Fire resistive covering method and fire resistive covering structure for column beam connection part

Abstract

To provide a fire resistive covering method for a column beam connection part and a fire resistive covering structure for the column beam connection part capable of covering the column beam connection part with a fire resistive covering material without arranging a substrate material.SOLUTION: A fire resistive covering method and a fire resistive covering structure for a column beam connection part, wherein the method comprises steps of: attaching column side fire resistive covering material 40a so as to arrange a column side bracing surface 17 on a column side covering surface 14 of a wooden column 10 in a factory; attaching beam side fire resistive covering material 50a so as to arrange a beam side bracing surface 26 on a beam side covering surface 24 of the wooden beam 20 in the factory; connecting the wooden column 10 and a wooden beam 20 such that the column side covering surface 17 and the beam side covering surface 26 become flush to each other using a column side connection metal fitting 12 and a beam side connection metal fitting 22 at a construction site; and covering the column side connection metal fitting 12 and the beam side connection metal fitting 22 through attachment of bracing side fire resistive covering material 60 over the column side bracing surface 17 and the beam side bracing surface 26 at the construction site.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a fireproof coating method and a fireproof coating structure for a column-beam joint where a wooden beam is joined to a wooden column.

Background Art

[0002] For example, as buildings such as training facilities, employee dormitories, and apartment houses, in order to take environmental measures, a part of the building structure is made of wood using wooden columns and wooden beams, which is known. In such buildings, in order to enhance the fire resistance of the building structure, it is common to attach a fireproof coating material such as a gypsum board to the surface of the wooden column and the surface of the wooden beam, respectively.

[0003] Conventionally, as a fireproof coating method or a fireproof coating structure for coating a column-beam joint where a wooden beam is joined to a wooden column with a fireproof coating material, at a factory, a fireproof coating material is preliminarily attached to the surface of the wooden column and the surface of the wooden beam, and after joining the wooden column and the wooden beam transported by a truck or the like at a construction site using a joining fitting, a fireproof coating material is attached to the remaining part of the column-beam joint so as to cover the joining fitting. A fireproof coating method or a fireproof coating structure is known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the above conventional fireproof coating method or fireproof coating structure, in order to attach a fireproof coating material that covers the joining fitting, it is necessary to provide a base material that supports the fireproof coating material between the wooden column and the wooden beam, and there is a problem that the work is complicated.

[0006] The present invention has been made in view of such problems, and an object thereof is to provide a fireproof coating method and a fireproof coating structure for a column-beam joint that can cover the column-beam joint with a fireproof coating material without providing a base material.

Means for Solving the Problems

[0007] The fireproof coating method for a column-beam joint of the present invention is a fireproof coating method for a column-beam joint in which a wooden beam is joined to a wooden column. In a factory, on a column-side coating surface perpendicular to a column-side joint surface of the wooden column where the wooden beam is joined, a column-side retaining surface is provided so that the column-side coating surface is exposed in a predetermined range from the side of the column-side joint surface, and a column-side fireproof coating material is attached. In a factory, on a beam-side coating surface perpendicular to a beam-side joint surface of the wooden beam where the wooden beam is joined to the wooden column, a beam-side retaining surface is provided so that the beam-side coating surface is exposed in a predetermined range from the side of the beam-side joint surface, and a beam-side fireproof coating material is attached. At a construction site, the wooden beam with the beam-side fireproof coating material attached is joined to the wooden column with the column-side fireproof coating material attached using a column-side joining fitting attached to the column-side joint surface and a beam-side joining fitting attached to the beam-side joint surface so that the column-side coating surface and the beam-side coating surface are in the same plane. At a construction site, after joining the wooden beam to the wooden column, a retaining surface-side fireproof coating material is attached across the column-side retaining surface and the beam-side retaining surface to cover the column-side joining fitting and the beam-side joining fitting with the retaining surface-side fireproof coating material.

[0008] In the fireproof coating method for a column-beam joint of the present invention, in the above configuration, it is preferable that the column-side fireproof coating material, the beam-side fireproof coating material, and the retaining surface-side fireproof coating material are each a water-resistant reinforced gypsum board.

[0009] The fireproof covering method for the column-beam joint of the present invention, in the above configuration, in a factory, a sub-column side holding surface where the surface of the column side fireproof covering material is exposed in a predetermined range from the side of the column side holding surface is provided on the column side fireproof covering material, and a sub-column side fireproof covering material is pasted; in a factory, a sub-beam side holding surface where the surface of the beam side fireproof covering material is exposed in a predetermined range from the side of the beam side holding surface is provided on the beam side fireproof covering material, and a sub-beam side fireproof covering material is pasted; at a construction site, after pasting the holding surface side fireproof covering material across the column side holding surface and the beam side holding surface, a sub-holding surface side fireproof covering material is pasted across the sub-column side holding surface and the sub-beam side holding surface. It is preferably further provided with.

