JP4994914B2 - Thin-walled lightweight steel structure outer wall structure and roof structure - Google Patents

Description

  TECHNICAL FIELD The present invention relates to an outer wall structure and a roof structure applied to a thin plate lightweight steel building (residential / non-residential) represented by a steel house.

  KC-type steel house is a framed wall construction method in which the frame material of a wooden 2 × 4 house is replaced with steel (light-weight steel with a thickness of about 1 mm with galvanization). It has become an industry standard. This KC type steel house has been limited to two-story buildings, but in November 2001 it was promulgated and enforced by the Ministry of Land, Infrastructure, Transport and Tourism. No. 1641), it is now possible to build up to 3 stories.

  Therefore, the development of a high-strength, high-rigidity outer wall structure that can handle three-story buildings is underway. For example, cement-based inorganic materials, silicic acid-containing substances, lightweight aggregates, and reinforcing fibers are dispersed in water. A bearing wall for steel houses has been proposed, in which a single-layer mat formed by dewatering and forming a slurry is formed by laminating multiple layers, press-molding, and curing and curing the cement plate as a structural face material. (See Patent Document 1).

  Moreover, when constructing a three-story apartment house or a detached house in an urban area, specifically in a fireproof area, generally one hour fire resistance is required. For this reason, in addition to the structural performance mentioned above, the provision of fireproof performance is also essential for thin, lightweight steel structures. On the other hand, the present inventors conventionally double-stretched a structural load bearing material made of a non-combustible material and an indoor fireproof covering structural load bearing material on a thin lightweight steel frame material. In addition to constituting the main part above, the heat insulating layer part is constructed by arranging the foamed plastic-based heat insulating material and the exterior material grounding / wooden rim for ventilation on the outdoor side of the structural strength surface material in this order. A thin lightweight steel shaped outer wall structure in which a ceramic-type exterior material is installed on the outer side of the trunk edge is proposed (see Patent Document 2). In the outer wall structure described in Patent Document 2, in the case of an outdoor fire, the exterior material and the heat insulating material are preceded to resist the fire, so the temperature rise of the thin and light steel can be prevented, and even after the fire is extinguished, The load carrying capacity is maintained. In addition, during an indoor fire, the indoor fireproof covering material bears the fireproof performance, so that it is possible to prevent damage to the main parts in terms of structural strength.

  On the other hand, recently, a house is also required to have a thermal performance that achieves both a comfortable indoor space and energy saving. The steel house has a thermal insulation and ventilation method as standard specifications, so it has high thermal performance, especially in winter heating, which is effective for energy saving, but it is not always effective for energy saving in cooling. It wasn't. In view of this, the present inventors have developed and proposed a heat shield technique that is effective for energy saving even in summer cooling (see Patent Document 3). In the outer wall / roof structure described in Patent Document 3, a film having both high solar reflectance and emissivity on the outer surface side and low emissivity on the inner surface side is provided on the outer side of the exterior material. Is provided with a low emissivity coating to improve the heat insulation and heat insulation performance of the outer wall and roof.

Japanese Patent No. 3617837 JP 2004-346590 A JP 2006-177136 A

  However, the conventional techniques described above have the following problems. That is, in the outer wall structure described in Patent Documents 1 and 2, since the fiber reinforced cement board (non-wooden material) is used as the outer wall material, the structural performance and fire resistance of the building are improved compared to the conventional structure. Although the performance can be remarkably improved, since this face material uses an inorganic material and is manufactured by a wet method, there is a problem in that the quality varies although it is extremely small. In addition, such a face material has a problem in that a strength is lowered when water is absorbed from a cutting edge at the time of manufacture, and thus a sealer treatment for ensuring waterproofness is required.

  On the other hand, in the outer wall / roof structure described in Patent Document 3, the fireproof performance has not been studied. In addition, in the outer wall / roof structure described in Patent Document 3, a low radiation sheet such as aluminum foil is pasted on the back surface of the exterior material and the heat insulation material surface facing the ventilation layer, and heat is shielded from the high temperature environment caused by, for example, summer solar radiation. However, in the case of outdoor fires, the low-radiation sheet is oxidized and disappeared early in the outdoor fire before the thermal effect is minimized by thin-walled lightweight steel. There is a risk that.

