JP2007282793A - Fireproof member and structure for penetration part of flammable long body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fireproof member for a penetration part of a flammable long body which uses a small amount of thermally expansive fire resistant material and is attached easily to the flammable long body. <P>SOLUTION: The fireproof member 1 comprises a thermally expansive fire resistant material 2 with a superior arc-shaped cross section. The fireproof member has a slit 3 that extends from one longitudinal end to the other end and has spring elasticity that makes the slit 3 to return to its original shape when the slit is released after being widened by an external force. When arranged in the outer periphery of a flammable long body 4, the central angle α of the thermally expansive fire resistant material 2 is between 210° and 330°. A fireproofness of the penetration part of the flammable long body is secured when the central angle α is ≥210°. When the central angle α is ≤330° (when the central angle of the slit is ≥30°), the fireproof member 1 is arranged easily on the flammable long body 4 by pressing the slit 3 onto the flammable long body and by widening the slit. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fire-resistant treatment member used in a portion where a flammable long body such as an electric wire / cable, a resin tube, or a resin coating penetrates a fire-proof compartment such as a wall or floor of a building, and the same. The present invention relates to a fire prevention structure.

  In a building such as a building or factory, if an opening is provided in a fire prevention compartment such as a wall or floor and a flammable long body such as an electric wire, cable or resin pipe is passed through it, In order to prevent the spread of fire, the penetration part must be subjected to a fire prevention treatment.

  Various types of fire-resistant treatment members for combustible long-body penetrations have been developed and put to practical use in recent years, but in recent years, as a fire-proof treatment member that is easy to construct, a thermally expandable fire-resistant material formed in a cylindrical shape A slit formed in the longitudinal direction is proposed (see Patent Document 1). This fireproofing member can be attached to a flammable long body by opening a slit, covering the flammable long body, and fixing it by some physical means.

JP 2001-280550 A

  Conventionally proposed fireproofing members have a structure in which the entire circumference of the combustible long body is covered with a thermally expandable refractory material, but as a result of repeated various experiments, the present inventors have not necessarily obtained a thermally expandable refractory material. The inventor obtained knowledge that the desired fire resistance can be obtained without covering the entire circumference of the flammable elongate body. If the heat-expandable refractory material does not cover the entire circumference of the combustible elongate body, the amount of the heat-expandable refractory material used may be reduced and the cost may be reduced.

  In addition, the conventionally proposed fire prevention treatment member has to open the slit to the width corresponding to the diameter of the flammable long body and then put it on the flammable long body. It was also found that there was a problem that the mounting work was troublesome.

  An object of the present invention is to use a fire-resistant long-body through-part fire prevention member that requires only a small amount of a heat-expandable refractory material and can be easily attached to a long-flammable body, and a fire-proof treatment structure using the same. Is to provide.

  The combustible elongate body penetration part fire prevention treatment member according to the present invention has an open tear that reaches from one end in the longitudinal direction to the other end, and only returns to its original shape when opened after spreading the tear by applying external force. It is made of a heat-expandable refractory material having a cross-section arc-like shape having spring elasticity, and the center angle of the heat-expandable refractory material when attached to the outer periphery of the combustible elongated body is in the range of 210 ° to 330 °. It is characterized by.

  Even if the fireproofing member is made of a heat-expandable fire-resistant material having a cross-section arc-shaped with an open crack, the center angle of the heat-expandable fire-resistant material (the angle covering the flammable long body) is 210 ° or more. The fireproof performance of the flammable elongated body penetrating portion can be ensured. In addition, if the center angle of the thermally expandable refractory material is 330 ° or less (the center angle of the crack is 30 ° or more), the crack is spread by pressing the crack against the flammable elongated body, so the fire-proofing member can be easily used. It can be attached to a flammable long body.

