JP2014105566A - Fireproof construction method for structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fireproof construction method for a structure, capable of easily forming a cured film of a fireproof paint on site on the surface of a painted metal material which constitutes the structure and to be painted on site.SOLUTION: A fireproof construction method for a structure, for forming a cured film of a fireproof paint on the surface of a painted metal material, includes: a sticking step for sticking a fireproof cured film obtained by curing a foam type fireproof paint in advance on an unformed part of a cured film, on which the cured film of the fireproof paint is not formed, via an undercoat layer before drying and curing; and a curing step for drying and curing the undercoat layer.

Description

  The present invention relates to a fireproofing method for a structure, and more specifically, a cured film of a fireproof paint can be easily formed on the surface of a base material forming the structure, and the base material for forming the structure A fireproofing method for a structure in which a cured film can be easily formed on a portion where a cured film is not present after a fireproof cured film is lost for some reason after a fireproof cured film has already been formed on the surface About.

  Since the steel frame constituting the structure is softened at about 350 ° C., the structure is collapsed as a result of the steel frame being softened by heat from the flame when a fire occurs. Therefore, according to the Building Standard Law, structures formed of steel frames such as high-rise buildings, gas brands, and oil refineries are required to have fire resistance.

  Conventionally, several methods have been adopted as methods for imparting fire resistance to structures. For example, coating the surface of the steel frame with mortar, gypsum, covering with asbestos, surrounding the steel with bricks, spraying rock wool on the surface of the steel, covering the surface of the steel with fire resistance Forming a fire-resistant coating film by applying a paint is known as a general fire-resistant technique.

In recent years, a fire resistance imparting technique attracting attention is to form a fire-resistant coating film on the surface of a base material such as a steel frame by applying a foam fire-resistant paint. The fire-resistant cured film made of foamable fire-resistant paint absorbs heat generated in the event of a fire and foams, so the film becomes thicker and exhibits a heat insulation effect, delaying the heating of base materials such as steel frames Let
Moreover, in order to obtain a fire-resistant cured film having sufficient fire resistance, it is necessary to apply a foamable fire-resistant paint so that the dry film thickness is several hundred μm to several mm.

  When applying a foam fireproof paint to a base material that forms a structure, a scaffold is assembled on the outer wall of a building, etc., the scaffold is fixed to the outer wall with a metal fitting, and an operator uses the scaffold to Apply foaming fireproof paint on the outer wall. After the painting work is finished, the scaffold is removed.

  When the scaffold is removed, a portion of the metal fitting fixed to the outer wall or the like that is in contact with the outer wall or the like appears as an unpainted portion of the foamable fireproof paint. If this unpainted part is left as it is, the heat of the fire is directly conducted in the event of a fire, thereby promoting the softening of the steel frame.

  Considering the above, it is necessary to apply a foaming fire-resistant paint to this unpainted portion, but when forming a fire-resistant coating film having a film thickness of several hundreds μm to several mm by on-site painting, multiple times. It is necessary to increase the thickness by recoating. Usually, the application of fire-resistant paint on site requires a painting period of several days to several weeks, and there is a problem that the working time is prolonged. In addition, since there are many scaffolding brackets assembled for the previous painting work on the painted wall, in consideration of the complexity of painting work on this unpainted part, the unpainted part can be painted with a simple operation. There is an urgent need for a method that can do this.

  By the way, the invention which concerns on patent document 1 is "the fireproof characterized by forming the outer periphery of this housing with the sheet-like fireproof coating layer in the housing which consists of steel materials used for the building which requires a fireproof structure. It is related with "a covering housing" (refer the claim of patent document 1). This fireproof covering casing is "a casing in which a sheet-like fireproof covering layer is formed on the outer periphery of a casing made of steel at the time of factory shipment" (see paragraph number 0013 of Patent Document 1). Therefore, the invention described in Patent Document 1 has no description or suggestion for solving the problems caused by building a scaffold in the field and securing a painting work place and then applying a fire-resistant paint to a member to be coated. No relationship.

  The invention according to Patent Document 2 is “a steel material having fire resistance, characterized in that the construction steel material before assembly has a coating layer of a fireproof film having a specific thickness formed of a foamed fireproof material” (Patent Document) 2). The invention disclosed in Patent Document 2 is an invention in which a steel material before assembly is made into a steel material having fire resistance performance, and a steel material that does not have fire resistance performance is assembled on-site, and then the fire resistance performance is applied to the assembled steel material. It is not related to the technology that grants.

