JP6810431B1 - Fixing bracket of fireproof coating sheet, fixing structure of fireproof coating sheet and fireproof coating structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fireproof coating sheet for surrounding a steel beam arranged at a portion where an outer wall material and a floor slab are in an orthogonal state, without requiring a troublesome process at the site or an electric tool or the like. Provided are a fixing bracket of a fireproof coating sheet that can be easily mounted on the back surface, and a fixing structure and a fireproof coating structure of the fireproof coating sheet using the fixing bracket. SOLUTION: A fixing metal fitting 4 (4A) is made of a metal plate having spring elasticity, and has a shape in which a lower surface portion 41, a back surface portion 42, and an upper surface portion 43 are continuous in a substantially U-shape in a side view. The fireproof coating sheet 5 that covers the lip portion 35 of the rail member 34 to which the outer wall material 1 is attached is elastically sandwiched between the lower surface portion 41 and the upper surface portion 43 of the fixing bracket 4 (4A). [Selection diagram] Fig. 6

Description

The present application relates to a fixing bracket of a fireproof coating sheet for superimposing and fastening a heat-expandable fireproof coating sheet on the back surface of an outer wall material, and a fixing structure and a fireproof coating structure of the fireproof coating sheet using the fixing bracket.

For steel-framed buildings, in order to delay the decrease in strength of the skeleton due to the heat of a fire, it is obligatory by laws and regulations to apply an appropriate fireproof coating around the steel beams and columns that make up the skeleton. ing. Patent Documents 1 and 2 and the like propose a fireproof coating structure that surrounds a steel beam and a steel column by using a flexible fireproof coating sheet that exhibits heat insulating properties by foaming and expanding due to thermal heat. The fireproof coating sheet is formed on the surface of a sheet-like molded product made of a heat-expandable resin composition obtained by mixing a phosphorus compound, a heat-expandable graphite, an inorganic filler, etc. with an epoxy resin or synthetic rubber, and a glass cloth, carbon fiber, etc. It is formed by laminating non-combustible material layers made of metal foils such as inorganic fiber sheets, aluminum foils, and copper foils. For example, "Fiblock (registered trademark)" manufactured by Sekisui Chemical Industry Co., Ltd. is typical.

Conventionally, the following construction methods have been adopted for fixing the fireproof coating sheet around the steel frame material.
(1) A mounting pin is welded to the edge of the steel frame in advance, and a fireproof coating sheet spread around the steel frame is pierced into the mounting pin to fix it.
(2) A non-combustible plate made of calcium silicate board, gypsum board, rock wool board, etc. is attached around the steel frame material using an appropriate fixture or fire-resistant adhesive, and a fire-resistant coating sheet is attached to the outside of the non-combustible plate material. And fasten it to the non-combustible board with nails, screws, tackers, etc.
(3) A floor slab or outer wall material (outer wall panel) made of foamed lightweight concrete (ALC) is attached to the steel frame material, and the edge of the fireproof coating sheet stretched so as to wrap the steel frame material is attached to the floor slab or outer wall material with screws. Fasten with a tacker or the like.

FIG. 4 (second embodiment) of Patent Document 1 and FIG. 6 (a) of Patent Document 2 also disclose a fireproof coating structure applied to a steel beam arranged on an outer peripheral portion of a building. For the steel beam on the outer periphery, which is arranged at the part where the outer wall material (outer wall panel) having the predetermined fire resistance and the floor slab meet in an orthogonal state, the side surface and the bottom surface not facing the outer wall material are covered with a fireproof coating sheet. The lower edge portion is overlapped on the back surface of the outer wall material, the upper edge portion is overlapped on the lower surface of the floor slab, and each is fastened with a fixture such as a nail or a pin. As a result, a composite fireproof coating structure (synthetic fireproof coating structure) in which the outer wall material, the fireproof coating sheet, and the floor slab are continuous is formed.

Japanese Unexamined Patent Publication No. 2010-43444 Registered Utility Model No. 3171133

The refractory coating sheet itself can be easily cut to a desired size using scissors or a cutter. However, in order to fix the fireproof coating sheet around the steel frame material, the mounting pin is welded to the steel frame material in advance, or the non-combustible plate material used as the fixing base is processed according to the size of the steel frame material. A troublesome process such as attaching to the surroundings was required. In addition, electric tools such as an electric screwdriver and a tacker were required for fastening the fireproof coating sheet.

