JPH11222955A - Fire preventive provision construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide fire preventive provision construction allowing fire preventive measures to be taken easily in a short time again at an opening part of fire preventive provision construction after dismantlement at the time of re-laying work or extension work of a long-sized body such as a cable and allowing fire preventive provision of high fire preventive resistance to be taken with simple structure and work execution also at a place where a large quantity of cables is piercingly wired. SOLUTION: Fire preventive provision construction is provided with a fire resistant frame body 14 provided on a floor 11 so as to surround cables 15; a fire resistant shielding body 13 shielding an opening part 12; a cutout part 16a formed in the shielding body 13 so as to insert the cables 15 through, with a clearance S of specified dimension to the outer peripheral surface of the cables 15; a plurality of fire resistant elastic fillers 18 filled in the frame body 14 and closed; and a thermally expansive fire-resistant sheet interposed between the fire resistant fillers 18 and the shielding body 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire prevention structure at a penetration portion, for example, formed on a floor or a wall of a building and through which a communication cable and the like pass.

[0002]

2. Description of the Related Art In a building such as a factory or a building, a through hole is formed in a fire protection section such as a floor or a wall, and a long body such as a cable or a resin pipe is penetrated through the through hole. In this case, from the viewpoint of preventing the spread of fire in a fire, it is mandatory to take fire-prevention measures with a fire protection performance of 2 hours according to the Building Standards Law by backfilling the gap between the through hole and the long body with fire-resistant material. Have been.

[0003] There are various types of fire prevention measures for such fire prevention compartments. The main one is shown in FIG. In the construction method using the structure shown in FIG. 33, for example, a rock wool 4 is packed around a communication cable 3 as a long body penetrating through the opening 2 of the floor fire protection compartment 1, and the upper surface of the floor fire protection compartment 1 On the lower surface, lids 5 and 5 made of a refractory plate such as calcium silicate are arranged. Then, the upper and lower lids 5, 5 are anchor bolts 6,
At 6, it is fixed to the floor fire protection compartment 1, and the refractory putties 7, 7 are packed and fixed in the gap between the cable 3 and the lids 5, 5.

[0004]

However, in the conventional fire-prevention measure structure, when the communication cable 3 penetrating through the floor fire-prevention section 1 is replaced or expanded, the rock wool 4 and the lid are not used. 5,5, refractory putty 7,
It was necessary to remove all the fire prevention measures such as 7 and the like, which was troublesome.

[0005] In addition, the replacement work usually takes several days to several weeks, during which time the fire prevention member is removed and left open. Therefore, if a fire occurs in this state, there is a risk that fire and smoke may blow out from the opening 2 of the floor fire protection compartment 1 and spread.

Further, when a large number of cables such as communication cables are wired in a bundle, or when a power cable having a thick conductor is wired through, the amount of heat supplied to the non-fire side via the conductor. Therefore, ordinary fillers such as the rock wool 4 and the refractory putty 7 cannot suppress heat conduction, and there is a risk that the non-fire side becomes hot and the fire spreads.

[0007] The present invention has been made in view of the above circumstances,
When exchanging long cable or other long bodies or constructing additional facilities,
The fire opening can be easily fired again in a short time again at the opening after dismantling of the fire prevention structure, and high fire resistance can be achieved with a simple structure and construction even in areas where a large amount of cables pass through. It is an object of the present invention to provide a fire-prevention measure structure capable of having a fire-prevention measure.

[0008]

In order to solve the above-mentioned problems, the present invention is directed to a fire protection compartment having an opening through which a long body passes, and the fire protection compartment on the fire protection compartment. A fire-resistant frame provided to surround the scale,
A fire-resistant shield that shields the opening, a cutout formed in the shield, and a cutout that allows the elongated body to pass therethrough with a predetermined gap between the shield and the outer peripheral surface; and the frame. It comprises a plurality of refractory fillers filled in the body and having an elasticity for hermetically sealing, and a thermal expansion material interposed between the refractory fillers and the shield.

According to a second aspect of the present invention, there is provided a fireproof compartment having an opening through which the elongated body passes, and a fireproof frame provided on the fireproof compartment so as to surround the elongated body. A body, a fire-resistant shield that shields the inner bottom of the opening, and a cutout formed in the shield, and the long body is inserted with a gap of a predetermined dimension between the elongated body and an outer peripheral surface thereof. A cutout portion, a plurality of refractory fillers filled in the openings and having elasticity for sealing, and a thermal expansion material interposed between the refractory fillers and the shield.

