JP7493886B2 - Heat-expandable fire-resistant sheet, fireproofing method for penetration part using heat-expandable fire-resistant sheet, and fireproof structure for penetration part using heat-expandable fire-resistant sheet - Google Patents

Description

The present invention relates to a heat-expandable fire-resistant sheet that expands thermally in the event of a fire to provide insulation and fire resistance. The present invention also relates to a method for fireproofing a penetration part of a building using the heat-expandable fire-resistant sheet.

When creating fire compartments in a building, penetrations, i.e. holes that penetrate the partition walls, are sometimes made in the partition walls of the fire compartment for the purpose of passing cables through, ventilation, etc. In the event of a fire, air (oxygen) is supplied and flames spread through the penetrations, so the penetrations are fireproofed so that they can be closed in the event of a fire.

If a heat-expandable fireproof sheet is used for fireproofing the penetration part, the fireproofing (construction) becomes simple and convenient.
For example, Patent Document 1 discloses a technology for fireproofing a penetrating object such as a cable by wrapping a tape-like fireproofing member, which is made by laminating a sheet material made of a heat-expandable fire-resistant material and a urethane foam, which is a resin foam, around the object and placing it inside a through hole. It is disclosed that this processing method provides a construction method for a fire compartment penetration that is easy to construct while reducing costs.

JP 2005-351305 A

Fireproofing of fire compartment penetrations requires fire resistance that can withstand flames and hot air for as long as possible. In addition, fireproofing of fire compartment penetrations requires the ability to completely seal the penetrations and block the flow of smoke and air.

However, it was difficult to meet both of these requirements with conventional heat-expandable fire-resistant materials. In other words, to improve fire resistance that can withstand flames and hot air for a long period of time, it is desirable to make the expanded fire-resistant material relatively hard, but such fire-resistant materials tend to have a low expansion ratio, which tends to reduce their ability to reliably close penetrations.

The object of the present invention is to provide a heat-expandable fire-resistant sheet that is easy to install and has flexibility that allows it to be wound multiple times or more, thereby blocking a penetration part for a long time in the event of a fire. Another object of the present invention is to provide a fire-proofing method for a penetration part using such a heat-expandable fire-resistant sheet that has flexibility that allows it to be wound multiple times or more .

After extensive research, the inventor discovered that by using multiple heat-expandable fire-resistant materials with different degrees of shape retention after expansion to construct a heat-expandable fire-resistant sheet in such a way that band-shaped regions made of these materials are arranged side by side, it is possible to achieve both long-term fire resistance to flames and hot air and reliable sealing of the penetrations, and thus completed the present invention.

The present invention provides a heat-expandable fire-resistant sheet having flexibility allowing it to be wound multiple times or more , in which, when viewed perpendicular to the surface of the sheet, a first band-shaped region made of a first fire-resistant material and a second band-shaped region made of a second fire-resistant material are integrally arranged side by side, and both the first fire-resistant material and the second fire-resistant material are heat-expandable fire-resistant resin compositions, and the first fire-resistant material has a higher shape retention after expansion than the second fire-resistant material (first invention).

In the first invention, preferably, a third band region made of the first refractory material is further provided, and the second band region is disposed integrally between the first and third band regions (invention 2). In the first or second invention, preferably, the first refractory material contains aluminum phosphite (invention 3). In the third invention, preferably, the first and second refractory materials contain thermally expandable graphite (invention 4).

The present invention also relates to a fireproofing method for a penetration part using a heat-expandable fireproof sheet of the first invention that has flexibility allowing it to be wound multiple times or more , in which the heat-expandable fireproof sheet is rolled into a cylindrical shape so that the first band-like region extends in the circumferential direction, and the heat-expandable fireproof sheet rolled into a cylindrical shape is placed in the hole of the penetration part so that the first band-like region is located on the side where a fire is predicted to break out (fifth invention).
The present invention also relates to a fire-resistant structure for a penetration part using a heat-expandable fire-resistant sheet of the first invention that has flexibility allowing it to be wound multiple times or more , in which the heat-expandable fire-resistant sheet is rolled into a cylindrical shape so that the first band-shaped region extends in the circumferential direction, and is arranged in the hole of the penetration part so that the first band-shaped region is located on the side where a fire is predicted to break out (sixth invention).

