JP6010427B2 - Through-hole insertion cylinder for use in outlet box and fire prevention structure using the same - Google Patents

Description

  The present invention relates to a through-hole insertion cylinder for use in an outlet box and a fire prevention structure using the same.

Many outlets and switches installed inside the walls of buildings such as hollow walls contain plastic parts, so when a fire breaks out, these outlets and switches melt and deform, and the flame of the fire is May penetrate the inside of the wall.
When a fire flame enters the inside of a wall such as a hollow wall, there is a problem that the fire spreads through the electric cables connected to an outlet or a switch.
In order to cope with this problem, there has been proposed a fire prevention structure in which an outlet box is provided on the back of an outlet, a switch, or the like provided in a room, that is, inside a wall such as a hollow wall.

FIG. 16 is a schematic cross-sectional view for explaining a conventional fire prevention structure of an outlet box.
A through hole is provided in the walls 40 and 40 forming the hollow wall, and the outlet box 1 is installed so as to cover the through hole from the inside of the walls 40 and 40. The outlet box 1 has a metal box shape having an opening. The outlet box 1 attached to a stud (not shown) with a metal fitting or the like is installed inside the walls 40 and 40 with the opening of the outlet box 1 facing the through hole of the walls 40 and 40. ing.
An insertion hole is provided in the upper surface of the outlet box 1, and the electric cables 50 are inserted through the insertion hole. A fire spread prevention portion 30 made of a thermally expandable resin composition is provided outside the outlet box 1 so as to be in close contact with the outer periphery of the electric cables 50. The fire spread prevention part 30 is exposed inside the outlet box 1 and closes the insertion hole of the outlet box 1 and the electric cables 50.
The ends of the electric cables 50 are connected to a wiring terminal 74. Further, a holding frame 73 holding the wiring terminal 74 is attached to the walls 40 and 40.
According to the conventional fire prevention structure of the outlet box, it is said that the fire spread can be prevented even when the outlet box is exposed to a flame such as a fire (Patent Document 1).

JP 2009-055697 A

However, as a result of repeated studies by the present inventors, it was discovered that there are the following problems.
Although the outlet box 1 is attached to the stud, it is not completely fixed to the inside of the walls 40, 40. If the outlet box 1 is pushed from the outside of the through hole, the outlet box 1 is May move slightly.
For this reason, even if it tried the operation | work of screwing etc. from the opposite side of the said wall 40 with respect to the said outlet box 1, since the said outlet box 1 moved, there existed a problem which requires time for operations, such as screwing.

  Further, the powdery contents of the wall 40 are shaved and exposed on the inner surface of the through hole provided in the wall 40. For this reason, there is a problem that it is difficult to install an adhesive refractory on the inner surface of the through hole.

  Further, since the electric cables inserted through the inside of the outlet box come into contact with the inner surface of the through hole provided in the wall 40, the inside of the switchboard or the like to which the electric cables are connected by the powdery contents of the wall 40 There was also a problem of getting dirty. In particular, in the case of electric wires and cables used for precise applications, there is a possibility that the performance required in the design cannot be sufficiently exhibited due to the dirt and moisture inside the switchboard etc. as a trigger.

  An object of the present invention is to be used for an outlet box that can facilitate the wiring work of electric cables to the outlet box, can maintain the reliability of the electric cables, and has excellent fire resistance. It is in providing the through-hole insertion cylinder of this.

  As a result of intensive studies by the present inventors in order to solve the above-described problems, a through-hole insertion tube obtained by cutting a through-hole insertion tube having a groove portion on the outer periphery along the groove portion is suitable for the object of the present invention. As a result, the present invention has been completed.

That is, the present invention
[1] A through-hole insertion cylinder for use in an outlet box,
A through hole through tube equipped with a groove on the outer circumference, resulting et been cut along the groove,
Two or more groove portions of the through-hole insertion tube are installed at intervals along the outer periphery of the through-hole insertion tube,
A through-hole insertion cylinder provided with a thermally expandable refractory resin layer is provided .

One of the present invention is
[ 2 ] The through-hole insertion cylinder according to [ 1 ] above, wherein the through-hole insertion cylinder provided with the thermally expandable refractory resin layer is at least one of the following (1) to (3). .
(1) A through-hole insertion cylinder provided with a cylindrical thermal expansion refractory resin layer on at least one end face of the cylindrical synthetic resin layer. (2) A cylindrical synthetic resin layer is provided at both ends of the cylindrical thermal expansion refractory resin layer. Through-hole insertion cylinder (3) Through-hole insertion cylinder made of a cylindrical thermally expandable refractory resin layer

The present invention also provides
[ 3 ] An outlet box fire prevention structure using the through-hole insertion tube according to [ 1 ] or [ 2 ],
The outlet box is installed so as to cover the through hole with respect to the wall having the through hole,
The outlet box has a space surrounded by a back plate and a side plate joined to the outer periphery of the back plate, and is installed on the wall with the opening side of the outlet box facing the wall,
Wire cables are inserted through an insertion hole formed in at least one of the back plate and the side plate of the outlet box,
The through hole insertion cylinder is installed inside the through hole of the wall,
The outlet box and the through-hole insertion tube are connected to each other, and the fire prevention structure for the outlet box is provided.

One of the present invention is
[ 4 ] The outlet box is a combination of an outlet box body and a gutter having an opening, which is detachable.
A gutter having the opening is installed on the opening side of the outlet box body,
The support frame is installed outside the through hole of the wall opposite to the side where the outlet box is installed,
The through hole insertion cylinder is installed inside the through hole of the wall,
One end surface of the through-hole insertion tube is connected to a plate having the opening,
The other end face of the through-hole insertion tube is connected to the support frame, and provides the fire prevention structure for the outlet box according to the above [ 3 ].

One of the present invention is
[ 5 ] The fireproof structure for an outlet box according to the above [ 3 ] or [ 4 ], wherein a thermally expandable fireproof sheet is installed inside the through-hole insertion tube.

One of the present invention is
[ 6 ] The wire cables are inserted through the inside of the flexible wire tube having a cylindrical fixing device installed at the end,
A cylindrical fixed receiver is installed in the insertion hole of the outlet box,
The support frame is installed outside the through hole of the wall opposite to the side where the outlet box is installed,
A cylindrical fixture installed at the end of the flexible conduit is fitted to a cylindrical fixture installed in the insertion hole of the outlet box,
A switchboard is installed on the support frame,
The wire cables inserted through the inside of the flexible conduit are introduced into the outlet box and connected to the switchboard,
The switchboard includes at least one selected from the group consisting of a wired communication outlet, a power outlet, a power switch, a power breaker, a power indicator, and an information display device,
The switchboard and the support frame are covered from the outside of the wall by a decorative plate, and a power outlet, a power switch, and a power breaker of the switchboard can be operated through the opening of the decorative plate, The fire prevention structure for an outlet box according to any one of [3] to [5] above, in which an indicator lamp and an information display device can be visually recognized.