  The invention according to Patent Document 3 states, “After affixing a foamable refractory sheet to a base material to which fire resistance is to be imparted and affixing a foamable refractory sheet, the foamed refractory paint is applied and straddled across the abutted part. Is a method for forming a foamable refractory layer characterized in that (see claims of Patent Document 3). The foamable refractory sheet used in the method for forming the foamable refractory layer is as follows: “A foamed refractory paint is formed into a sheet by coating it with a known method (1); (2) "impregnated into a fibrous sheet such as, etc." is described as a general description (see paragraph number 0013 of Patent Document 3), but referring to the example of Patent Document 3, as a foamable fireproof sheet, Only an example of impregnating a foamed fire-resistant paint into a fiber sheet is shown (see paragraph numbers 0033 to 0035 of Patent Document 3). In Patent Document 3, any known fire-resistant fire-resistant paint is disclosed. There is no description or suggestion as to whether the film is formed into a sheet by the method.

  Patent Document 4 discloses an improved invention related to the invention described in Patent Document 3. Patent Document 4 includes a “foamable fireproof sheet having a fibrous layer” as a fireproof foam sheet (see paragraph No. 0044 of Patent Document 4). As a foamable fireproof sheet having a fibrous layer, for example, The sheet is a combination of a foamable fireproof paint and a fibrous sheet ”(see paragraph number 0045 of Patent Document 4).

JP-A-8-60763 JP 2002-79606 A JP 2005-60946 A Japanese Patent No. 4549385

  The problem to be solved by the present invention is that it is possible to easily form a cured film of a refractory paint on the surface of a metal material to be painted that is to be painted on-site and forms a structure. The object is to provide a fireproof construction method for a structure.

Means for solving the problems are as follows:
(1) A fireproof construction method for a structure in which a cured film of a fireproof paint is formed on the surface of a metal material to be coated, and the fireproof construction method includes the following sticking step (A) and curing step (B). It is a fireproof construction method of a structure characterized by
(A) a fire-resistant cured film obtained by pre-curing a foam-type fire-resistant paint in a cured film non-formed portion where a cured film of the fire-resistant paint is not formed includes at least one of an epoxy resin cured product and a polyurethane resin, and The pasting step for pasting through the undercoat layer before drying and curing (B) The curing step for drying and curing the undercoat layer (2) The undercoat layer further contains a rust-preventive component ( It is a fireproof construction method for a structure as described in 1),
(3) The cured film non-formation part is a cured film absence part which exists after the cured film formation process which forms a cured film by coating the surface of the metal material to be coated with a foam-type fireproof paint, or is cured. It is a fireproof construction method for a structure according to the above (1) or (2), which is the surface of a metal material to be coated before forming a film,
(4) The fire-resistant cured film adhered to the cured film-unformed portion is a fire-resistant cured film obtained by curing a fire-resistant paint painted on the surface of the base film, and is a site where an adhesion process is performed. The fireproofing method for a structure according to any one of (1) to (3), wherein the fireproofing film is peeled off from the base film.

According to the present invention, for example, a fire-resistant cured film can be formed easily and in a short time in a cured film-free portion described below.
・ Parts of the metal material to be coated that form the structure are covered with other members, and the part where the cured film does not exist after applying the fire-resistant paint ・ The surface of the surface to be coated that forms the structure A fire-resistant coating film was formed over the entire surface, but a part of the fire-resistant coating film was lost due to aging or some accidental loss of the fire-resistant coating film. The part of the surface to be coated that is to be painted where there is no cured film ・ In addition to the above, the part that is not present on the part of the metal material to be coated due to some cause

  According to this fireproofing construction method, it is possible not only to form a fire-hardening film in a short time on the surface of the metal material to be coated of a newly constructed structure or a structure that has changed over time, but also to the metal material to be painted. As a repair or refurbishment of a structure that has already been painted, a fire-resistant cured film can be formed on the structure in a short time by a simple operation.

FIG. 1 is a schematic explanatory view showing a fireproof construction method for a structure according to the present invention. FIG. 2: is a schematic explanatory drawing which shows the base film with a fire-resistant cured film which can be used for the fire-proof construction method of the structure based on this invention. FIG. 3 is a schematic explanatory view showing that the fireproofing method for a structure according to the present invention can be carried out when the surface of the metal material to be coated is non-planar.

