JP6940655B2 - Steel-framed outer wall fireproof structure - Google Patents

Description

The present invention relates to a steel-framed outer wall fire-resistant structure, and more particularly to a steel-framed outer wall fire-resistant structure.

Buildings with fire resistance are roughly classified into fireproof buildings and semi-fireproof buildings stipulated by the Building Standards Act, depending on the difference in fireproofness. In fireproof buildings, structures such as walls, columns, beams, and floors need to have predetermined fire resistance. For example, in the case of a fireproof building having a predetermined number of floors, the fireproof structure of the outer wall is required to have a one-hour fireproof performance (Building Standards Law Enforcement Ordinance Article 107).

Conventionally, as an outer wall of a fireproof building such as a wooden structure or a steel frame structure, a fireproof structure having a predetermined fire resistance performance has been proposed by using an outer wall material such as cement mortar or lightweight foam concrete. Patent Document 1 discloses a fireproof structure of an outer wall in which an iron net is attached to the outside of a phenol-based heat insulating material as a base material for cement mortar. Further, Patent Document 2 discloses a fireproof structure of an outer wall in which a plate on which joists are installed is used as a base material for lightweight foam concrete, and a flame-retardant / non-flammable agent is applied to the entire outside of the plate.

However, in general, cement mortar has a problem that it takes time and effort to construct. In addition, since cement mortar and lightweight foam concrete have low waterproofness, it is necessary to apply a waterproof coating to the outside of the outer wall.

Therefore, in recent years, there has been an increasing demand for ceramic siding as an outer wall material, which has excellent design and is easy to construct.

JP-A-2002-235386 JP-A-2007-332745

However, in order for the ceramic siding to have a one-hour fire resistance, a certain thickness is required. The thicker the ceramic siding, the higher the cost and the lower the ease of construction.

Therefore, using ceramic siding as the outer wall material and gypsum board as the base material, a fireproof structure of the outer wall having fire resistance for 1 hour is constructed.

However, since ceramic siding and gypsum board are hydrates, they may shrink due to flames. Therefore, when the ends of a plurality of ceramic sidings are butted as an outer wall and the ends of a plurality of gypsum boards are butted and arranged side by side as a base, the temperature of the butted portion tends to rise and the butted portion opens due to shrinkage. There is a risk.

The present invention has been made in view of the above points, and an object of the present invention is to provide a steel-framed fire-resistant structure in which the fire-resistant performance is not easily deteriorated even in the butt portion of the base material and the butt portion of the outer wall material. be.

The steel-framed outer wall fireproof structure according to the present invention comprises a plurality of vertically long lightweight steel frames, a first gypsum board rectangular in front view and a second rectangular gypsum board in front view on the surface of the lightweight steel frame. And the rectangular outer wall material in the front view are provided in this order. The first gypsum board and the second gypsum board have the same size and a thickness of 15 mm. The first gypsum board is fixed to the surface of the lightweight steel frame by a fixing member so that two vertical sides are located on the lightweight steel frame which is the vertical furring strip. The second gypsum board is said to be on the surface of the first gypsum board so that the two vertical sides are located on the lightweight steel frame different from the lightweight steel frame on which the vertical sides of the first gypsum board are located. It is fixed to the lightweight steel frame by the fixing member via the first gypsum board. The two lateral sides of the second gypsum board and the two lateral sides of the first gypsum board are positioned so as to be offset in the vertical direction. A moisture permeable waterproof sheet is provided on the entire surface of the second gypsum board. The outer wall material is constructed so that the two long sides are installed in the horizontally long direction and do not overlap the two side sides of the first gypsum board and the two side sides of the second gypsum board in the thickness direction. It is fixed to the lightweight steel frame by a fastener via a first gypsum board and the second gypsum board. The back surface temperature of the first gypsum board 75 minutes after the start of heating when heating from the outer wall material side according to the standard heating curve defined in ISO834 does not exceed 271 ° C.

In the steel-framed outer wall fireproof structure, it is preferable that the first gypsum board and the second gypsum board are both reinforced gypsum boards that have been waterproofed with a water-repellent material.

In the steel-framed outer wall fireproof structure, the length of the vertical side of the first gypsum board and the length of the vertical side of the second gypsum board are the lengths of the short sides of the outer wall material, respectively. The lateral side of the second gypsum board and the lateral side of the first gypsum board are displaced in the vertical direction by the same length as the short side of the outer wall material. The two long sides of the outer wall material are located substantially at the center between the side surface of the first gypsum board and the side surface of the second gypsum board in the vertical direction. Is preferable.

In the steel-framed outer wall fireproof structure, aluminum tape is provided over substantially the entire length at the abutting portion of the surface of the first gypsum board which is butted up and down and adjacent to each other, and the back surface temperature does not exceed 126 ° C. Is preferable.

According to the present invention, it is possible to prevent the fire resistance from deteriorating even at the butt portion of the base material and the butt portion of the outer wall material.

It is a perspective view which shows an example of the steel-framed outer wall fireproof structure of 1st Embodiment of this invention. It is a top view of the steel-framed outer wall fireproof structure of FIG. FIG. 5 is a cross-sectional view taken along line XX of the steel-framed outer wall fireproof structure of FIG. It is a front view which shows an example of the construction process of the steel-framed outer wall fireproof structure of FIG. It is a front view which shows an example of the construction process of the steel-framed outer wall fireproof structure of FIG. It is a front view which shows an example of the construction process of the steel-framed outer wall fireproof structure of FIG. It is a front view which shows an example of the construction process of the steel-framed outer wall fireproof structure of FIG. FIG. 8A is a front view showing an example of the fastener used in the present invention, and FIG. 8B is a cross-sectional view showing an example of a steel-framed fireproof structure using the fastener of FIG. 8A. It is a front view which shows an example of the construction process of the steel-framed outer wall fireproof structure of the 2nd Embodiment of this invention. It is sectional drawing which shows an example of the steel-framed outer wall fireproof structure of the 2nd Embodiment of this invention. It is sectional drawing which shows an example of the steel-framed outer wall fireproof structure of 3rd Embodiment of this invention. 12A and 12B are perspective views showing a plurality of examples of the metal auxiliary material used in the present invention. It is sectional drawing which shows an example of the steel-framed outer wall fireproof structure of 3rd Embodiment of this invention. It is a perspective view which shows an example of the support member used in this invention. It is a top view which shows an example of the outer wall fireproof structure of the steel frame structure which concerns on this invention provided on a column. It is a top view which shows an example of the outer wall fireproof structure of the steel frame structure which concerns on this invention provided in the protruding corner. It is sectional drawing which shows an example of the outer wall fireproof structure of the steel frame structure which concerns on this invention provided on a beam. It is a perspective view which shows another example of the steel-framed outer wall fireproof structure of 1st Embodiment of this invention. 19A to 19C show modified examples of the support member used in the present invention. 19A is a perspective view of the support member, FIG. 19B is a front view of the support member, and FIG. 19C is a bottom view. It is sectional drawing which shows the modification of the steel-framed outer wall fireproof structure of 3rd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described.
(First Embodiment)
1 to 3 show an example of a steel-framed fireproof structure according to the first embodiment. The steel-framed outer wall fireproof structure of the first embodiment includes a plurality of vertically long lightweight steel frames 1, a first gypsum board 2 rectangular in front view on the surface of the lightweight steel frame 1, and a rectangular first gypsum board 2 in front view. The gypsum board 3 of 2 and the rectangular outer wall material 5 when viewed from the front are provided in this order. The surface means the outer surface of a steel-framed fireproof structure. Further, the front view means that the fireproof structure of the steel frame is viewed from the surface side in the thickness direction.

