JP2008095320A - Fixing structure and screw for floor heat insulating material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To keep stable pulling-out strength for a long period without damaging an ALC panel by force in out-of-plane direction even when the force acts on a floor. <P>SOLUTION: This heat insulating material 12 is laid on a floor slab composed of the ALC panel 13 and a floor substrate material 11 is further overlapped on it to fix them by the screw A. When the screw A passes through the floor substrate material 11 and the heat insulating material 12 and is tightened on the ALC panel 13, only a head part 1 of the screw A comes into contact with the floor substrate material 11. The screw A is a tapping screw constituted by continuous head part 1, barrel part 2, and screw thread part 3, the dimension from the head part 1 to a starting point 3a of the screw thread part 3 is larger than thickness of the floor substrate material 11, diameter of a trough 3c of the screw thread part 3 is larger than diameter of the barrel part 2, and diameter of the head part 1 is larger than diameter of a screw thread 3d. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fixing structure capable of stably fixing a heat insulating material to a floor slab made of a lightweight cellular concrete panel, and a screw capable of preferably realizing this fixing structure.

  In steel-framed buildings, including houses, a lightweight slab concrete panel (hereinafter referred to as “ALC panel”) is laid on the beam to form a floor slab. In general, a floor base material is further laid on the upper surface of the material to constitute a heat-insulating floor. There are several ways to fix the insulation and floor base material laid on the upper surface of the floor slab. Among them, using tapping screws developed exclusively for ALC, In many cases, a fixing structure that is fastened to the ALC panel constituting the floor slab is employed.

  A tapping screw dedicated to ALC is composed of a head portion and a screw thread portion that is continuous with the head portion and has a predetermined length. By screwing the tapping screw from the upper surface of the floor base material with a dedicated tool, the screw thread bites into the floor base material, the heat insulating material, and the ALC panel to integrate them.

  On the other hand, Patent Document 1 describes a technique that uses a fixing tool having a screw part and a body part when fixing a surface plate of a wall panel to a frame material, although it is not a floor structure. In this technology, when a wooden surface plate is fixed to a steel frame with screws when constructing a wall panel, the surface plate is roughened and loosened at the peripheral part of the screw, and as a result, rigidity is secured. It solves the problem of becoming impossible.

  In this technique, the length from the head to the threaded portion is made equal to the thickness of the surface plate, and the outer diameter of the body is made larger than the outer diameter of the threaded portion, so that the boundary between the body and the threaded portion is reached. By using the fixing tool in which the step portion is formed, the surface plate can be fixed to the frame member through the surface plate in a state where the body portion is not loosened.

JP-A-10-102634

  As described above, in a floor insulation structure in which a floor base material and a heat insulating material are fixed to an ALC panel using a tapping screw having a thread portion continuous from the head, the thread of the tapping screw bites into the floor base material and the heat insulating material. It is out. For this reason, when plywood or particle board is used as the floor base material, if a force in the out-of-plane direction acts on the floor base material due to a person walking on the floor or moving a load, this force passes through the thread. Therefore, it acts in the axial direction of the tapping screw. And when such a force acts repeatedly over a long period of time, the biting portion of the tapping screw in the ALC panel is damaged, and the pulling-out strength is reduced.

  For example, when a floor finishing material with an elastic material such as sponge attached to the back surface is laid on the top surface of the floor base material, the force acting in the out-of-plane direction can be absorbed by the elastic material and relaxed. It is impossible to completely eliminate the force acting on the tapping screw. As a result, the pulling-out resistance of the tapping screw is lowered for a long period of time.

  The wall panel described in Patent Document 1 has a function as a structural member of a building that bears the in-plane shear deformation resistance, and the action of the fixing tool when an out-of-plane force acts on the surface plate. Is not listed. Moreover, the fixing tool penetrates in a state where the body portion is not loosened with respect to the surface plate. However, since the outer diameter of the body portion of the fixing tool is formed so as to be closer to the outer diameter of the threaded portion, it cannot be configured as a tapping screw, and the outer surface of the body plate is approximately equal to or slightly smaller than the outer diameter of the body portion. A hole is formed, and a fixing tool is inserted into the hole and fastened to the frame member. Therefore, there is a possibility that a problem that the work becomes complicated may occur.

