JP6588722B2 - Fireproof structure - Google Patents

Description

  The present invention relates to a fireproof structure including a cylindrical sleeve installed in a through-passage of a partition body.

  2. Description of the Related Art Conventionally, piping and wiring are inserted through a cylindrical sleeve installed in a through-passage of a building partition. Patent Document 1 discloses a technique for preventing a flame from propagating through a sleeve when a fire occurs. In Patent Document 1, bushings for protecting the wiring are provided at both ends of the sleeve. And the clearance gap between a wiring and a sleeve is covered with a thermally expansible sheet by winding the wiring penetrated by the sleeve, and the bushing of the end of a sleeve with a thermally expansible sheet. In the event of a fire, the thermally expandable sheet is thermally expanded to form an expanded insulation layer, and this expanded insulation layer blocks the gap between the wiring and the sleeve, preventing the flame from propagating through the sleeve. Is done.

JP 2007-31599 A

  By the way, after installing a cylindrical sleeve or conduit in the through-passage of the compartment, the construction of the building is interrupted, or by opening only the through-hole assuming a post-pipe, the sleeve or conduit There are cases where the sleeve is left open for a while without piping or wiring being inserted. When a fire breaks out in the building in this state, there is a possibility that the flame may propagate through the sleeve because it cannot prevent the flame from entering the sleeve. In this regard, since Patent Literature 1 is for winding a thermal expansion sheet around a wire inserted through the sleeve, it does not prevent the flame from propagating through the sleeve when no wire is inserted through the sleeve. Absent.

  The present invention has been made to solve the above-described problems, and an object of the present invention is a fireproof structure including a cylindrical sleeve installed in a through-passage of a partition body, and piping and wiring are inserted through the sleeve. It is intended to provide a fireproof structure that can prevent the spread of fire through a sleeve in a state where it is not.

  The fireproof structure of the present invention includes a partition body having a through passage, a cylindrical sleeve that is installed in the through passage of the partition body and is used for inserting piping and wiring, and the sleeve has piping and wiring. A fireproof sheet covering at least one of the openings at both ends of the sleeve when not inserted.

  Preferably, the refractory sheet is disposed with respect to the sleeve such that a center portion of the refractory sheet covers the opening of the sleeve and an outer peripheral portion of the refractory sheet is along a side surface of the sleeve. The metal wire is wound around the outer periphery of the fireproof sheet, so that the fireproof sheet is pressed against the sleeve.

  Preferably, a pair of the refractory sheets, one end of which is bundled with a first metal wire, is provided, one end side portion of the pair of refractory sheets covers the opening of the sleeve, and the other pair of refractory sheets The pair of refractory sheets are arranged with respect to the sleeve so that the end side portions are along the side surfaces of the sleeve, and a second metal wire is wound around the other end side portions of the pair of refractory sheets. Thus, the pair of fireproof sheets are pressed against the sleeve.

  Preferably, a refractory sealing material is filled between the housing surface of the through passage and the outer peripheral surface of the sleeve.

  According to the fireproof structure of the present invention, since the fireproof sheet covers the opening at one end of the sleeve in a state where the pipe and the wiring are not inserted through the sleeve, the pipe and the wiring are inserted through the sleeve. Even if a fire occurs, it is possible to prevent heat and fire from being transmitted through the sleeve. Therefore, it is possible to reduce the risk of fire spread.

It is sectional drawing which shows the fireproof structure which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the fireproof structure which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the operation | work which inserts wiring in a sleeve in 2nd Embodiment of this invention. It is sectional drawing which shows the fireproof structure which concerns on the modification of this invention.

  Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a fire prevention structure 1 according to a first embodiment of the present invention.

  As shown in FIG. 1, the fire prevention structure 1 according to the first embodiment includes a partition body 2, a cylindrical sleeve 3, a fireproof sealing material 4, and a fireproof sheet 5.