A through-hole insertion cylinder for use in the outlet box of the present invention is connected to the outlet box, and the through-hole insertion cylinder is installed inside the through-hole of the wall so as to be opposite to the wall on which the outlet box is installed. A support frame or the like installed on the side can be easily connected to the through-hole insertion cylinder.
Moreover, the powdery contents of the wall 40 may be scraped and exposed on the inner surface of the through hole provided in the wall 40. Occurrence of the problem that the inside of the outlet box, the electric cables, the switchboard and the like are soiled by the powdery contents can be prevented.

  Moreover, the said through-hole penetration cylinder is obtained by cut | disconnecting the through-hole penetration pipe | tube provided with the groove part in the outer periphery along the said groove part. For this reason, even when the length of the through hole in the wall changes depending on the position of the wall, the through hole insertion tube corresponding to the length of the through hole can be obtained at the construction site, so that the workability is excellent.

Moreover, the through-hole insertion cylinder provided with the thermally expandable refractory resin layer forms an expansion residue when exposed to heat such as a fire.
For this reason, the fireproof structure of the outlet box having the through-hole insertion cylinder provided with the thermally expandable fireproof resin layer is excellent in fire resistance.

FIG. 1 is a schematic perspective view for explaining a through-hole insertion tube used in the present invention. FIG. 2 is a schematic side view for explaining the through-hole insertion tube used in the present invention. FIG. 3 is a schematic perspective view for explaining the through-hole insertion cylinder according to the present invention. FIG. 4 is a schematic view illustrating a cross section obtained by cutting the through hole insertion tube perpendicularly to the axis of the through hole insertion tube. FIG. 5 is a schematic diagram showing a modification of the cross section of the through-hole insertion tube. FIG. 6 is a schematic view showing a modification of the cross section of the through-hole insertion tube. FIG. 7 is a schematic perspective view illustrating an outlet box used in the present invention. FIG. 8 is a schematic perspective view illustrating an outlet box used in the present invention. FIG. 9 is a schematic perspective view illustrating the through-hole inserting cylinder body used in the first embodiment. FIG. 10 is a schematic perspective view illustrating the through-hole insertion cylinder according to the first embodiment. FIG. 11 is a schematic perspective view illustrating the through hole insertion cylinder 110 according to the second embodiment. FIG. 12 is a schematic perspective view illustrating the through hole insertion cylinder 120 according to the third embodiment. FIG. 13 is a schematic perspective view illustrating the through hole insertion cylinder 130 according to the fourth embodiment. FIG. 14 is a schematic perspective view illustrating the through-hole insertion tube 140 according to the fifth embodiment. FIG. 15 is a schematic cross-sectional view of an essential part for explaining an outlet box fire prevention structure 500 according to a sixth embodiment. FIG. 16 is a schematic cross-sectional view for explaining a conventional fire prevention structure of an outlet box.

First, the through-hole insertion tube used in the present invention will be described.
FIG. 1 is a schematic perspective view for explaining a through-hole insertion tube used in the present invention. FIG. 2 is a schematic side view for explaining the through-hole insertion tube used in the present invention.
The through-hole insertion tube 400 includes a groove portion 402 on the outer periphery. The groove portion 402 extends along the outer periphery of the through-hole insertion tube 400 at a position where a vertical plane with respect to the direction of the axis of the through-hole insertion tube 400 (dotted line AA) intersects with the outer surface of the through-hole insertion tube 400. Several are installed.
The groove portion 402 may be installed continuously or intermittently on the outer periphery of the through-hole insertion tube 400, but the through-hole insertion tube 400 is simply cut along the groove portion 402. It is preferable to install continuously on the outer periphery of the through-hole insertion tube 400 so as to be able to.
In addition, the thickness of the groove 402 is preferably in the range of 50 μm to 5 mm in order to facilitate the cutting of the through hole insertion tube 400. This range is more preferably in the range of 100 μm to 3 mm, and even more preferably in the range of 200 μm to 2 mm.

The outer surface portions 403 of the through-hole insertion tube 400 other than the groove portions 402 installed in the through-hole insertion tube 400 are alternately installed with the groove portions 402.
The width of the groove portion 402 and the outer surface portion 403 of the through-hole insertion tube 400 is preferably in the range of 1 to 20 mm, more preferably in the range of 2 to 10 mm, and more preferably in the range of 3 to 7 mm. More preferred.
In the case of the through-hole insertion tube 400 shown in FIG. 1, the width of the groove 402 and the outer surface portion 403 of the through-hole insertion tube 400 are the same length with respect to the axial direction of the through-hole insertion tube 400. . The widths of the groove portion 402 and the outer surface portion 403 of the through-hole insertion tube 400 can be appropriately set according to applications.

FIG. 3 is a schematic perspective view for explaining the through-hole inserting tube according to the present invention, and FIG. 4 is a cross-sectional view of the through-hole inserting tube 400 cut perpendicularly with respect to the axis of the through-hole inserting tube 400. The through-hole insertion cylinder main body 101 is obtained by cutting the through-hole insertion tube 400. The through-hole insertion cylinder body 101 is entirely made of a cylindrical synthetic resin layer, and the through-hole insertion cylinder body 101 can be used as a through-hole insertion cylinder as it is.
The thickness of the through-hole insertion tube 400 illustrated in FIG. 3 (excluding the groove portion 402) is preferably in the range of 1 to 20 mm, more preferably in the range of 2 to 10 mm, and in the range of 3 to 7 mm. More preferably.
Moreover, the outer diameter of the through-hole insertion tube 400 illustrated in FIG. 4 is preferably in the range of 10 to 500 mm, more preferably in the range of 20 to 200 mm, and further in the range of 30 to 100 mm. preferable.

  Further, inside the through-hole insertion tube 400, connecting member receiving portions 404 and 404 for installing a connecting member for connecting an outlet box to be described later and a support frame or the like are installed. By installing a connecting member in each of the connecting member receiving portions 404, 404, the connecting member can be easily connected to an outlet box or the like (not shown).

FIG. 5 and FIG. 6 are schematic views showing modifications of the cross section of the through hole insertion tube 400 illustrated in FIG.
The cross-sectional shape of the through-hole insertion tube 400 used in the present invention is not limited to the shape formed by the two curved surfaces opposed to each other illustrated in FIG. 4 and the planes opposed to each other, for example, from the curved surface illustrated in FIG. Or a shape close to a polygon including a curved surface.
Moreover, as illustrated in FIG. 6, the number and installation positions of the connecting member receiving portions 404 and 404 can be appropriately changed according to the purpose and use of the through hole insertion tube 400 to be used.