  When an out-of-plane force is applied to the surface material, this force acts as an axial force on the fixture due to contact friction between the surface plate and the body of the fixture, and acts in this axial direction. The compressive force is transmitted to the frame member through a step portion formed at the boundary between the body portion and the screw portion.

  An object of the present invention is to fix a floor heat insulating material capable of maintaining a stable pullout strength over a long period of time without damaging the ALC panel even when an out-of-plane force is applied to the floor, and the floor heat insulating material. It is another object of the present invention to provide a screw having a function as a tapping screw that realizes the fixing structure.

  In order to solve the above-mentioned problems, a floor heat insulating material fixing structure according to the present invention is a floor heat insulating material in which a heat insulating material is laid on a floor slab composed of an ALC panel, and a floor base material is stacked on the upper surface of the heat insulating material and fixed with screws. The screw is fixed to the ALC panel through the floor base material and the heat insulating material, and when the screw is fastened to the ALC panel, the screw is only on the head with respect to the floor base material. Are configured to be in contact with each other.

  Further, the screw according to the present invention is a screw used for the above-described fixing structure of the floor insulation material, and is a tapping screw including a head, a trunk continuous to the head, and a thread ridge continuous to the trunk. Yes, the dimension from the head through the trunk to the starting point of the thread is larger than the thickness of the floor base material, the root diameter of the thread is larger than the diameter of the trunk, and the diameter of the head is screw It is formed larger than the ridge diameter.

  In the floor heat insulating material fixing structure according to the present invention, when the screw is fastened to the ALC panel, only the head of the screw is in contact with the floor base material. Absent. For this reason, even if an out-of-plane force according to the weight of a person walking on the floor or the weight of furniture installed on the floor acts on the floor base material, no axial force acts on the screw. . Therefore, the ALC panel is not damaged, and a stable pullout strength can be maintained over a long period.

  As described above, the screw does not contact the floor base material at a portion other than the head. That is, the thread does not bite into the floor base material, and the trunk does not come into contact. For this reason, when an out-of-plane force is applied to the floor base material, this force is not transmitted to the screw via the screw thread and is not transmitted by contact friction. Therefore, the ALC panel is not damaged.

  Further, in the screw according to the present invention, the head portion, the trunk portion, and the screw thread portion are configured as a continuous tapping screw, and the valley diameter of the screw thread portion is larger than the diameter of the trunk portion and the screw thread portion from the head portion. The dimension up to the starting point is larger than the thickness of the floor base material. For this reason, by screwing in from the surface side of the floor base material, the floor base material and the heat insulating material can be passed through and fastened to the ALC panel constituting the floor slab.

  And when the screw thread part is fastened to the ALC panel, the head part of the screw comes into contact with the floor base material, but the drum part is formed with a diameter smaller than the valley diameter of the screw thread part. There is no contact with the floor base material. Therefore, when an out-of-plane force is applied to the floor base material, this force is not transmitted to the body of the screw, and no axial force is applied to the screw. For this reason, the ALC panel is not damaged, and a stable pullout strength can be maintained over a long period of time.

  Further, as described above, the screw body does not come into contact with the floor base material and the heat insulating material, so that the resistance due to the contact friction is reduced, and the screw can be easily screwed in with a small force.

  In the following, a floor heat insulating material fixing structure according to the present invention and a most preferred form of a screw advantageous in carrying out this fixing structure will be described. The structure of the floor heat insulating material according to the present invention is such that when the heat insulating material and the floor base material are laid on the upper surface of the floor slab composed of the ALC panel, and the screw is fixed from the upper surface of the laid floor base material with the screw, Only in contact with the floor base material, i.e., the threads do not bite into the floor base material and the barrel does not frictionally contact the floor base material. Does not cause a large pressing force on the contact area between the screw thread and the ALC panel, and therefore maintains a stable pull-out strength without causing local damage to the ALC panel screw fastening area. It is something that can be done.