  The fireproof construction method for a structure according to the present invention (hereinafter sometimes abbreviated as “fireproof construction method”) is a fireproof construction method for a structure in which a cured film of a fireproof paint is formed on the surface of a metal material to be coated. is there.

  This structure is formed of a metal material to be coated. Examples of the structure include buildings, bridges, gas tanks, and the like formed of metal materials that must have fire resistance. Examples of the portion where the fire resistance in the structure must be maintained include walls, columns, floors, beams, roofs, stairs, frames and the like. There is no restriction | limiting in particular in the shape as a metal material to be coated, For example, a square steel pipe, a round steel pipe, an H-shaped steel pipe, a flat iron plate thru | or a steel plate etc. can be mentioned.

  For example, as shown in FIG. 1, when a foam-type fire-resistant paint is applied to a metal material to be coated forming a structure, a scaffold is fixed to the surface of the metal material 1 to be coated, for example, in order to ensure the painting operation. A fixing member such as a clamp 6 is fixed. For example, when the metal material 1 to be painted is a truss for a bridge, a scaffold assembled to the truss that is the metal material 1 to be painted is fixed to the truss by, for example, the clamp 6. The clamp 6 is in direct contact with the surface of the metal material to be coated constituting the truss.

  Next, a cured film of foam-type refractory paint is formed on the surface of the metal material to be coated, for example, the surface of the truss with a fixing member such as a clamp in contact with the surface of the metal material to be coated.

  The formation of the fireproof coating is usually performed as follows. That is, as shown in FIG. 1, an undercoat paint is applied to the surface of the metal material 1 to be coated to form an undercoat layer 2, and a foam-type fireproof paint is applied to the surface of the undercoat layer to form a fireproof paint layer 3. Then, an intermediate coating is applied to the surface of the fireproof coating layer 3 to form an intermediate coating layer 4, and a top coating is applied to the surface of the intermediate coating layer to form an upper coating layer 5.

The undercoat layer is required to have good adhesion to a steel material and a fire-resistant cured film and to have a property of hardly transmitting water and oxygen that cause corrosion. As the undercoat paint for forming such an undercoat layer, a paint capable of forming an undercoat layer containing at least one of a cured epoxy resin and a polyurethane resin is preferable.
Examples of paints that can form an undercoat layer containing a cured epoxy resin include epoxy resin-based paints and modified epoxy resin-based paints. In addition, a known curing agent such as an amine compound, an acid anhydride, or the like containing at least one of them may be added as necessary, and a one-component type or a two-component type may be used.
Examples of paints that can form an undercoat layer containing a polyurethane resin include, for example, oil-modified polyurethane resin paints such as one-part paints made of a dry liquid modified with isocyanate, moisture-curable polyurethane resin paints such as one-part parts containing free isocyanate, and the like. Examples of the coating material include polyol-curable polyurethane resin coating materials such as a two-component coating material containing a polyisocyanate compound and a polyol compound.
The undercoat layer may be a film in which a cured epoxy resin and a polyurethane resin are mixed.
Furthermore, it is more preferable that the undercoat layer contains a rust preventive component. The undercoat layer containing a rust preventive component can prolong the useful life of the structure. As a method of including the rust preventive component in the undercoat layer, for example, a method of blending the rust preventive component into the paint forming the undercoat layer can be mentioned.
As rust preventive components, zinc, zinc phosphate, aluminum phosphate, zinc phosphite, potassium phosphite, calcium phosphite, aluminum phosphite, zinc calcium phosphate, zinc aluminum phosphate, zinc molybdate, phosphomolybdenum Examples include zinc acid, aluminum phosphomolybdate, calcium molybdate, aluminum tripolyphosphate, and hydrocalumite. These rust preventive components may be used alone or in combination of two or more. Moreover, it is preferable to mix | blend 5-95 weight part of antirust components with respect to 100 weight part of undercoat layer forming components in a coating material.