[0010] The fireproof covering structure of the column-beam joint of the present invention is a fireproof covering structure of a column-beam joint where a wooden beam is joined to a wooden column. On the column side covering surface perpendicular to the column side joint surface where the wooden beam is joined on the wooden column, a column side fireproof covering material pasted so that a column side holding surface where the column side covering surface is exposed in a predetermined range from the side of the column side joint surface is provided; on the beam side covering surface perpendicular to the beam side joint surface where the wooden beam is joined to the wooden column and in the same plane as the column side covering surface, a beam side fireproof covering material pasted so that a beam side holding surface where the beam side covering surface is exposed in a predetermined range from the side of the beam side joint surface is provided; and a holding surface side fireproof covering material pasted across the column side holding surface and the beam side holding surface, covering the column side fitting attached to the column side joint surface and the beam side fitting attached to the beam side joint surface and joined to the column side fitting. It is characterized by having.

Effects of the Invention

[0011] According to the present invention, it is possible to provide a fireproof covering method for a column-beam joint and a fireproof covering structure for a column-beam joint that can cover the column-beam joint with a fireproof covering material without providing a base material.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0013] Hereinafter, with reference to the drawings, a fireproof covering method for a column-beam joint and a fireproof covering structure for a column-beam joint according to an embodiment of the present invention will be exemplified and described in detail.

[0014] The fireproof covering structure 1 for a column-beam joint according to an embodiment of the present invention shown in FIGS. 1 and 2 can be applied to a column-beam joint 30 between a wooden column 10 and a wooden beam 20 in a building 2 having a wooden structure portion in which a part of its frame 3 is composed of the wooden column 10 and the wooden beam 20, such as a building 2 used for a training facility, a company dormitory, an apartment house, etc.

[0015] The wooden column 10 is a column formed of wood and extends straight along the vertical direction. In the present embodiment, the wooden column 10 is formed of a glued laminated timber of wood, and its cross-section is square. Note that the wooden column 10 may be formed of a solid wood material. Further, the cross-sectional shape of the wooden column 10 is not limited to a square, and may be various shapes such as a rectangular shape, for example.

[0016] The wooden beam 20 is a beam formed of wood and extends straight along the horizontal direction. In the present embodiment, the wooden beam 20 is formed of a glued laminated timber of wood, and its cross-section is a rectangular shape in which the dimension in the vertical direction is larger than the dimension in the horizontal direction. Note that the wooden beam 20 may be formed of a solid wood material. Further, the cross-sectional shape of the wooden beam 20 is not limited to the above rectangular shape, and may be various shapes such as a square, for example.

[0017] The surface of the wooden column 10 to which the wooden beam 20 is joined, that is, the surface facing the right side in FIGS. 1 and 2, is the column-side joint surface 11, and a column-side fitting 12 is attached to the column-side joint surface 11. The column-side fitting 12 includes a column-side gusset plate 12a made of steel plate that is inserted into a groove 13 formed in the column-side joint surface 11 and fixed to the wooden column 10 using a pin member (not shown), a support plate 12b fixed to the column-side gusset plate 12a by welding or the like, and a column-side joint portion 12c fixed to the upper end of the support plate 12b by welding or the like.

[0018] The surface of the wooden beam 20 to which the wooden column 10 is joined, that is, the surface facing the left side in FIGS. 1 and 2, is the beam-side joint surface 21, and a beam-side fitting 22 is attached to the beam-side joint surface 21. The beam-side fitting 22 includes a beam-side gusset plate 22a made of steel plate that is inserted into a groove 23 formed in the beam-side joint surface 21 and fixed to the wooden beam 20 using a pin member (not shown), a support plate 22b fixed to the beam-side gusset plate 22a by welding or the like, and a beam-side joint portion 22c fixed to the lower end of the support plate 22b by welding or the like.

[0019] The wooden beam 20 is pin - joined to the wooden column 10 by the column - side joining fitting 12 and the beam - side joining fitting 22. That is, the wooden beam 20 is in a posture where the beam - side joint surface 21 faces the column - side joint surface 11 of the wooden column 10, and the beam - side joint portion 22c of the beam - side joining fitting 22 is placed on top of the column - side joint portion 12c of the column - side joining fitting 12 and fastened by fastening members (not shown) such as bolts and nuts, thereby being pin - joined to the wooden column 10.

