JP5896798B2 - ALC board base coating film cutting blade, ALC board fastener provided therewith, and ALC board fastening method - Google Patents

Description

  The present invention is an ALC board that is used when an ALC (lightweight cellular concrete) board whose surface has been pre-coated on the surface is fastened to a woody part such as a building frame using a self-drilling screw (a male screw that self-spins). This invention relates to a cutting tool for a base coating film, a fastener for an ALC board provided with the cutting tool, and a method for fastening the ALC board.

  ALC boards are frequently used as heat insulating materials and building materials. Also in general wooden construction, it is used as a heat insulating material as an outer wall material. For example, as shown in Patent Documents 1 and 2, the internal thread is formed by tapping by itself. A self-drilling screw is used to attach to the woody part of the building frame. Here, since the position of the column on which the ALC board is to be fixed with the self-piercing screw varies depending on the construction site, a hole for fixing the board to the ALC board cannot be made in advance. Further, when fixing the ALC board, for aesthetic reasons, the fixing self-drilling screw is tightened until it sinks, that is, until its head completely sinks into the ALC board. After the tightening operation is completed, fill the hole that has been sunk with a putty etc. to make the traces of the hole invisible, and then apply a base coat for waterproofing (if the base is not already applied to the ALC board as described below) ) In addition, the final appearance paint is given.

  However, since the ALC board is set up vertically and fixed at the construction site, if the waterproof base coating is applied after fixing at the site, there may be dripping of the paint, and even an expert can ensure a uniform coating surface. It is difficult to secure the lifetime of the building.

  Therefore, at present, a product obtained by applying a waterproof base coating to the surface of the ALC board in advance at the stage of the production factory has been produced (for example, see Non-Patent Document 1). With such an ALC board, a stable high-quality base coating is ensured by painting at the factory.

Japanese Patent Laid-Open No. 10-37925 Japanese Patent No. 2880986

Catalog “Hebel Power Board”, Asahi Kasei Building Materials Co., Ltd., February 2012, p. 60-63

  FIG. 1 shows an example of a conventional fastening structure of an ALC board 2 using an ALC board 2 having a waterproof base coating 1 applied in advance to the surface at the factory stage as described above. In this conventional example, the ALC board 2 is sandwiched by a self-drilling screw 6 on a stud (frame) 5 made of a wood material, with a ventilation trunk edge 3 and a wall base plate 4 made of wood material sandwiched therebetween. It is concluded. Moreover, the figure is a horizontal cross section, the self-drilling screw 6 is screwed in the horizontal direction, and the ALC board 2 is fixed in the vertical direction.

  Since the waterproof base paint has adhesiveness, conventionally, when the ALC board 2 is fixed with the self-piercing screw 6, the head 7 of the self-piercing screw 6 pulls in the screwing direction while rubbing the base coating film 1, so that the head After the sinking of 7 and the fastening by the self-drilling screw 6 is finished, the base coating film 1 around the hole 8 formed by passing the head 7 of the self-drilling screw 6 is shown in FIG. 1a. On the other hand, since the surface of the painted ALC board 2 is rolled up and the aesthetic appearance is remarkably impaired, a great amount of labor is required for the repair.

  The present invention has been made in view of such a conventional situation, and one of the objects of the present invention is to prevent or reduce the squeezing of the base coating film after completion of the fastening of the base coated ALC board. An object of the present invention is to provide an ALC board base coating film cutting blade, an ALC board fastener provided with the ALC board, and a fastening method of the ALC board, which can reduce the burden of drooping repair work.

  Still other objects of the present invention will become apparent from the following description.

