JP2013241796A - Fire-resistive covering structure of iron frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire-resistive covering structure of an iron frame, which has superior fire-resistance and beauty in an iron frame member having an uneven part.SOLUTION: The fire-resistive covering structure of an iron frame member 1 having an uneven part 2 obtains superior beauty by covering the whole of the iron frame member 1 having the uneven part 2 with a foamable fireproof sheet 3. Specifically, in the iron frame member 1 having the uneven part 2, a gap between the uneven part 2 and the foamable fireproof sheet 3 is filled with a foamable fireproof putty material 4, and thereby the iron frame member 1 can be uniformly covered with the foamable fireproof sheet 3. Moreover, a uniform fire-resistive heat insulating layer is formed by an effect of the foamable fireproof sheet 3 and the foamable fireproof putty material 4 in a high temperature condition such as a fire.

Description

The present invention relates to a novel steel fireproof covering structure.

  When a structure such as a building or a civil engineering structure is exposed to a high temperature due to a fire or the like, there is a problem that the physical strength of the steel member constituting the structure is rapidly reduced. On the other hand, there is known a fireproof coating structure in which a steel member is covered with a fireproof coating material, and the temperature rise of the steel member during a fire is delayed to suppress a decrease in physical strength of the steel member.

Moreover, there exists a structure which employ | adopted the steel member which has uneven parts, such as a junction part, as a steel member. As a fireproof covering structure for such a structure, Patent Document 1 describes a method in which a protruding portion is locally covered with a heat shield on a steel member joined with a plurality of bolts. According to the method of Patent Document 1, it is possible to shield a thermally shielded part from thermal radiation.

Japanese Patent No. 3954882

However, when the protruding part is locally covered as in Patent Document 1, the shape of the protruding part remains as it is, which may be inferior in aesthetics. Moreover, there is a possibility that fire resistance may be insufficient only by covering locally.

An object of the present invention is to provide a steel frame fireproof coating structure that is excellent in fire resistance and aesthetics in a steel member having an uneven portion.

As a result of intensive studies to achieve the above object, the present inventor has conceived a specific fireproof coating structure for a steel member having an uneven portion, and completed the present invention.

  That is, the steel fireproof covering structure of the present invention has the following characteristics.

1. It is a steel fireproof coating structure in which a foamable fireproof sheet is laminated on a steel member,
The steel member has an uneven portion,
A steel fireproof covering structure characterized in that a gap between the uneven portion and the foamable fireproof sheet is filled with a foamable fireproof putty material.
2. The foamable fireproof sheet is provided via an adhesive. Steel fireproof covering structure as described in 1.

Above 1. In the invention which concerns, since the whole uneven | corrugated | grooved part of a steel frame member is coat | covered with a foamable fireproof sheet, it is excellent in aesthetics. Moreover, a foamable fireproof sheet can be uniformly coat | covered by the foaming fireproof putty material being satisfy | filled in the clearance gap between the uneven | corrugated | grooved part of a steel frame member, and a foamable fireproof sheet. Furthermore, at the time of high temperature such as a fire, a uniform carbonized heat insulating layer can be formed due to the effects of the foamable fireproof sheet and the foamable fireproof putty material, so that excellent fireproof performance can be exhibited.

2. In the invention which concerns on, the foamable fireproof sheet is laminated | stacked on the steel frame member through the adhesive material. Thereby, adhesiveness with a steel frame member and a foaming fire-resistant putty increases, and it can exhibit the further outstanding fire-resistant performance.

It is a figure which shows an example of this invention steel frame fireproof coating structure. It is an enlarged view of FIG. 1-A part. It is a figure which shows another example of this invention steel frame fireproof covering structure.

  Hereinafter, modes for carrying out the present invention will be described.

The present invention relates to a fireproof covering structure for a steel member having an uneven portion. Specifically, it is a steel fireproof coating structure in which a foamable fireproof sheet is laminated on a steel member having an uneven part, and in particular, in a steel member having an uneven part, foam is formed in the gap between the uneven part and the above foamable fireproof sheet. The refractory putty material is filled.

Examples of the steel frame member of the present invention include a square steel pipe, a round steel pipe, a square steel, a round steel, an H-shaped steel, and an I-shaped steel. In addition, the steel member can also use what carried out the antirust process.
Moreover, the uneven | corrugated | grooved part of the said steel member is a recessed part and / or convex part formed in the steel member surface. Examples of the concavo-convex portion include a portion in which a steel member such as a column and a column, a beam and a beam in a steel structure is joined using welding and / or bolts, and other non-smooth locations.
A welded joint is a part where steel members are joined together by welding, and has irregularities such as surplus and fillet. A bolt joint part is a part which has protrusions, such as various joining members and bolts, and has an uneven part. Other non-smooth locations include relatively small irregularities caused by surface treatment or the like.

