JPH03215336A - Refractory coated structure - Google Patents

Abstract

PURPOSE:To obtain a coated structure being readily worked on-site, having excellent heat insulating characteristics, fireproof characteristics and water resistance by coating the periphery of steel material with refractory prepared by mixing cement with vinyl chloride based resin containing rock wool and inorganic filler. CONSTITUTION:Refractory coated structure prepared by covering the periphery of steel material with the following refractory. The refractory to be used is a material obtained by blending cement with a vinyl chloride-based resin containing rock wool and an inorganic filler or a quasi-combustible material consisting essentially of chlorinated vinyl chloride-based resin, preferably a granular heat-insulating material made of foam. With the refractory coated structure, the refractory coated layer can be readily made into desired thickness, heat caused by fire is surely suppressed by the refractory coated layer mixed with the heat-insulating material and reduction in elastic coefficient such as elasticity and strength at yield point of steel material, etc., can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a structure in which the periphery of a steel material used in a building is coated with a fire-resistant material, and more specifically, it is easy to construct on-site, has excellent heat insulation performance, and is fireproof. It relates to a fire-resistant coating structure with excellent performance and water resistance.

Technical Background of the Invention A fire-resistant covering structure is a structure that protects steel structures from collapsing due to a fire that causes the temperature of the steel in beams and columns to rise and the elastic modulus and yield point strength to decrease. It is a structure in which steel is covered with a fire-resistant material, and the required fire-resistance performance is determined by the Building Standards Act depending on the location and number of floors of the building. This fireproof coating structure can be categorized by construction methods: the cast-in-place method, in which amorphous materials are mixed on-site, the prefabricated method, in which molded products are manufactured in advance at a factory and then installed on-site, and the prefabricated method, in which various materials are assembled. It is classified as a composite construction method that is constructed by denting, and these construction methods are selected taking into consideration the structure of the steel material, various conditions of the design plan, construction conditions at the site, cost, etc., but are relatively easy to construct. The cast-in-place method is widely used because it is highly versatile and cost-effective.

On the other hand, conventional fireproof materials used were a mixture of asbestos and cement, but as it became clear that they were harmful to the human body, in recent years fireproof materials such as rock wool, cement, and other firestones such as vermiculite and silica alumina have been used. A mixture of these is common.

When spraying such fireproof materials using the on-site casting method, the rock wool and cement to be used are mixed in advance, and then mixed with water at the nozzle tip using the principle of atomization when spraying compressed air. Although the spraying method is widely used, a method is also known in which rock wool and cement milk are combined at the tip of a nozzle during spraying.

However, in order to obtain the desired fire resistance or fire protection, the fire-resistant coating layer of the steel material constructed in this way requires the fire-resistant material to have a predetermined thickness (for example, 15 m+s).
For this reason, a covering layer of a predetermined thickness was formed by mixing a foaming material into the above-mentioned mixture of rock wool, cement, etc. and foaming it on site, but it was difficult to control the foaming rate on site. The problem was that it was difficult.

Further, there was also the problem that sufficient heat insulation properties could not be obtained with such a fireproof coating layer.

Purpose of the Invention The present invention has been made in order to eliminate the disadvantages of the prior art, and provides a fire-resistant covering structure that is easy to construct on-site, has excellent heat insulation performance, and is also excellent in fire prevention performance and water resistance. The purpose is to provide.

SUMMARY OF THE INVENTION To achieve the above object, the present invention is a fireproof coating method for covering steel materials etc. with a fireproof material, wherein the fireproof material contains at least rock wool and an inorganic filler in cement. This is a fireproof coating structure characterized by being mixed with a granular heat insulating material made of a quasi-inflammable or higher material, preferably a foam, whose main component is a vinyl chloride resin or a chlorinated vinyl chloride resin.

According to the fire-resistant coating structure according to the present invention, cement is made of a quasi-inflammable or higher material, preferably consisting of rock wool and vinyl chloride resin or chlorinated vinyl chloride resin containing an inorganic filler, in cement. Since the foam is mixed with a granular insulation material made by finely pulverizing the foam, it is easy to make the fireproof coating layer to a predetermined thickness, and the heat caused by a fire is reliably blocked by the fireproof coating layer mixed with the granular insulation material. It is possible to prevent the elastic modulus and yield point strength of steel materials from decreasing. Furthermore, a fireproof coating layer of a predetermined thickness can be obtained without using a foaming agent, and this coating layer has predetermined fire resistance and heat insulation properties, making on-site construction extremely easy. Furthermore, since the granular heat insulating material according to the present invention has excellent water resistance, it can improve the rust prevention performance of steel materials.

