JPH0268076A - Fire prevention measure for opening part in fire prevention block - Google Patents

Abstract

PURPOSE:To always present constant fire preventing performance without presenting the condition of dispersion by mechanically pressurizing the side surface of a foaming body molding object, executing the exlargement and formation of a space part between an opening part, etc., and the foaming molding object, filling a fireproof filling material or a flameproof foamed molding body to the generated exlarging space part again and enclosing the space part. CONSTITUTION:An opening part 2 is bored to pass through a cable and an iron made sleve 3 is fitted to the internal surface of the opening part. Then, a lot of cables 4 are passed through the opening part and a bottom board, which is formed by a ceramic board, is set on the bottom board of the sleeve. After that, silicone foamed sticks 8, 8' and 8'' are stuffed into the opening part without intervals and the opening part is enclosed. Next, the side surface of the foamed stick is pressed by a presser 9 and a space part 10 is forcibly formed between the opening part and silicone foamed stick. Then, new silicone foamed sticks 11 and 11' are filled into the space part, which is formed in the above mentioned way, and the said space part is enclosed. After that, the said presser 9 is removed and a fire prevention measure is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of fire prevention measures for openings such as cable penetrations in floor walls of fireproof compartments.

(Prior Art) Conventionally, in fireproof compartments, as a fire prevention method for preventing the spread of fire through an opening provided in the floor or wall to allow cables to pass through, for example, a floor 111C was provided as shown in Fig. 1. A cable penetration sleeve 3 made of iron is placed on the inner surface of the opening 2 through which the cables pass, and after a number of cables 4t are passed through the hole, a bottom plate 5 made of ceramic board or the like is attached to the bottom of the sleeve. After ordering a flame-resistant foam liquid (for example, Silicone Foam SEP-1900 manufactured by Furukawa Electric Co., Ltd.) 6 on top of the foam, this is foamed and cured as shown in Figure 2, 7 and the opening is sealed. be.

This method has the advantage of not raising dust or noise during construction, and can be easily re-constructed. The two liquids A and B must be mixed and stirred at the metal construction site and injected into the above opening, and the temperature and mixing time (the most preferable temperature is 20 to 25°C) is required. The foaming time is 40 to 50 seconds) and the temperature of the materials to be injected, such as the bed and sleeve mentioned above, significantly affects the foaming state, and the foaming state varies significantly depending on these conditions, so it requires skill to adjust this. It was something.

In addition, although floor penetrations can be constructed even if there are problems as mentioned above, wall penetrations are more difficult to construct because the injection (filling) material is a liquid mixture. It was a lot of work.

Therefore, it is extremely difficult to satisfy all of these conditions at a construction site where construction work is labor intensive.Therefore, when foaming liquid is injected into the above opening and allowed to foam and harden, the foamed state may become unstable. This made it impossible to take uniform fire prevention measures.

(Problems to be Solved by the Invention) As a result of extensive research in view of the current situation, the present invention has been developed to provide fire protection for openings serving as fire prevention sensors, such as cable penetrations in fire protection compartments, without using an earth-resistant foam liquid. We have developed a fire prevention method that always exhibits a certain level of fire prevention performance without exhibiting any variation in the construction process.

(Means for Solving the Problems) The method of the present invention includes filling openings in the floor, walls, etc. of a fire protection compartment, as well as voids in penetration parts of cables, etc., with an earth-resistant foam. In the method for fire prevention measures by sealing the opening, after filling the opening, etc. with an earth-resistant foam molding,
The side surface of the foam molded product is mechanically pressurized to enlarge the opening, etc. to form a space between it and the foam molded product, and the created enlarged space is filled with a fire-resistant filler or earth-resistant foam again. It is characterized by filling and sealing the molded body.

The method of the present invention is to forcibly compress and fill the opening with a foam or an earth-resistant foam molded product that can be further foamed. It has the effect of significantly improving the airtightness and watertightness of In addition, in the event of a fire, it can also be effective in preventing smoke leakage (at relatively low temperatures). Then, in the event of a fire, these fillers expand in volume by 10 to 50 times, increasing the airtightness of the sealing part and exhibiting the effect of not only fireproofing performance but also blocking the passage of smoke.

In the method of the present invention, the term "opening" refers to an opening in a wall or floor of a fireproof compartment, or an opening in a wall or floor for passing a cable through.

An example of a flame-resistant foam molded product is silicone foam (manufactured by Furukawa Electric Co., Ltd., 5EP-1900) with a closed cell ratio of 50 cm and a specific gravity of 0.45'/oe, which expands in volume 10 to 50 times in the event of a fire. Use a material with excellent earth resistance, such as foamable earth resistance material rCMoz (manufactured by Bayer AG, West Germany).

Moreover, the foam molded product is filled along the height direction of the wall or floor. When a cable is passed through an opening in a wall or floor, the gap between the cable and the opening is filled in the direction of the cable penetration (height direction).