Next, the raw material of the through hole insertion tube 400 used in the present invention will be described.
The raw material of the through-hole insertion tube 400 used in the present invention is not particularly limited as long as it can be cut along the groove portion 402.
Examples of the raw material of the through-hole insertion tube 400 include a resin composition containing an organic material, an inorganic material, and the like.

  Although there is no limitation in the organic material contained in the said resin composition, if an example is given, a thermoplastic resin, a thermosetting resin, etc. will be mentioned, for example.

Specific examples of the thermoplastic resin include polyolefin resins such as polyethylene resin, polypropylene resin, and polypentene resin, silicone resin, polysulfide resin, polystyrene resin, ABS resin, polycarbonate resin, polyphenylene ether resin, acrylic resin, and polyamide. Resin, polyvinyl chloride resin, polyalkylene ether resin, polyethylene terephthalate resin, polybutylene terephthalate resin,
Natural rubber, butyl rubber, silicone rubber, polychloroprene rubber, polybutadiene rubber, polyisoprene rubber, polyisobutylene rubber, styrene / butadiene rubber, butadiene / acrylonitrile rubber, nitrile rubber, ethylene / α-propylene / diene copolymer, etc. Examples thereof include rubber resins such as olefin copolymer rubber.

Moreover, as said thermosetting resin, an epoxy resin, a polyurethane resin, a polyphenol resin etc. are mentioned, for example.
When using the said thermosetting resin, the prepolymer which reacted the monomer used as the raw material of a thermosetting resin preliminarily can be used.
The said thermosetting resin can use 1 type, or 2 or more types.

Among the organic components used in the present invention, polyolefin resin, rubber resin, urethane resin, and epoxy resin are preferable, and urethane resin and epoxy resin are more preferable.
When an epoxy resin is used, it is more preferable because the deformation temperature when the through-hole insertion tube 400 is heated is high.

As said urethane resin, what is obtained by making isocyanate and polyhydric alcohol react is mentioned, for example.
Examples of the isocyanates include phenylene diisocyanate, toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), naphthalene diisocyanate, dimethyldiphenylmethane diisocyanate, and the like.
Examples of the polyhydric alcohol include polyoxyalkylene polyol, polyester polyol, polyolefin polyol, and acrylic polyol.

  Examples of the epoxy resin include resins obtained by reacting a monomer having an epoxy group with a curing agent.

  Examples of the monomer having an epoxy group include, as a bifunctional glycidyl ether type, a polyethylene glycol type, a polypropylene glycol type, a neopentyl glycol type, a 1,6-hexanediol type, a trimethylolpropane type, and a propylene oxide-bisphenol A. And monomers such as hydrogenated bisphenol A type, bisphenol A type, and bisphenol F type.

  Examples of the glycidyl ester type include monomers such as hexahydrophthalic anhydride type, tetrahydrophthalic anhydride type, dimer acid type, and p-oxybenzoic acid type.

  Further, examples of the polyfunctional glycidyl ether type include monomers such as phenol novolac type, orthocresol type, DPP novolac type, dicyclopentadiene, and phenol type.

  These can use 1 type, or 2 or more types.

Examples of the curing agent include a polyaddition type curing agent and a catalyst type curing agent.
Examples of the polyaddition type curing agent include polyamines, acid anhydrides, polyphenols, polymercaptans, and the like.

  Examples of the catalyst-type curing agent include tertiary amines, imidazoles, and Lewis acid complexes. The method for curing these epoxy resins is not particularly limited, and can be performed by a known method.

  In addition, what adjusted the melt viscosity of the said resin component, a softness | flexibility, adhesiveness, etc. can use what mixed 2 or more types of resin components.

Next, the inorganic material will be described.
Specific examples of the inorganic material used as the raw material of the through-hole insertion tube 400 include an inorganic filler.
The inorganic filler is not particularly limited. For example, silica, diatomaceous earth, alumina, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, iron oxide, tin oxide, antimony oxide, ferrites, calcium hydroxide, hydroxide Magnesium, aluminum hydroxide, basic magnesium carbonate, calcium carbonate, magnesium carbonate, zinc carbonate, barium carbonate, dosonite, hydrotalcite, calcium sulfate, barium sulfate, gypsum fiber, potassium silicate and other potassium salts, talc, clay, Mica, montmorillonite, bentonite, activated clay, ceviolite, imogolite, sericite, glass fiber, glass beads, silica-based balun, aluminum nitride, boron nitride, silicon nitride, carbon black, graphite, carbon fiber, carbon bal , Charcoal powder, various metal powders, potassium titanate, magnesium sulfate, lead zirconate titanate, aluminum borate, molybdenum sulfide, silicon carbide, stainless steel fiber, zinc borate, various magnetic powders, slag fiber, fly ash, inorganic phosphorus Compound, silica alumina fiber, alumina fiber, silica fiber, zirconia fiber and the like can be mentioned.

  These can use 1 type, or 2 or more types.

A heat-expandable resin composition layer can be installed in the through-hole insertion tube 400.
As the thermally expandable resin composition layer, for example, with respect to the resin composition including the organic material and the inorganic material described above, a thermally expandable resin composition including a phosphorus compound, a thermally expandable component, etc. as an inorganic material And the like.

The phosphorus compound is not particularly limited, and examples thereof include red phosphorus,
Various phosphate esters such as triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresyl diphenyl phosphate, xylenyl diphenyl phosphate,
Metal phosphates such as sodium phosphate, potassium phosphate, magnesium phosphate,
Ammonium polyphosphates,
The compound etc. which are represented by Chemical formula 1 are mentioned.

  These phosphorus compounds can be used alone or in combination of two or more.

  Among these, from the viewpoint of fire resistance, red phosphorus, a compound represented by the following chemical formula, and ammonium polyphosphates are preferable, and ammonium polyphosphates are more preferable in terms of performance, safety, cost, and the like.

上記化学式中、Ｒ^１及びＲ^３は、水素、炭素数１〜１６の直鎖状若しくは分岐状のアルキル基、又は、炭素数６〜１６のアリール基を表す。

In the above chemical formula, R ¹ and R ³ represent hydrogen, a linear or branched alkyl group having 1 to 16 carbon atoms, or an aryl group having 6 to 16 carbon atoms.

R ² 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 carbon. The aryloxy group of Formula 6-16 is represented.