The cutting tool for the base coating film of the ALC board according to the present invention is:
Used for fastening structure in which ALC board with surface coating already applied is fastened to wood using self-drilling screw that is self-drilled, and the head of self-drilled screw is submerged in ALC board. A coating board cutting tool for an ALC board,
The self-drilling screw is inserted so as to allow relative rotation of the self-drilling screw, but has a screw insertion hole having a size that does not allow passage of the head, and a blade provided on the outer periphery. Become
The self-drilling screw is inserted into the screw insertion hole, and when the self-drilling screw is screwed into the wood part through the ALC board, it is pressed by the head of the self-drilling screw while being vibrated in the axial direction. Thus, after the base coating film is cut out with the blade, the ALC board enters the ALC board while breaking the bubbles of the ALC board.

Moreover, the ALC board fastener of the ALC board according to the present invention is:
Used for fastening structure in which ALC board with surface coating already applied is fastened to wood using self-drilling screw that is self-drilled, and the head of self-drilled screw is submerged in ALC board. A fastener for an ALC board,
The self-drilling screw and the base coating film cutting blade,
The self-drilling screw has a shaft portion, the head portion provided at the rear end portion of the shaft portion, and a male screw portion formed at a tip side portion of the shaft portion,
The base coating film cutting blade has a screw insertion hole and a blade provided on the outer periphery,
The base coating film cutting blade is relative to the self-drilling screw without the possibility of falling off from the self-drilled screw in a state where a portion other than the male screw part of the self-drilled screw is inserted into the screw insertion hole. It is mounted so as to be rotatable and movable in the axial direction between the head and the male screw part, and when the self-drilling screw is screwed into the wood part through the ALC board, it vibrates in the axial direction. The base coating film is cut by the blade by being pressed by the head of the self-drilling screw, and then penetrates into the ALC board while destroying the bubbles of the ALC board. It is.

Furthermore, the fastening method of the ALC board according to the present invention includes:
Preparing an ALC board whose surface is already coated with a base coat;
A step of preparing a self-drilling screw having a shaft portion, a head portion provided at a rear end portion of the shaft portion, and a male screw portion formed on the shaft portion, and self-screwing;
The self-drilling screw is inserted so as to allow relative rotation of the self-drilling screw, but has a screw insertion hole having a size that does not allow passage of the head, and a blade provided on the outer periphery. Preparing a base coating film cutting blade to be,
With the self-drilling screw inserted into the screw insertion hole, the self-drilled screw is screwed into the wood part through the ALC board, and the base coating film cutting blade is applied to the head while applying vibration in the axial direction. After pressing the ALC board and cutting out the base coating film with the blade of the base coating film cutting blade, the base coating film cutting blade is allowed to enter the ALC board while destroying bubbles in the ALC board. Sinking the head into the ALC board.

  In the present invention, the self-drilling screw is screwed into the wood part through the ALC board while the self-drilling screw is inserted into the screw insertion hole of the base coating film cutting blade, and the head of the self-drilled screw is given vibration in the axial direction. After the base coating film cutting blade is pressed against the ALC board, the base coating film is cut out with the blade of the base coating film cutting blade, and then the base coating film cutting blade is broken inside the ALC board while breaking the bubbles on the ALC board. And the head is sunk into the ALC board.

  Here, since the base coating film cutting blade is rotatable with respect to the shaft portion, it does not rotate with the self-drilling screw, so when cutting the base coating film as described above, while rubbing the base coating film Since it does not rotate and moves only in the axial direction and cuts out, the occurrence of burr of the coating film is reduced, and therefore, the rising of the base coating film from the surface of the ALC board after fastening is prevented or reduced. it can.

  According to the present invention, it is possible to prevent or reduce the occurrence of curling of the ground coating film that occurs after completion of the screw fastening operation in the mounting work of the ground coated ALC board, and to reduce the burden of repair work of the paint curling. .

