Spacers for fire-resistant partition walls and fire-resistant partition walls using the same
The spacer for fire-resistant partition walls addresses the inefficiencies of heat-melting materials by securing a space for foamed sheets to expand, reducing costs and labor, and eliminating waste in construction.
Patent Information
- Application Number
- JP2025021546
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-02-13
- Publication Date
- 2026-08-25
AI Technical Summary
Conventional fire-resistant partition walls using lightweight steel frames require heat-melting materials for expanding foamed fire-resistant sheets, increasing material costs and construction time, and generating waste from on-site cutting.
A spacer for fire-resistant partition walls with a male threaded portion, head, and shaft, featuring a stopper to limit embedding depth and secure a gap for the foamed fire-resistant sheet to expand, eliminating the need for heat-melting agents and reducing labor and waste.
The spacer ensures a space for the foamed fire-resistant sheet to expand without heat-melting materials, reducing material costs and construction effort, and eliminating the need for disposing of scraps.
Smart Images
Figure 2026135800000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a partition wall of a building, and more particularly to a spacer for a fire-resistant partition wall used for constructing a fire-resistant partition wall having fire resistance and a fire-resistant partition wall using the same.
Background Art
[0002] Conventionally, a partition wall using a lightweight steel frame as a base has been used as a partition wall of a building. Such a partition wall is configured by attaching a gypsum board to a lightweight steel frame base including runners fixed to the floor surface and the ceiling surface and studs erected at a predetermined interval across the upper and lower runners. At this time, two gypsum boards are attached in layers to give the partition wall fire resistance.
[0003] However, using two gypsum boards in layers increases the material cost and also takes time and effort in construction. Therefore, as a method of giving fire resistance to a partition wall with a single gypsum board, a method of arranging a foamed fire-resistant sheet on the back surface of the gypsum board as shown in FIG. 8 can be considered. The foamed fire-resistant sheet is in the form of a sheet having a thickness of about 0.7 mm, and by foaming and expanding due to the high temperature during a fire to form a heat-insulating layer containing air on the back surface of the gypsum board, the temperature rise of the lightweight steel frame base is delayed.
[0004] In order for the foamed fire-resistant sheet to foam and form a heat-insulating layer, a space for the foamed fire-resistant sheet to expand is required on the back surface of the gypsum board. In order to fix the gypsum board in a state where this space is secured, a heat-melting material is arranged as a spacer on the surface of the runners and studs which are the lightweight steel frame base, and the gypsum board is abutted and fixed on its surface. During a fire, the heat-melting material melts due to the high temperature, thereby forming a space for the foamed fire-resistant sheet to expand between the lightweight steel frame base and the gypsum board. The heat-melting material is, for example, styrofoam (registered trademark).
Summary of the Invention
[0005] However, fire-resistant partition walls using heat-soluble materials have the following problems: (1) The heat-melting agent is used solely to create space for the fire-resistant sheet to expand at high temperatures, but this incurs material costs. (2) The heat-melting material is cut on-site to match the width and length of the lightweight steel frame substructure and placed on the surface of the lightweight steel frame substructure, which makes the construction process time-consuming. (3) Since the heat-melting material is cut on-site to match the width and length of the lightweight steel frame substructure, the resulting scraps must be disposed of as waste.
[0006] The present invention aims to provide a spacer for fire-resistant partition walls and a fire-resistant partition wall using the same, which allows for the construction of a fire-resistant partition wall using lightweight steel frames as a base without the use of heat-melting materials. [Means for solving the problem]
[0007] The present invention provides a spacer for a fire-resistant partition wall, having a male threaded portion formed at one end, a head formed at the other end, and a shaft portion connecting the male threaded portion and the head, wherein the head has a fitting hole, and the shaft portion has a stopper with a diameter larger than the outer diameter of the male threaded portion. The stopper and the head-side end of the threads of the male screw portion may be separated by a distance greater than or equal to the thickness of the lightweight steel frame base to be erected. Furthermore, the present invention provides a fire-resistant partition wall using spacers for fire-resistant partition walls, comprising: spacers for fire-resistant partition walls erected at predetermined intervals on the surface of a lightweight steel frame substrate; a foamed fire-resistant sheet that abuts against the top of the head of the spacer for fire-resistant partition wall; a gypsum board that overlaps with the foamed fire-resistant sheet; and screws that penetrate the gypsum board and the foamed fire-resistant sheet and are screwed into the lightweight steel frame substrate, characterized in that the stopper of the spacer for fire-resistant partition wall abuts against the surface of the lightweight steel frame substrate.
