JP3179293B2 - Refractory coating structure of steel and refractory coating method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire-resistant coating structure and a fire-resistant coating method in which a steel material such as a steel pipe column is covered with a fire-resistant material in a steel structure building.

[0002]

2. Description of the Related Art In a steel structure building, a specialized craftsman applies a fire-resistant coating material to main structural parts such as columns and beams to make it a fire-resistant building. As a method of applying the coating material, there are a wet method and a dry method of attaching a fireproof plate, etc.The dry method is more advantageous in terms of improving the construction site environment and shortening the construction period, and this method is advantageous. Tend to increase.
As a fireproof covering material in this case, gypsum board is advantageous in terms of handleability and workability, but gypsum board becomes very brittle because the water of crystallization as a binder is dehydrated by heating in the event of a fire. This causes inconvenience of falling off and impairing fire resistance. As a method of preventing such a gypsum board from falling off, a method of increasing the thickness of the gypsum board, a method of using a special gypsum board reinforced with fiber, using a lot of screws and adhesives or winding a number of wires or the like There is a method to prevent falling as much as possible even if cracked, as a method to increase the fire resistance of the steel column, a method to fill the inside of the steel column with concrete to increase the overall heat capacity and prevent the temperature of the steel material itself from rising, And so on.

For example, FIG. 3 shows a conventional example in which a square steel pipe column is provided with a fire-resistant coating with a gypsum board as a fire-resistant material, and four sub-plaster gypsum boards (2) are arranged on the four circumferences of the steel pipe column (1). ,
L-shaped iron plates (3) (3) are applied to each corner so as to straddle the end of each gypsum board (2) (2).
A wire (5) is wound from the outside and tightened, thereby holding the gypsum board (2) (2). Further, on the outside thereof, gypsum boards (4) (4) ... reinforced with fibers are arranged around four sides, and screws (6) (6) ... are screwed in so as to reach the contact plate (3) from outside. , And the lower gypsum board (2) and the upper gypsum board (4) are interconnected by a number of staples (7) (7). Furthermore, the inside of the steel pipe column (1) is filled with concrete (8) having a large heat capacity.

[0004]

The conventional example shown in FIG. 3 is as follows.
Most of the above-mentioned fall prevention measures have been applied.
By driving many staples (7) in addition to (6),
Although the gypsum boards (2) and (4) are prevented from falling off even if they break, there is a disadvantage that the construction work becomes more troublesome and requires a long working time. Further, since the underlying gypsum board (2) is only held at the corners by the L-shaped contact plate (3) and the wire (5), the outer gypsum board (4)
When the wire is dropped, the wire is easily dropped, and when the number of wires (5) is increased, the work becomes more troublesome. Moreover, the work of tightening the wire (5) itself is troublesome.

The gypsum board (4) is expensive because it is a special gypsum board. In this case, even if the thickness of each of the gypsum boards (2) and (4) is increased, the cost increases, and in this case, the external shape of the entire pillar becomes large, and there is a disadvantage that the indoor area is reduced accordingly. Furthermore, steel pipe columns (1)
Filling the inside with concrete (8) has the disadvantage that the steel tube column (1) itself becomes very heavy and the cost for filling is very high.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and in a fire-resistant coating of a dry construction method in which a steel material such as a pillar is coated with a fire-resistant coating material such as a gypsum board, it is possible to prevent the fire-resistant coating material from falling off due to heat. The object of the present invention is to make it possible to perform the work easily and at low cost.

[0007]

In order to solve the above-mentioned problems, a refractory coating structure according to the present invention is provided for covering the surface of a steel material with a refractory coating material, wherein the refractory coating material covers the entire circumference of the steel material. It consists of a coating material and an upper coating material covering the surface side of the lower coating material, and between the lower coating material and the upper coating material, a plurality of iron plate materials overlap the ends of the iron plate materials with each other. In this state, the covering material and the iron plate material are integrated by screws screwed from the outside of the upper covering material through the overlapping portion of the iron plate material to the lower covering material in such a state as to cover the entire circumference of the lower covering material. Characterized by being combined with

[0008] In the above, it is conceivable that the refractory coating material is gypsum board and that a square steel pipe is used as the steel material. In other words, the purpose of preventing falling off is particularly effective for gypsum boards, but is not necessarily limited to gypsum boards. Also, a special gypsum board reinforced with fibers or the like may be used for the outer covering material.

Further, in order to achieve the same object, the method for refractory coating of the present invention comprises the steps of: providing a subbing covering material so as to cover the entire surface of a steel material to be refractory-coated; A plurality of iron plate materials are installed so as to cover the entire surface of the underlining covering material while overlapping the ends of the iron plate materials, and temporarily hold each iron plate material, and then,
An outer covering material is provided outside the outer covering material, and screws are screwed in from the outside of the upper covering material so as to pass through the overlapping portion of the iron plate materials.

[0010]

According to the present invention, since the undercoating material is covered with the iron plate over the entire surface, even if the coating material may be cracked by the heat of the fire, at least the undercoating material may be used. The material can be prevented from falling off. Also, screws that screw from the outside of the covering material fix not only the covering material but also the iron plate materials,
At the stage of the construction work, the iron plate material need only be temporarily temporarily held, and the formal fixation only needs to be performed at the last stage, so that the workability is very good.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiments, the present invention is applied to a fireproof coating of a square steel tubular column, and will be described below in the order of construction.

In FIGS. 1 and 2, reference numeral 11 denotes a square steel pipe column. First, four sub-plaster gypsum boards (12) are brought into contact with the outer surfaces of the square steel pipe column (11) in four directions. (12)…
Is set up, and paper tape for temporary fixation is applied around its four circumferences so that these submerged plasterboards (12) (12)…
(13) and the like are temporarily adhered and fixedly held.

