JP6737569B2 - Cable protection tube and fireproof structure - Google Patents

Description

The present invention relates to a cable protection tube including a thermal expansion material, and a fireproof structure including the cable protection tube.

Conventionally, there has been proposed a technique for preventing a fire from propagating through a through hole of a partition by using a thermal expansion agent. The thermal expansion material has a tape shape, a sheet shape, or a putty shape, and Patent Document 1 discloses a refractory structure of a partition penetrating portion using a thermal expansion sheet or a thermal expansion seal. In this patent document 1, a protective tube for a cable is passed through the passage of the partition. This protection tube has bellows-shaped irregularities, and one or more cables are passed through the protection tube. The thermal expansion seal is wrapped around the root of the protective tube extending from the through passage. The thermal expansion sheet is attached to the peripheral edge of the opening of the through passage in the partition. In Patent Document 1, when a fire occurs, the thermal expansion sheet and the thermal expansion seal expand due to the heat of the fire, thereby filling the gap created by the deformation or burning of the protective tube.

Japanese Patent No. 4060844

However, in Patent Document 1, the work of winding the thermal expansion seal and the work of attaching the thermal expansion sheet are troublesome, and the above-mentioned work may be difficult depending on the opening shape and position of the through passage. Further, the protective tube is formed in a bellows shape in order to reduce friction when the cable is pulled in, and has a small contact area with the cable. Therefore, in the event of a fire, the flame may propagate through the cable, and the fire may propagate to the opposite compartment via the compartment.

The present invention has been made to solve the above problems, and an object thereof is to provide a protective tube for a cable that can easily realize a fireproof measure for a through passage of a partition body, and a fireproof structure including the protective tube for the cable. Is to provide.

A cable protection tube according to a first aspect of the present invention is a cable protection tube in which a cable is inserted,
A thermal expansion material is included.

Preferably, a thermal expansion layer made of the thermal expansion material is provided on at least the inner peripheral surface.

A fire resistant structure according to a second aspect of the present invention includes a partition body having a through passage and a cable protection tube inserted into the through passage of the partition body, and the cable positioned in the through passage of the partition body. The scope of the protective tube for use includes a thermal expansion material.

Preferably, a fire-resistant seal material filled between the body surface of the through passage and the outer peripheral surface of the cable protection tube is further provided.

A fire resistant structure according to a third aspect of the present invention includes a partition body having a through passage, a tubular sleeve inserted through the through passage of the partition body, and a cable protection tube inserted inside the sleeve. A thermal expansion material is included in the area of the cable protection tube that is provided inside the passage of the partition.

Preferably, a fire-resistant sealing material filled between the inner peripheral surface of the sleeve and the outer peripheral surface of the cable protection tube is further provided.

In the fireproof structure according to the second aspect and the third aspect of the present invention, the thermal expansion layer made of the thermal expansion material is at least for the cable in the range of the cable protection tube located in the through passage of the partition. It is provided on the inner peripheral surface of the protection tube.

According to the present invention, since the thermal expansion material is included in the cable protective tube, the thermal expansion material can be arranged in the through passage by a simple operation of inserting the cable protective tube into the through passage of the partition. By performing this simple operation, it is possible to block the voids in the through-passage caused by the thermal deformation or burning of the protective tube when a fire occurs with the thermal expansion material. Therefore, it is possible to easily implement fire protection measures for the through passage.

It is a perspective view showing a fireproof structure concerning an embodiment of the present invention. It is the aa sectional view taken on the line of FIG. It is the bb sectional view taken on the line of FIG. FIG. 6 is a cross-sectional view showing a modified example of the cable protection tube of the present invention, corresponding to FIG. 3. FIG. 6 is a cross-sectional view showing a modified example of the cable protection tube of the present invention, corresponding to FIG. 3. It is a perspective view which shows the fireproof structure which concerns on the modification of this invention. It is the aa sectional view taken on the line of FIG. It is a perspective view which shows the fireproof structure which concerns on the modification of this invention. FIG. 9 is a sectional view taken along line aa of FIG. 8.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a fire resistant structure 1 according to an embodiment of the present invention. FIG. 2 is a sectional view taken along the line aa of FIG. FIG. 3 is a sectional view taken along line bb of FIG.