The lightweight steel frame 1 is a long furring strip. The cross-sectional shape of the lightweight steel frame 1 may be, for example, a rectangular shape such as a square pipe, or a C shape as shown in FIG. The cross section of the lightweight steel frame 1 means a cross section in a direction perpendicular to the long direction. The lightweight steel frame 1 may be formed from one furring strip, or a plurality of furring strips may be combined to form one lightweight steel frame 1. In the first embodiment, the lightweight steel frame 1 is installed on the surface of the foundation material as a vertical furring strip that is vertically long, that is, vertically long. The lightweight steel frames 1 are arranged side by side in the left-right direction at predetermined intervals. The intervals at which the lightweight steel frames 1 are installed are appropriately set, and may be evenly spaced as shown in FIG. 2, for example. The lightweight steel frame 1 includes the positions where the vertical sides 25 and 26 of the first gypsum board 2, the vertical sides 35 and 36 of the second gypsum board 3, and the short sides 55 and 56 of the outer wall material 5 are arranged, and the outer wall. It is installed at a position where the fastener 6 that supports the material 5 is arranged. In the present specification, the vertical direction or the vertical direction means the vertical direction, and the horizontal direction or the horizontal direction means the horizontal direction. That is, the vertical side means the side in the vertical direction, and the horizontal side means the side in the horizontal direction. Further, the thickness direction means the thickness direction of the first and second gypsum boards and the outer wall material.

The first gypsum board 2 and the second gypsum board 3 are rectangular gypsum boards when viewed from the front. Examples of gypsum board include reinforced gypsum board specified in JIS A 6901. Furthermore, it is preferable that the gypsum in the core of the reinforced gypsum board is waterproofed with a water-repellent material or the like to prevent the strength and durability of the reinforced gypsum board from being lowered by rainwater or humidity. Can be done. The thickness of the first gypsum board 2 and the second gypsum board 3 is selected according to the required fire resistance, and is in the range of, for example, 15 to 27 mm. The sizes of the first gypsum board 2 and the second gypsum board 3 are not particularly limited, but for example, the short side is in the range of 600 to 1220 mm and the long side is in the range of 1200 to 3030 mm. In FIG. 1, the first gypsum board 2 and the second gypsum board 3 are arranged so that the vertical side is the short side and the horizontal side is the long side, but the arrangement is not limited to this. As shown in FIG. 18, both the first gypsum board 2 and the second gypsum board 3 may be arranged so that the vertical side is the long side and the horizontal side is the short side. Alternatively, the vertical side of either the first gypsum board 2 or the second gypsum board 3 is the long side and the horizontal side are the short sides (that is, the construction in the horizontally long direction), and the other vertical side is the short side and the horizontal side. The sides may be arranged so as to be long sides (that is, construction in the vertically long direction). The size of the first gypsum board 2 and the second gypsum board 3 means the size in front view.

It is preferable that the first gypsum board 2 and the second gypsum board 3 have the same size. In FIG. 1, the vertical sides 25 and 26 of the first gypsum board 2 and the vertical sides 35 and 36 of the second gypsum board 3 have the same length, and the horizontal sides 27 and 28 and the first gypsum board 2 of the first gypsum board 2 have the same length. The lateral sides 37 and 38 of the gypsum board 3 of 2 have the same length. The size of the first gypsum board 2 and the second gypsum board 3 are the same, and the directions of the long side and the short side of the first gypsum board 2 and the second gypsum board 3 are the same. In this case, the lateral side of the first gypsum board 2, the lateral side of the second gypsum board 3, and the long side of the outer wall material 5 can be easily constructed so as not to overlap in the thickness direction. The sizes of the first gypsum board 2 and the second gypsum board 3 may be different. Further, the thicknesses of the first gypsum board 2 and the second gypsum board 3 may be the same or different.

It is preferable that the moisture permeable waterproof sheet 4 is provided on the surface side of the second gypsum board 3. The moisture permeable waterproof sheet 4 has a property of preventing the ingress of moisture and allowing moisture (water vapor) to permeate. The moisture permeable waterproof sheet 4 releases moisture to the surface side, and the occurrence of dew condensation in the fireproof structure is easily suppressed. Further, even when water such as rainwater infiltrates from the outer wall material 5, it becomes easy to prevent the infiltration of water into the second gypsum board 3 side. The moisture permeable waterproof sheet 4 may be provided on the entire surface of the second gypsum board 3.

The outer wall material 5 is a rectangular ceramic siding when viewed from the front. The size and thickness of the ceramic siding are appropriately set, and for example, the short side is in the range of 300 to 1000 mm, the long side is in the range of 1000 to 3600 mm, and the thickness is in the range of 12 to 40 mm.

4 to 7 show an example of a construction process of the steel-framed outer wall fireproof structure of the first embodiment. FIG. 4 is an example of the construction structure of the first gypsum board 2 of the first embodiment. In the first embodiment, the first gypsum board 2 is installed over a plurality of lightweight steel frames 1. The two vertical sides 25 and 26 of the first gypsum board 2 are located on the lightweight steel frame 1. In the present specification, the lightweight steel frame 1 in which the vertical sides 25 and 26 of the first gypsum board 2 are located is also referred to as the first lightweight steel frame 11. When a plurality of first gypsum boards 2 are installed side by side in the vertical and horizontal directions, the vertical sides 25 and 26 of all the first gypsum boards 2 are located on the lightweight steel frame 1. The first gypsum board 2 is fixed to the lightweight steel frame 1 by a fixing member. Examples of the fixing member include screws, nails, and screws.

As shown in FIG. 4, when a plurality of first gypsum boards 2 are adjacent to each other in the vertical direction, the side surfaces of the first gypsum boards 2 are butted against each other and are adjacent to each other. The portion where the lateral sides of the first gypsum board 2 are butted against each other is the butted portion 7. That is, as shown in FIG. 4, the lower side 281 of the upper first gypsum board 21 and the upper side 272 of the lower first gypsum board 22 are butted against each other.

Further, as shown in FIG. 4, when a plurality of first gypsum boards 2 are adjacent to each other in the left-right direction, the vertical sides of the first gypsum boards 2 are butted against each other and are adjacent to each other. The portion where the vertical sides of the first gypsum board 2 are butted against each other is the butted portion 8. That is, as shown in FIG. 4, the left vertical side 263 of the first right gypsum board 23 and the right vertical side 254 of the left first gypsum board 24 are butted against each other.