It is sectional drawing which shows the state of the base coating film after completion | finish of the fastening of the conventional ALC board with base coating. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing a base coating film cutting blade of the present invention in Example 1. It is a top view which shows the said base coating film cutting blade. It is a bottom view which shows the said base coating film cutting blade. It is sectional drawing in the VV line | wire of FIG. It is a front view which shows the ALC board fastener in Example 1. FIG. It is a top view which shows the head of the self-drilling screw of the said fastener for ALC boards. FIG. 7 is an enlarged cross-sectional view showing the vicinity of the retaining ring and the base coating film cutting blade of FIG. 6. In the ALC board mounting operation of Example 1, it is sectional drawing which shows the state just before a base coating film cutting blade starts the cutting | disconnection of a base coating film. It is an expanded sectional view which shows the principal part of FIG. FIG. 5 is a cross-sectional view showing a state where the undercoating film cutting blade has further penetrated into the ALC board after cutting the undercoating film in the ALC board attaching operation of Example 1. In the ALC board attachment work of Example 1, the self-drilling screw is further screwed in, and the outer periphery of the head of the self-drilling screw shows a state where the surrounding base coating film is bald. It is sectional drawing which shows the state which the self-drilling screw sinks to predetermined depth in the ALC board attachment operation | work of Example 1. FIG. It is sectional drawing which shows the state which filled the putty in the hole produced by the sinking of a self-drilling screw in the ALC board attachment operation | work of Example 1. FIG. FIG. 5 is a cross-sectional view showing a state in which cutting of the base coating film with the base coating film cutting blade is incomplete and burrs of the coating film are generated in the ALC board mounting operation of Example 1. It is an expanded sectional view which shows the principal part of the fastener for ALC boards of this invention in Example 2. FIG. It is sectional drawing which shows the state immediately before the base coating film cutting blade in Example 2 starts the cutting | disconnection of a base coating film. 6 is a plan view showing a base coating film cutting blade of the present invention in Example 3. FIG. It is a front view which shows the base coating film cutting blade of this invention in Example 3. FIG. It is sectional drawing in the XX-XX line of FIG. 6 is a front view showing an ALC board fastener in Example 3. FIG. In the ALC board mounting operation of Example 3, it is sectional drawing which shows the state just before a base coating film cutting blade starts the cutting | disconnection of a base coating film. In the ALC board attachment work of Example 3, it is sectional drawing which shows the state in which the self-drilling screw was further screwed in and the outer periphery of the head part of the self-drilled screw bald the base coating film. In the ALC board attachment work of Example 3, it is sectional drawing which shows the state by which the self-drilling screw was sunk to the predetermined depth. It is a front view which shows the head of the self-drilling screw part of the fastener for ALC boards in Example 4. FIG. It is sectional drawing in the XXVI-XXVI line of FIG. It is sectional drawing similar to FIG. 25, Comprising: It is a figure which shows the seat surface of the head of the self-drilling screw part of the fastener for ALC boards in Example 5. FIG.

  Hereinafter, the present invention will be described based on embodiments shown in the drawings.

  2 to 15 show Example 1 of the present invention. Of these, FIGS. 2 to 5 show a base coating film cutting blade 10 according to the present embodiment. The cutting blade 10 is made of a metal such as stainless steel or steel, and has an annular and plate-shaped main body 11 and the main body. 11 is integrally provided with a screw insertion hole 12 provided in the center of 11 and a plurality of sawtooth-shaped blades 13 projecting from the outer periphery of the main body 11 in one axial direction.

  6 to 8 show an ALC board fastener 14 in this embodiment, which has a self-drilling screw 6, a retaining ring 15, and the base coating film cutting blade 10. The self-drilling screw 6 is made of a metal such as stainless steel or steel, and has a shaft portion 16, a head 7 provided at the rear end portion of the shaft portion 16, and a screw on a tip side portion of the shaft portion 16. It has the external thread part 17 formed by the rolling process integrally. The head 7 has a dish shape and is provided with a square drive hole 18. On the outer periphery of the top of the head 7, a sawtooth-like unevenness 19 is provided. The outer diameter A of the head 7 of the self-piercing screw 6 is larger than the outer diameter B of the base coating film cutting blade 10.