The fire resistant structure 1 according to the present embodiment includes a partition 2, a tubular sleeve 3, a cable protection tube 4 (hereinafter abbreviated as protection tube 4), and a fire resistant sealing material 5.

The partition body 2 is a hollow wall that partitions the fireproof compartments A and A. The partition body 2 includes a pair of wall members 6A and 6B arranged at intervals. Each of the pair of wall members 6A and 6B is made of gypsum board and extends in the vertical direction. A pair of through holes 60A and 60B are formed in the pair of wall materials 6A and 6B. These through holes 60A and 60B and the gap 7 between the wall members 6A and 6B form a through passage 8 of the partition 2.

The sleeve 3 is inserted into the through passage 8 of the partition 2. As the sleeve 3, a metal or thermally expansive refractory sleeve can be used. The metal refractory sleeve is preferably steel and such sleeves are known. Examples of the heat-expandable refractory sleeve include a sleeve made of a heat-expandable resin composition containing a resin as a binder or a matrix, heat-expandable graphite and an inorganic filler, and commercially available for forming the sleeve. Examples of the fire-resistant sheet include a sheet of a heat-expandable resin composition containing Fiblock (registered trademark, epoxy resin or butyl rubber as a resin component, a phosphorus compound, heat-expandable graphite, an inorganic filler, etc., manufactured by Sekisui Chemical Co., Ltd. Shaped article), a fire barrier manufactured by Sumitomo 3M Limited (sheet material made of a resin composition containing chloroprene rubber and verculite, expansion coefficient: 3 times, thermal conductivity: 0.20 kcal/m·h·° C.), Mitsui Kinzoku Kagaku Co., Ltd.'s media cut (sheet material consisting of resin composition containing polyurethane resin and thermally expansive graphite, expansion coefficient: 4 times, thermal conductivity: 0.21 kcal/m·h·° C.), etc. ..

The protection tube 4 is inserted inside the sleeve 3. The protective tube 4 is, for example, a synthetic resin flexible electric wire tube having bellows-shaped irregularities (the irregularities of the protective tube 4 are not shown in FIGS. 2 and 3 ). As such a flexible conduit tube made of synthetic resin, there are a synthetic resin tube having flame resistance (PF tube) and a synthetic resin tube having no flame resistance (CD tube), which are manufactured mainly from polyethylene, polypropylene, etc. To be done. The term "heat resistance" as used herein does not mean a material that is ignited when contacting with a flame, but does not propagate or spread and is not deformed or burned by the fire after the fire is removed.

The refractory sealing material 5 is filled between the inner peripheral surface of the sleeve 3 and the outer peripheral surface of the protective tube 4. As this sealing material 5, Sekisui Chemical Co., Ltd.'s Fiblock (registered trademark, resin components such as epoxy resin and rubber resin, thermal expansion components such as thermally expansive graphite, phosphorus compounds, thermal expansion properties including inorganic fillers, etc. A molded product of the resin composition) or a fire resistant putty can be used. Examples of the refractory putty include a clay-like filler containing an organic binder such as polybutene and polybutadiene, and an inorganic filler such as gypsum, aluminum hydroxide and magnesium hydroxide, a paste-like filler, and a thermal expansion property. Examples thereof include a clay-like filler or a paste-like filler made of a refractory resin composition. Among them, gypsum, aluminum hydroxide, magnesium hydroxide and the like have an endothermic effect when exposed to heat such as fire, and can prevent the protective tube 4 from reaching a high temperature. It is preferable to use a clay-like filler or paste-like filler containing magnesium oxide or the like. When a fireproof sleeve is used as the sleeve 3, it is possible to prevent the fireproof putty from dropping onto the floor between the wall members 6A and 6B in the event of a fire. Clay-like fillers and paste-like fillers made of a heat-expandable refractory resin composition are preferable because they expand when exposed to heat such as fire and exhibit a heat insulating effect. Although FIG. 2 shows an example in which the sealing material 5 extends over the entire width of the sleeve 3, the length and installation position of the sealing material 5 can be set arbitrarily. For example, when the seal material 5 is formed of a heat-expandable material, the length of the seal material 5 is long as long as the heat-expanded seal material 5 can fill the gap between the sleeve 3 and the protective tube 4. The sheath installation position can be set arbitrarily. Further, when the sleeve 3 is formed of a thermally expansive material, the sealing material 5 may be omitted.