[0008] In addition, the present invention provides a spacer for a fire-resistant partition wall, which has a first male threaded portion formed at one end, a head formed at the other end, and a shaft portion connecting the first male threaded portion and the head, the head having a fitting hole, and the shaft portion having a stopper with a larger diameter than the outer diameter of the first male threaded portion and a second male threaded portion with threads formed on its outer circumference. The outer diameter of the second male threaded portion may be larger than the outer diameter of the stopper. The distance between the stopper and the head end of the threads on the male screw part may be 0.4 to 0.8 mm. Furthermore, the present invention provides a fire-resistant partition wall using the fire-resistant partition wall spacer of the present invention, comprising fire-resistant partition wall spacers erected at predetermined intervals on the surface of a lightweight steel frame substrate, a foamed fire-resistant sheet, and a gypsum board that overlaps with the foamed fire-resistant sheet, characterized in that the stopper of the fire-resistant partition wall spacer abuts against the surface of the lightweight steel frame substrate, and the foamed fire-resistant sheet and gypsum board are screwed into the second male threaded portion of the fire-resistant partition wall spacer at a position away from the lightweight steel frame substrate. [Effects of the Invention]
[0009] The present invention, by means of solving the above-mentioned problems, can achieve at least one of the following effects. (1) The spacer for fire-resistant partition walls has a stopper formed on the shaft, which limits the depth to which it can be embedded in the lightweight steel frame substrate, and ensures a gap between the top of the head and the male screw side of the stopper between the top of the head and the lightweight steel frame substrate. (2) By attaching the foamed fire-resistant sheet on the back of the gypsum board to the head of the spacer for the fire-resistant partition wall, a space can be secured for the foamed fire-resistant sheet to expand at high temperatures, eliminating the need for a heat melting agent and reducing material costs. (3) The labor involved in cutting and installing the heat-melting material is eliminated, and the resulting scraps do not need to be disposed of as waste. [Brief explanation of the drawing]
[0010] [Figure 1] Perspective view of the fire-resistant partition wall of the present invention according to Example 1 [Figure 2] Perspective view of the spacer for the fireproof partition wall of the present invention according to Example 1 [Figure 3] Cross-sectional view of the fireproof partition wall of the present invention according to Example 1 [Figure 4] Perspective view of the spacer for the fireproof partition wall of the present invention according to Example 2 [Figure 5] Explanation diagram (1) of the construction method of the fireproof partition wall using the spacer for the fireproof partition wall of the present invention according to Example 2 [Figure 6] Explanation diagram (2) of the construction method of the fireproof partition wall using the spacer for the fireproof partition wall of the present invention according to Example 2 [Figure 7] Explanation diagram (3) of the construction method of the fireproof partition wall using the spacer for the fireproof partition wall of the present invention according to Example 2 [Figure 8] Perspective view of the fireproof partition wall using a thermally fusible material
Mode for Carrying Out the Invention
[0011] Hereinafter, based on the examples shown in the drawings, the present invention will be described in detail.
Examples
[0012] (1) Structure of the fireproof partition wall (Figure 1) The fireproof partition wall of the present invention is configured by attaching a foamed fireproof sheet 2 and a gypsum board 3 to a lightweight steel frame base 1 provided with runners 11 and studs 12. On the surface of the lightweight steel frame base 1, spacers 4 for the fireproof partition wall are erected at predetermined intervals.
[0013] (2) Spacer for the fireproof partition wall The spacer 4 for the fireproof partition wall has a male screw portion 41 formed at one end for screwing onto the lightweight steel frame base 1, a head portion 42 formed at the other end having a fitting hole such as a cross hole for fitting a driver, and a columnar shaft portion 43 connecting the male screw portion 41 and the head portion 42 (Figure 2). The male screw portion 41 is a double-threaded screw for screwing into the lightweight steel frame base 1. Further, on the shaft portion 43, a male screw portion 41 having an outer diameter larger than that of the shaft portion 43 and a stopper 44 are formed.
