Fireproof sheet

Abstract

A fireproof sheet is provided that ensures fire resistance by wrapping it around the outer periphery of a flammable pipe and improves adhesion to the flammable pipe. [Solution] A fire-resistant sheet (10) is used by wrapping it around the outer peripheral surface of a flammable pipe, and comprises: a first aluminum foil (12) having a baked coating layer (11) of synthetic resin paint on one side; a first glass cloth layer (13) adhered to the other side of the first aluminum foil (12); a fibrous fire-resistant adhesive layer (15) formed on the other side of the first glass cloth layer (13) and made of baked and carbonized acrylic fiber fabric impregnated with adhesive; and a non-flammable fiber layer (20) laminated at a position on the other side of the fibrous fire-resistant adhesive layer (15) and coming into contact with the outer peripheral surface of the flammable pipe when the fire-resistant sheet (10) is wrapped around the flammable pipe.

Description

[Technical Field]

[0001] This invention relates to a fireproof sheet that is wrapped around the outer surface of flammable pipes. [Background technology]

[0002] 2. Description of the Related Art Conventionally, a known fire-resistant piping is a double-layered fire-resistant pipe in which a non-fire-resistant inner pipe such as a hard PVC pipe is laminated with a fire-resistant outer pipe such as fiber mortar. Patent Document 1 discloses a tape-shaped joint for connecting two-layer fireproof pipes that is wrapped around the outer periphery of the joint at the connection point where a two-layer fireproof pipe is connected to a two-layer fireproof pipe fitting. By wrapping this joint around the outer periphery of the joint at the connection point, it is possible to block the heat that acts on the two-layer fireproof pipe in the event of a fire from affecting the inner pipe through the joint. Furthermore, in order to prevent a decrease in adhesive strength due to hardening and to adhere the two-layer fireproof pipe to the outer pipe over a long period of time, an adhesive such as an acrylic adhesive is applied to the surface that comes into contact with the outer pipe. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 3118355 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the tape-shaped joint for connecting two-layer fire-resistant pipes in Patent Document 1 is intended to be used at the joint between a two-layer fire-resistant pipe that has already been fire-resistant and a two-layer fire-resistant pipe joint that has already been fire-resistant. Therefore, even if this tape-shaped joint for connecting two-layer fire-resistant pipes is wrapped around the outer surface of a flammable pipe that has not been fire-resistant, there is a risk that sufficient fire resistance cannot be ensured.

[0005] Additionally, accordion-shaped flexible pipes made of synthetic resin are known as flammable piping. Because flexible pipes can be bent freely according to the installation location, it is difficult to create fire-resistant piping by pre-laminating an outer pipe made of fiber mortar or the like around the flexible pipe. Furthermore, even if the tape-shaped fire-resistant double-layer pipe connection joint described in Patent Document 1 is wrapped around the flexible pipe, it is not possible to ensure sufficient fire resistance, as described above. Furthermore, since the tape can only contact the convex portions of the concave and convex portions formed on the flexible pipe's outer periphery, there is a risk that adhesion will be poor and sufficient adhesive strength will not be ensured.

[0006] The present invention was made in consideration of the problems mentioned above, and aims to ensure fire resistance by wrapping it around the outer surface of flammable pipes that are not fire-resistant, while also improving adhesion to the flammable pipes. [Means for solving the problem]

[0007] The present invention is a fire-resistant sheet that is wrapped around the outer surface of a flammable pipe, and is characterized by comprising: an aluminum foil; a glass cloth layer that is adhered to the other side of the aluminum foil; a fibrous fire-resistant adhesive layer that is attached to the other side of the glass cloth layer and is made of baked and carbonized acrylic fiber fabric impregnated with an adhesive; and a non-flammable fiber layer that is laminated at a position on the other side of the fibrous fire-resistant adhesive layer and that comes into contact with the outer surface of the flammable pipe when the fire-resistant sheet is wrapped around the flammable pipe. [Effects of the Invention]

[0008] According to the present invention, by wrapping the liner around the outer surface of a non-fireproof flammable pipe, fire resistance can be ensured and adhesion to the flammable pipe can be improved. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a perspective view showing a state before a fireproof sheet is wrapped around a flammable pipe. [Figure 2]FIG. 2 is a perspective view showing the configuration of each layer of the fire-resistant sheet. [Figure 3] FIG. 2 is a cross-sectional view showing the configuration of each layer of the fire-resistant sheet. [Figure 4] FIG. 2 is a cross-sectional view showing a portion of a fireproof sheet and a flexible pipe. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, a fire-resistant sheet 10 according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a state before a fire-resistant sheet 10 is wrapped around a flammable pipe. 1 shows a flexible pipe 1 as an example of flammable piping. The flexible pipe 1 is a flexible pipe material that can be bent freely. The flexible pipe 1 is made of a synthetic resin such as polyvinyl chloride, and is not fire-resistant.