FIG. 1 is a view showing an example of the steel fireproof covering structure of the present invention. In FIG. 1, a foamable refractory sheet 3 is provided for the steel member 1 having the concavo-convex portion 2, and the foamable refractory putty material 4 is filled in the gap between the concavo-convex portion 2 and the foamable refractory sheet 3. FIG. 2 is an enlarged view of portion A in FIG.

The foamable refractory sheet 3 of the present invention foams when the ambient temperature reaches a predetermined foaming temperature due to a fire or the like, and forms a carbonized heat insulating layer. As the foamable refractory sheet 3, one containing a resin component, a flame retardant, a foaming agent, a carbonizing agent and a filler as a constituent component is suitable. Among these, as the resin component, for example, a thermoplastic resin such as an acrylic resin, as a flame retardant, ammonium polyphosphate, etc., as a foaming agent, melamine, dicyandiamide, azodicarbonamide, etc., as a carbonizing agent, pentaerythritol, dipenta Examples of fillers such as erythritol include titanium dioxide, calcium carbonate, and inorganic fibers.

The blending ratio of each component is usually 200 to 600 parts by weight of a flame retardant, 40 to 150 parts by weight of a foaming agent, 40 to 150 parts by weight of a carbonizing agent, and a filler with respect to 100 parts by weight of the resin component in terms of solid content. It is preferable that it is 50-160 weight part.
The thickness of the foamable fireproof sheet 3 may be appropriately set depending on the application site and the like, but is usually about 0.5 to 5 mm, preferably about 1 to 4 mm.

Moreover, although the foamable fireproof sheet 3 of this invention may be comprised only from the sheet | seat containing the said component, it is preferable that the fibrous sheet is laminated | stacked on the back surface (steel member 1 side). Thereby, foaming by the side of the fibrous sheet of the foamable fireproof sheet 3 can be suppressed, and foaming can be performed only in one direction to form a carbonized heat insulating layer. Moreover, it is excellent in the fall-off prevention effect of the formed carbonized heat insulation layer.

Examples of such a fibrous sheet include a sheet containing organic fibers, inorganic fibers, and the like.
Examples of the organic fiber include pulp fiber, polyester fiber, polypropylene fiber, aramid fiber, vinylon fiber, polyethylene fiber, polyarylate fiber, PBO fiber, nylon fiber, acrylic fiber, vinyl chloride fiber, cellulose fiber, and their woven fabric. A cloth, a nonwoven fabric, etc. are mentioned. The organic fiber may be melted in a temperature range of about 150 ° C. to be in a liquid state, but is preferably not melted in such a temperature range.

Examples of the inorganic fiber include rock wool, glass fiber, silica fiber, silica-alumina fiber, carbon fiber, silicon carbide fiber, or the like, or woven fabric, nonwoven fabric, and the like, and fine metal wires such as iron and copper. Such an inorganic fiber does not melt even when heat is applied, and further acts as a reinforcing material, and can hold the foamed carbonized heat insulating layer. Therefore, the inorganic fiber is excellent in the effect of preventing the steel member 1 from falling off. In particular, if the inorganic fiber has a network structure, the foamable refractory sheet 3 and the carbonized heat insulating layer formed by applying heat thereto can be reinforced more efficiently, and the dropping from the steel member 1 is prevented. This is preferable.

The fibrous sheet is a composite sheet composed of inorganic fibers and organic fibers, wherein the inorganic fibers are arranged in a mesh pattern, and a woven or non-woven fabric of organic fibers is laminated on at least one side (one side), It is preferable that part or all of the network of inorganic fibers is closed with organic fibers. By combining the inorganic fiber and the organic fiber, the molten component due to heat is adsorbed, and peeling of the joint portion can be prevented. Moreover, if the mesh is closed with organic fibers, the network structure of the inorganic fibers is not easily broken during the production of the foamable refractory sheet 3 and can be easily manufactured.

The foamable refractory putty 4 of the present invention is filled with a gap formed when the foamable refractory sheet 3 is laminated on the steel member 1 having the concavo-convex portion 2. The foamable refractory putty 4 can relieve (relax) unevenness at the joint. As a result, the occurrence of kinks and wrinkles when the foamable fireproof sheet 3 is laminated can be suppressed, and the finish is excellent in aesthetics.
In addition, due to the effects of the foamable refractory sheet 3 and the foamable refractory putty 4 on the steel frame member 1, when exposed to a high temperature due to a fire or the like, even better fireproof performance can be exhibited.

The foamable refractory putty 4 of the present invention foams when the ambient temperature reaches a predetermined foaming temperature due to a fire or the like, and forms a carbonized heat insulating layer. As the foamable refractory putty 4, those containing the same components as the above-mentioned foamable refractory sheet 3 are suitable.