(14), (14)... Are four thin zinc-iron plates formed by bending both ends in the left-right direction into a substantially U-shaped cross section as shown in FIG. Zinc iron plate
(14) (14)…, respectively, each of the above-mentioned subsurface plasterboards (12) (12)…
Cover the outer surface of the That is, first, two galvanized iron plates (14) and (14) are formed from the outside in a U-shaped groove portion so as to cover the outer surfaces of a pair of sub-plastered gypsum boards (12) (12). And then attached to the outside of a pair of sub-plastered gypsum boards (12) and (12) in a direction perpendicular to it, in the same manner so that galvanized sheets (14) and (14) are fitted from the outside. , The underlying gypsum boards (12), (12)... At this time, the zinc iron plate adjacent to each other
(14) The bent end portion (15) of (14) and the main body portion (16) are overlapped with each other on both sides of the corner portion.
In this manner, with the zinc iron plates (14) (14)... Installed, the temporary fixing paper tape (17) and the like are adhered to the iron plates (14) (14). Temporarily hold it so that it does not fall.

After the galvanized iron plates (14) (14) are attached as described above, the outer surfaces of the galvanized iron plates (14) (14) are covered so as to correspond to the respective outer surfaces. , Four gypsum plasterboards (18), (18)... Are attached, and these gypsum plasterboards (18) (18). Screw it in and fix it.
At this time, the ends of the screws (19) are screwed so as to pass through the overlapped portions of the bent ends (15) and the main body (16) of the galvanized iron plate (14), and the ends of the screws are further placed on a gypsum board. (12), whereby the gypsum board (18), the galvanized iron plate (14) and the gypsum board (12) are simultaneously joined together. At the same time, the galvanized iron plate (14) (1
4) ... are integrated with each other by this screw (19),
A fire-resistant coating structure in which each member is completely integrated is obtained.

In the above, in this embodiment, a zinc iron plate is used.
(14) is formed in a U-shape, and is arranged to be fitted on the side surface in each of the four directions, but is not limited to such a thing,
It may be L-shaped or other shapes that cover the side surfaces in two directions.

[0016]

As described above, according to the present invention, since the surface of the underlining covering material is covered over the entire circumference by the iron plate material, the covering material is dehydrated by heat in a fire. In this case, at least, the undercoating material does not fall off, and the effect of suppressing an increase in the temperature of the internal steel material can be obtained. Therefore, it is not necessary to use a large number of screws, staples, wires, or the like to fix in many places, and screwing work can be performed much easier, and workability is greatly improved.

In addition, this screwing is only required to be screwed in the last stage of installing the upper covering material so as to penetrate the overlapped portion of the iron plate material. However, as shown in the figure, it is only necessary to temporarily hold it with a tape or the like, and the workability is further improved. in addition,
The screws enable the lower covering material, the upper covering material and the iron plate material to be surely integrated with each other to increase the support strength, and the iron plate materials are also joined together, so that a stronger material can be obtained. Can be Further, since the iron plate material covers the entire circumference, the anti-impact property is excellent.

Of course, since the fire resistance is good, there is no need to fill concrete or the like into the inside of the steel pipe column, or it is not necessary to use a gypsum board or a special gypsum board having a large thickness, so that it can be implemented at low cost. The effect is obtained. Conversely, if a special gypsum board or the like having a high strength is used, the advantage that the thickness can be reduced can be obtained.

[Brief description of the drawings]

FIG. 1 is a cutaway perspective view of a main part of a fire-resistant coating structure of a steel pipe column showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the fire-resistant coating structure of the present invention.

FIG. 3 is a cutaway perspective view of a main part showing a conventional fireproof covering structure.

[Explanation of symbols]

 (11) Rectangular steel tubular column (12) Plastered gypsum board (13) Temporary fixing tape (14) Galvanized iron plate (17) Temporary fixing tape (18) Upper plasterboard (19) Screw

──────────────────────────────────────────────────続 き Continuation of the front page (72) Naoya Nakatsuka 1-1-88 Oyodonaka, Kita-ku, Osaka Sekisui House Co., Ltd. (56) References JP-A-8-68130 (JP, A) 7-42270 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04B 1/94 E04C 3/32 B32B 13/06

Claims (4)

(57) [Claims] Claims: 1. A steel material having a surface coated with a refractory coating material, wherein the refractory coating material comprises an undercoat material covering the entire periphery of the steel material and an overcoat material covering the surface side of the undercoat material. A plurality of iron plate members are arranged between the undercoat material and the overcoat material so as to cover the entire circumference of the undercoat material with the ends of the iron plate materials overlapped with each other. A fire-resistant coating structure for a steel material, wherein the coating material and the iron plate material are integrally joined by screws screwed from the outside of the material to the undercoating material through the overlapping portion of the iron plate material. 2. The fire-resistant coating structure according to claim 1, wherein said fire-resistant coating material is a gypsum board. 3. The fire-resistant coating structure according to claim 1, wherein the steel material is a square steel pipe. 4. An underlining covering material is installed so as to cover the entire surface of the steel material to be fire-resistant coated and temporarily held together, and then a plurality of iron plate materials are overlapped with the end portions of the iron plate materials. While covering the entire surface of the undercoating material, temporarily holding each iron plate, and then installing the overcoating material outside, and from the outside of the overcoating material. A method for refractory coating steel, comprising screwing and fixing a screw so as to pass through an overlapping portion between the iron plate materials.