rigidity, the state in which it is abutted against the wall surface 100 is firmly held, and it is possible to prevent a situation in which the rotary drill device 1 fluctuates during the drilling operation and makes accurate drilling of the repair hole 101 impossible.

As shown in FIG. 5, the outer peripheral attachment portion 23e has a slightly larger projection than the inner peripheral attachment portion 23d and is thinner as a whole. The outer peripheral attachment portion 23e is tapered such that the inner peripheral wall side gradually becomes wider toward the opening. Therefore, the outer peripheral attachment portion 23e has sufficient flexibility in the radially expanding direction.

The attachment member 23 is provided with the double ring-shaped attachment portion 23c as described above, so that when the repair member 101 is pierced by being pressed against the wall surface 100, the outer peripheral wall surface of the repair hole 101 is formed. Make sure they adhere. That is, the attachment member 23 is
First, the inner peripheral attachment portion 23d is abutted against the wall surface 100 in a state where the outer peripheral attachment portion 23e is abutted against the wall surface 100 and is elastically deformed. For example, even when the wall surface 100 is not a smooth flat surface, the outer peripheral attachment portion 23e retains the close contact with the wall surface 100 by being elastically deformed in the radially increasing direction according to the inclination and unevenness.

The discharge guide member 24 is formed of a disk-shaped member having substantially the same diameter as the internal space 21c of the cover member 21, and has a guide hole 24a passing through the center thereof. This discharge guide member 24 is joined and fixed to the inner surface of the bottom surface 21a of the cover member 21, as shown in FIG. The guide hole 24a is positioned coaxially with the bearing hole 21b on the cover member 21 side when the discharge guide member 24 is combined with the inside of the cover member 21 to move the drill pit support member 14 to its internal space 21c. Let through.

The discharge guide member 24 is formed as an inclined surface whose main surface 24b is gradually inclined from above to below. The main surface 24b has an inclination angle of 45.
When the discharge guide member 24 is combined with the cover member 21, the dust discharge port 21
It is configured to be continuous with f. Although the discharge guide member 24 is formed as a separate member from the cover member 21, the discharge guide member 24 may be formed integrally with the inner surface of the bottom surface 21 a of the cover member 21.

The dust discharge pipe member 25 is formed of a metal pipe or a pipe member formed of a synthetic resin material having mechanical and chemical characteristics.
Has an outer diameter dimension substantially equal to the inner diameter dimension of the dust discharge port 21f formed at the bottom. The dust discharge pipe member 25 has a screw portion 25a formed at the upper end of the outer periphery.
a is screwed to the inner peripheral screw 21g of the dust discharge port 21f to be combined with the cover member 21.

When the dust discharge pipe member 25 is assembled with the cover member 21, the upper end opening 25b is exposed to the internal space 21c. The dust discharge pipe member 25 has a lower end provided with a lower end opening 25c inserted into the dust storage container 26 in a state where the dust storage container 26 is attached to the bracket member 22 as described later. The dust discharge pipe member 25 has a locking flange 25d integrally formed on an outer peripheral portion thereof, and the locking flange 25d is formed on the bulging portion 21 of the cover member 21 as shown in FIG.
The amount of screwing into the dust discharge port 21f is restricted by being locked to the bottom surface of e.

The dust discharge pipe member 25 is assembled with the cover member 21 because the dust discharge port 21f is formed on the cover member 21 with an inclination angle of 45 degrees as described above. , A 45 degree angle is similarly applied.

The dust container 26 includes a container body 27 formed of a synthetic resin material into a wide-mouthed container shape, and a lid 28. The lid 28 has a cap shape including a main surface portion 28a sufficient to close the opening of the container main body 27 and a flange portion 28b formed on a peripheral edge thereof and formed with an inner peripheral thread. This dust container 26 is
It is attached to the attachment portion 22b of the bracket member 22 described above. That is, the dust container 26 is
Is screwed or joined to the bottom surface of the mounting portion 22b, and is attached to the bracket member 22 by screwing the opening 27a of the container body 27 into the lid 28 as shown in FIG.

The dust container 26 is mounted on the bracket member 22 because the mounting portion 22b of the bracket member 22 has a 45-degree downward inclination with respect to the axis of the drill pit support member 14 as described above. In this state, as shown in FIG. 3, the container main body 27 also assumes a state of being inclined forward and downward. A repair hole 101 is provided in the container body 27.
As a result of the perforation, the gel dust 102 flows into the inside through the dust discharge pipe member 25, and temporarily stores the dust.