  A portion of the shaft portion 16 where the male screw portion 17 on the head 7 side is not provided is inserted through the retaining ring 15 and the screw insertion hole 12 of the base coating film cutting blade 10. Then, the base coating film cutting blade 10 is inserted between the retaining ring 15 and the head 7, and the blade 13 is directed to the tip side of the self-piercing screw 6. The outer diameter of the retaining ring 15 is smaller than the outer diameter of the cutting blade 10, while the inner diameter of the retaining ring 15 is the portion of the shaft portion 16 on the head 7 side where the male screw portion 17 is not provided. It is larger than the diameter and smaller than the outer diameter of the male screw portion 17. Further, the inner diameter of the base coating film cutting blade 10 (the diameter of the screw insertion hole 12) is smaller than the outer diameter of the retaining ring 15. Therefore, the retaining ring 15 and the base coating film cutting blade 10 can be rotated with respect to the self-drilling screw 6 without the possibility of falling off the self-drilling screw 6 and the head 7 and the male screw part 17. It is mounted so as to be movable in the axial direction. Note that such a mounting configuration is obtained by, for example, fitting the material of the self-piercing screw 6 to the retaining ring 15 and the base coating film cutting blade 10 before rolling the male screw portion 17, and thereafter It can be obtained by rolling the male screw portion 17. This is because the outer diameter of the male screw portion 17 becomes larger than the diameter of the material by rolling.

  Next, with reference to FIGS. 9-15, the attachment process of the ALC board 2 by which the base coating was carried out in a present Example is demonstrated. In the present embodiment, as in the above-described conventional example, the ALC board 2 is sandwiched between the wooden pillars 5 made of wood material, and the wall base plate 4 made of wood material and the ventilating trunk edge 3 are sandwiched therebetween. In the state, it is fastened by the self-drilling screw 6 (however, in the present invention, the elements interposed between the ALC board and the casing may not be the same as those in this embodiment, or between the ALC board and the casing. There is no need to intervene anything, and the frame is not limited to the studs).

  The self-drilling screw 6 of the ALC board fastener 14 is screwed into the ventilating trunk edge 3, the wall base plate 4 and the stud 5 through the ALC board 2 using an impact driver (not shown). The impact driver is an electric driver having a function of hitting in the rotational direction. However, since the self-drilling screw 6 has a spiral male screw portion 17, vibrations are generated not only in the rotational direction but also in the axial direction. Can do.

  When the self-drilling screw 6 is screwed in, the retaining ring 15 and the base coating film cutting blade 10 come into contact with the head 7 of the self-drilling screw 6 as shown in FIGS. The screw 6 cannot move in the axial direction. Further, when the self-drilling screw 6 is screwed in, the blade 13 on the outer periphery of the base coating film cutting blade 10 cuts the base coating film 1 into a circle as shown in FIG. 11 (in order to prevent the drawing from becoming complicated). The base coating film 1 cut out is not shown). Here, since the base coating film cutting blade 10 is rotatable relative to the shaft portion 16, it does not rotate with the self-drilling screw 6. Since it does not rotate while rubbing 1 and moves and cuts only in the axial direction, the occurrence of burrs of the coating film 1 is reduced, and therefore the foundation coating film 1 swells from the surface of the ALC board 2 after the fastening is completed. Can be prevented or reduced.

  In addition, since the base coating film cutting blade 10 does not rotate with the self-drilling screw 6 as described above, even if a clamping pressure is applied from the head 7 of the self-drilling screw 6, the ALC board 2 rotates. I will not scrape off. However, in this embodiment, the fastening operation is performed while applying an axial vibration by the impact driver. Therefore, after the base coating film cutting blade 10 vibrates in the axial direction, the base coating film 1 is cut off as described above. The air bubbles in the ALC board 2 are destroyed and the ALC board 2 is dug while the ALC is made into a fine concrete powder.