  Examples of the compound represented by the chemical formula include 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, phenylphosphinic 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 ammonium polyphosphates are not particularly limited, and examples thereof include ammonium polyphosphate and melamine-modified ammonium polyphosphate. Ammonium polyphosphate is preferable from the viewpoint of flame retardancy, safety, cost, and handleability.

  Examples of commercially available products include “trade name: EXOLIT AP422” and “trade name: EXOLIT AP462” manufactured by Clariant.

  It is considered that the phosphorus compound reacts with metal carbonates such as calcium carbonate and zinc carbonate to promote the expansion of the metal carbonate. In particular, when ammonium polyphosphate is used as the phosphorus compound, a high expansion effect is obtained. can get. It also acts as an effective aggregate and forms a highly shape-retaining residue after combustion.

Next, the thermal expansion component will be described.
The thermal expansion component expands upon heating, but the thermal expansion component is not particularly limited, and examples thereof include thermal expansion layered inorganic materials such as vermiculite, kaolin, mica, and thermal expansion graphite.

  The thermally expandable graphite is a conventionally known substance, and powders such as natural scaly graphite, pyrolytic graphite, quiche graphite, etc., inorganic acid such as concentrated sulfuric acid, nitric acid, selenic acid, concentrated nitric acid, perchloric acid, Crystalline compound that maintains a carbon layered structure by generating a graphite intercalation compound by treatment with a strong oxidant such as perchlorate, permanganate, dichromate, or hydrogen peroxide. It is a kind of.

  The heat-expandable graphite obtained by acid treatment as described above is preferably further neutralized with ammonia, an aliphatic lower amine, an alkali metal compound, an alkaline earth metal compound, or the like.

  Examples of the aliphatic lower amine include monomethylamine, dimethylamine, trimethylamine, ethylamine, propylamine, and butylamine.

  Examples of the alkali metal compound and the alkaline earth metal compound include hydroxides such as potassium, sodium, calcium, barium, and magnesium, oxides, carbonates, sulfates, and organic acid salts.

  The thermal expandable graphite preferably has a particle size in the range of 20 to 200 mesh.

  When the particle size is smaller than 20 mesh, the degree of expansion of graphite is small, and it is difficult to obtain a sufficient expansion residue. When the particle size is larger than 200 mesh, there is an advantage that the degree of expansion of graphite is large. Or when knead | mixing with an epoxy resin, a dispersibility worsens and a physical property falls easily.

Examples of commercially available neutralized thermally expandable graphite include “GRAFGUARD # 160”, “GRAFGUARD # 220” manufactured by UCAR CARBON, and “GREP-EG” manufactured by Tosoh Corporation.

  The inorganic filler used in the thermally expandable resin composition layer preferably plays an aggregate role and contributes to an improvement in the strength of expansion residue generated after heating and an increase in heat capacity.

  Specifically, metal carbonates represented by calcium carbonate and zinc carbonate, aluminum hydroxide that gives an endothermic effect during heating in addition to the role of aggregate, and water-containing inorganic materials represented by magnesium hydroxide are preferred, and alkali metals , Alkaline earth metals, and metal carbonates of the Periodic Table IIb or a mixture of these and the hydrated inorganic substance are preferred.

  When the inorganic filler used in the present invention is granular, the particle size is preferably in the range of 0.5 to 200 μm, more preferably in the range of 1 to 50 μm.

  When the amount of the inorganic filler added is small, the dispersibility largely affects the performance, so that a small particle size is preferable. However, when the particle size is 0.5 μm or more, secondary aggregation can be prevented, and the dispersibility It can prevent getting worse.

  In addition, when the amount of inorganic filler added is large, the viscosity of the resin composition increases and moldability decreases as high filling proceeds, but the viscosity of the resin composition is decreased by increasing the particle size. From the point of being able to do, the thing with a large particle size is preferable among the said range.

  In addition, if a particle size is 200 micrometers or less, it can prevent that the surface property of a molded object and the mechanical physical property of a resin composition fall.

Among the inorganic fillers, calcium carbonate, zinc carbonate and other metal carbonates that play an aggregate role in particular,
Aluminum hydroxide that gives an endothermic effect during heating in addition to the aggregate role,
A hydrous inorganic material such as magnesium hydroxide is preferred.

  It is considered that the combined use of the hydrated inorganic substance and the metal carbonate greatly contributes to improving the strength of the combustion residue and increasing the heat capacity.

  Among the inorganic fillers, in particular, water-containing inorganic substances such as aluminum hydroxide and magnesium hydroxide are endothermic due to the water generated by the dehydration reaction during heating, and the temperature rise is reduced and high heat resistance is obtained. This is preferable in that the oxide remains as a combustion residue and this acts as an aggregate to improve the strength of the combustion residue.

  Magnesium hydroxide and aluminum hydroxide have different temperature ranges that exhibit dehydration effects, so when used together, the temperature range that exhibits dehydration effects becomes wider, and more effective temperature rise suppression effects can be obtained. It is preferable to do.

  When the particle size of the water-containing inorganic substance is small, the bulk increases and it becomes difficult to achieve high filling. Therefore, in order to increase the dehydration effect, a large particle size is preferable. Specifically, it is known that when the particle size is 18 μm, the filling limit amount is improved by about 1.5 times compared to the particle size of 1.5 μm. Further, by combining a large particle size and a small particle size, higher packing can be achieved.

  As a commercial item of the said water-containing inorganic substance, for example, as aluminum hydroxide, “trade name: Hygielite H-42M” (manufactured by Showa Denko) with a particle diameter of 1 μm, “trade name: Hygilite H-31 with a particle diameter of 18 μm”. (Made by Showa Denko KK) and the like.

  Examples of commercially available calcium carbonate include “trade name: Whiten SB red” (manufactured by Shiraishi Calcium Co., Ltd.) having a particle size of 1.8 μm, and “trade name: BF300” (manufactured by Bihoku Flourishing Co., Ltd.) having a particle size of 8 μm Etc.

  Next, blending of a resin composition containing an organic material, an inorganic material, etc., and a thermally expandable resin composition containing a phosphorus compound, a thermal expansion component, etc. as an inorganic material to the resin composition will be described.

The resin composition preferably contains 50 to 400 parts by weight of the inorganic material with respect to 100 parts by weight of the organic material.
The thermally expandable resin composition preferably contains 20 to 350 parts by weight of the thermal expansion component and 50 to 400 parts by weight of the inorganic material with respect to 100 parts by weight of the organic material. The total of the thermal expansion component and the inorganic material is preferably in the range of 200 to 600 parts by weight.

  Such a heat-expandable resin composition expands by heating to form an expansion residue. According to this composition, the thermally expandable resin composition expands by heating such as a fire, and can obtain a necessary volume expansion coefficient. After expansion, a residue having a predetermined heat insulation performance and a predetermined strength is obtained. It can be formed, and stable fireproof performance can be achieved.