According to the heat-expandable fire-resistant sheet of the present invention (first invention) which is flexible enough to be wound multiple times or more, the fire-resistant treatment method for a penetration part of the present invention (fifth invention), and the fire-resistant structure of a penetration part of the present invention (sixth invention), the application of fire-resistant treatment is simple, and the effect of blocking the penetration part for a long period of time in the event of a fire is obtained.
Furthermore, in the case of the second aspect of the invention, the construction becomes easier and the reliability of the fireproofing treatment is improved. In addition, in the case of the third or fourth aspect of the invention, the reliability of the fireproofing treatment is particularly improved.

FIG. 2 is a plan view showing the structure of the thermally expandable fireproof sheet of the first embodiment. FIG. 2 is a cross-sectional view showing the structure of the thermally expandable fireproof sheet of the first embodiment. 1A to 1C are diagrams showing a method of installing the thermally expandable fireproof sheet of the first embodiment. 5A and 5B are a plan view and a cross-sectional view showing the structure of a thermally expandable fireproof sheet of a second embodiment. FIG. 11 is a cross-sectional view showing the structure of a thermally expandable fireproof sheet according to a third embodiment.

The following describes an embodiment of the invention with reference to the drawings, taking as an example a thermally expandable fireproof sheet used for fireproofing a penetration part of a fire compartment. The invention is not limited to the individual embodiments shown below, and can be practiced by modifying the form.

Figures 1 and 2 are a plan view and a cross-sectional view showing the configuration of the heat-expandable fire-resistant sheet 1 of the first embodiment. Although not required, the heat-expandable fire-resistant sheet 1 of the first embodiment is in the form of a tape, and in Figure 1, the vertical direction of the figure is the longitudinal direction of the tape, and the horizontal direction of the figure is the width direction of the tape.

In the heat-expandable fire-resistant sheet 1 of the first embodiment, a first band-like region 11 made of a first fire-resistant material and a second band-like region 12 made of a second fire-resistant material are provided side by side when viewed from the direction perpendicular to the surface of the sheet, as in Fig. 1. In the case of a tape-shaped heat-expandable fire-resistant sheet as in this embodiment, it is preferable that the first band-like region 11 and the second band-like region 12 are provided integrally so as to extend in the longitudinal direction of the tape.

Although not essential, as in this embodiment, it is preferable that the heat-expandable fire-resistant sheet 1 is provided with a third band-like region 13 made of the first fire-resistant material when viewed from the direction perpendicular to the surface of the sheet, and the second band-like region 12 is disposed integrally between the first band-like region 11 and the third band-like region 13. Note that, as in the embodiment described later, the heat-expandable fire-resistant sheet does not necessarily have to be provided with the third band-like region 13.

2, when the third band region 13 made of the first fire-resistant material is provided, it is preferable that the first band region 11 and the third band region 13 are connected to each other by the first fire-resistant material and formed into a flat U-shape, as in this embodiment, and the second band region 12 made of the second fire-resistant material is provided integrally so as to fill the space of the U-shape. In this way, a layer made of another fire-resistant material may be laminated on the back side of each band region when viewed from the direction perpendicular to the sheet surface.

The first fire-resistant material and the second fire-resistant material are both thermally expandable fire-resistant resin compositions. Thermally expandable fire-resistant resin compositions are resin compositions in which an expanding agent is blended into a base resin, and when exposed to flames, hot air, or other hot air during a fire, the resin composition expands and carbonizes when the temperature of the resin composition rises, thereby exhibiting fire resistance.

The first refractory material has a higher shape retention after expansion than the second refractory material. In other words, the composition of the first refractory material that expands and carbonizes when heated is harder, less likely to crumble, and more solidly carbonized than the second refractory material.