According to a third aspect of the present invention, there is provided a fireproof compartment having an opening through which the elongated body penetrates, and a fireproof frame provided on the fireproof compartment so as to surround the elongated body. Body, a fire-resistant shield that shields the opening, and a notch formed in the shield to cut through the elongated body with a gap of a predetermined dimension between its outer peripheral surface and the notch. A plurality of refractory fillers filled in the frame and having an elasticity for sealing, and a thermal expansion material interposed between the refractory filler and the shield, wherein the refractory filler is provided. Is a thermal expansion material that expands when heated, a deformable flexible material,
And a composite comprising at least two or more of heat absorbing materials that absorb ambient heat, wherein the composite is wrapped in an integrated state by a flame-retardant or non-flammable sheet material. And

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in FIGS. FIG. 1 is a sectional view showing a fire protection structure according to the present invention, and FIG. 2 is a plan view showing a part of the structure.

In the figure, reference numeral 11 denotes a floor as a fire protection compartment, and an opening 12 is formed in the floor 11. This opening 1
2, a long-length body is pierced by a FRPE cable 15a, an optical fiber cable 15b, a cable 15c in a PVC station, and a cable rack 15d (hereinafter, referred to as a cable 15). A frame 14 is provided on the floor 11 so as to surround the opening 12, and the frame 14 is
a and anchor bolt 17b.

A lower shielding plate 13 is arranged at the inner bottom of the frame 14 so as to close the opening 12, and an upper shielding plate 20 is arranged at the upper end of the frame 14. The upper shielding plate 20 is fixed to the frame body 14 by fixing brackets 17c. The frame 14 and the shielding plates 13 and 20 are formed of a calcium silicate plate or the like having excellent fire resistance, and the shielding plates 13 and 20 are formed with cutout portions 16a and 16b through which the cable 15 is inserted. These notches 1
6a and 16b are notched so as to have a gap S of at least 50 mm or more from the outer periphery of the cable 15 in consideration of a future wiring space.

The refractory fillers 18 are inserted into the frame 14 in a slightly pressed state.
8 and a lower shielding plate 13, a thermal expansion material sheet 19 a such as a Danseal D is interposed. There are variations of large, medium and small size refractory sponges A, B and C in the refractory filler 18. . Refractory sponge A, B, C
Are closely contacted inside the frame body 14 by a repulsive force of each other.

A heat-resistant sealing material 19b is interposed between the upper surface of the floor 11 and the lower surfaces of the frame 14 and the lower shielding plate 13. 3 to 8 show the replacement of the cable 15 and the like,
This shows the procedure for extension work.

In this case, first, as shown in FIGS. 3 and 4, the upper shield plate 20 is removed, and then the refractory fillers 18 to be replaced and added are pulled out.
Next, as shown in FIGS. 5 and 6, the cable 15 is exchanged (or added), and then, as shown in FIGS. Fill and seal.

As described above, after the replacement of the cable 15 and the extension work are completed, the refractory fillers 18.
(Large, medium, and small refractory sponges A, B, and C) are combined to complete the restoration work just by closing the remaining gap.

Moreover, the lower shielding plate 13 and the cable 15
Since a gap S of about 50 mm is provided in advance between them and the like, there is no need to take out the lower shielding plate 13 and newly cut it out if the extension is within the range of this size.

Therefore, it is possible to release / recover the fire-prevention measure portion extremely easily and within a short time.
FIG. 9 is a perspective view showing the refractory filler 18.

The refractory filler 18 is a composite comprising a combination of a thermal expansion material 21 which expands when heated, a deformable flexible block material 22, and a heat absorbing material 23 which absorbs surrounding heat. Flame retardant or non-flammable sheet 24
And wrapped in an integrated state.

The thermal expansion material 21 is a material that expands in volume by receiving heat when heated, and is, for example, "Dance-L-D".
(Product name: Furukawa Electric Co., Ltd.) may be used. This Dansyl D is a rubber sheet-like composition that has not expanded before heating, and has a relatively large heat capacity and a high density.

Therefore, during heating, the volume expands while generating a pressing force, and after expansion, it changes into a carbonized product having a high heat insulating property, so that the heat insulating effect is high. Other than the above, examples of the thermal expansion material 21 include “Heat Melpate” (trade name: manufactured by Furukawa Electric Co., Ltd.), “Fomox” (trade name, manufactured by Bayer AG, West Germany), and “Fire Barrier” (trade name: 3M USA) Manufactured) can be used.