  In addition, there is a possibility that a 4-story steel house will be realized in the future, in which case it is expected that higher quality and stable fireproof performance will be required, and therefore higher quality and stable fireproof performance. A structure is desired.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a thin plate lightweight steel-made outer wall structure and a roof structure that are excellent in fireproof performance.

The thin-walled lightweight steel structure outer wall structure according to the present invention is an outer-wall-insulation-type outer wall structure in which a heat insulating material is disposed between a frame material made of a thin light-weight steel and an exterior material, A face material is provided between the frame material, and a gap serving as a ventilation layer is formed between the heat insulating material and the exterior material by disposing a ventilation trunk edge. It has a flat plate steel plate plated on at least one surface and a corrugated steel plate plated on at least one surface, and the plate steel plate and the corrugated steel plate are plated. By superimposing the applied surfaces so as to face each other, a low radiation space is formed, and corrugated convex portions and corrugated concave portions in the corrugated steel sheet are alternately connected in a substantially vertical direction. Features. In addition, the surface of the corrugated steel sheet on the frame material side is also subjected to plating treatment to give low radiation performance.

The roof structure according to the present invention is a roof structure of an external heat insulation system in which a heat insulating material is disposed between a frame material made of thin lightweight steel and a roof gutter material, between the heat insulating material and the frame material. Is provided with a face material, and a gap serving as a ventilation layer is formed between the heat insulating material and the roof covering material by arranging a ventilation trunk edge, and the face material is plated on at least one surface. The plate-shaped steel plate that has been subjected to the treatment and the corrugated steel plate that has been plated on at least one surface thereof, and the surfaces that have undergone the plating treatment on the plate-like steel plate and the corrugated steel plate are By overlapping so as to face each other, a low radiation space is formed, and corrugated convex portions and corrugated concave portions in the corrugated steel sheet are alternately connected in a substantially vertical direction. In addition, the surface of the corrugated steel sheet on the frame material side is also subjected to plating treatment to give low radiation performance.

  As for the face material in the outer wall structure and the roof structure, the flat steel plate may be disposed between the heat insulating material and the corrugated steel plate, and the corrugated steel plate may be disposed on the frame material side. .

Further, the face material is a plated steel plate in which aluminum is condensed to the surface layer, and the surface emissivity of the surface facing the void formed by the flat plate steel plate and the corrugated steel plate is 0.6 or less. This is true.

Further, the heat insulating material may be formed by foaming plastic, in which case, the outer wall structure, before Kigaiso material inside the ventilation layer and the opening for introducing outside air into the ventilation layer air may have an opening is provided for discharging, and in the roof structure, this is the surface of the outdoor side of the heat insulating material is provided roofing material folding plate like steel sheathing or metal, before Symbol roof The dredging material may be provided with an opening for taking outside air into the ventilation layer and an opening for discharging the air inside the ventilation layer.

  According to the present invention, a surface material composed of a plate-like plated steel plate and a corrugated steel plate is disposed between a frame material made of thin lightweight steel and a heat insulating material, and surface radiation is provided on the outdoor side of the frame material. Since the space with a low rate is formed, it is possible to suppress the temperature rise of thin lightweight steel in outdoor fire, and to stably exhibit the fireproof performance equivalent to or better than the conventional outer wall structure / roof structure. it can. Furthermore, since the surface of the corrugated plated steel sheet on the frame material side also has a low surface emissivity, the amount of heat radiation to the frame material side is reduced, which is effective for lowering the temperature environment during a fire.

  The best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings. The outer wall structure of this embodiment is an outer wall structure of an outer-layer heat insulation system applied to a thin plate lightweight steel building represented by a steel house. FIG. 1 is a cross-sectional view showing the outer wall structure of the present embodiment. As shown in FIG. 1, the outer wall structure of the present embodiment has a frame constituted by a stud 1 and a runner (not shown) made of a thin lightweight steel having a plate thickness of, for example, 1.0 mm. An interior material 3 such as a gypsum board is fixed to one indoor flange 1a by a fastener 5a such as a nail or a drill screw.