  The partition body 2 is a hollow wall that partitions the fire protection sections A and B. The partition body 2 includes a pair of wall members 6A and 6B that are arranged at intervals. Each of the pair of wall materials 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 members 6A and 6B. These through-holes 60A and 60B and the gap 7 between the wall materials 6A and 6B constitute a through-passage 8 of the partition body 2.

  The sleeve 3 is installed in the through passage 8 of the partition body 2. The sleeve 3 has a cylindrical shape that is open at both ends, and is used for inserting piping and wiring (not shown). The piping is, for example, a water supply / drainage pipe, an intake / exhaust pipe, a water pipe, a gas pipe, or a medium transfer pipe for air conditioning. The wiring 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, or another power cable or signal cable. Bushings 30 for protecting wiring and piping are provided at both ends of the sleeve 3.

  As the sleeve 3, a metal-made or heat-expandable fireproof sleeve can be used. The metal fireproof sleeve is preferably steel and such sleeves are well known. Examples of the heat-expandable fire-resistant 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 can be used to form the sleeve 3. As a commercially available fireproof sheet, for example, Sekisui Chemical Co., Ltd. Fiblok (registered trademark) of a thermally expandable resin composition containing epoxy resin or butyl rubber as a resin component, and containing a phosphorus compound, thermally expandable graphite, an inorganic filler, and the like. Sheet-like molded product), Sumitomo 3M Fire Barrier (sheet material comprising a resin composition containing chloroprene rubber and verculite, expansion coefficient: 3 times, thermal conductivity: 0.20 kcal / m · h · ° C.) , Mitsui Metal Paint Chemical Co., Ltd. medhihikat (sheet material consisting of a resin composition containing polyurethane resin and thermally expandable graphite, expansion coefficient: Times, the thermal conductivity: 0.21kcal / m · h · ℃) and the like.

  The fireproof sealing material 4 is filled between the housing surface of the through passage 8 (the housing surface of the through holes 60 </ b> A and 60 </ b> B) and the outer peripheral surface of the sleeve 3. As this sealing material 4, Sekisui Chemical Co., Ltd. Fibrok (registered trademark. Thermal expansion properties including resin components such as epoxy resins and rubber resins, thermal expansion components such as thermal expansion graphite, phosphorus compounds, inorganic fillers, etc. Resin composition moldings) and fire-resistant putty can be used. As this fire-resistant putty, for example, a clay-like filler containing an organic binder such as polybutene and polybutadiene and an inorganic filler such as gypsum, aluminum hydroxide, magnesium hydroxide, a paste-like filler, a thermal expansibility 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, etc. show endothermic action when exposed to heat such as fire, and can prevent the sleeve 3 from becoming high temperature. It is preferable to use a clay-like filler or a paste-like filler containing magnesium or the like. Further, when a fire-resistant sleeve is used as the above-described sleeve 3, it is possible to prevent the fire-resistant putty from dripping onto the floor between the wall materials 6A and 6B when a fire occurs. A clay-like filler or a paste-like filler made of a thermally expandable refractory resin composition is preferable because it expands when exposed to heat such as a fire and exhibits a heat insulating action.

  The fireproof sheet 5 covers one opening of the sleeve 3 (opening on the fireproof section B side of the sleeve 3) in a state where piping and wiring are not inserted through the sleeve 3. The fireproof sheet 5 is disposed with respect to the sleeve 3 such that the central portion 5 a covers the opening of the sleeve 3 and the outer peripheral portion 5 b is along the side surface of the sleeve 3. The fireproof sheet 5 is pressed against the sleeve 3 by winding the metal wire 9 around the outer peripheral portion 5 b of the fireproof sheet 5.

  The fireproof sheet 5 is formed from a thermally expandable material having fire resistance. Examples of the heat-expandable material include a heat-expandable resin composition containing a thermoplastic resin as a binder or a matrix, a rubber substance, or a synthetic resin such as a thermosetting resin, heat-expandable graphite, and an inorganic filler.

