JP2004218339A - Ventilation structure of eaves soffit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ventilation technology of an eaves soffit exhibiting fire protecting performance stabilized by effectively utilizing a thermal expansion material. <P>SOLUTION: The ventilation structure of the eaves soffit is so constituted that a ceiling board 60 of the eaves soffit is supportably fixed by using a supporting metal fitting 10 equipped with an insertion section 12 inserting the ceiling board 60, a ventilation flue 20 from an outdoor side to the eaves soffit through ventilating holes 26 and 26 or the like and a thermal expansion material 50 expanded by heat for closing the ventilation flue 20 and that the supporting metal fitting 10 is equipped with a regulation member 30 for regulating the expansion of the thermal expansion material 50. The regulation member 30 is a fire-proof material with permeability, and it is equipped with a mounting section 31 for mounting the regulation member 30 to the supporting metal fitting 10 and an abutting section 35 located outside the thermal expansion material 50 and controlling the expansion by making it abut on the expansion of the thermal expansion material 50. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a ventilation structure for a ceiling above an eaves, in which a ceiling plate is attached to a space between a tip of an eave of a roof and an outer wall of a building, a space behind a balcony, and the like, and a support bracket and a regulating member used therefor.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as this kind of ventilation structure for an eaves ceiling, for example, a structure shown in Patent Document 1 is known. The support fitting used for this ventilation structure is provided with an insertion recess having a substantially U-shaped cross section so that the end of the ceiling plate can be inserted. In addition, ventilation holes with many slits are provided on the upper and lower surfaces of the support bracket to allow ventilation to the eaves space, and ventilation between the outdoors and the eaves space is made through ventilation holes and ventilation passages. It is possible.
[0003]
In addition, the support fitting is provided with a thermal expansion material that expands without burning due to heat near the ventilation hole, and expands with hot air in the event of a fire to close the ventilation passage. It is configured not to invade.
[0004]
[Patent Document 1]
JP-A-6-73828 [0005]
[Problems to be solved by the invention]
By the way, when the thermal expansion material comes into contact with hot air and expands, the density of the thermal expansion material is reduced by an amount corresponding to the expansion, so that the thermal expansion material may become dusty. Then, the dusty thermal expansion material may be scattered by the hot air passing through the ventilation ventilation path, and the thermal expansion material may not be able to sufficiently exhibit the effect of closing the ventilation ventilation path.
[0006]
Therefore, an object of the present invention is to provide a ventilation technology for eaves ceilings that exhibits stable fire prevention performance by efficiently utilizing a thermal expansion material.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the first invention is directed to an insertion portion fixed to an outer wall to insert a ceiling plate, a ventilation passage from the outside to the ceiling through a ventilation hole, and a ventilation expandable by heat. A ventilation structure for a ceiling above the eaves in which a ceiling plate behind the eaves is supported and fixed by using a support fitting having a thermal expansion material that closes a ventilation path for use, and a regulating member for regulating expansion of the thermal expansion material. It is a ventilation structure of the ceiling behind the eaves equipped with a support bracket.
[0008]
According to a second aspect of the present invention, the restricting member is located outside the thermal expansion material and a mounting portion for mounting the restricting member to the support fitting, and restricts the expansion by abutting against the expansion of the thermal expansion material. And a contact portion that performs
[0009]
The third invention is characterized in that the regulating member is a refractory having air permeability, and the fourth invention is characterized in that the regulating member prevents the expansion of the thermal expansion material in the ventilation direction in the ventilation passage. It is characterized by regulation.
[0010]
[Action]
According to the first invention, the insertion portion fixed to the outer wall and into which the ceiling plate is inserted, the ventilation air passage that passes from the outside to the ceiling through the ventilation hole, and the heat that expands due to heat and closes the ventilation air passage. In the ventilation structure of the eaves ceiling where the ceiling plate behind the eaves is supported and fixed by using the support metal with the expansion material, the support metal is provided with a regulating member for restricting the expansion of the thermal expansion material. Thus, the expansion of the thermal expansion material is regulated, and the closed state of the ventilation passage is sufficiently exhibited by the effective expansion of the thermal expansion material.
[0011]
According to the second aspect, the restricting member is attached to the support fitting by the attaching portion, and regulates the expansion of the thermal expansion material by the contact portion located outside the thermal expansion material.
[0012]
According to the third invention, since the regulating member is a refractory having air permeability, it does not become an obstacle to ventilation through the ventilation passage at normal times, and when a fire or the like occurs, Regulates the expansion of the thermal expansion material.
[0013]
According to the fourth aspect, the regulating member regulates the expansion of the thermal expansion material in the ventilation direction in the ventilation ventilation path, thereby preventing the thermal expansion material from being diffused and scattered by hot air.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a support fitting 10 used in the ventilation structure for an eaves ceiling of the present invention. The support fitting 10 has an insertion recess 12 into which a nonflammable eaves ceiling plate 60 can be inserted, a ventilation passage 20 through which outside air passes, and a plurality of ventilation holes 26, 26,. And a piece 25.
[0015]
The upper surface of the insertion recess 12 is formed by a short piece 13 that protrudes obliquely downward and a long piece 14 that protrudes long, and the upper surface is formed in a substantially O-shape. A lower piece 16 is formed by folding back below the upper surface and extending horizontally. The short piece 13, the long piece 14, the first hanging piece 15, and the lower piece 16 constitute an insertion recess 12.
[0016]