The invention disclosed in the present application is made to improve the efficiency of such construction circumstances, and in particular, a fireproof coating for surrounding a steel beam on the outer periphery arranged at a portion where the outer wall material and the floor slab meet in an orthogonal state. A fixing bracket for a fireproof coating sheet that can be easily fastened to the sheet without the need for troublesome steps on site or power tools, a fixing structure for the fireproof coating sheet using the fixing bracket, and a fireproof coating structure. It is to provide.

The fixing bracket of the fireproof coating sheet disclosed in the present application for achieving the above-mentioned object is a fixing bracket for covering and fastening a flexible fireproof coating sheet on the lip portion of the rail member to which the outer wall material is attached. It is made of a metal plate having spring elasticity, and the lower surface portion, the back surface portion, and the upper surface portion have a shape in which the lower surface portion, the back surface portion, and the upper surface portion are continuous in a substantially U-shape in a side view, and the fireproof coating sheet covering the lip portion is the lower surface portion. It is characterized as being formed so as to be elastically sandwiched between the surface portion and the upper surface portion.

Further, it is characterized in that an engaging piece folded upward is formed on the tip edge of the lower surface portion of the fixing bracket, and the engaging piece engages with the base portion of the lip portion.

Further, the fixing metal fitting of the fireproof coating sheet according to other configurations is a fixing metal fitting for covering the lip portion of the rail member to which the outer wall material is attached with the flexible fireproof coating sheet and fastening the bottom portion. And a pair of side surface portions that are raised upward from the left and right side edges thereof, and a fitting groove that opens in a U-shape in a side view is formed in each of the side surface portions, and the fitting groove is said to be said. It is characterized as being formed to fit on a fireproof coating sheet overlaid on the lip.

Further, it is characterized as having a saw blade-shaped biting protrusion formed on at least one of the upper side portion and the lower side portion forming the inner edge of the fitting groove in the fixing bracket.

Further, in the fixing structure of the fireproof coating sheet disclosed in the present application in order to achieve the above-mentioned object, a rail member for attaching an outer wall material is coupled to the steel frame beam, and the rail member is directed toward the steel frame beam side. A lip portion is provided so as to project, and the outer wall material is built with its back surface attached to the rail member, and a flexible fireproof coating sheet is laminated and fastened to the back surface of the outer wall material. It is a fixed structure of the fireproof coating sheet, and the edge portion of the fireproof coating sheet is covered with the lip portion so as to wrap the lip portion from above and below, and the fireproof coating sheet covered with the lip portion is further sandwiched from above and below. Characterized as being fitted with a shaped fixing bracket.

Further, the fixing structure of the fireproof coating sheet disclosed in the present application in order to achieve the above-mentioned object includes the side surface of the steel frame beam arranged at the portion where the outer wall material and the floor slab meet in an orthogonal state and the side surface not facing the outer wall material. In a fireproof coating structure in which the bottom surface is covered with a flexible fireproof coating sheet and the edges of the fireproof coating sheet are laminated and fastened to the back surface of the outer wall material and the lower surface of the floor slab, respectively, the steel beam A rail member for attaching the outer wall material is joined along the lower flange, and the outer wall material is built with its back surface attached to the rail member, and the steel beam side is attached to the rail member. A lip portion is provided so as to project toward the surface, the edge portion of the fireproof coating sheet covers the lip portion from above and below, and the fireproof coating sheet covered with the lip portion is further sandwiched from above and below. Characterized as being fitted with a clip-shaped fixing bracket.

In the fixed structure or the fireproof coating structure of the fireproof coating sheet, the fixing metal fitting can selectively adopt the above-mentioned configuration.

By using the fixing bracket of the fireproof coating sheet configured as described above, the edge of the fireproof coating sheet that covers the steel beam can be overlapped on the back surface of the outer wall material without the need for troublesome steps or power tools. Can be easily fastened. As a result, the workability at the site is significantly improved. Moreover, this fixing bracket firmly holds the fireproof coating sheet so that it will not fall off or shift even if the fireproof coating sheet expands in the event of a fire.

Then, if a fixing structure of the fireproof coating sheet using this fixing bracket and a fireproof coating structure are adopted, an appropriate fireproof coating is applied to the steel beam on the outer periphery arranged at the portion where the outer wall material and the floor slab are in an orthogonal state. Can be easily installed.

It is sectional drawing which shows an example of the outer wall structure of the steel-framed building to which the invention disclosed in this application is applied. It is an exploded perspective view of the outer wall material which constitutes the outer wall structure, and the outer wall material mounting metal fittings. It is a perspective view of the lower part of the steel frame beam in the said outer wall structure. It is a perspective view of the upper part of the steel frame beam in the said outer wall structure. It is a perspective view of the fixing metal fitting which concerns on 1st Embodiment of the invention disclosed in this application. It is explanatory drawing which shows the structure which fixes the refractory coating sheet by using the fixing metal fitting of FIG. It is a perspective view of the fixing metal fitting which concerns on 2nd Embodiment of the invention disclosed in this application. It is explanatory drawing which shows the structure which fixes the refractory coating sheet by using the fixing metal fitting of FIG.

