JP3268024B2 - Ceiling ventilation structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art A conventional structure for attaching a ceiling plate to a ceiling via a ceiling plate support is disclosed in, for example, JP-A-63-255.
No. 442 is known. In this technique, a ceiling plate support having a U-shaped cross section is attached to a wall surface of a building, and an end of the ceiling plate is inserted into the ceiling plate support to form a ceiling.

Further, as a structure in which a ventilation hole is provided at a parting edge of a ceiling, for example, Japanese Utility Model Laid-Open No. 2-68923 is known. This technique is a technique in which a mesh interposer is integrally provided at a part of a parting edge capable of supporting a ceiling plate, thereby ventilating the ceiling at the parting edge of the ceiling.

[0004]

The ceiling of the former structure, in which the ceiling plate is supported by using the ceiling plate support having a U-shaped cross section, has a simple structure and good workability. There was a problem that the ceiling of the structure was difficult to ventilate. In the case where the ceiling is constructed using a ceiling parting edge having a mesh interposer in part of the latter, ventilation is possible with the parting edge supporting the ceiling plate, which is extremely convenient. There was a problem that the ventilation holes could not be closed automatically.

Therefore, conventionally, when fire protection is required in the past, it is common to install a ventilation port with a damper at a part of the ceiling, which can be automatically closed at the heating temperature at the time of the fire. Was. However, the ventilation port with the damper is relatively complicated and expensive, and in order to mount it on the ceiling, it is necessary to cut a part of the ceiling plate and incorporate it, and it takes much time to assemble the base of the mounting part. And costly.

[0006] The ceiling ventilation structure according to the present invention is a completely new technique developed in view of the above-mentioned conventional problems,
In particular, a ventilation air passage is provided between the ceiling plate and the ceiling plate supporting the side edges of the ceiling plate, and a volume expansion material that can be expanded at a heated temperature to close the ventilation air passage in the event of a fire. It provides a completely new technology provided in the air passage.

[0007]

SUMMARY OF THE INVENTION The ceiling ventilation structure according to the present invention is a technique for fundamentally improving the above-mentioned conventional problems, and the gist of the invention is that ceiling plates are provided above and below an entrance opening. Side edges of the non-combustible ceiling plate are inserted and supported to a predetermined depth in ceiling plate support fittings having a U-shaped cross section, each of which is provided with a bent protruding rib capable of holding the ceiling plate support. A bent step is provided substantially in the center of the lower surface of the fitting in parallel with the entrance opening, and a non-combustible volume expansion material is attached to a lower part of the bent step. A large number of ventilation holes are respectively provided near the entrance opening and at predetermined positions on the upper surface, and between the ceiling plate support and the side edge of the non-combustible ceiling plate, the ventilation holes on the lower surface to the ventilation holes on the upper surface are provided. The ventilation air passage having a U-shaped cross section communicating with the It is the ceiling of the ventilation structure that was.

In the present invention, as described above, the side edge of the ceiling plate is inserted to a predetermined depth into a ceiling plate support bracket having a U-shaped cross section in which bent protrusion ribs are projected above and below the entrance opening. With this configuration, a gap space having a U-shaped cross section can be easily and automatically formed between the ceiling plate support bracket and the ceiling plate.

Further, since a large number of ventilation holes are provided in the vicinity of the entrance opening on the lower surface of the ceiling plate support bracket and at predetermined positions on the upper surface, respectively, a ventilation hole having a U-shaped cross section communicating from the ventilation hole on the lower surface to the ventilation hole on the upper surface is provided. An air passage can be formed, thereby forming a maze inside the passage, preventing a large amount of wind and rain from entering during a typhoon or the like, and easily allowing hot wind or fire to enter during a fire. Can be prevented.

In the present invention, as described above, a bent step portion is provided substantially at the center of the ceiling plate support bracket, and a noncombustible volume expansion material is attached to the lower portion thereof. The inflatable material can be stably mounted and fixed, and the incombustible volume expander can be prevented from obstructing the flow of air in the ventilation air passage. Further, since the non-combustible volume expanding material is mounted near the ventilation hole provided at the entrance opening on the lower surface of the ceiling plate support bracket, immediately when hot air or flame enters from this ventilation hole, The inflation of the ventilation air passage can be closed at a predetermined stage of the fire by expanding.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an essential part of an example of a ceiling ventilation structure according to the present invention; FIG. FIG. 3 is a cross-sectional explanatory view of the case where the present invention is used for an eave ceiling, and FIG.
(B) and (C) are cross-sectional explanatory views showing a state of ventilation, and FIG. 5 is a cross-sectional explanatory view of another example.