[0014] (2.1) Distance between the head and the stopper The top of the head 42 of the spacer 4 for the refractory partition wall and the surface on the male screw portion 41 side of the stopper 44 are separated by a distance L (FIG. 3). And, by forming the stopper 44 on the shaft portion 43 of the spacer 4 for the refractory partition wall, the embedding depth after screwing the male screw portion 41 to the lightweight steel frame base 1 by the stopper 44 is limited, and between the top of the head 42 and the lightweight steel frame base 1, the distance L between the top of the head 42 and the surface on the male screw portion 41 side of the stopper 44 is ensured, and a space S is formed.
[0015] (3) Structure of the refractory partition wall The refractory partition wall using the spacer 4 for the refractory partition wall of the present invention is provided with the spacer 4 for the refractory partition wall standing on the surface of the lightweight steel frame base 1 at a predetermined interval, and the foamed refractory sheet 2 and the gypsum board 3 are polymerized and abutted against the top of the head 42 of the spacer 4 for the refractory partition wall. With this configuration, a space S is formed by the distance L between the top of the head 42 of the spacer 4 for the refractory partition wall and the surface on the male screw portion 41 side of the stopper 44. The foamed refractory sheet 2 and the gypsum board 3 penetrate through the foamed refractory sheet 2 and the space S from the surface of the gypsum board 3 and are fixed by screws 5 screwed to the lightweight steel frame base 1. With this structure, the spacer 4 for the refractory partition wall secures a space S for the foamed refractory sheet 2 to expand at high temperatures, eliminating the need for a heat melting material and reducing the material cost. Also, there is no need for the laborious cutting and installation work of the heat melting material, nor is there a need to dispose of the generated end materials as waste.
Example
[0016] (1) Spacer for refractory partition wall having a second male screw portion The fire-resistant partition wall spacer 4 in this embodiment has a first male threaded portion 41a formed at one end for screwing into the lightweight steel frame base 1, a trumpet-shaped head 42 formed at the other end having a fitting hole such as a Phillips head for fitting a screwdriver, and a cylindrical shaft portion 43 connecting the first male threaded portion 41a and the head portion 42 (Figure 4). A stopper 44 is formed on the shaft portion 43, with a diameter larger than the outer diameter of the first male threaded portion 41a and the shaft portion 43. The first male threaded portion 41a is a double-threaded thread because it is screwed into the lightweight steel frame base 1. The stopper 44 is formed approximately 0.4 to 0.8 mm away from the head 42 side end of the thread 411a of the first male threaded portion 41a, which is greater than or equal to the thickness of the lightweight steel frame base 1. Furthermore, a second male threaded portion 431 is formed on the outer circumference of the shaft portion 43. The outer diameter of the second male threaded portion 431 is larger than the outer diameter of the stopper 44. The second male threaded portion 431 is a single-start thread because it is screwed into the gypsum board 3. The threads of the second male threaded portion 431 and one of the threads 411a of the first male threaded portion 41a are formed on the same thread rolling surface.
[0017] (2) Construction of fire-resistant partition walls In this embodiment, the fire-resistant partition wall using the fire-resistant partition wall spacer 4 is constructed by the following method.
[0018] (2.1) Arrangement of foamed fire-resistant sheets and gypsum boards The polymerized foamed fire-resistant sheet 2 and gypsum board 3 are brought into contact with the surface of the stud 12 (Figure 5).
[0019] (2.2) Screwing into the stud Next, screw the fire-resistant partition wall spacers 4 into the surface of the gypsum board 3. The fire-resistant partition wall spacer 4 has a first male threaded portion 41a and a second male threaded portion 431 which is larger in diameter than the stopper 44. Therefore, it penetrates the gypsum board 3 and the foamed fire-resistant sheet 2, the first male threaded portion 41a is screwed into the stud 12, and it is screwed in until the stopper 44 abuts against the stud 12 (Figure 6). At this time, the second male threaded portion 431 is screwed into the foamed fire-resistant sheet 2 and the gypsum board 3.