FIG. 5 shows an example of the construction structure of the second gypsum board 3 of the first embodiment. In the first embodiment, the second gypsum board 3 is installed on the surface of the first gypsum board 2 over a plurality of lightweight steel frames 1. The two vertical sides 35 and 36 of the second gypsum board 3 are located in a lightweight steel frame 1 different from the lightweight steel frame 1 in which the vertical sides 25 and 26 of the first gypsum board 2 are located. In the present specification, the lightweight steel frame 1 in which the vertical sides 35 and 36 of the second gypsum board 3 are located is also referred to as a second lightweight steel frame 12. As shown in FIG. 5, when a plurality of second gypsum boards 3 are installed side by side in the vertical and horizontal directions, the vertical sides 35 and 36 of all the second gypsum boards 3 are different from the first lightweight steel frame 11. Located in a different lightweight steel frame 1. The second gypsum board 3 is fixed to the lightweight steel frame 1 by a fixing member via the first gypsum board 2. Examples of the fixing member include screws, nails, and screws.

As shown in FIG. 5, when a plurality of second gypsum boards 3 are adjacent to each other in the vertical direction, the side surfaces of the second gypsum boards 3 are butted against each other and are adjacent to each other. The portion where the lateral sides of the second gypsum board 3 are butted against each other is the butted portion 9. That is, as shown in FIG. 5, the lower side 381 of the upper second gypsum board 31 and the upper side 372 of the lower second gypsum board 32 are butted against each other.

Further, as shown in FIG. 5, when a plurality of second gypsum boards 3 are adjacent to each other in the left-right direction, the vertical sides of the second gypsum boards 3 are butted against each other and are adjacent to each other. The portion where the vertical sides of the second gypsum board 3 are butted against each other is the butted portion 10. That is, as shown in FIG. 5, the left vertical side 363 of the right second gypsum board 33 and the right vertical side 354 of the left second gypsum board 34 are butted against each other.

The two lateral sides 37 and 38 of the second gypsum board 3 and the two lateral sides 27 and 28 of the first gypsum board 2 are positioned so as to be offset in the vertical direction. That is, the closest lateral sides of the first gypsum board 2 and the second gypsum board 3 do not overlap in the thickness direction and are located apart in the vertical direction. As shown in FIG. 5, when a plurality of second gypsum boards 3 are adjacent to each other in the vertical direction, the abutting portion 9 between the lateral sides of the second gypsum board 3 and the first gypsum, which are closest to each other, and the first gypsum. The abutting portion 7 between the lateral sides of the board 2 is positioned so as to be displaced in the vertical direction. The abutting portion 9 between the lateral sides of the second gypsum board 3 and the abutting portion 7 between the lateral sides of the first gypsum board 2 do not overlap in the thickness direction, so that the second gypsum in the event of a fire Even when the board 3 contracts and a gap is formed in the abutting portion 9 between the lateral sides of the second gypsum board 3, the back surface side of the abutting portion 9 between the lateral sides of the second gypsum board 3 Since the first gypsum board 2 is present, the fire resistance performance is less likely to deteriorate.

The vertical distance between the closest lateral sides of the first gypsum board 2 and the second gypsum board 3 is set as appropriate. For example, when the lengths of the vertical sides of the first gypsum board 2 and the second gypsum board 3 are the same, the vertical direction of the closest horizontal sides of the first gypsum board 2 and the second gypsum board 3 The distance can be halved from the lengths of the vertical sides 25 and 26 of the first gypsum board 2. The distance between the abutting portion 9 between the lateral sides of the second gypsum board 3 and the abutting portion 7 between the lateral sides of the first gypsum board 2 is the length of the vertical sides 25 and 26 of the first gypsum board 2. If the length is about 1/2 of that, the abutting portions 7 and 9 between the side surfaces of the gypsum boards 2 and 3 are present at equal intervals. It is easy to select the size of the outer wall material 5 and arrange the outer wall material 5 so that the abutting portions 7 and 9 of the gypsum boards 2 and 3 do not overlap with each other.

As shown in FIG. 6, the joiner 14 is arranged at a predetermined position on the surface side of the second gypsum board 3 so as to overlap the abutting portion 16 between the short sides of the outer wall material 5, and is fixed to the lightweight steel frame 1. Examples of the joiner 14 include a hat-type joiner.

Further, the fastener 6 is fixed at a predetermined position on the surface of the second gypsum board 3 so as to overlap the abutting portion 15 between the long sides of the outer wall material 5. The fastener 6 is fixed to the lightweight steel frame 1 by a fixing member. Examples of the fixing member include screws, nails, and screws, and a plurality of types may be used in combination. The shape and size of the fastener 6 are appropriately selected.

FIG. 8A shows an example of the fastener 6. The fastener 6 of FIG. 8A includes a fixing portion 61 for fixing the fastener 6 itself in contact with the second gypsum board 3, a holding portion 62 for holding the outer wall material 5, and a protruding piece 63. .. When the fastener 6 is used, in the fixing portion 61, the upper end portion on the outer wall material 5 side is referred to as the upper end portion 61a, and the lower end portion on the lower outer wall material 5 side is referred to as the lower end portion 61b.

The fixing portion 61 is provided with a fixing hole 610 for inserting the fixing member. The holding portion 62 is composed of a first piece 621, a second piece 622, and a third piece 623. The first piece 621 is provided so as to project forward from substantially the center of the fixing portion 61 in the vertical direction. The second piece 622 is provided so as to project from the front end of the first piece 621 toward the upper end portion 61a side of the fixing portion 61, and supports the upper outer wall material 5 attached to the front side of the upper end portion 61a. In FIG. 8A, the second piece 622 is continuously provided over substantially the entire length of the first piece 621 in the left-right direction without being divided. The second piece 622 may be provided in a divided manner. The third piece 623 is provided so as to project from the front end of the first piece 621 toward the lower end portion 61b side of the fixing portion 61, and supports the lower outer wall material 5 attached to the front side of the lower end portion 61b. In FIG. 8A, the third piece 623 is divided into two pieces, but it may be provided continuously like the second piece 622. The vertical direction and the horizontal direction of the fastener 6 mean the vertical direction and the horizontal direction of the fastener 6 in the front view of the steel-framed outer wall fireproof structure when the fastener 6 is used.

The projecting piece 63 is provided so as to project forward from both left and right ends of the fixing portion 61 so as to have a length shorter than the projecting length of the first piece 621. The projecting piece 63 can form a ventilation space between the outer wall material 5 and the second gypsum board 3 as shown in FIG. 8B. The projecting piece 63 may have an inward-facing piece 631 and an outward-facing piece 632 that project to the left and right from the front end.

The inward-facing piece 631 is provided so as to extend from the front end of the projecting piece 63 substantially parallel to the fixing portion 61 and inside the fixing portion 61. In the protruding piece 63, the inward-facing piece 631 is provided on the lower end portion 61b side of the fixed portion 61 with respect to the first piece 621, and the upper end edge of the inward-facing piece 631 provided on the protruding pieces 63 on both the left and right sides is the first piece 621. The first piece 621 is supported in contact with the lower surface of the. In this way, by supporting the first piece 621 with the inward-facing piece 631 that is substantially perpendicular to the first piece 621, the first piece 621 is less likely to be deformed. The outward piece 632 is provided so as to extend from the front end of the projecting piece 63 substantially parallel to the fixing portion 61 and to the outside of the fixing portion 61. The outward piece 632 can further suppress the deformation of the protruding piece 63.