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

  Examples of rubber materials 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), polyvulcanized Examples thereof include rubber (T), silicone rubber (Q), fluorine rubber (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, polyimide, and the like.

  These resins may be used alone or in combination of two or more. Among these resins, when blending thermally expandable graphite described later, a polyolefin resin or a rubber substance is preferable from the viewpoint that molding is possible at or below the expansion temperature, and among them, a polyethylene resin is preferable. In addition, a rubber substance is preferable from the viewpoint that a large amount of filler can be blended in order to further improve the fireproof performance. Furthermore, a phenol resin and an epoxy resin are preferable from the viewpoint of increasing the flame retardancy of the resin itself and improving the fire prevention performance. 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 such as natural scaly graphite, pyrolytic graphite and quiche graphite are mixed with inorganic acids such as concentrated sulfuric acid, nitric acid and selenic acid, concentrated nitric acid, perchloric acid and perchlorate. In addition, a graphite intercalation compound is produced by treatment with a strong oxidant such as permanganate, dichromate, hydrogen peroxide, etc., and is a crystalline compound that maintains a carbon layered structure. It is preferable to use the heat-expandable graphite obtained by the acid treatment as described above, further 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. If the particle size is larger than 20 mesh, there is an advantage that the degree of expansion of graphite is large. In this case, dispersibility deteriorates, and physical properties are inevitably lowered. 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 add an inorganic filler to the thermally expandable resin composition.

  When the expanded heat insulating layer is formed, the inorganic filler increases the heat capacity and suppresses heat transfer, and works as an aggregate to improve the strength of the expanded 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 And water-containing inorganic substances 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, inorganic fillers include calcium salts such as calcium sulfate, gypsum fiber, calcium silicate; silica, diatomaceous earth, dosonite, 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 steel 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.

  As a particle size of an inorganic filler, 0.5-100 micrometers is preferable, More preferably, it is 1-50 micrometers. When the amount of the inorganic filler added is small, the dispersibility largely affects the performance, so that the particle size is preferably small. However, when the inorganic filler 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 moldability decreases as the high filling progresses, but the viscosity of the resin composition can be decreased by increasing the particle size. A thing with a large diameter is preferable. When the particle size exceeds 100 μm, the surface properties of the molded body and the mechanical properties of the resin composition are lowered.

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

  In the heat-expandable resin composition, a phosphorus compound may be further added in addition to the above components in order to increase the strength of the expansion heat insulating layer and improve the fireproof performance. The phosphorus compound is not particularly limited. For example, red phosphorus; various phosphate 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, from the viewpoint of fire prevention performance, red phosphorus, ammonium polyphosphates, and compounds represented by the following chemical formula (1) are preferable, and ammonium phosphates 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 Represents 6 to 16 aryloxy groups.

  As red phosphorus, commercially available red phosphorus can be used, but from the viewpoint of safety such as moisture resistance and not spontaneously igniting during kneading, a material in which the surface of red phosphorus particles is coated with a resin is preferably used. The ammonium polyphosphates are not particularly limited, and examples thereof include ammonium polyphosphate and melamine-modified ammonium polyphosphate. 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, “FR CROS 484” and “FR CROS 487” manufactured by Budenheim Iberica.

  The compound represented by the chemical formula (1) is not particularly limited. For example, methylphosphonic acid, dimethyl methylphosphonate, diethyl methylphosphonate, ethylphosphonic acid, propylphosphonic acid, butylphosphonic acid, 2-methylpropylphosphonic acid, t- Butylphosphonic acid, 2,3-dimethyl-butylphosphonic acid, octylphosphonic acid, phenylphosphonic acid, dioctylphenylphosphonate, dimethylphosphinic acid, methylethylphosphinic acid, methylpropylphosphinic acid, diethylphosphinic acid, dioctylphosphinic acid, phenylphosphine Examples include acid, diethylphenylphosphinic acid, diphenylphosphinic acid, bis (4-methoxyphenyl) phosphinic acid and the like. 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.