In addition, there is a fireproof coating structure in which the periphery of a steel material or the like is covered with a fireproof material, and the fireproof material is a vinyl chloride resin or a chlorinated vinyl chloride resin containing at least rock wool and an inorganic filler in cement. The above object can also be achieved by a fire-resistant coating structure characterized by being mixed with a granular heat insulating material made of a quasi-nonflammable or higher material whose main component is resin.

According to such a fireproof coating structure, in addition to the above-mentioned effects, since the granular heat insulating material functions as an aggregate of the fireproof coating layer, rock wool can be omitted and costs can be reduced.

DETAILED DESCRIPTION OF THE INVENTION The present invention will now be described in detail based on embodiments shown in the drawings.

The figure is a sectional view of a steel material (H steel) constructed using a fireproof coating structure according to an embodiment of the present invention.

As shown in the figure, a fireproof coating layer 2 is formed over the entire surface of the H steel 1. Note that the steel material according to the present invention is not limited to H steel, and may be other steel materials.

The fireproof coating layer 2 of this embodiment mainly consists of cement and sand, which are the materials constituting ordinary mortar, and rock wool 3 and a vinyl chloride resin or chlorinated vinyl chloride resin containing an inorganic filler. A granular heat insulating material 4 made by finely pulverizing a semi-nonflammable or higher material (preferably a foam) is mixed and kneaded. The rock wool 3 functions as an aggregate in the fireproof coating layer 2, and the granular heat insulating material 4 also functions as an aggregate since it has excellent mechanical strength as described later.

In this specification, the shape of the granular heat insulating material 2o is not particularly limited, and may be, for example, approximately spherical, rectangular parallelepiped, cubic, flaky, or a mixture thereof.

Such granular heat insulating material 4 may contain, for example, cutting waste generated during the production of semi-incombustible or higher foam products or crushed products of this foam as aggregate. Foam products can be obtained by forming a preform made of the above-mentioned materials and cutting it into a predetermined shape, or in doing so, a large amount of cutting waste and surplus insulation material are generated. Therefore, it is economical to use the cutting waste and the crushed portion obtained by crushing the surplus insulation material as a granular insulation material, which eliminates waste of materials.

Naturally, these materials include a mixture of flaky, approximately spherical, etc. crushed pieces and granules. Note that the material is not necessarily limited to foamed materials, and may be crushed waste of non-foamed materials.

The particle size of such granular heat insulating material 4 is 0.05 to 10 mm, preferably 0.1 mm to 7 mm, more preferably 0.0 mm to 7 mm, when its shape is considered to be spherical. 3
It's about 5+am. This is done considering the size of the sand or rock wool 3 that will be mixed at the same time.
This is to make the diameter the same as or smaller than that, and is also based on consideration of the diameter of the air gun or the thickness of the fireproof coating layer 2 that is normally applied. Note that if the particle size of the granular heat insulating material 4 is increased, it may be difficult to apply it with an air gun, so it is also possible to apply it by troweling.

The mixing ratio with cement is preferably about 25% for particles with a particle size of 1 mm, about 50% for particles with a particle size of 3I11m, and about 50% for particles with a particle size of 1 mm.
25% of particles with a particle size of 0.
5+I+I1, 1. 0 wm, 3, Om-, about 25% of the grain size of 0.5 mm, l. O
It is preferable to mix about 50% of the material with a diameter of 3.0 mm and about 25% of the material with a diameter of 3.0 mm.

The granular heat insulating material 4 is present in cement, sand, and rock wool 3, which are the materials that constitute normal mortar, and has a heat insulation and fire prevention function against heat from the outside. Even if the film is thinner than the conventional fireproof coating layer, it can sufficiently prevent the elastic modulus and yield point strength of the steel material from decreasing due to fire. Furthermore, since it has excellent water resistance, it also has the advantage of being able to prevent corrosion of steel materials.

It will be explained in further detail.

Semi-nonflammable or higher in the granular heat insulating material 4 means semi-nonflammable or nonflammable, respectively.
Ministry of Construction Notification No. 1372 of 1972, Ministry of Construction Notification No. 1 of 1970
Although stipulated in No. 828, in the present invention, a resin material whose main component is a vinyl chloride resin containing an inorganic filler or a chlorinated vinyl chloride resin, preferably a semi-nonflammable or higher granular heat insulating material. Finely pulverized foam is used.

For example, a granular insulation material made of foam has a compressive strength of 2
．． 3 kg/c or more, and the bending strength is 3.0 kg/c.
c1 or more, has excellent mechanical strength, and has a heat transfer coefficient of 0. 0 4 kcal/m-hr・”C
It has excellent heat insulation properties, has a water absorption rate of less than O, Ig/100c, has excellent water resistance, and has a moisture permeability coefficient of less than 0.03g/rd・h''・mmHg, and has excellent moisture resistance. is also excellent.

