JPH0742299A - Ventilating construction in ceiling - Google Patents

Abstract

PURPOSE:To effectively do ventilation in a ceiling, by a method wherein ventilating air-passages communicating with the ceiling are formed between a metallic support for supporting the end-side edge of the ceiling board and a wall, and a nonflammable volume expansion member is provided within the air-passages. CONSTITUTION:Bent projection ribs 3, 4 are formed at an opening part of a metallic support 1 for a ceiling board, which support has a U-shaped section, and the end-side edge of a nonflammable ceiling board 2 is held between the bent projection ribs 3, 4. A recessed groove 5 is formed on the back of the metallic support 1, and a band-shaped volume expansion member 6, which expands by heating and is nonflammable, is provided within the recessed groove 5. After that, the metallic support 1 is fastened to a nonflammable wall 9 through spacers 7 and ventilating air- -passages 10 communicating with the ceiling are formed between the metallic support 1 and the nonflammable wall 9. Therefore, in time of fire, the expansion member 6 expands by heating and the air-passages 10 can be automatically closed.

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 a space above the ceiling 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 fire. It is about.

[0002]

2. Description of the Related Art As a conventional structure for attaching a ceiling plate to a ceiling via a ceiling plate support, for example, Japanese Patent Laid-Open No. 63-25 is available.
Japanese Patent No. 5442 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, an actual Kaihei 2-68
Japanese Patent No. 923 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, although 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, this technique is used. 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 wall, and a non-combustible volume expansion material that can be expanded at heating temperature to close the ventilation air passage when a fire occurs. It provides a completely new technology provided in the ventilation 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 supporting side edges of a ceiling plate. A ventilation air passage leading to the back of the ceiling is provided between the plate support metal member and the wall, and a non-combustible volume expansion material that expands by heat is built in the ventilation air passage. It has a ventilation structure.

[0007]

In the present invention, as described above, since the ventilation air passage is provided between the ceiling plate support fitting and the wall, the ventilation can be used to ventilate the ceiling. In addition, since the non-combustible volume expansion material that expands due to heat is built into the ventilation air passage formed between the ceiling plate support bracket and the wall, during a fire, this noncombustible volume expansion material expands due to heat. Then, 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 perspective explanatory view of a main part showing an example of the ventilation structure for a ceiling according to the present invention, and FIG. 1 is a cross-sectional explanatory view of FIG. 1, FIG. 3 is a perspective explanatory view showing a structure around a ceiling, FIG. 4 is a cross-sectional explanatory view of FIG. 3, FIG. 5 (A), (B),
(C) is an explanatory view showing a state in which the noncombustible volume expansion material expands, FIGS. 6 (A) and 6 (B) are explanatory views showing the ventilation structure of the second embodiment, and FIGS. 7 (A) and 7 (B) are It is explanatory drawing which shows the ventilation structure of 3rd Example.

In FIGS. 1 to 5 (A), (B), and (C), reference numeral 1 denotes a ceiling plate support fitting having a U-shaped cross section, which can support a side edge of the noncombustible ceiling plate 2. Is formed like a channel. At the entrance opening of this ceiling support bracket 1,
Bending protrusion ribs 3 and 4 are provided so as to protrude toward the center, respectively, and the side edges of the non-combustible ceiling plate 2 inserted into the ceiling plate support fitting 1 are vertically arranged by the bending protrusion ribs 3 and 4 from above and below. It is configured so that it can be held. Further, a concave groove 5 is provided on the back surface of the ceiling plate support fitting 1, and a band-shaped noncombustible volume expandable material 6 that expands by heat is built in the concave groove 5.

The ceiling plate support fitting 1 is attached to the noncombustible wall 9 via a spacer 7 and a screw 8. Therefore, by the spacer 7, the ventilation air passage 1 communicating between the ceiling plate support fitting 1 and the noncombustible wall 9 is communicated behind the ceiling.
0 is formed. Further, as described above, the incombustible volume expansion material 6 contained in the concave groove 5 of the ceiling plate support fitting 1 is provided facing the ventilation air passage 10. 11 in the figure
Is a roof, 12 is a nose cover plate, 13 is a pillar, and 14 is a cross member.