  In addition, the screw according to the present invention is configured as a tapping screw composed of a head, a body, and a screw thread, but the dimension from the head to the starting point of the screw thread is larger than the thickness of the floor base material. Since the root diameter of the threaded part is larger than the diameter of the body part, the body part is screwed from the upper surface side of the floor base material toward the floor slab and the threaded part is fastened to the ALC panel. There is no contact with the floor base material. For this reason, when an out-of-plane force is applied to the floor base material, this force is not transmitted to the screw. Therefore, a stable pull-out strength can be obtained without causing local damage at the screw fastening portion of the ALC panel. It is possible to hold

  The floor heat insulating material fixing structure and screw according to the present embodiment will be described with reference to the drawings. FIG. 1 is a diagram for explaining a configuration of a fixing structure for a floor heat insulating material. FIG. 2 is a diagram illustrating the configuration of the screw.

  As shown in FIG. 1, the fixing structure of the heat insulating material applied to the present embodiment is such that the screw A that penetrates the floor base material 11 and the heat insulating material 12 is fastened to the ALC panel 13 that constitutes the floor slab. The propulsive force A is transmitted to the floor base material 11 via the head 1 and fixed.

  The material of the floor base material 11 is not particularly limited, and boards such as plywood and particle boards generally used as a floor base material can be used. Therefore, the thickness of the floor base material 11 is not limited. Further, a floor finishing material (not shown) is applied to the upper surface of the floor base material 11 by means such as sticking, but there is no limitation on what material is used as the finishing material.

  The heat insulating material 12 is spread over the entire upper surface of the ALC panel 13 constituting the floor slab. The material of the heat insulating material 12 is not particularly limited, and a heat insulating material generally used as a floor heat insulating material can be used. Therefore, the specifications such as the thickness and hardness of the heat insulating material are not limited.

  As the ALC panel, an ALC panel generally configured as a floor panel is used, and dimensions including thickness are not particularly limited.

  The floor slab is configured by placing and supporting the ends of a number of ALC panels 13 on a beam (not shown). The floor slab may be constructed by using the upper surface of the ALC panel 13 as it is or may be constructed by applying a self-leveling material on the upper surface. Of course, any configuration may be used.

  The screw A is configured as shown in FIG. That is, the screw A is a tapping screw dedicated to ALC having a head portion 1, a body portion 2 formed continuously with the head portion 1, and a screw thread portion 3 formed continuously with the body portion 2. It is configured.

  In this embodiment, the head 1 is formed in a dish shape, and is buried in the surface side of the floor base material 11 when fastened to the ALC panel 13 via a floor base material 11 and a heat insulating material 12 described later. Thus, the tapered surface 1a is configured to come into contact with the floor base material 11. The head 1 needs to have a tapered surface 1a that comes into contact with the floor base material 11, but does not necessarily have a dish shape, and may be formed in a pan shape. Further, a plus hole, a minus hole, or a hexagon hole (not shown) is formed on the surface side of the head 1, and can be easily fastened by using a tool equipped with a screwdriver applied to these holes. It is configured as follows.

  The body portion 2 is formed between the taper surface 1a of the head portion 1 and the starting point 3a of the screw thread portion 3, and the length is from the surface of the head portion 1 to the starting point 3a of the screw thread portion 3. It has a dimension larger than the thickness of the floor base material 11. The length of the body portion 2 only needs to be larger than the above-described dimensions, and there is no problem as long as the length of the screw thread portion 3 is long enough to be fastened to the ALC panel 13.