The fastener 6 can be obtained by appropriately cutting or bending a metal plate such as a steel plate. The first piece 621, the second piece 622, the third piece 623, the protruding piece 63, the inward piece 631, and the outward piece 632 can be formed by cutting and raising a part of the fixing portion 61.

In FIG. 8A, the vertical length and the horizontal length of the fastener 6 are substantially the same, but are not limited to this. The length of the fastener 6 in the left-right direction is appropriately set, but it is preferably substantially the same as the length of the long sides 57 and 58 of the outer wall material 5. Approximately the same means that they do not have to be exactly the same, but may be slightly shorter. For example, the fastener 6 may be shorter than the long sides 57, 58 of the outer wall material 5 so as not to overlap the joiner 14. If the fastener 6 is long in the left-right direction, the fastener 6 can be easily installed, and the outer wall material 5 can be more easily supported by the fastener 6. When the fastener 6 is long, the fixing holes 610 may be appropriately provided according to the arrangement interval of the lightweight steel frame 1.

Further, in FIG. 6, six fasteners 6 are used to fix one outer wall material 5, but the number of fasteners 6 is appropriately set according to the shape of the fasteners 6 and the like. .. As the fasteners 6, a plurality of fasteners 6 having a left-right length shorter than half the length of the long side of the outer wall material 5 may be arranged.

FIG. 7 shows an example of the construction structure of the outer wall material 5 of the first embodiment. In the first embodiment, the outer wall material 5 is constructed in the horizontally long direction. That is, the outer wall material 5 is arranged so that the vertical side is the short side and the horizontal side is the long side. The outer wall material 5 is installed on the surface of the second gypsum board 3 via the fastener 6 and the joiner 14 over the plurality of lightweight steel frames 1. The two short sides 55 and 56 of the outer wall material 5 are located on the lightweight steel frame 1. The lightweight steel frame 1 to which the outer wall material 5 is fixed may be the same as or different from the first lightweight steel frame 11 or the second lightweight steel frame 12. When a plurality of outer wall materials 5 are installed side by side in the vertical and horizontal directions as shown in FIG. 7, the short sides 55 and 56 of all the outer wall materials 5 are in contact with the joiner 14 and are located in the lightweight steel frame 1. The outer wall material 5 is fixed to the lightweight steel frame 1 by the fastener 6 via the first gypsum board 2 and the second gypsum board 3.

As shown in FIG. 7, when a plurality of outer wall materials 5 are adjacent to each other in the vertical direction, the outer wall materials 5 are adjacent to each other with their lateral sides abutted with each other via the fastener 6. The portion where the long sides of the outer wall material 5 are butted against each other is the butted portion 15. That is, as shown in FIG. 7, the lower horizontal side 581 of the upper outer wall material 51 and the upper horizontal side 572 of the lower outer wall material 52 are butted with each other via the fastener 6.

Further, as shown in FIG. 7, when a plurality of outer wall materials 5 are adjacent to each other in the left-right direction, the vertical sides of the outer wall materials 5 are butted against each other via the joiner 14 and are adjacent to each other. The portion where the short sides of the outer wall material 5 are butted against each other is the butted portion 16. That is, as shown in FIG. 7, the left short side 563 of the right outer wall material 53 and the right short side 554 of the left outer wall material 54 are butted against each other. It is preferable that the abutting portion 16 between the short sides of the outer wall material 5 is filled with a sealing material 17 in order to close the gap. Examples of the sealing material 17 include a silicone-based resin.

As shown in FIG. 7, the two long sides 57 and 58 of the outer wall material 5 constructed in the horizontally long direction are the two horizontal sides 27 and 28 of the first gypsum board 2 and the two lateral sides of the second gypsum board 3. It is arranged so as not to overlap with the sides 37 and 38 in the thickness direction. The positions of the two short sides 55 and 56 of the outer wall material 5 are the two vertical sides 25 and 26 of the first gypsum board 2 and the two vertical sides 35 and 36 of the second gypsum board 3 in the thickness direction. It may or may not match.

As shown in FIG. 7, when a plurality of outer wall materials 5 are adjacent to each other in the vertical direction, the abutting portion 15 between the long sides of the outer wall material 5 and the abutting portion 7 between the side sides of the first gypsum board 2 It does not overlap with the abutting portion 9 between the lateral sides of the second gypsum board 3. As a result, even if the outer wall material 5 contracts in the event of a fire and a gap is formed in the butt portion 15 between the long sides of the outer wall material 5, the butt portion 15 between the long sides of the outer wall material 5 Since the second gypsum board 3 is present on the back surface side, the fire resistance performance is less likely to deteriorate.

The length of the vertical side of the first gypsum board 2 and the second gypsum board 3 is preferably twice the length of the short side of the outer wall material 5. Further, it is preferable that the lateral side of the second gypsum board 3 and the lateral side of the first gypsum board 2 are positioned in the vertical direction with the same length as the short side of the outer wall material 5. .. The same length does not have to be exactly the same, but includes the meaning that they are approximately the same. As a result, the abutting portion 15 between the long sides of the outer wall material 5, the abutting portion 7 between the lateral sides of the first gypsum board 2, and the abutting portion 9 between the lateral sides of the second gypsum board 3 are heavy. It can be easily arranged so that it does not become. It is more preferable that the two long sides of the outer wall material 5 are located substantially at the center between the side surface of the first gypsum board 2 and the side surface of the second gypsum board 3 in the vertical direction. Approximately the center does not have to be the center (middle) in a strict sense, and includes the meaning that it may be slightly shifted up and down. For example, when Sabroku boards (sizes 3 shaku x 6 shaku, 910 x 1820 mm) are used as the first gypsum board 2 and the second gypsum board 3, they are provided in the horizontally long direction and vertically sideways. It can be arranged with a deviation of 1/2 of the size, that is, 1.5 shaku. Then, an outer wall material 5 having a size of 1.5 shaku x 10 shaku (455 x 3030 mm) is used and provided in the horizontally long direction, and the long side of the outer wall material 5 is provided on the side and the first side of the first gypsum board 2. It can be located substantially in the center between the side surface of the gypsum board 3 and the vertical direction of 2. In this case, the lateral side of the first gypsum board 2, the lateral side of the second gypsum board 3, and the long side of the outer wall material 5 are likely to be arranged so as not to overlap in the thickness direction. The lateral side of the gypsum board 2, the lateral side of the second gypsum board 3, and the long side of the outer wall material 5 are arranged so as to be separated by about 0.75 inch.

As shown in FIG. 15, the steel-framed outer wall fireproof structure as described above can be used as the fireproof structure of the outer wall of the column portion. In FIG. 15, a plurality of vertically long lightweight steel frames 1 are installed on the base 107. A lath base 101 is provided between the pillar 100 of the square steel pipe and the first gypsum board 2. It is preferable that the outer surfaces of the pillar 100 and the lath base 101 are covered with the refractory material 102 by a method of spraying the refractory material or the like. Examples of the refractory material 102 include rock wool. A heat insulating layer 103 may be provided between the pillar 100 and the first gypsum board 2. Examples of the material of the heat insulating layer 103 include a rock wool board. The column 100 is not limited to the square steel pipe.