[0020] Note that the wooden beam 20 may be configured to be joined to the wooden column 10 using joining fittings having a configuration or shape different from the above. In this case, the wooden beam 20 may be pin - joined or rigidly joined to the wooden column 10.

[0021] One surface perpendicular to the column - side joint surface 11 of the wooden column 10, that is, the surface facing downward in FIG. 2, is the column - side covering surface 14. Also, one surface perpendicular to the beam - side joint surface 21 of the wooden beam 20, that is, the surface facing downward in FIG. 2, is the beam - side covering surface 24. The wooden beam 20 is joined to the wooden column 10 such that the column - side covering surface 14 and the beam - side covering surface 24 are in the same planar state.

[0022] As shown in FIG. 2, in this embodiment, the horizontal width of the wooden beam 20 is narrower than the horizontal width of the wooden column 10. Therefore, the other surface perpendicular to the beam - side joint surface 21 of the wooden beam 20, that is, the beam - side covering surface 25 facing upward in FIG. 2, is displaced downward, i.e., toward the side of the column - side covering surface 14, with respect to the other surface perpendicular to the column - side joint surface 11 of the wooden column 10, that is, the column - side covering surface 15 facing upward in FIG. 2.

[0023] In this embodiment, the column - side joining fitting 12 is also attached to the column - side covering surface 16 and the column - side covering surface 15 of the wooden column 10 that face the side opposite to the column - side joint surface 11, and other wooden beams (not shown) are joined using these column - side joining fittings 12. Note that the wooden column 10 may be configured such that no wooden beam 20 is joined to the column - side covering surface 16 and the column - side covering surface 15, or a wooden beam 20 may be joined to only one of the column - side covering surface 16 and the column - side covering surface 15.

[0024] On the surface of the wooden column 10, a column-side fireproof coating material 40 is attached. In this embodiment, the column-side fireproof coating material 40 is a water-resistant reinforced gypsum board. Note that the column-side fireproof coating material 40 is not limited to the water-resistant reinforced gypsum board as long as it has fire resistance, and other materials may be used.

[0025] More specifically, on the column-side covering surface 14 of the wooden column 10, a column-side fireproof coating material 40a is attached so that a column-side recessed surface 17 where the column-side covering surface 14 is exposed in a predetermined range from the side of the column-side joint surface 11 is provided. The column-side recessed surface 17 is a portion where the column-side fireproof coating material 40a is not attached. The column-side recessed surface 17 may be provided with a vertical length corresponding to the vertical height of the wooden beam 20.

[0026] On the column-side covering surface 15 and the column-side covering surface 16 of the wooden column 10, column-side fireproof coating materials 40b to 40c are attached so as to cover the entire width direction of the column-side covering surface 15 to the column-side covering surface 16, respectively. Also, on the column-side joint surface 11 of the wooden column 10, a column-side fireproof coating material 40d is attached to a portion in a predetermined range from the column-side covering surface 15, which forms a step difference with the wooden beam 20, toward the column-side covering surface 14.

[0027] In this embodiment, the wooden column 10 is configured such that a secondary column-side fireproof coating material 41 is further attached outside the column-side fireproof coating material 40. The secondary column-side fireproof coating material 41 can also be formed of a water-resistant reinforced gypsum board, similar to the column-side fireproof coating material 40. Note that the secondary column-side fireproof coating material 41 is not limited to the water-resistant reinforced gypsum board as long as it has fire resistance, and other materials may be used.

[0028] More specifically, on the column-side fireproof coating material 40a attached to the column-side covering surface 14, a secondary column-side fireproof coating material 41a is attached so that a secondary column-side recessed surface 18 where the surface of the column-side fireproof coating material 40a is exposed in a predetermined range from the side of the column-side recessed surface 17 is provided. The secondary column-side recessed surface 18 is a portion where the secondary column-side fireproof coating material 41a is not attached.

[0029] On the column-side fireproof coating materials 40b to 40c attached to the column-side covering surfaces 15 to 16, sub-column-side fireproof coating materials 41b to 41c are respectively attached so as to cover the entire width direction of the column-side fireproof coating materials 40b to 40c. Also, on the column-side fireproof coating material 40d attached to the column-side joint surface 11, a sub-column-side fireproof coating material 41d is attached.

[0030] Note that the column-side fireproof coating materials 40a to 40d and the sub-column-side fireproof coating materials 41a to 41d may each be formed of a single fireproof coating material, or may be a combination of those divided into a plurality of fireproof coating materials.