In addition, although not essential, it is preferable that the first fire-resistant material has a lower expansion ratio when heated than the second fire-resistant material. A low expansion ratio also contributes to improving the shape retention after expansion. Typically, the expansion ratio of the first fire-resistant material is 15 to 30 times, and the expansion ratio of the second fire-resistant material is 30 to 60 times, and it is preferable that the ratio of the expansion ratios of the two, i.e., (expansion ratio of the second fire-resistant material)/(expansion ratio of the first fire-resistant material), is 1.5 to 2.5. Note that the expansion ratio here is the ratio (VA/VB) of the volume (VA) after expansion to the volume (VB) before expansion of the thermally expandable fire-resistant resin composition.

Furthermore, it is preferable that the first fire-resistant material contains aluminum phosphite. When aluminum phosphite is contained in a thermally expandable fire-resistant resin composition, the composition that expands and carbonizes when heated can be made harder, less likely to crumble, and more solid. It is preferable that 20 to 55 parts by weight of aluminum phosphite is blended in the first fire-resistant material per 100 parts by weight of the base resin component. Note that the second fire-resistant material may contain aluminum phosphite, but it is preferable that the content is less than that of the first fire-resistant material, or that the second fire-resistant material does not contain aluminum phosphite.

Aluminum phosphite may be any aluminum phosphite, and its composition is not particularly limited. When used in the present invention, aluminum phosphite may contain precursors or derivatives, such as phosphonates or hydrates. Aluminum phosphite with high foaming properties is preferred, and is sold by Taihei Chemical Industry Co., Ltd., for example. Among these, aluminum phosphite with a foaming start temperature of 380°C to 480°C and an expansion coefficient of about 10 to 70 times is preferred.

Furthermore, it is preferable that the first fire-resistant material and the second fire-resistant material contain thermally expandable graphite. Thermally expandable graphite has high expandability, and is quickly carbonized after the composition expands, and is rich in fire resistance and heat insulation. In the first fire-resistant material, it is preferable that 20 to 55 parts by weight of thermally expandable graphite is blended with 100 parts by weight of the base resin. In the second fire-resistant material, it is preferable that 30 to 100 parts by weight of thermally expandable graphite is blended with 100 parts by weight of the base resin.

Here, thermally expandable graphite generally refers to graphite that contains layered graphite crystals and pyrolysis components, and has the property of expanding rapidly when heated. When thermally expandable graphite is heated, for example by exposure to a flame, the pyrolysis components gasify, pushing apart the layers of the graphite crystals, causing the graphite to expand. Such thermally expandable graphite can be commercially available, and is not particularly limited, but examples that can be used include the "TEG" series from Air Water Inc. and the "GREP-EG" series from Suzuhiro Chemical.

The materials constituting the thermally expandable fire-resistant resin composition that becomes the first fire-resistant material and the second fire-resistant material will be described in more detail below.
The resin (base resin) that is the base of the fire-resistant resin composition is not particularly limited, and resins such as thermoplastic resins, thermosetting resins, and rubber can be used. The base resin is preferably a flame-retardant resin (for example, vinyl chloride resin, urethane resin, fluororesin, etc.). A combination of multiple resins may be used. If a thermoplastic resin (particularly vinyl chloride resin, polyurethane resin, or ethylene vinyl acetate resin) is used as the base resin, it is easy to knead compounding agents such as an expanding agent into a sheet shape and to increase the expansion ratio. In addition, if a thermosetting resin (particularly a phenolic resin) is included in the base resin, the resin component will tend to harden when heated by a fire, making the composition harder, less likely to crumble, and more solid when expanded and carbonized. The base resin of the first fire-resistant material and the base resin of the second fire-resistant material may be the same resin, or different resins.

The expanding agent contained in the fire-resistant resin composition is not particularly limited, but thermally expandable graphite, aluminum phosphite, etc. are preferred. In order to aid expansion, a thickener such as titanium oxide may be contained in the fire-resistant resin composition together with the expanding agent.

The heat-expandable fire-resistant resin composition may contain rubber and plasticizers so that the heat-expandable fire-resistant sheet has appropriate flexibility and is easy to apply.

