JP2007177968A - Drilling machine screw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drilling machine screw securing the fixing strength (anchoring strength) of a sandwich panel to a wood bed while preventing the separation of metal skins from the sandwich panel even when fixing the sandwich panel to the wood bed. <P>SOLUTION: The drilling machine screw A is provided for fixing the sandwich panel 4 in which a heat insulating material 3 is filled between the metal skins 1, 2, to a structural material 5. A drilling part 8 is provided at the front end of a shaft part 7 having a thread 11, and a non-threaded portion 10 having no thread is formed on the shaft part 7. A portion on the front side of the non-threaded portion 10 of the shaft part 7 is formed as a first thread portion 6a and a portion on the rear side of the non-threaded portion of the shaft part 7 is formed as a second thread portion 6b. The condition of T1+T2>L1 is satisfied, where T1 is the thickness of the metal skin 1 which contacts the outer face of the structural material 5 when fixing the sandwich panel 4 to the structural material 5, T2 is the thickness of the heat insulating material 3, and L1 is a length from the front end of the drilling part 8 to the rear end of the first thread portion 6a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a drill screw for fixing a sandwich panel to a building structural material.

  2. Description of the Related Art Conventionally, a building outer wall or the like is formed by fixing a sandwich panel formed by filling a heat insulating material between two metal skins to a structural material of a building. In order to fix the sandwich panel to the structural material, a drill screw is used, but among the drill screws, a half screw type in which the screw thread is provided only in a part of the shaft portion is often used (for example, patents) Reference 1).

  FIG. 3 shows an example of a conventional sandwich panel fixing method. In this example, the sandwich panel 4 is formed by filling a heat insulating material 3 such as rock wool between metal shells 1 and 2 such as a galvanized steel plate. The structural member 5 is formed of a box-shaped steel base with a substantially square cross section. The drill screw A is formed of a shaft portion 7 having a thread 11 on the outer periphery, a drill portion 8 provided on the distal end side of the shaft portion 7, and a head portion 9 provided on the rear end side of the shaft portion 7. A part of the shaft portion 7 on which the screw thread 11 is formed is formed as a screw thread portion 6 at a substantially central portion in the longitudinal direction of the shaft portion 7. The position of the screw thread portion 6 varies depending on the thickness of the sandwich panel 4. . Further, the portion other than the threaded portion 6 of the shaft portion 7 is formed as a threadless portion 10 having a flat surface without the threaded portion 11.

  The sandwich panel 4 is fixed to the structural member 5 as follows. First, as shown in FIG. 3A, the sandwich panel 4 is arranged on the structural member 5 so that one outer surface of the sandwich panel 4 is brought into contact with one outer surface of the structural member 5. Next, the drill screw A is driven while rotating from the surface side of the other metal skin 2 of the sandwich panel 4 (the metal skin 2 not in contact with the structural material 5). That is, the drill screw 8 is drilled in the order of the metal skin 2, the heat insulating material 3, the metal skin 1, and the structural material 5 by the drill portion 8 at the tip of the drill screw A, and the drill screw A until the head 9 of the drill screw A contacts the surface of the metal skin 2 A is screwed into the sandwich panel 4 and the structural member 5. And finally, as shown in FIG. 3 (c), the screw thread portion 6 of the drill screw A is passed through the metal shell 1 and the structural material 5 and screwed, and the screw thread portion 6 and the head 9 sandwich the sandwich. By sandwiching the panel 4, the sandwich panel 4 can be fixed to the structural material 5. Further, as shown in FIG. 3B, when the metal shell 1 and the structural material 5 are drilled by the drill portion 8 of the drill screw A, the screw thread portion 6 is positioned at the portion of the heat insulating material 3 of the sandwich panel 4. In addition, the threadless portion 10 is formed in the metal skin 2 portion. Thereby, it is possible to prevent the force generated when drilling the metal skin 1 and the structural material 5 with the drill portion 8 from being applied to the metal skin 2, and to prevent the metal skin 2 from peeling off from the heat insulating material 3. Can do it.

  FIG. 4 shows an example in which a wood substrate (square member) is used as a pillar as the structural member 5. Even in this conventional example, the same procedure as in FIGS. 3A to 3C (FIGS. 3A, 3B, and 3C is replaced with FIGS. 4A, 4B, and 4C). As shown in FIG. 4 (c), the sandwich panel 4 is fixed to the structural member 5 using a half screw type drill screw A as in the case of the steel base. Then, since the strength is slightly inferior to that of the steel frame base, there is a possibility that the fixing strength of the sandwich panel 4 that does not increase the insertion length (the biting length) of the drill screw A may be lowered.

