JPH0581582U - Fire protection structure for the penetration of the fire protection compartment of a plastic pipe - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a fire protection structure for the penetration part of a plastic pipe that has excellent fire spread prevention properties and is easy to work with. [Structure] A plastic pipe 1 is penetrated through a through hole 3 of a fireproof compartment 2, and a heat-foamable refractory material 4 is arranged below the through hole 3 and on the outer periphery of the plastic pipe 1. The heat-resistant foam 5 having a volume compressed by at least 20% from the normal pressure state was filled and arranged in between.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fire-prevention structure for a portion (penetration portion) where a plastic pipe is arranged in a through-hole of a fire-proof partition such as a fire wall or a fire floor of a building.

[0002]

[Prior Art]

 When a long object such as a plastic pipe or cable is placed through the through hole of a fireproof partition of a building, the gap between the through hole and the long object is filled with a refractory material such as mortar to prevent fire. Is obligatory to apply.

Conventionally, as this type of fire protection structure, there is one shown in FIG. This is because a plastic pipe C penetrates through a through hole B opened in a concrete fire prevention floor A, and a heat-foaming refractory material (for example, Furukawa Electric Co., Ltd. A company-made product name DANCER D) is wound, and a support E formed in a semicircular shape whose bottom is closed by metal is attached to the bottom of the fireproof floor A, and the bottom of the heat-foamable fireproof material D is attached. And supporting the outer peripheral surface.

In the fire protection structure of FIG. 6 (a), the bottom of the fire protection floor A becomes a fire and the temperature rises, and when the temperature rises above about 120 ° C., the plastic pipe C is softened and deformed. The material D foams and expands to close the gap created by the deformation of the plastic pipe C, and prevent smoke and flame from flowing out and spread the fire. Further, when the momentum of the fire becomes stronger, the foaming and expansion of the heat-foamable flameproof material D becomes remarkable and the plastic pipe C is crushed as shown in FIG. 6 (b), and the voids generated by burning and disappearing of the plastic pipe C are created. It completely closes and prevents the spread of fire. In this case, normally, the plastic pipe 3 can be almost completely closed by the heat-foaming refractory material D as shown in FIG. 6 (b) in about 20 to 25 minutes from the occurrence of the fire. Moreover, since this heat-foamable flame-resistant material D is finally transformed into an ash substance having a high heat insulating effect, it has many advantages such as preventing heat transfer to the adjacent chamber.

For safety, this type of fire protection structure requires a heating test for 2 hours in a fire experiment (JIS A-1304). However, in the fire protection structure of FIG. 6 (a), as shown in FIG. 6 (b), the portion F where the plastic pipe C is narrowed by the heat-foaming refractory material D is close to the fire side, and the blockage distance is short. In a heating test for a long time of 2 hours, clogging was often incomplete, and flames and smoke were circulated, sometimes failing to achieve the initial purpose.

Therefore, in order to more sufficiently block the penetration portion, conventionally, as shown in FIGS. 7A and 7B, the heat-foamable refractory material D is arranged in two stages in the axial direction of the plastic pipe C. There was also a fire measure structure.

Further, conventionally, as shown in FIG. 8A, a heat-foamable refractory material D is arranged under a fireproof floor A, and a fireproof material such as rock wool, which is inexpensive and has fire resistance, is provided in a through hole B above it. There was also a fire protection structure in which Material G was placed.

[0008]

[Problems to be solved by the device]

 However, in the fire protection structure of FIGS. 7 (a) and 7 (b), since the amount of the heat-foamable refractory material D used is large, the material cost becomes high and it becomes economically impractical.

In the fire protection structure of FIG. 8A, since the refractory material G cannot follow the deformation of the plastic pipe C at the time of fire, a gap H is formed as shown in FIG. 8B, and complete closure is difficult.

An object of the present invention is to provide a fire protection structure having excellent fire protection performance and easy to construct.