A cable 9 is inserted inside the protective tube 4. The cable 9 is, for example, a CV cable, a CVD cable in which two single-core cables are bundled, a CVT cable in which three single-core cables are bundled, and other power cables and signal cables. Although FIG. 1 to FIG. 3 show an example in which one cable 9 is inserted into the protection tube 4, the number of cables 9 is not limited, and a plurality of cables 9 are provided inside the protection tube 4. It may be inserted.

In the range of the protection tube 4 located in the through passage 8, the inner peripheral surface 4a of the protection tube 4 is recessed radially outward, and the thermal expansion layer 10 is provided on the recessed inner peripheral surface 4a. In addition, as described above, it is not essential that the inner peripheral surface 4a of the protection tube 4 is recessed, and the thermal expansion layer 10 may be provided on the inner peripheral surface 4a having no recess.

The length L (FIG. 2) of the thermal expansion layer 10 along the axial direction of the protection tube 4 matches the width of the through passage 8 (the total length of the widths of the through holes 60A and 60B and the gap 7). To do. By setting the length of the thermal expansion layer 10 in this manner, the thermal expansion layer 10 extends over the entire width of the through passage 8.

The thermal expansion layer 10 described above is formed of a thermal expansion material having fire resistance. Examples of the thermal expansion material include a thermal expansion resin composition containing a thermoplastic resin as a binder or a matrix, a rubber substance, or a synthetic resin such as a thermosetting resin, thermal expansion graphite, and an inorganic filler.

As the thermoplastic resin, for example, polypropylene resin, polyethylene resin, polybutene resin, polyolefin resin such as polypentene resin, polystyrene resin, acrylonitrile-butadiene-styrene resin, polycarbonate resin, polyphenylene ether resin, Examples thereof include acrylic resins, polyamide resins, polyvinyl chloride resins and the like.

Examples of the rubber substance include natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), 1,2-polybutadiene rubber (1,2-BR), styrene-butadiene rubber (SBR), chloroprene rubber ( CR), nitrile rubber (NBR), butyl rubber (IIR), ethylene-propylene rubber (EPR, EPDM), chlorosulfonated polyethylene (CSM), acrylic rubber (ACM, ANM), epichlorohydrin rubber (CO, ECO), multiple vulcanization Examples thereof include rubber (T), silicone rubber (Q), fluororubber (FKM, FZ), urethane rubber (U) and the like.

Examples of the thermosetting resin include polyurethane, polyisocyanate, polyisocyanurate, phenol resin, epoxy resin, urea resin, melamine resin, unsaturated polyester resin, and polyimide.

These resins may be used alone or in combination of two or more. Among these resins, a polyolefin-based resin or a rubber substance is preferable, and a polyethylene-based resin is particularly preferable, from the viewpoint that it can be molded at a temperature not higher than the expansion temperature when the later-described thermally expandable graphite is blended. In addition, a rubber substance is preferable from the viewpoint that a large amount of a filler can be blended in order to further improve the fire protection performance. Further, from the viewpoint of increasing the flame retardancy of the resin itself and improving the fireproof performance, a phenol resin and an epoxy resin are preferable. In particular, an epoxy resin is preferable because the selection of the molecular structure is wide and it is easy to adjust the fireproof performance and mechanical properties of the resin composition.

Expandable graphite is a conventionally known substance, and powders of natural scaly graphite, pyrolytic graphite, Kish graphite and the like are mixed with inorganic acids such as concentrated sulfuric acid, nitric acid and selenate, and concentrated nitric acid, perchloric acid and perchlorate. , A graphite intercalation compound produced by treatment with a strong oxidant such as permanganate, dichromate, hydrogen peroxide, etc., which is a crystalline compound that maintains the layered structure of carbon. The heat-expandable graphite obtained by the acid treatment is preferably neutralized with ammonia, an aliphatic lower amine, an alkali metal compound, an alkaline earth metal compound or the like.