As the foam-type fireproof paint, various foam-type fireproof paints can be employed as long as the thermal energy is obtained by heating or the like and the coating film itself foams. The foam-type fireproof paint contains at least a synthetic resin, a foaming agent, and a carbonizing agent. Examples of the synthetic resin include acrylic resin, urethane resin, epoxy resin, melamine resin, alkyd resin, vinyl chloride resin, silicone resin, vinyl acetate resin, polyester resin, and / or other polymerizable resins. Examples thereof include a graft copolymer resin obtained by graft copolymerization of a monomer. The foam-type fire-resistant paint can be used in a mode in which the synthetic resin is dissolved in an organic solvent or in a mode in which it is dispersed in water as an emulsion. The foaming agent contains a flame retardant compound such as phosphate such as ammonium polyphosphate and ammonium phosphate, phosphorus, and other phosphorus compounds. Moreover, as a foaming agent other than phosphate, a foaming agent containing amide, melamine, urea or the like can also be suitably used, and it can be used in combination with a phosphate-containing foaming agent. By heating the above foaming agent, non-combustible gas such as ammonia gas is generated and foamed to form a heat insulating layer. At the same time, the temperature of the steel material can be lowered by an endothermic reaction during foaming.
Examples of the carbonizing agent include polyhydric alcohols such as pentaerythritol, dipentaerythritol, tripentaerythritol, and polypentaerythritol. In addition to polyhydric alcohol, melamine or the like can be used as a carbonizing agent, and a carbonizing agent such as melamine can be used in combination with a carbonizing agent such as a polyhydric alcohol. The carbonizing agent is dehydrated and condensed with the foaming agent, and the resulting decomposition gas of the foaming agent contributes to the formation of the foamed layer.
Examples of commercially available foam-type fireproof paints include NARIFIER S605.

  As the intermediate coating, a coating having good adhesion or adhesion between the undercoat layer formed by the undercoat and the topcoat layer formed by the topcoat is selected, and examples thereof include an epoxy resin coating. .

Examples of the top coat include fluororesin-based paints, urethane resin-based paints, chlorinated rubber resin-based paints, and phthalic acid resin-based paints in consideration of weather resistance, water resistance, finish, and the like.
Further, instead of applying the intermediate coating and the top coating, an intermediate coating and top coating may be applied. The use of the intermediate-coating and top-coating paint leads to a reduction in the number of man-hours because the number of times of application such as the application of the intermediate coating and the application of the top coating is reduced. Examples of the intermediate coating and overcoating paint include fluororesin-based paints, urethane resin-based paints, chlorinated rubber resin-based paints, and phthalic acid resin-based paints.

  The undercoat paint, foam-type fireproof paint, intermediate coat paint, and top coat paint applied to the surface of the metal material to be coated can be applied by a known method such as brush coating, spray coating, or roll coater.

  The thickness of the undercoat layer formed by coating is preferably 30 μm to 1 mm, the thickness of the fireproof coating layer 3 is preferably 500 μm to 5 mm, the thickness of the intermediate coating layer is preferably 25 μm to 65 μm, and the thickness of the topcoat layer is 10 micrometers-40 micrometers are preferable. Moreover, when the intermediate coating top coating composition is used, the thickness of the intermediate coating top coating layer is preferably 30 μm to 80 μm.

  Thus, when the formation of the undercoat layer 2 to the overcoat layer 5 is completed on the surface of the metal material 1 to be coated, the fixing member such as the clamp 6 is removed from the surface of the metal material 1 to be disassembled.

  As a result, as shown in FIG. 1, a cavity 8 is generated as a trace of removal of the fixing member, for example, the clamp 6 in the coating layer 7 formed on the surface of the metal material 1 to be coated. In the hollow portion 8, the surface of the metal material to be coated is exposed.

  Therefore, in the present invention, the fire-resistant cured film 9 is used.

  As shown in FIG. 2, the fire-resistant cured film 9 is adhered to the surface of the base film 10. Moreover, the sheet | seat which consists of the base film 10 and the fireproof cured film 9 formed in the surface may be called the site construction sheet | seat 11. FIG.

This fire-resistant cured film can be formed by applying a general-purpose foam-type fire-resistant paint described in paragraph 0024 to the base film and drying it. As a drying method for forming the fire-resistant cured film, it may be dried at room temperature, but the drying time can be shortened by heating to 30 to 60 ° C. and drying. Examples of the foam-type fire-resistant paint that can form a suitable fire-resistant cured film include Nalifier S605.
When preparing this fire-resistant cured film, after applying the foam-type fire-resistant paint, an intermediate coating may be laminated to form a fire-resistant layer / intermediate-layer laminated cured film. No need to paint. Furthermore, in this fire-resistant layer / intercoat layer laminated cured film, after applying the intermediate paint, a top coat may be sequentially laminated to form a fire-resistant layer / intercoat layer / top coat laminated cured film. This eliminates the need to apply intermediate coating and top coating. Further, instead of sequentially laminating the intermediate coating and the top coating, an intermediate coating and top coating may be applied. The intermediate coating layer, top coating layer, or intermediate coating top coating layer may be dried at room temperature, but the drying time can also be shortened by heating to 30 to 60 ° C. and drying.