Further, as shown in FIG. 16, it can be used as a fireproof structure for the outer wall of the protruding corner portion. In FIG. 16, the same components as those in FIG. 15 are designated by the same reference numerals and the description thereof will be omitted. For the protruding corner portion, an L-shaped corner outer wall material 50 is used as the outer wall material. The corner outer wall material 50 is abutted with the outer wall materials 5 adjacent to each other in the left-right direction via the joiner 14. The corner outer wall material 50 is fixed to the second gypsum board 3 via the fastener 6. The lightweight steel frame 1 and the column 100 are connected and fixed by, for example, a plate 106.

Further, as shown in FIG. 17, it can be used as a fireproof structure for the outer wall of the beam portion. In FIG. 17, the same components as those in FIG. 15 are designated by the same reference numerals and the description thereof will be omitted. In FIG. 17, the floor plate 105 is provided on the beam 104 of the H-shaped steel. A lath base 101 is provided between the beam 104 and the first gypsum board 2 and between the floor board 105 and the first gypsum board 2. It is preferable that the outer surfaces of the beam 104 and the lath base 101 are covered with the refractory material 102 by a method of spraying the refractory material 102 or the like. The lightweight steel frame 1 and the beam 104 are connected and fixed by, for example, a plate 106. The beam 104 is not limited to the H-shaped steel.

(Second Embodiment)
9 and 10 show a part of the steel-framed outer wall fireproof structure of the second embodiment. In the second embodiment, the abutting portion 7 between the lateral sides of the first embodiment and the first gypsum board 2 is different, and other than that, the configuration is the same. That is, the steel-framed outer wall fireproof structure of the second embodiment has a plurality of lightweight steel frames 1 and a first gypsum board 2 that is rectangular in front view on the surface of the lightweight steel frame 1 as in the first embodiment. A second gypsum board 3 that is rectangular in front view and an outer wall material 5 that is rectangular in front view are provided in this order. The method of arranging the first gypsum board 2, the second gypsum board 3, and the outer wall material 5 is the same as that of the first embodiment. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. A moisture-permeable waterproof sheet 4 may be provided on the surface of the second gypsum board 3.

In the second embodiment, as shown in FIG. 9, a metal tape 18 is provided at the abutting portion 7 on the surface of the first gypsum boards 21 and 22 in which the lateral sides 281 and 272 are abutted and adjacent to each other. .. The metal tape 18 is provided so as to straddle the lower lateral side 281 of the upper gypsum board 21 and the upper lateral side 272 of the lower gypsum board 22 and cover the abutting portion 7 between the lateral sides. Is preferable. It is preferable that the metal tape 18 is provided at the abutting portion 7 between the lateral sides over substantially the entire length of the lateral sides 281 and 272 of the first gypsum boards 21 and 22. It is preferable that the metal tape 18 is provided over substantially the entire length in the left-right direction of the outer wall fireproof structure of the second embodiment. The substantially total length does not have to be the total length in a strict sense, and includes the meaning that it may be slightly longer or shorter. The width of the metal tape 18 is not particularly limited as long as the abutting portion 7 between the lateral sides of the first gypsum board 2 is covered.

Examples of the material of the metal tape 18 include aluminum and steel. As the metal tape 18, an aluminum tape is preferable. Among metals, aluminum has a relatively high heat emissivity, so that heat is less likely to be transferred from the abutting portion 7 to the gypsum boards 2 and 3 in the event of a fire, which is preferable. Further, aluminum is preferable because it is relatively inexpensive among metals. Even if the first gypsum board 2 contracts in the event of a fire and a gap is formed in the abutting portion 7 between the side surfaces, the gap is covered by the metal tape 18, so that the fire resistance performance is high. Is less likely to decrease. Further, the metal tape 18 may also be provided on the abutting portion 8 between the vertical sides of the first gypsum board 2, which further improves the fire resistance performance. Since the lightweight steel frame 1 is present on the back surface side of the abutting portion 8 between the vertical sides of the first gypsum board 2, the metal tape 18 may not be provided.

The thickness of the first gypsum board 2 and the second gypsum board 3 shown in FIG. 10 is in the range of 15 to 27 mm as described above. In the second embodiment, since the fire resistance is improved by providing the metal tape 18 at the butt portion 7 on the surface of the first gypsum boards 21 and 22, for example, the first gypsum board 2 and the second embodiment. The thickness of the gypsum board 3 of 2 may be 15 mm. Even in this case, sufficient fire resistance can be ensured. Further, when the thickness of the first gypsum board 2 and the second gypsum board 3 is 15 mm, it is lighter than the gypsum board having a thickness larger than 15 mm. Therefore, the first gypsum board 2 and the second gypsum board 3 can be easily constructed.

Further, when the thickness of the first gypsum board 2 and the second gypsum board 3 is 15 mm, an aluminum tape is provided as a metal tape 18 at the butt portion 7 on the surface of the first gypsum boards 21 and 22. The fire-resistant performance of the fire-resistant structure was compared with the fire-resistant performance of the fire-resistant structure not provided with the metal tape 18. Specifically, according to the standard heating curve defined by ISO834, the two fireproof structures are heated from the outer wall material 5 side in the heating furnace, and 60 to 75 minutes have passed from the start of heating, the first gypsum board 2 The temperature of the back surface (the surface on the side where the lightweight steel frame 1 is provided) was measured. The results are shown in Table 1.

From Table 1, in the fireproof structure in which the metal tape 18 is not provided at the abutting portion 7 on the surface of the first gypsum boards 21 and 22, as the temperature in the furnace rises, the back surface of the first gypsum board 2 The temperature is rising sharply.

On the other hand, in the fireproof structure in which the metal tape 18 is provided at the abutting portion 7 on the surface of the first gypsum boards 21 and 22, even if the temperature inside the furnace rises, the back surface of the first gypsum board 2 The temperature has not risen sharply.

Further, if the thickness of the second gypsum board 3 is 15 mm or more, the aluminum tape provided at the butt portion 7 that originally melts at about 660 ° C. Even if the temperature inside exceeds 900 ° C, it does not melt.

That is, even when the thickness of both the first gypsum board 2 and the second gypsum board 3 is 15 mm, the metal tape 18 is provided at the butt portion 7 on the surface of the first gypsum boards 21 and 22. , The temperature rise on the back surface of the first gypsum board 2 can be reduced, and the butt portion 7 can be protected. As a result, the fire resistance of the fire resistant structure can be sufficiently ensured.

(Third Embodiment)
FIG. 11 shows the steel-framed outer wall fireproof structure of the third embodiment. The third embodiment and the first embodiment have different configurations between the second gypsum board 3 and the outer wall material 5, and are otherwise the same. That is, the steel-framed outer wall fireproof structure of the second embodiment has a plurality of lightweight steel frames 1 and a first gypsum board 2 that is rectangular in front view on the surface of the lightweight steel frame 1 as in the first embodiment. A second gypsum board 3 that is rectangular in front view and an outer wall material 5 that is rectangular in front view are provided in this order. The method of arranging the first gypsum board 2 and the second gypsum board 3 is the same as that of the first embodiment. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. A moisture-permeable waterproof sheet 4 may be provided on the surface of the second gypsum board 3.