For example, the rotary drill device 1 has a repair hole 101 having an inner diameter of 6 mm and a depth of 60 mm in the wall surface 100.
When drilling a hole, 10 cc of coolant is used for each repair hole 101 and about 0.8 g of dust is generated. Therefore, the dust container 26 has gel-like dust 10 generated from an average of 50 or more repair holes 101 that can be pierced by two aerosol cans 16 therein.
It has enough capacity to store two.

As shown in FIG. 7, the lid 28 has a main surface 28a, a fitting hole 28c through which the dust discharge pipe member 25 penetrates, and a gel dust stored in the container body 27. A discharge port 28d for discharging 102 is provided. The fitting hole 28c is formed so that the lid 28 is
In the state in which the mounting portion 22b is attached to the mounting portion 22b,
In the discharge guide hole 22h.

When the cover 28 is attached to the bracket member 22, the discharge port 28d is
It is opened so as to be located on the 2c side. The guide portion 22c extends above the outlet 28d as described above, and acts to prevent foreign matter and the like from entering the inside of the container body 27.

The above-mentioned dust container 26 is constituted by the main container 27 and the lid 28.
The function formed in 8 may be formed integrally with the bracket member 22. That is, the bracket member 22 is provided with a screw portion for attaching and detaching the container main house 27 to and from the attachment portion 22b, a fitting hole through which the dust discharge tube member 25 penetrates, or a discharge port for discharging the gel dust 102. Accordingly, since the bracket member 22 has a relatively complicated shape, it is integrally formed of a synthetic resin material having mechanical characteristics.

The dust scattering prevention mechanism 10 configured as described above can be used with the coil spring 20 of the drill guide mechanism 9 when the repair hole 101 is drilled in the wall surface 100.
The cover member 21 is pressed against the wall surface 100 via the bracket member 22 receiving the increased elastic force. The cover member 21 covers the periphery of the drill pit 15, and the attachment member 23 attached to the opening 21 d is in close contact with the wall surface 100. Specifically, the attachment member 23 is brought into contact with the wall surface 100 in a state where the inner peripheral attachment portion 23d is slightly elastically deformed due to its material properties, and is closely attached to the wall surface 100 in a state where the outer peripheral attachment portion 23e is sufficiently elastically deformed. I do.

The rotary drill device 1 is, for example, a vertical wall 1
When drilling the repair hole 101 at 00, the drill pit 15 is applied in a horizontal state with respect to the drilled portion as shown in FIG. The attachment member 23 covers the outer peripheral portion of the drill pit 15 and is in close contact with the wall surface 100. The dust container 26 attached to the bracket member 22 is inclined at an angle of 45 degrees with respect to the wall surface 100.

In the rotary drill device 1, when the power switch 2 c of the drill body 2 is operated, the drill pit support member 14 is driven to rotate via the rotary shaft 6 and the drill pit 15
Thereby, the repair hole 101 is drilled in the wall surface 100.
Further, in the rotary drill device 1, the coolant is supplied from the cooling unit 4, and the coolant is injected and supplied to the inside of the repair hole 101 drilled from the injection port 15 a of the drill pit 15 via the coolant channel 14 a. You. The rotary drill device 1 includes a repair hole 10
As the holes 1 are pierced, the attachment members 23
Cover member 2 while maintaining the close contact state between
1 and the bracket member 22 move toward the drill body 2 against the elastic force of the coil spring 20.

The dust generated from the drilled repair hole 101 is mixed with the cooling water of the base material constituting the coolant injected and supplied from the drill pit 15 to form the gel dust 102.
The gel dust 102 has a wall surface 100 because the periphery of the repair hole 101 is covered by the attachment member 23.
And gradually flows into the internal space 21c of the cover member 21 without flowing down. Therefore, in the rotary drill device 1, scattering of dust generated from the repair hole 101 is prevented.

Further, a part of the gel dust 102 is scattered in the internal space 21 c of the cover member 21 due to the rotation of the drill pit 15 and the action of the coolant injected and supplied to the repair hole 101. As described above, the discharge guide member 24 having the inclined surface on the bottom surface 21a is attached to the cover member 21. Therefore, the gel dust 102 scattered in the internal space 21c of the cover member 21 flows into the dust discharge port 21f along the surface of the discharge guide member 24.

The gel dust 102 is, as shown in FIG.
The dust outlet 21 from the internal space 21c of the cover member 21
f, and flows out into the dust container 26 via the dust discharge pipe member 25 and is stored therein. Dust storage container 26
Since the outlet 28d provided in the lid 28 is open, the internal air escapes from the outlet 28d and flows in the gel dust 102 smoothly as the gel dust 102 flows in. Therefore, in the rotary drill device 1, when drilling the repair hole 101, the gel dust 1
02 is prevented from scattering on the wall surface, the floor, and the like to contaminate the surroundings.