Here, it may be possible to use wood wool cement boards or phenol foam boards, which are more combustible than foamed polystyrene boards, as semi-incombustible or higher materials. It is undesirable because it corrodes iron and other materials due to surface and acidity.

In addition, conventionally known fibrous nonflammable insulation materials such as glass wool and rock wool have strength, water absorption,
Unfavorable in terms of moisture absorption.

Therefore, in the present invention, a resin material such as a foam whose main component is a vinyl chloride resin containing an inorganic filler or a chlorinated vinyl chloride resin is used as a semi-nonflammable or higher material.

The vinyl chloride resin (hereinafter referred to as PvC) used in the semi-nonflammable or higher granular heat insulating material 4 refers to polyvinyl chloride alone, a vinyl chloride copolymer containing 50% by weight or more of vinyl chloride, or polyvinyl chloride and chlorinated polyvinyl chloride. Vinyl-vinyl acetate copolymer, thermoplastic polyurethane, acrylonitrile-butadiene copolymer, chlorinated vinyl chloride resin, chlorinated polyethylene, methacrylic acid ester-acrylic ester copolymer, ethylene-vinyl acetate copolymer, vinyl chloride-vinylidene chloride A mixture with at least one resin that is compatible with polyvinyl chloride such as a copolymer,
Examples include mixtures in which the amount of polyvinyl chloride in the mixture is 50% by weight or more.

On the other hand, chlorinated vinyl chloride resin (hereinafter referred to as CPVC) is not only a resin obtained by chlorinating the PvC, but also a blending resin that is compatible with this CPVC, such as vinyl chloride resin, vinyl chloride-vinyl acetate. At least among copolymers, thermoplastic polyurethanes, acrylonitrile-butadiene copolymers, chlorinated polyethylene, methacrylic ester-acrylic ester copolymers, ethylene-vinyl acetate copolymers, vinyl chloride-vinylidene chloride copolymers, etc. The concept also includes a mixture with one or more types of blending resin, in which the amount of blending resin in the mixture is 50% by weight or less.

As the vinyl chloride resin to be chlorinated, in addition to PvC as described above, a copolymer containing 50% by weight or more of a vinyl chloride resin can also be used.

The chlorination method may be any conventionally known method, and for example, a photochlorination method under ultraviolet irradiation is suitably used.

Further, examples of the inorganic filler include inorganic fibrous materials and inorganic granular materials.

Among these, inorganic fibrous materials have a good volume retention effect when exposed to high temperatures.

This is because the inorganic fibrous material is intertwined with each other to form a network in the foam, and is therefore presumed to have excellent shape stability.

Inorganic fibrous materials include asbestos, glass fiber, rock wool, glass fiber, ceramic fiber, alumina fiber, carbon fiber, quartz fiber, boron fiber, and various metals with an average fiber length of 1 μm or more, preferably about 10 μm to 50 mm. Examples include fibers and various types of whiskers, and these fibers may be used alone or in combination of two or more types. However, when foaming a resin containing these inorganic materials, rock wool is most preferable from the viewpoint of ease of foam molding, various properties of the resulting foam, cost, etc. The inorganic particles have an average particle diameter of 0.01 to 300 μm, preferably 0.01 to 300 μm.
Talc, calcium carbonate, aluminum hydroxide, magnesium hydroxide, zinc oxide, mica, about 1 to 100 μm,
Bentonite, clay silica, etc. are suitable.

Furthermore, hollow bodies such as whitebait balloons can also be used as the inorganic particulates.

These inorganic fillers may be used alone or in combination of two or more.

The content of such an inorganic filler is determined by considering the amount to be contained in the resin material, the expansion ratio and cost when foaming the resin material, but usually PvC
and/or 2 parts by weight or more of inorganic fibers, preferably 5 parts by weight or more, based on 100 parts by weight of CPVC,
More preferably, the amount is 10 parts by weight or more. For inorganic particulates, the amount is 198 parts by weight or more, preferably 300 parts by weight or more. As the content of the inorganic filler increases, the obtained granular heat insulating material approaches non-flammability from semi-nonflammability.

Claims (1)

[Scope of Claims] 1) A fireproof covering structure in which a steel material or the like is surrounded by a fireproofing material, wherein the fireproofing material is a vinyl chloride resin containing at least rock wool and an inorganic filler in cement, or A fireproof coating structure characterized by being mixed with a granular heat insulating material made of a semi-nonflammable or higher material whose main component is chlorinated vinyl chloride resin. 2) A fire-resistant coating structure in which the surroundings of steel materials, etc. are covered with a fire-resistant material, the fire-resistant material mainly consisting of vinyl chloride resin or chlorinated vinyl chloride resin containing at least an inorganic filler in cement. A fireproof covering structure characterized by being mixed with a granular heat insulating material made of a semi-nonflammable or higher material.