[0031] Similar to the wooden column 10, a beam-side fireproof coating material 50 is attached to the surface of the wooden beam 20. The thickness of the beam-side fireproof coating material 50 is the same as the thickness of the column-side fireproof coating material 40. In this embodiment, the beam-side fireproof coating material 50 is a water-resistant reinforced gypsum board. Note that the beam-side fireproof coating material 50 is not limited to the water-resistant reinforced gypsum board as long as it has fire resistance, and may be made of other materials.

[0032] More specifically, on the beam-side covering surface 24 of the wooden beam 20, a beam-side fireproof coating material 50a is attached so that a beam-side soffit surface 26 where the beam-side covering surface 24 is exposed in a predetermined range from the side of the beam-side joint surface 21 is provided. The beam-side soffit surface 26 is a portion where the beam-side fireproof coating material 50a is not attached. The beam-side soffit surface 26 may be provided with a vertical length corresponding to the vertical height of the wooden beam 20.

[0033] On the beam-side covering surface 25 of the wooden beam 20, a beam-side fireproof coating material 50b is attached so that a beam-side soffit surface 27 where the beam-side covering surface 25 is exposed in a predetermined range from the side of the beam-side joint surface 21 is provided. The beam-side soffit surface 27 is a portion where the beam-side fireproof coating material 50b is not attached. The beam-side soffit surface 27 may be provided with a vertical length corresponding to the vertical height of the wooden beam 20. Also, on the lower surface of the wooden beam 20, a beam-side fireproof coating material 50c is attached so as to cover the entire lower surface.

[0034] Note that since the upper surface of the wooden beam 20 is covered with the deck receiver 19 provided on the wooden column 10 and a slab (not shown) supported by the wooden beam 20, a fire-resistant coating material may not be provided.

[0035] In the present embodiment, the wooden beam 20 is configured such that a secondary beam side fire-resistant coating material 51 is further attached to the outside of the beam side fire-resistant coating material 50. The thickness of the secondary beam side fire-resistant coating material 51 is the same as the thickness of the secondary column side fire-resistant coating material 41. In the present embodiment, the secondary beam side fire-resistant coating material 51 can also be formed of a water-resistant reinforced gypsum board, similar to the beam side fire-resistant coating material 50. Note that as long as the secondary beam side fire-resistant coating material 51 has fire resistance, it is not limited to the water-resistant reinforced gypsum board and may be made of other materials.

[0036] More specifically, on the beam side fire-resistant coating material 50a attached to the beam side covering surface 24, a secondary beam side retaining surface 28 is provided so that the surface of the beam side fire-resistant coating material 50a is exposed in a predetermined range from the side of the beam side retaining surface 26, and the secondary beam side fire-resistant coating material 51a is attached. The secondary beam side retaining surface 28 is a portion where the secondary beam side fire-resistant coating material 51a is not attached.

[0037] On the beam side fire-resistant coating material 50b attached to the beam side covering surface 25, a secondary beam side retaining surface 29 is provided so that the surface of the beam side fire-resistant coating material 50b is exposed in a predetermined range from the side of the beam side retaining surface 27, and the secondary beam side fire-resistant coating material 51b is attached. The secondary beam side retaining surface 29 is a portion where the secondary beam side fire-resistant coating material 51b is not attached. Also, on the beam side fire-resistant coating material 50c attached to the lower surface of the wooden beam 20, the secondary beam side fire-resistant coating material 51c is attached so as to cover the entire beam side fire-resistant coating material 50c.

[0038] In order to cover the column-side fitting 12 and the beam-side fitting 22 between the column-side joint surface 11 of the wooden column 10 and the beam-side joint surface 21 of the wooden beam 20, a soffit-side fireproof covering material 60 is attached across the column-side soffit surface 17 and the beam-side soffit surface 26. The thickness of the soffit-side fireproof covering material 60 is the same as the thicknesses of the column-side fireproof covering material 40a and the beam-side fireproof covering material 50a. In this embodiment, the soffit-side fireproof covering material 60 is a water-resistant reinforced gypsum board. Note that the soffit-side fireproof covering material 60 is not limited to the water-resistant reinforced gypsum board and may be made of other materials as long as it has fire resistance.

[0039] More specifically described, the soffit-side fireproof covering material 60 is attached to the column-side soffit surface 17 on the side of the wooden column 10, attached to the beam-side soffit surface 26 on the side of the wooden beam 20, and is disposed across the column-side joint surface 11 of the wooden column 10 and the beam-side joint surface 21 of the wooden beam 20. That is, the soffit-side fireproof covering material 60 is attached to the column-beam joint portion 30 between the wooden column 10 and the wooden beam 20 without providing a base material between the column-side joint surface 11 of the wooden column 10 and the beam-side joint surface 21 of the wooden beam 20.