The flexible block material 22 can satisfy the required function by any of sponge-like block bodies represented by foamable polyethylene, foamed rubber, etc. In order to maintain flexibility and elasticity, a material that is unlikely to cause elastic creep is optimal.

The heat absorbing material 23 is for absorbing and preventing the heat on the fire side from being supplied to the non-fire side via a conductor such as a cable, and is directly connected to a heat conductor such as a cable. In the case where it is not in the vicinity, there is an effect of preventing weight loss and falling off due to heat of the refractory filler 18 itself and surrounding members,
The effect of extending the fire resistance performance time of the fire prevention structure is exhibited.

The composition is a composition to which an endothermic component such as aluminum hydroxide is added. For example, it is a composition having flexibility such as flame-retardant foamed polyethylene or foamed rubber to which aluminum hydroxide is added. Is also good.

In order to more positively expect the effect of absorbing heat, a swollen water-absorbing polymer or the like is effective. For example, "Proteco Pack" (trade name: Furukawa Electric) enclosed in an aluminum pack Industrial Co., Ltd.).

The flame-retardant or non-flammable sheet 24 is made of glass fiber, carbon fiber fabric, or the like.
This is to prevent damage and the like.

The fire-resistant filler 18 of the present invention has the effect shown in FIG. 10 in a fire. Normally, when only the flexible block material represented by foamed polyethylene or the like is filled in the frame 14 as a fire-resistant filler, even if the flexible block material itself has flame retardancy, Even if it is included in the heat-resistant sheet 24 or the like and provided with fire resistance, the fire-resistant filler itself loses its weight over time when exposed to heating for 2 hours or more required for the fire resistance performance time of the section penetration part. It may shrink and eventually create a gap through which the flame passes.

[0029] Even if a considerable amount of fire resistance is provided to withstand heating for more than two hours, a large number of cables such as communication cables are bundled and penetrated, or a power cable with a thick conductor is penetrated. When wired, the amount of heat supplied to the anti-fire side via conductors is extremely large, so that heat conduction cannot be suppressed as in the case of ordinary fillers such as rock wool and fire-resistant putty. There is a danger of high temperature on the side and fire spread.

However, in the refractory filler 18 according to the present invention, even if the flexible block material 22 itself is reduced or contracted, the existing thermal expansion material 21 expands at the same time, and the refractory fillers 18. There is no gap between the cable and the like.

At the same time, the heat absorbing material 23 has the effect of absorbing the heat of the heat conductor such as a cable, and has the effect of preventing the refractory filler 18 itself and the surrounding members from being reduced or dropped due to the heat. It has the effect of dramatically extending the fire resistance performance time.

FIG. 11 is a perspective view showing a first embodiment of a refractory filler 30 according to the present invention. In this embodiment, a thermal expansion material 21 is sandwiched between a flexible block material 22 and a heat absorbing material 23. A complex is formed in a state sandwiched between the two.

The refractory filler 30 is designed so that the heat-absorbing material 23 side can be specified and arranged toward the cable 15 or the like which easily conducts heat. It is effective for

FIG. 12 is a perspective view showing a refractory filler 31 according to a second embodiment of the present invention. In this embodiment, when the fire side can be specified by a floor penetrating portion or the like, the thermal expansion material 21 is made flexible. It is arranged only on the lower half side, not on the entire surface of the conductive block material 22 and the heat absorbing material 23.

FIG. 13 is a perspective view showing a refractory filler 32 according to a third embodiment. In this embodiment, the thermal expansion material 21 and the heat absorbing material 23 are made of two or more flexible blocks. The composite is formed by being sandwiched between the members 22 in a sandwiched state, which is effective in securing more flexibility.

FIG. 14 is a perspective view showing a refractory filler 33 according to a fourth embodiment. In this embodiment, a thermal expansion material 21 and a heat absorbing material 23 are arranged in a vertical direction.
It is included in a state sandwiched by two or more flexible block materials 22 in a sandwich shape to form a composite.

FIG. 15 is a perspective view showing a refractory filler 34 according to a fifth embodiment of the present invention. In this embodiment, the thermal expansion material 21 is sandwiched by two or more flexible block materials 22. It is included in a state of being sandwiched between them to form a composite, and can be used relatively inexpensively in a small number of cables having a small heat conduction amount or a power cable having a thin conductor.

