Sheet material drilling tool

Abstract

To easily form a beautiful penetration hole when forming the penetration hole which makes a protrusion penetrate a sheet material.SOLUTION: A sheet material drilling tool 1 for forming a penetration hole which makes a protrusion penetrate a sheet material comprises: a substantially-bottomed cylindrical cylinder body 2; an engagement connection part 3 protrusively formed at a base end side of the cylinder body 2, and detachably engaged with, and connected to an electric rotary tool 10; a ring blade 4 arranged at a tip part of the cylinder body 2; a bulkhead 5 arranged in an intermediate position of the cylinder body 2 in an axial direction; a substantially-nail shaped positioning core material 6 in which a shaft part 62 is inserted into the penetration hole 51 formed in a center of the bulkhead 5, and a head part 61 is arranged at a base end side of the bulkhead 5; and an elastic material 7 for compressing and energizing the positioning core material 6 to a tip side.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a sheet material drilling tool used for drilling holes in sheet material such as a waterproof sheet laid inside a tunnel. [Background technology]

[0002] Conventionally, in work to excavate the natural ground to form a tunnel space, as shown in Figure 4, shoring 201 is erected at predetermined intervals on the inner periphery of the natural ground as the tunnel is excavated, and shotcrete 202 is laid, and a welding base 203 is fixed to the inner periphery of the shoring 201 by welding. The welding base 203 is composed of a disk-shaped fixing base 204 and a bolt portion 205 protruding from one surface of the fixing base 204, and the other surface of the fixing base 204 is fixed to the shoring 201. The bolt portion 205 is responsible for holding the structural reinforcement in the lining concrete that is poured inside the shotcrete 202.

[0003] A waterproof sheet 206 is laid inside the shotcrete 202, in other words between the shotcrete 202 and the lining concrete, to prevent water leakage into the lining concrete side, and the waterproof sheet 206 is laid so as to penetrate the bolt part 205. When the bolt part 205 is penetrated through the waterproof sheet 206, the waterproof sheet 206 is usually stretched and placed over the bolt part 205, and the waterproof sheet 206 is hit with a hammer 209 to form a through hole 207.

[0004] Furthermore, a tool disclosed in Patent Document 1 is known as a tool for drilling holes in sheet material. This tool has a hollow tool body, a ring blade at the tip of the tool body, and a hexagonal column at the head to which a socket for an impact driver can be attached. The tool is connected to the impact driver via the socket, and the impact driver applies striking force and rotational force to the tool, causing the ring blade of the tool to drill holes in the sheet material. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-55524 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when waterproof sheet 206 is placed over bolt portion 205 and waterproof sheet 206 is struck with hammer 209 to form through-hole 207 as described above, jagged burrs 208 are formed around the periphery of through-hole 207, which can cause water leakage W. As a method for forming through-holes in waterproof sheet 206 so as to prevent the formation of such burrs 208, it is possible to use a sheet material drilling tool such as that described in Patent Document 1.

[0007] However, although the sheet material drilling tool of Patent Document 1 can drill a hole neatly in the sheet material when a reaction force can be applied to the back surface of the area where the through hole is formed in the sheet material and the area around the area, it is difficult to form a through hole neatly through a protrusion such as the bolt portion 205 in Fig. 4 that passes through the protrusion. In other words, if a reaction force cannot be applied to the back surface of the area around the area where the through hole is formed in the sheet material, a relative positional misalignment occurs between the drilling tool and the sheet material, making it difficult to drill a hole neatly in the sheet material.

[0008] The present invention has been proposed in consideration of the above-mentioned problems, and aims to provide a sheet material drilling tool that can easily drill clean through holes when forming through holes to pass protrusions through sheet material. [Means for solving the problem]

[0009] The sheet material drilling tool of the present invention is a sheet material drilling tool that forms a through hole for passing a protrusion through a sheet material, and is characterized by comprising: a cylindrical body that is approximately cylindrical with a bottom; an engaging and connecting portion that protrudes from the base end side of the cylindrical body and engages and connects to an electric rotary tool in a freely detachable manner; a ring blade provided at the tip end of the cylindrical body; a partition wall provided at a midpoint in the axial direction of the cylindrical body; a positioning core material that is approximately nail-shaped, with its shaft portion inserted into a through hole formed in the center of the partition wall and its head positioned at the base end side of the partition wall; and an elastic material that presses and urges the positioning core material toward the tip end. With this, the positioning core is brought into contact with the protrusion via the sheet material to perform centering, and the positioning core is pressed toward the tip to center it, and while maintaining the positioning state, the ring blade can form a through hole in the sheet material to pass the protrusion through. Therefore, when forming a through hole in the sheet material to pass the protrusion through, a clean through hole can be easily made.