[0040] Both ends of the soffit-side fireproof covering material 60 preferably abut against the ends of the column-side fireproof covering material 40a and the ends of the beam-side fireproof covering material 50a, respectively, but may also face each other with a slight gap. Further, the soffit-side fireproof covering material 60 may be configured to be divided into a portion attached to the column-side soffit surface 17 and a portion attached to the beam-side soffit surface 26.

[0041] In this embodiment, a secondary soffit-side fireproof covering material 70 is further attached to the outside of the soffit-side fireproof covering material 60. The thickness of the secondary soffit-side fireproof covering material 70 is the same as the thicknesses of the secondary column-side fireproof covering material 41a and the secondary beam-side fireproof covering material 51a. In this embodiment, the secondary soffit-side fireproof covering material 70 is a water-resistant reinforced gypsum board. Note that the secondary soffit-side fireproof covering material 70 is not limited to the water-resistant reinforced gypsum board and may be made of other materials as long as it has fire resistance.

[0042] More specifically, the secondary soffit-side fireproof coating material 70 is attached across the secondary column-side soffit surface 18 and the secondary beam-side soffit surface 28. Note that both ends of the secondary soffit-side fireproof coating material 70 preferably abut against the ends of the secondary column-side fireproof coating material 41a and the secondary beam-side fireproof coating material 51a, respectively, but they may also face each other with a slight gap.

[0043] On the side of the beam-side coating surface 25 of the wooden beam 20, a soffit-side fireproof coating material 61 is attached to the soffit surface 27. The thickness of the soffit-side fireproof coating material 61 is the same as that of the beam-side fireproof coating material 50a. One end of the soffit-side fireproof coating material 61 abuts against or faces the end of the beam-side fireproof coating material 50a with a slight gap, and the other end abuts against or faces the column-side joint surface 11 with a slight gap. In this embodiment, the soffit-side fireproof coating material 61 is a water-resistant reinforced gypsum board. Note that the soffit-side fireproof coating material 61 is not limited to the water-resistant reinforced gypsum board as long as it has fire resistance, and other materials may also be used.

[0044] In addition, a secondary soffit-side fireproof coating material 71 is further attached to the outside of the soffit-side fireproof coating material 61. The thickness of the secondary soffit-side fireproof coating material 71 is the same as that of the secondary beam-side fireproof coating material 51b. The secondary soffit-side fireproof coating material 71 is attached to a part of one end side to the secondary beam-side soffit surface 29. One end abuts against or faces the end of the beam-side fireproof coating material 51a with a slight gap, and the other end abuts against or faces the secondary column-side fireproof coating material 41d attached to the column-side joint surface 11 with a slight gap. In this embodiment, the secondary soffit-side fireproof coating material 71 is a water-resistant reinforced gypsum board. Note that the secondary soffit-side fireproof coating material 71 is not limited to the water-resistant reinforced gypsum board as long as it has fire resistance, and other materials may also be used.

[0045] Although not shown in detail, on the lower surface side of the wooden beam 20, a fireproof coating material may be attached with the same configuration as that on the beam-side coating surface 24 and the beam-side coating surface 25.

[0046] Thus, in the fireproof covering structure 1 of the column-beam joint according to this embodiment, the column-side fireproof covering material 40a is attached to the column-side covering surface 14 of the wooden column 10 such that the column-side holding surface 17 is provided, and the beam-side fireproof covering material 50a is attached to the beam-side covering surface 24 of the wooden beam 20 such that the beam-side holding surface 26 is provided. Further, the holding surface-side fireproof covering material 60 is attached across the column-side holding surface 17 and the beam-side holding surface 26. Therefore, the holding surface-side fireproof covering material 60 can be attached to the column-beam joint 30 between the wooden column 10 and the wooden beam 20 without providing a base material. As a result, the column-beam joint 30 can be covered with a fireproof covering material with a simpler structure.

[0047] Moreover, in the fireproof covering structure 1 of the column-beam joint according to this embodiment, since the sub-holding surface-side fireproof covering material 70 is further attached to the outside of the holding surface-side fireproof covering material 60, the fire resistance of the column-beam joint 30 can be further enhanced. Further, since both ends of the sub-holding surface-side fireproof covering material 70 will be displaced with respect to both ends of the holding surface-side fireproof covering material 60, the joints between the holding surface-side fireproof covering material 60 and the column-side fireproof covering material 40a or the beam-side fireproof covering material 50a and the joints between the sub-holding surface-side fireproof covering material 70 and the sub-column-side fireproof covering material 41a or the sub-beam-side fireproof covering material 51a will not become continuous joints, and thus the fire resistance of the column-beam joint 30 can be further enhanced.