In the third embodiment, as shown in FIG. 11, the side surfaces 381 and 372 are butted against each other and are adjacent to the surface of the second gypsum boards 31 and 32 in a substantially horizontal direction, that is, the second gypsum boards 31 and 32. A metal auxiliary material 19 is provided substantially parallel to the lateral sides 381 and 372 of the above. Approximately horizontal means that it does not have to be horizontal in the strict sense and may be slightly tilted. The metal auxiliary material 19 may be provided on the second gypsum board 3 via the moisture permeable waterproof sheet 4.

The metal auxiliary material 19 has at least a fixing portion 191. The fixing portion 191 is a portion for fixing the metal auxiliary material 19 itself to the second gypsum board 3. The fixing portion 191 may be appropriately provided with a fixing hole 190 for inserting the fixing member. The metal auxiliary material 19 can hold down the second gypsum board 3 from the surface side. By providing the metal auxiliary material 19 on the surface of the second gypsum board, the second gypsum board 3 can be pressed from the surface side, so that the second gypsum board 3 falls off or warps due to shrinkage during high heat. Is more likely to be suppressed, and the fire resistance of the steel-framed outer wall fire-resistant structure is further improved. The place where the metal auxiliary material 19 is provided is appropriately selected, and may be, for example, in the vicinity of the abutting portion 9 between the lateral sides of the surfaces of the second gypsum boards 31 and 32. Since the abutting portion 9 between the side surfaces of the second gypsum board 3 may shrink or warp at the time of ignition, the metal auxiliary material 19 suppresses the second gypsum board 3 from falling off. be able to. The size of the fixing portion 191 is appropriately set according to the size of the second gypsum board 3 and the outer wall material 5.

The metal auxiliary material 19 preferably includes a fixing portion 191 and a protruding portion 192, as shown in FIGS. 12A and 12B. The protruding portion 192 has a shape protruding forward from the fixed portion 191. The protrusion 192 can improve the strength of the metal auxiliary material 19, and by using such a metal auxiliary material 19, the second gypsum board 3 can be pressed more firmly. The protrusion height L of the protrusion 192 from the fixing portion 191 is equal to or less than the length between the second gypsum board 3 and the outer wall material 5, and may be the same or shorter. When the protrusion height L of the protrusion 192 from the fixing portion 191 is the same as the length between the second gypsum board 3 and the outer wall material 5, the front end portion 193 at the front of the protrusion 192 is the outer wall material. Contact with 5. In this case, the protruding portion 192 can hold the outer wall material 5 against a force in the thickness direction of the outer wall material 5 such as wind pressure, in addition to the effect of improving the strength of the metal auxiliary material 19. The cross-sectional shape of the protruding portion 192 of the metal auxiliary material 19 is appropriately selected, and is, for example, a C-shape having a corner or an L-shape.

Hereinafter, the metal auxiliary material 19 of FIGS. 12A and 12B will be described, but the shape of the metal auxiliary material 19 is not limited to the shapes of FIGS. 12A and 12B. The metal auxiliary material 19 is formed only from the fixing portion 191 and may have a flat plate shape. Further, as shown in FIGS. 12A and 12B, the metal auxiliary material 19 may have a protrusion 192 at the lower end of the fixing portion 191 or may have a protrusion 192 at the upper end of the fixing portion 191. A protruding portion 192 may be provided in the middle of the fixed portion 191 in the vertical direction. The vertical direction and the horizontal direction of the metal auxiliary material 19 mean the vertical direction and the horizontal direction of the metal auxiliary material 19 in the front view of the steel-framed outer wall fireproof structure when the metal auxiliary material 19 is used.

The metal auxiliary material 19 of FIG. 12A will be described. The protrusion 192 is composed of a first piece 195 and a second piece 196. The first piece 195 is provided so as to project forward from the lower end of the fixing portion 191. The angle between the fixed portion 191 and the first piece 195 may be larger than 90 degrees and less than 180 degrees, and is appropriately selected. The second piece 196 projects rearward from the front end of the first piece 195. The angle between the first piece 195 and the second piece 196 may be less than 180 degrees and is appropriately selected. The rear end of the second piece 196 is on an extension of the fixed portion 191. That is, the rear end of the second piece 196 is in contact with the second gypsum board 3. In FIG. 12A, the cross-sectional shape of the protruding portion 192 of the metal auxiliary material 19 is L-shaped, and the upper side 197, which is the joint between the first piece 195 and the second piece 196, is the front end portion 193 of the metal auxiliary material 19. Is. In FIG. 12A, the upper side 197 is in contact with the back surface of the outer wall material 5. The metal auxiliary material 19 may include an outward piece 194 extending parallel to the fixing portion 191 from the rear end of the second piece 196. The outward piece 194 makes it easier to suppress the deformation of the second piece 196.

Next, the metal auxiliary material 19 of FIG. 12B will be described. The protrusion 192 is composed of a first piece 198, a second piece 199, and a third piece 200. The first piece 198 is provided so as to project substantially vertically forward from the lower end of the fixing portion 191. The second piece 199 projects downward from the front end of the first piece 198 substantially parallel to the fixing portion 191. The third piece 200 projects substantially vertically rearward from the lower end of the second piece 199. The rear end of the third piece 200 exists on an extension line of the fixing portion 191. That is, the rear end of the third piece 200 is in contact with the second gypsum board 3. In FIG. 12B, the cross-sectional shape of the protruding portion 192 of the metal auxiliary material 19 is C-shaped, and the second piece 199 is the front end portion 193 of the metal auxiliary material 19. In FIG. 12B, the lengths of the first piece 198 and the third piece 200 are the same as the protrusion length L of the protrusion 192, and the second piece 199 is in contact with the back surface of the outer wall material 5. The metal auxiliary material 19 can be obtained by appropriately cutting or bending a metal plate such as a steel plate.

It is preferable that the metal auxiliary material 19 is provided over the entire horizontal length of the steel-framed outer wall fireproof structure of the present embodiment. As a result, the second gypsum board 3 can be pressed more firmly from the surface side. Further, it is preferable that the metal auxiliary material 19 is provided across a plurality of second gypsum boards 3 adjacent to each other in the left-right direction. Since the metal auxiliary material 19 is provided across the plurality of second gypsum boards 3, the plurality of second gypsum boards 3 are stably pressed from the surface side by the metal auxiliary material 19. Therefore, it becomes easy to prevent the second gypsum board 3 from falling off.

The length of the metal auxiliary material 19 in the left-right direction is appropriately set, but as shown in FIGS. 12A and 12B, the metal auxiliary material 19 is preferably long. When the long side of the outer wall material 5 is longer than that of the second gypsum board 3, the length of the metal auxiliary material 19 in the left-right direction is preferably longer than the lateral sides 37 and 38 of the second gypsum board 3, and the outer wall. It is more preferable that the length is the same as the lengths of the long sides 57 and 58 of the material 5. The term "same" does not have to be exactly the same, but may be slightly shorter, and includes the meaning that they are substantially the same. For example, in the present embodiment, since the outer wall material 5 is constructed via the joiner 14, the metal auxiliary material 19 is shorter than the long sides 57 and 58 of the outer wall material 5 so as not to overlap with the joiner 14. good. As the metal auxiliary material 19, a plurality of metal auxiliary materials 19 whose left and right lengths are shorter than 1/2 the length of the long side of the outer wall material 5 may be arranged.

