JP2016223203A - Coating structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a fixing method of a heat foaming sheet and workability and obtain stable heat-resistant protective property for a coating structure that has H-shaped or I-shaped steel frame for composing a steel structure and a heat foaming sheet disposed so as to cover the steel frame.SOLUTION: A coating structure has H-shaped or I-shaped steel frame for composing a steel structure, a floor material positioned above the steel frame and a heat foaming sheet that is disposed so as to cover the steel frame. The floor material is formed by installing a slender tabular stationary member with multiple ratchet parts along a longer direction of an upper flange of the steel frame on undersurface of the floor material and both ends of the heat foaming sheet are fixed by penetrating the ratchet parts on the stationary member and being bent at the sections that penetrated the ratchet parts.SELECTED DRAWING: Figure 1

Description

The present invention relates to a novel 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 a steel frame constituting a column, a beam, or the like rapidly decreases. On the other hand, a coating structure is known in which a coating material having heat resistance protection is coated on a steel frame to delay a rise in the temperature of the steel frame during a fire and suppress a decrease in the physical strength of the steel frame.

As the coating structure, for example, a wet coating structure in which a mixed composition obtained by appropriately mixing an inorganic binder such as cement with an inorganic fibrous substance, a lightweight aggregate, a crystal water-containing inorganic powder, etc. is thickened on the surface of the steel frame is known. It has been. Further, instead of the wet coating structure, there is also known a dry coating structure using a dry material such as an inorganic fiber mixed mat, rock wool, fireproof board, thermal foamable sheet or the like. The dry-type coating structure is preferable because it is excellent in workability and finish as compared with the wet-type coating structure.

  As a dry coating structure, for example, in Patent Document 1, a fixing pin is passed through an inorganic hard coating material, and the tip of the fixing pin is welded to a steel material by a welding gun while pressing the tip of the fixing pin against the steel material. A coating structure is described. Patent Document 2 describes a method of fixing a felt covering material to a steel beam by stud welding.

Utility Model Registration No. 3120358 JP 2005-179905 A

As in Patent Document 1 and Patent Document 2, a dry coating structure often requires a welding operation during construction. However, a spark or the like generated at the time of welding may cause a defect in the covering material, which may reduce the heat resistance protection performance. In addition, since there is a risk of fire or the like, it is necessary to install a spark curing sheet or the like during construction.

The present invention relates to a covering structure including an H-type or I-type steel frame (hereinafter also simply referred to as “steel frame”) constituting a steel structure, and a thermally foamable sheet provided so as to cover the steel frame. The purpose is to improve the fixing method of the heat-foamable sheet, improve the workability, and obtain stable heat-resistant protection.

  As a result of intensive studies to achieve the above object, the present inventor has installed a specific fixing member on the lower surface of the flooring located on the steel frame, and has a fire resistant sheet in which the thermally foamable sheet is fixed by the fixing member. A coating structure was conceived and the present invention was completed.

That is, the fireproof covering structure of the present invention has the following characteristics.
1. An H-type or I-type steel frame constituting the steel structure;
A flooring located above the steel frame;
A covering structure having a thermally foamable sheet provided so as to cover the steel frame,
The flooring is provided with an elongated plate-like fixing member having a plurality of pawls along the upper flange longitudinal direction of the steel frame on the flooring lower surface,
A covering structure characterized in that both end portions of the thermally foamable sheet penetrate through the claw portion of the fixing member, and the penetration portion of the claw portion is fixed by being bent.
2. The covering structure according to claim 1, wherein a plurality of thermally foamable sheets are provided in a longitudinal direction of the steel frame, and a joint portion between the thermally foamable sheets has an overlapping portion.

Above 1. ~ 2. In the invention according to the present invention, when the thermally foamable sheet is applied to the steel frame, the welding work is unnecessary, there is no fear of fire, and there is no possibility that the thermally foamable sheet is damaged. Further, the thermally foamable sheet can be fixed easily and efficiently around the steel frame, and stable heat-resistant protection can be obtained.