The fire-resistant resin composition may contain a flame retardant, such as ammonium polyphosphate or a halogen-based flame retardant. The fire-resistant resin composition may also contain a carbonizing material, such as a polyhydric alcohol such as pentaerythritol. The fire-resistant resin composition may also contain an inorganic filler, such as boric acid, aluminum oxide, zinc oxide, etc. As the inorganic filler, a hydrous inorganic substance or a metal carbonate is preferred.

The fire-resistant resin composition may also contain other additives, such as antioxidants, antistatic agents, stabilizers, crosslinking agents, lubricants, pigments, and UV absorbers, as necessary.

Although not required, for example, in this embodiment, the first fire-resistant material is a heat-expandable fire-resistant resin composition in which 100 parts by weight of thermoplastic polyurethane resin is blended with 33 parts by weight of heat-expandable graphite and 33 parts by weight of aluminum phosphite. The second fire-resistant material is a heat-expandable fire-resistant resin composition in which 100 parts by weight of thermoplastic polyurethane resin is blended with 55 parts by weight of heat-expandable graphite. When heated to 450°C, the expansion ratio of the first fire-resistant material is 25 times, and the expansion ratio of the second fire-resistant material is 50 times, and the ratio of the expansion ratios of the two is 2.0.

In order to improve the shape retention of the first and second refractory materials after expansion, it is possible to increase the amount of aluminum phosphite or decrease the amount of thermally expandable graphite, although this is not essential. The amount of flame retardant, carbonizing agent, inorganic filler, etc. may be adjusted to adjust the shape retention of the refractory materials after expansion. In addition, in order to increase the expansion ratio of the first and second refractory materials, it is possible to increase the amount of thermally expandable graphite.

The thermally expandable fireproof sheet of the above embodiment can be manufactured by applying a known manufacturing method. The manufacturing process will be exemplified below.
First, a predetermined base resin and other ingredients are mixed in order to prepare a first fire-resistant material and a second fire-resistant material, respectively.

The obtained first fire-resistant material is processed into a tape shape so as to have a flat U-shaped cross section as shown in FIG. 2. Meanwhile, the second fire-resistant material is processed into a tape shape of a predetermined width. This processing may be extrusion molding or roll processing. The tape of the first fire-resistant material and the tape of the second fire-resistant material are then overlapped and integrated to obtain the thermally expandable fire-resistant sheet of the first embodiment. The tape of the first fire-resistant material and the tape of the second fire-resistant material may be integrated by thermal fusion, but they may also be integrated using an adhesive or pressure-sensitive adhesive. The first fire-resistant material and the second fire-resistant material may also be co-extruded to produce the thermally expandable fire-resistant sheet 1 of the first embodiment.

The thermally expandable fire-resistant sheet 1 of the first embodiment is used for fireproofing a penetration (through hole) provided in a wall surface of a fire compartment. Figure 3 shows an example of a method for installing the thermally expandable fire-resistant sheet 1. In this example of the installation method, a cable C is inserted through a through hole H provided in a wall surface W, and this part is used as the penetration for fireproofing.

First, the heat-expandable fire-resistant sheet 1 of the first embodiment cut to a predetermined length is wrapped around the cable C (Figure 3 (a)). The heat-expandable fire-resistant sheet 1 is rolled into a cylindrical shape so that the first band-shaped region 11 extends in the circumferential direction. It is preferable that the heat-expandable fire-resistant sheet 1 is wrapped around the cable C one or more times, preferably multiple times or more. It is also preferable that the heat-expandable fire-resistant sheet 1 is wrapped to a thickness that almost completely fills the space between the outer circumferential surface of the cable C and the inner circumferential surface of the through hole H.

The heat-expandable fire-resistant sheet 1 rolled into a cylindrical shape is pushed into the inside of the through-hole H so that the first band-shaped region 11 is positioned on the side where a fire is predicted to break out and is positioned inside the through-hole H, completing the fireproofing process (Figure 3(b)). Here, the side where a fire is predicted to break out refers to the side of the engine room where a fire is more likely to break out, for example, if the fire compartment is the wall separating the engine room from the fuel room. As a result, the side of the penetration where a fire will break out is mainly covered by the first fire-resistant member, as if it were capped.

