JPS611754A - Formation of refractory coating layer in iron skeletal beam - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for forming a fire-resistant coating layer that covers the outer peripheral surface of a sweat-shaped steel beam in a framework that constitutes a building.

(Problems to be Solved by the Invention) Conventionally, in order to make this type of H-shaped steel beam a fireproof structure by coating it, generally, spraying, rock wool, rock wool mortar, etc. were used as a fireproof coating material, and the coating was made by spraying. A method of covering steel beams has been implemented. This method is a simple method, but the fireproof coating material is applied to the lower flange of the H-shaped steel beam to a thickness of 25 mm to 25 mm.
It is very difficult to adhere up to 601 m and the workability is poor.

That is, it is difficult to attach the fireproof coating material to the lower flange of the H-shaped steel beam with uniform thickness and density, and there are also problems such as scattering loss of the fireproof coating material and a poor working environment.

In addition, molded plates are made in advance by Fireproof Covering Materials Co., Ltd.
A method of covering the molded plate by attaching it to a steel beam using adhesive, nails, etc. has also been implemented. Although this method does not have the disadvantages of the spraying method, it requires some effort to cut and attach the fireproof plates in the details of the steel frame.

This invention was made in view of the above circumstances, and its purpose is to obtain a coating layer of uniform thickness by combining the method of spraying fireproof coating material on H-shaped steel beams and the method of attaching formed plates, and to The purpose of this invention is to propose a method that minimizes the scattering loss of coating materials, improves the poor working environment, and has excellent workability.

(Structure of the invention and its embodiments) The gist of the invention is as described in the claims section, and includes a method for sheathing the outer peripheral surface of an H-shaped steel beam to form a fireproof coating layer. , a fire-resistant coating layer is formed on the lower flange of the H-shaped steel beam by fitting a molded body made of fire-resistant coating material with a substantially U-shaped cross section, and a fire-resistant coating layer is formed on the remaining H-shaped steel beams. The coating layer is formed by spraying.

The present invention will be described in detail below based on the drawings. The method of the present invention relates to a method of forming a fireproof coating layer by covering the outer peripheral surface of the H-shaped steel beam 2 located below the floor 1 in FIG. It is something.

A molded body 3 made of a fireproof covering material and having a substantially U-shaped cross section is formed in advance, and is used to cover the inverted T-shaped cross section of the lower flange 4 of the H-shaped steel beam 2, that is, the lower surface, upper surface of the lower flange, and the steel frame. The molded bodies 3, 3 are fitted into the portion corresponding to the lower part of the web of the beam, and the abutting portion of the molded bodies 3.3 is filled with a fire-resistant joint sealing material 5 to fill the gap. As a result, a fireproof coating layer is formed on the lower flange by the formed body of the fireproof coating material. Note that if a fire-resistant adhesive is applied to the lower flange in advance and the molded body is fitted into the lower flange, the molded body will be prevented from falling off. Next, except for the part on which the fireproof coating layer was formed on the lower flange part, a fireproof coating material is sprayed to a predetermined thickness on the web part and the upper flange of the H-shaped steel beam 2 using a normal spraying method. Then, a covering layer 6 is formed.

A fireproof coating layer is formed on the H-shaped steel beam by the method of attaching and spraying the molded body as described above to form a fireproof structure.

The fire-resistant covering material used in this invention uses ordinary materials, such as heat-resistant materials such as rock wool, vermiculite, perlite, and asbestos, and a combination of these materials with a binder such as cement and gypsum. It is also a calcium silicate material made from silicate raw materials, calcareous raw materials, and inorganic fibers.

The molded plate 3 is made of the above-mentioned fireproof covering material, and has a substantially U-shaped cross section, a length of 600 to 1000 mm, and a thickness of 600 to 1000 mm so as to fit into the lower flange of the H-shaped steel beam within the frame. 25~
It is appropriately molded into the shape of 60 pieces. This molded body is prepared in advance by =
It can be molded into a predetermined size and shape and assembled at a predetermined location, or it can be cut into a predetermined size and shape on-site as needed. .