  In addition, the resin composition has a phenolic, amine-based, sulfur-based antioxidant, metal harm-preventing agent, antistatic agent, stabilizer, cross-linking agent, lubricant, softener as long as its physical properties are not impaired. A pigment or the like may be added. Moreover, a general flame retardant may be added and fire prevention performance can be improved by the combustion suppression effect by a flame retardant.

  In the resin composition constituting the thermally expandable refractory material, the amount of thermally expandable graphite is preferably 10 to 300 parts by weight with respect to 100 parts by weight of the resin component. If the blending amount is 10 parts by weight or more, the volume of the volume expansion coefficient is large and the synthetic resin member constituting the resin sash can sufficiently fill the burned-out portion. Strength is maintained. The amount of thermally expandable graphite is more preferably 20 to 250 parts by weight.

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

  In a resin composition, when adding a phosphorus compound, the compounding quantity of a phosphorus compound is 30-300 weight part with respect to 100 weight part of resin components. When the blending amount is 30 parts by weight or more, the effect of improving the strength of the expanded heat insulating layer is sufficient, and when it is 300 parts by weight or less, the mechanical strength is maintained. The amount of the phosphorus compound is more preferably 40 to 250 parts by weight.

  Commercially available sheets that can be used as the refractory sheet 5 include, for example, Fibrok (registered trademark) manufactured by Sekisui Chemical Co., Ltd., which contains epoxy resin or butyl rubber as a resin component, and includes a phosphorus compound, thermally expandable graphite, an inorganic filler, and the like. Sheet-form molded product of inflatable resin composition), Sumitomo 3M Fire Barrier (sheet material comprising a resin composition containing chloroprene rubber and verculite, expansion coefficient: 3 times, thermal conductivity: 0.20 kcal / m · h · ° C., Mitsui Metal Paint Chemical Co., Ltd. medhihi cut (sheet material made of resin composition containing polyurethane resin and thermally expandable graphite, expansion coefficient: 4 times, thermal conductivity: 0.21 kcal / m · h) -° C).

  According to the fireproof structure 1 of the first embodiment, since the fireproof sheet 5 covers the opening at one end of the sleeve 3 in a state where the pipe 3 and the wiring are not inserted through the sleeve 3, the pipe 3 and the wiring are connected to the sleeve 3. Even if a fire occurs before being inserted, it is possible to prevent heat and disaster from being transmitted through the sleeve 3. Therefore, it is possible to prevent the spread of fire through the sleeve 3.

  Specifically, when a fire occurs on the fire prevention section B side where the fireproof sheet 5 is arranged, the fireproof sheet 5 blocks the flame, so that heat and flame do not enter the sleeve 3, and the fire prevention section B Heat, flames and smoke are prevented from entering the fire prevention section A through the sleeve 3. For this reason, it is possible to prevent fire spread through the sleeve 3.

  In addition, when a fire occurs on the fire prevention section A side where the fireproof sheet 5 is not disposed, the temperature and pressure in the room rise due to the fire, and heat and flame will propagate to the fire prevention section B through the sleeve 3. And However, since the opening of the sleeve 3 on the fire prevention section B side is closed by attaching the fireproof sheet 5 to the fire prevention section B side of the sleeve 3, the inside of the sleeve 3 is in an oxygen deficient state. And the supply of the amount of heat is suppressed. For this reason, it is possible to prevent fire spread through the sleeve 3.

  Furthermore, when the refractory sheet 5 is formed from a thermally expandable material, the refractory sheet 5 is thermally expanded to form an expanded heat insulating layer, and this expanded heat insulating layer closes the opening of the sleeve 3, Heat and flame can be prevented from propagating through the sleeve 3.

  Further, the metal wire 9 is wound around the outer peripheral portion 5b of the refractory sheet 5 along the side surface of the sleeve 3, so that the refractory sheet 5 can be easily attached to the sleeve even when the diameter of the sleeve 3 is small. 3 can be attached.

  Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a cross-sectional view showing the fireproof structure 10 according to the second embodiment.

  The fireproof structure 10 according to the second embodiment includes a partition 2, a cylindrical sleeve 3, a fireproof sealing material 4, and a pair of fireproof sheets 5A and 5B. The division body 2, the sleeve 3, and the fireproof sealing material 4 are the same as those in the first embodiment. Therefore, the description is omitted.

  The pair of fireproof sheets 5A and 5B cover one opening of the sleeve 3 (opening on the fireproof section B side of the sleeve 3) in a state where no wiring or piping is inserted through the sleeve 3 as shown in FIG. is there.

  In a state where no wiring or piping is inserted through the sleeve 3 (in the state shown in FIG. 2), the ends 5c, 5c of the fireproof sheets 5A, 5B are bound together by a metal wire 11. The fire-resistant sheets 5A and 5B have one end side portions 5d and 5d covering the opening of the sleeve 3, and the other end-side portions 5e and 5e of the fire-resistant sheets 5A and 5B are along the outer peripheral surface of the sleeve 3. The sheets 5 </ b> A and 5 </ b> B are disposed with respect to the sleeve 3. Furthermore, the fireproof sheets 5A and 5B are pressed against the sleeve 3 by winding the metal wire 12 around the other end portions 5e and 5e of the fireproof sheets 5A and 5B.

  In a state where no wiring or the like is inserted into the sleeve 3 described above (in the state of FIG. 2), the fireproof sheets 5A and 5B cover one opening of the sleeve 3 (opening on the fireproof section B side of the sleeve 3). . For this reason, even if a fire occurs before the piping or wiring is inserted into the sleeve 3, it is possible to prevent heat and fire from being transmitted through the sleeve 3. For this reason, it is possible to prevent fire spread through the sleeve 3.

FIG. 3 shows an operation of inserting the wiring 12 through the sleeve 3. When the wiring 12 is inserted through the sleeve 3, the following operations (i) to (iv) are sequentially performed.
(I) By removing the metal wire 11 from the fireproof sheets 5A and 5B, the binding between the ends 5c and 5c of the fireproof sheets 5A and 5B is released (FIG. 3A).
(Ii) The wiring 12 is inserted into the sleeve 3, and the wiring 12 is passed between the one ends 5c and 5c of the fireproof sheets 5A and 5B (FIG. 3B).
(Iii) One ends 5c and 5c of the fireproof sheets 5A and 5B are placed along the wiring 12 (FIG. 3C).
(Iv) The metal wire 11 is wound around the one ends 5c and 5c of the fireproof sheets 5A and 5B (FIG. 3C).

  After the wiring 12 is inserted into the sleeve 3 and the state shown in FIG. 3C is obtained by the above operations (i) to (iv), the tension-resistant sheets 5A and 5B are connected to the wiring 12 and the sleeve. Covers the gap between the three. For this reason, when a fire occurs, it is possible to prevent heat and disaster from propagating from between the wiring 12 and the sleeve 3. Therefore, it is possible to prevent the spread of fire through the sleeve 3. Note that the same operations as in the above (i) to (iv) are also performed when the pipe is inserted into the sleeve 3.

  According to the second embodiment, by performing the simple operations (i) to (iv) described above, it is possible to realize a measure for suppressing the risk of fire spread immediately after the wiring or piping is inserted into the sleeve 3. Therefore, convenience is high. Further, even if a fire occurs at any time before or after the wiring or the like is inserted into the sleeve 3, it is possible to prevent the fire from spreading through the sleeve 3.

  In addition, this invention is not limited to embodiment mentioned above, A various change can be made.

  For example, in the first and second embodiments, an example in which the opening on the fireproof section B side of the sleeve 3 is covered with the fireproof sheets 5, 5 </ b> A, 5 </ b> B is shown, but the opening on the fireproof section B side of the sleeve 3 is the fireproof sheet. 5, 5A, 5B may be covered, and both openings of the sleeve 3 may be covered with the refractory sheets 5, 5A, 5B. In addition, in the case where only one of the openings of the sleeve 3 is covered with the refractory sheets 5, 5A, 5B, the construction on the other side where the refractory sheets 5, 5A, 5B are not arranged, The fireproof sheets 5, 5A, 5B do not hinder. Therefore, the construction on the other side can be performed smoothly.