  In the fireproof construction method of the present invention, as shown in FIG. 1, the undercoat layer 2A is formed by first applying the undercoat paint to the cavity 8 formed by removing the fixing member. The undercoat layer 2A is formed in order to improve the adhesion of the fire-resistant cured film to be applied to the metal material 1 to be coated, and the surface of the metal material 1 to be coated with the clamp 6 attached to the metal material 1 to be coated. For the same reason as the formation of the undercoat layer 2 in order to form the fireproof coating layer 3 with good adhesion.

  Once the undercoat layer 2A is formed in the cavity 8, the fire-resistant cured film 9 is cut out from the field construction sheet 11 so as to have a planar shape similar to the planar shape of the cavity 8.

  The cut out fire-resistant cured film 9 is attached to the surface of the undercoat layer 2A in the cavity 8 before the undercoat layer is dried and cured (touch drying). Adhesion with the undercoat layer is improved by applying the fire-resistant cured film before the undercoat layer is dry-cured (touch-dried). Next, an intermediate coat is further applied to the surface of the fire-resistant cured film 9A adhered to the surface of the undercoat layer 2A to form an intermediate coat layer, and finally the top coat is applied to the surface of the intermediate coat layer. Form a layer.

  In this way, the metal material to be coated was completely fire-resistant coated by attaching a fire-resistant cured film to all the cavities on the surface of the metal material to be painted that can be painted by assembling the scaffolding. A similar state can be achieved.

  The fireproof construction method according to the present invention is not limited to the fireproof coating on the metal material to be coated with the scaffolding as described above.

  For example, assuming that a fire-resistant cured film is formed on all of the cavities formed by the fixing members for fixing the scaffold by carrying out the fire-proof construction method of the present invention on the surface of the metal material to be coated with the scaffolding However, over time, for example, peeling due to aging of the intermediate coating layer, top coating layer and hard refractory layer, or peeling of the intermediate coating layer, top coating layer and refractory coating layer due to the impact of the object on the painted surface Thus, the fireproofing method of the present invention can be applied even when a cured film non-formed portion is generated.

  Of the coating layer 7 formed on the surface of the metal material 1 to be coated, when the fireproof coating layer 3, the intermediate coating layer 4 and the top coating layer 5 are partially peeled, or the intermediate coating layer 4 and the top coating layer 5 are partially Even when peeled off, the fireproof construction method according to the present invention can be carried out. Implementation of the fireproof construction method in this case is maintenance of the paint state in the structure. When the fireproof coating layer 3, the intermediate coating layer 4 and the top coating layer 5 in the metal material 1 to be coated in the structure are partially peeled off, or when the intermediate coating layer 4 and the top coating layer 5 are partially peeled off, The peeling part of the coated metal material 1 is further peeled to expose the metal material 1 to be coated. As described above, an undercoat paint is applied to the exposed surface of the exposed metal material 1 to form an undercoat layer. Before the undercoat layer is dried and cured (touch drying), the surface of the undercoat layer is applied. Then, the fire-resistant cured film 9 cut into a predetermined shape from the on-site construction sheet 11 is pasted.

  In the fireproof construction method of the present invention, the surface of the metal material to be coated 1A is not flat as shown in FIG. 3 as well as the case where the metal material to be painted 1A is flat as in the repair of the maintenance described above. It can also be implemented in some cases. When carrying out the fireproofing method of the present invention on the non-painted metal material 1A, the fireproof cured film 9A is softened by heating the fireproof cured film 9A to a temperature equal to or higher than the Tg of the fireproof cured film with a hair dryer or the like. The fire-resistant cured film is deformed so as to follow the surface of the metal material 1A to be coated. By this method, even if the surface of the metal material to be coated 1A is non-planar, the fire-resistant cured film 9 can be formed on the surface of the metal material to be coated 1A. In this case, in consideration of workability at the construction site, it is preferable to form a fire-resistant cured film in advance using a fire-resistant paint whose Tg is 50 ° C. or less.