[0011] Specifically, the flexible pipe 1 is bellows-shaped, with annular recesses 2a and annular protrusions 2b alternately formed at regular intervals on the outer circumferential surface. Two fire-resistant double-layer pipes 3 are connected to one end and the other end of the flexible pipe 1, and fastened together by fastening bands 4.

[0012] <Configuration of fire-resistant sheet 10> The fire-resistant sheet 10 can make a non-fire-resistant flexible pipe 1 fire-resistant by wrapping and fixing it around the outer periphery of the flexible pipe 1. The fire-resistant sheet 10 is a roughly rectangular sheet when unfolded, and the installer cuts it appropriately to fit the size of the flexible pipe 1. Specifically, a large piece of fire-resistant sheet is cut to a size whose width W is a predetermined length larger than the length of the flexible pipe 1 and whose length (perpendicular to the width W) is such that the ends of the fire-resistant sheet 10 overlap when wrapped around the outer periphery of the flexible pipe 1, allowing it to be wrapped sufficiently around the outer periphery of the flexible pipe 1.

[0013] The fire-resistant sheet 10 is constructed by laminating and integrating a plurality of layers. FIG. 2 is a perspective view showing the configuration of each layer of the fire-resistant sheet 10, with each layer separated. FIG. 3 is a cross-sectional view showing the configuration of each layer of the fire-resistant sheet 10. In FIGS. 2 and 3, arrows indicate the top and bottom, with the "top" side being the side (one side) that will become the surface when the fire-resistant sheet 10 is wrapped around a flammable pipe, and the "bottom" side being the side (the other side) that will come into contact with the flammable pipe when the fire-resistant sheet 10 is wrapped around the flammable pipe. FIGS. 2 and 3 correspond, for example, to the portion of the fire-resistant sheet 10 shown in FIG. 1, enclosed by the two-dot chain line A.

[0014] The fire-resistant sheet 10 of this embodiment comprises a first aluminum foil 12 having a baked coating layer 11 of synthetic resin paint on its upper surface, a first glass cloth layer 13 adhered to the lower surface of the first aluminum foil 12, a fibrous fire-resistant adhesive layer 15 formed on the lower surface of the first glass cloth layer 13 and comprising baked and carbonized acrylic fiber fabric impregnated with an adhesive, a second aluminum foil 17 provided on the lower surface of the fibrous fire-resistant adhesive layer 15 via an adhesive 16, a second glass cloth layer 18 provided on the lower surface of the second aluminum foil 17, and a non-combustible fiber layer 20 provided on the lower surface of the second glass cloth layer 18 and coming into contact with the outer surface of the flammable pipe when the fire-resistant sheet 10 is wrapped around the flammable pipe.

[0015] The baked paint layer 11 is a layer that improves the durability and functionality of the first aluminum foil 12. Specifically, by providing the baked paint layer 11 on the upper surface of the first aluminum foil 12, it is possible to prevent deterioration of the first aluminum foil 12 due to external factors such as ultraviolet rays and temperature changes. Furthermore, the baked paint layer 11 prevents corrosion of the fire-resistant sheet 10 due to rainwater or moisture, and can maintain stable performance even outdoors or in a humid environment. The baked paint layer 11 of this embodiment is a synthetic resin paint, and for example, an acrylic or melamine-based resin paint is used. Furthermore, the baked paint layer 11 of this embodiment has a thickness of 0.002 to 0.004 mm and a mass of 1.0 to 3.0 g / m, for example. 2 (solid amount).

[0016] The first aluminum foil 12 is a layer that mainly imparts fire resistance to the fire-resistant sheet 10. Specifically, the first aluminum foil 12 has high heat-shielding properties due to heat radiation reflection, and can prevent heat from penetrating into the lower layer. Furthermore, the first aluminum foil 12 has a melting point higher than the temperature of a general fire, and therefore can maintain its shape and does not burn itself, thereby preventing the spread of combustion. The first aluminum foil 12 of this embodiment has, for example, a thickness of 0.01 mm to 0.03 mm (JIS H 4160) and a mass of 50 to 60 g / m 2 (solid amount).