[0010] The sheet material punching tool of the present invention is characterized in that the length that can be pushed into the base end of the positioning core material is smaller than the protruding length of the specified protrusion inserted into the tip side of the partition of the cylindrical body. This prevents the ring blade of the sheet material drilling tool from coming into contact with the protruding surface of the protrusion, such as the fixed base of the welding base, when a specified protrusion is inserted into the tip side of the partition wall of the cylindrical body to drill a hole in the sheet material, thereby preventing damage to the ring blade.

[0011] The sheet material drilling tool of the present invention is characterized in that a thrust bearing is installed on the base end side of the head of the positioning core material in the cylindrical body, and the positioning core material is pressed toward the tip side by the elastic material via the thrust bearing. With this, when connecting the sheet material hole drilling tool to the electric rotary tool, the thrust bearing prevents the rotational force of the electric rotary tool from being transmitted to the positioning core, preventing the positioning core from shifting, thereby enabling the through hole for the protrusion to be formed more neatly and reliably.

[0012] The sheet material drilling tool of the present invention is characterized in that another thrust bearing is built into the cylindrical body on the base end side of the elastic material. According to this, when connecting to an electric rotary tool and drilling holes with the sheet material drilling tool, the separate thrust bearing prevents the rotational force of the electric rotary tool from being transmitted to the elastic material and positioning core material, thereby more reliably preventing the positioning core material from shifting.

[0013] The sheet material drilling tool of the present invention is characterized in that an opening window is formed on the tip side of the partition wall of the cylindrical body. This allows the drilling process to be performed while visually checking how far the ring blade has penetrated relative to the protrusion, making it possible to more reliably drill the desired hole in the sheet material. Furthermore, because it is possible to visually check how far the ring blade has penetrated relative to the protrusion, even when drilling a hole through a protrusion other than a specified protrusion, it is possible to visually check and prevent the ring blade of the sheet material drilling tool from coming into contact with the protruding surface of a protrusion such as the fixed base of the welding pedestal, thereby preventing damage to the ring blade. [Effects of the Invention]

[0014] According to the sheet material hole punching tool of the present invention, a clean through hole can be easily punched when forming a through hole for passing a protrusion through a sheet material. [Brief explanation of the drawings]

[0015] [Figure 1] (a) is an upper oblique view of an embodiment of a sheet material drilling tool according to the present invention, (b) is a lower oblique view thereof, (c) is a longitudinal cross-sectional view thereof, and (d) is an exploded oblique view of a thrust bearing in the embodiment of the sheet material drilling tool. [Figure 2] 5A and 5B are process explanatory diagrams illustrating a process of drilling holes in a sheet material using the sheet material drilling tool of the embodiment. [Figure 3] 1 is a partial cross-sectional view showing an example of a structure having a waterproof sheet applied using the sheet material hole punching tool of the embodiment. FIG. [Figure 4](a) is a process diagram illustrating the process of inserting the bolt portion of the welding base into a conventional waterproof sheet, and (b) is an oblique explanatory diagram illustrating the installation state of the conventional welding base and waterproof sheet. DETAILED DESCRIPTION OF THE INVENTION

[0016] [Embodiment of Sheet Material Hole Punching Tool] A sheet material drilling tool 1 according to an embodiment of the present invention is a tool for forming through holes for passing a protrusion through a sheet material such as a waterproof sheet, and as shown in FIGS. 1 and 2, the tool has a generally bottomed cylindrical body 2, an engaging and connecting part 3 formed to protrude from the base end of the body 2 and adapted to detachably engage and connect to an electric rotary tool 10, and a ring blade 4 provided at the tip of the body 2. In the illustrated example, the engaging and connecting part 3 is formed in a hexagonal prism shape that can engage and connect to a socket of an electric rotary tool 10 such as an impact driver. In the following description, the engaging and connecting part 3 side of the sheet material drilling tool 1 will be referred to as the base end side, and the ring blade 4 side will be referred to as the tip end side.

