JPH0321149Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a cable support fitting for floor holes, which also provides fire and smoke prevention treatment for vertical main lines installed in structures such as buildings and condominiums.

[Conventional technology and its problems]

Conventionally, as shown in FIG. 5, a vertical trunk cable 1 is vertically laid from the top floor to the bottom through a floor hole 3 penetrating the slab 2 of each floor. The floor hole 3 must be backfilled for fire prevention measures, and was filled with concrete 4 and rock wool 5.

However, this process required a lot of effort and effort to close the ceilings on each floor. In addition, the electrical equipment technical standards state that the large tension due to the vertical main cable 1
In order to prevent this from occurring, it is specified that a vertical trunk cable 1 should be supported every 6 meters. Therefore, the vertical main cable 1 is supported by a support metal fitting 7 attached to the wall 6. With this support means, the supporting hardware 7 protrudes from the wall and becomes an obstruction, and it is also inconvenient for finishing the wall.

Furthermore, when using cable support fittings for floor holes to stuff rock wool or the like into the space for filling the fireproofing material, the work was troublesome and time-consuming because the shape of the rock wool was irregular.

Therefore, in Utility Application No. 54-134549 (see Utility Model Application No. 56-50878), the inventors of the present application used a fire-retardant treatment material 8 made of asbestos foam to shorten the work time, and used fire-retardant treatment and cables. Although we proposed a cable support fitting A for floor holes with a simple structure that also serves as support, the following new problems were raised (see Fig. 6).

That is, in this proposal, the support fittings A protrude above the floor, which spoils the aesthetics and is not desirable from a safety standpoint.Furthermore, in recent years, backfilling of the floor holes 3 has become a regular requirement, making it difficult to install the fittings. People are increasingly looking for things that can be backfilled together.

Furthermore, when a fire breaks out in a high-rise building or condominium, the wiring shafts and ducts of electric wires and cables are the best places to carry the flames and smoke, causing the spread of fire and fatal accidents due to smoke and toxic gases.

[Purpose of invention]

In view of the above points, the present invention provides a cable support fitting for floor holes that facilitates and cleans intermediate support for trunk cables routed in high-rise buildings, apartment buildings, etc., and is fireproof and smokeproof. The purpose is to

[Means to achieve the purpose]

In order to solve the above problem, the cable support fitting of the present invention includes a cup having a bracket on the inner periphery that fits into the floor hole, and a cable through hole in the bottom.
The cable is tightened with a bolt nut through a bushing, and consists of a cable fastener that engages with the bracket, asbestos foam stuffed into the bottom and top of the cup, and a resin mixture that hardens over time injected into the middle. The bushing is made of a material that turns into ceramic when exposed to high temperatures.

[Effect]

In the present invention constructed as described above, asbestos foam is placed at the bottom and top of the cup fitted into the floor hole, and a resin mixture that hardens over time is injected into the middle to provide fire resistance. The cable is supported by a bushing made of a material that imparts airtightness (smoke resistance) and turns into ceramic, and the cable is tightened with a clamp, and the clamp is engaged with a bracket provided on the inner surface of the cup to support the cable. Even if the part is exposed to fire, it will not be destroyed by fire, and furthermore, by attaching the supporting metal fitting of the present invention to the floor hole, the floor hole can be sealed (backfilled).

〔Example〕

Next, an embodiment of the present invention will be explained along with the accompanying drawings and the construction procedure.

Normally, a vertical trunk cable 1 installed in a high-rise building such as an apartment building penetrates the slab 2 of each floor through a floor hole 3, supports and fixes its tip to the floor or ceiling of the top floor, and then runs it sequentially along the lower floors. Support and fix each other.

The installation of the support fittings according to the present invention is carried out on a floor other than the top floor, and on that construction floor,
As shown in Figure 1, three trunk cables 1 (600V, 250mm ² triplex polyethylene insulated vinyl sheathed cables) passing through the floor hole 3 are
Cup 10 (outer diameter 150mmφ, inner diameter 144mmφ, depth
300mm structural steel) is passed through the through hole 11.
Also, the bottom of the cup 10 is filled with asbestos foam 13 (thickness 100 mm). Note that the through hole 11
It is preferable to protect the cable 1 by interposing a bushing 11'.