[0017] The first glass cloth layer 13 functions as a core material that reinforces the fire resistance of the fire-resistant sheet 10 and stabilizes the layer structure of the fire-resistant sheet 10 even when the fire-resistant sheet 10 is bent for wrapping. Specifically, the first glass cloth layer 13 is formed by plain weaving glass fiber warp threads 14a extending in the length direction of the fire-resistant sheet 10 and glass fiber weft threads 14b extending in the width direction. In the first glass cloth layer 13 of this embodiment, the number of weft threads 14b is fewer than the number of warp threads 14a, for example, 16 warp threads per square inch and 8 weft threads per square inch. Furthermore, the warp threads 14a and weft threads 14b of this embodiment are glass yarns having a nominal monofilament diameter of 11E as defined in JIS-R3414. By reducing the number of weft threads 14b compared to the number of warp threads 14a, the fire-resistant sheet 10 can be given flexibility that allows it to conform to the irregularities of the outer peripheral surface when wrapped around the outer peripheral surface of the flexible pipe 1. The first glass cloth layer 13 of the present embodiment has a thickness of 0.08 to 0.10 mm and a mass of 60 to 70 g / m 2 (solid amount). The first glass cloth layer 13 is adhered to the lower surface of the first aluminum foil 12 using an adhesive such as an acrylic acid ester copolymer resin adhesive.

[0018] The fire-resistant fiber adhesive layer 15 is a layer that reinforces the fire resistance of the fire-resistant sheet 10 and also imparts flexibility to the fire-resistant sheet 10. Specifically, the fire-resistant fiber adhesive layer 15 is formed by impregnating a baked and carbonized acrylic fiber fabric with an acrylic adhesive. By impregnating the acrylic fiber fabric with the adhesive in this way, air is removed from the fabric, resulting in a thin, fire-resistant adhesive layer. The acrylic fiber fabric used in this embodiment is, for example, an acrylic fiber fabric made of fibers of about 2.2 dtex formed into a thin felt or nonwoven fabric. The fire-resistant fiber adhesive layer 15 of this embodiment has, for example, a thickness of 0.5 to 9.0 mm and a mass of 70 to 1260 g / m 2 is. The fire-resistant fiber adhesive layer 15 is adhered to the lower surface of the first glass cloth layer 13 by the impregnated adhesive.

[0019] The adhesive 16 is a layer that adheres the second aluminum foil 17 to the lower surface of the fiber fireproof adhesive layer 15. For example, an acrylic adhesive is used as the adhesive 16. By using an acrylic adhesive as the adhesive 16, it is possible to prevent a decrease in adhesive strength due to hardening, and to stably adhere the fiber fireproof adhesive layer 15 and the second aluminum foil 17 for a long period of time.

[0020] The second aluminum foil 17 is a layer that reinforces the fire resistance of the fire-resistant sheet 10 and facilitates adhesion to the adhesive 16. Specifically, the second aluminum foil 17, like the first aluminum foil 12, can prevent heat from penetrating into the lower layer and prevent the spread of combustion. Furthermore, since the adhesive surface of the second aluminum foil 17 with the adhesive 16 is smooth, it can adhere more firmly than uneven surfaces such as the second glass cloth layer 18 and the non-combustible fiber layer 20, and the upper and lower layers can be easily integrated by sandwiching the second aluminum foil 17. The second aluminum foil 17 of this embodiment has a thickness of, for example, 0.007 to 0.02 mm (JIS H 4160).

[0021] The second glass cloth layer 18 is a layer that reinforces the fire resistance of the fire-resistant sheet 10. The second glass cloth layer 18, together with the first glass cloth layer 13, functions as a core material that stabilizes the layer structure of the fire-resistant sheet 10 even when the fire-resistant sheet 10 is bent for wrapping. Specifically, the second glass cloth layer 18 is formed by plain weaving glass fiber warp threads 19a extending in the length direction of the fire-resistant sheet 10 and glass fiber weft threads 19b extending in the width direction. The second glass cloth layer 18 of this embodiment has, for example, 16 warp threads and 15 weft threads per square inch. The warp threads 19a and weft threads 19b of this embodiment are made of glass yarns having a nominal monofilament diameter of 11E as defined in JIS-R3414. The second glass cloth layer 18 of this embodiment has, for example, a thickness of 0.08 to 0.21 mm. The second glass cloth layer 18 is adhered to the lower surface of the second aluminum foil 17 using an adhesive such as an acrylic acid ester copolymer resin adhesive.