When the amount of the thermal expansion component is 20 parts by weight or more, the expansion ratio is improved, and sufficient fire resistance and fire prevention performance can be obtained.
On the other hand, when the amount of the thermal expansion component is 350 parts by weight or less, the pseudo-collecting force is improved, so that the strength of the molded product is increased.
Moreover, since the residual volume after combustion can be ensured as the amount of the inorganic material is 50 parts by weight or more, a sufficient expansion residue can be obtained. Furthermore, since the ratio of combustibles decreases, flame retardance improves.

  On the other hand, when the amount of the inorganic material is 400 parts by weight or less, the blending ratio of the organic material is increased and sufficient cohesive force is obtained, so that the strength as a molded product can be ensured.

  When the total amount of the thermal expansion component and the inorganic material in the thermally expandable resin composition is 200 parts by weight or more, the amount of residue after combustion can be ensured and sufficient fireproof performance is obtained, and is 600 parts by weight or less. It can prevent deterioration of mechanical properties and can withstand long-term use.

  Furthermore, the resin composition and the heat-expandable resin composition used in the present invention are within the range that does not impair the object of the present invention, and if necessary, phenolic, amine-based, sulfur-based antioxidants, etc. In addition, additives such as metal damage inhibitors, antistatic agents, stabilizers, crosslinking agents, lubricants, softeners, pigments, and tackifiers such as polybutenes and petroleum resins can be included.

Next, the manufacturing method of the said resin composition or a thermally expansible resin composition is demonstrated.
The thermal expandable resin composition and the method for producing the thermally expandable resin composition are not particularly limited. For example, the thermal expandable resin composition or the thermally expandable resin composition is suspended in an organic solvent, respectively. , A method of heating and melting to form a paint, a method of preparing a slurry by dispersing in a solvent, etc., melting the thermally expandable resin composition or the thermally expandable resin composition under heating The said thermally expansible resin composition or the said thermally expansible resin composition can be obtained by methods, such as.

  The heat-expandable resin composition or the heat-expandable resin composition is a known single-screw extruder, twin-screw extruder, Banbury mixer, kneader mixer, kneading roll, lykai machine, planetary stirrer, etc. Each can be obtained by kneading using an apparatus.

  In addition, when using a thermosetting resin as the organic material of the thermally expandable resin composition, the filler is separately kneaded into the thermoplastic resin monomer and the curing agent, and a static mixer immediately before molding, It can also be obtained by kneading with a dynamic mixer or the like.

  By the method demonstrated above, the said resin composition or the said thermally expansible resin composition used for this invention can be obtained. The through-hole insertion tube 400 can be obtained by a method such as melt extrusion or hot press molding of the resin composition or the thermally expandable resin composition.

Next, the outlet box used in the present invention will be described.
7 and 8 are schematic perspective views illustrating an outlet box used in the present invention.
An outlet box main body 1a is formed by joining the upper side plate 2, the lateral side plate 3 and the lower side plate 4 to the outer periphery of the back plate 5 without gaps. A rectangular parallelepiped space surrounded by the back plate 5, the upper side plate 2, the lateral side plate 3 and the lower side plate 4 is formed inside the outlet box body 1a, and electric cables are introduced into this space from the outside. Can do.
The side plate composed of the upper side plate 2, the lateral side plate 3 and the lower side plate 4 and the back plate 5 may be joined at a right angle or may be joined so as to include a curved surface.

Further, a flange plate 6 is detachably combined with a screw 7 on each end surface 11 side of the upper side plate 2, the lateral side plate 3 and the lower side plate 4, that is, on the opening 10 side.
The outlet box 1 used in the present invention can be obtained, for example, by detachably combining the outlet box body 1a and the saddle plate 6.

  The said board 6 is provided with respect to the said outlet box main body 1a so that a switchboard etc. (not shown) can be installed easily, The inside of the said board 6 is illustrated in FIG. Thus, a substantially rectangular opening 14 is provided.

The said board 6 has a magnitude | size which can cover the through-hole normally provided in the wall.
As a result, the outlet box is formed so as to cover the through hole with the end surface side of the side plate composed of the upper side plate 2, the lateral side plate 3 and the lower side plate 4, that is, the opening 10 of the outlet box body 1a facing the wall side. Can be installed.

  As shown in FIG. 8, after the saddle plate 6 is detachably combined with the outlet box main body 1a, the opening 10 of the outlet box main body 1a shown in FIG. The part 14 is the same. Therefore, the opening of the outlet box 1 is shown in FIG.

  Further, an insertion hole 8 is formed in the upper side plate 2. The unused insertion hole is closed and sealed with a non-combustible material 9. In FIG. 5, the non-combustible material 9 is disposed inside the upper side plate 2, and the through hole is closed and sealed. The same material as the outlet box 1 can be used as the material of the non-combustible material 9.

As shown in FIG. 8, the side plate is screwed into the screw hole 12 including the notch provided in the flange plate 6 and the screw hole 13 provided in the end surface 11 of the side plate. The end plate 6 can be installed on the end surface 11 of the plate. As a result, the outlet box 1 used in the present invention shown in FIG. 8 is obtained.
In addition, a screw hole for fixing a switchboard or the like can be provided in the cover plate 6 as appropriate.

The material of the outlet box 1 used in the present invention is not particularly limited as long as it has fireproof properties. For example, inorganic materials, metals, and the like are used.
As an inorganic thing, things made from ceramics, ceramics, etc. are mentioned, for example.
Moreover, as a metal thing, the thing of 1 type or 2 types or more of things, such as aluminum, copper, steel, stainless steel, tin, lead, etc. are mentioned, for example.
If the outlet box 1 used for this invention will give an example, the metal box for metal conduits and a box cover etc. which are prescribed | regulated to JISC8340 will be mentioned, for example. Specifically, those made of soft steel are preferable, and those made of hot-rolled soft iron steel plates are more preferable. More preferably, the hot-rolled mild steel sheet is one specified in JIS G3131.

Next, the wall used in the present invention will be described.
Examples of the wall used in the present invention include a building wall, a partition wall, a floor, a ceiling, and the like, a steel plate provided in a waterproof compartment of a ship and a cabin.

Examples of the material used for the wall include concrete, incombustible board, steel plate and the like.
Examples of the non-combustible board include inorganic fiber boards formed from inorganic fibers, heat-resistant panels, and the like.

  As the inorganic fiber board, for example, a glass wool, rock wool, ceramic wool, gypsum fiber, carbon fiber, stainless steel fiber, slag fiber, silica alumina fiber, alumina fiber, silica fiber, zirconia fiber and other inorganic fibers as a sintering agent, Examples include boards obtained by molding using thermoplastic resins, adhesives, and the like.