In FIG. 1 to FIG. 3, reference numeral 1 denotes a ceiling plate supporting bracket having a U-shaped cross section. Ventilation holes 2 are formed. At the entrance opening of the ceiling support 1, bent ribs 3, 4 are provided on both sides toward the center, respectively, and the ceiling plate support 1 is formed by these bent ribs 3, 4. The side edges of the non-combustible ceiling plate 5 inserted into the ceiling plate 5 can be sandwiched from above and below.

As described above, the ceiling plate support 1 having a U-shaped cross section
The bent ribs 3, 4 protruding from both sides of the entrance opening have elasticity, so that even if the thickness of the ceiling plate 5 is somewhat different, the bent ribs 3, 4 can be formed. Can be pinched and fixed.

The side edge of the ceiling plate 5 inserted into the entrance opening of the ceiling plate supporting bracket 1 having a U-shaped cross section is clamped and fixed by the bent protruding ribs 3 and 4 as described above. A substantially U-shaped clearance space is automatically formed between the upper surface, the end surface, and the lower surface of the side edge of the ceiling plate 5 inserted into the metal fitting 1 and the inner peripheral surface at the back of the ceiling plate supporting metal fitting 1. The space forms a ventilation air passage 6 having a U-shaped cross section communicating from the lower ventilation hole 2 to the upper ventilation hole 2.

A screw hole 8 for attaching the ceiling plate support 1 to a wall surface 7 of a building is formed in the upright inner wall of the ceiling plate support 1. In addition, a predetermined position on the inner peripheral wall of the ceiling plate support 1, that is, the ventilation air passage 6 from the lower ventilation hole 2 provided on the lower surface of the ceiling plate support 1 to the upper ventilation hole 2 provided on the upper surface. A strip-shaped noncombustible volume expansion material 9 which expands by heat is provided on the inner wall of the ceiling plate supporting bracket 1 facing. In particular, as shown in FIG.
Is mounted and fixed in a stable manner at the lower part of the bent step provided substantially at the center of the lower surface of the ceiling plate support 1.

In assembling and constructing the eaves ceiling using the ceiling ventilation structure according to the present invention, as shown in FIGS. 7 and fix it. Next, one side edge of the non-combustible ceiling plate 5 is inserted into the ceiling plate support 1 to support the ceiling plate 5 with the bent protruding ribs 3 and 4, and the side edge of the ceiling plate 5 A substantially U-shaped ventilation air passage 6 having a width of about 6 mm is formed between the upper surface, the end surface, and the lower surface and the inner peripheral wall surface of the ceiling plate support 1.

The other edge of the ceiling plate 5 is fitted into a recess 13 of the nose cover 12 suspended from the roof 11 to assemble the eaves ceiling. Since the ceiling ventilation structure according to the present invention has the above-described structure, in a normal state, FIG.
As shown in FIG. 1A, the back of the cabin can be ventilated by the upper and lower ventilation holes 2 provided in the ceiling plate support 1 and the ventilation air passage 6 provided therein.

Next, when a fire occurs and hot air of about 150 ° C. or more starts to enter the ventilation hole 2, the non-combustible volume expanding material 9 starts expanding as shown in FIG. At time, as shown in FIG. 4 (C), the expanded non-combustible volume expanding material 9 completely closes the ventilation air passage 6, thereby preventing hot air from entering the back of the cabin. Therefore, the ventilation air passage 6 is closed at an early stage of the fire, so that it is possible to prevent an increase in disaster.

In the present invention, in particular, FIGS.
(A), (B), (C), or as illustrated in FIG. 5, a non-combustible volume expansion material 9 is mounted near the ventilation hole 2 provided on the lower surface of the ceiling plate support 1, that is, The non-combustible volume expander 9 is expanded near the entrance of the ventilation air passage 6 when the flame or hot air reaches the entrance of the ventilation air passage 6, whereby the ventilation air passage 6 is closed. It is configured to be able to close.