[0022] The noncombustible fiber layer 20 reinforces the fire resistance of the fire-resistant sheet 10 and is a layer that adheres closely to the outer surface of the flammable pipe when the fire-resistant sheet 10 is wrapped around and in contact with the flammable pipe. Specifically, the noncombustible fiber layer 20 is made of rock wool formed into a felt-like material. Rock wool is heat-resistant because it is made from blast furnace slag and ore, and because it contains countless air spaces between the fine fibers, it is flexible, thermally insulating, and sound-proof.

[0023] Because the noncombustible fiber layer 20 has flexibility, when the fire-resistant sheet 10 is wrapped around the outer peripheral surface of the flexible pipe 1, the noncombustible fiber layer 20 deforms to follow the shapes of the recesses 2a and protrusions 2b on the outer peripheral surface of the flexible pipe 1, thereby adhering closely to the outer peripheral surface of the flexible pipe 1. The noncombustible fiber layer 20 of this embodiment has a thickness of 25.0 to 50.0 mm and a mass of 40 to 70 kg / m, for example. 3That is, the thickness of the noncombustible fiber layer 20 is greater than the thickness of any of the layers constituting the fire-resistant sheet 10. In this embodiment, the ratio of the thickness of the noncombustible fiber layer 20 to the overall thickness of the fire-resistant sheet 10 is, for example, 70% to 96%. Increasing the thickness of the noncombustible fiber layer 20 in this way not only improves the fire resistance of the flammable pipe, but also makes it easier for the noncombustible fiber layer 20 to deform to follow the shapes of the recesses 2a and protrusions 2b on the outer peripheral surface of the flexible pipe 1. The non-combustible fiber layer 20 is bonded to the lower surface of the second glass cloth layer 18 using an adhesive such as an acrylic acid ester copolymer resin adhesive.

[0024] Next, a method for wrapping the fire-resistant sheet 10 configured as described above around the flexible pipe 1 will be described. The installer positions the noncombustible fiber layer 20 of the fire-resistant sheet 10, cut to the size of the flexible pipe 1, facing the outer peripheral surface of the flexible pipe 1, so that the center of the fire-resistant sheet 10 in the width direction W is approximately the same as the center of the fire-resistant sheet 1 in the length direction. At this time, the fire-resistant sheet 10 protrudes from both sides of the flexible pipe 1, with a portion reaching the double-layer fire-resistant pipe 3. From this state, the installer presses the noncombustible fiber layer 20 of the fire-resistant sheet 10 against the outer peripheral surface of the flexible pipe 1, and wraps the fire-resistant sheet 10 around the outer peripheral surface of the flexible pipe 1. At this time, the fiber fire-resistant adhesive layer 15 and the noncombustible fiber layer 20 are flexible, while the first glass cloth layer 13 and the second glass cloth layer 18 stabilize the layer structure. This allows the fire-resistant sheet 10 to be easily bent while maintaining its shape appropriately, improving the workability of the fire-resistant sheet 10.

[0025] Next, the installer attaches the above-mentioned tape-shaped joint for connecting a double-layered fire-resistant pipe along the overlapping portions of the ends of the wrapped fire-resistant sheet 10. Finally, the installer completes the installation by attaching the tape-shaped joint for connecting a double-layered fire-resistant pipe circumferentially to both ends of the fire-resistant sheet 10 so that they each straddle the double-layered fire-resistant pipe 3. Note that if there are any areas of the fire-resistant sheet 10 where the noncombustible fiber layer 20 is protruding and exposed, these are sealed using the tape-shaped joint for connecting a double-layered fire-resistant pipe.

[0026] By wrapping the fire-resistant sheet 10 around the outer surface of the flexible pipe 1 in this manner, the fire resistance of the flexible pipe 1 can be ensured by the fire-resistant functions of each of the first aluminum foil 12, first glass cloth layer 13, fiber fire-resistant adhesive layer 15, second aluminum foil 17, second glass cloth layer 18 and non-flammable fiber layer 20 that make up the fire-resistant sheet 10.