Examples of the heat resistant panel include a cement panel and an inorganic ceramic panel.
Examples of the cement-based panel include hard wood piece cement boards, inorganic fiber-containing slate boards, lightweight cellular concrete boards, mortar boards, and precast concrete boards.
Examples of the inorganic ceramic panel include a gypsum board, a calcium silicate board, a calcium carbonate board, a mineral wool board, and a ceramic board.

  Here, as the gypsum board, specifically, a lightweight material such as saw dust or pearlite is mixed into calcined gypsum, and cardboard is pasted on both sides and molded. ), Decorative gypsum board (JIS A6911 compliant: GB-D), waterproof gypsum board (JIS A6912 compliant: GB-S), reinforced gypsum board (JIS A6913 compliant: GB-F), sound-absorbing gypsum board (JIS A6301 compliant: GB) -P) and the like.

  The material used for the said wall can use 1 type, or 2 or more types.

Moreover, there is no limitation in the wall used for this invention, What is normally used for a wall can be selected suitably, and can be used. As a specific shape of the wall, for example, a faithful wall having no space inside, a hollow wall having a space inside, or the like can be used.
Examples of the hollow wall include a structure in which the heat-resistant panel or the like is fixed to a frame material such as a metal frame or a steel frame.
When a hollow wall is used as the wall, inorganic fibers or the like can be installed inside the hollow wall.
Examples of the inorganic fiber include glass wool, rock wool, ceramic wool, gypsum fiber, carbon fiber, stainless steel fiber, slag fiber, silica alumina fiber, alumina fiber, silica fiber, and zirconia fiber.

Next, the fire prevention structure of an outlet box using the through-hole insertion cylinder and the through-hole insertion cylinder will be described in detail with reference to the drawings.
In addition, this invention is not limited at all by these Examples.

FIG. 9 is a schematic perspective view illustrating the through-hole inserting cylinder body used in the first embodiment.
The through-hole insertion tube 400 shown in FIG. 1 described above was cut along the groove portion 402 of the through-hole insertion tube 400 to obtain a through-hole insertion tube body 101 made of a cylindrical synthetic resin layer.
The length of the through-hole inserting cylinder main body 101 in the axial direction (dotted line AA in FIG. 1) is 80 mm, the vertical width based on the vertical plane with respect to the axial direction is 96 mm, and the horizontal width is 58 mm.
The through-hole insertion cylinder body 101 is formed by molding the resin composition described above, and polypropylene is used as the organic material.

FIG. 10 is a schematic perspective view illustrating the through hole insertion cylinder 100.
A thermally expandable fireproof sheet 102 is affixed to the through hole insertion tube body 101 as a tubular thermally expandable fireproof resin layer. This heat-expandable fireproof sheet 102 has a total thickness of 10 mm, and is formed by laminating a heat-expandable resin composition layer and an aluminum foil laminated glass cloth.

  In the case of Example 1, it has the structure provided with the cylindrical heat-expandable fireproof resin layer on one end face of the cylindrical synthetic resin layer. It can also be installed inside the tube 100. This also applies to the following embodiments.

As the thermally expandable fireproof sheet 102, a commercially available product can be appropriately selected and used.
As such a commercial product, for example, Fibro (manufactured by Sekisui Chemical Co., Ltd. (registered trademark. Sheet material containing a resin composition containing epoxy resin, rubber, and thermally expandable graphite)), manufactured by Sumitomo 3M Co., Ltd. Fire barrier (sheet material composed of a resin composition containing chloroprene rubber and verculite, expansion coefficient: 3 times, thermal conductivity: 0.20 kcal / m · h · ° C.), medhicut (manufactured by Mitsui Kinzoku Paint Chemical Co., Ltd.) Sheet material comprising a resin composition containing a polyurethane resin and thermally expandable graphite, expansion coefficient: 4 times, thermal conductivity: 0.21 kcal / m · h · ° C.) and the like.

In the case of Example 1, since the adhesive component is added to the thermally expandable resin composition layer of the thermally expandable fireproof sheet 102, it can be attached to the through-hole inserting cylinder body 101.
In addition, when the adhesive component is not added to the thermally expandable resin composition layer, the thermally expandable fireproof sheet 102 is attached to the through-hole inserting cylinder main body using a fixing means such as an adhesive or a double-sided adhesive tape. 101 can also be attached. This also applies to the following embodiments.

  The through hole insertion tube 100 according to the first embodiment is obtained by cutting the through hole insertion tube 400 along the groove portion 402 of the through hole insertion tube 400. Therefore, by changing the cutting position of the through-hole insertion tube 400, the through-hole insertion cylinder 100 having a desired axial length can be obtained.

The through hole insertion cylinder 110 according to the second embodiment is a modification of the through hole insertion cylinder 100 according to the first embodiment.
FIG. 11 is a schematic perspective view illustrating the through-hole insertion cylinder 110 according to the second embodiment.
In the through-hole inserting cylinder 100 according to the first embodiment, the thermally expandable fireproof sheet 102 is pasted on one end face of the through-hole inserting cylinder main body 101.
On the other hand, the through-hole insertion cylinder 110 according to the second embodiment is different in that thermally expandable fireproof sheets 102 and 102 are attached to both end faces of the through-hole insertion cylinder main body 101.
Other than that is the same as the through-hole insertion cylinder 110 according to the first embodiment.
As shown in the second embodiment, thermally expandable fireproof sheets 102 and 102 can be installed on both end faces of the through-hole inserting cylinder body 101.

The through hole insertion cylinder 120 according to the third embodiment is a modification of the through hole insertion cylinder 110 according to the second embodiment.
FIG. 12 is a schematic perspective view illustrating the through-hole insertion cylinder 120 according to the third embodiment.
In the through-hole inserting cylinder 110 according to the second embodiment, the heat-expandable fireproof sheets 102 and 102 are pasted on both end faces of the through-hole inserting cylinder main body 101.
On the other hand, the through hole insertion cylinder 120 according to the third embodiment is different in that the thermally expandable fireproof sheet 103 is sandwiched between the two through hole insertion cylinder main bodies 101.
The thermally expandable fireproof sheet 103 is composed of a thermally expandable resin composition layer. In addition, since an adhesive component is added to the heat-expandable resin composition layer of the heat-expandable fireproof sheet 103, the heat-expandable fireproof sheet 103 is attached to the end surfaces of the two through-hole insertion cylinder main bodies 101. be able to.

