JPH0713380B2 - Steel frame fireproof coating method and fireproof coating material for construction - Google Patents

Description

TECHNICAL FIELD The present invention relates to a fireproof coating method for constructing a steel frame of a building and a fireproof coating material for construction used in this method.

"Prior Art" Generally, in a building structure having a steel frame structure, a fireproof coating is applied to the steel frame. The conventional fire-resistant coating method for steel frames is a method in which a mixture of rock wool (rock wool) and cement is directly sprayed onto the steel frame, and a fire-resistant coating material called loosely sprayed rock wool is formed around the steel frame. Is.

"Problems to be solved by the invention" By the way, since the conventional fireproof coating method is a method of directly spraying rock wool onto a steel frame, a lot of dust is generated during this spraying work, and the working conditions are There was a problem of causing deterioration. Further, it is said that there is a risk of carcinogenicity to workers when workers inhale this dust. Furthermore, since this fireproof coating method is basically a work after the steel frame is erected at a construction site, it takes a long period of time and the quality of the sprayed rock wool is not stable,
At times, there was a problem that the conditions for certifying the thickness and bulk specific gravity of the fireproof coating material, which were established by the Building Standards Act, etc., were not satisfied. And since more rock wool than necessary is sprayed in order to avoid uneven thickness of this sprayed rock wool,
There was a problem that the required thickness for constructing the fireproof coating would inevitably increase.

This invention, in the fireproof coating method to be applied to the building structure of the steel frame structure, it is possible to shorten the construction period without the risk of deteriorating the working conditions, and the quality and thickness of the fireproof coating material. The problem is how to realize a fireproof coating method capable of stabilizing the thickness and reducing the required thickness of the fireproof coating material, and a fireproof coating material for construction used in the method.

"Means for Solving the Problems" Of the present invention, the first invention is to attach a flexible long sheet-shaped fireproof coating material around a steel frame by spirally winding without gaps. The entire surface of the steel frame is coated by the above method.

A second invention is the fireproof coating material used in the first invention, wherein the binder is a binder such as silicone,
Flexible by dispersing at least one inorganic material of low thermal conductivity inorganic material such as rock wool, high endothermic inorganic material such as borax, expansive inorganic material such as graphite, and heat resistance improving inorganic material such as calcium carbonate It is characterized in that it is formed in the form of a long sheet having a single-layer structure having.

[Operation] In the first aspect of the present invention, the fireproof coating applied to the steel frame is a flexible sheet-shaped multi-functional fireproof coating spiraled around the steel frame before the steel frame is erected. It is configured by winding in a shape.

Further, in the second invention, the fireproof coating material is formed into a flexible sheet shape that can be easily wound around a steel frame,
Various inorganic materials corresponding to the effect required as the fireproof coating material are effectively mixed in the fireproof coating material.

[Examples] Examples of the present invention will be described below with reference to the drawings.

FIG. 1 to FIG. 3 are views showing a building structure of a steel frame structure to which the steel frame fireproof coating method according to the first embodiment of the present invention is applied. In FIGS. 1 to 3, reference numeral 1 is a column made of steel pipe, and reference numeral 2 is a beam made of H-shaped steel. The column 1 is provided with a diaphragm 4 at a joint (joint) 3 with the beam 2, and the diaphragm 4 and the beams 2, 2,
Attaching plates 5, 5, ... Are provided at the joint portion with.
Around the pillar 1, a flexible sheet-shaped fireproof coating material 6 which is molded at the factory is spirally wound and affixed between the joint portions 3, 3 in a spiral shape. As a result, the pillar 1 is provided with a fireproof coating. Concrete 7 is cast on the upper portion of the beam 2 and the diaphragm 4.

Here, an embodiment of the second invention of the present invention,
The structure of the fireproof coating material 6 will be described. Fireproof coating 6
When, for example, a steel frame such as a pillar is exposed to high heat due to a fire or the like, it is provided around the steel frame for the purpose of protecting the steel frame from the high heat. Therefore, the properties required for the refractory coating material 6 include a) low temperature conductivity, b) high heat absorption, and c) expansivity. Therefore, a method is conceivable in which materials having each of these properties are mixed and molded into a long sheet having a single-layer structure with a flexible binder to form a fireproof coating material. At this time, since each constituent material is organic and there is concern about durability, the material is selected only for the inorganic material. It is also conceivable to mix a heat resistance improver into the mixture.

Based on the above idea, eight kinds of fireproof coating materials prepared by mixing various inorganic materials were prepared, and the results of heating experiments on these were shown in Table 1. Table 2 shows the constitutional table of various inorganic materials in these refractory coating materials. Here, the mixing ratio (weight ratio) of various materials is as shown below.

a) Low temperature conductivity inorganic material ...... 0% to 20% b) High endothermic inorganic material ...... 0% to 35% c) Expandable inorganic material ...... 0% to 15% d) Heat resistance improving material ...... 0 % To 10% e) High temperature binder ... 10% to 45% f) Normal temperature / high temperature binder (silicone) ... 0% to 70% From the results of the heating experiment, it is considered that the temperature of the refractory coating material 6 does not exceed 350 ° C at the maximum and that the flaking is as small as possible. It is considered that the test body excluding N0.1 and NO.7 among the test bodies is suitable as the fireproof coating material 6.

Therefore, by dispersing a mixture of various inorganic materials shown in Table 2 above in a binder such as silicone, a flexible sheet-like fireproof coating material having a predetermined effect as a fireproof coating material is formed. Will be possible.

The refractory coating on the pillar 1, which is an embodiment of the first invention of the present invention, is performed by using the inorganic coating material 6 and the refractory coating material 6 whose mixing ratio is determined in consideration of the above results. The construction method will be described.