The metal auxiliary material 19 is preferably a fastener 6. The fact that the metal auxiliary material 19 is the fastener 6 means that the metal auxiliary material 19 has a function of the fastener 6, that is, a function of locking and fixing the outer wall material 5. The fastener 6 and the metal auxiliary material 19 are preferably integrated. That is, it is preferable to use the support member 20 having the functions of both the fastener 6 and the metal auxiliary material 19. FIG. 14 shows an example of the support member 20. Further, FIG. 13 shows an example of a steel-framed outer wall fireproof structure using the support member 20. The support member 20 includes a fixing portion 201 for fixing the support member 20 itself to the second gypsum board 3, a first holding portion 202 for holding the outer wall material 5, and a second holding portion 203. .. The first holding portion 202 and the second holding portion 203 have a shape protruding forward from the fixing portion 201. The protruding height L of the second holding portion 203 from the fixing portion 201 is substantially the same as the length between the second gypsum board 3 and the outer wall material 5. As a result, a ventilation space can be formed between the outer wall material 5 and the second gypsum board 3.

In the support member 20, the first holding portion 202 and the second holding portion 203 play the role of the fastener 6, and the fixing portion 201 plays the role of the metal auxiliary material 19. That is, the outer wall material 5 is locked and fixed by the first holding portion 202 of the support member 20, a ventilation space is formed by the second holding portion 203, and the second gypsum board 3 is pressed from the surface side by the fixing portion 201. be able to. The sizes of the fixing portion 201, the first holding portion 202, and the second holding portion 203 are appropriately set according to the size and weight of the second gypsum board 3 and the outer wall material 5. When the support member 20 is used, in the fixing portion 201, the upper end portion on the outer wall material 5 side is referred to as the upper end portion 201a, and the lower end portion on the outer wall material 5 side is referred to as the lower end portion 201b. Hereinafter, the support member 20 of FIG. 14 will be described, but the shape of the support member 20 is not limited to the shape of FIG. Further, as shown in FIG. 14, the support member 20 may include a first holding portion 202 at the lower end of the fixing portion 201 and a second holding portion 203 at the upper end of the fixing portion 201. Alternatively, the first holding portion 202 may be provided at the upper end of the fixing portion 201, and the second holding portion 203 may be provided at the lower end of the fixing portion 201. Alternatively, the first holding portion 202 may be provided in the middle of the fixing portion 201 in the vertical direction, and the second holding portion 203 may be provided at the upper end or the lower end of the fixing portion 201.

The fixing portion 201 is appropriately provided with a fixing hole 210 for inserting the fixing member. The first holding portion 202 is composed of the first piece 221 and the second piece 222, the third piece 223, the fourth piece 224, the fifth piece 225, and the sixth piece 226. The sixth piece 226 is provided so as to project forward from the lower end portion 201b of the fixing portion 201. The fifth piece 225 is provided so as to project downward from the front end of the sixth piece 226. The fourth piece 224 is provided so as to project upward from the lower end of the fifth piece 225, and is provided parallel to the surface of the fifth piece 225. The first piece 221 is provided so as to project forward from the upper end of the fourth piece 224. The second piece 222 is provided so as to project from the front end of the first piece 221 toward the upper end portion 201a side of the fixing portion 201, and supports the upper outer wall material 5 attached to the front side of the upper end portion 201a (see FIG. 13). .. In FIG. 14, the second piece 222 is continuously provided over substantially the entire length of the first piece 221 in the left-right direction without being divided. The third piece 223 is provided so as to project downward from the front end of the first piece 221 and supports the lower outer wall material 5 attached to the front side of the fourth piece 224. In FIG. 14, the third piece 223 is divided into a plurality of pieces. The second piece 222 may be divided and provided in the same manner as the third piece 223. Further, the third piece 223 may be continuously provided like the second piece 222. The fourth piece 224 is in contact with the back surface of the lower outer wall material 5 when the support member 20 is used, and supports the lower outer wall material 5 together with the third piece 223 (see FIG. 13). The rear end of the first piece 221 may be connected to the lower end portion 201b of the fixed portion 201, and the first piece 221 and the sixth piece 226 are continuously integrated into one flat plate. The fourth piece 224 may protrude from the lower surface. The fourth piece 224 and the fifth piece 225 may also be an integrated flat plate.

In FIG. 14, the second holding portion 203 is composed of the first piece 231, the second piece 232, and the third piece 233. The first piece 231 of the second holding portion 203 has a length shorter than the combined protrusion length of the first piece 221 and the sixth piece 226 of the first holding portion 202 from the upper end of the fixing portion 201. It is provided so as to project forward. The first piece 231 of the second holding portion 203 can have substantially the same protruding length as the sixth piece 226 of the first holding portion 202. That is, the first piece 231 is provided so as to project forward from the upper end portion 201a of the fixing portion 201. The second piece 232 projects upward from the front end of the first piece 231. The third piece 233 projects rearward from the upper end of the second piece 232. In FIG. 14, the lengths of the first piece 231 and the third piece 233 are the same as the protruding length L of the second holding portion 203. The second piece 232 is in contact with the back surface of the outer wall material 5, a ventilation space is formed between the outer wall material 5 and the second gypsum board 3, and the outer wall material 5 is subjected to a force in the thickness direction of the outer wall material 5. Can be supported (see FIG. 13). The support member 20 may include an outward piece 234 extending in parallel with the fixing portion 201 from the rear end of the third piece 233. The outward piece 234 makes it easier to suppress the deformation of the third piece 233.

The support member 20 can be obtained by appropriately cutting or bending a metal plate such as a steel plate. In FIG. 14, for example, in the first holding portion 202, the sixth piece 226 can be formed by bending the fixing portion 201, and the fifth piece 225 can be formed by bending the sixth piece 226. The four pieces 224 can be formed by bending the fifth piece 225, the first piece 221 can be formed by bending the fourth piece 224, and the second piece 222 and the third piece 223 can be formed by bending the first piece 221. It can be formed by cutting up a part of. Further, in the second holding portion 203, the first piece 231 and the second piece 232 and the third piece 233 can be formed by bending a part of the fixing portion 201. By using the support member 20 in which the fastener 6 and the metal auxiliary material 19 are integrated, the construction is facilitated, and it is possible to obtain the functions of both the fastener 6 and the metal auxiliary material 19 with one member. It is more efficient and preferable because it can be done. The shape and size of the support member 20 are appropriately selected.