The rotary drill device 1 is, for example,
When the repair hole 101 is to be drilled, the drill pit 15 is applied in a state perpendicular to the drilled portion as shown in FIG. Attachment member 23 includes drill pit 15
And is closely attached to the ceiling surface 100. Since the dust container 26 is attached to the bracket member 22 at an angle of 45 degrees with respect to the drill pit 15, the dust outlet 28d provided in the lid 28 faces downward as shown in FIG. As a result, the gel dust 102 accumulated inside the dust container 26 does not spill.

The gel-like dust 102 generated from the drilled repair hole 101 does not scatter around the repair hole 101 because the periphery of the repair hole 101 is covered by the attachment member 23, and flows into the internal space 21 c of the cover member 21. Fall. The gel dust 102 smoothly flows out to the dust discharge port 21f along the inclined surface of the discharge guide member 24 assembled to the bottom surface 21a of the cover member 21. Therefore, the gel-like dust 102 is
Does not overflow from the internal space 21c, but flows down from the dust discharge port 21f into the dust container 26 and is stored therein.

In the rotary drill device 1, even when the repair hole 101 is formed in the ceiling surface 100, the generated gel dust 102 is reliably stored in the dust container 26. Therefore, the rotary drill device 1 prevents the gel dust 102 from dropping on the floor or the like and contaminating the dust, and also prevents the dust from falling to the worker, thereby preventing the work efficiency from being reduced.

The rotary drill device 1 is configured such that the operator holds the hand-held portion 2b of the drill body 2 downward while holding the hand-held portion 2b.
2 can be discarded. That is, when the rotary drill device 1 is turned downward, as shown in FIG. 10, the open discharge port 28 d is positioned below, and the gel-like dust 102 accumulated in the dust container 26 is reduced by its own weight. Outflow from 28d.

Therefore, the rotary drill device 1 can move the container body 2 from the lid 28 attached to the bracket member 22.
It is not necessary to perform an operation of removing the dust 7 and discarding the gel dust 102 accumulated inside. Rotary drill device 1
For example, when performing a drilling operation at a high place or the like, it is possible to eliminate the trouble that the worker gets down from a scaffold or the like in order to discard the gel dust 102 accumulated in the dust storage container 26 each time. Work is made possible and the efficiency is achieved.

The rotary drill device 1 can easily dispose of the gel-like dust 102 from the inside of the dust container 26 as described above, so that the large-sized dust container 26 becomes unnecessary. The small dust container 26 is a rotary drill device 1
In order to simplify the handling of the drill and to prevent the weight of the rotary drill device 1 from increasing, the burden on the operator is reduced.

The dust container 26 is attached at an angle of 45 degrees with respect to the axis of the drill bit 15 via the bracket member 22 as described above. In addition, the dust container 26 has the container body 27 formed in a wide-mouthed container shape as described above,
In particular, the space capacity for storing the gel dust 102 during the drilling operation of the ceiling 100 shown in FIG. 9 is reduced.

As shown in FIG. 11, the rotary drill device 1 also employs a flask-shaped container body 30 whose inner diameter gradually increases toward the bottom surface. The flask-shaped container main body 30 has a larger bottom surface capacity than the wide-mouthed container main body 27, so that more gel-like dust 102 can be stored inside. Therefore, the flask-shaped container body 30 enables the drilling operation of more repair holes 101 even when, for example, there is no appropriate disposal place of the gel dust 102 during the drilling operation at a high place. I do.

Incidentally, the gelled dust 102 that has flowed into the dust storage containers 26 and 30 may be solidified inside. Therefore, the dust container 26, 30
By removing the container main body 27 from the lid 28 and cleaning the inside thereof, the container main body 27 can be used any number of times.

The rotary drill device 1 also performs a work of drilling a repair hole 101 on a wall surface 100 on which tiles are attached, for example. As shown in FIG. 12, the tiled wall surface 100
The tile pieces 103 are adhered to the surface of the wall surface 100, and the gaps 104 between the tile pieces 103 are filled with joints 105. Repair of this tiled wall 100
A repair hole 101 is provided in the joint 105 to maintain the appearance.
Is perforated.