An end of the lower piece 16 on the side opposite to the first hanging piece 15 is folded back below the lower piece 16 via a hanging second hanging piece 17 and extends horizontally, and a bottom surface 18 slightly longer than the lower piece 16 is formed. Is done. Further, a support piece 25 extending vertically is formed at an end of the bottom surface 18 opposite the second hanging piece 17 via a bent piece 27. A plurality of ventilation holes 26, 26,... And a plurality of outer wall fixing holes 28, 28,. Further, between the first vertical piece 15 and the support piece 25, there is formed a ventilation ventilation passage 20 through which the ventilation holes 26 can be ventilated by ventilation.
[0017]
The first hanging piece 15 is formed with a plurality of substantially L-shaped projecting pieces 29 at predetermined intervals. The thermal expansion material 50 is attached to the support fitting 10 so as to be sandwiched between the projecting pieces 29.
[0018]
Here, it is sufficient that the thermal expansion material 50 has a performance capable of expanding and closing the ventilation passage 20 without burning by heat. For example, there is an expanded graphite-based sealant for flame prevention and smoke prevention, and an expansion material that expands about 10 times at a passing hot air temperature of 150 to 170 ° C. In addition, a sealing material of vermiculite and ceramic fiber, a sealing material of expanded graphite and alumina trihydrate, a rubber-based sealing material, and the like can be used. Something can be used as appropriate. For example, Fibroc (trade name of Sekisui Chemical Co., Ltd.), Ultra GS (trade name of Sumitomo 3M Limited), and Vermoflex (trade name of Nichias Corporation) can be used.
[0019]
FIG. 2 shows the state of the thermal expansion material 50 when hot air enters the ventilation passage 20 from the ventilation holes 26, 26,... 2 (I) shows a state before the thermal expansion material 50 is expanded by contact with hot air, FIG. 2 (II) shows a state where the thermal expansion material 50 starts to expand by touching the hot air, and FIG. Respectively show a state in which the ventilation ventilation 20 is closed by the expansion of the air.
[0020]
As shown in FIGS. 2 (II) and 2 (III), the thermal expansion material 50 expands, and if the expansion proceeds as it is, the density of the thermal expansion material decreases, and the thermal expansion material 50 becomes dusty. The ventilation passage 20 has a ventilation direction in which hot air passes upward from ventilation holes 26, 26,. Therefore, as shown in FIG. 2 (III), the thermal expansion material 50 expands in the traveling direction of the hot air, that is, upward. Then, the thermal expansion material 50 that has expanded in the form of dust diffuses and scatters, so that the thermal expansion material cannot sufficiently exert the effect of closing the ventilation passage.
[0021]
On the other hand, the regulating member 30 of the present invention shown in FIG. The regulating member 30 has a substantially L-shape, and an attachment portion 31 for attaching the regulating member 30 to the support fitting 10 by being sandwiched between the first hanging piece 15 of the support fitting 10 and the thermal expansion material 50; And a contact portion 35 that is located above and outside of the contact member 50 and contacts the expansion of the thermal expansion material 50. Further, as the regulating member 30, a heat-resistant material having air permeability, for example, a stainless steel mesh material (SUS mesh), a perforated iron plate, or the like is used.
[0022]
FIG. 4 is a sectional view of the support fitting 10 to which the regulating member 30 is attached. Since the regulating member 30 has air permeability, it does not become an obstacle to the air passing through the ventilation hole 26 from the ventilation hole 26 in normal times. On the other hand, when hot air enters from the ventilation hole 26 due to a fire or the like, the thermal expansion material 50 abuts on the abutting portion 35 of the regulating member 30 due to expansion, and the upward expansion is regulated, as shown by the dashed line. It becomes swelling. For this reason, the thermal expansion material 50 is effectively expanded without diffusion, scattering, and the like, and can reliably block the ventilation passage 20.
[0023]
【The invention's effect】
According to the present invention, the following effects are obtained.
{Circle around (1)} The regulating member regulates the expansion of the thermal expansion material, so that the expansion and ventilation of the thermal expansion material is effectively prevented, whereby the ventilation air passage is reliably closed. As a result, the support fitting provided with the regulating member exhibits stable fire prevention performance.
{Circle around (2)} With a simple configuration in which the regulating member has the mounting portion and the contact portion, the expansion of the thermal expansion material can be regulated.
(3) Since the regulating member is made of a refractory material having air permeability, it does not hinder ventilation through the ventilation passage in normal times, and expands the thermal expansion material in the event of a fire or the like. Can be regulated.
{Circle around (4)} The regulating member regulates the expansion of the thermal expansion material in the ventilation direction in the ventilation ventilation path, so that diffusion and scattering due to the expansion of the thermal expansion material can be effectively prevented.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a support fitting.
FIG. 2 is an explanatory diagram showing a state of a thermal expansion material.
FIG. 3 is an explanatory view showing an embodiment of the present invention.
FIG. 4 is a sectional view showing an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Support bracket 12 Insertion part 20 Ventilation passage 26 Ventilation hole 30 Restriction member 31 Mounting part 35 Contact part 50 Thermal expansion material 60 Ceiling board

Claims (4)

Fixed to the outer wall,
An insertion part for inserting a ceiling plate,
Ventilation vents that pass through the ventilation holes from outside to the ceiling,
Using a support fitting with a thermal expansion material that expands due to heat and closes the ventilation path, the ceiling structure behind the eaves is fixed and supported,
Ventilation structure on the back of the eaves with a support member with a regulating member for regulating the expansion of the thermal expansion material. A regulating member, an attaching portion for attaching the regulating member to the support bracket,
The ventilation structure for an eaves ceiling according to claim 1, further comprising a contact portion located outside the thermal expansion material and configured to abut against the expansion of the thermal expansion material to control the expansion. 3. The ventilation structure according to claim 1, wherein the restricting member is a refractory having air permeability. The ventilation structure for an eaves ceiling according to any one of claims 1 to 3, wherein the regulating member regulates expansion of the thermal expansion material in a ventilation direction in the ventilation path.

Images