When both side edges of the tape are made of the first fire-resistant material, as in the heat-expandable fire-resistant sheet 1 of the first embodiment, either the first band region 11 or the third band region 13 may be placed on the side where a fire is expected to break out, and in either case, the first band region 11 or the third band region 13 made of the first fire-resistant material is placed between the room on the side where a fire is expected to break out and the second band region 12. Therefore, as in the heat-expandable fire-resistant sheet 1 of the first embodiment, if the third band region 13 made of the first fire-resistant material is provided and the second band region 12 is placed between the first band region 11 and the third band region 13, the heat-expandable fire-resistant sheet 1 is installed without having to consider the ease of fire breakout or the direction of fire propagation, which improves workability.

The function and effect of the thermally expandable fire-resistant sheet 1 of the above embodiment will be described.
According to the heat-expandable fire-resistant sheet 1 of the above embodiment, since the heat-expandable fire-resistant sheet 1 is a sheet-shaped fire-resistant treatment member made of a heat-expandable fire-resistant resin composition, the heat-expandable fire-resistant sheet 1 can be cut to a predetermined length and placed in the gap or through hole of the through-hole to complete the fire-resistant treatment, which makes the application easy. In addition, if the heat-expandable fire-resistant sheet 1 is flexible, the flexibility of the sheet can be utilized to roll the heat-expandable fire-resistant sheet 1 into a cylindrical shape and push it into the through-hole of the through-hole to fix it, thereby particularly improving the application efficiency of the fire-resistant treatment.

In addition, the heat-expandable fireproof sheet 1 of the above embodiment has the first band-shaped region 11 made of the first fireproof material and the second band-shaped region 12 made of the second fireproof material arranged side by side in an integrated manner, and since the first fireproof material has a higher shape retention after expansion than the second fireproof material, the penetration part is blocked for a long time in the event of a fire. That is, the part of the first band-shaped region 11 made of the first fireproof material, which has a higher shape retention after expansion, can maintain its shape for a long time even when exposed to flames or hot air, and the fireproofing treatment member is less likely to be lost. Furthermore, since the part of the second band-shaped region 12 made of the second fireproof material can be made more expansible than the first band-shaped region, even if the expansion of the first band-shaped region 11 is insufficient and a gap occurs, the gap can be filled by the expansion of the second band-shaped region 12 made of the second fireproof material, and it is possible to prevent flames and hot air from passing through the penetration part.

The heat-expandable fire-resistant sheet 1 of the above embodiment can be completed by rolling the heat-expandable fire-resistant sheet into a cylindrical shape so that the first band-like region extends in the circumferential direction, and placing the cylindrically rolled heat-expandable fire-resistant sheet in the through hole of the penetration part so that the first band-like region is located on the side where a fire is predicted to break out. Therefore, the first band-like region 11 made of the first fire-resistant material, which is easy to apply the fire-resistant treatment and has high shape retention after expansion, is placed on the flame side, while the second band-like region 12 made of the second fire-resistant material can seal the gap, and the penetration part can be reliably blocked for a long period of time in the event of a fire.

Furthermore, when a third band region 13 made of the first fireproof material is provided and the second band region 12 is arranged integrally between the first band region 11 and the third band region 13, the band region made of the first fireproof material, which has high shape retention after expansion, can be made to face the side from which the flame comes, regardless of the direction from which the flame comes from the through hole. In this case, the workability of the fireproofing treatment is further improved since the work can be performed without much consideration of which direction the flame comes from. In addition, the band regions resistant to flame and hot air are arranged on both sides, so the long-term reliability of the fireproofing treatment is also improved.

Furthermore, when the first fire-resistant material contains aluminum phosphite, the first fire-resistant material is more likely to retain its shape after expansion, and the long-term reliability of the fire-resistant treatment can be improved.

In addition, when the first and second refractory materials contain thermally expandable graphite, the expansion characteristics of the first and second refractory materials are easier to adjust, making it easier for the expanded refractory materials to maintain appropriate insulating properties, which particularly improves the long-term reliability of the fireproofing treatment.