  In the fireproofing member according to the present invention, it is preferable that the center angle of the thermally expandable refractory material is 240 ° or more when mounted on the outer periphery of the combustible long body. If the central angle of the heat-expandable refractory material is 210 ° or more, the fire resistance performance of 1 hour can be ensured according to the Building Standard Law, but if it is less than 240 °, the heat-expanded refractory material completely encloses the molten portion of the flammable elongate body. Something that doesn't come up. If the center angle of the heat-expandable refractory material is 240 ° or more, the heat-expanded refractory material completely envelops the melted portion of the combustible elongate body, and the fire spread can be completely prevented. Therefore, the central angle of the thermally expandable refractory material is preferably 240 ° or more.

  Moreover, as for the fireproofing processing member which concerns on this invention, it is further more preferable that the center angle of the thermally expansible refractory material in the state with which it attached to the outer periphery of a combustible elongate body is 300 degrees or less. If the center angle of the heat-expandable refractory material is 330 ° or less and greater than 300 °, it is necessary to slightly open the tear in order to attach the fireproof member to the combustible elongated body. When the center angle of the heat-expandable refractory material is 300 ° or less (the center angle of the tear is 60 ° or more), the fireproof member can be attached to the combustible long body simply by pressing the tear against the combustible long body. . Therefore, the central angle of the thermally expandable refractory material is preferably 300 ° or less.

  Moreover, as for the fire prevention process member which concerns on this invention, it is still more preferable that the tear is formed diagonally with respect to the axis line.

  Further, the fireproof structure of the combustible elongated body penetrating portion according to the present invention uses any one of the above-mentioned fireproof treated members, and the outer periphery of the combustible elongated body that penetrates the opening of the fireproof compartment. And is positioned in the opening, and the void in the opening is filled with a non-combustible filler.

  Since the fireproof member according to the present invention is composed of a heat-expandable fire-resistant material having a cross-section arc-like shape having an open crack, it is possible to save the amount of heat-expandable fire-resistant material used by the width of the tear. it can. Specifically, the amount of thermally expandable refractory used can be reduced to 7/12 to 5/6 compared to the case where the entire circumference of the combustible elongate body is covered with the thermally expandable refractory, Accordingly, the material cost of the fireproofing member is reduced, and the cost can be reduced. In addition, when the crack of the fireproofing member is pressed against the combustible long body, the crack is restored to its original shape after spreading once, so that the fireproofing member can be easily attached to the outer periphery of the combustible long body.

  FIG. 1 (A) shows an embodiment of a combustible long-body through-part fire prevention treatment member according to the present invention. This fireproofing member 1 is composed of a heat-expandable refractory material 2 having a cross-sectional arc-like shape having an open split 3 that extends from one end to the other in the longitudinal direction. The heat-expandable refractory material is a thermoplastic resin blended with heat-expandable graphite and is conventionally used. The heat-expandable refractory material 2 having a cross-section arc-like shape has spring elasticity that returns to its original shape when an external force is applied and the tear 3 is opened after being opened. Further, the central angle α of the heat-expandable refractory material 2 having a cross-sectional arc is set in the range of 210 ° to 330 ° (the central angle of the crack 3 is 150 ° to 30 °). The inner diameter of the heat-expandable refractory material 2 having a cross-sectional arc is set to be the same as or slightly smaller than the outer diameter of the combustible elongate body to be mounted.

  Since this fireproofing member 1 is configured as described above, for example, when it is attached to a combustible long body such as a resin conduit or water pipe, as shown in FIG. 3 is pressed toward the combustible long body 4 in the direction of the arrow P, the tear 3 is expanded to the outer diameter of the combustible long body 4 and then restored to its original state by spring elasticity. As shown in (C), it can be attached to the outer periphery of the combustible elongated body 4. Therefore, the mounting operation can be performed very easily. In addition, after the mounting, a portion that is not covered with the heat-expandable refractory material 2 occurs, but if the center angle α of the heat-expandable refractory material 2 is 210 ° or more in a state of being mounted on the combustible elongated body 4, Experiments have confirmed that the fire performance required by the Building Standards Law is satisfied (described later).