The following paints were used.
<Undercoat 1 (Anti-rust component-containing epoxy paint)>
Product name: Epool # 40HB (Zinc phosphate-containing epoxy paint, solid content 50wt%, ratio of epoxy resin to zinc phosphate (mass ratio): 60/40) (Manufacturer name: Dainippon Paint Co., Ltd.)
<Undercoat paint 2 (Rust-preventive component-containing polyurethane paint)>
Product name: V Gran (aluminum phosphate-containing one-component polyurethane paint, solid content 50wt%, ratio of aromatic polyisocyanate prepolymer (moisture curable resin) to aluminum phosphate (mass ratio): 60/40) ( Manufacturer name: Dainippon Paint Co., Ltd.)
<Undercoating paint 3 (epoxy adhesive containing no rust inhibitor)>
Product name: Quick 30 (Manufacturer name: Konishi Co., Ltd.)
<Foaming fireproof paint>
Product name: Base coat S605 (Acrylic copolymer-containing fireproof paint. Ammonium polyphosphate and melamine are used as foaming agent. Dipentaerythritol is used as carbonizing agent. Tg of coating film: 50 ° C) (Manufacturer name: Nalifier)
<Intermediate paint>
Product name: V Top H Smile Intermediate (Epoxy) (Manufacturer: Dainippon Paint Co., Ltd.)
<Topcoat paint>
Product name: V Top H Smile Topcoat (Polyurethane) (Manufacturer: Dainippon Paint Co., Ltd.)
<Thick film type, intermediate coating top coating>
Product name: V Top HB Smile (Polyurethane) (Manufacturer: Dainippon Paint Co., Ltd.)

<Site construction sheet 1>
An on-site construction sheet was created as follows.
A foam fire-resistant paint (base coat S605) was applied to a polypropylene plate by a spray coating method so as to have a film thickness of 1000 μm, and then dried under conditions of forced drying at 50 ° C. to obtain a fire-resistant cured film.

<Site construction sheet 2>
An on-site construction sheet was created as follows.
A foam fireproof paint was applied to a polypropylene plate by a spray coating method so as to have a film thickness of 1000 μm, and then dried under the condition of forced drying at 50 ° C. After drying, an intermediate coating (product name V Top H Smile intermediate coating) was applied by a brush coating method to a film thickness of 30 μm and forcedly dried at 50 ° C. to obtain a fire-resistant layer / intermediate layer laminated cured film. .

Example 1
1. Substrate adjustment Steel plate was used as the metal material to be coated. A hanging chain clamp was attached to this steel plate. The undercoat paint is applied to the surface of a steel plate with a hanging chain clamp attached thereto to form an undercoat layer, and a foam-type fireproof paint is applied to the surface of the undercoat layer to form a fireproof paint layer. An intermediate coating layer was formed on the surface of the fireproof coating layer to form an intermediate coating layer, and a top coating layer was formed on the surface of the intermediate coating layer to form an upper coating layer.
Subsequently, the hanging chain clamp was removed from the plate material. When the hanging chain clamp was removed, the steel material was exposed on the surface of the steel plate material as a trace of the clamp being mounted in the paint layer. Therefore, using a hand tool such as a wire brush or a power tool such as a disc grinder, the base is adjusted on the trace of the clamp that is formed in the paint layer and the steel material is exposed, and the rust and dead film are removed. The membrane was roughened. Furthermore, rust and dust from the coating film generated by the substrate adjustment were removed with a duster brush and cleaned.
2. Undercoat layer construction On the surface of the steel material on which the base was adjusted, the rust preventive component-containing epoxy paint (Epool # 40HB) was applied by a brush coating method to a film thickness of 60 μm.
3. Fireproof layer construction After the epoxy paint containing the rust preventive component is applied, the polypropylene plate in the on-site construction sheet 1 is bent to separate the fire-resistant cured film from the polypropylene plate before proceeding to touch drying. It cut out to the magnitude | size which can be stuck on a clamp mounting trace, and the cut out fire-hardening film | membrane was stuck on the said clamp mounting trace.
4). Intermediate coating layer / top coating layer construction An intermediate coating material was applied to the surface of the fire-resistant cured film adhered to the clamp mounting trace by a brush coating method so as to have a film thickness of 30 μm. Further, after the intermediate coating was cured, the top coating was applied by a brush coating method to a film thickness of 25 μm.
Thus, a fire-resistant coating film composed of a plurality of layers was formed.

(Example 2)
1. Base preparation, undercoat layer construction, and fireproof layer construction Base preparation, undercoat layer construction, and fireproof layer construction were carried out in the same manner as in Example 1.
2. Construction of intermediate coating and overcoating layer The same procedure as in Example 1 was carried out except that the intermediate coating and overcoating layer (V-top HB smile) was applied so that the film thickness of the intermediate coating and overcoating layer was 55 μm.
Thus, a fire-resistant coating film composed of a plurality of layers was formed.