  On the other hand, a face material 4 formed of a steel plate and a heat insulating material 7 made of foamed plastic such as polystyrene foam are fixed to the outdoor flange 1b of the stud 1 in order from the stud 1 side by fasteners 5a and 5b, respectively. ing. A plurality of ventilator rims 8 are fixed on the outdoor surface of the heat insulating material 7 at predetermined intervals, and an exterior material 9 made of ceramic siding or the like is fixed to the ventilator rim 8. Yes. Thereby, by arranging the ventilation trunk edge 8 between the heat insulating material 7 and the exterior material 9, the ventilation layer 6 and the heat insulation material 7 and the exterior material 9 disposed outside (outdoor side) are provided. A gap is formed. This ventilation layer 6 is for adjusting humidity, and may be provided with an opening for taking in outside air and an opening for discharging the internal air.

  Further, the face material 4 in the outer wall structure of the present embodiment is constituted by two types of steel plates, a flat steel plate 4a and a corrugated steel plate 4b, instead of the conventional fiber reinforced cement plate. FIG. 2 is an exploded longitudinal sectional view showing the configuration of the face member 4 in the outer wall structure of the present embodiment, and FIG. 3 is an enlarged longitudinal sectional view showing a fixing portion of the face member 4. FIG. 4 is a view showing an attached state of the corrugated steel plate 4b. As shown in FIG. 2, a flat steel plate 4a is disposed on the heat insulating material 7 side, and a corrugated steel plate 4b is disposed on the frame side. Then, as shown in FIGS. 3 and 4, the corrugated steel plate 4b is formed by screwing a fastener 5a from its crest (a convex portion when viewed from the frame side), so that the frame stud 1 and It is fixed directly to the runner 2. On the other hand, the flat steel plate 4a is fixed to the stud 1 together with the heat insulating material 7 by a fastener 5b.

  As the steel plates 4a and 4b in the face material 4, a plated steel plate in which a plating layer made of Al, Zn or the like is formed on at least one surface can be used, and each of the steel plates 4a and 4b has a plating layer formed. Are arranged so that the opposite surfaces face each other. As a result, a space with a low surface emissivity is formed on the outdoor side of the frame (thin plate lightweight section steel) constituted by the stud 1 and the runner 2, so that the thin sheet lightweight section steel (stud 1, runner 2) during an outdoor fire. ) Temperature rise can be suppressed. Furthermore, because the surface of the frame side of the corrugated steel sheet has a low surface emissivity, the amount of heat radiation to the frame side is also reduced, and as a result, the 1-hour fire resistance is compared with the conventional outer wall structure. In this case, the temperature environment at the time of fire of the structural member can be lowered, and the structural safety at the time of fire can be further improved.

  In the outer wall structure of the present embodiment, it is desirable that the surface emissivity of the surface facing the gap 10 formed by the steel plates 4a and 4b constituting the face material 4 is 0.6 or less. Thereby, fireproof performance can be improved further. The surface emissivity here is a value measured by the method defined in JIS A 1423. As a method of making the surface emissivity of the surface facing the gap 10 to be 0.6 or less, for example, a plated steel plate in which aluminum is condensed to the surface layer is used, or a plated steel plate whose surface is polished to increase brightness is used. There are ways to do it.

  Further, as the corrugated steel plate 4b, a folded steel plate, a square wave steel plate, a large wave steel plate and the like can be used. Further, the plate thickness affects the structural strength rather than the fireproof performance, and is generally about 0.4 mm to 1.6 mm, but can be appropriately set according to the required structural strength. it can. On the other hand, the thickness of the flat steel plate 4a is thinner than the corrugated steel plate 4b, and is about 0.2 mm to 0.6 mm, for example. Furthermore, although the crest and trough dimensions in the corrugated steel plate 4b are not particularly limited, the trough length (viewed from the frame side) is larger than the crest length (the width of the convex portion when viewed from the frame side). In this case, it is desirable that the width of the concave portion is larger. Thereby, since the installation area to the frame material of the face material 4 becomes small, heat input can be made small.