  FIG. 2 shows a fireproofing structure using the fireproofing member 1 of FIG. In the figure, 5 is a fireproof compartment (for example, a wall) of a building, 6 is an opening formed in the fireproof compartment 5, 4 is a combustible long body that penetrates the opening 6, and 1 is a combustible long body. 4 is a fire-proofing member mounted on the outer periphery of 4. The combustible elongate body 4 is in the form of a water supply pipe composed of a resin inner pipe 4a and a sheath pipe 4b as shown in FIG. 2 (B), for example. The fire prevention member 1 is mounted on the outer periphery of the combustible elongated body 4 outside the opening 6 and then moved to be positioned in the opening 6. A space in the opening 6 is filled with a nonflammable filler 7 such as mortar or rock wool.

  If the flammable elongate body penetrating portion is structured as described above, a fire will occur on one side of the fireproof compartment 5 and if the flammable elongate body 4 burns, When the combustion reaches the fire prevention member 1, the heat-expandable refractory material 2 rapidly expands and envelops the combustion part and the melting part of the combustible long body 4. Can be stopped there. For this reason, it can prevent that the combustible elongate body 4 spreads to the opposite side of the fire prevention division body 5. FIG.

  In the embodiment of FIG. 2, the fireproofing member 1 is arranged so that one end face is exposed, but the fireproofing member 1 is placed so that both end faces are located in the nonflammable filler 7 such as mortar. Also good. However, if the fireproofing member 1 is arranged so that at least one end face is exposed, it is possible to visually check whether the fireproofing member 1 is embedded, which is convenient for inspection.

  Next, the trial manufacture and test results of the fireproof member that led to the completion of the present invention will be described. First, the following experiment was conducted in order to confirm that a predetermined fireproof performance can be obtained even if the crack of the fireproofing member is open. A fireproof member as shown in FIG. 1 (A) having a central angle α of 200 ° to 310 ° and different by 10 ° is manufactured by injection molding, and each fireproof member is made of a combustible elongated body. It was mounted on the outer periphery and a 1 hour fire resistance test for walls based on ISO834 was conducted. A water pipe with a sheath (nominal diameter 36, sheath outer diameter 42 mm) was used as the combustible long body. The fireproof member has an inner diameter of 42 mm, a thickness of 2 mm, a length of 50 mm, and a thermal expansion ratio of about 10 times. Table 1 shows the results of visual observation of the state of the test specimen during and after the test.

  In Table 1, until "60 minutes after the start of the test" is the result of observing the state under test from the non-heated side, and after "the end of the test", the penetration part was disassembled and the expansion state of the thermally expandable refractory material was observed It is the result. A circle indicates that the fire spread from the heating side to the non-heat side is completely stopped, and a cross indicates that the fire spread is not stopped. * 1 among the X marks is an example in which a hole penetrating the heated side and the non-heated side was generated and penetration of hot air was observed. In addition, ○ after the test is completed is an example in which the expanded refractory material completely wraps the molten part of the pipe and satisfies the fire prevention performance, × is an example in which the fire prevention performance is not satisfied, and △ is the Building Standard Act This is an example in which the above fire resistance performance for 1 hour is satisfied, but the expanded refractory material does not completely enclose the melted part of the piping after dismantling observation after the test.

  According to the results in Table 1, when the center angle α of the thermally expandable refractory material is 210 ° or more, the specified fire resistance performance for one hour is obtained, and when it is 240 ° or more, the expansion state of the thermally expandable refractory material is seen. It can be seen that more reliable fire resistance can be obtained. Therefore, the center angle α of the thermally expandable refractory material is preferably 210 ° or more, particularly 240 ° or more.

  Next, with the fire prevention member as shown in FIG. 1A, a fire prevention member having a central angle α of 180 ° to 350 ° that is different by 10 ° is manufactured by injection molding, and can be easily attached to a combustible long body. This was confirmed by experiments. As a combustible long body, a water pipe with a sheath (nominal diameter 36, sheath outer diameter 42 mm) was used, and a fireproof member having an inner diameter 42 mm, a thickness 2.0 mm, and a length 50 mm was used. Each prototype was attached to the piping as shown in FIGS. 1 (B) and (C). Table 2 shows the ease of attachment at this time and the stability of the attached state after attachment.