<Outer wall structure>
The applicant has put into practical use a curtain wall type outer wall structure as shown in FIGS. 1 to 4 as an outer wall structure particularly suitable for a steel-framed industrialized house. The outer wall material 1 adopted for this outer wall structure is formed into a panel shape by extrusion molding a cement-based material, a ceramic-based material, or the like, and itself exhibits a predetermined fire resistance performance in the event of a fire. An undulating pattern that imitates the texture of natural stone or brick is formed on the front surface (outdoor side surface) of the outer wall material 1, and the back surface (indoor side surface) is formed substantially flat, which is intermediate in the thickness direction. A plurality of hollow holes 11 communicating with each other in the vertical direction are formed in the portion.

The outer wall material 1 is attached to a steel beam 3 or the like (foundation on the lowest floor) constituting the skeleton by using a dedicated outer wall material mounting bracket 2. The outer wall material mounting bracket 2 is a member formed by pressing a steel plate or the like, and an elongated hole 21 extending in the vertical direction is provided in the center thereof, and a substantially V-shaped side view is provided on either the upper or lower edge. The hook portion 22 is provided. The outer wall material mounting bracket 2 is applied to the vicinity of the four corners of the back surface of the outer wall material 1 with the hook portion 22 facing the upper edge side or the lower edge side of the outer wall material 1. Then, the bolt 23 to be inserted into the elongated hole 21 from the indoor side is inserted into the prepared hole 12 formed on the back surface of the outer wall material 1 and has a spring plate piece previously inserted into the hollow hole 11 of the outer wall material 1. It is screwed into the nut metal fitting 24 of.

On the other hand, carry-out fasteners 33 made of steel plates are joined to the upper and lower flanges 31 and 32 of the steel beam 3 by welding or the like. A rail member 34 for attaching the outer wall material 1 is joined to the carry-out fastener 33 by welding or the like. The rail member 34 is made of angle steel, C-shaped steel, or the like having a lip portion 35 on at least one side edge, and the lip portion 35 is directed toward the steel beam 3 side (indoor side), and the upper side of the side of the steel beam 3 and the upper side of the rail member 34. They are arranged on the lower side so as to extend in the horizontal direction.

The carry-out fastener 33 attached to the upper flange 31 of the steel frame beam 3 extends to the built-in position of the outer wall material 1 so as to support the lower edge of the outer wall material 1. Then, the outer wall material 1 lifted by a crane or the like is built on the outer surface of the rail member 34, the hook portion 22 of the outer wall material mounting bracket 2 is engaged with the lip portion 35 of the rail member 34, and the bolt is bolted from the indoor side. 23 is fastened with a predetermined tightening torque. The four corners of the outer wall material 1 attached to the steel frame beam 3 in this way are displaced horizontally along the rail member 34, and the outer wall material 1 is vertically displaced within the range of the elongated holes 21 formed in the outer wall material mounting bracket 2. By displacing to, it becomes possible to suitably follow the inter-story displacement of the skeleton due to an earthquake or the like.

<Fixing bracket / fixing structure of fireproof coating sheet>
The fixing bracket of the fireproof coating sheet (hereinafter, simply referred to as “fixing bracket”) which forms the main part of the invention disclosed in the present application is, for example, the fireproof coating sheet with respect to the lip portion 35 of the rail member 34 in the above-mentioned outer wall structure. It is optimized so that it can be fastened. The refractory coating sheet is a flexible sheet material described in the background technology column, which exhibits heat insulating properties by foaming and expanding due to thermal heat.

FIG. 5 shows a fixing bracket 4 (4A) according to the first embodiment. The fixing bracket 4A is made of a metal plate having spring elasticity, and has a shape in which a lower surface portion 41, a back surface portion 42, and an upper surface portion 43 are continuous in a substantially U-shape in a side view. The facing distance between the lower surface portion 41 and the upper surface portion 43 is narrower on the tip side than on the base side connected to the back surface portion 42. An engaging piece 44 that is folded upward is formed on the tip edge of the lower surface portion 41. Further, a pressing piece 45 that curves upward is formed on the tip edge of the upper surface portion 43.