[0048] Furthermore, in the fireproof covering structure 1 of the column-beam joint according to this embodiment, since the column-side fireproof covering material 40, the beam-side fireproof covering material 50, and the holding surface-side fireproof covering material 60 are each formed of a water-resistant reinforced gypsum board, the fire resistance of the column-beam joint 30 can be enhanced while improving the waterproof and antifungal properties of the column-side fireproof covering material 40, the beam-side fireproof covering material 50, and the holding surface-side fireproof covering material 60.

[0049] Furthermore, when the sub-column-side fireproof covering material 41, the sub-beam-side fireproof covering material 51, and the sub-holding surface-side fireproof covering material 70 are each formed of a water-resistant reinforced gypsum board, the fire resistance of the column-beam joint 30 can be further enhanced while improving the waterproof and antifungal properties of the sub-column-side fireproof covering material 41, the sub-beam-side fireproof covering material 51, and the sub-holding surface-side fireproof covering material 70.

[0050] Next, a procedure for constructing the fire-resistant coating structure 1 of the column-beam joint having the above configuration will be described by the fire-resistant coating method for the column-beam joint according to an embodiment of the present invention.

[0051] As shown in FIG. 3, first, at the factory, the column-side fire-resistant coating material 40 is attached to the wooden column 10. More specifically, at the factory, the column-side fire-resistant coating material 40a is attached to the column-side coating surface 14 perpendicular to the column-side joint surface 11 where the wooden beam 20 is joined to the wooden column 10 so that a column-side holding surface 17 where the column-side coating surface 14 is exposed in a predetermined range from the side of the column-side joint surface 11 is provided.

[0052] Also, in the present embodiment, at the factory, the sub-column-side fire-resistant coating material 41 is attached on the column-side fire-resistant coating material 40. More specifically, at the factory, the sub-column-side fire-resistant coating material 41a is attached on the column-side fire-resistant coating material 40a so that a sub-column-side holding surface 18 where the surface of the column-side fire-resistant coating material 40a is exposed in a predetermined range from the side of the column-side holding surface 17 is provided.

[0053] Furthermore, in the present embodiment, at the factory, the column-side fire-resistant coating materials 40b and 40c are also attached to the column-side coating surfaces 15 and 16 of the wooden column 10, respectively, and the sub-column-side fire-resistant coating materials 41b and 41c are attached on the column-side fire-resistant coating materials 40b and 40c.

[0054] Similarly, as shown in FIG. 4, at the factory, the beam-side fire-resistant coating material 50 is attached to the wooden beam 20. More specifically, the beam-side fire-resistant coating material 50a is attached to the beam-side coating surface 24 perpendicular to the beam-side joint surface 21 where the wooden beam 20 is joined to the wooden column 10 so that a beam-side holding surface 26 where the beam-side coating surface 24 is exposed in a predetermined range from the side of the beam-side joint surface 21 is provided.

[0055] Also, in the present embodiment, at the factory, the sub-beam-side fire-resistant coating material 51 is attached on the beam-side fire-resistant coating material 50. More specifically, at the factory, the sub-beam-side fire-resistant coating material 51a is attached on the beam-side fire-resistant coating material 50a so that a sub-beam-side holding surface 28 where the surface of the beam-side fire-resistant coating material 50a is exposed in a predetermined range from the side of the beam-side holding surface 26 is provided.

[0056] Furthermore, in the present embodiment, at the factory, the side fireproof covering material 50b of the wooden beam 20 is attached to the beam side covering surface 25 of the wooden beam 20 such that a beam side retaining surface 27 where the beam side covering surface 25 is exposed in a predetermined range from the side of the beam side joint surface 21 is provided, and the secondary beam side fireproof covering material 51b is attached onto the side fireproof covering material 51a of the beam such that a secondary beam side retaining surface 29 where the surface of the side fireproof covering material 51a of the beam is exposed in a predetermined range from the side of the beam side retaining surface 27 is provided.

[0057] The above factory may be provided at a location separate from the construction site of the building 2. Further, the above factory may be a factory for manufacturing the wooden columns 10 and the wooden beams 20 from wood.

[0058] Next, the wooden column 10 with the column side fireproof covering material 40 and the secondary column side fireproof covering material 41 attached thereto and the wooden beam 20 with the beam side fireproof covering material 50 and the secondary beam side fireproof covering material 51 attached thereto are transported to the construction site of the building 2.