[0017] A partition wall 5 is provided at the axially intermediate position of the cylindrical body 2, and a through-hole 51 is formed in the center of the partition wall 5. A substantially cylindrical internal cavity S1 is provided between the base end 21 of the cylindrical body 2 and the partition wall 5, and is surrounded by the base end circumferential wall 22. A substantially cylindrical external cavity S2 that is open at the tip end is provided in an area surrounded by the tip end circumferential wall 23, the ring blade 4, and the partition wall 5, which is located distally of the partition wall 5. The cylindrical body 2 in the illustrated example has a tip portion composed of the partition wall 5, the tip end circumferential wall 23, and the ring blade 4, and a base portion composed of the base end 21 and the base end circumferential wall 22, which are formed by integrating the tip surface of the base end circumferential wall 22 with the partition wall 5 by friction welding. In addition, an opening window 24 is formed in the tip end circumferential wall 23 located distally of the partition wall 5 of the cylindrical body 2, through which a shaft portion 62 of a positioning core member 6 (described later) can be seen.

[0018] A roughly nail-shaped positioning core 6 consisting of a head 61 and a pointed shaft 62 is inserted into the through hole 51 of the partition 5. The head 61 of the positioning core 6 is positioned on the base end side of the partition 5, and the shaft 62 of the positioning core 6 is inserted into the through hole 51 in the center of the partition 5. The positioning core 6 is positioned so that its axis aligns with that of the cylindrical body 2.

[0019] The internal cavity S1 contains an elastic material 7 formed of a compression coil spring that biases the positioning core 6 toward the tip, and the elastic material 7 is capable of contracting in the axial direction of the cylindrical body 2 and elastically restoring to its original shape. A first thrust bearing 81 is contained on the base end side of the head 61 of the positioning core 6 in the cylindrical body 2, in other words, on the base end side of the head 61 of the positioning core 6 in the internal cavity S1. One end of the elastic material 7 abuts against the base end surface of the first thrust bearing 81 in a pressing manner, and the first thrust bearing 81 and the positioning core 6 are biased toward the partition wall 5 by the elastic material 7.

[0020] A second thrust bearing 82, which corresponds to another thrust bearing, is installed inside the cylindrical body 2 on the base end side of the elastic material 7, in other words, on the base end side of the elastic material 7 in the internal cavity S1. The other end of the elastic material 7 abuts against the tip end side surface of the second thrust bearing 82 in a pressing manner, and the second thrust bearing 82 is pressed against the base end 21 of the cylindrical body 2 by the elastic material 7.

[0021] When using the sheet material drilling tool 1 of this embodiment to form a through hole for passing a protrusion through sheet material such as a waterproof sheet, for example, as shown in Figure 2, the waterproof sheet 14 is laid on the bolt portion 13 side of the welding base 11, which is composed of a fixed base 12 and a bolt portion 13 protruding from one side of the fixed base 12, so that it protrudes in a generally mountain-like shape at a location corresponding to the bolt portion 13, and the ring blade 4 of the sheet material drilling tool 1, which has an electric rotary tool 10 connected to its engagement connecting portion 3, is positioned at a position corresponding to the outer periphery of the periphery of the bolt portion 13, with the waterproof sheet 14 sandwiched between them, and abuts against the waterproof sheet 14. In this state, the axis of the shaft portion 62 of the positioning core member 6 is positioned so that it approximately coincides with the axis of the bolt portion 13.

[0022] Then, a power rotary tool 10 such as an impact driver applies a rotational force and an impact force to the sheet material drilling tool 1, and the ring blade 4 cuts the waterproof sheet 14 to form a through hole 141 for passing a bolt portion 13 corresponding to the protrusion. When a rotational force is applied to the cylindrical body 2 and ring blade 4 of the sheet material drilling tool 1 by the power rotary tool 10, the first thrust bearing 81 and the second thrust bearing 82 prevent the rotational force from being transmitted to the positioning core material 6 and the elastic material 7.