The through hole insertion cylinder 130 according to the fourth embodiment is a modification of the through hole insertion cylinder 100 according to the first embodiment.
FIG. 13 is a schematic perspective view illustrating the through-hole insertion cylinder 130 according to the fourth embodiment.
In the through-hole inserting cylinder 100 according to the first example, the heat-expandable fireproof sheet 102 was attached to one end face of the through-hole inserting cylinder main body 101 made of the resin composition.
On the other hand, the through-hole insertion cylinder 130 according to Example 4 is different in that it is obtained by cutting a through-hole insertion tube made of a thermally expandable resin composition. The shape and size of the through-hole insertion cylinder 130 are the same as those of the through-hole insertion cylinder 100 according to the first embodiment except that the formed raw materials are different.
As shown in the through-hole insertion cylinder 130, the through-hole insertion cylinder 130 may be entirely made of a thermally expandable resin composition.

The through hole insertion cylinder 140 according to the fifth embodiment is a modification of the through hole insertion cylinder 130 according to the fourth embodiment.
FIG. 14 is a schematic perspective view illustrating a through-hole insertion tube 140 according to the fifth embodiment.
The through-hole insertion tube 130 according to Example 4 was obtained by cutting a through-hole insertion tube made of a thermally expandable resin composition.
On the other hand, in the through hole insertion cylinder 140 according to Example 5, the through hole insertion cylinder 130 obtained in Example 4 is used as the thermally expandable resin composition layer 104, and the through hole described in Example 1 is used. It is installed in the insertion tube main body 101.
The thermally expandable resin composition layer 104 can be fixed to the through-hole inserting cylinder main body 101 using fixing means such as an adhesive or a double-sided adhesive tape.

  As a modification, the thermal expansibility can be set at an arbitrary position in the axial direction of the through-hole insertion tube 140 by alternately installing a plurality of the through-hole insertion tube main bodies 101 and the thermally expandable resin composition layers 104. The resin composition layer 104 can be installed.

Example 6 shows the fire prevention structure of the outlet box using the through-hole insertion cylinder 100 shown in Example 1, and illustrates one application example of the through-hole insertion cylinder 100 shown in Example 1. It is a thing.
FIG. 15 is a schematic cross-sectional view of an essential part for explaining an outlet box fire prevention structure 500 according to a sixth embodiment.
As shown in FIG. 15, the outlet box 1 attached to a stud (not shown) with a metal fitting or the like is installed inside the wall 40.
The outlet box is made of metal, and the wall 40 is formed by stacking two reinforced gypsum boards 41a having a thickness of 21 mm.
The structure of the outlet box 1 used in Example 6 is the same as that used in FIGS.
The outlet box 1 shown in FIG. 15 can be installed on a wall (not shown) by fixing it to a stud using a metal fitting or the like. Metal fittings, studs, and the like for installing the outlet box 1 on the wall are commercially available, and commercially available metal fittings, studs, and the like can be appropriately selected and used.
When the outlet box 1 is installed on the wall 40 using a stud, it is preferably installed close to the wall 40.

Further, as shown in FIG. 15, electric cables 50 are inserted into the outlet box 1 through insertion holes 8 (see FIGS. 6 and 7) formed in the outlet box 1.
Examples of the electric cables 50 used in the present invention include power line cables, antenna line cables, and optical fiber cables. Electric wires and cables can be single core or two or more cores.

The power line cable, the antenna line cable, and the like are preferably made by coating a metal wiring such as copper with an insulator such as polyethylene resin, vinyl chloride resin, or glass fiber.
As the optical fiber cable, an optical fiber made of synthetic resin, glass, or the like can be used.

The electric cable 50 used in Example 6 is one in which the power line cable 51 is inserted through the flexible electric conduit 52.
The flexible electric conduit 52 is made of a synthetic resin and can be freely bent, and a commercially available product can be appropriately selected and used. The flexible conduit 52 is preferably one that conforms to JIS C8411.

A cylindrical fixture 60 is fixed to the end of the flexible conduit 52 on the outlet box 1 side. On the other hand, a cylindrical fixed receiver 61 is closely attached to the insertion hole 8 of the outlet box 1 without a gap. By fitting and fixing the cylindrical fixture 60 and the cylindrical fixture 61, the end of the flexible conduit 52 can be installed in close contact with the outlet box 1.
As the tubular fixture 60 and the tubular fixture 61, those commercially available as pipe connectors can be appropriately selected and used.

  Further, as shown in FIG. 15, the opening 14 of the outlet box 1 and the through hole 43 of the wall 40 are part or all of the through hole 43 of the wall 40 with respect to the vertical direction of the wall 40. And a part or all of the opening 14 of the outlet box 1 is adjusted so as to overlap each other.

  In the case of the sixth embodiment, the outlet box 1 attached to the stud with a metal fitting or the like is installed inside the wall 40. A through hole 43 is provided in the wall 40 corresponding to the position of the outlet box 1.

  The outlet box 1 is connected to a through-hole insertion cylinder 100 according to the first embodiment. Specifically, the connecting member 62 is used to connect to the plate 6 of the outlet box 1. The connecting member 62 passes through the connecting member receiving portion 404 (see FIG. 1) of the through-hole inserting tube 100.

  The through-hole insertion cylinder 100 used in Example 6 expands to sufficiently close the inside of the through-hole 43 formed in the wall 40 when the outlet box 1 is heated by a flame such as a fire. The expansion ratio, thickness, and the like of the thermally expandable resin composition layer can be determined so that a residue is generated.

As shown in FIG. 15, the end of the power line cable 51 is connected to the switchboard 70.
The switchboard 70 includes a wired communication outlet for connecting an Internet line, a telephone line, etc., a power outlet for supplying power such as 100 V and 200 V, a power switch for controlling the supply of power, a constant Power breaker for cutting off current when using the above power, Energizing indicator lamp for displaying whether or not power is being supplied, Information display for displaying current time, operating status of control equipment, etc. Equipment etc. can be installed.
After the end of the power line cable 51 is connected to the switchboard 70, the switchboard 70 is installed on the support frame 71.

The support frame 71 is installed outside the through hole 43 of the wall 40 on the side opposite to the side on which the outlet box 1 is installed.
The connecting member 62 is inserted into the through hole 43 of the wall 40, and the flange plate 6 and the support frame 71 of the outlet box 1 are detachably fixed by screws.
Since the connecting member 62 passes through the connecting member receiving portions 404 and 404 of the through-hole inserting tube 100, the outlet box 1 is connected to one end of the through-hole inserting tube 100 by the connecting member 62. The said board 6 can be connected. In addition, the support frame 71 can be connected to the other end of the through-hole insertion tube 100.
The support frame member 71 and the connecting member 62 are made of metal, and as in the case of the outlet box 1, even when the outlet box fire prevention structure 500 according to the sixth embodiment is exposed to heat such as a fire, the shape is constant. Can be maintained.