The particle size of the thermally expandable graphite is preferably 20 to 200 mesh. If the particle size is smaller than 200 mesh, the degree of expansion of graphite is small and a sufficient expanded heat insulating layer cannot be obtained, and if the particle size is larger than 20 mesh, the degree of expansion of graphite is large, but it is mixed with resin. At that time, the dispersibility deteriorates and the physical properties are unavoidably deteriorated. Examples of commercially available products of thermally expandable graphite include "GREP-EG" manufactured by Tosoh Corporation, "GRAFGUARD" manufactured by GRAFTECH, and the like.

It is preferable to further add an inorganic filler to the heat-expandable resin composition.

When the expansion heat insulating layer is formed, the inorganic filler suppresses heat transfer by increasing the heat capacity, and acts as an aggregate to improve the strength of the expansion heat insulating layer. The inorganic filler is not particularly limited, and examples thereof include metal oxides such as alumina, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, iron oxide, tin oxide, antimony oxide, and ferrites; calcium hydroxide, magnesium hydroxide. Hydrous inorganics such as aluminum hydroxide and hydrotalcite; metal carbonates such as basic magnesium carbonate, calcium carbonate, magnesium carbonate, zinc carbonate, strontium carbonate, and barium carbonate.

In addition to these, as inorganic fillers, calcium salts such as calcium sulfate, gypsum fiber, calcium silicate; silica, diatomaceous earth, dawsonite, barium sulfate, talc, clay, mica, montmorillonite, bentonite, activated clay, sepiolite. , Imogolite, sericite, glass fiber, glass beads, silica balun, aluminum nitride, boron nitride, silicon nitride, carbon black, graphite, carbon fiber, carbon balun, charcoal powder, various metal powders, potassium titanate, magnesium sulfate " MOS” (trade name), lead zirconate titanate, aluminum borate, molybdenum sulfide, silicon carbide, stainless fiber, zinc borate, various magnetic powders, slag fiber, fly ash, dehydrated sludge and the like. These inorganic fillers may be used alone or in combination of two or more.

The particle size of the inorganic filler is preferably 0.5 to 100 μm, more preferably 1 to 50 μm. When the added amount of the inorganic filler is small, the dispersibility greatly affects the performance, and therefore, it is preferable that the particle size is small, but if it is less than 0.5 μm, secondary aggregation occurs and the dispersibility deteriorates. When the addition amount is large, the viscosity of the resin composition increases and the moldability decreases as the filling rate increases, but since the viscosity of the resin composition can be decreased by increasing the particle size, A large diameter is preferable. If the particle size exceeds 100 μm, the surface properties of the molded product and the mechanical properties of the resin composition deteriorate.

Examples of the inorganic filler include, for example, aluminum hydroxide having a particle size of 18 μm, “Hidilite H-31” (manufactured by Showa Denko KK), particle size of 25 μm, “B325” (manufactured by ALCOA), and calcium carbonate having a particle size. Examples include 1.8 μm “Whiten SB Red” (manufactured by Bihoku Flour Milling Industry Co., Ltd.), “BF300” having a particle size of 8 μm (Bihoku Flour Milling Industry Ltd.), and the like.

In the heat-expandable resin composition, in order to increase the strength of the expansion heat insulating layer and improve the fireproof performance, a phosphorus compound may be further added in addition to the above respective components. The phosphorus compound is not particularly limited, and examples thereof include red phosphorus; various phosphoric acid esters such as triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresyl diphenyl phosphate, xylenyl diphenyl phosphate; sodium phosphate, Examples thereof include metal phosphates such as potassium phosphate and magnesium phosphate; ammonium polyphosphates; compounds represented by the following chemical formula (1), and the like. Among these, red phosphorus, ammonium polyphosphates, and compounds represented by the following chemical formula (1) are preferable from the viewpoint of fireproof performance, and ammonium polyphosphates are more preferable in terms of performance, safety, cost, and the like. ..

In the chemical formula (1), R1 and R3 represent hydrogen, a linear or branched alkyl group having 1 to 16 carbon atoms, or an aryl group having 6 to 16 carbon atoms. R2 is a hydroxyl group, a linear or branched alkyl group having 1 to 16 carbon atoms, a linear or branched alkoxyl group having 1 to 16 carbon atoms, an aryl group having 6 to 16 carbon atoms, or a carbon number It represents an aryloxy group of 6 to 16.