Furthermore, when arranging and integrating the first band region 11 and the second band region 12 as in the first embodiment described above, the following effect can be obtained by extending the first fire-resistant material constituting the first band region 11 thinly and stacking it onto the second band region 12 made of the second fire-resistant material.
Since the first band region 11 and the second band region 12 are firmly and securely joined together, separation of the first band region 11 and the second band region 12 during transportation or construction can be prevented, thereby improving construction ease.

Furthermore, when arranging and integrating the first band region 11, the second band region 12, and the third band region 13 as in the first embodiment described above, the following effect can be obtained by extending the first fire-resistant material thinly between the first band region 11 and the third band region 13 and stacking the second band region 12 made of the second fire-resistant material onto this thin extension.
In this case, the portion where the first fire-resistant material is thinly extended between the first band region 11 and the third band region 13 is less likely to expand than the second fire-resistant material and has a high degree of shape retention after expansion, so that the second band region made of the second fire-resistant material is prevented from expanding excessively in the central axial direction of the through hole and pushing out the first band region 11 and the third band region 13 to the outside of the through hole. This prevents the first band region 11 and the third band region 13, which have a high degree of shape retention after expansion, from falling out of the through part and being lost, and the long-term reliability of the fire-resistant treatment is further improved.

The invention is not limited to the above-described embodiment, and can be implemented with various modifications. Other embodiments of the invention are described below, but in the following description, the differences from the above-described embodiment will be mainly described, and detailed descriptions of similar parts will be omitted. Furthermore, these embodiments can be implemented by combining parts with each other, or by substituting parts.

FIG. 4 shows the structure of the heat-expandable fireproof sheet 2 of the second embodiment in a plan view and a cross-sectional view. The heat-expandable fireproof sheet 2 of the second embodiment is also tape-shaped. In FIG. 4, the up-down direction of the figure is the width direction of the tape. In this embodiment, the heat-expandable fireproof sheet 2 is configured such that a first band-shaped region 21 made of a first fireproof material and a second band-shaped region 22 made of a second fireproof material are integrated so as to be aligned when viewed from the direction perpendicular to the surface of the sheet. As in this embodiment, the third band-shaped region does not have to exist.

In the case of the heat-expandable fire-resistant sheet 2 of the second embodiment, as in the first embodiment, the heat-expandable fire-resistant sheet 2 is rolled into a cylindrical shape so that the first band-shaped region 21 extends in the circumferential direction, and the cylindrically rolled heat-expandable fire-resistant sheet is placed in the through hole of the penetration part so that the first band-shaped region 21 is located on the side where a fire is predicted to break out, thereby completing the fireproofing treatment, making the construction simple, and blocking the penetration part for a long period of time in the event of a fire.

Also, as in this embodiment, the first band region 21 made of the first fire-resistant material and the second band region 22 made of the second fire-resistant material may be joined by forming each region into a single-layer tape shape and butting the ends of the regions together, as shown in the cross-sectional view of Figure 4. In this case, the manufacture of the thermally expandable fire-resistant sheet 2 is simplified.

In addition, although not shown, the thermally expandable fire-resistant sheet 2 may further include other layers, such as a woven fabric layer of glass fiber. Such layers function as reinforcing layers to prevent the first band region 21 and the second band region 22 from coming apart, and in the event of a fire, they suppress the expansion of each fire-resistant material in a direction along the sheet surface and promote the expansion of the first band region 21 and the second band region 22 in the thickness direction of the sheet, thereby further improving fire resistance.

The heat-expandable fire-resistant sheet 3 of the third embodiment, in which the band-shaped regions are arranged in the same manner as in the first embodiment when viewed perpendicular to the surface of the sheet, can also be configured to have a cross-sectional structure as shown in Figure 5. In Figure 5, the cross section is shown so that the left and right sides of the figure are in the width direction of the tape. The heat-expandable fire-resistant sheet 3 of the third embodiment differs from the heat-expandable fire-resistant sheet 1 of the first embodiment in terms of the cross-sectional structure, i.e., the joining form of each band-shaped region, but is otherwise similar to the heat-expandable fire-resistant sheet 1 of the first embodiment and exhibits similar effects.