The decorative board 72 is installed so that the switchboard 70 and the support frame 71 cover the wall 40 from the outside. The decorative plate 72 is fixed to the support frame 71 by fixing means such as screws.
The decorative plate 72 is provided with an opening, and from the outside of the wall 40, through the opening of the decorative plate 72, a wired communication outlet, a power outlet, a power switch, a power breaker, etc. of the switchboard are provided. It can be operated and the power indicator lamp, the information display device, etc. of the switchboard can be visually recognized.

When the outlet box fire prevention structure 500 according to the sixth embodiment is exposed to heat such as a fire, the expansion residue generated by the thermally expandable resin composition layer included in the through-hole insertion tube 100 becomes a through-hole in the wall 40. The inside of 43 is closed.
This expansion residue can prevent flames such as fire, smoke and the like from diffusing through the through holes 43 of the wall 40.

  By connecting the outlet box 1 and the through-hole insertion tube 100, the support frame 71 is connected to the through-hole by the connecting member 62 from the side opposite to the wall 40 where the outlet box 1 is installed. The insertion tube 100 can be easily connected.

Further, the powdery contents of the wall 40 may be scraped and exposed on the inner surface of the through hole 43 provided in the wall 40.
In the case of the fire prevention structure 500 of the outlet box 7 according to the sixth embodiment, the power line cable 51 is inserted through the through-hole insertion tube 100.
For this reason, it can prevent that the inside of the said outlet box 1, the said cable 51 for power lines, the switchboard 70, etc. are contaminated with the powdery content inside the through-hole 43 of the wall 40. FIG.

  Moreover, the said through-hole penetration cylinder is obtained by cut | disconnecting the through-hole penetration pipe | tube provided with the groove part in the outer periphery along the said groove part. For this reason, even when the length of the through hole in the wall changes depending on the position of the wall, the through hole insertion tube corresponding to the length of the through hole can be obtained at the construction site, so that the workability is excellent.

In the case of the outlet box fire prevention structure 500 according to the sixth embodiment, the case where the through-hole insertion cylinder 100 obtained in the first embodiment is used as the through-hole insertion cylinder has been described.
By using the through-hole insertion cylinders 110 to 140 shown in Examples 2 to 5 instead of the through-hole insertion cylinder 100, the fire prevention structure for the outlet box is obtained in the same manner as in Example 6. Can do.

DESCRIPTION OF SYMBOLS 1 Outlet box 1a Outlet box main body 2 Upper side plate 3 Lateral side plate 4 Lower side plate 5 Back plate 6 Girder plate 7 Screw 8 Insertion hole 9 Nonflammable material 10 Opening part 11 of outlet box main body End surface 12, 13, 16 Screw hole 14 Outlet Box opening 15 Cross section shape of outlet box 30 Fire spread prevention part 40 Wall 41a Reinforced gypsum board 43 Through hole 44 Gap 50 Electric cable 51 Cable for power line 52 Flexible electric wire tube 60 Cylindrical fixture 61 Cylindrical fixed receptacle 62 Connecting member 70 Distribution board 71 Support frame body 72 Decoration plate 73 Holding frame 74 Wiring terminals 100, 110, 120, 130, 140 Through-hole insertion cylinder 101 Through-hole insertion cylinder main body 400, 400a, 400b Through-hole insertion pipe 402 Groove 403 Outer surface 404 Connecting member receiving section 500 Fire prevention measures for outlet box Dashed line A-A axis granulation

Claims (6)

A through-hole insertion cylinder for use in an outlet box,
A through hole through tube equipped with a groove on the outer circumference, resulting et been cut along the groove,
Two or more groove portions of the through-hole insertion tube are installed at intervals along the outer periphery of the through-hole insertion tube,
A through-hole insertion cylinder provided with a thermally expandable fireproof resin layer . The through-hole insertion cylinder according to claim 1 , wherein the through-hole insertion cylinder provided with the thermally expandable refractory resin layer is at least one of the following (1) to (3).
(1) A through-hole insertion cylinder provided with a cylindrical thermal expansion refractory resin layer on at least one end face of the cylindrical synthetic resin layer. (2) A cylindrical synthetic resin layer is provided at both ends of the cylindrical thermal expansion refractory resin layer. Through-hole insertion cylinder (3) Through-hole insertion cylinder made of a cylindrical thermally expandable refractory resin layer A fire prevention structure for an outlet box using the through-hole insertion tube according to claim 1 or 2 ,
The outlet box is installed so as to cover the through hole with respect to the wall having the through hole,
The outlet box has a space surrounded by a back plate and a side plate joined to the outer periphery of the back plate, and is installed on the wall with the opening side of the outlet box facing the wall,
Wire cables are inserted through an insertion hole formed in at least one of the back plate and the side plate of the outlet box,
The through hole insertion cylinder is installed inside the through hole of the wall,
The outlet box fire prevention structure, wherein the outlet box and the through-hole insertion cylinder are connected to each other. The outlet box is a detachable combination of an outlet box main body and a plate having an opening,
A gutter having the opening is installed on the opening side of the outlet box body,
The support frame is installed outside the through hole of the wall opposite to the side where the outlet box is installed,
The through hole insertion cylinder is installed inside the through hole of the wall,
One end surface of the through-hole insertion tube is connected to a plate having the opening,
The fireproof structure for an outlet box according to claim 3 , wherein the other end surface of the through-hole insertion tube is connected to the support frame. The fireproof structure for an outlet box according to claim 3 or 4 , wherein a heat-expandable fireproof sheet is installed inside the through-hole insertion tube. The wire cables are inserted through the inside of a flexible conduit tube with a cylindrical fixture at the end,
A cylindrical fixed receiver is installed in the insertion hole of the outlet box,
The support frame is installed outside the through hole of the wall opposite to the side where the outlet box is installed,
A cylindrical fixture installed at the end of the flexible conduit is fitted to a cylindrical fixture installed in the insertion hole of the outlet box,
A switchboard is installed on the support frame,
The wire cables inserted through the inside of the flexible conduit are introduced into the outlet box and connected to the switchboard,
The switchboard includes at least one selected from the group consisting of a wired communication outlet, a power outlet, a power switch, a power breaker, a power indicator, and an information display device,
The switchboard and the support frame are covered from the outside of the wall by a decorative plate, and a power outlet, a power switch, and a power breaker of the switchboard can be operated through the opening of the decorative plate, The fire prevention structure for an outlet box according to any one of claims 3 to 5 , wherein the indicator lamp and the information display device can be visually recognized .

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