As the red phosphorus, commercially available red phosphorus can be used, but from the viewpoints of moisture resistance and safety such as not spontaneously igniting during kneading, those obtained by coating the surface of red phosphorus particles with a resin are preferably used. The ammonium polyphosphates are not particularly limited, and examples thereof include ammonium polyphosphate, melamine-modified ammonium polyphosphate, and the like, and ammonium polyphosphate is preferably used from the viewpoint of handleability and the like. Examples of commercially available products include "AP422" and "AP462" manufactured by Clariant, and "FR CROS 484" and "FR CROS 487" manufactured by Budenheim Iberica.

The compound represented by the chemical formula (1) is not particularly limited, and examples thereof include methylphosphonic acid, dimethyl methylphosphonate, diethyl methylphosphonate, ethylphosphonic acid, propylphosphonic acid, butylphosphonic acid, 2-methylpropylphosphonic acid, and t-. Butylphosphonic acid, 2,3-dimethyl-butylphosphonic acid, octylphosphonic acid, phenylphosphonic acid, dioctylphenylphosphonate, dimethylphosphinic acid, methylethylphosphinic acid, methylpropylphosphinic acid, diethylphosphinic acid, dioctylphosphinic acid, phenylphosphine Acid, diethylphenylphosphinic acid, diphenylphosphinic acid, bis(4-methoxyphenyl)phosphinic acid and the like can be mentioned. Among them, t-butylphosphonic acid is preferable in terms of high flame retardancy, although it is expensive. The above phosphorus compounds may be used alone or in combination of two or more.

Further, in the resin composition, as long as the physical properties are not impaired, phenolic, amine, and sulfur antioxidants, metal damage inhibitors, antistatic agents, stabilizers, crosslinking agents, lubricants, softeners , Pigments, etc. may be added. In addition, a general flame retardant may be added, and the fire suppression performance can be improved by the combustion suppressing effect of the flame retardant.

In the resin composition constituting the heat-expandable refractory material, the compounding amount of the heat-expandable graphite is preferably 10 to 300 parts by weight with respect to 100 parts by weight of the resin component. When the compounding amount is 10 parts by weight or more, the volume expansion coefficient is large and the burned part of the synthetic resin member constituting the resin sash can be sufficiently filled, and the fire prevention performance is exhibited. Strength is maintained. The blending amount of the thermally expandable graphite is more preferably 20 to 250 parts by weight.

In the resin composition, the compounding amount of the inorganic filler is preferably 10 to 400 parts by weight with respect to 100 parts by weight of the resin component. When the amount is 10 parts by weight or more, sufficient fireproof performance is obtained, and when the amount is 400 parts by weight or less, mechanical strength is maintained. The blending amount of the inorganic filler is more preferably 40 to 350 parts by weight.

When a phosphorus compound is added to the resin composition, the compounding amount of the phosphorus compound is 30 to 300 parts by weight with respect to 100 parts by weight of the resin component. If the amount is 30 parts by weight or more, the effect of improving the strength of the expansion heat insulating layer is sufficient, and if it is 300 parts by weight or less, the mechanical strength is maintained. The compounding amount of the phosphorus compound is more preferably 40 to 250 parts by weight.

Examples of commercially available heat-expandable fire-resistant sheets that can be used to form the heat-expansion layer 10 include, for example, Sekisui Chemical Co., Ltd. Fiblock (registered trademark. Epoxy resin or butyl rubber as a resin component, a phosphorus compound, Sheet-shaped molded product of a heat-expandable resin composition containing heat-expandable graphite, an inorganic filler, etc., fire barrier of Sumitomo 3M (sheet material made of a resin composition containing chloroprene rubber and verculite, expansion coefficient) : 3 times, thermal conductivity: 0.20 kcal/m·h·° C.), Mitsui Metal Coating Chemical Co., Ltd.'s media cut (sheet material made of a resin composition containing polyurethane resin and thermally expandable graphite, expansion rate: 4 times) , Thermal conductivity: 0.21 kcal/m·h·° C.) and the like.

The refractory structure 1 is constructed by sequentially performing the following works (i) to (iv).
(I) Insert the sleeve 3 into the through passage 8 of the partition 2.
(Ii) The protective tube 4 is inserted into the sleeve 3 and the thermal expansion layer 10 is arranged within the through passage 8.
(Iii) The seal material 5 is filled between the inner peripheral surface of the sleeve 3 and the outer peripheral surface of the protective tube 4.
(Iv) Insert the cable 9 into the protective tube 4.