  1 to 4 show the corrugated steel plate 4b that is horizontally bonded (the wave arrangement direction is the longitudinal direction), but the present invention is not limited to this, and the corrugation The mounting direction of the formed steel plate 4b may be either vertical bonding (the wave arrangement direction is the horizontal direction) or horizontal bonding. FIG. 5A is a view showing a state in which the corrugated steel plate 4b is vertically attached, and FIG. 5B is a longitudinal sectional view showing a configuration of a face material in which the corrugated steel plate 4b is vertically attached. . . As shown in FIGS. 5 (a) and 5 (b), the same effect can be obtained in the face material 14 in which the corrugated steel plate 4b is vertically attached, and further, the gap 11 formed by the steel plates 4a and 4b is obtained. By setting the surface emissivity of the facing surface to 0.6 or less, excellent fireproof performance can be obtained. However, when higher structural strength is required, the corrugated steel plate 4b is desirably pasted horizontally.

  As described above, in the outer wall structure of the present embodiment, the face material disposed between the heat insulating material and the thin lightweight steel (stud 1, runner 2) is replaced with a conventional fiber reinforced cement plate, and is flat. Since it is composed of two types of steel plate, the steel plate 4a and the corrugated steel plate 4b, the quality as a thin and light-weight steel wall panel is stable, and not only the structural strength but also the targeted fire and fire resistance performance. It can be demonstrated stably. Moreover, since the face material 4 of this embodiment is lighter than the conventional fiber reinforced cement board, the handling performance at the time of construction improves. Furthermore, a layer with low surface emissivity is formed on the outdoor side of the thin lightweight steel (stud 1, runner 2), and the temperature rise of the thin lightweight steel in the outdoor fire is suppressed, so compared with the conventional outer wall structure Fireproof performance is improved, and structural safety during a fire can be further increased.

  In the present embodiment, the case where the above-described face material 4 is applied to an outer wall structure made of thin lightweight steel is described. However, the present invention is not limited to this, and the roof of the thin lightweight steel. The same effect can be obtained even when applied to a structure. In that case, a roof covering material such as a base plate or a metal folding plate is provided on the surface of the heat insulating material 7 on the outdoor side, and a roof covering material is provided on the base plate via a ventilation trunk edge 8. That is, a ventilation layer is formed between the field board and the roofing material.

Hereinafter, the effects of the present invention will be specifically described with reference to examples of the present invention and comparative examples that are out of the scope of the present invention. In this example, the 1-hour fire resistance performance test defined in the test work method document possessed by the designated performance evaluation organization established by the government was conducted on the outer wall structure in which the face material 4 shown in FIGS. The condition at that time is first that the furnace temperature is heated so that the time lapse of time becomes a numerical value represented by the following formula (maximum 945 ° C.).
T = log ₁₀ (8t + 1) +20
Where T is the average furnace temperature (° C.) and t is the elapsed time (minutes).
Next, since the outer wall always supports a vertical load, the outer wall is loaded so that a stress corresponding to the long-term allowable stress is generated on the stud cross section of the thin lightweight steel as a structural member. Under such conditions, finally, in principle, the sample is loaded and heated for 60 minutes, followed by follow-up observation for 180 minutes, and it is confirmed that the specimen is not damaged such as buckling.
In addition, as a comparative example, a fire resistance performance test for 1 hour was performed on a conventional outer wall structure using a fiber-reinforced cement board as a face material under the same conditions as in the examples of the present invention. FIG. 3 is a graph showing the results of a one-hour fire resistance performance test of the outer wall structures of the examples of the present invention and the comparative example, with the test time on the horizontal axis and the temperature on the vertical axis. As shown in FIG. 6, in the case of the outer wall structure of the example of the present invention, it was confirmed that the temperature was 400 degrees after 75 minutes, and that the transition was lower than 10% from the comparative example of 500 degrees. Further, in the case of the structure of the present invention, it was confirmed that the specimen was not damaged, such as buckling, even if it was loaded and heated for 60 minutes and then followed up for 180 minutes as in the comparative example.