It is (I) perspective view and (II) sectional view showing an example of the covering structure of the present invention. It is sectional drawing which shows an example of the steel frame used by this invention. It is a figure which shows the example [variation (I) (II) (III)] of the fixing member used by this invention. It is sectional drawing which shows the variation of the fixing member used by this invention. It is sectional drawing which shows an example of the steel frame used by this invention. It is sectional drawing which shows another example of this invention covering structure.

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

  An example of the covering structure of the present invention is shown in FIG.

FIG. 1 is a (I) perspective view and (II) sectional view showing an example of the covering structure of the present invention. In FIG. 1, it is comprised from the H-type steel frame 1 provided in the floor material 4, the floor material 4 located on the H-type steel frame 1, the fixing member 2 installed in the floor material lower surface 4a, and the thermally foamable sheet 3 The heat-foamable sheet 3 is provided so as to cover the periphery of the H-type steel frame 1 excluding the surface in contact with the flooring material together with the air layer 5, and both ends of the heat-foamable sheet 3 are fixed by the fixing members 2. ing.

  FIG. 2 shows a cross-sectional view of an H-type steel frame used in the present invention. As the H-shaped steel frame 1 according to the present invention, an H-shaped steel frame 1 having an H-shaped cross section as shown in FIG. 2 and having an upper flange 1a and a lower flange 1b connected by a plate-like web 1c is used. . The H-shaped steel frame has a wide flange width and parallel flange inner and outer surfaces. In addition, in this invention, the direction which contact | connects the flooring 4 is called an upper flange, and the opposite side is called a lower flange.

  The flooring 4 positioned on the steel frame may be any known material on which the steel frame is installed, and preferably has heat resistance, for example, ALC floor, PC floor, deck plate, deck plate concrete floor. Can be mentioned. In the present invention, the fixing member 2 having a plurality of claw portions is installed on the lower surface of the floor material 4 along the longitudinal direction of the upper flange of the steel frame. The place where the fixing member 2 is installed may be set at an arbitrary place on the floor material lower surface 4a, but in the present invention, it is preferably near the upper flange 4a 'of the steel frame.

FIG. 3 shows an example of the fixing member 2 used in the present invention. As shown in FIG. 3, the fixing member 2 of the present invention has an elongated plate shape 2b having a plurality of claw portions 2a, and the claw portions 2a are bent to fix the thermally foamable sheet 3. The material has heat resistance, and for example, a steel plate, a stainless steel plate, a galvanized steel plate, or the like can be used.

The length (L) of the fixing member 2a may be appropriately set according to the length of the steel frame. For example, the length of the steel frame may be the same, or a length shorter than the length of the steel frame (preferably 500 to 5000 mm, more preferably 1000 to 4000 mm) may be installed and used in the longitudinal direction of the steel frame. Moreover, what is necessary is just to set the width | variety (w) of the fixing member 2 suitably, Preferably it is 10-100 mm (more preferably 20-80 mm).

Specifically, the fixing member 2 of the present invention is provided with a required number of claw portions 2a on an elongated member 2b having a desired length. The claw portion 2a is formed by providing a slit in the elongated member 2b (2a-1), or by installing a stud pin or the like on the elongated member 2b by welding (2a-2). It may be a thing. The direction in which the pawl portion 2a is bent may be set as appropriate. For example, the longitudinal direction (left-right direction), the short direction (up-down direction) of the elongated member 2b, or a combination thereof may be used. Here, when the claw portion 2a is the above (2a-1), in the case where the claw portion 2a is erected in the longitudinal direction of the elongated member 2b as shown in FIGS. 3 (I) and (III), the longitudinal direction of the elongated member 2b ( It is preferable to bend in the short direction (vertical direction) when the claw portion 2a is erected in the short direction of the elongated member 2b as shown in FIG. 3 (II). In addition, in the case of the fixing member 2 of FIG. 3 (II), it is preferable to bend the claw part 2a upward.