Furthermore, when filling and sealing the opening, it is not necessary to use the entire amount of the earth-resistant foam molding, and a portion of the earth-resistant non-compressible molding may be used, such as calcium silicate. From the viewpoint of workability, it is preferable to use the earth-resistant foam molding to cover at least the entire area of the opening. Further, after filling the opening with the molded earth-resistant foam, the upper surface may be further covered with an earth-resistant sheet, and by covering the outer surface with the sheet, the appearance is improved. At the same time, the airtightness of the opening can be further improved.

(Example) Example (1) As shown in diagram M3, floor 1 is 20 cm wide x 40 cm long
A steel sleeve 3 is attached to the inner surface of the opening, a large number of cables 4 are passed through the opening, and a ceramic board (Furukawa Electric Co., Ltd.) is attached to the bottom of the sleeve. Install a bottom plate 5'jfr made of ceramic board (made by Similex). After that, a 5X5X150fi silicone foam rod (5EP-1900 manufactured by Furukawa Electric, closed cell ratio of about 50%, specific gravity of about 0.4:!i/Go) 8*8'+8" was stuffed into the opening without any gaps. Seal it.

Next, as shown in FIG. 4, a pressure machine 9 is used to press the foam rod from the side surface to forcibly form a space 10 between the opening and the silicone foam rod, and a fifth As shown in the figure, after filling the space with new silicone foam rods 11 and IJ' and sealing the space, the pressurizer 9 was removed to complete the fire prevention measures according to the method of the present invention.

The cables used for the test specimen were 23 CV60, V
20 V 2 +m2X 7-core wires were used. Combustion conditions are 2 hours (maximum 10
10°C). The condition of the penetration part during the experiment was that there was no smoke passing through or fire spreading to the anti-fire side (low temperature side), and the cable's maximum temperature was 265 degrees Celsius, confirming sufficient performance as a fire prevention measure for the penetration part of the fireproof compartment.

Example (2) A rod-shaped body of FOMOX (manufactured by 9INIL GmbH, West Germany) of the same size for initial filling as the earth-resistant molded body in Example (1) was forcibly produced using an encircling pressure machine. A fire prevention method according to the method of the present invention was carried out in the same manner as in Example (1) except that a calcium silicate rod was used to additionally fill the space.

(Effects of the Invention) As detailed above, according to the fire prevention method of the present invention, openings such as cable penetrations in fire protection compartments can be formed in a uniform state with high fire prevention performance at all times with simple work on site. Indeed, its practical effects are extremely large.

[Brief explanation of the drawing]

1 and 2 are schematic explanatory diagrams of a conventional fire prevention method for an opening, and FIGS. 3 to 5 are schematic diagrams for explaining a fire prevention method for an opening according to the present invention. 1...floor, 2...opening, 3...sleeve, 4...
Cable, 5... Bottom plate, 6... Foaming liquid, 7...
Foam, 8° 8', 8"... Earth-resistant foam molding, 9
... Pressurizer, 10... Space section, 11, 11'...
・Additionally filled earth-resistant foam molding. Applicant's agent: Patent attorney Takehiko Dosu Figure 1 Figure 2 Procedural amendment 1, case description Patent application No. 63-220231 3゜ Title of invention Case for amending the method of fire prevention measures for openings in fire prevention compartments Relationship with Patent Applicant (529) Furukawa Electric Co., Ltd. 4, Agent 3-7-2-7 Kasumigaseki, Chiyoda-ku, Tokyo, Contents of Amendment (1) The scope of the patent claims will be amended as shown in the attached sheet. (2) In the specification, page 5, lines 8 to 9, the phrase "expands by 10 to 50 times in the event of a fire" is replaced with "expands in volume by 2 to 50 times in the event of a fire." I am corrected. (3) In the same article, page 5, lines 18 to 20, the phrase ``may be used as a portion of...'' was replaced with ``as a portion of, for example, calcium silicate plate, rock wool, etc.'' However, a refractory filler such as ceramic wool may be used.'' 2. Claims: A method for fire prevention measures, in which openings in floors, walls, etc. of a fireproof compartment, as well as voids in penetration parts of cables, etc., are filled with explosion-resistant foam to seal said openings or voids. After filling the opening or void with the explosion-resistant foam molding, mechanical pressure is applied to the side surface of the foam-resistant molding to create a space between the opening or void and the foam molding. 1. A method for fire prevention measures for an opening in a fire protection compartment, which comprises enlarging the opening of a fireproof compartment, and filling the expanded space again with an explosion-resistant foam molding or a fire-resistant filler to seal it.

Claims (1)

[Claims] In a fire prevention method in which openings in floors, walls, etc. of a fireproof compartment, as well as gaps in penetration parts of cables, etc., are filled with flame-resistant foam to seal the openings or gaps, the openings or gaps are sealed. After filling the flame-resistant foam molding into the foam molding, mechanically pressurizing the side surface of the foam molding to enlarge and form a space between the opening or void and the foam molding, A method for fire prevention measures for an opening in a fire protection compartment, which comprises filling the expanded space again with a flame-resistant foam molding and sealing it.