[0011]

[Means for Solving the Problems]

 As shown in FIG. 1, the fire protection structure for the penetration portion of the plastic pipe of the present invention is as shown in FIG. 1, in which the heat is applied to the outer periphery of the plastic pipe 1 below the through hole 3 of the fire protection component 2 through which the plastic pipe 1 is arranged. The foamable refractory material 4 is arranged, and the heat resistant foam 5 is filled between the through hole 3 and the plastic pipe 1 by compressing the volume thereof by at least 20% as compared with the normal pressure state.

[0012]

[Action]

 In the fire protection structure for the penetration portion of the plastic pipe of the present invention, since the heat-foaming refractory material 4 is arranged below the through hole 3 and outside the plastic pipe 1, the plastic pipe 3 is softened by the fire. At the same time, the heat-foamable refractory material 4 foams and expands, closing the gap created by the deformation of the plastic pipe 3 and preventing the spread of smoke and flame to the outside.

Further, since the heat-resistant foam 5 is filled between the through hole 3 and the plastic pipe 1 by compressing at least 20% of the volume of the heat-resistant foam 5 compared to the normal pressure state, the heat-resistant foam 5 is fired. When heated, the plastic pipe 1 is released from the compressed state and expanded inward (in the direction of the center), and the expansion tension causes the plastic pipe 1 to be compressed toward the center as shown in Fig. 1 (b) and compressed and deformed. , The gap created by burning and disappearing of the plastic pipe 1 is closed to prevent smoke and flame from spreading to the outside.

[0014]

【Example】

 FIG. 1 shows an embodiment of the fire protection structure of the penetration portion of the plastic pipe of the present invention. In FIG. 1, reference numeral 2 is a fire floor of a building (fireproof compartment), 3 is a through hole formed in the fire compartment 2, and 1 is a plastic pipe that is passed through the through hole 3. Further, in the present invention, a heat-foamable refractory material 4 is arranged below the through hole 3 and on the outer circumference of the plastic pipe 1, and a heat resistant foam 5 is placed between the through hole 3 and the plastic pipe 1 under a normal pressure state. Is packed at least 20% less than the volume.

As the heat-foamable refractory material 4, for example, DANSIL D (trade name: manufactured by Furukawa Electric Co., Ltd.) is used. Since this dancer D expands rapidly when heated, the plastic pipe 1 surely closes the gap that can be contracted, melted, burned, and finally disappeared by a fire. Moreover, since this heat-foamable refractory material 4 is a foam, it is soft and easily fits to the outer surface of the plastic pipe 1. In addition, when foaming, expanding, or burning, the surface is transformed into an ash substance with a high heat insulation effect, which is also an advantage that the heat insulation effect is very high. As the heat-foamable refractory material 4, other than the above, for example, Fomox (trade name: Bayer, Germany), FIRE STOP INTUMESCENTWRAP STRIP 2002 (trade name: Dow Corning, USA), and the like can be used.

In FIG. 1, the lower surface and the outer peripheral surface of the thermally foamable refractory material 4 are supported by a supporting tool 6. The supporting tool 5 is formed in a semi-cylindrical shape whose bottom is closed by metal, and a mounting flange 8 is formed in a ring shape on the upper peripheral edge of the semi-cylindrical portion 7, and the mounting flange 8 is attached to the bottom surface of the fire protection compartment 1. It is attached with anchor bolts 9.

The heat-resistant foam 5 is preferably provided with compression resistance, resilience, and flame retardancy (OI value of 30 or more). The material is not limited as long as this condition is satisfied. For example, a silicone rubber foam or a compressed heat-resistant fibrous material is suitable. In FIG. 1, as the heat-resistant foam 5, a silicone rubber foam having a specific gravity of 0.14 g / cc was used, and its volume was compressed toward the center of the plastic pipe 1 by at least 20% compared to the normal state. The space between the through hole 3 and the plastic pipe 1 is filled with almost no space.

There are various conceivable compression methods and construction methods for the heat-resistant foam 5, but for example, as shown in FIG. 2A, the heat-resistant foam 5 is formed into a block shape, and the outer periphery thereof is wrapped with a polyethylene film. As shown in FIG. 2B, the volume is compressed to about ½ of the volume in the normal state. As shown in FIGS. 3 and 4 (a), these are arranged vertically and arranged side by side on the entire circumference of the plastic pipe 1 in the through hole, and are filled between the plastic pipe 1 and the through hole 3.

