JPH0637145Y2 - Fireproof double ceiling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a fireproof double ceiling applied to an existing building having an existing communication cable in the lower vicinity of the main ceiling.

Conventional technology and its problems Many communication devices are usually installed in the equipment room of communication facilities such as telephone offices. Recent communication equipment is much more compact than conventional communication equipment and has improved processing capability. Therefore, if communication equipment is installed collectively, an open space will be created in the equipment room. It can be used as etc. However, the existing communication cables attached to the communication equipment are laid in large quantities near the bottom of the main ceiling, and it is difficult to move, which causes communication interruption, so it is unavoidable to use it as it is. .
The communication cable is more public than general electric wiring (power cable) such as lighting wiring, so it is necessary to take measures to protect it from fire.

As one of the countermeasures, it is possible to construct a fireproof ceiling below the main ceiling and protect the existing communication cable by the fireproof ceiling. In this case, the lighting fixture wiring and air-conditioning duct for office use will be arranged between the main ceiling and the fireproof ceiling. Due to the public nature of communication cables, sufficient safety measures are taken at the time of laying them, so regular inspections are not usually performed.However, when laying general electric wiring and air conditioning ducts, safety measures similar to communication cables are used. Since it has not been removed, maintenance and inspection are absolutely necessary. In this case, if the doors required for maintenance and inspection of the air-conditioning duct etc. are provided on the fireproof ceiling, the fire resistance deteriorates, and such doors cannot be practically formed from the viewpoint of fire resistance. In this case, it is necessary to break a part of the refractory ceiling at the time of maintenance and inspection of the air conditioning duct, wiring, etc., which not only increases the construction cost but also takes a long time to restore.
Incidentally, it is possible to form an entrance / exit with sufficient consideration of fire resistance, and the above problems can be solved by forming such an entrance / exit of fire resistance, but the entrance / exit is made into a fire resistant structure,
In order to prevent the spread of fire to the cable, the structure becomes considerably complicated such as ensuring airtightness, the construction cost is high, and there is a problem in practical implementation.

The present invention has been made for the purpose of eliminating such conventional problems.

Means for Solving the Problems The present invention is directed to a fireproof ceiling installed below an existing communication cable laid near the bottom of the main ceiling of an existing building, and an entrance / exit installed at intervals below the fireproof ceiling. And a general ceiling, and / or at least one of a general electric wiring such as an air conditioning duct and a wiring for lighting installed in a space between the fireproof ceiling and the general ceiling. Fireproof double ceiling.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the figure, (1) is a main ceiling of an existing building such as a telephone office, and communication devices (not shown) installed inside the building near the ceiling below the main ceiling (1). An existing communication cable (2) attached to the is attached.

In order to protect the existing communication cable (2) from fire, a fireproof ceiling (3) is constructed below the main ceiling (1).

When constructing the refractory ceiling (3), various refractory ceiling materials (31) such as calcium silicate molded plates are used, and the ceiling material (31) is a lightweight steel (32) as a ceiling substrate.
It is attached and fixed to. The ends of the shape steel (32) are fixed to, for example, a frame (not shown) of a pillar of a building. The shape steel (32) may be connected to the main ceiling (1) via bolts (33) for the purpose of increasing the strength of the ceiling base.

A general ceiling (4) is further constructed below the refractory ceiling (3), and a space is formed between both ceilings (3) and (4). In constructing the general ceiling (4), the general ceiling material (41) such as a wooden ceiling material or rock wool board is used. The ceiling material (41) is attached and fixed to the lightweight steel (42) as the ceiling base, as in the case of the refractory ceiling (3). (Four
3) is a bolt connecting the upper and lower shaped steels (32) and (42), and by rotating the nut (44) provided in the middle portion of the bolt (43), the general ceiling (4) The height is adjusted appropriately. (34) is a heat resistant caulking material filled in the bolt penetration part of the fire resistant ceiling (3).

An air conditioning duct (5) and other general electric wiring (not shown) are installed between the fireproof ceiling (3) and the general ceiling (4). Maintenance and inspection of such an air conditioning duct (5) and the like can be easily performed from an entrance (not shown) provided in the general ceiling (4) as in a normal general ceiling.

According to the fireproof double ceiling of the present invention, the fireproof ceiling (3) can protect the existing communication cable (2) laid near the lower portion of the main ceiling (1) from a fire.

Further, maintenance and inspection of the air conditioning duct (5) and the like can be easily performed through the doorway provided in the general ceiling (4), and it is not necessary to break a part of the fireproof ceiling (3) at all.

Effect As described above, the fireproof double ceiling of the present invention has the fireproof ceiling below the existing cable of the main ceiling and the general ceiling with an entrance and exit below the fireproof ceiling, and the air-conditioning duct between both ceilings. And / or general electric wiring such as lighting wiring is installed, so maintenance and inspection of air-conditioning ducts, etc. can be performed without fear of breaking the fireproof ceiling or lowering the fireproof performance of the fireproof ceiling. Can be performed easily, and is particularly useful when applied to a telephone office or the like when the free space is diverted to an office.

[Brief description of drawings]

The drawing is a partial sectional view schematically showing an embodiment of the present invention. In the figure, (1) is a main ceiling, (2) is an existing communication cable, (3) is a fireproof ceiling, (4) is a general ceiling, and (5) is an air conditioning duct.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Takero Kariya 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Norio Nagaoka 1-16-6 Uchisaiwai, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corp. (72) Inventor Michio Suzuki 1-10-20-4, Kameari, Katsushika-ku, Tokyo (56) References 59-158616 (JP, U) JP 60-50938 (JP) , B2) Sumiko Sho 56-28252 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A fireproof ceiling installed below an existing communication cable laid near the main ceiling of an existing building, a general ceiling with an entrance / exit installed below the fireproof ceiling, and a fireproof ceiling. And a general ceiling, and / or at least one of general electrical wiring such as wiring for lighting and wiring for lighting, and a fireproof double ceiling.