Fire resistant structure

Abstract

To improve a fire resistance performance.SOLUTION: A fire resistant structure comprises: a sleeve 220 inserted in a through hole 200a; a first refractory sheet 100' wound around a refrigerant piping 210; a second refractory 100" wound adjacent to the first sheet; and a filler 230 provided between the sheets and the sleeve 220. A heat expansion member 102 is provided to a substrate 101, and the first and second refractory sheets 100', 100" are wound while the heat expansion member 102 is directed to the refrigerant piping 210. The heat expansion member 102 can slide to the refrigerant piping 210.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a fire-resistant structure for a through hole through which piping passes in a building. [Background technology]

[0002] A known fire prevention structure provided between a through hole formed in a fire-resistant structure and a plurality of elongated bodies includes a heat-expandable fire-resistant sheet material including a heat-expandable fire-resistant material layer and an adhesive layer provided along the entire longitudinal direction. The heat-expandable fire-resistant sheet material is wound around the plurality of elongated bodies and is adhesively held in place by the adhesive layer along the outer surface shape of the bundle of elongated bodies (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-75643 Summary of the Invention [Problem to be solved by the invention]

[0004] Even if the above-mentioned fire-resistant sheet material is wrapped around a long body, it is not necessarily easy to improve the fire resistance if the fire-resistant structure has a thin wall, etc. In order to improve the fire resistance, it is possible to increase the width of the fire-resistant sheet material (increase the length in the center line direction of the long body), but such a fire-resistant sheet material tends to be expensive.

[0005] The present invention has been made in view of the above points, and has an object to improve fire resistance while keeping costs low. [Means for solving the problem]

[0006] To achieve the above objectives, The present invention provides A fire-resistant structure in which a thermally expandable member that expands due to heat during a fire is provided between an inner peripheral surface of a through-hole formed in a partition of a building and an outer peripheral surface of a refrigerant pipe of an air conditioning device inserted into the through-hole, a sleeve inserted into the through hole; a strip-shaped first fireproof sheet wrapped around the outer peripheral surface of the refrigerant pipe; a belt-shaped second fireproof sheet wound around the outer peripheral surface of the refrigerant pipe so as to be adjacent to the first fireproof sheet in the center line direction of the refrigerant pipe; a filler provided between the first and second fireproof sheets and the inner circumferential surface of the sleeve; Equipped with The first and second fire-resistant sheets are each characterized in that the thermal expansion member is provided on a strip-shaped base material, and the thermal expansion member is wrapped around the refrigerant piping with the thermal expansion member facing the refrigerant piping side.

[0007] This makes it possible to easily increase the fire resistance by lengthening the portion of the elongated body that is covered with the fireproof sheet without using a wide fireproof sheet. [Effects of the Invention]

[0008] The present invention makes it easy to improve fire resistance while keeping costs low. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a plan view of a fireproof sheet placed with the side on which the thermal expansion member is provided facing upward. [Figure 2] A bottom view of the fireproof sheet with the side on which the thermal expansion member is provided facing upward. [Figure 3] A side view of a fireproof sheet placed with the side on which the thermal expansion member is provided facing upward. [Figure 4] Vertical cross section of fire-resistant structure DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the following description of the preferred embodiment is essentially merely an example and is not intended to limit the present invention, its applications, or its uses. Furthermore, the numerical values ​​such as dimensions shown below are merely examples and are not intended to be limiting.

[0011] (Configuration of fire-resistant sheet 100) 1 to 3 show the structure of a fire-resistant sheet 100 used in a fire-resistant structure according to an embodiment of the present invention. This fire-resistant sheet 100 is composed of a strip-shaped substrate 101, for example, made of aluminum glass cloth, and a thermally expandable member 102 that expands due to heat during a fire, provided on one side of the substrate. The fire-resistant sheet 100 is formed in a strip shape, for example, 150 mm wide (A) and 1200 mm long (B), and is cut to a predetermined length before use. The thermally expandable member 102 is provided at one widthwise edge 101a of the substrate 101 (the edge on one side along the centerline of the refrigerant pipe 210 when the substrate 101 is wrapped around the refrigerant pipe 210, as described below) so that the edges of the thermally expandable member 102 are flush with each other. Meanwhile, a substrate-exposed region 101c with a width of 25 mm (C) and no thermally expandable member 102 is formed at the other side edge 101b opposite the one side edge 101a. That is, the width of the thermally expandable member 102 is set to 125 mm (D). Although not essential, the base material 101 of the fire-resistant sheet 100 is also printed with linear markings, such as a blue wall reference line 103 and a red floor reference line 104, which serve as positioning references when installing the sheet on a wall or floor, as will be described later, at a position 105 mm (E) or 73 mm (F) from one side edge 101 a.