(Example 3)
1. Base preparation and undercoat layer construction Base preparation and undercoat layer construction were carried out in the same manner as in Example 1.
2. Fireproof layer / intermediate coating layer construction After the epoxy paint containing the rust preventive component is applied, the fireproof cured film is separated from the polypropylene plate by curving the polypropylene plate in the on-site construction sheet 2 before proceeding to touch drying. The cured film was cut to a size that could be attached to the clamp attachment trace, and the cut fire-resistant layer / intercoat layer laminated cured film was attached to the clamp attachment trace.
3. Topcoat layer construction The topcoat layer was formed in the same manner as in Example 1.
Thus, a fire-resistant coating film composed of a plurality of layers was formed.

Example 4
In this embodiment, a fireproof construction method is carried out as a repair.
1. Base adjustment When construction materials or chains hit the construction site and the fireproof construction is scratched, the ground is adjusted in the same way as in Example 1 to remove rust and dead film, and the active film. Was coarsened.
2. Undercoat layer construction, fireproof layer construction, intermediate coat layer construction and topcoat layer construction As in Example 1, undercoat layer construction, fireproof layer construction, intermediate coat layer construction and topcoat layer construction were carried out.
Thus, a fire-resistant coating film composed of a plurality of layers was formed.

(Example 5)
Example 5 is an example in which fireproofing was applied to the protruding corner of an H-shaped steel as a steel material having an uneven shape.
1. Base preparation and undercoat layer construction Base preparation and undercoat layer construction were carried out in the same manner as in Example 1.
2. Fireproof layer construction The polypropylene plate in the on-site construction sheet 1 is bent to separate the fire-resistant cured film from the polypropylene plate, and the fire-resistant cured film is sprayed on the separated fire-resistant cured film with a hair dryer at a temperature of 80 to 100 ° C. After heating to a temperature exceeding the glass transition temperature to soften the refractory hardened film, the refractory hardened film is deformed according to the shape of the protruding corner of the H-shaped steel, and follows the shape of the protruding corner of the H-shaped steel. Pasted on.
3. Intermediate coating layer and top coating layer construction The intermediate coating layer and the top coating layer were formed in the same manner as in Example 1.
Thus, a fire-resistant coating film composed of a plurality of layers was formed.

(Example 6)
1. Base adjustment It carried out similarly to Example 1. FIG.
2. Undercoat layer construction A rust-preventive component-containing polyurethane paint (V Gran) was applied to the surface of the base material that had been prepared to have a film thickness of 60 μm.
3. Fireproof layer construction After applying the antirust component-containing polyurethane paint, before progressing to touch drying, the polypropylene plate in the on-site construction sheet 1 is bent to separate the fireproof cured film from the polypropylene plate, and the separated fireproof cured film is It cut out to the magnitude | size which can be stuck on a clamp mounting trace, and the cut out fire-hardening film | membrane was stuck on the said clamp mounting trace.
4). Intermediate coating layer and top coating layer construction The intermediate coating layer and the top coating layer were formed in the same manner as in Example 1.
Thus, a fire-resistant coating film composed of a plurality of layers was formed.

(Example 7)
1. Base adjustment It carried out similarly to Example 1. FIG.
2. Undercoat layer construction A rust preventive component-free epoxy adhesive (Quick 30) was applied to the base material surface that had been prepared to have a film thickness of 100 μm.
3. Fire-resistant layer construction After applying the anti-rust component-free epoxy adhesive, a fire-resistant cured film prepared in advance was pasted before proceeding to dry to touch.
4). Intermediate coating layer and top coating layer construction The rust preventive component-free epoxy adhesive was cured and the intermediate coating was applied under the conditions of Example 1. Further, a top coating was applied under the conditions of Example 1.
Thus, a fire-resistant coating film composed of a plurality of layers was formed.

(Comparative Example 1)
1. Base preparation and undercoat layer construction In the same manner as in Example 1, the base preparation and undercoat layer construction were performed.
2. Fire-resistant layer construction After curing the rust-preventive component-containing epoxy paint, the fire-resistant paint is applied to a film thickness of 1000 μm (250 μm coating per day, applied for 4 days), and then naturally dried for 7 days. A 1000 μm refractory layer was formed.
3. Intermediate coating layer and top coating layer construction An intermediate coating was applied to the refractory layer and its surroundings under the conditions of Example 1. Further, after the intermediate coating was cured, the top coating was applied in the same manner as in Example 1.
Thus, a fire-resistant coating film composed of a plurality of layers was formed.