In the third embodiment of the heat-expandable fireproof sheet 3, the second fireproof material constituting the second band region 32 is thinly extended toward the outside in the width direction of the tape, and the first band region 31 and the third band region 33 made of the first fireproof material are laminated and integrated on the extended portions. With this configuration, it becomes easier to increase the expansibility of the first band region 31 and the third band region 33 in the radial direction of the through hole, and the first band region 31 and the third band region 33 contribute more to improving the fireproof performance.

In the above embodiment, the heat-expandable fire-resistant sheet has been described as being in the form of a tape, but the heat-expandable fire-resistant sheet may also be in the form of a sheet cut to a specified length and width.

The heat-expandable fire-resistant sheet may be a hard sheet, but from the viewpoint of improving workability, it is preferable that the sheet is soft enough to be easily bent with the fingers. It is preferable that the heat-expandable fire-resistant sheet is made of a fire-resistant material having a hardness of about 60 to 85 degrees on the Duro A scale.

In addition, if there are no particular problems with the workability of the fireproofing treatment, such as if the material is pre-formed into a cylindrical shape and can be applied by utilizing the elasticity of the material, the fireproof material that makes up the thermally expandable fireproof sheet may be a harder fireproof material, i.e., a fireproof material with a hardness of about 85 to 95 degrees on the Duro A scale.

In addition, in the above embodiment, the fireproofing treatment of a through-hole having a circular through-hole has been mainly described, but the fireproofing treatment using a heat-expandable fireproof sheet is not limited to the above-mentioned treatment method. For example, if the through-hole is a narrow slit-like gap, the fireproofing treatment can be completed by pushing a heat-expandable fireproof sheet cut to an appropriate size into the gap so that the first band-shaped region is located on the side where the fire will break out. Also, for example, if the through-hole is a rectangular corner hole, the fireproofing treatment can be completed by stacking heat-expandable fireproof sheets cut to an appropriate size so that the first band-shaped region is located on the side where the fire will break out, and filling the space inside the corner hole.

The thermally expandable fire-resistant sheet of the above embodiment, which is flexible enough to be wound multiple times or more , can be used for fireproofing the penetration parts of fire compartments, and has high industrial utility.

1 Thermally expandable fireproof sheet 11 First band region 12 Second band region W Wall H Through hole C Cable

Claims (6)

A thermally expandable fireproof sheet having flexibility that allows it to be wound around a cable or the like inserted into a penetration part of a fire compartment multiple times or more ,
When viewed from the perpendicular direction of the sheet,
a first band region made of a first refractory material;
a second band-shaped region made of a second refractory material is integrally formed side by side with the second band-shaped region,
The first fire-resistant material and the second fire-resistant material are both thermally expandable fire-resistant resin compositions,
The first refractory material has a higher shape retention after expansion than the second refractory material.
Thermally expandable fireproof sheet. Further, a third band-shaped region made of the first refractory material is provided,
The second band region is disposed integrally between the first band region and the third band region.
The thermally expandable fire-resistant sheet according to claim 1. the first refractory material comprises aluminum phosphite;
The thermally expandable fire-resistant sheet according to claim 1 or 2. the first refractory material and the second refractory material comprise thermally expandable graphite;
The thermally expandable fireproof sheet according to claim 3. A method for fireproofing a penetration part using the thermally expandable fireproof sheet according to claim 1,
The thermally expandable fire-resistant sheet is rolled into a cylindrical shape so that the first band-shaped region extends in a circumferential direction;
A thermally expandable fire-resistant sheet rolled into a cylindrical shape is placed in the hole of the penetration part so that the first band-shaped region is located on the side where a fire is expected to break out;
Fireproofing treatment method. A fireproof structure for a penetration part using the thermally expandable fireproof sheet according to claim 1,
The thermally expandable fireproof sheet is
In a state where the first band-shaped region is rolled into a cylindrical shape so as to extend in the circumferential direction,
A first band-shaped area is disposed on the side where a fire is expected to occur, the first band-shaped area being disposed in the hole of the penetration.
Fireproof construction of penetration parts.

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