  Further, since the retaining ring 15 does not rotate together with the self-drilling screw 6, it does not rotate and scrape off the ALC board 2, but when the vibration is applied in the axial direction, bubbles in the ALC board 2 are removed. Destroy and dig up ALC board 2 while making ALC a fine concrete powder. However, since the blade 13 is not provided on the retaining ring 15, the base coating film 1 cannot be cut cleanly. However, since it exists inside the blade 13 of the base coating film cutting blade 10, there is a particular problem. It does not occur.

  Further, when the base coating film 1 is not sufficiently dried and flexible, as shown in FIG. 15, the base coating film 1 is not cut cleanly by the base coating film cutting blade 10, and a burr 1b is generated. However, in this embodiment, the outer diameter A of the head 7 of the self-drilling screw 6 is larger than the outer diameter B of the base coating film cutting blade 10, and the outer periphery of the top of the head 7 is Since the serrated irregularities 19 are provided, even in such a case, in the process where the self-drilling screw 6 is further screwed in, the punching burr 1b is scraped off at the outer periphery of the top of the head 7 as shown in FIG. Can do. In addition, in this embodiment, the head 7 has a dish shape, and a distance can be provided between the base coating film cutting blade 10 and the top of the head 7, so that the dry coating film is stretched. Even if it is difficult to cut, the burr 1b can be scraped off more satisfactorily because the coating film is sufficiently stretched and can be scraped off at the outer periphery of the top portion of the head 7.

  FIG. 13 shows a state where the self-drilling screw 6 is sunk to a predetermined depth and the fastening operation is completed. When the fastening operation is completed as described above, after filling the putty 20 into the hole 8 caused by the sinking of the self-drilling screw 6 as shown in FIG. Do.

  Conventionally, since the ALC board 2 is cut by the rotation of the head 7 of the self-drilling screw 6, the head 7 is viewed in the axial direction like the self-drilling screw 6 described in Patent Documents 1 and 2. As a square or hexagon, it was necessary to discharge the chips of the ALC board 2 from the opposite sides (straight lines) of these squares or hexagons. However, in the present invention, the ALC bubbles are generated by vibration and pressure as described above. Since the ALC is made into a fine powder and the volume is remarkably reduced, even if the shape of the head 7 of the self-drilling screw 6 is circular when viewed in the axial direction, the fine ALC powder is self-drilled screw 6. Is discharged from the bottom of the hole 8 as the head 7 rotates. Therefore, the shape of the head 7 of the self-drilling screw 6 does not have to be particularly a quadrangle or a hexagon, and can be freely selected.

  16 and 17 show Example 2 of the present invention. In this embodiment, the ALC board fastener 14 does not have the retaining ring 15, and only the base coating film cutting blade 10 is attached to the self-piercing screw 6. The inner diameter of the base coating film cutting blade 10 (the diameter of the screw insertion hole 12) is larger than the diameter of the portion of the shaft portion 16 on the head 7 side where the male screw portion 17 is not provided, and the outer diameter of the male screw portion 17. Have been smaller. Accordingly, also in this embodiment, the base coating film cutting blade 10 can be rotated with respect to the self-drilling screw 6 without the possibility of falling off the self-drilling screw 6 and the head 7 and the male screw part 17. It is mounted so as to be movable in the axial direction. Note that the mounting structure of this embodiment also has a configuration in which, for example, the material of the self-drilling screw 6 is fitted to the base coating film cutting blade 10 before the male threaded portion 17 is rolled, and then the male threaded thread is threaded. It can be obtained by rolling the part 17. Other configurations are the same as those of the first embodiment.

  Also in this embodiment, the same effect as that of the first embodiment can be obtained. In this embodiment, the retaining ring 15 is not required as in the first embodiment. However, since the diameter of the screw insertion hole 12 of the base coating film cutting blade 10 cannot be increased, the position where the base coating film cutting blade 10 contacts the dish-shaped head 7 as shown in FIG. The position is farther from the top of the head 7 than the case.