[0012] The thermal expansion member 102 may be any thermal expansion member used in buildings, and the type is not particularly limited, but examples include materials that expand due to heat during a fire. For example, a compound of expandable graphite and boric acid can be used. This expandable graphite can expand, for example, by 100 times or more when heated by a flame. The form of the thermal expansion member 102 is not particularly limited, but it can be, for example, a putty-like or paste-like material that does not drip for a long period of time. Preferably, the thermal expansion member 102 is formed into a tape-like shape several millimeters thick, and is preferably flexible enough to bend when an external force is applied.

[0013] The thermally expandable member 102 having such properties can be obtained by, for example, mixing flexible rubber or thermoplastic elastomer with expandable graphite, borax, plasticizer, etc. Examples of rubber include natural rubber, isoprene rubber, butadiene rubber, and acrylic rubber. Examples of thermoplastic elastomers include styrene-based thermoplastic elastomers and olefin-based thermoplastic elastomers. Furthermore, the thermally expandable member 102 is preferably a butyl rubber sealant having a thickness of 2 to 8 mm (4 mm is preferred) and containing expandable graphite.

[0014] (Fireproof structure) Fig. 4 shows a fire-resistant structure according to an embodiment of the present invention, where the dimensions of the fire-resistant sheet 100 in particular in the thickness direction are exaggerated for convenience of illustration.

[0015] The fire-resistant sheet 100 is used by being placed between the inner peripheral surface of a through-hole 200a formed in a partition 200, such as a so-called thin wall (e.g., having a thickness of about 42 mm or more) such as one wall of a building, such as an apartment building, and the outer peripheral surface of a refrigerant pipe 210 of an air conditioner that is inserted through the through-hole 200a. Here, the object that is inserted through the through-hole 200a is not limited to the refrigerant pipe 210 alone, but a water pipe, an electric wiring, or the like may also be inserted.

[0016] More specifically, a sleeve 220 made of, for example, steel is fitted into the through hole 200a of the partition section 200, while a fire-resistant sheet 100 is wrapped around the refrigerant pipe 210, and a filler 230 such as a heat insulating material, such as glass wool or rock wool, is filled between the inner surface of the sleeve 220 and the outer surface of the fire-resistant sheet 100.

[0017] The partition 200 may be, for example, a fire-resistant wall made of reinforced gypsum board or ALC (lightweight aerated concrete), but is not limited thereto and may also be a floor. In the example shown in FIG. 4, the partition 200 is composed of two reinforced gypsum boards, each of which has a thickness of approximately 21 mm (42 mm (G) for the two boards). By disposing the fire-resistant sheet 100 between the inner circumferential surface of the through-hole 200a and the outer circumferential surface of the refrigerant pipe 210, the spread of fire through the through-hole 200a in the event of a fire can be suppressed. The partition 200 extends vertically, with one room R1 to the left of the partition 200 in FIG. 4 and the other room R2 to the right of the partition 200 in FIG. 4. Therefore, the partition 200 separates the one room R1 from the other room R2. A through-hole 200a is formed in a predetermined position of the partition 200, penetrating the horizontal direction. One chamber R1 and the other chamber R2 can communicate with each other via the through-hole 200a. The through-hole 200a has a substantially circular cross section.

[0018] The sleeve 220 is set to have a length of, for example, 105 mm (H), and is arranged so that the end face on the room R1 side is flush with the surface of the partition section 200.

[0019] Two fire-resistant sheets 100, a first fire-resistant sheet 100' and a second fire-resistant sheet 100", are wrapped around the outer peripheral surface of the refrigerant pipe 210, etc., with their respective thermally expandable members 102 adjacent to each other in the direction of the center line of the refrigerant pipe 210. More specifically, the first fire-resistant sheet 100' is wrapped so that one side edge 101a is positioned 20 mm (I) from the end face of the sleeve 220 on the room R1 side. The second fire-resistant sheet 100" is wrapped so that the substrate 101 of the substrate exposed region 101c covers the one side edge 101a of the first fire-resistant sheet 100'. The positioning can be easily performed by aligning the wall reference line 103 provided on the fire-resistant sheet 100 as described above with the end face of the sleeve 220 on the room R1 side. These first fire-resistant sheet 100' and second fire-resistant sheet 100" are prevented from unwinding or separating from each other by, for example, non-flammable aluminum tape (not shown) having an adhesive layer on a base material having aluminum foil. On the other hand, the thermally expandable member 102 of these first fire-resistant sheet 100' and second fire-resistant sheet 100" is arranged to be slidable relative to the refrigerant piping 210.