  Therefore, as shown in FIGS. 5A to 5C, the drill screw A used for the wood base is formed with the screw thread portion 6 longer than the drill screw A used for the steel base, In the wood base, the drill screw A is screwed into the structural member 5 deeper than the steel base. 3A, FIG. 3B, and FIG. 3C correspond to FIG. 5A, FIG. 5B, and FIG. 5C, respectively.

However, when the screw thread portion 6 is lengthened, as shown in FIG. 5B, when the metal shell 1 and the structural material 5 are drilled by the drill portion 8 of the drill screw A, the screw thread portion 6 is moved to the sandwich panel 4. Therefore, the force generated when drilling the metal skin 1 and the structural material 5 with the drill portion 8 is applied to the metal skin 2, and the metal skin 2 is peeled off from the heat insulating material 3. There was a problem. When such peeling occurs, there is a risk that the appearance, strength, and heat insulation of the sandwich panel 4 may be reduced.
JP-A-8-61344

  The present invention has been made in view of the above points, and even when a sandwich panel is fixed to a wood substrate, it is possible to prevent peeling of the metal shell of the sandwich panel and to fix the sandwich panel to the wood substrate. An object of the present invention is to provide a drill screw that can ensure strength (clamping strength).

  The invention related to the drill screw A of the present invention is a drill screw A for fixing a sandwich panel 4 formed by filling a heat insulating material 3 between two metal shells 1 and 2 to a structural material 5 of a building. In addition, the drill portion 8 is provided at the tip of the shaft portion 7 having the screw thread 11, and the screw portion 10 having no screw thread is formed on the shaft portion 7. When the sandwich panel 4 is fixed to the structural member 5 by forming the first threaded portion 6a and the rear portion of the shaft portion 7 from the non-threaded portion as the second threaded portion 6b. The condition of T1 + T2> L1 is satisfied, where T1 is the thickness of the metal skin 1 that is in contact with the outer surface, T2 is the thickness of the heat insulating material 3, and L1 is the length from the tip of the drill portion 8 to the rear end of the first threaded portion 6a. It is characterized by satisfying.

  In the present invention, when the length from the tip of the drill portion 8 to the rear end is L2, and the length from the tip of the drill portion 8 to the rear end of the threadless thread portion 10 is L3, L3-L2> T1 + T2. It is preferable to satisfy the following condition.

  In the present invention, when the length from the rear end of the second screw thread portion 6b to the head portion 9 is L4, it is preferable that the condition of L4 <T1 + T2 is satisfied.

  In the present invention, by satisfying the condition of T1 + T2> L1, when the metal skin 1 and the structural material 5 are drilled by the drill portion 8, the screwless portion 10 is positioned at the portion of the metal skin 2 of the sandwich panel 4. For this reason, it is possible to prevent the force generated when the metal skin 1 and the structural material 5 are drilled by the drill portion 8 from being applied to the metal skin 2, and to prevent the metal skin 2 from peeling off from the heat insulating material 3. It is something that can be done. Therefore, it is possible to prevent the sandwich panel 4 from being deteriorated in appearance, strength, and heat insulation. Of course, the length of the screw thread 6 is longer than that of the drill screw used for the steel frame base, so that the insertion length (screwing length) into the structural material 5 can be increased, and the fixing strength of the sandwich panel 4 can be increased. It is possible to secure the fixing strength by reducing the decrease in the thickness.

  When the sandwich panel 4 is fixed to the structural material 5 by satisfying the condition of L3−L2> T1 + T2, the first screw thread portion 6a is screwed with the metal skin 1 on the structural material 5 side of the sandwich panel 4 and The drill screw A can be screwed into the sandwich panel 4 while screwing the second screw thread portion 6b with the metal shell 2 on the opposite side of the sandwich panel 4 to the structural material 5 side, and the drill screw A can be easily screwed.

  Further, by satisfying the condition of L4 <T1 + T2, the second screw thread portion 6b is connected to the metal skin 1 on the structural material 5 side of the sandwich panel 4 in a state where the drill screw A has been driven (inserted) into the sandwich panel 4. The sandwich panel 4 can be fixed to the structural member 5 while being firmly connected to the drill screw A and the sandwich panel 4.

  Hereinafter, the best mode for carrying out the present invention will be described.