The cup 10 is slid back on the cable 1 and fitted into the floor hole 3, and the flange 14 at the upper end is engaged and fixed on the floor surface.

Next, a non-combustible cone 17 made of asbestos foam or the like as shown in FIG. inject,
Asbestos foam 16 is fitted on top of it.

The bushing 12 is made of a material that turns into ceramic when heated to a high temperature, for example, as described in Japanese Patent Publication No. 59-50181, by making a cut leading to the cable insertion hole 20 from the outer periphery or by cutting it into two parts so that the bushing 12 can be fitted to the cable 1. The cable 1 is made of a silicone composition, and even if exposed to fire, it will not burn out and turn into a ceramic, thereby causing no problem in supporting the cable 1 with a cable fastener 18, which will be described later.

Next, the bushing 12 is fitted onto the cable 1, the bushing 12 is held between the two-piece cable fasteners 18, and both metal fittings 18 are tightened with bolts. It engages with the bracket 19, supports the cable 1 on the cup 10 through the metal fitting 18, bushing 12, and bracket 19, and supports and fixes it on the slab 2, completing the cable support on the floor by the cable support metal fitting A of the present invention. .

Since the asbestos foams 13 and 16 are easily chipped, it is preferable to protect the outer surfaces by attaching glass fiber cloth or fire-resistant organic fiber cloth to the outer surfaces using a fire-resistant adhesive.

Furthermore, if there is one or two trunk cables 1, or three or more trunk cables, it is not necessary to fit the cone 17 if rock wool can be filled in the upper and lower parts of the gap and LCR 15 can be injected in the middle. .

[Efficacy confirmation test]

The cable support fitting A of the above embodiment was constructed into a chamber 23 (45 cm x 45 cm x 45 cm) as shown in Fig. 4, and the internal pressure was set to 400 mmAq, and the pressure drop after 60 minutes was 380 mmAq.

In addition, after exposing the bottom of the cup to a flame of 1050℃ for 3 hours using a burner conforming to IEEE std634, we dismantled it and observed the inside, and found that the part directly exposed to the flame had turned to ash, but the LCR15 smoke imparting material)
No abnormality was observed, and the bushings 12 were made of ceramic and continued to firmly support each cable 1.

〔effect〕

As explained above, according to the present invention, the cable is supported within the floor hole, so there is no need for backfilling, which improves work efficiency and makes it aesthetically pleasing.

In addition, asbestos foam is placed on the top and bottom of the cup,
Since LCR is injected in the middle, the LCR fills the gap in the support fittings, giving it an airtight structure, that is, smokeproofing, and the asbestos foam protects the LCR from fire, making it a fireproof structure. .

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of the cable support fitting according to the present invention in the construction state, Fig. 2 is a plan view of the main part of Fig. 1, Fig. 3 a and b are a plan view and a front view of the cone, and Fig. 4 is a The airtightness test explanatory drawings, FIGS. 5 and 6, are partially cutaway front views of each example of the conventional cable support fitting in the construction state. 1... Cable, 3... Floor hole, 10... Cup, 11... Cable through hole, 12... Bushing, 13... Asbestos foam, 15... Time curing resin mixture (LCR), 16... Asbestos foam, 17...
Cone, 18...Cable clamp, 19...Bracket.

Claims (1)

[Scope of utility model registration request] A cup having a bracket on the inner periphery and a cable through hole at the bottom that fits into the floor hole, a cable fastener that tightens the cable with a bolt and nut through the bushing and engages with the bracket, and a cable clamp on the bottom and top of the cup. A fireproof and smokeproof floor hole cable comprising an asbestos foam to be stuffed and a resin mixture that hardens over time injected into the middle, the bushing being made of a material that turns into ceramic when heated to high temperatures. Support metal fittings.