FIG. 6 shows a structure for fixing the refractory coating sheet 5 using the fixing bracket 4A of FIG.

A rail member 34 for attaching the outer wall material 1 is connected to a steel beam 3 arranged at a portion where the outer wall material 1 and the floor slab 6 are in an orthogonal state with each other via a carry-out fastener 33, and the outer wall material 1 is the outer wall material 1. It is built so that the back surface is attached to the rail member 34. The rail member 34 connected to the lower flange 32 of the steel frame beam 3 is formed with a lip portion 35 that projects substantially the same width from a position slightly lower than the lower surface of the steel frame beam 3 toward the steel frame beam 3 side (indoor side). Has been done.

The floor slab 6 mounted on the steel beam 3 is made of a foamed lightweight concrete panel or the like, and itself exhibits a predetermined fire resistance performance in the event of a fire. The gaps formed between the edge portion of the floor slab 6 and the outer wall material 1 are filled with heat insulating materials 71 and 72 made of, for example, glass wool mat.

Further, a heat insulating material 73 made of glass wool mat or the like is also applied to the side surface of the steel frame beam 3 on the side opposite to the outer wall material 1 to temporarily fix it. Then, the side surface of the heat insulating material 73 and the lower surface of the steel frame beam 3 are covered with the flexible fireproof coating sheet 5. The upper edge portion of the fireproof coating sheet 5 is superposed on the lower surface of the floor slab 6, and is fastened via an appropriate fixture 74.

The lower edge portion of the fireproof coating sheet 5 is overlapped with the back surface of the outer wall material 1, and is placed on the rail member 34 so as to sandwich the lip portion 35 of the rail member 34 from above and below as shown in the enlarged view on the right side of FIG. The fixing metal fittings 4A are attached at appropriate intervals so as to further sandwich the fireproof coating sheet 5 over the lip portion 35 from above and below. The lip portion 35 and the fireproof coating sheet 5 are elastically sandwiched between the lower surface portion 41 and the upper surface portion 43 of the fixing bracket 4A. The engaging piece 44 formed on the tip edge of the lower surface portion 41 engages with the base portion of the lip portion 35 formed by bending the lower edge portion of the rail member 34 to prevent the fixing bracket 4A from coming off. The holding piece 45 formed on the tip edge of the upper surface portion 43 presses the fireproof coating sheet 5 along the inner side surface of the rail member 34. By using this fixing bracket 4A, the edge portion of the fireproof coating sheet 5 that covers the steel frame beam 3 can be extremely easily overlapped and fastened on the back surface of the outer wall material 1 without the need for an electric tool or the like. .. The outer wall material mounting bracket 2 (FIGS. 1 and 4) that attaches the outer wall material 1 to the rail member 34 is also covered with the fireproof coating sheet 5.

FIG. 7 shows the fixing bracket 4B according to the second embodiment. The fixing bracket 4B includes a bottom surface portion 46 having a substantially rectangular top view and a pair of side surface portions 47 raised upward from the left and right side edges thereof, and each side surface portion 47 has a U-shaped side view. A fitting groove 48 is formed so as to open in. A saw blade-shaped biting protrusion 49 is formed on at least one of the upper side portion and the lower side portion forming the inner edge of the fitting groove 48.

As shown in FIG. 8, the fixing bracket 4B is fitted to the lip portion 35 so as to sandwich the fireproof coating sheet 5 over the lip portion 35 of the rail member 34 from above and below. The saw blade-shaped biting protrusion 49 bites into the surface of the fireproof coating sheet 5 to prevent the fixing metal fitting 4B from coming off. Even with such a fixing bracket 4B, the edge portion of the fireproof coating sheet 5 that covers the steel frame beam 3 can be extremely easily overlapped and fastened on the back surface of the outer wall material 1.

It was confirmed by a verification test that the above-mentioned fixing brackets 4 (4A, 4B) firmly hold the fireproof coating sheet 5 without falling off or shifting from the rail member 34 even if the fireproof coating sheet 5 expands in the event of a fire. doing. By fastening the fireproof coating sheet 5 to the back surface of the outer wall material 1 using the fixing brackets 4 (4A, 4B), the fireproof coating sheet 5 is stretched tightly between the outer wall material 1 and the steel frame beam 3. A fireproof coating structure can be efficiently realized.

The technical scope of the invention disclosed in the present application should not be interpreted in a limited manner by the illustrated embodiment, but should be conceptually interpreted based on the description of the scope of claims. In carrying out the present invention, the shapes, positional relationships, dimensions, joining forms, etc. of members / parts that are not specifically specified in the claims are within the range in which substantially the same effects as those of the exemplified forms can be obtained. It can be modified and carried out as appropriate.