FIG. 16 is a perspective view showing a refractory filler 35 according to a sixth embodiment.
The composite is formed with the thermal expansion material 21 interposed only on the lower half side between the flexible blocks 22.

FIG. 17 is a perspective view showing a refractory filler 36 according to a seventh embodiment of the present invention. In this embodiment, the heat absorbing material 23 is formed into a deformable flexible block, and a flexible block is formed. This gives flexibility to the composite without using the material 22 in combination, and the thermal expansion material 21 is included in a state sandwiched by two or more flexible heat absorbing blocks 23 in a sandwich shape.

FIG. 18 is a perspective view showing a refractory filler 37 according to an eighth embodiment of the present invention. In this embodiment, the thermal expansion material 21 is provided not on the entire surface between the heat absorbing materials 23 but on the lower side. It is provided only on the half side.

FIG. 19 is a perspective view showing a refractory filler 38 according to a ninth embodiment. In this embodiment, two or more flexible block members 22 (or heat absorbing members 23) are provided. It is included in a state sandwiched by the thermal expansion material 21 to form a composite, and is effective when it is desired to further obtain the expansion effect of the thermal expansion material 21.

FIG. 20 is a perspective view showing a refractory filler 39 according to another embodiment of the present invention. In this embodiment, one side is a thermal expansion material 21 and the other is a flexible block material 22.
(Or heat absorbing material 23), which is a fire-resistant filler having a simple structure that can be used for a portion that is composed of only two members and does not require relatively severe fire resistance.

FIG. 21 is a perspective view showing a refractory filler 40 according to another embodiment of the present invention.
Is used when it is desired to obtain the expansion effect of the thermal expansion material 21 in a shorter time, and a heat conductor 41 made of a metal foil such as aluminum is previously arranged in a part of the composite.

FIG. 22 is a perspective view showing a refractory filler 42 according to another embodiment of the twelfth embodiment. In this embodiment, FIG.
The thermal expansion material 21 is not on the whole surface but only on the lower half side, and the heat conductor 41 made of metal foil such as aluminum is previously arranged in a part of the composite.

FIGS. 23 and 24 show a fire protection structure according to a second embodiment of the present invention. In this embodiment, the shielding plate 51 is fixed to the floor 11 with anchor bolts 52, and a frame 53 is provided on the shielding plate 51.

FIGS. 25 to 27 show a fire protection structure according to a third embodiment of the present invention. In this embodiment, three communication cables 62 are inserted in the opening 61 formed in the floor 11 at predetermined intervals in the longitudinal direction. Openings 6 on the lower and upper surfaces of floor 11
The upper and lower shields 63 and 64 that shield the light source 1 are attached. The upper and lower shields 63, 64 are respectively composed of a plurality of divided pieces 63a, 64a, and the plurality of divided pieces 63a, 64a are fixed by hanging bolts 65, respectively. The notch portions 63b, 6 for inserting the communication cables 62 into the upper and lower divided pieces 63a, 64a.
4b are formed respectively. The inside of the opening 61 is filled with large, medium, and small refractory sponges A, B, and C as the refractory filler 18, and the opening 61 is closed. Large, medium and small refractory sponges A, B, C and shield 64
A heat-expandable refractory sheet 67 is interposed between the two.

FIGS. 28 to 30 show a fire protection structure according to a fourth embodiment of the present invention. FIG. 28 is a plan view, FIG. 29 is a sectional view thereof, and FIG. 30 is a front view showing a cable. It is.

In this embodiment, the cable 15 is connected to the floor 1
After being arranged along one surface, it is inserted into the opening 73 on the side surface of the frame 72, then bent downward and inserted into the opening 12 on the floor 11. Opening 12 on floor 11
The inside is shielded by a shield 74, and a notch 75 through which the cable 71 is inserted is formed in the shield 74. A gap S of 50 mm is formed between the notch 75 and the cable 71. Inside the frame 72, the refractory filler 18
Large, medium and small refractory sponges A, B and C are filled and the opening 12 is sealed.

FIGS. 31 and 32 show a fire protection structure according to a fifth embodiment of the present invention. FIG. 31 is a plan view thereof, and FIG. 32 is a sectional view thereof. In this embodiment, a shielding plate 82 is provided in the opening 12 of the floor 11, and large, medium, and small refractory sponges A and B, which are the refractory filler 18, are provided in the opening 12 and the frame 83. , C are inserted and filled and hermetically sealed.