Further, the claw portions 2a are arranged in one row in the longitudinal direction of the elongated member 2b as shown in FIGS. 3 (I) and (II), or in two rows or more as shown in FIG. Is preferably 50 to 400 mm (more preferably 10 to 200 mm), and it is preferable that they are installed approximately evenly. Particularly, in the present invention, the claw portions 2a are preferably arranged in two or more rows, and further, for example, as shown in FIG. 3 (III), the claw portions 2a in each row are preferably arranged alternately. In this case, the stability when the thermally foamable sheet 3 is fixed increases.

The shape of the claw portion 2a may be any shape as long as it can penetrate the thermal foamable sheet 3, bend the penetration portion of the claw portion 2a, and immobilize the thermal foamable sheet 3. For example, in the case of the claw portion 2a-1 Is an inverted V shape, an inverted U shape, a trapezoidal shape, a rectangular shape, and the like, and in the case of the claw portion 2a-2, there are a needle shape, a columnar shape, a conical shape, a rectangular shape, etc. (Height h) is preferably 10 to 50 mm (more preferably 15 to 40 mm). In such a case, the stability when the thermally foamable sheet 3 is fixed is further increased. On the other hand, the cross-sectional shape of the elongated member 2b is not particularly limited, and a flat plate shape as shown in FIG. 4 (I), a folded plate shape as shown in FIGS. 4 (II) to (V), or any other shape. Can be used.

The thermally foamable 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 thermally foamable sheet 3, those containing a resin component, a flame retardant, a foaming agent, a carbonizing agent, and a filler as constituent components are suitable. Among these, as the resin component, for example, thermoplastic resins such as acrylic resin and vinyl acetate resin, ammonium polyphosphate as the flame retardant, melamine, dicyandiamide, azodicarbonamide, etc. as the foaming agent, pentane as the carbonizing agent Examples of fillers such as erythritol and dipentaerythritol include titanium dioxide, calcium carbonate, and inorganic fibers.

The blending ratio of each component is 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 50 to 50 parts by weight of a filler with respect to 100 parts by weight of the resin component. The amount is preferably 160 parts by weight.
The thickness of the thermally foamable sheet 3 may be appropriately set depending on the application site and the like, but is preferably about 0.2 to 10 mm, more preferably about 0.5 to 6 mm.

Moreover, although the heat foamable sheet 3 of this invention may be comprised only from the sheet | seat containing the said structural component, the fibrous sheet may be laminated | stacked on the back surface (member side). As such a fibrous sheet, for example, a known sheet containing organic fibers and / or inorganic fibers can be used.

The covering structure of the present invention can be formed, for example, by the following method.
(1) Step of installing the fixing member 2 on the flooring 4 installed on the H-type steel frame 1 by welding or the like along the longitudinal direction of the upper flange 1a of the H-type steel frame 1 (2) Next, the fixing member A step of inserting one end portion of the thermally foamable sheet 3 into the second claw portion 2a and penetrating it;
(3) Step of bending and fixing the claw portion 2a (4) Further, the periphery of the H-shaped steel frame 1 is covered so that the thermally foamable sheet 3 covers, and the other end of the thermally foamable sheet 3 is also a fixing member A step of inserting and penetrating into the second claw portion 2a,
(5) Step of bending and fixing the claw portion 2a The step (3) may be performed simultaneously with the step (5).

In the covering structure of the present invention, when a plurality of thermally foamable sheets 3 are provided in the longitudinal direction of the H-shaped steel frame 1, it is preferable that the joint portion between the thermally foamable sheets 3 has an overlapping portion A. In the covering structure of the present invention, the heat-foamable sheet 3 covering the lower flange 1b of the H-shaped steel frame 1 may be fixed via an adhesive as described above.

  The covering structure of the present invention can be used by laminating two or more thermally foamable sheets 3. When two or more heat-foamable sheets 3 are laminated, a heat-foamable sheet preliminarily laminated with an adhesive or the like can be used, but the heat-foamable sheet 3 is continuously formed in the steps (2) and (4). What is necessary is just to bend and fix the nail | claw part 2a, after inserting in the nail | claw part 2a of the fixing member 2 and making it penetrate.