For example, regarding the steel beam 3, not only the H-shaped steel illustrated, but also similar shaped steel materials such as I-shaped steel, channel steel, hat-shaped steel, and laminated beams in which two channel steels are joined back to back. It is also applicable to. Further, the shape of the outer wall material 1, the shape of the rail member 34, the connecting structure of the rail member 34 and the steel frame beam 3, the mounting structure of the outer wall material 1 to the rail member 34, and the like are appropriately determined without departing from the gist of the invention. It can be modified.

The invention disclosed in the present application can be widely used for fireproof coating of various steel-framed buildings.

1 Outer wall material 11 Hollow hole 12 Lower hole 2 Outer wall material mounting bracket 21 Long hole 22 Hook part 23 Bolt 24 Nut metal fitting 3 Steel beam 31 Upper flange 32 Lower flange 33 Carry-out fastener 34 Rail member 35 Lip part 4 (4A, 4B) Fixed Bracket 41 Bottom 42 Back 43 Top 44 Engagement piece 45 Pressing piece 46 Bottom 47 Side 48 Fitting groove 49 Biting protrusion 5 Fireproof coating sheet 6 Floor slab 71, 72, 73 Insulation material 74 Fixture

Claims (8)

A fixing bracket for covering and fastening a flexible fireproof coating sheet to the lip portion of the rail member to which the outer wall material is attached.
It consists of a metal plate with spring elasticity
The lower surface portion, the back surface portion, and the upper surface portion have a shape that is continuous in a substantially U-shape in the side view.
A fixing bracket for a fireproof coating sheet, characterized in that the fireproof coating sheet covered on the lip portion is formed so as to be elastically sandwiched between the lower surface portion and the upper surface portion. In the fixing bracket of the fireproof coating sheet according to claim 1,
An engaging piece folded upward is formed on the tip edge of the lower surface portion, and the engaging piece is formed.
A fixing bracket for a refractory coating sheet, wherein the engaging piece engages with the base of the lip portion. A fixing bracket for covering and fastening a flexible fireproof coating sheet to the lip portion of the rail member to which the outer wall material is attached.
It is provided with a bottom surface portion and a pair of side surface portions that are raised upward from the left and right side edges thereof.
A fitting groove that opens in a U-shape in a side view is formed on each of the side surfaces.
A fixing bracket for a fireproof coating sheet, characterized in that the fitting groove is formed so as to be fitted to the fireproof coating sheet overlaid on the lip portion. In the fixing bracket of the fireproof coating sheet according to claim 3,
A fixing bracket for a refractory coating sheet, characterized in that a saw blade-shaped biting protrusion is formed on at least one of an upper side portion and a lower side portion constituting the inner edge of the fitting groove. Rail members for attaching the outer wall material are connected to the steel beam,
The rail member is provided with a lip portion that projects toward the steel beam side.
The outer wall material is built with its back surface attached to the rail member.
It is a fixed structure of the fireproof coating sheet in which a flexible fireproof coating sheet is laminated and fastened on the back surface of the outer wall material.
The edge portion of the fireproof coating sheet is placed over the lip portion so as to wrap the lip portion from above and below.
A fixing structure of a fireproof coating sheet, characterized in that a clip-shaped fixing bracket is attached so as to sandwich the fireproof coating sheet over the lip portion from above and below. In the fixing structure of the fireproof coating sheet according to claim 5,
The fixing structure of the fireproof coating sheet, wherein the fixing metal fitting is the fixing metal fitting of the fireproof coating sheet according to any one of claims 1 to 4. The side surface and bottom surface of the steel beam arranged at the portion where the outer wall material and the floor slab meet in an orthogonal state are covered with a flexible fireproof coating sheet, and the edge of the fireproof coating sheet is covered. In the fireproof coating structure that is laminated and fastened to the back surface of the outer wall material and the lower surface of the floor slab, respectively.
A rail member for attaching the outer wall material is joined along the lower flange of the steel beam.
The outer wall material is built with its back surface attached to the rail member.
The rail member is provided with a lip portion that projects toward the steel beam side.
The edge portion of the fireproof coating sheet is placed over the lip portion so as to wrap the lip portion from above and below.
A fireproof coating structure characterized in that a clip-shaped fixing bracket is attached so as to further sandwich the fireproof coating sheet over the lip portion from above and below. In the fireproof coating structure according to claim 7,
A fireproof coating structure, wherein the fixing bracket is the fixing bracket of the fireproof coating sheet according to any one of claims 1 to 4.

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