  The blending ratio of each component is preferably 200 to 600 parts by weight of a flame retardant, 40 to 150 parts by weight of a foaming agent, 40 to 150 parts by weight of a carbonizing agent, and filled with respect to 100 parts by weight of a resin component in terms of solid content. 50 to 160 parts by weight of the agent. The foamable refractory putty 4 of the present invention is a composition containing the above-described constituent components, and its solid content and viscosity may be set as appropriate, but the viscosity is preferably about 50 Pa · s or more. By setting it as such a range, the space | gap of an uneven | corrugated | grooved part and a foamable fireproof sheet 3 can fully be satisfy | filled, and the unevenness | corrugation of a junction part can be eased. Moreover, it has excellent polishing properties, and irregularities can be arbitrarily adjusted.

Another example of the steel fireproof covering structure of the present invention is shown in FIG.
In FIG. 3, a foamable refractory sheet 3 is provided on the steel member 1 having the concavo-convex portion 2 via an adhesive 5, and a foamable refractory putty material 4 is provided in the gap between the concavo-convex portion 2 and the foamable refractory sheet 3. Is filled.

As the adhesive material 5 in the present invention, for example, water-dispersed, water-soluble, and solvent-types mainly composed of acrylic resin, silicon resin, epoxy resin, vinyl resin, phenol resin, polyester resin, urethane resin, paraffin, etc. A well-known thing, such as an adhesive agent, can be used. A flame retardant, a foaming agent, a carbonizing agent, a filler, etc. which are mix | blended with the foamable fireproof sheet 3 mentioned above can also be added to the adhesive agent 5 as needed. In the present invention, the adhesive includes a pressure-sensitive adhesive.

When the foamable refractory sheet 3 is provided on the steel member 1 via the adhesive 5, the foamable refractory sheet 3 can be laminated on the steel member 1 without a gap. As a result, the occurrence of defects such as swelling, floating and peeling of the foamable fireproof sheet 3 can be suppressed.

The steel frame fireproof covering structure of the present invention can be formed, for example, by the following method.
(1) The step of applying a foamable refractory putty material to the concavo-convex portion of the steel member and relaxing the concavo-convex shape (2) The step of laminating the foamable refractory sheet on the steel member of the above (1) After the above (1), the foamable refractory putty material may be polished if necessary.

Moreover, when providing the foamable fireproof sheet 3 via the adhesive material 5, in the above (2), the method of using what applied the adhesive material 5 to the back surface side of the foamable fireproof sheet 3 previously, or the above What is necessary is just to perform by the method etc. which apply the adhesive material 5 between the process of (1) and said (2).

  Examples are given below to clarify the features of the present invention.

(Foaming fireproof putty)
Mix 100 parts by weight of acrylic resin, 90 parts by weight of melamine, 90 parts by weight of dipentaerythritol, 400 parts by weight of ammonium polyphosphate, 130 parts by weight of titanium oxide, add xylene and stir well so that each component becomes uniform, A foaming refractory putty was obtained.

(Foaming fireproof sheet)
A mixture containing 100 parts by weight of acrylic resin, 90 parts by weight of melamine, 90 parts by weight of dipentaerythritol, 320 parts by weight of ammonium polyphosphate and 100 parts by weight of titanium oxide is kneaded with a pressure kneader set at a temperature of 120 ° C. and foamed. After preparing a kneaded material for a fireproof fireproof sheet, the kneaded material was laminated on a glass nonwoven fabric and processed into a sheet by a rolling roller to prepare a foamable fireproof sheet (450 mm × 1200 mm) having a film thickness of 1.5 mm.

(Steel frame fireproof covering structure)
As a steel member having a welded joint, a square steel pipe (300 mm × 300 mm × 9 mm, height 500 mm) was joined by welding and a rust preventive primer was applied in advance as a base material. Note that the height of the welded portion is 2 mm.

Apply a foaming fire-resistant putty to the base material having the welded portion with a trowel, adjust the unevenness of the welded portion to reduce unevenness, and dry at a temperature of 20 ° C and a relative humidity of 65%. It was.
Next, an acrylic adhesive with a thickness of 50 μm was applied on the base material and the foamable refractory putty, the foamable refractory sheet was laminated, and dried at a temperature of 20 ° C. and a relative humidity of 65% for one week. did. The test body was excellent in aesthetics, in which the foamed refractory putty material was filled in the gap between the concavo-convex part and the foamable refractory sheet, and the concavo-convex part of the joint part was relaxed.

The prepared test specimen was subjected to a heating test for 1 hour in accordance with a standard heating curve of ISO834. As a result, a substantially uniform carbonized heat insulating layer was formed, and good fire resistance performance was exhibited.

1. 1. Steel frame member Uneven portion 3. 3. Expandable fireproof sheet 4. Expandable fireproof putty Adhesive

Claims (2)

It is a steel fireproof coating structure in which a foamable fireproof sheet is laminated on a steel member,
The steel member has an uneven portion,
A steel fireproof covering structure characterized in that a gap between the uneven portion and the foamable fireproof sheet is filled with a foamable fireproof putty material.   The steel fireproof coating structure according to claim 1, wherein the foamable fireproof sheet is provided via an adhesive.

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