[0020] With the above-described fire-resistant structure, it is easy to increase the fire resistance performance by lengthening the portion of the elongated body that is covered by the fire-resistant sheet without using a wide fire-resistant sheet. Therefore, for example, if a fire breaks out in one room R1, the heat is less likely to be transmitted to room R2, and costs can easily be kept low.

[0021] Furthermore, since the thermally expandable members 102 of the first fire-resistant sheet 100' and the second fire-resistant sheet 100" are arranged to be slidable relative to the refrigerant piping 210, even if the refrigerant piping 210 expands and contracts in response to changes in the operating state, such as when the air conditioning unit starts or stops operating, the first fire-resistant sheet 100' and the second fire-resistant sheet 100" are less likely to slip relative to the partition section 200, and therefore falling off can be easily prevented.

[0022] Furthermore, since the second fire-resistant sheet 100" is arranged so that the substrate 101 in the substrate exposed region 101c covers one side edge portion 101a of the first fire-resistant sheet 100', the two fire-resistant sheets 100, the first fire-resistant sheet 100' and the second fire-resistant sheet 100", can be easily wrapped around the refrigerant pipe 210 so that their respective thermally expandable members 102 are arranged adjacent to each other in the center line direction of the refrigerant pipe 210.

[0023] Furthermore, by providing the first fire-resistant sheet 100' and the second fire-resistant sheet 100" adjacent to each other as described above, it is possible to easily improve the fire resistance performance even in a single-wall compartment 200. In other words, even without using a particularly wide fire-resistant sheet 100, it is possible to easily reduce costs by using a fire-resistant sheet 100 that is used in, for example, hollow walls.

[0024] Furthermore, by providing wall reference lines 103 and floor reference lines 104 on the fireproof sheet 100, the positioning work can be made easier. [Explanation of symbols]

[0025] 100 Fireproof Sheet 100' First Fireproof Sheet 100" Secondary Fireproof Sheet 101 Base material 101a One side edge 101b Other side edge 101c Base material exposed area 102 Thermal expansion member 103 Wall reference line 104 Floor reference line 200 compartment 200a through hole 210 Refrigerant piping 220 Sleeve 230 Filling material

Claims

1. A fire-resistant structure in which a thermally expandable member that expands due to heat during a fire is provided between an inner peripheral surface of a through-hole formed in a partition of a building and an outer peripheral surface of a refrigerant pipe of an air conditioning device inserted into the through-hole, a sleeve inserted into the through hole; a strip-shaped first fireproof sheet wrapped around the outer peripheral surface of the refrigerant pipe; a band-shaped second fireproof sheet wound around the outer peripheral surface of the refrigerant pipe so as to be adjacent to the first fireproof sheet in a center line direction of the refrigerant pipe; a filler provided between the first and second fire-resistant sheets and the inner circumferential surface of the sleeve; Equipped with A fire-resistant structure characterized in that the first and second fire-resistant sheets are each formed by providing the thermal expansion member on a strip-shaped base material, and the thermal expansion member is wrapped around the refrigerant piping with the refrigerant piping side facing the refrigerant piping.

2. The fire-resistant structure of claim 1, The fire-resistant structure is characterized in that the thermal expansion member is provided slidably relative to the refrigerant pipe.

3. The fire-resistant structure of claim 1, A fire-resistant structure characterized in that the first fire-resistant sheet has a substrate exposed area where the thermal expansion member is not provided at one edge of the band in the center line direction of the refrigerant pipe, and the substrate exposed area is arranged so as to overlap the thermal expansion member in the second fire-resistant sheet.

4. The fire-resistant structure of claim 1, A fire-resistant structure in which the compartments of the building are thin-walled.

5. The fire-resistant structure of claim 1, A fire-resistant structure characterized in that a linear marking is provided on the first or second fire-resistant sheet at a position corresponding to the end face of the sleeve.

6. A fire-resistant sheet which is at least one of the first fire-resistant sheet and the second fire-resistant sheet used in the fire-resistant structure of claim 3, The thermal expansion member is provided on the band-shaped base material, A fire-resistant sheet characterized in that a base material exposed region where the thermal expansion member is not provided is formed at an edge portion on one side of the band in the center line direction of the refrigerant pipe.

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