Inside the molded body 3, there is a reinforcing material 7 such as wire mesh, glazing, iron wire, etc.
By embedding, the molded body is strengthened and
It can prevent falling off when fitted into the lower flange.

The joint sealing material 5 plays the role of adhesion between molded bodies and steel frames and filling and sealing of gaps. For example, the joint sealing material 5 is made of a water glass adhesive such as sodium silicate or a foaming agent such as sodium silicate. Use a room-temperature foaming adhesive mixed with a curing agent, gelling agent, etc.

FIG. 2 shows an example in which the above-mentioned room temperature foaming adhesive is used as the joint sealing material 5. When the room temperature foaming adhesive is filled into the abutting portions of the molded bodies 3, a foaming phenomenon occurs, and the image molded body While sealing the gap, a portion is exposed on the lower surface 8 of the lower flange 4 of the steel beam and the surface 9 of the molded body and hardened. As a result, an anchoring effect can be expected. This adhesive prevents the molded body from falling off the lower flange, and
A strong fireproof coating layer with no openings can be obtained. Alternatively, this adhesive may be filled into the gap between the web lower part 10 of the H-shaped steel frame and the molded body 3.

3 and 4 show other embodiments of the present invention, in which the floor 1 and the ALC are shown.

An H-shaped steel beam 2 is placed at the corner of a wall 11 such as a PC board, and in order to form a fireproof coating layer on this H-shaped steel beam 2, it is necessary to form a substantially U-shaped cross section in which one piece is longer than the other. A molded body 3 made of a fireproof covering material is previously formed, and this is fitted into the lower flange 4 of the H-shaped steel beam to cover it.

In this case, use a fire-resistant joint sealant or adhesive to fix it. Next, fireproof coating material is applied to each surface of the web portion and upper flange of the H-shaped steel beam 2 to a predetermined thickness by spraying to form a spray coating layer 6.

In Fig. 4, a floor slab 1, an H-shaped steel beam 2, and a wall 12 are arranged in this order.In order to form a fireproof coating layer on this H-shaped steel beam 2, it is necessary to The U-shaped body 3 is cut out in advance by the thickness of the wall body 12, and this is fitted into the lower flange 4 of the H-shaped steel beam 2 to cover it. In this case, use a fire-resistant joint sealant or adhesive to fix it. Next, a fireproof coating is applied to the web portion and the upper flange of the H-shaped steel beam 2 to a predetermined thickness by a spraying method to form a spray coating layer 6.

(Effects of the Invention) This invention has the above-described configuration, and a fire-resistant structure is achieved by forming a fire-resistant coating layer by spraying a fire-resistant coating material on an H-shaped steel beam and attaching a pre-formed plate. As a result, the fireproof coating layer can be made to have a uniform thickness, and the workability is extremely good, shortening the construction period and producing high quality fireproof Nr.
fi is obtained. Furthermore, the predetermined spraying of the fireproof covering material in the conventional spraying method has great effects, such as eliminating staining of other parts due to scattering, improving scattering losses, improving the working environment, and reducing the amount of cleaning work on the floor.

[Brief explanation of the drawing]

FIG. 1 is a sectional view explaining the invention in detail, FIG. 2 is an enlarged sectional view of the lower flange of the H-shaped steel beam shown in FIG. 1,
FIGS. 3 and 4 are cross-sectional views illustrating other embodiments of the present invention. 1...Floor, 2...H-shaped steel beam, 3.
...Molded body, 4...Lower flange, 5.
...Sealing material, 6...Ti target, rffI
, 7... Reinforcement material, 12... Wall body.

Claims (1)

[Claims] When forming a fireproof coating layer by sheathing the outer peripheral surface of the H-shaped steel beam, first, a molded body having a substantially U-shaped cross section made of fireproof coating material is fitted into the lower flange of the H-shaped steel beam. 1. A method for forming a fireproof coating layer on a steel beam, the method comprising forming a fireproof coating layer, and forming the coating layer on the remaining H-shaped steel beam by spraying a fireproof coating material.