First, before the steel frames such as the pillars 1, 1, ..., Beams 2, 2, ... are erected, the diaphragm 4 is attached to the pillar 1, and the flexible sheet is formed around the pillar 1 at the factory. The fireproof coating material 6 which is applied and has an adhesive applied to the contact surface with the pillar 1 is spirally wound without a gap and is attached over its entire length. At this time, in order to facilitate the winding of the fire-resistant coating material 6 around the pillar 1, the both ends of the fire-resistant coating material 6 are obliquely cut as shown in FIG. After this, the pillars 1, 1, ... And the beams 2,2, ... are erected, so that a building structure of a steel frame structure is constructed.

By the above method, the fireproof coating method is applied to the pillar 1. Here, since the fireproof coating material 6 is formed in a sheet shape having flexibility, it can contribute to improving working conditions without generating dust during construction. Further, the fireproof coating construction method, since the fireproof coating is formed by winding a flexible sheet-shaped fireproof coating material around the steel frame, it is possible to pre-construct before the steel frame is erected, and thus the construction period It is possible to shorten it. Furthermore, since the fire-resistant coating material 6 is formed into a flexible sheet, it can be easily wound around a steel frame, and unlike the conventional fire-resistant coating material, it can be produced in a factory. The quality and thickness can be constantly controlled and stabilized. Since this fireproof coating material 6 effectively mixes various inorganic materials corresponding to the effect required for the fireproof coating material, its required thickness is made smaller than that of the conventional fireproof coating material. It is possible. Therefore, there is no risk of worsening working conditions, the construction period can be shortened, the quality and thickness of the fireproof coating can be stabilized, and the required thickness of the fireproof coating can be reduced. It is possible to realize a fireproof coating method that can be performed and a fireproof coating material for construction used in the method.

The various materials to be mixed with the fire-resistant coating material according to the second aspect of the present invention are not limited to the above-mentioned examples, and any inorganic material can be applied as long as its effect is sufficiently exhibited.
Further, the construction of the fireproof coating is not limited to before the steel frame is erected. For example, it is possible to construct the fireproof coating by winding the fireproof coating around a pillar in a factory producing the fireproof coating. Furthermore, the fireproof coating method according to the present invention is not limited to the construction on the pillar shown in the above embodiment, but can be applied to a beam. The steel frame on which the fireproof coating is applied is not limited to the steel pipe shown in the above embodiment, but can be applied to a box steel frame and other steel frames.

[Advantages of the Invention] As described in detail above, according to the first aspect of the present invention, a flexible long sheet-shaped fireproof coating material is spirally wound around a steel frame without a gap. Since the entire surface of the steel frame is covered with the fire-resistant coating material by applying the fire-resistant coating material, the fire-resistant coating material is formed by winding the flexible sheet-shaped fire-resistant coating material. In addition to being able to form a fireproof coating on long columns and beams extremely efficiently, it does not generate dust during the construction of the fireproof coating, which contributes to the improvement of working conditions and the steel frame In addition, the fireproof coating can be pre-applied, and thus the construction period can be shortened.

According to the second invention, a low-temperature-conductivity inorganic material such as rock wool, a highly endothermic inorganic material such as borax, an expansive inorganic material such as graphite, and calcium carbonate are contained in a binder such as silicone as a base material. Since at least one kind of inorganic material having improved heat resistance is dispersed and formed into a long sheet having a flexible single-layer structure, the flexibility and sheet shape of the fire-resistant coating material can be improved. Since it is possible to use the shape to facilitate the winding of the building structure around the steel frame and to produce the sheet-like fireproof coating material at the factory, the quality and thickness of the material should be controlled to be constant. Can be stabilized. In addition, since various inorganic materials corresponding to the effect required for the fire-resistant coating material are effectively mixed in the fire-resistant coating material, the required thickness thereof is reduced as compared with the conventional fire-resistant coating material. It is possible to

Therefore, according to these inventions, it is possible to shorten the construction period without fear of deteriorating the working conditions.
Further, it is possible to realize a fireproof coating method capable of stabilizing the quality and thickness of the fireproof coating material and reducing the required thickness of the fireproof coating material, and a fireproof coating material for construction used in the method. It is possible and particularly suitable for use when carrying out the above-mentioned first invention method.

[Brief description of drawings]

FIG. 1 is a front view showing a building structure having a steel frame structure to which a fire-resistant coating method for steel frames according to an embodiment of the present invention is applied;
The figure is the same plan view, FIG. 3 is a perspective view in which only the joints of columns and beams of the same building structure are taken out, and FIG. 4 is a plan view showing the fireproof coating material used in the same construction method. 1 ... Pillar (steel frame), 6 ... Fireproof coating material.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location C04B 14:30 14:36 14:38) (72) Inventor Yoshiharu Watanabe 2 Kyobashi, Chuo-ku, Tokyo No. 16-1 Shimizu Construction Co., Ltd. (56) Reference Japanese Patent Laid-Open No. 59-26987 (JP, A) Actually developed 56-144892 (JP, U)

Claims (2)

[Claims] 1. A flexible long sheet-shaped fireproof coating material is spirally wound around a steel frame with no gaps and applied to cover the entire surface of the steel frame. Fireproof coating method. 2. A low-temperature-conductivity inorganic material such as rock wool, a highly endothermic inorganic material such as borax, an expansive inorganic material such as graphite, and a heat resistance-improving inorganic material such as calcium carbonate in a binder such as silicone as a base material. At least one kind of inorganic material among the materials is dispersed and formed into a long sheet having a flexible single-layer structure, which is a fireproof coating material for construction.