The length of the support member 20 in the left-right direction is appropriately set, but as shown in FIG. 14, the support member 20 is preferably long. When the long side of the outer wall material 5 is longer than that of the second gypsum board 3, the length of the support member 20 in the left-right direction is preferably longer than the lateral sides 37 and 38 of the second gypsum board 3, and the outer wall material 5 It is more preferable that the lengths of the long sides 57 and 58 of the above are substantially the same. Approximately the same means that they do not have to be exactly the same, but may be slightly shorter. For example, the support member 20 may be shorter than the long sides 57 and 58 of the outer wall material 5 so as not to overlap with the joiner 14. As a result, the second gypsum board 3 can be pressed more stably from the surface side. As the support member 20, a plurality of support members 20 whose left and right lengths are shorter than 1/2 the length of the long side of the outer wall material 5 may be arranged.

Hereinafter, a modified example of the support member 20 shown in FIG. 14 will be described with reference to FIGS. 19A, 19B, and 19C.

The support member 20 includes a first holding portion 202 at the lower end of the fixing portion 201, and a second holding portion 203 at the upper end of the fixing portion 201 (see FIG. 19A).

The fixing portion 201 is appropriately provided with a fixing hole 210 for inserting the fixing member (see FIGS. 19A and 19B).

As shown in FIG. 19A, the first holding portion 202 is composed of the first piece 221 and the second piece 222, the third piece 223, the fourth piece 224, and the sixth piece 226.

The sixth piece 226 projects forward from the lower end portion 201b of the fixing portion 201. The sixth piece 226 is provided with a plurality of ventilation holes 212 (see FIGS. 19A and 19C). The shape of the ventilation hole 212 is, for example, an ellipse.

The fourth piece 224 projects upward from the front end of the sixth piece 226.

The first piece 221 projects forward from the upper end of the fourth piece 224.

The second piece 222 projects obliquely upward from the front end of the first piece 221.

The third piece 223 projects forward from the front end of the first piece 221 and the front end thereof is bent downward.

In the support member 20, the second piece 222 and the third piece 223 are provided alternately side by side at the front end of the first piece 221 (see FIGS. 19A, 19B, and 19C). That is, the third piece 223 is provided on both sides of the second piece 222 at the front end of the first piece 221.

As shown in FIG. 19A, the second holding portion 203 is composed of the first piece 231, the second piece 232, and the third piece 233.

The protrusion length of the first piece 231 protruding forward from the upper end portion 201a of the fixed portion 201 is substantially the same as the protrusion length of the sixth piece 226 of the first holding portion 202. .. .. The first piece 231 is provided with a plurality of ventilation holes 212 (see FIG. 19A). The shape of the ventilation hole 212 is, for example, an ellipse.

The second piece 232 projects upward from the front end of the first piece 231.

The third piece 233 projects rearward from the upper end of the second piece 232. The protruding length of the third piece 233 is shorter than the protruding length of the first piece 231.

Subsequently, an example of a steel-framed outer wall fireproof structure in which the support member 20 shown in FIG. 19 is installed will be described with reference to FIG.

As shown in FIG. 20, a fixing member such as a screw passes through the fixing hole 210 of the fixing portion 201 and penetrates the moisture-permeable waterproof sheet 4, the second gypsum board 3, and the first gypsum board 2. By inserting up to the lightweight steel frame 1, the support member 20 is fixed on the second gypsum board 3.

The second piece 222 of the first holding portion 202 supports the upper outer wall material 5 (see FIG. 20).

The bent portion of the third piece 223 of the first holding portion 202 and the fourth piece 224 of the first holding portion 202 sandwich and hold the lower outer wall material 5 (see FIG. 20).

The second piece 232 of the second holding portion 203 is in contact with the back surface of the upper outer wall material 5, and the second piece 232 is connected to the fixing portion 201 via the first piece 231. Further, the fourth piece 224 of the second holding portion 202 is in contact with the back surface of the lower outer wall material 5, and the fourth piece 224 is connected to the fixing portion 201 via the sixth piece 226. Therefore, as shown in FIG. 20, a ventilation space is formed between the upper outer wall material 5 and the lower outer wall 5 and the second gypsum board 3.

Further, the sixth piece 226 of the first holding portion 202 is provided with the ventilation hole 212, and the first piece 211 of the second holding portion 203 is provided with the ventilation hole 211. Air can pass through the ventilation holes 212 and the ventilation holes 211. Further, since the protruding length of the third piece 233 of the second holding portion 203 is shorter than the protruding length of the first piece 231, the air flow through the ventilation hole 211 provided in the first piece 231 is blocked. Hard to get rid of. Therefore, in the steel-framed outer wall fireproof structure shown in FIG. 20, by installing the support member 20 shown in FIG. 19, the air permeability of the ventilation space between the outer wall material 5 and the second gypsum board 3 is sufficiently made. Can be secured.

1 Lightweight steel frame 2 First gypsum board 3 Second gypsum board 5 Outer wall material 6 Fasteners 7, 8, 9, 10 Butts 25, 26, 35, 36 Vertical sides 27, 28, 37, 38 Horizontal sides 55, 56 Long side 57, 58 Short side

Claims (4)

A plurality of vertically long lightweight steel frames, a first rectangular gypsum board in front view, a second rectangular gypsum board in front view, and a rectangular outer wall material in front view are formed on the surface of the lightweight steel frame. Prepare in order,
The first gypsum board and the second gypsum board are the same size and both have a thickness of 15 mm.
The first gypsum board is fixed to the surface of the lightweight steel frame by a fixing member so that the two vertical sides are located on the lightweight steel frame which is the vertical furring strip.
The second gypsum board is said to be on the surface of the first gypsum board so that the two vertical sides are located on the lightweight steel frame different from the lightweight steel frame on which the vertical sides of the first gypsum board are located. It is fixed to the lightweight steel frame by the fixing member via the first gypsum board.
The two lateral sides of the second gypsum board and the two lateral sides of the first gypsum board are positioned so as to be offset in the vertical direction.
A moisture permeable waterproof sheet is provided on the entire surface of the second gypsum board.
The outer wall material is constructed so that the two long sides are installed in the horizontally long direction and do not overlap the two side sides of the first gypsum board and the two side sides of the second gypsum board in the thickness direction. It is fixed to the lightweight steel frame by fasteners via a first gypsum board and the second gypsum board.
The back surface temperature of the first gypsum board 75 minutes after the start of heating when heated from the outer wall material side according to the standard heating curve defined in ISO834 does not exceed 271 ° C.
The steel-framed outer wall fireproof structure is characterized by this. The first gypsum board and the second gypsum board are both reinforced gypsum boards that have been waterproofed with a water-repellent material.
The steel-framed outer wall fireproof structure according to claim 1. The length of the vertical side of the first gypsum board and the length of the vertical side of the second gypsum board are each twice the length of the short side of the outer wall material.
The lateral side of the second gypsum board and the lateral side of the first gypsum board are located vertically offset by the same length as the short side of the outer wall material.
The two long sides of the outer wall material are located substantially at the center between the lateral side of the first gypsum board and the lateral side of the second gypsum board in the vertical direction.
The steel-framed outer wall fireproof structure according to claim 1 or 2. Aluminum tape is provided over substantially the entire length at the abutting portion of the front surface of the first gypsum board which is butted up and down and adjacent to each other, and the back surface temperature does not exceed 126 ° C.
The steel-framed outer wall fireproof structure according to any one of claims 1 to 3.

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