  The screw thread portion 3 has a tip portion 3b formed in a sharp cone shape, and a screw is formed from the tip portion 3b through a tapered portion having a predetermined length. The diameter (valley diameter) of the valley 3 c in the screw thread portion 3 is larger than the outer diameter of the body portion 2, and the diameter (peak diameter) of the mountain 3 d is larger than the outer diameter of the head 1. Has small dimensions. The lead of the thread 3d in the thread part 3 is not limited, and has a lead that can exhibit a holding force necessary as a tapping screw dedicated to ALC. The length of the thread portion 3 has such a dimension that a necessary number of threads 3d can bite into the ALC.

  In the screw A configured as described above, for example, the head 1 is mounted on a driver gripped by an electric tool, and is screwed from the upper surface of the heat insulating material 12 and the floor base material 11 previously laid on the upper surface of the ALC panel 13. By doing so, the thread 3d is cut as a cone from the tip 3b of the screw thread 3 and simultaneously pushed into the crest 3d, and the taper portion 1a of the head 1 is buried in the floor foundation 11 so that the floor foundation 11 The heat insulating material 12 can be fixed to the ALC panel 13.

  When the screw A is fastened to the ALC panel 13 as described above, a hole 11a corresponding to the diameter of the valley 3c is formed in the floor base material 11 by the valley 3c constituting the screw thread portion 3 of the screw A. The body portion 2 of the screw A is fitted into the hole 11a, and the body portion 2 does not come into contact with the floor base material 11. That is, only the taper portion 1 a of the head 1 comes into contact with the floor base material 11.

  Since the screw A is configured as a tapping screw, the hole 11a is restricted to the diameter of the valley 3c of the thread portion 3, but is slightly smaller than the diameter of the valley 3c and is formed to have an accurate dimension. is not. For this reason, in FIG. 1, the hole 11a is shown with the dotted line.

  In the heat insulating material fixing structure as described above, when an out-of-plane force is applied to the floor base material 11, the floor base material 11 is not in frictional contact with the body 2 of the screw A. It is not transmitted to A but directly to the heat insulating material 12. This force is absorbed by the elasticity of the heat insulating material 12 itself, and is transmitted to the screw A through the crest 3d biting into the heat insulating material 12, but the value of the force at this time becomes extremely small, and the ALC panel may be damaged. Is extremely small.

  Therefore, the pull-out strength of the screw A can be held in a stable state over a long period.

  In the fixing structure of the floor heat insulating material according to the present invention, the axial direction of the screw A that fixes the floor base material 11 and the heat insulating material 12 to the ALC panel 13 is caused by the out-of-plane force acting on the floor base material 11. Since no force is applied, a stable pullout strength can be maintained over a long period of time. For this reason, it is advantageous when used to realize a floor heat insulating structure of a steel structure building.

  Further, the screw A according to the present invention is extremely advantageous when used to realize the above-described floor heat insulating material fixing structure.

It is a figure explaining the structure of the fixing structure of a floor heat insulating material. It is a figure explaining the structure of a screw.

Explanation of symbols

A screw 1 head 1a taper part 2 trunk 3 screw thread part 3a starting point 3b tip part 3c valley 3d mountain 11 floor base material 12 heat insulating material 13 ALC panel

Claims (2)

A floor insulating material fixing structure in which a heat insulating material is laid on a floor slab made of lightweight aerated concrete panel, and the floor base material is overlaid on the upper surface of the heat insulating material and fixed with screws. A floor insulation material characterized in that when passing through and being fastened to the lightweight cellular concrete panel, and when the screw is fastened to the lightweight cellular concrete panel, only the head is in contact with the floor base material. Fixed structure. A screw used in the floor heat insulating material fixing structure according to claim 1, wherein the screw is a tapping screw comprising a head, a trunk continuous with the head, and a thread thread continuous with the trunk. The dimension from the head part to the threaded part through the body part is larger than the thickness of the floor base material, the thread diameter of the thread part is larger than the diameter of the body part, and the head diameter is A screw characterized by being formed larger than the crest diameter.

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