  In “Evaluation” in Table 2, “good” indicates that the product can be used without any problem in actual use, and “good” indicates that the product cannot be used but has some difficulty in actual use.

  According to this test result, the central angle α of the thermally expandable refractory material is in the range of 200 ° to 330 °, preferably in the range of 200 ° to 300 °, from the viewpoint of ease of attachment to piping and stability of the attachment state. You can see that

  Summing up the above test results, the central angle α in the state of being attached to the combustible long body of the thermally expandable refractory material may be 210 ° to 330 °, and the central angle α within this range is 240 °. It turns out that fireproof performance will become more reliable if it is above, and if it will be 300 degrees or less, the ease of attachment to a combustible elongate body will become better.

  In addition, although the experiment which changed the thickness of the fireproofing member was also conducted, the thickness of the fireproofing member can be 0.8 to 2.5 mm, and particularly around 2.0 mm is preferable. . The thickness of the fireproofing member is increased when the outer diameter of the combustible elongated body is large, and is decreased when the outer diameter is small. This is the same as in the prior art.

  FIG. 3 shows another embodiment of the fireproofing member according to the present invention. This fire-proofing member 1 is also formed in a cross-sectional arc-like shape so that the thermally expandable refractory material 2 has an open split 3 reaching from one end to the other in the longitudinal direction. The difference is that the tear 3 is formed obliquely with respect to the axis. With such a configuration, the spread of the flammable elongate body 4 proceeds in the longitudinal direction, whereas the position of the rift 3 of the thermally expandable refractory material 2 changes in the circumferential direction, so that it thermally expanded. It becomes easy for a refractory material to surround the combustion part and the fusion | melting part of the combustible elongate body 4, and it can improve fire prevention performance.

(A) is a perspective view which shows one Embodiment of the combustible elongate body penetration part fire prevention processing member which concerns on this invention, (B) is the state in the middle of mounting | wearing the combustible elongate body with the fire prevention processing member of (A). The front view which shows this, (C) is a front view which shows the state after mounting | wearing similarly. BRIEF DESCRIPTION OF THE DRAWINGS One embodiment of the combustible elongate body penetration part fire prevention processing structure which concerns on this invention is shown, (A) is sectional drawing, (B) is a front view. (A) is a perspective view which shows other embodiment of the combustible elongate body penetration part fire prevention processing member which concerns on this invention, (B) is the state which mounted | wore the combustible elongate body of the fire prevention processing member of (A). FIG.

Explanation of symbols

1: Fireproofing member 2: Thermally expandable refractory material 3: Open tear 4: Flammable long body 5: Fireproof compartment 6: Opening 7: Nonflammable filler such as mortar

Claims (5)

  It consists of a heat-expandable refractory material with a cross-section arc-like shape that has an open tear that reaches from one end to the other in the longitudinal direction, and has spring elasticity that returns to its original shape when it is opened after applying an external force to widen the tear. The center angle of the thermally expandable refractory material attached to the outer periphery of the combustible long body is in the range of 210 ° to 330 °.   The combustible elongated body penetration portion fireproofing member according to claim 1, wherein the center angle of the thermally expandable refractory material in a state of being mounted on the outer periphery of the combustible elongated body is 240 ° or more.   The center angle of the thermally expandable refractory material in a state of being mounted on the outer periphery of the combustible long body is 300 ° or less, and the combustible long body penetration part fireproofing member according to claim 1 or 2.   The flammable elongated body penetrating portion fireproofing member according to any one of claims 1 to 3, wherein the tear is formed obliquely with respect to the axis.   The fireproof member according to any one of claims 1 to 4 is attached to the outer periphery of a combustible elongated body that penetrates the opening of the fireproof compartment, and is positioned within the opening, and the nonflammable space in the opening is incombustible. A fireproof treatment structure for a flammable elongated body penetrating portion, which is filled with a combustible filler.

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