Since the ceiling ventilation structure according to the present invention has the above-mentioned structure, it is provided between the ceiling board support fitting 1 and the noncombustible wall 9 in a normal state as shown in FIGS. 1 to 4. The ventilation air passage 10 allows ventilation above the ceiling. Next, when a fire occurs and hot air of about 150 ° C. or higher begins to enter through the ventilation air passage 10, as shown in FIG.
As shown in (B), the noncombustible volume expandable material 6 starts to expand, and in a short time, the expanded noncombustible volume expandable material 6 completely closes the ventilation air passage 10. As a result, hot air can be prevented from entering the ceiling.

The noncombustible volume expandable material 6 used in the above embodiment is an expansive graphite-based sealant for flame and smoke prevention which is generally used as a noncombustible volume expandable material. It has the property of expanding about 10 times at a temperature of 150 ° C to 170 ° C. Examples of the non-combustible volume expansion material 6 include "Intumex" manufactured by Austria Chemie Linz GmbH, JP-B-63-132968 (fireproof composition of invention), and JP-A-3-235 (invention). The products and technologies shown in the name of fireproof / fireproof coated mat, etc. are used. Therefore, when the space of the ventilation air passage 10 is about 3 to 4 times that of the non-combustible volume expandable material 6 when the non-combustible volume expandable material 6 expands, it is used for ventilation in a high density state. The air passage 10 can be closed. Further, this graphite-based substance is nonflammable and has the property of not burning or melting even when the heating temperature reaches 850 ° C.

In the above embodiment, the ceiling plate support fitting 1
The recessed groove 5 is formed on the back surface of the, and the non-combustible volume expansion material 6 is built in the recessed groove 5. However, as shown in FIGS. 6A and 6B, the ceiling plate support in which the recessed groove 5 does not exist It is also possible to use the metal fitting 1 and to project and attach the non-combustible volume expansion material 6 on the smooth back surface thereof. Further, in the above-mentioned embodiment, the spacer 7 is interposed between the ceiling plate support fitting 1 and the non-combustible wall 9, and the ventilation air passage 10 is constituted by this spacer. ), Instead of the spacer 7, by interposing a C-channel type noncombustible insect repellent net 15 between the ceiling plate support fitting 1 and the noncombustible wall 9,
The ventilation air passage 10a can also be configured. In this case, the non-combustible volume expansion material 6 is built in the inner wall of the C-channel type non-combustible insect net 15, so that the ventilation air passage 10a can be closed at the time of fire.

[0014]

Since the ceiling ventilation structure according to the present invention has the above-mentioned structure and operation, it has the following great effects.

(1) Since the passage is formed between the ceiling plate supporting metal fittings for supporting the ceiling plate and the wall through a spacer or the like,
The ventilation air passage for the ceiling can be constructed with an extremely simple structure. (2) Therefore, since it is not necessary to provide a ventilation opening with a fire damper as in the conventional case, the work of cutting the eaves ceiling board and assembling the foundation can be omitted altogether. (3) 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. (4) Since the ventilation structure of the ceiling according to the present invention has the above-mentioned structure, a fire occurs and hot air starts to be blown from the ventilation holes, and at the same time, the ventilation air passage is completely closed and shielded. You can (5) 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 perspective explanatory view of a main part showing an example of a ceiling ventilation structure of the present invention.

FIG. 2 is a cross-sectional explanatory diagram of FIG.

FIG. 3 is a perspective view illustrating a structure around a ceiling.

4 is a cross-sectional explanatory diagram of FIG.

5 (A), (B), and (C) are explanatory views showing a state where a nonflammable volume expandable material expands.

6 (A) and 6 (B) are explanatory views showing a ventilation structure of a second embodiment.

7 (A) and 7 (B) are explanatory views showing a ventilation structure of a third embodiment.

[Explanation of symbols]

 1 Ceiling board support bracket 2 Non-combustible ceiling board 3,4 Bending protruding rib 5 Concave groove 6 Non-combustible volume expansion material 7 Spacer 8 Screw 9 Non-combustible wall 10,10a Ventilation air passage 11 Roof 12 Nose tip cover 13 Pillar 14 Yokosuka 15 C channel type non-combustible insect repellent net

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location E04B 1/94 G 9/00

Claims (1)

[Claims] 1. A ventilation air passage communicating with the back of the ceiling is provided between a ceiling plate support metal fitting for supporting side edges of the ceiling plate and a wall, and a non-combustible volume that expands due to heat in the ventilation air passage. A ceiling ventilation structure characterized by being built with an expansive material.