  18 to 24 show a third embodiment of the present invention. Among these, FIGS. 18 to 20 show a base coating film cutting blade 10 in the present embodiment, and this blade 10 is made of a metal such as stainless steel or steel, and has an annular and plate-like main body portion 11 and the main body portion 11. The screw insertion hole 12 provided in the central portion of the main body 12 and the blades 13 protruding outward from the outer periphery of the main body 12 and plastic torsional deformation are integrally formed with the blades 13 protruding on both sides in the axial direction. Have.

  FIG. 21 shows the ALC board fastener 14 in the present embodiment, and the base coating film cutting blade 10 is attached to the self-drilling screw 6. The self-drilling screw 6 is made of a metal such as stainless steel or steel, and is transferred to a shaft portion 16, a head portion 7 provided at the rear end portion of the shaft portion 16, and a tip side portion of the shaft portion 16. It has the external thread part 17 formed by the manufacturing process integrally. The head 7 is a pan head and is provided with a cross hole drive hole 18. The outer diameter A of the head 7 of the self-piercing screw 6 is larger than the outer diameter B of the base coating film cutting blade 10.

  A portion of the shaft portion 16 where the male screw portion 17 on the head 7 side is not provided is inserted into the screw insertion hole 12 of the base coating film cutting blade 10. The inner coating film cutting blade 10 has an inner diameter (diameter of the screw insertion hole 12) larger than the diameter of the portion of the shaft portion 16 on the head 7 side where the male screw portion 17 is not provided, and is outside the male screw portion 17. It is smaller than the diameter. Thereby, also in the present embodiment, the base coating film cutting blade 10 can be rotated with respect to the self-drilling screw 6 and can be rotated with respect to the self-drilled screw 6 without causing the self-drilled screw 6 to fall off. 17 is mounted so as to be movable in the axial direction.

  Also in this embodiment, as shown in FIGS. 22 to 24, when the self-drilling screw 6 is screwed in, the blade 13 on the outer periphery of the base coating film cutting blade 10 becomes the base coating film as in the case of the first embodiment. Cut 1 into a nearly circular shape. Further, the base coating film cutting blade 10 vibrates in the axial direction, thereby cutting off the base coating film 1 as described above, destroying bubbles in the ALC board 2, and making the ALC into a fine concrete powder. Go digging 2 and go. Thereby, basically, the same operational effects as those of the first and second embodiments can be obtained.

  However, in the case of the present embodiment, the head 7 of the self-drilling screw 6 is a pan head (the same applies to the case of a flat head). Therefore, in order to enable a high tightening torque, as in Embodiments 1 and 2. If the drive hole 18 is made to be a square hole, the height of the head 7 must be increased, the amount of material used is very large, the material cost is high, and it cannot be manufactured with a normal screw forging machine. Therefore, it is necessary to manufacture with an expensive screw forging machine. In this embodiment, in order to avoid such an increase in cost, the drive hole 18 is a cross hole, which is disadvantageous in terms of obtaining a high tightening torque.

  Also in this embodiment, since the outer diameter A of the head 7 of the self-drilling screw 6 is larger than the outer diameter B of the base coating film cutting blade 10, the base coating film 1 is not sufficiently dried and is flexible. Even if the base coating film 1 is not cut off neatly by the base coating film cutting blade 10 and the removal burr is generated, the removal burr can be burned off at the outer periphery of the top of the head 7 as shown in FIG. it can. However, in this embodiment, since the unevenness 19 is not provided on the outer periphery of the head 7, the performance of removing burr on the outer periphery of the head 7 is higher than the case where the unevenness 19 is provided as in Examples 1 and 2. descend. However, of course, when the head 7 is a pan head or a flat head as in the present embodiment, the unevenness 19 may be provided on the outer periphery of the head 7 as in the first embodiment.

  Further, in this embodiment, since the blade 13 protrudes on both sides in the axial direction of the base coating film cutting blade 10, either surface may be directed to the tip side of the self-piercing screw 6. There is an advantage that there is no need to worry about the direction of the front and back when the coating film cutting blade 10 is mounted.