  Furthermore, the coating structure of the present invention can also cover the outer periphery of the thermally foamable sheet 3 with the inorganic sheet 7. In this case, it is possible to sufficiently prevent the carbonized heat insulating layer formed by foaming the thermally foamable sheet 3 due to fire or the like from dropping. In the present invention, the thermally foamable sheet 3 and the inorganic sheet 7 may be coated so as to be in contact with each other, or may be coated by providing an air layer. Examples of the inorganic sheet 7 include a metal film, an inorganic fibrous sheet, and silica cloth.

  In the present invention, when the inorganic sheet 7 is coated, a heat-foamable sheet obtained by previously laminating the inorganic sheet 7 with an adhesive or the like can be used as the heat-foamable sheet 3, but the above steps (2) and (4) After inserting the heat-foamable sheet 3 into the pawl portion 2a of the fixing member 2 and penetrating it, the inorganic sheet 7 may be inserted into the pawl portion and penetrated, and the pawl portion 2a may be bent and fixed.

The present invention is applicable to an I-type steel frame as well as the above-described H-type steel frame.

FIG. 5 shows a cross-sectional view of a type I steel frame used in the present invention. As the I-type steel frame 11 of the present invention, one having an I-shaped cross section and formed by connecting the upper flange 11a and the lower flange 11b with a plate-like web 11c is used. The I-type steel frame 11 is usually inclined on the inside of the flange.

In FIG. 6, it is comprised from the I-type steel frame 11, the flooring 4 located on the I-type steel frame 11, the fixing member 2 installed on the flooring lower surface 4a, and the thermally foamable sheet 3, and the flooring 4 The three surfaces of the I-type steel frame 11 excluding the surface in contact with the heat foamable sheet 3 are provided so as to cover the air layer 5 together with the heat foamable sheet 3, and both ends of the heat foamable sheet 3 are fixed by the fixing member 2.

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

(Thermal foaming sheet)
A pressure kneader in which a mixture of 100 parts by weight of a thermoplastic resin (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 set at 120 ° C. After kneading with kneading to prepare a kneaded product for a heat-foamable sheet, the kneaded product is laminated on a glass nonwoven fabric and processed into a sheet by a rolling roller to produce a heat-foamable sheet (450 mm × 1200 mm) having a film thickness of 1.5 mm. did.

As shown in FIG. 2, an H-shaped steel frame (H400 × 200 × 8 × 13 mm, length 1200 mm) was installed on the floor plate (ALC plate). Next, fixing members [(L) 3000 mm × (W) 24 mm] shown in FIG. 3 (I) along the longitudinal direction of both edge portions of the upper flange of the H-shaped steel frame are placed on the floor material lower surface (FIG. 2-4a ′). Four pieces were welded and fixed. According to FIG. 1, insert one end of the thermally foamable sheet so that the glass nonwoven fabric side of the thermally foamable sheet produced on the pawl of the fixing member is the H-type steel frame side, and fold the pawl. Then, wind around the H-shaped steel frame so that the heat-foamable sheet 3 covers it. Insert the other end of the heat-foamable sheet into the nail of the fixing member, and fold the nail. Fixed. Further, the joint portion between the heat-foamable sheets was used as a test body in which the adhesive was wound so that the overlap width was 20 mm.
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. H-type steel frame 1a. Upper flange 1b. Lower flange 1c. Web 11. Type I steel frame 11a. Upper flange 11b. Lower flange 11c. Web2. Fixing member 2a. Claw part 2b. 2. Elongated plate Thermally foamable sheet4. Floor material 4a. Floor material lower surface 5. Air layer A. Overlap

Claims (2)

An H-type or I-type steel frame constituting the steel structure;
A flooring located above the steel frame;
A fireproof covering structure having a thermally foamable sheet provided so as to cover the steel frame,
The flooring is provided with an elongated plate-like fixing member having a plurality of pawls along the upper flange longitudinal direction of the steel frame on the flooring lower surface,
A covering structure characterized in that both end portions of the thermally foamable sheet penetrate through the claw portion of the fixing member, and the penetration portion of the claw portion is fixed by being bent. The covering structure according to claim 1, wherein a plurality of thermally foamable sheets are provided in a longitudinal direction of the steel frame, and a joint portion between the thermally foamable sheets has an overlapping portion.

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