  Moreover, the metal wires 9, 11, and 12 used in the first and second embodiments may be covered with a coating material for rust prevention or the like.

  In the first and second embodiments, the partition body is an example of a hollow wall made of gypsum board. However, the partition body is a lightweight cellular concrete (ALC) wall, a wall formed faithfully with mortar, or the like. Any other wall may be used, and the wall is not limited to the wall extending in the vertical direction, and may be a floor or a plate extending in the horizontal direction.

  FIG. 4 is a cross-sectional view showing a modification in which the partition 2 is a floor extending in the horizontal direction. Fig.4 (a) shows the modification of the fireproof structure 1 of 1st Embodiment, FIG.4 (b) shows the modification of the fireproof structure 10 of 2nd Embodiment. In the modification shown in FIG. 4A and FIG. 4B, the upper section C and the lower section D are partitioned by the partition 2. A through passage 8 extending in the vertical direction is formed in the partition body 2. A sleeve 3 is installed in the through-passage 8, and a refractory sealing material 4 is filled between the housing surface of the through-passage 8 and the outer peripheral surface of the sleeve 3. 4A, the opening at the upper end of the sleeve 3 is covered with the fireproof sheet 5 in a state where no piping or wiring is inserted through the sleeve 3. 4B, the opening at the upper end of the sleeve 3 is covered with a pair of fire-resistant sheets 5A and 5B in a state where no piping or wiring is inserted through the sleeve 3. According to the modification shown in FIG. 4A and FIG. 4B, the opening of the upper end of the sleeve 3 is covered with the fireproof sheet 5 and the fireproof sheets 5A and 5B. Even if a fire occurs in one of the sections C and D until the wiring is inserted, heat and fire can be prevented from being propagated through the sleeve 3 to the other of the sections C and D. For this reason, it is possible to prevent fire spread through the sleeve 3. 4A and 4B, the opening at the lower end of the sleeve 3 may be covered with the fireproof sheets 5, 5A, 5B, and both the upper end and the lower end of the sleeve 3 may be covered. The opening may be covered with fireproof sheets 5, 5A, 5B.

DESCRIPTION OF SYMBOLS 1,10 Fire prevention structure 2 Compartment 3 Sleeve 4 Fireproof sealing material 5,5A, 5B Fireproof sheet 5a Center part of fireproof sheet 5b Outer part of fireproof sheet 5c One end of fireproof sheet 5d One end side of fireproof sheet Part 5e The other end of the refractory sheet 8 Through-path 9, 11, 12 Metal wire

Claims (2)

A cylindrical sleeve installed in the through-passage of the compartment;
A fireproof sheet covering at least one of the openings at both ends of the sleeve ;
The fireproof sheet is disposed with respect to the sleeve so that the center of the fireproof sheet covers the opening of the sleeve and the outer periphery of the fireproof sheet is along the side of the sleeve;
A sleeve with a sheet, wherein the fire-resistant sheet is pressed against the sleeve by winding a metal wire around an outer periphery of the fire-resistant sheet . A cylindrical sleeve installed in the through-passage of the compartment;
A fireproof sheet covering at least one of the openings at both ends of the sleeve;
A pair of the fireproof sheets, one end of which is bound with a first metal wire,
The pair of refractory sheets are in contact with the sleeve so that one end side of the pair of refractory sheets covers the opening of the sleeve and the other end side of the pair of refractory sheets is along the side of the sleeve. Arranged,
The sleeve with a sheet | seat by which the said 2nd metal wire is wound around the said sleeve by the 2nd metal wire being wound around the other end side part of a pair of said fireproof sheet.

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