When a fire occurs in one of the fireproof compartments A and A, the heat of the fire transmitted through the inside of the protection tube 4 causes the thermal expansion layer 10 provided on the inner peripheral surface 4a of the protection tube 4 to expand. To do. Then, the expanded thermal expansion layer 10 closes the void generated by the thermal deformation or burning of the protective tube 4. Therefore, it is possible to prevent the fire from propagating to the other of the fireproof sections A and A.

According to this embodiment, since the thermal expansion material is included in the protection tube 4, the thermal expansion is performed in the penetration path 8 by a simple work of inserting the protection tube 4 into the penetration path 8 (in the sleeve) of the partition 2. Material can be placed. By performing this simple operation, the voids in the through-passages 8 caused by the thermal deformation or burning of the protective tube 4 when a fire occurs can be closed with the thermal expansion material. Therefore, it is possible to easily implement a fireproof measure for the through passage 8.

Further, since the thermal expansion layer 10 made of the thermal expansion material is provided on the inner peripheral surface 4a of the protection tube 4, the heat of the fire is transmitted to the thermal expansion material early. Therefore, the thermal expansion material can be expanded in the initial stage of the fire. Therefore, it is possible to reliably prevent the fire from propagating through the through passage 8.

Further, since the thermal expansion layer 10 is provided only in the range of the protection tube 4 located in the through passage 8, the material cost of the thermal expansion material can be kept low, and the fireproofing measures of the through passage 8 can be realized.

Further, by denting the inner peripheral surface 4a of the protection tube 4 and providing the thermal expansion layer 10 in this recess, a large internal space of the protection tube 4 can be secured. Therefore, the cable 9 can be smoothly inserted into the protection tube 4.

Further, since the thermal expansion layer 10 extends over the entire width of the through passage 8, it is possible to close the voids caused by the thermal deformation or burning of the protective tube 4 at any position in the through passage 8.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified.

For example, in the above-described embodiment, the example in which the thermal expansion layer 10 is provided on the inner peripheral surface 4a of the protective tube 4 has been shown, but as shown in FIG. It may be provided. By doing so, the thermal expansion agent also expands due to the heat transmitted between the sleeve 3 and the protective tube 4, and closes the gap generated by the thermal deformation of the protective tube 4 or the like. Alternatively, as shown in FIG. 5, the protective tube 4 may be formed by alternately laminating the thermal expansion layers 10 and the synthetic resin layers 11. In this case, the thermal expansion material expands due to the heat transmitted through the protective tube 4, thereby closing the gap generated by the thermal deformation of the protective tube 4. Alternatively, the protective tube 4 may be formed by molding a mixture obtained by kneading the thermal expansion material and the synthetic resin. Even in this case, the thermal expansion material expands due to the heat transmitted through the protective tube 4, so that the gap generated by the thermal deformation of the protective tube 4 can be closed.

Further, the sleeve 3 may be omitted. FIG. 6 is a perspective view showing a modified example in which the sleeve 3 is omitted. FIG. 7 is a sectional view taken along the line aa of FIG. In the modified example shown in FIGS. 6 and 7, the protective tube 4 is inserted into the through passage 8. Then, as shown in FIG. 7, a thermal expansion layer 10 made of a thermal expansion material is provided in the range of the protection tube 4 located in the through passage 8. Further, the fire-resistant seal material 5 is filled between the body surface of the through passage 8 (body surface of the through holes 60A and 60B) and the outer peripheral surface of the protective tube 4. Although FIG. 7 shows an example in which the thermal expansion layer 10 is provided on the inner peripheral surface 4 a of the protective tube 4, the thermal expansion layer 10 may be provided on the outer peripheral surface of the protective tube 4, or the thermal expansion layer 10 may be provided. And the synthetic resin layer may be alternately laminated to form the protective tube 4, or the protective tube 4 may be formed by molding a mixture obtained by kneading the thermal expansion material and the synthetic resin. Good.

The partition 1 is not limited to a hollow wall made of gypsum board, but may be any other wall such as a lightweight aerated concrete (ALC) wall or a wall faithfully formed of mortar. The partition 1 is not limited to a wall extending in the vertical direction, but may be a floor or a plate extending in the horizontal direction.