[0027] FIG. 4 is a cross-sectional view of a portion of the fire-resistant sheet 10 wrapped around the outer peripheral surface of the flexible pipe 1 and a portion of the flexible pipe 1. As shown in FIG. 4, the non-combustible fiber layer 20 of the fire-resistant sheet 10 deforms to conform to the shape of the outer peripheral surface of the flexible pipe 1. Specifically, the non-combustible fiber layer 20 deforms to conform to the shape of the convex portion 2b of the flexible pipe 1 at a position facing the convex portion 2b, and deforms to conform to the shape of the concave portion 2a at a position facing the concave portion 2a, and enters the concave portion 2a. This prevents gaps from forming between the fire-resistant sheet 10 and the flexible pipe 1, thereby improving adhesion to the flexible pipe 1. In this way, the fire-resistant sheet 10 can be wrapped around the flexible pipe 1 in a tightly adhered state, allowing the fire-resistant sheet 10 to remain wrapped around the flexible pipe 1 for a long period of time without coming off.

[0028] Since the thickness of the noncombustible fiber layer 20 is greater than the thickness of any of the layers constituting the fire-resistant sheet 10, deformation of the noncombustible fiber layer 20 is contained within the noncombustible fiber layer 20 and is prevented from propagating to other layers. However, depending on the gap between the convex portions 2b of the flexible pipe 1, deformation of the noncombustible fiber layer 20 may become so large that the deformation propagates to other layers. Even in such a case, the first glass cloth layer 13 and the second glass cloth layer 18 of the fire-resistant sheet 10 follow the deformation of the noncombustible fiber layer 20, thereby preventing peeling between the layers.

[0029] Furthermore, by using rock wool for the noncombustible fiber layer 20, the fire-resistant sheet 10 can be produced at low cost. Furthermore, by using rock wool for the noncombustible fiber layer 20, flexibility, heat insulation, and soundproofing properties can be imparted in addition to heat resistance. Furthermore, rock wool has a structure in which the fibers are randomly intertwined, and therefore, when combined with an air layer, it exhibits excellent sound absorption properties. Therefore, by wrapping the fire-resistant sheet 10 around, for example, a drainage pipe, it is possible to reduce the vibration noise caused by drainage.

[0030] Although the present invention has been described above with reference to the above-described embodiments, the present invention is not limited to the above-described embodiments and can be modified within the scope of the present invention. The values ​​of thickness, mass, and the like, and materials, etc. described in the above-described embodiment are merely examples and can be changed as appropriate.

[0031] The fire-resistant sheet 10 of the above-described embodiment has been described as having the second aluminum foil 17 provided on the lower surface of the fiber fire-resistant adhesive layer 15 via the adhesive 16, and the second glass cloth layer 18 provided on the lower surface of the second aluminum foil 17, but is not limited to this. For example, at least one of the second aluminum foil 17 and the second glass cloth layer 18 may be eliminated, or at least one of the second aluminum foil 17 and the second glass cloth layer 18 may be replaced with a layer of another material.

[0032] In addition, although the non-combustible fiber layer 20 of the fire-resistant sheet 10 in the above-described embodiment is made of rock wool in a felted form, the present invention is not limited to this. Glass wool, ceramic fiber, or the like may also be used as the non-combustible fiber layer 20. [Explanation of symbols]

[0033] 1: Flexible pipe (flammable piping) 10: Fireproof sheet 11: Baked paint layer 12: First aluminum foil 13: First glass cloth layer 15: Fiber fireproof adhesive layer 16: Adhesive 17: Second aluminum foil 18: Second glass cloth layer 20: Non-flammable fiber layer

Claims

1. A fireproof sheet used by wrapping it around the outer periphery of a flammable pipe, an aluminum foil; a glass cloth layer bonded to the other surface of the aluminum foil; and a fiber fireproof adhesive layer formed on the other surface of the glass cloth layer, the fiber fireproof adhesive layer being made by impregnating a baked and carbonized acrylic fiber fabric with an adhesive; A fire-resistant sheet characterized by having a non-flammable fiber layer laminated at a position on the other side of the fiber fire-resistant adhesive layer and in contact with the outer surface of the flammable pipe when the fire-resistant sheet is wrapped around the flammable pipe.

2. When the aluminum foil is a first aluminum foil and the glass cloth layer is a first glass cloth layer, A second aluminum foil adhered to the other surface of the fiber fire-resistant adhesive layer; A second glass cloth layer provided on the other side of the second aluminum foil, The non-flammable fiber layer is 2. The fire-resistant sheet according to claim 1, wherein the second glass cloth layer is laminated on the other side of the second glass cloth layer.

3. The non-combustible fiber layer is formed by molding rock wool into a felt-like shape, 3. The fire-resistant sheet according to claim 1, wherein the thickness of the fire-resistant sheet is greater than the thickness of any of the layers constituting the fire-resistant sheet.

Images