As a material for wrapping the heat-resistant foam 5 in order to compress and deform it by at least 20% from the normal state, a heat-resistant foam at a temperature lower than that of the plastic pipe 1 (for example, a hard PVC pipe) is more preferable. A material that can release the compressive force quickly is required. Specific examples include polyethylene, polypropylene, paper, cloth and the like. In short, there is no particular limitation as long as the conditions for compression and release can be satisfied.

The safety of the fire protection structure of the embodiment of FIG. 1 was confirmed by a fire experiment (JIS A1304). The result is shown in FIG. In FIG. 1 (b), the portion of the plastic pipe 1 that has burned and disappeared is sufficiently filled with the thermally foamable refractory material 4. Further, the plastic pipe 1 which has been heated and softened by the expansion and restoration of the heat-resistant foam 5 which is packed by compressing the volume from the normal state is compressed toward the center of the pipe 1, and the pipe is It is deformed so as to narrow it down as shown in b). As a result, in combination with the foaming of the heat-foamable refractory material 4, the part where the plastic pipe 1 has disappeared and is softened is more reliably closed.

In the above-mentioned embodiment, the fireproof partition 2 is a fireproof floor. However, when the fireproof partition 2 is a firewall, as shown in FIG. By arranging the refractory material 4 and filling and arranging the heat-resistant foam 5 in the substantially central portion of the through hole 3 of the fireproof compartment 2, the fireproofing effect can be obtained against a fire that occurs on either side of the fireproof compartment 2. You can show the results.

[0023]

[Effect of the device]

 In the fire protection structure of the penetration portion of the plastic pipe of the present invention, since the heat-foamable refractory material 4 and the heat-resistant foam 5 are used together, the following effects can be obtained. ． The synergistic effect of the heat-foamable refractory material 4 and the heat-resistant foam 5 ensures fire spread prevention in the event of a fire. ． Since the heat-resistant foam 5 is present, the buffer effect of the plastic pipe 1 can also be exerted when no fire occurs (normal). ． Since the structure is not particularly complicated, construction is easy.

[Brief description of drawings]

1A is a longitudinal sectional view showing an example of a fire protection structure for a plastic pipe according to the present invention, and FIG. 1B is an explanatory view of the fire protection structure of FIG. 1A during a fire.

2A is a longitudinal sectional view showing an example of a heat-resistant foam used in the fire protection structure for a plastic pipe of the present invention, and FIG. 2B is a compression of the heat-resistant foam of FIG. 2A. FIG.

FIG. 3 is a perspective view showing an arrangement example of a heat resistant foam in a fire protection structure for a plastic pipe of the present invention.

4A is a cross-sectional view taken along line XX of FIG. 3, and FIG. 4B is a plan explanatory view when a fire occurs.

FIG. 5 is a vertical cross-sectional view of the fire protection structure for a plastic pipe according to the present invention applied to a fire wall.

6A is a vertical cross-sectional view of a conventional fire protection structure for a plastic pipe, and FIG. 6B is a vertical cross-sectional view of the fire protection structure of FIG. 6A during a fire.

7 (a) and 7 (b) are vertical cross-sectional views of a different example of a conventional fire protection structure for a plastic pipe.

8A is a vertical cross-sectional view of another conventional fire protection structure for a plastic pipe, and FIG. 8B is a vertical sectional side view of the fire protection structure of FIG. 8A during a fire.

[Explanation of symbols]

 1 plastic pipe 2 fireproof partition 3 through hole 4 heat-foamable fireproof material 5 heat-resistant foam

Claims (1)

[Scope of utility model registration request] 1. A heat-foamable refractory material 4 is arranged below the through hole 3 of a fireproof compartment 2 through which the plastic pipe 1 is arranged so as to penetrate, and the through hole 3 is formed.
Between the plastic pipe 1 and the plastic pipe 1, the heat-resistant foam 5 is compressed and packed at a volume of at least 20% compared to the normal pressure state, and arranged to be filled. .