[0059] Then, as shown in FIG. 5, at the construction site, after the wooden column 10 with the column side fireproof covering material 40 and the secondary column side fireproof covering material 41 attached thereto is erected, the wooden beam 20 with the beam side fireproof covering material 50 and the secondary beam side fireproof covering material 51 attached thereto is attached to the column side joint fitting 12 attached to the column side joint surface 11 and the beam side joint fitting 22 attached to the beam side joint surface 21 such that the column side covering surface 14 and the beam side covering surface 24 are flush with each other.

[0060] Next, as shown in FIG. 6, at the construction site, the retaining surface side fireproof covering material 60 is attached across the column side retaining surface 17 of the wooden column 10 and the beam side retaining surface 26 of the wooden beam 20. When the retaining surface side fireproof covering material 60 is attached, the column side joint fitting 12 and the beam side joint fitting 22 are covered by the retaining surface side fireproof covering material 60.

[0061] Also, as shown in Fig. 7, in this embodiment, at the construction site, after attaching the fireproof covering material 60 on the surface side to the column side facing surface 17 of the wooden column 10 and the beam side facing surface 26 of the wooden beam 20, the auxiliary facing surface side fireproof covering material 70 is attached across the auxiliary column side facing surface 18 and the auxiliary beam side facing surface 28. When the auxiliary facing surface side fireproof covering material 70 is attached, the fireproof covering material 60 on the surface side is covered by the auxiliary facing surface side fireproof covering material 70, and the column-beam joint 30 is covered by the fireproof covering material 60 on the surface side and the auxiliary facing surface side fireproof covering material 70.

[0062] Then, as shown in Fig. 8, at the construction site, the remaining fireproof covering materials such as the column side fireproof covering material 40d, the auxiliary column side fireproof covering material 41d, the facing surface side fireproof covering material 61, and the auxiliary facing surface side fireproof covering material 71 are attached to the wooden column 10 and the wooden beam 20 to complete the fireproof covering of the column-beam joint 30.

[0063] Thus, in the fireproof covering method for the column-beam joint according to this embodiment, at the factory, the column side fireproof covering material 40 is attached to the wooden column 10, and the beam side fireproof covering material 50 is attached to the wooden beam 20. After joining the wooden beam 20 to the wooden column 10 at the construction site, the fireproof covering material 60 on the surface side is attached across the column side facing surface 17 of the wooden column 10 and the beam side facing surface 26 of the wooden beam 20. Therefore, the attachment work of the column side fireproof covering material 40 to the beam side fireproof covering material 50 to the wooden column 10 and the wooden beam 20 can be accurately performed at the factory, and the fireproof covering material 60 on the surface side can be attached to the column-beam joint 30 without providing a base material for attaching the fireproof covering material 60 on the surface side, so that the column-beam joint 30 can be easily covered with the fireproof covering material.

[0064] In addition, in the fireproof coating method for the column-beam joint according to the present embodiment, at the factory, in addition to the column-side fireproof coating material 40, the sub-column-side fireproof coating material 41 is attached to the wooden column 10, and in addition to the beam-side fireproof coating material 50, the sub-beam-side fireproof coating material 51 is attached to the wooden beam 20. After joining the wooden column 10 and the wooden beam 20 at the construction site, the sub-front surface side fireproof coating material 70 is attached across the sub-column side front surface 18 of the wooden column 10 and the sub-beam side front surface 28 of the wooden beam 20. Therefore, the operation of attaching the sub-column side fireproof coating material 41 to the sub-beam side fireproof coating material 51 to the wooden column 10 and the wooden beam 20 can be accurately performed at the factory, and the sub-front surface side fireproof coating material 70 can be easily attached to the column-beam joint 30 without providing a base material.

[0065] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist thereof.