FIG. 8 is a perspective view showing a modified example in which the partition 2 is a floor extending in the horizontal direction. 9 is a sectional view taken along the line aa of FIG. In the modified examples shown in FIGS. 8 and 9, the partition body 2 partitions the upper layer section C and the lower layer section D. A through passage 8 extending in the vertical direction is formed in the partition body 2, and the protective tube 4 is inserted into the through passage 8. Then, as shown in FIG. 9, within the range of the through passage 8, the thermal expansion layer 10 made of a thermal expansion material is provided on the inner peripheral surface 4 a of the protection tube 4. Further, the fire-resistant seal material 5 is filled between the body surface of the through passage 8 (body surface of the through holes 60A and 60B) and the outer peripheral surface of the protective tube 4. According to the above modification, when a fire occurs in one of the sections C and D, the heat of the fire transmitted through the inside of the protection tube 4 causes the heat provided on the inner peripheral surface 4a of the protection tube 4 to be provided. The expansion layer 10 expands. Then, the expanded thermal expansion layer 10 closes the void generated by the thermal deformation or burning of the protective tube 4. Therefore, it is possible to prevent the fire from propagating to the other of the sections C and D. 8 and 9, the thermal expansion layer 10 may be provided also on the outer peripheral surface of the protective tube 4 within the range of the through passage 8, or the thermal expansion layer and the synthetic resin layer are alternately arranged. The protective tube 4 may be formed by stacking, or the protective tube 4 may be formed by molding a mixture in which the thermal expansion material and the synthetic resin are kneaded.

1 Fireproof structure 2 Compartment 3 Sleeve 4 Cable protection tube,
4a Inner surface of protective tube for cable 5 Sealing material 6A, 6A Wall material 60A, 60B Through hole of wall material 7 Void between through holes 8 Penetration path of compartment 9 Cable 10 Thermal expansion layer

Claims (5)

A protective tube for a cable with a thermal expansion layer through which the cable is inserted,
The cable protection tube with the thermal expansion layer ,
Has a bellows-shaped concavo-convex, is made of synthetic resin, and a cable protection tube which have a flexible,
Before SL thermal expansion layer with cable protective tube having a thermal expansion layer of a thermally expandable material that is provided in contact with the inner peripheral surface of the protective tube for the cable. A partition having a through passage,
A protective tube for a cable that is inserted into the passage of the partition,
The cable protection tube is made of synthetic resin and has flexibility,
A thermal expansion layer made of a thermal expansion material is provided in the range of the cable protection tube located in the through passage of the partition, and the thermal expansion layer covers the cable over substantially the entire length of the thermal expansion layer. Is in contact with the pipe,
A refractory sealing material filled between the body surface of the through passage and the outer peripheral surface of the cable protection tube ,
Inside the cable protection tube with a thermal expansion layer having the cable protection tube and the thermal expansion layer, the cable is inserted,
A refractory structure in which a gap is formed between the inner peripheral surface of the cable protection tube with the thermal expansion layer and the outer peripheral surface of the cable . A partition having a through passage,
A tubular sleeve that is inserted through the passage of the partition,
A protective tube for a cable inserted through the inside of the sleeve,
The cable protection tube is made of synthetic resin and has flexibility,
A thermal expansion layer made of a thermal expansion material is provided in the range of the cable protection tube located in the through passage of the partition, and the thermal expansion layer covers the cable over substantially the entire length of the thermal expansion layer. Is in contact with the pipe,
A refractory sealing material filled between the inner peripheral surface of the sleeve and the outer peripheral surface of the cable protection tube,
Inside the cable protection tube with a thermal expansion layer having the cable protection tube and the thermal expansion layer, the cable is inserted,
A refractory structure in which a gap is formed between the inner peripheral surface of the cable protection tube with the thermal expansion layer and the outer peripheral surface of the cable . The thermal expansion layer which consists of the said thermal expansion material is provided in at least the inner peripheral surface of the said protective tube for cables in the range of the said protective tube for cables located in the penetration path of the said division body. Fireproof structure described in. The refractory structure according to any one of claims 2 to 4, wherein the thermal expansion layer made of the thermal expansion material extends over the entire width of the through passage.

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