[0050]

As described above, according to the fire-prevention measure structure of the present invention, when replacing or adding a long body, the construction can be performed only by pulling out the refractory filler in the relevant portion. Thus, it is not necessary to remove all fire prevention members such as rock wool and refractory putty as in the related art, thereby reducing construction costs and costs due to loss and disposal of materials.

Further, after completion of the replacement and extension work of the long body, the restoration work can be completed only by inserting the refractory filler into the gap in the frame (or opening) and closing the gap. Since a gap of about 50 mm is provided in advance between the long body and the long body, it is not necessary to take out the shielding body and newly form a notch portion if the space is expanded within the range of this dimension.

Accordingly, it is possible to release and recover the fire prevention measures extremely easily and in a short time, and it is usually several days to
Even during the replacement work that takes several weeks, the opening of the fire protection compartment is not left in an open state and is safe.

Further, the refractory filler is made of a thermal expansion material, a flexible material,
Since it is composed of at least two composites of the heat absorbing material, the heat-expanding material can prevent loss and shrinkage of the refractory filler itself. Prevents weight loss and falling off of surrounding members due to heat. Therefore, the effect that the refractory performance time can be drastically extended as compared with the related art can be obtained.

Further, by combining these components, the performance of the refractory filler can be freely selected according to the characteristics of the elongated body intended for fire prevention. Therefore, it is possible to provide a fire prevention measure having a high fire prevention performance with a simple structure and construction according to the purpose.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a fire protection structure arranged at an opening of a floor fire protection compartment according to an embodiment of the present invention.

FIG. 2 is a plan view showing a fire-prevention measure structure partially broken away.

FIG. 3 is a perspective view showing a procedure of cable replacement / expansion work and showing a state in which a part of the refractory filler is partially removed.

FIG. 4 is a cross-sectional view showing a state in which a part of the refractory filler is similarly removed.

FIG. 5 is a perspective view showing a state in which cables are exchanged and expanded.

FIG. 6 is a cross-sectional view showing a state where cables are exchanged or added.

FIG. 7 is a sectional view showing a state in which a refractory filler is filled.

FIG. 8 is a perspective view showing a state in which the refilling of the cable and the replacement / extension of the cable are completed by filling with the refractory filler.

FIG. 9 is a perspective view showing a refractory filler.

FIG. 10 is a diagram showing a state change of a refractory filler during a fire.

FIG. 11 is a perspective view showing a first alternative embodiment of the refractory filler.

FIG. 12 is a perspective view showing a second other embodiment of the refractory filler.

FIG. 13 is a perspective view showing a third alternative embodiment of the refractory filler.

FIG. 14 is a perspective view showing a fourth other embodiment of the refractory filler.

FIG. 15 is a perspective view showing a fifth other embodiment of the refractory filler.

FIG. 16 is a perspective view showing a sixth other embodiment of the refractory filler.

FIG. 17 is a perspective view showing a seventh other embodiment of the refractory filler.

FIG. 18 is a perspective view showing an eighth embodiment of the refractory filler.

FIG. 19 is a perspective view showing a ninth other embodiment of the refractory filler.

FIG. 20 is a perspective view showing a tenth other embodiment of the refractory filler.

FIG. 21 is a perspective view showing an eleventh other embodiment of the refractory filler.

FIG. 22 is a perspective view showing a twelfth other embodiment of the refractory filler.

FIG. 23 is a plan view showing a fire protection structure according to a second embodiment of the present invention.

FIG. 24 is a cross-sectional view showing a fire protection structure.

FIG. 25 is a plan view showing a fire prevention structure according to a third embodiment of the present invention.

FIG. 26 is a side sectional view showing a fire prevention structure.

FIG. 27 is a front sectional view showing a fire protection structure.

FIG. 28 is a plan view showing a fire prevention measure structure according to a fourth other embodiment of the present invention.

FIG. 29 is a cross-sectional view showing a fire protection structure.

FIG. 30 is a front view showing a cable.

FIG. 31 is a plan view showing a fire prevention measure structure according to a fifth other embodiment of the present invention.

FIG. 32 is a cross-sectional view showing a fire protection structure.

FIG. 33 is a sectional view showing a conventional fire protection structure.