[0023] The bolt portion 13 directly contacts the tip of the shaft portion 62 of the positioning core 6 at the same time as the through hole 141 is formed, and the positioning core 6 is pushed into the internal cavity S1 against the biasing force of the elastic material 7 toward the tip side, while the bolt portion 13 itself is inserted into the external cavity S2. At this time, the length by which the positioning core 6 can be pushed toward the base end, in other words, the length by which the positioning core 6 can be pushed into the internal cavity S1, is formed to be smaller than the protruding length of the specified bolt portion 13, which is a specified protrusion inserted into the tip side of the partition wall 5 of the cylindrical body 2, i.e., the external cavity S2, thereby preventing the ring blade 4 from contacting the fixed base 12 of the welding base 11.

[0024] 3 shows an example of a structure having a waterproof sheet 14 constructed using the sheet material drilling tool 1 of the embodiment, in which, during tunnel excavation, the waterproof sheet 14 is laid on the inner periphery of supports 101 erected at predetermined intervals on the inner periphery of the natural ground and shotcrete 102 sprayed around the supports 101. A fixed base 12 of a welding pedestal 11 is fixed to the inner periphery of the support 101 by welding, and the waterproof sheet 14 is laid so that a bolt portion 13 protruding from one side of the fixed base 12 passes through a through hole 141.

[0025] In this example, a buffer layer 103 such as a nonwoven fabric is laid between the waterproof sheet 14 and the shotcrete 102. Furthermore, a sealing material 104 such as a rubber packing and a washer 105 are inserted in this order onto the bolt portion 13 on the inner periphery of the waterproof sheet 14 in the tunnel space, and a long nut 106 is screwed onto the bolt portion 13 so as to press the sealing material 104 and washer 105 onto the waterproof sheet 14. A retaining bolt 107 is screwed onto the inner periphery of the long nut 106 in the tunnel space so as to protrude from the long nut 106, and the retaining bolt 107 holds structural reinforcement 108 in the lining concrete that is poured inside the shotcrete 102.

[0026] With the sheet material hole drilling tool 1 of this embodiment, centering is performed by abutting the positioning core member 6 against a protrusion such as the bolt portion 13 via the sheet material, and then centering is performed by pressing the positioning core member 6 toward the tip end, and while maintaining the positioned state, it is possible to form a through hole 141 or the like that passes through the protrusion in the sheet material with the ring blade 4. Therefore, when forming a through hole that passes through the protrusion in the sheet material, a clean through hole can be easily formed.

[0027] Furthermore, by making the length that can be pushed toward the base end of the positioning core material 6 shorter than the protruding length of the specified protrusion inserted into the tip side of the partition 5 of the cylindrical body 2, when the specified protrusion is inserted into the tip side of the partition 5 of the cylindrical body 2 to drill a hole in the sheet material, it is possible to prevent the ring blade 4 from coming into contact with the protruding surface of the fixed base 12 of the welding base 11, etc., and to prevent damage to the ring blade 4.

[0028] In addition, the first thrust bearing 81 prevents the rotational force of the electric rotary tool 10 from being transmitted to the positioning core 6, thereby preventing misalignment of the positioning core 6. This allows for more precise and reliable formation of through holes in the sheet material for passing protrusions through. Furthermore, the second thrust bearing 82 prevents the rotational force of the electric rotary tool 10 from being transmitted to the elastic material 7 and the positioning core 6, thereby more reliably preventing misalignment of the positioning core 6.

[0029] Furthermore, by forming the opening window 24, it is possible to visually confirm how far the ring blade 4 has penetrated relative to the protrusion during drilling, thereby more reliably drilling the desired hole in the sheet material. Furthermore, because it is possible to visually confirm how far the ring blade 4 has penetrated relative to the protrusion, even when drilling a hole to penetrate a protrusion other than a specified protrusion, such as the bolt portion 13, it is possible to visually confirm and prevent the ring blade 4 of the sheet material drilling tool 1 from coming into contact with the protruding surface of a protrusion, such as the fixed base 12 of the welding base 11, thereby preventing damage to the ring blade 4.

[0030] [Scope of the invention disclosed herein] The inventions disclosed in this specification include, in addition to the individual inventions and embodiments listed as inventions, those specified by changing partial contents of these to other contents disclosed in this specification, those specified by adding other contents disclosed in this specification to these contents, or those specified by deleting partial contents of these to the extent that partial effects are obtained and creating a generic concept.The inventions disclosed in this specification also include the following contents and modifications.