[0086] As described above, the rotary drill device 1 is provided with the gel-like dust 10 generated from the repair hole 101 when the inner peripheral attachment portion 23d and the outer peripheral attachment portion 23e of the attachment member 23 are brought into close contact with the wall surface 100.
2 and the generation of noise. Attachment member 23 includes an outer peripheral attachment portion 23e.
However, it is difficult for the outer peripheral attachment portion 23e to reach the joint 105 and to be in close contact therewith.

Therefore, the rotary drill device 1 has the structure shown in FIG.
As shown in FIG. 2, a second attachment member 35 is attached to the outer peripheral portion of the attachment member 23. The second attachment member 35 is formed of a material that can be largely elastically deformed, such as urethane foam resin, for example, and is formed in a cylindrical shape as a whole. More specifically, the second attachment member 35 has its base end 35a side fitted into the outer periphery of the locking flange 23a of the attachment member 23 and its distal end 35b side fitted into the attachment portion 23c of the attachment member 23.

As shown in FIG. 12, the rotary drill device 1 having the second attachment member 35
By strongly pressing the second attachment member 35 against the surface of the joint 03, a part of the surface 35c is largely elastically deformed and filled into the joint 105. Therefore, in the rotary drill device 1, the adhesion to the wall surface 100 is sufficiently maintained, the gel dust 102 generated from the repair hole 101 is prevented from scattering, and the noise is suppressed.

The third attachment member 36 shown in FIG. 13 is further improved in adhesion to the tiled wall surface 100. That is, the third attachment member 36 is also formed of a material that can be largely elastically deformed, such as urethane foam resin, for example, and is formed in a cylindrical shape as a whole, and is formed on the outer periphery of the locking flange portion 23a of the attachment member 23. Inset.

The third attachment member 36 has a rib-shaped projection 36a integrally protruding in a cross shape on the main surface pressed against the wall surface 100 on which the tiles are attached. The width of these rib-shaped protrusions 36 a is substantially equal to the width of the gap 104 formed between the tile pieces 103. Therefore,
In the rotary drill device 1 provided with the third attachment member 36, when the repair hole 101 is drilled in the joint 105, each of the rib-shaped protrusions 36 a is relatively filled in the gap 104. The rotary drilling device 1 is thereby provided with a gap 10
Also in the four portions, the third attachment member 36 is securely adhered, and the gel-like dust 102 generated from the repair hole 101 is formed.
And the generation of noise.

The above-described second and third attachment members 35 and 36 are formed as separate members from the attachment member 23. These second and third attachment members 35 and 36 have sufficient flexibility due to their material properties. Therefore, only the inner peripheral flange portion 23d is formed on the attachment member 23, and the outer peripheral flange portion 23e is separated from the second attachment member 35 or the third attachment member 3 which is a separate member.
6 may of course be used.

Further, in the above description, the case where the rotary drilling apparatus 1 drills the repair hole 101 for repair in the wall surface or the ceiling surface 100 or the like has been described, but the use is not limited to this. Of course.

[0093]

As described above in detail, according to the rotary drilling apparatus according to the present invention, a liquefied coolant comprising a liquid as a base material and a low-boiling organic solvent mixed therein is supplied from an aerosol can. The coolant was sprayed and supplied from the tip of the drill pit to drill a predetermined hole in a wall or the like, and the coolant was attached in a state inclined with respect to the axis of the drill pit for storing the gel-like dust generated from the drilled portion. A dust container. Therefore, the rotary drilling device is small, lightweight and extremely easy to handle, shortening the drying time and setup time in the hole after drilling, greatly improving the work efficiency, and further improving the safety of workers even when working at high places. As a result, the wall surfaces and floors are prevented from being stained by the gel-like dust generated from the perforated portion, and the treatment is easily performed, so that the usability is greatly improved.

In the rotary drill device, an attachment member which is in close contact with an outer peripheral portion of a perforated portion such as a wall surface to prevent scattering of dust is provided with an inner peripheral attachment portion having a somewhat rigidity, and an outer peripheral portion of the inner peripheral attachment portion. Due to the double ring shape consisting of the outer peripheral attachment part that is in contact with the surface, its adhesion is maintained regardless of the state of the wall surface and the like, and the falling of gel-like dust generated from the perforated part is surely prevented. In addition, the generation of noise is suppressed, and the usability is improved.

[Brief description of the drawings]

FIG. 1 is a main part perspective view showing an embodiment of a rotary drill device according to the present invention.

FIG. 2 is a side view of an essential part showing the rotary drill device with a part cut away.

FIG. 3 is a vertical sectional view of an essential part for explaining a configuration of a dust scattering prevention mechanism provided in the rotary drill device.

