JPH11276982A - Electrostatic spraying for fireproof covering - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cover a steel frame with a fireproof covering material so as to form a fireproof covering with uniform thickness, while reducing loss of the covering material by electrostatically charging the fireproof covering material with a high voltage generator and spraying the charged fireproof covering material on the structural steel frame with a spray gun. SOLUTION: This method for performing the electrostatic spraying of a fireproof covering material on a steel frame used in a steel structured building comprises: applying a negative high voltage supplied from a high voltage generator 2 to a spray gun 10 while providing the steel frame, e.g. an H-steel 13 with positive polarity; thereafter, supplying a powdery fireproof covering material in a tank 12 to the spray gun 10 through a supply pipe 14 by using a compressor 11 to negatively charge the powdery fireproof covering material; and then, spraying the charged powdery fireproof covering material from a spray nozzle of the spray gun 10 toward the surface to be covered of the H-steel 13. Thus, the charged powdery fireproof covering material is efficiently attracted toward the H-steel 13 by the positive charge of the H-steel 13 to deposit the powdery fireproof covering material on the surface of the H-steel 13 without scattering the powdery covering material and to form a fireproof covering with a uniform thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a building, for example,
The present invention relates to a method for coating a steel frame used for columns and beams in a steel structure with a paint as a fire-resistant coating material.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 2, a spray gun 10, a compressor 11, and, for example, a powder refractory coating material are stored in a steel frame made of steel, for example, H-type steel. The spraying device 15 composed of a tank 12 and a supply pipe 14 connecting the spray gun 10 with the compressor 11 and the tank 12 is used to spray the H to be coated.
Spray gun 10 with fireproof coating material of tank 12
There is known a method of spraying from the surface and coating.

[0003]

However, when the refractory coating material is sprayed from the spray gun 10 toward the H-shaped steel 13 by the compressor 11, the refractory coating material diffuses from the nozzle of the spray gun 10 and adheres to the H-shaped steel 13. However, there is a problem that the refractory coating material, which is a paint, adheres to the surroundings, which takes time and effort to clean up, and that it is difficult to make the coating thickness uniform.

[0004] Therefore, the conventional refractory coating method for steel frames in steel structures has problems to be solved in eliminating waste of the refractory coating material and making the coating thickness uniform.

[0005]

The gist of the present invention for solving the above-mentioned problems of the refractory coating electrostatic spraying method according to the present invention is to charge the refractory coating with a high voltage generator, and to charge the charged refractory coating. Is sprayed onto a steel frame by a spray gun, and the steel frame is coated with the fire-resistant coating material having a uniform thickness.

According to the refractory coating electrostatic spraying method according to the present invention, the refractory coating material sprayed from the spray gun is charged and attracted to the steel frame to be coated, so that it is not wasted. It is. In addition, the adhesion of the refractory coating material is large and the coating thickness is uniform.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a refractory coating electrostatic spraying method according to the present invention will be described with reference to the drawings. Note that, for easy understanding of the present invention, portions corresponding to the conventional example are denoted by the same reference numerals as in the conventional example. FIG. 1 is an explanatory diagram of an embodiment of the present invention.

The structure of the refractory-coated electrostatic spraying device 1 includes a high-voltage generator 2, a spray gun 10 connected to the high-voltage generator 2 via a conducting wire 3, and a spray gun 10
, And a compressor 11 and a tank 12 connected to each other via a supply pipe 14. The H-shaped steel 13, which is a steel frame to be coated, is electrically connected to the high-voltage generator 2 via a conductive wire 4.

The tank 12 stores the powder refractory coating material. The powder refractory coating material is supplied to the spray gun through a supply pipe 14 and is also “positive” by the high voltage generator 2. Or it is charged “negative”. In addition, it is preferable that the powder refractory coating material is charged "negative" from the viewpoint of good surface finish and uniform film thickness.

In order to electrostatically spray a steel frame in a steel-framed building using such a fireproof coating electrostatic spraying device 1, for example, a high negative voltage is applied to the spray gun 10 by a high voltage generating device 2. On the other hand, the H-shaped steel 13 is made positive.

Then, the compressor 12 controls the tank 12.
To supply the powder refractory coating material to the spray gun 10 through the supply pipe 14 to charge the powder refractory coating material to a negative polarity,
The charged powdered refractory coating material is sprayed from a nozzle of the spray gun 10 toward a coating surface of the H-shaped steel 13.

The charged powder refractory coating material is H-shaped steel 13
And the powder refractory coating material adheres to the surface of the H-shaped steel 13 without being scattered, thereby forming a refractory coating film.

As a second embodiment of the present invention, the refractory coating material is not a powder coating but a liquid coating, which is atomized by an atomizing device connected to a spray gun 10 and the atomized liquid is formed. The paint is charged by the high voltage generator 2 to coat the H-shaped steel 13.

Further, as a third embodiment of the present invention, a high positive voltage is applied to the spray gun 10 to make the H-shaped steel 13 negative and to coat a refractory coating material. Further, by changing the positive / negative polarity of the spray gun 10 and the H-shaped steel 13 alternately, the H-shaped steel 13 can be coated with a thick coating.

[0015] In this way, the steel frame used for the steel-framed building is coated with the fire-resistant coating material with a reduced loss of the fire-resistant coating material and a uniform coating thickness.

[0016]

As described above, in the refractory coating electrostatic spraying method according to the present invention, the refractory coating material is charged by a high voltage generator, and the charged refractory coating material is sprayed onto a steel frame by a spray gun. However, since the steel frame is fire-resistant coated with a fire-resistant coating material having a uniform coating thickness, it is possible to coat the steel frame used for steel-frame construction with a reduced loss of the fire-resistant coating material and, moreover, a uniform coating thickness. It has an excellent effect of being able to do so. Further, the present invention has an excellent effect that scattering of the refractory coating material is prevented and cleaning is easy.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an embodiment of a refractory coating electrostatic spraying method according to the present invention.

FIG. 2 is an explanatory view of an embodiment of a fireproof coating spraying method according to a conventional example.

[Explanation of symbols]

1 Fireproof coating electrostatic spraying device, 2 High voltage generator, 3
Conductive material, 4 conductive material, 10 spray gun, 11 compressor, 12 tank, 13 H-shaped steel, 14 supply pipe.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Tohru Yoshida 1-11-15 Kitayuki, Nishi-ku, Yokohama-shi Toda Construction Co., Ltd.

Claims (1)

[Claims] 1. A refractory coating material is charged by a high voltage generator,
The sprayed charged fireproof material is sprayed onto a steel frame with a spray gun, and the steel frame is fireproofed with a fireproof material having a uniform thickness.