  The drill screw A of the present invention is formed of a metal material such as stainless steel, and as shown in FIG. 1, a shaft portion 7 having a thread 11 on the outer periphery and a drill portion provided at the tip of the shaft portion 7. 8 and a head portion 9 provided at the rear end of the shaft portion 7.

  The shaft portion 7 is formed in an elongated rod shape, and the diameter thereof can be set to, for example, 3.5 to 8.0 mm, but is not limited thereto. In addition, a spiral thread (male thread) 11 is formed on the outer periphery of the shaft portion 7, whereby the shaft portion 7 is composed of a screwless portion 10 and two thread portions 6. That is, the first screw thread portion 6a which is a portion having the screw thread 11 formed on the drill portion 8 side (front side) with respect to the screwless screw thread portion 10, and the head 9 side (rear side) with respect to the screwless screw thread portion 10. A second threaded portion 6b which is a portion having a thread 11 formed on the side), and a threadless portion where the thread 11 is not formed and the surface is formed as a flat surface unlike the threaded portion 6. 10 and the shaft part 7 are constituted. The first thread portion 6a and the second thread portion 6b are required to have the same pitch of the thread 11.

  The drill portion 8 is formed with a sharp tip so that the metal skins 1 and 2 and the structural material 5 of the sandwich panel 4 can be perforated, and a guide groove 8 a and a cutting blade 8 b are formed on the peripheral surface of the drill portion 8. Is formed.

  The head portion 9 can be formed in a disk shape having a larger diameter than the shaft portion 7. As the shape of the head 9, various shapes such as a shape of a hexagon head can be adopted. Further, the rear end surface of the head 9 can be provided with an engaging recess that can be engaged with a tightening tool such as a screwdriver.

  The drill screw A of the present invention is for fixing the sandwich panel 4 to a structural material 5 such as a pillar as a wood base. The sandwich panel 4 is formed by filling a heat insulating material 3 between two metal shells 1 and 2. The metal shells 1 and 2 are formed by rolling or bending a metal plate having a thickness of about 0.3 to 1.6 mm. In this case, various metal plates such as a stainless steel plate, a galvanized steel plate, an aluminum zinc alloy plated steel plate, and a coated steel plate can be used as the metal plate. The thickness of the metal skin 1 and the metal skin 2 may be the same or different. Moreover, as a heat insulating material, the thing about 20-120 mm in thickness can be used. In this case, rock wool, glass wool, or the like can be used as the inorganic heat insulating material, and urethane foam, phenol foam, or the like can be used as the resin heat insulating material. The metal shells 1 and 2 and the heat insulating material 3 can be bonded and integrated.

  And when fixing the sandwich panel 4 to the structural material 5 using the drill screw A of this invention, it carries out as follows. First, as shown in FIG. 2A, the sandwich panel 4 is disposed on the structural member 5 such that the surface of one metal skin 1 of the sandwich panel 4 is brought into contact with one outer surface of the structural member 5. Here, when the outer wall is formed by the sandwich panel 4, the sandwich panel 4 is disposed on the outdoor side of the structural material 5. Next, the drill screw A is driven while rotating from the surface side of the other metal skin 2 of the sandwich panel 4 (the metal skin 2 not in contact with the structural material 5). That is, the drill screw 8 is drilled in the order of the metal skin 2, the heat insulating material 3, the metal skin 1, and the structural material 5 by the drill portion 8 at the tip of the drill screw A, and the drill screw A until the head 9 of the drill screw A contacts the surface of the metal skin 2. A is screwed into the sandwich panel 4 and the structural member 5 and is screwed in. Then, as shown in FIG. 2 (c), the screw thread portion 6 of the drill screw A is finally passed through the metal outer skin 1 and the structural material 5 and screwed, and this screw thread portion 6 (first screw thread portion 6a). The sandwich panel 4 can be fixed to the structural member 5 by fastening the sandwich panel 4 with the second screw thread 6b) and the head 9.

  And in the drill screw A of this invention, compared with the drill screw used for a steel frame base | substrate, by forming the thread part 6 (total of the 1st thread part 6a and the 2nd thread part 6b) long, it is to the structural material 5 It can be screwed deeply, and the decrease in the fixing strength of the sandwich panel 4 can be reduced.