FIG. 4 is a vertical cross-sectional view of a main part for explaining constituent members of the dust scattering prevention mechanism.

FIG. 5 is an exploded longitudinal sectional view for explaining constituent members of the dust scattering prevention mechanism.

FIG. 6 is a rear view of the dust scattering prevention mechanism.

FIG. 7 is a vertical sectional view of a dust container provided in the dust scattering prevention mechanism.

FIG. 8 is a vertical sectional view of a main part showing a state in which a vertical wall surface is drilled by the rotary drill device.

FIG. 9 is a vertical sectional view of a main part showing a state in which a hole is drilled in a ceiling surface by the rotary drill device.

FIG. 10 is a longitudinal sectional view of an essential part for explaining a disposal operation of the gel dust accumulated in the dust container in the rotary drill device.

FIG. 11 is a vertical sectional view showing a main part of a dust scattering prevention mechanism to which another dust container is attached.

FIG. 12 is a longitudinal sectional view of a main part showing a dust scattering prevention mechanism to which another attachment member is attached.

FIG. 13 is a main part front view showing a dust scattering prevention mechanism to which another attachment member is attached.

[Explanation of symbols]

1 rotary drilling device, 2 drill body, 3 attachment, 4 cooling, 6 rotating shaft, 8 drill head, 9 drill guide mechanism, 10 dust scattering prevention mechanism,
14 drill pit support member, 14a coolant flow path, 15
Drill pit, 15a injection port, 16 aerosol can, 21 cover member, 21a bottom part, 21c internal space, 21d opening, 21f dust discharge port, 22
Bracket member, 22a main cotton cloth, 22b mounting part,
22g notch, 23, 35, 36 attachment member, 23d inner circumference attachment, 23e outer circumference attachment, 24 discharge guide member, 25 dust discharge pipe member, 26, 30 dust storage container, 27 container body, 28 lid, 28c fitting hole (inlet hole), 28d outlet, 100 wall surface, 101 repair hole, 102 gel dust

Claims (6)

[Claims] 1. A liquid is mixed with a low-boiling organic solvent and a coolant enclosed in an aerosol can is injected in a liquefied state from a tip of a drill pit to form a hole in a wall or the like. In the rotary drilling device, the drill pit is exposed to the inside while penetrating the bottom portion, and its outer peripheral wall is gradually inclined from the opening side to the bottom portion side with respect to the axis orthogonal to the axis of the drill pit. A substantially cup-shaped cover member provided with a dust discharge port formed of an inclined through hole along an axis extending along the axis of the cover member. A substantially ring-shaped attachment member for closing the periphery of the drill pit; a bracket member to which the cover member is attached; And a dust storage container for storing the gel-like dust flowing into the cover member and flowing out through the dust discharge port, the dust storage container being inclined substantially parallel to the axis of the dust discharge port. A rotary drill device attached to the bracket member in a state. 2. The dust container includes a container body having a substantially wide-mouthed bottle shape, and a lid provided at an opening of the container body. 2. The rotary drilling device according to claim 1, further comprising an inflow port for the gel dust communicating with the outlet, and a dust outlet for discharging the gel dust adjacent to the inflow port. 3. The rotary drilling device according to claim 1, wherein the bracket member is provided with a notch in an upper portion corresponding to a line of sight of an operator during a drilling operation. 4. A perforation is performed on a wall or the like while a liquid is used as a base material and a low boiling point organic solvent is mixed therein, and a coolant enclosed in an aerosol can in a liquefied state is injected and supplied from the tip of a drill pit. In the rotary drilling device, a cover member having a substantially cup-like shape in which the drill pit is made to pass through the bottom surface portion and is provided with a dust discharge port on an outer peripheral wall thereof, and a base end portion of the cover member is provided. A substantially ring-shaped attachment member made of an elastic material that is fitted into the opening and is tightly fitted around a perforated portion such as a wall surface at the time of perforation and closes around the drill pit; An attachment portion that is in close contact with a wall surface or the like is in contact with the outer peripheral portion of the perforated portion and has a slightly rigid inner peripheral attachment portion, and an outer peripheral portion of the inner peripheral attachment portion. A rotary drilling device having a double ring shape including a flexible outer peripheral attachment portion. 5. The outer peripheral attachment part and the outer peripheral attachment part are constituted by members independent of each other, and the outer peripheral attachment member is formed of a foamed synthetic resin material having flexibility. 5. The rotary drill device according to 4. 6. The rotary drill device according to claim 4, wherein the outer peripheral attachment portion has a contact surface having a shape conforming to a shape of a wall surface or the like.