  However, even in the case of a self-drilling screw having the head 7 as a pan head or a flat head as in the present embodiment, the base coating film cutting blade 10 having a configuration in which the blade 13 projects only on one side in the axial direction as in the first embodiment. And may be combined.

  Of course, the base coating film cutting blade 10 in which the blade 13 protrudes on both sides in the axial direction as in the present embodiment is used in combination with the countersunk self-drilling screw 6 and the retaining ring 15 in the first and second embodiments. May be.

  25 and 26 show Example 4 of the present invention. In the present embodiment, a plurality of linear protrusions 21 are provided radially on the seating surface of the head 7 of the self-drilling screw 6. Other configurations are the same as those of the third embodiment.

  In this embodiment, even if an electric screwdriver that generates only rotational force is used without using an impact screwdriver, the projection 21 on the seating surface of the head 7 and the surface on the head 7 side of the base coating film cutting blade 10 are used. Since the base coating film cutting blade 10 vibrates in the axial direction by repeatedly colliding with the protruding portion of the blade 13, the same result as that obtained when an impact driver is used can be obtained.

  Of course, if an impact driver is used, workability can be further improved.

  FIG. 27 shows Embodiment 5 of the present invention. In this embodiment, the protrusions 21 arranged radially on the seating surface of the head 7 of the self-drilling screw 6 are in the form of dots. Other configurations are the same as those of the fourth embodiment. Also in this embodiment, the same effect as that of the fourth embodiment can be obtained.

  In each of the above embodiments, an impact driver is used as a driver that generates vibration in the axial direction. However, a vibration drill, a hammer drill, or the like can be used as a driver that generates vibration in the axial direction. is there.

  Further, in each of the above embodiments, the ALC board fastener 14 mounted in advance so as to prevent the base coating film cutting blade 10 from falling off the self-drilling screw 6 is used. The base coating film cutting blade and the self-drilling screw may be used in combination for the first time during the mounting operation. However, if the ALC board fastener 14 in which the base coating film cutting blade 10 is mounted in advance on the self-drilling screw 6 as in the above-described embodiments, the operation becomes easier.

  Further, in each of the above embodiments, the outer diameter A of the head 7 of the self-drilling screw 6 is made larger than the outer diameter B of the base coating film cutting blade 10. If the coating film is not cut off cleanly and burr of the base coating film occurs, if you do not consider scuffing with the head of the self-drilling screw, the outer diameter of the head of the self-drilling screw is the base coating film. You may make it small so that it may become the magnitude | size below the outer diameter of a cutting blade.

  As described above, according to the present invention, an ALC board base coating film cutting blade, an ALC board fastener having the cutting tool, and an ALC board fastening method include an ALC board whose surface is previously coated with a self-piercing screw. It is useful for the work to be fastened to a wood part such as a building frame.

1 Undercoating film 2 ALC board 5 Interstitial pillar (frame, wood part)
6 Self-drilling screw 7 Self-drilling screw head 8 Hole 10 Undercoating film cutting blade 11 Main body 12 Screw insertion hole 13 Blade 14 ALC board fastener 15 Retaining ring 16 Self-drilling screw shaft 17 Self-drilling screw Male thread part 19 Concave and convex 21 Protrusion

Claims (11)