(Comparative Example 2)
1. Base preparation and undercoat layer construction In the same manner as in Example 1, the base preparation and undercoat layer construction were performed.
2. Intermediate coating layer and top coating layer construction A fireproof layer was not provided, and the intermediate coating material was applied under the conditions of Example 1 after the rust preventive component-containing epoxy coating material was cured. Further, after the intermediate coating was cured, the top coating was applied under the conditions of Example 1.
Thus, a fire-resistant coating film composed of a plurality of layers was formed.

(Performance evaluation of laminated coating material)
With respect to the laminated coating material obtained in Examples 1 to 7 and Comparative Examples 1 and 2, fire resistance performance, anticorrosion performance, and construction days in the field were evaluated.

1. Fire resistance performance After putting the laminated coating material obtained in Examples 1 to 7 and Comparative Examples 1 and 2 into an electric furnace, the temperature was raised to 600 ° C. At that time, the expansion ratio of the fireproof coating was evaluated.
The expansion ratio is shown by the following calculation formula.
Foaming ratio = (film thickness after foaming) / (film thickness before foaming)

2. Anticorrosion performance The following durability evaluation was carried out.
First stage: 21 days immersed in water Second stage: Freezing and thawing test (-20 ° C (nighttime) ← → 35 ° C (daytime)) 21 days Third stage: Combined cycle test under the conditions shown in Table 1 below The 21-day evaluation criteria are as follows.
○: Rust, swelling, and cracking are not recognized.
X: There is rusting and swelling.

3. The number of construction days on site The number of construction days on site was converted.

  The evaluation results of 1 to 3 are shown below.

DESCRIPTION OF SYMBOLS 1 Metal material to be coated 2 Undercoat layer 3 Fireproof coating layer 4 Intermediate coating layer 5 Topcoat layer 6 Clamp 7 Coating layer 8 Hollow part 9 Fire-resistant cured film 10 Base film 11 On-site construction sheet

Means for solving the problems are as follows:
(1) A fireproof construction method for a structure in which a cured film of a fireproof paint is formed on the surface of a metal material to be coated, and the fireproof construction method includes the following sticking step (A) and curing step (B). It is a fireproof construction method of a structure characterized by
(A) Present after a cured film forming process for forming a cured film by coating the surface of the metal material to be coated with a foam-type fire resistant paint, and in a cured film absence portion where the cured film of the fire resistant paint is not formed, Adhesion process for adhering a fire-resistant cured film obtained by pre-curing a foam-type fire-resistant paint through an undercoat layer containing at least one of an epoxy resin cured product and a polyurethane resin and before being dried and cured (B) Curing step (2) for drying and curing the undercoat layer The undercoat layer further includes a rust preventive component, and is a fireproof construction method for a structure according to the above (1) ,
(3) The fire-resistant cured film adhered to the cured film- free portion is a fire-resistant cured film formed by curing a fire-resistant paint painted on the surface of the base film, and is a site where an adhesion process is performed. The fireproofing method for a structure according to (1) or (2) , wherein the fireproofing film is peeled off from the base film.

Claims (4)

A fireproof construction method for a structure in which a cured film of a fireproof paint is formed on the surface of a metal material to be coated, wherein the fireproof construction method includes the following sticking step (A) and curing step (B). Fireproof construction method for structures.
(A) a fire-resistant cured film obtained by pre-curing a foam-type fire-resistant paint in a cured film non-formed portion where a cured film of the fire-resistant paint is not formed includes at least one of an epoxy resin cured product and a polyurethane resin; and Adhesion process for adhering via an undercoat layer before drying and curing (B) Curing process for drying and curing the undercoat layer   The fireproofing method for a structure according to claim 1, wherein the undercoat layer further contains a rust preventive component.   The cured film non-formed part is a cured film non-existing part which exists after the cured film forming process for forming a cured film by coating the surface of the metal material to be coated with a foam-type refractory paint, or forms a cured film. The fireproofing method for a structure according to claim 1 or 2, which is a surface of a metal material to be coated before the coating.   The fire-resistant cured film adhered to the cured film-unformed portion is a fire-resistant cured film obtained by curing a fire-resistant paint painted on the surface of a base film, and the base is used at a site where an adhesion process is performed. The fireproof construction method for a structure according to any one of claims 1 to 3, wherein the fireproof cured film is peeled off from the material film.

Images