It is a cross-sectional view showing an outer wall structure according to an embodiment of the present invention. FIG. 3 is an exploded longitudinal sectional view showing a configuration of a face material 4. 3 is an enlarged vertical sectional view showing a fixing portion of a face material 4. FIG. It is a figure which shows the attachment state of the corrugated steel plate 4b. (A) is a figure which shows the state which bonded vertically the corrugated steel plate 4b, (b) is a longitudinal cross-sectional view which shows the structure of the face material which vertically bonded the corrugated steel plate 4b. It is a graph which shows a 1 hour fire resistance performance test result of an outer wall structure of an example and a comparative example, taking a test time on the horizontal axis and a temperature on the horizontal axis.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stud 1a, 1b Flange 2 Runner 3 Interior material 4,14 Face material 4a, 4b Steel plate 5a, 5b Fastener 6 Ventilation layer 7 Heat insulation material 8 Venting trunk edge 9 Exterior material 10, 11 Space | gap

Claims (10)

It is an outer wall structure of an outer heat insulating system in which a heat insulating material is disposed between a frame material made of thin lightweight steel and an outer material,
A face material is provided between the heat insulating material and the frame material, and a gap serving as a ventilation layer is formed between the heat insulating material and the exterior material by disposing a ventilation trunk edge,
The face material has a flat steel plate plated on at least one surface and a corrugated steel plate plated on at least one surface, the flat steel plate and the corrugated steel A low radiation space is formed by overlapping the steel plates so that the surfaces subjected to the plating treatment face each other, and the corrugated convex portion and the corrugated concave portion in the corrugated steel plate are in a substantially vertical direction. An outer wall structure characterized by alternating series.   The outer wall structure according to claim 1, wherein the corrugated steel sheet is also plated to give low radiation performance.   The said face material is characterized in that the flat steel plate is disposed between a heat insulating material and a corrugated steel plate, and the corrugated steel plate is disposed on the frame material side. The outer wall structure described.   As the face material, a plated steel plate in which aluminum is condensed into a surface layer is used, and a surface emissivity of a surface facing a void formed by the flat plate steel plate and the corrugated steel plate is 0.6 or less. The outer wall structure according to claim 1 or 2, characterized by the above. The heat insulating material is formed by foaming plastics, in front Kigaiso material and openings are provided for discharging the air inside the ventilation layer and the opening for introducing outside air into the ventilation layer The outer wall structure according to any one of claims 1 to 3, wherein the outer wall structure is provided. It is a roof structure of an external insulation system in which a heat insulating material is arranged between a frame material made of thin lightweight steel and a roof covering material,
A face material is provided between the heat insulating material and the frame material, and a gap serving as a ventilation layer is formed between the heat insulating material and the roof covering material by disposing a ventilation trunk edge,
The face material has a flat steel plate plated on at least one surface and a corrugated steel plate plated on at least one surface, the flat steel plate and the corrugated steel A low radiation space is formed by overlapping the steel plates so that the surfaces subjected to the plating treatment face each other, and the corrugated convex portion and the corrugated concave portion in the corrugated steel plate are in a substantially vertical direction. A roof structure characterized by alternating series.   The roof structure according to claim 6, wherein the corrugated steel sheet is also plated to give low radiation performance.   7. The face material according to claim 6, wherein the flat steel plate is disposed between the heat insulating material and the corrugated steel plate, and the corrugated steel plate is disposed on the frame material side. The described roof structure.   As the face material, a plated steel plate in which aluminum is condensed into a surface layer is used, and a surface emissivity of a surface facing a void formed by the flat plate steel plate and the corrugated steel plate is 0.6 or less. The roof structure according to any one of claims 6 to 8, characterized in that: The heat insulating material is formed by foaming plastic, outside air into the on the surface of the outdoor side of the heat insulating material is provided sheathing or metal folding plates or the like of the roofing material, the vent layer before Symbol roofing material The roof structure according to any one of claims 6 to 8, wherein an opening for taking in air and an opening for exhausting air inside the ventilation layer are provided.

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