[0031] For example, the sheet material in which a through hole is formed by the sheet material drilling tool of the present invention is preferably a soft sheet such as waterproof sheet 14, but other materials may be used as appropriate within the applicable range. Furthermore, the protrusions targeted by the sheet material drilling tool of the present invention may be used as appropriate within the applicable range, and are not limited to bolt portion 13 in the above embodiment.

[0032] Furthermore, although the elastic material in the sheet material drilling tool of the present invention is preferably a compression coil spring, any suitable elastic material can be used. Furthermore, although the sheet material drilling tool of the present invention is preferably provided with a first thrust bearing mounted on the base end side of the head of the positioning core member in the cylindrical body, and a second thrust bearing mounted on the base end side of the elastic material in the cylindrical body, it is also possible to provide either one of the first thrust bearing and the second thrust bearing, or to provide neither the first thrust bearing nor the second thrust bearing, for example, by providing only an elastic material such as a compression coil spring in the internal cavity S1.

[0033] Furthermore, the ring blade 4 provided at the tip of the cylindrical body 2 is not limited to the example shown in the figure, and for example, the ring-shaped cutting edge may be serrated depending on the material of the sheet material to be punched, and further, the peripheral surface of the cutting edge may be tapered so as to be inclined relative to the axis.

[0034] Furthermore, the cylindrical body 2 illustrated in the embodiment has a tip portion consisting of the partition wall 5, tip side peripheral wall 23, and ring blade 4, and a base portion consisting of the base end portion 21 and base side peripheral wall 22, which are formed by integrating the tip surface of the base side peripheral wall 22 with the partition wall 5 by friction welding.However, the configuration and manufacturing method of the sheet material drilling tool of the present invention are not limited to this, and the base side peripheral wall 22 and the partition wall 5 may be assembled together by a screw connection in the opposite direction to the forward rotation direction of the electric rotary tool 10, and may be configured so that they can be replaced in the event of a component malfunction. [Industrial Applicability]

[0035] The present invention can be used when drilling holes using an electric rotary tool in sheet material such as a waterproof sheet laid inside a tunnel, for example. [Explanation of symbols]

[0036] DESCRIPTION OF SYMBOLS 1...Sheet material drilling tool 2...Cylinder 21...Base end portion 22...Base end peripheral wall 23...Tip end peripheral wall 24...Opening window 3...Engaging connecting portion 4...Ring blade 5...Bulkhead 51...Through hole 6...Positioning core material 61...Head portion 62...Shaft portion 7...Elastic material 81...First thrust bearing 82...Second thrust bearing S1...Inner cavity S2...External cavity 10...Electric rotary tool 11...Welding base 12...Fixed base 13...Bolt portion 14...Waterproof sheet 141...Through hole 101...Support 102...Sprayed concrete 103...Buffer layer 104...Sealing material 105...Washer 106...Long nut 107...Retaining bolt 108...Structural reinforcement 201...Support 202...Sprayed concrete 203...Welding base 204...Fixed base 205...Bolt part 206...Waterproof sheet 207...Through hole 208...Bur 209...Hammer W...Leak

Claims

1. A sheet material punching tool for forming a through hole for passing a protrusion through a sheet material, A substantially cylindrical body with a bottom, an engaging and connecting portion formed to protrude from the base end side of the cylindrical body and adapted to detachably engage and connect to an electric rotary tool; a ring blade provided at the tip of the cylindrical body; a partition wall provided at an axially intermediate position of the cylindrical body; a substantially nail-shaped positioning core member having a shaft portion inserted into a through hole formed in the center of the partition wall and a head portion disposed on a base end side of the partition wall; an elastic member that presses and biases the positioning core member toward the tip end, A sheet material punching tool, characterized in that an opening window is formed on the tip side of the partition wall of the cylindrical body.

2. A sheet material punching tool as described in claim 1, characterized in that the length that can be pushed into the base end of the positioning core material is smaller than the protruding length of the specified protrusion inserted into the tip side of the partition of the cylindrical body.

3. A sheet material drilling tool as described in claim 1 or 2, characterized in that a thrust bearing is installed inside the base end side of the head of the positioning core material in the cylindrical body, and the positioning core material is pressed toward the tip side by the elastic material via the thrust bearing.

4. 4. The sheet material drilling tool according to claim 3, wherein another thrust bearing is provided inside the cylindrical body on the base end side of the elastic material.

Images