Explanation of Reference Numerals

[0066] 1 Fireproof coating structure of column-beam joint 2 Building 3 Frame 10 Wooden column 11 Column-side joint surface 12 Column-side fitting 12a Column-side gusset plate 12b Support plate 12c Column-side joint 13 Groove 14 Column-side coated surface 15 Column-side coated surface 16 Column-side coated surface 17 Column-side front surface 18 Sub-column-side front surface 19 Deck support 20 Wooden beam 21 Beam-side joint surface 22 Beam-side fitting 22a Beam-side gusset plate 22b Support plate 23c Beam-side joint 23 Groove 24 Beam-side coated surface 25 Beam-side coated surface 26 Beam-side front surface 27 Side retaining surface of the beam 28 Side retaining surface of the secondary beam 29 Side retaining surface of the secondary beam 30 Column-beam joint 40 Fire-resistant coating material on the column side 40a Fire-resistant coating material on the column side 40b Fire-resistant coating material on the column side 40c Fire-resistant coating material on the column side 40d Fire-resistant coating material on the column side 41 Fire-resistant coating material on the secondary column side 41a Fire-resistant coating material on the secondary column side 41b Fire-resistant coating material on the secondary column side 41c Fire-resistant coating material on the secondary column side 41d Fire-resistant coating material on the secondary column side 50 Fire-resistant coating material on the beam side 50a Fire-resistant coating material on the beam side 50b Fire-resistant coating material on the beam side 50c Fire-resistant coating material on the beam side 51 Fire-resistant coating material on the secondary beam side 51a Fire-resistant coating material on the secondary beam side 51b Fire-resistant coating material on the secondary beam side 51c Fire-resistant coating material on the secondary beam side 60 Fire-resistant coating material on the retaining surface side 61 Fire-resistant coating material on the retaining surface side 70 Fire-resistant coating material on the secondary retaining surface side 71 Fire-resistant coating material on the secondary retaining surface side

Claims

1. A fireproof coating method for a column-beam joint where a wooden beam is joined to a wooden column, in a factory, a step of attaching a column-side fireproof coating material to a column-side covering surface perpendicular to the column-side joint surface where the wooden beam is joined to the wooden column, such that a column-side cutout surface where the column-side covering surface is exposed within a predetermined range from the side of the column-side joint surface is provided; in a factory, a step of attaching a beam-side fireproof coating material to a beam-side covering surface perpendicular to the beam-side joint surface where the wooden beam is joined to the wooden column, such that a beam-side cutout surface where the beam-side covering surface is exposed within a predetermined range from the side of the beam-side joint surface is provided; at a construction site, a step of joining the wooden beam with the beam-side fireproof coating material attached thereto to the wooden column with the column-side fireproof coating material attached thereto, using a column-side fitting attached to the column-side joint surface and a beam-side fitting attached to the beam-side joint surface, such that the column-side covering surface and the beam-side covering surface are in the same plane; at a construction site, after joining the wooden beam to the wooden column, a step of attaching a cutout surface-side fireproof coating material across the column-side cutout surface and the beam-side cutout surface to cover the column-side fitting and the beam-side fitting with the cutout surface-side fireproof coating material. A fireproof coating method for a column-beam joint, characterized by comprising these steps.

2. The fireproof coating method for a column-beam joint according to Claim 1, wherein the column-side fireproof coating material, the beam-side fireproof coating material, and the cutout surface-side fireproof coating material are each a water-resistant reinforced gypsum board.

3. in a factory, a step of attaching a sub-column-side fireproof coating material to the column-side fireproof coating material, such that a sub-column-side cutout surface where the surface of the column-side fireproof coating material is exposed within a predetermined range from the side of the column-side cutout surface is provided; in a factory, a step of attaching a sub-beam-side fireproof coating material to the beam-side fireproof coating material, such that a sub-beam-side cutout surface where the surface of the beam-side fireproof coating material is exposed within a predetermined range from the side of the beam-side cutout surface is provided; at a construction site, after attaching the cutout surface-side fireproof coating material across the column-side cutout surface and the beam-side cutout surface, a step of attaching a sub-cutout surface-side fireproof coating material across the sub-column-side cutout surface and the sub-beam-side cutout surface. The fireproof coating method for a column-beam joint according to Claim 1 or 2, further comprising these steps.

4. A fireproof coating structure for a column-beam joint where a wooden beam is joined to a wooden column, A column-side fireproof covering material is attached to a column-side covering surface perpendicular to a column-side joint surface of the wooden column where the wooden beam is joined, such that a column-side recessed surface where the column-side covering surface is exposed within a predetermined range from the side of the column-side joint surface is provided. A beam-side fireproof covering material is attached to a beam-side covering surface perpendicular to a beam-side joint surface of the wooden beam joined to the wooden column and having the same planar shape as the column-side covering surface, such that a beam-side recessed surface where the beam-side covering surface is exposed within a predetermined range from the side of the beam-side joint surface is provided. A fireproof covering structure for a column-beam joint portion, characterized by including a recessed surface-side fireproof covering material that is attached across the column-side recessed surface and the beam-side recessed surface and covers a column-side fitting attached to the column-side joint surface and a beam-side fitting attached to the beam-side joint surface and joined to the column-side fitting.

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