[Explanation of symbols]

 11 ... floor (fireproof compartment) 12, 61 ... opening 13, 64 ... shielding plate 14 ... frame 15 ... cable (long body) 18 ... refractory filler 19a, 67 ... thermal expansion material sheet (thermal expansion material) 21: Thermal expansion material 22: Flexible block material 23: Heat absorbing material

 ──────────────────────────────────────────────────続 き Continuation of the front page (71) Applicant 000165996 Furukawa Techno Material Co., Ltd. 5-1-1-8 Higashi-Hachiman, Hiratsuka-shi, Kanagawa (72) Inventor Shuhei Kano 3-4-1 Shibaura, Minato-ku, Tokyo・ TTI Facilities Co., Ltd. (72) Takamasa Takenouchi, Inventor 3-4-1 Shibaura, Minato-ku, Tokyo NTT Co., Ltd. (72) Inventor Joko Shimoura 3-chome Nishishinjuku, Shinjuku-ku, Tokyo 19-2 Nippon Telegraph and Telephone Corporation (72) Inventor Yasushi Fukasawa 19-2 Nishishinjuku 3-chome, Shinjuku-ku, Tokyo Japan (72) Inventor Shinpei Sano 3-chome, Nishishinjuku, Shinjuku-ku, Tokyo 19-2 Nippon Telegraph and Telephone Co., Ltd. Telegraph and Telephone Co., Ltd. (72) Inventor Shigeru Tejima 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Japan Telegraph and Telephone Co., Ltd. (72) Takashi Koitabashi 3-192, Nishi-Shinjuku, Shinjuku-ku, Tokyo Japan Telegraph and Telephone Co., Ltd. (72) Inventor Takami Sasaki 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. (72) Inventor Tadashi Naruse 5-1-1-8 Higashi-Hachiman, Hiratsuka-shi, Kanagawa Prefecture Stock (72) Inventor Masanori Owari 5-1-1-8 Higashi-Hachiman, Hiratsuka-shi, Kanagawa Inside Furukawa Techno Material Co., Ltd.

Claims (10)

[Claims] 1. A fire protection compartment having an opening through which an elongated body penetrates; a fire-resistant frame provided on the fire protection compartment so as to surround the elongated body; and shielding the opening. A notch formed in the shield, and a cutout formed in the shield to allow the elongated body to pass therethrough with a predetermined gap between the shield and the outer peripheral surface thereof; A fire protection structure, comprising: a plurality of refractory fillers having elasticity for sealing; and a thermal expansion material interposed between the refractory fillers and the shield. 2. A fire protection compartment having an opening through which the elongated body penetrates; a fire-resistant frame provided on the fire protection compartment so as to surround the elongated body; A shield having a fire resistance for shielding a bottom portion, a cutout formed in the shield, and a cutout portion through which the long body is inserted with a predetermined size gap between the shield and an outer peripheral surface thereof; A fire prevention structure comprising: a plurality of refractory fillers filled and hermetically sealed; and a thermal expansion material interposed between the refractory fillers and the shield. 3. A fire protection compartment having an opening through which the elongated body penetrates; a fire-resistant frame provided on the fire protection compartment so as to surround the elongated body; and shielding the opening. A notch formed in the shield, and a cutout formed in the shield to allow the elongated body to pass therethrough with a predetermined gap between the shield and the outer peripheral surface thereof; A plurality of refractory fillers having elasticity for sealing, and a thermal expansion material interposed between these refractory fillers and the shield, wherein the refractory filler expands when heated. Of expansion material, deformable flexible material, and heat absorbing material that absorbs surrounding heat,
A fire prevention structure, comprising a composite comprising at least two or more combinations, wherein the composite is wrapped in an integrated state by a flame-retardant or non-flammable sheet material. 4. The fire protection structure according to claim 3, wherein said composite body comprises said thermal expansion material sandwiched between a soft material and a heat absorbing material. 5. The fire prevention structure according to claim 3, wherein said composite body comprises said thermal expansion material and said heat absorbing material sandwiched between a plurality of flexible materials. 6. The fire protection structure according to claim 3, wherein the composite is formed by sandwiching a thermal expansion material between a plurality of flexible materials. 7. The fire protection structure according to claim 3, wherein the composite is formed by sandwiching a thermally expandable material with a deformable flexible block-shaped heat absorbing material. 8. The fire prevention structure according to claim 3, wherein the composite has a flexible material or a heat absorbing material sandwiched between a plurality of thermal expansion materials. 9. The fire protection structure according to claim 3, wherein the composite is formed by joining a flexible material or a heat absorbing material to a thermal expansion material. 10. The fire protection structure according to claim 3, wherein a heat conductor is provided on a bottom surface of the composite.