The non-combustible volume expander 9 used in the above embodiment is an expandable graphite-based flame-proof and smoke-proof seal material generally used as a non-combustible volume expander. It has the property of expanding about 10 times at a temperature of 150 to 170 ° C. Examples of the non-combustible volume expansion material include "Intzmex" manufactured by Austrian Chemie Linz Co., Ltd., and JP-B-63-132968 (the name of a fire-retardant composition of the invention) and JP-A-3-235 (the invention). Products and technologies shown under the name of “Fireproof / fireproof covering mat” etc. are used.

Therefore, when the space of the ventilation air passage 6 is about 3 to 4 times the space of the non-combustible volume expansion material 9 when the non-combustible volume expansion material 9 is expanded, the high density state With this, the ventilation air passage 6 can be closed. In addition, this graphite-based substance has noncombustibility and a heating temperature of 8%.
It does not burn or melt even at 50 ° C. In the above embodiment, the non-combustible volume expansion material 9 is attached to the inner peripheral wall surface of the ceiling plate support 1, but the non-combustible volume expansion material 9 is, as illustrated in FIG. It is also possible to bury it in the part and attach it.

[0022]

According to the present invention, as described above, the side edge of the ceiling plate is set to a predetermined depth in a ceiling plate support bracket having a U-shaped cross section in which bent protrusion ribs are projected above and below the entrance opening. Since it is configured by being inserted, there is an effect that a gap space having a U-shaped cross section can be easily and automatically formed between the ceiling plate support bracket and the ceiling plate.

Further, since a large number of ventilation holes are respectively provided at the entrance opening on the lower surface of the ceiling plate support bracket and at predetermined positions on the upper surface, ventilation having a U-shaped cross section communicating from the ventilation hole on the lower surface to the ventilation hole on the upper surface. Air passage can be formed, thereby forming a maze inside the passage, preventing a large amount of wind and rain from entering during a typhoon or the like, and easily introducing hot wind or fire during a fire It also has a great effect such as being able to prevent this.

In the present invention, as described above, the bent step portion is provided substantially at the center of the ceiling plate support bracket, and the incombustible volume expansion material is attached to the lower portion thereof. The inflatable material can be stably mounted and fixed, and the incombustible volume expander can be prevented from obstructing the flow of air in the ventilation air passage. Further, since the non-combustible volume expanding material is mounted near the ventilation hole provided at the entrance opening on the lower surface of the ceiling plate support bracket, immediately when hot air or flame enters from this ventilation hole, It also has the effect of being able to expand and close the entrance of the ventilation air passage at a predetermined stage of the fire.

[Brief description of the drawings]

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

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

FIG. 3 is an explanatory perspective view of a main part of a ceiling plate support.

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Ceiling board support fitting 2 ... Ventilation hole 3 ... Bending rib 4 ... Bending rib 5 ... Ceiling plate 6 ... Ventilation air passage 7 ... Wall surface 8 ... Screw hole 9 ... Noncombustible volume expansion material 10 ... Screw 11 ... roof 12 ... nose cover 13 ... recess

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-51-32009 (JP, A) JP-A-51-49518 (JP, A) Fully open 1984-65136 (JP, U) Really open 1962 187111 (JP, U) Japanese Utility Model 1-61309 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) E04B 9/02 E04B 1/94

Claims (1)

(57) [Claims] 1. A side edge of a non-combustible ceiling plate having a U-shaped cross-section is provided in a ceiling plate support bracket having a U-shaped cross section in which bent ribs capable of sandwiching the ceiling plate are provided above and below the entrance opening. A bent step is provided in parallel with the entrance opening substantially at the center of the lower surface of the ceiling plate support bracket, and a non-combustible volume expansion material is provided at a lower part of the bent step. Are attached, and a number of ventilation holes are provided near the entrance opening on the lower surface of the ceiling plate support and at predetermined positions on the upper surface, respectively, and side edges of the ceiling plate support and the non-combustible ceiling plate are provided. A ventilation air passage having a U-shaped cross section communicating from the ventilation hole on the lower surface to the ventilation hole on the upper surface.