JPH0673828A - Ventilation structure of ceiling - Google Patents

Abstract

PURPOSE:To automatically close a ventilating air duct by installing on a wall surface, a ceiling plate support fitting having ventilating holes on the upper and lower surfaces thereof, inserting the side end edge of a nonflammable ceiling plate in the support fitting and providing a ventilating air duct having a nonflammable volume expansion material enclosed therein between both members. CONSTITUTION:A ceiling plate support fitting 1 is installed and fixed on a fire protecting wall surface 7 through a vis 10, and one side end edge of a nonflammable ceiling plate 5 is inserted in the ceiling plate support fitting 1 so that the ceiling plate 5 is supported by the bent projecting ribs 3, 4 thereof. Subsequently, a ventilating air duct 6 is formed between the ceiling plate 5 and the inner peripheral wall surface of the ceiling plate support fitting 1, and the other side end edge of the ceiling plate 5 is fitted in the recessed area 13 of a tip concealing plate 12 hung down from a roof 11 to assemble an eaves ceiling. In the normal condition, the ventilation for a garret is performed by upper and lower ventilating holes provided on the ceiling plate support fitting 1 and the ventilating air duct 6 provided in the interior thereof. When any fire occurs and the hot air about 150 deg.C or more starts to enter from the ventilating holes 2, a nonflammable volume expansion material 9 is expanded to close the ventilating air duct 6 so that entering of hot air is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation structure for the purpose of ventilating a ceiling such as an attic of a building, and more particularly to a ceiling ventilation structure capable of automatically shielding a ventilation air passage in the ceiling in case of a fire. It is about.

[0002]

2. Description of the Related Art As a conventional structure for attaching a ceiling plate to a ceiling through a ceiling plate support, for example, Japanese Patent Laid-Open No. 63-255
Japanese Patent No. 442 is known. This technique is a technique in which a ceiling plate supporter having a U-shaped cross section is attached to a wall surface of a building, and an end portion of the ceiling plate is inserted into the ceiling plate supporter to form a ceiling. Further, as a structure in which a ventilation hole is provided on the parting edge of the ceiling, for example, the actual open flat 2-689
No. 23 publication is known. This technique is a technique in which a mesh interposing material is integrally provided on a part of the parting edge that can support the ceiling plate, and thereby the ceiling is ventilated by the parting edge.

[0003]

However, the ceiling having a structure in which the ceiling board is supported by using the former ceiling board supporter having a U-shaped cross section has a simple structure and good workability. The ceiling of the structure used had the problem that ventilation was difficult. Also, when the ceiling is constructed by using the ceiling parting edge with mesh interposing material in the latter part, it is extremely convenient because ventilation can be done with the parting edge supporting the ceiling plate, but in the event of a fire There was a problem that the ventilation holes could not be closed automatically.

Therefore, when it is necessary to prevent fire in the case of a fire, it is common to attach a ventilation port with a damper that can be automatically closed at the heating temperature in the fire to a part of the ceiling. It was However, this ventilation port with a damper is relatively complicated and expensive, and in order to attach it to the ceiling, it is necessary to cut a part of the ceiling plate and assemble it, or to spend a lot of time on assembling the base of the attachment part. There was a problem that costly.

The ceiling ventilation structure according to the present invention is a completely new technology developed in view of the above-mentioned conventional problems.
In particular, a ventilation air passage is provided between the ceiling plate support bracket that supports the side edge of the ceiling plate and the ceiling plate, and at the time of a fire, a volume expansion material that can be expanded by heating temperature to close the ventilation air passage is ventilated. It provides a completely new technology for the air passage.

[0006]

A ventilation structure for a ceiling according to the present invention is a technique which has fundamentally improved the above-mentioned conventional problems, and the gist thereof is a ceiling plate support having a ventilation hole at a predetermined position. In a ceiling composed of a metal fitting and a non-combustible ceiling board supported by inserting side edges into the ceiling board support fitting, a ventilation air passage is provided between the non-combustible ceiling board and the ceiling board support fitting. And a non-combustible volume expansion material that expands due to heat is built in the ventilation air passage.

[0007]

In the present invention, as described above, the ventilation holes are provided in the ceiling plate support fitting, and the ventilation air is provided between the ceiling plate support fitting and the ceiling plate inserted in the ceiling plate support fitting. Since the passage is provided, the ceiling can be ventilated by these ventilation holes and the ventilation air passage. Further, the ceiling board is made of non-combustible material, and the ventilation air passage formed between the ceiling board and the ceiling board support fitting has a built-in non-combustible volume expansion material that expands due to heat, At the time of fire, this non-combustible volume expansion material expands due to heat, and the ventilation air passage can be automatically closed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the ventilation structure for a ceiling according to the present invention will be specifically described with reference to the drawings. FIG. 1 is a cross-sectional explanatory view of a main part showing an example of the ventilation structure for a ceiling according to the present invention, and FIG. Sectional drawing when the present invention is applied to an eaves ceiling, FIG. 3 is a perspective explanatory view of a main part of a ceiling plate support fitting, FIG.
(B), (C) is sectional explanatory drawing which shows the state of ventilation, and FIG. 5 is sectional explanatory drawing of another example.