[0020] (2.3) Formation of the rear space The stopper 44 of the fire-resistant partition wall spacer 4 is formed at a distance greater than the thickness of the lightweight steel frame base 1 from the end of the thread 411a on the head side of the first male thread portion 41a. Therefore, after screwing the first male thread portion 41a into the stud 12, the fire-resistant partition wall spacer 4 can be rotated with the stopper 44 in contact. Furthermore, by rotating the fire-resistant partition wall spacer 4, the overlapping foamed fire-resistant sheet 2 and gypsum board 3 are pulled towards the head 42 by the second male screw portion 431. When the fire-resistant partition wall spacer 4 is rotated until the upper surface of the head 42 is approximately flush with the surface of the gypsum board 3, a space S is formed between the stud 12 and the foamed fire-resistant sheet 2 by pulling the gypsum board 3 in (Figure 7). In addition, in this structure, the foamed fire-resistant sheet 2 and gypsum board 3 are fixed by the second male screw portion 431, so no additional screws are needed, reducing the effort required for construction. Furthermore, in this structure, the fire-resistant partition wall spacer 4 secures a space S for the foamed fire-resistant sheet 2 to expand at high temperatures, eliminating the need for a heat-melting agent and thus reducing material costs. In addition, the labor involved in cutting and installing the heat-melting agent is eliminated, and the resulting scraps do not need to be disposed of as waste. [Explanation of Symbols]
[0021] 1 lightweight steel frame substructure, 11 runners, 12 studs, 2. Foamed fire-resistant sheet, 3. Gypsum board 4 Spacer for fire-resistant partition walls, 41 Male threaded section, 411 Thread, 41a First male threaded section, 411a Thread, 42 Head, 43 Shaft, 431 Second male threaded section, 44 Stopper 5 screws
Claims
1. A male threaded portion is formed at one end, A head formed at the other end, It has a shaft portion that connects the male screw portion and the head, The head has a fitting hole, The shaft portion has a stopper with a diameter larger than the outer diameter of the male threaded portion. Spacers for fire-resistant partition walls.
2. A first male threaded portion is formed at one end, A head formed at the other end, It has a shaft portion connecting the first male screw portion and the head portion, The head has a fitting hole, The aforementioned shaft portion is A stopper with a diameter larger than the outer diameter of the first male screw portion, It has a second male threaded portion with threads formed on its outer circumference, Spacers for fire-resistant partition walls.
3. The outer diameter of the second male screw portion is larger than the outer diameter of the stopper. A spacer for a fire-resistant partition wall according to claim 2.
4. The distance between the stopper and the head-side end of the threads of the male screw portion is 0.4 to 0.8 mm. A spacer for a fire-resistant partition wall according to claim 2.
5. A fire-resistant partition wall using the fire-resistant partition wall spacer described in claim 1, The fire-resistant partition wall spacers are erected at predetermined intervals on the surface of the lightweight steel frame base, A foamed fire-resistant sheet that abuts the top of the head of the fire-resistant partition wall spacer, The aforementioned foamed fire-resistant sheet and gypsum board that polymerize with it, It consists of screws that penetrate the gypsum board and the foamed fire-resistant sheet and are screwed into the lightweight steel frame base, The stopper of the fire-resistant partition wall spacer is characterized in that it abuts against the surface of the lightweight steel frame substrate. Fire-resistant partition wall.
6. A fire-resistant partition wall using the fire-resistant partition wall spacer described in any one of claims 2 to 4, The fire-resistant partition wall spacers are erected at predetermined intervals on the surface of the lightweight steel frame base, Foam fire-resistant sheet and It consists of the aforementioned foamed fire-resistant sheet and a gypsum board that polymerizes with it. The stopper of the fire-resistant partition wall spacer abuts against the surface of the lightweight steel frame base, The foamed fire-resistant sheet and the gypsum board are characterized in that they are screwed into the second male threaded portion of the fire-resistant partition wall spacer at a position away from the lightweight steel frame base. Fire-resistant partition wall.