Used for fastening structure in which ALC board with surface coating already applied is fastened to wood using self-drilling screw that is self-drilled, and the head of self-drilled screw is submerged in ALC board. A coating board cutting tool for an ALC board,
The self-drilling screw is inserted so as to allow relative rotation of the self-drilling screw, but has a screw insertion hole having a size that does not allow passage of the head, and a blade provided on the outer periphery. Become
The self-drilling screw is inserted into the screw insertion hole, and when the self-drilling screw is screwed into the wood part through the ALC board, it is pressed by the head of the self-drilling screw while being vibrated in the axial direction. Then, after cutting out the base coating film with the blade, the ALC board base coating film cutting blade is adapted to enter the ALC board while destroying bubbles in the ALC board.   The undercoating film cutting blade of an ALC board according to claim 1, which has a blade protruding at least on one side in the axial direction.   The base coating film cutting blade of an ALC board according to claim 2, having blades protruding on both sides in the axial direction.   The ALC board according to claim 3, comprising an annular and plate-like main body portion, and a plurality of blades protruding outward from the outer periphery of the main body portion and protruding to both sides in the axial direction by being plastically deformed. Cutting tool for base coating film. Used for fastening structure in which ALC board with surface coating already applied is fastened to wood using self-drilling screw that is self-drilled, and the head of self-drilled screw is submerged in ALC board. A fastener for an ALC board,
The self-drilling screw and the base coating film cutting blade,
The self-drilling screw has a shaft portion, the head portion provided at the rear end portion of the shaft portion, and a male screw portion formed at a tip side portion of the shaft portion,
The base coating film cutting blade has a screw insertion hole and a blade provided on the outer periphery,
The base coating film cutting blade is relative to the self-drilling screw without the possibility of falling off from the self-drilled screw in a state where a portion other than the male screw part of the self-drilled screw is inserted into the screw insertion hole. It is mounted so as to be rotatable and movable in the axial direction between the head and the male screw part, and when the self-drilling screw is screwed into the wood part through the ALC board, it vibrates in the axial direction. While being pressed by the head of the self-drilling screw, after the base coating film is cut out by the blade, the ALC board enters the ALC board while destroying bubbles in the ALC board. Fastener for board.   The fastener for an ALC board according to claim 5, wherein the outer diameter of the head of the self-drilling screw is larger than the outer diameter of the base coating film cutting blade.   The self-drilling screw has a protrusion on the seating surface of the head, the base coating film cutting blade has a plurality of blades protruding on both sides in the axial direction, and when the self-drilling screw is screwed, the protrusion The fastener for an ALC board according to claim 5 or 6, wherein the blade repeatedly collides with the blade to generate vibration in the axial direction.   The self-drilling screw further includes a retaining ring inserted through a portion of the shaft portion where the male thread portion is not provided, and the outer diameter of the retaining ring is the thread insertion of the base coating film cutting blade. It is larger than the diameter of the hole, the inner diameter of the retaining ring is smaller than the outer diameter of the male screw portion, and the base coating film cutting blade is inserted between the retaining ring and the head of the self-piercing screw. The ALC board fastener according to any one of claims 5 to 7. Preparing an ALC board whose surface is already coated with a base coat;
A step of preparing a self-drilling screw having a shaft portion, a head portion provided at a rear end portion of the shaft portion, and a male screw portion formed on the shaft portion, and self-screwing;
The self-drilling screw is inserted so as to allow relative rotation of the self-drilling screw, but has a screw insertion hole having a size that does not allow passage of the head, and a blade provided on the outer periphery. Preparing a base coating film cutting blade to be,
With the self-drilling screw inserted into the screw insertion hole, the self-drilled screw is screwed into the wood part through the ALC board, and the base coating film cutting blade is applied to the head while applying vibration in the axial direction. After pressing the ALC board and cutting out the base coating film with the blade of the base coating film cutting blade, the base coating film cutting blade is allowed to enter the ALC board while destroying bubbles in the ALC board. A method of fastening the ALC board, comprising: sinking the head into the ALC board.   The method for fastening an ALC board according to claim 9, wherein the self-drilling screw is screwed in using a screwdriver that generates vibration in the axial direction. The self-drilling screw has a protrusion on the seating surface of the head, the base coating film cutting blade has a plurality of blades protruding on both sides in the axial direction, and when the self-drilling screw is screwed, the protrusion The ALC board fastening method according to claim 9, wherein the blade is repeatedly collided with the blade to generate vibration in the axial direction.

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