1 to 3, reference numeral 1 denotes a ceiling plate supporting member having a U-shaped cross section, and a large number of ventilation holes 2 arranged in a strip shape are formed on the upper and lower surfaces thereof. Bending ribs 3 and 4 are provided at the entrance opening of the ceiling support fitting 1 so as to project toward the center, and by these bending ribs 3 and 4,
The side edges of the incombustible ceiling plate 5 inserted into the ceiling plate support fitting 1 can be clamped from above and below. Therefore, a constant gap, that is, a ventilation air passage 6 is provided between the tip end of the ceiling plate 5 inserted into the ceiling plate support fitting 1 and the inner peripheral surface of the inner portion of the ceiling plate support fitting 1. There is.

A screw hole 8 for attaching the ceiling plate support bracket 1 to the wall surface 7 of the building is provided in a projecting manner in the standing back wall of the ceiling plate support bracket 1. Further, the ceiling plate supporting member 1 facing a predetermined position of the inner peripheral wall of the ceiling plate supporting member 1, that is, the ventilation air passage 6 from the lower ventilation hole 2 provided in the ceiling plate supporting member 1 to the upper ventilation hole 2. A band-shaped noncombustible volume expansion material 9 that expands due to heat is provided on the inner wall of the.

In assembling and constructing an eaves ceiling using the ceiling ventilation structure according to the present invention, as shown in FIGS. 1 and 2, the ceiling plate support fitting 1 having the above-mentioned structure is provided with screws 10 on the fire wall. Attach and fix to 7. Next, one side edge of the non-combustible ceiling plate 5 is inserted into the ceiling plate support fitting 1 so that the bending ribs 3 and 4 support the ceiling board 5, and the ceiling board 5 and the ceiling board support fitting are supported. A ventilation air passage 6 having a width of about 6 mm is formed between the inner peripheral wall surface of 1 and the inner peripheral wall surface of 1.

The other edge of the ceiling plate 5 is fitted into the recess 13 of the nose tip concealing plate 12 suspended from the roof 11 to construct an eave ceiling. Since the ventilation structure for the ceiling according to the present invention has the above-mentioned structure, in the normal state, as shown in FIG.
As shown in (A), the upper and lower ventilation holes 2 provided in the ceiling plate support fitting 1 and the ventilation air passage 6 provided therein can ventilate the attic.

Next, when a fire occurs and hot air of about 150 ° C. or higher begins to infiltrate through the ventilation holes 2, as shown in FIG. As shown in FIG. 4C, the expanded noncombustible volume expandable material 9 completely closes the ventilation air passage 6 at a time, so that hot air can be prevented from entering the attic.

The non-combustible volume expansion material 9 used in the above embodiment is an expansive graphite-based flameproof and smokeproof sealing material which is generally used as a noncombustible volume expansion material. It has the property of expanding about 10 times at a temperature of 150 ° C to 170 ° C. Examples of the noncombustible volume expansion material include "Intumex" manufactured by Austria Chemie Linz GmbH, JP-B-63-132968 (fireproof composition of the invention), and JP-A-3-235 (invention). Products and technologies shown in the name Fireproof / Fireproof coated mats, etc. are used. Therefore, when the space of the ventilation air passage 6 is about 3 to 4 times that of the non-combustible volume expandable material 9 when the non-combustible volume expandable material 9 expands, it is used for ventilation in a high density state. The air passage 6 can be closed. In addition, this graphite-based material is non-flammable and the heating temperature is 850
It has the property of not burning or melting even at ℃. In the above-mentioned embodiment, the non-combustible volume expansion material 9 is attached to the inner peripheral wall surface of the ceiling board support 1, but the non-combustible volume expansion material 9 is one of the ceiling boards 5 as shown in FIG. It is also possible to embed it in the part and attach it.

[0015]

Since the ventilation structure for the ceiling according to the present invention has the above-described structure and operation, a ventilation device for fire protection can be easily constructed on the ceiling. Therefore, since it is not necessary to attach the ventilation opening with the fireproof damper as in the conventional case, it is possible to completely omit the work such as cutting the eaves ceiling board and assembling the foundation. Further, since the ceiling ventilation structure of the present invention can continuously provide ventilation openings around the ceiling, it is possible to perform a sufficient amount of ideal ventilation.

Further, since the ceiling ventilation structure according to the present invention has the above-mentioned structure, the ventilation air passage is completely closed in a short time at the same time when a fire occurs and hot air starts to be blown from the ventilation holes. It can be shut off. Moreover, since the ceiling ventilation structure of the present invention is provided as a parting along the wall, it has a feature that the structure can be made extremely excellent in terms of design.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view of a main part showing an example of a ventilation structure for a ceiling according to the present invention.

FIG. 2 is a cross-sectional explanatory view when the present invention is used for an eaves ceiling.

FIG. 3 is a perspective explanatory view of a main part of a ceiling board support fitting.

4 (A), (B) and (C) are cross-sectional explanatory views showing a ventilation state.

FIG. 5 is a cross-sectional explanatory view of another example.

[Explanation of symbols]

 1 Ceiling board support bracket 2 Ventilation hole 3,4 Bending rib 5 Ceiling board 6 Ventilation air passage 7 Wall surface 8 Screw hole 9 Non-combustible volume expansion material 10 Screw 11 Roof 12 Nose tip hiding plate 13 Recess

Claims (1)

[Claims] 1. A non-combustible ceiling comprising a ceiling plate support bracket having a ventilation hole at a predetermined position and a non-combustible ceiling plate supported by inserting side edges into the ceiling plate support bracket. A ventilation structure for the ceiling, wherein a ventilation air passage is provided between the plate and the ceiling plate support fitting, and a non-combustible volume expansion material that expands due to heat is built in the ventilation air passage. .