  Further, when the metal shell 1 and the structural material 5 are drilled by the drill portion 8 in the middle of being screwed into the sandwich panel 4 and the structural material 5 as described above, as shown in FIG. The unthreaded thread portion 10 provided between the first threaded portion 6 a and the second threaded portion 6 b is formed so as to be positioned in the metal skin 2 portion. Thereby, it is possible to prevent the force generated when drilling the metal skin 1 and the structural material 5 with the drill portion 8 from being applied to the metal skin 2, and to prevent the metal skin 2 from peeling off from the heat insulating material 3. Can do it. Specifically, the thickness of the metal skin 1 on the side of the sandwich panel 4 that contacts the structural material 5 is T1, the thickness of the heat insulating material 3 is T2, and the distance from the tip of the drill portion 8 to the rear end of the first threaded portion 6a. When the length is L1, the drill screw A is formed so as to satisfy the condition of T1 + T2> L1.

  The drill screw A of the present invention has a condition of L3−L2> T1 + T2 when the length of the drill portion 8 is L2 and the length from the tip of the drill portion 8 to the rear end of the screwless portion 10 is L3. It is formed to satisfy. Accordingly, the first screw thread portion 6a is screwed with the metal skin 1 on the structural material 5 side of the sandwich panel 4, and the second screw thread portion 6b is connected to the metal skin on the opposite side to the structural material 5 side of the sandwich panel 4. 2, the drill screw A can be screwed into the sandwich panel 4, and the drill screw A can be easily screwed.

  Furthermore, in the drill screw A of the present invention, when the length from the rear end of the second threaded portion 6b to the head 9 is L4, the drill screw A is formed in the sandwich panel 4 by satisfying the condition of L4 <T1 + T2. In the state where the driving has been completed (the state shown in FIG. 2C), the second threaded portion 6b can be screwed with the metal skin 1 on the structural material 5 side of the sandwich panel 4, and the drill screw A and the sandwich panel 4 The sandwich panel 4 can be fixed to the structural member 5 while being firmly connected to each other. In the present invention, the rear end of the second screw thread portion 6b may be formed up to the rear end portion of the shaft portion 7 (the neck lower portion of the head portion 9). By satisfying each condition, the thread 11 may be formed up to an arbitrary portion between the rear end of the threadless portion 10 and the head 9.

  Specific examples are shown below.

  A sandwich panel 4 having a thickness of 35 mm (thickness T1: 0.5 mm of one metal skin 1, thickness T2 of heat insulating material 3: 34 mm, thickness of the other metal skin 2: 0.5 mm) is a square cross section having a side of 105 mm For example, as the drill screw A, the length of the shaft portion 7 (the length from the tip of the drill portion 8 to the neck of the head portion 9) is 100 to 130 mm. The length L1 from the front end of the part 8 to the rear end of the first thread 6a is 30 to 34 mm, the length L2 from the front end to the rear end of the drill part 8 is 3.0 to 10 mm, from the front end of the drill part 8 The length L3 from the rear end of the second threaded portion 6b to the head 9 is 0 to 30 mm, and T1 + T2> L1, L3-L2>. T1 + T2, L4 <T1 + T2 It can be used for.

It is a front view which shows an example of embodiment of this invention. The usage method is shown, and (a) to (c) are cross-sectional views. An example of a conventional example is shown, and (a) to (c) are cross-sectional views. The other example of a prior art example is shown, (a)-(c) is sectional drawing. The other example of a prior art example is shown, (a)-(c) is sectional drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal skin 2 Metal skin 3 Thermal insulation material 4 Sandwich panel 5 Structural material 6a 1st thread part 6b 2nd thread part 7 Shaft part 8 Drill part 9 Head 10 Non-thread part 11 Thread A Drill screw

Claims (3)

  A drill screw for fixing a sandwich panel formed by filling a heat insulating material between two metal shells to a structural material of a building, wherein a drill portion is provided at the tip of a shaft portion having a thread and a shaft portion Forming a threadless part without a thread on the shaft, and setting the front part of the shaft part unthreaded part as the first threaded part and the rear part of the shaft part unthreaded part as the second screw When the sandwich panel is fixed to the structural material, the thickness of the metal skin to be brought into contact with the outer surface of the structural material is T1, the thickness of the heat insulating material is T2, and from the tip of the drill part to the rear end of the first threaded part A drill screw characterized by satisfying the condition of T1 + T2> L1, where L1 is a length.   2. The drill screw according to claim 1, wherein the length of the drill portion is L <b> 2 and the length from the tip of the drill portion to the rear end of the non-threaded portion is L <b> 3, and satisfies the condition of L <b> 3 − L <b> 2> T <b> 1 + T <b> 2. . 3. The drill screw according to claim 1, wherein the length from the rear end to the head of the second threaded portion is L4, and the condition of L4 <T1 + T2 is satisfied.

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