Penetration structure in fire-resistant wooden beams

Abstract

The present invention provides a penetration structure for fire-resistant wooden beams that allows for easy creation of through-holes for piping and wiring that traverse the beam, without causing splitting, and while being covered with a fire-stopping section. [Solution] The planar member 17 is installed so as to cover the upper surface of the fire-resistant wooden beam 11, with a rectangular cross-sectional notch groove 15 formed across the upper end portion of the fire-resistant wooden beam 11. By placing the planar member 17 on the upper surface of the fire-resistant wooden beam 11, a through hole 12 with a rectangular cross-sectional shape is provided so as to penetrate the joint between the fire-resistant wooden beam 11 and the planar member 17, with the bottom surface and both sides of the notch groove 15 and the lower surface of the planar member 17 serving as the upper, lower, left, and right inner wall surfaces. The fire-stopping portion 13 is attached so as to form the inner wall surface of the through hole 12, continuously covering the bottom surface and both sides of the notch groove 15.

Description

Technical Field

[0001] The present invention relates to a through-hole structure in a fire-resistant wooden beam, and particularly to a through-hole structure for providing a through-hole for piping and wiring across the fire-resistant wooden beam.

Background Art

[0002] Preferably, as part of the efforts towards a recycling-based society in recent years, for example, for mid-rise to high-rise buildings, it is recommended to construct them as wooden buildings using a large amount of wooden materials, such as wooden buildings or wooden hybrid structures combining wood and RC (reinforced concrete) structures. Wooden materials require less energy for processing compared to other materials, and their long-term use at multiple stages contributes to preventing global warming and forming a recycling-based society. Also, they can absorb carbon dioxide and fix carbon, and thus are attracting attention from the perspective of decarbonization.

[0003] On the other hand, when constructing a building using a large amount of wooden materials, various measures have been taken for wooden structural materials to have a predetermined fire resistance. For example, as a wooden beam which is a wooden structural material, a fire-resistant wooden beam has been proposed that covers at least the side surfaces and the bottom surface on both sides with a fire-resistant coating material serving as a fire-stopping layer (see, for example, Patent Document 1).

[0004] In addition, through-holes for passing equipment piping, equipment wiring, etc. may be formed in the wooden beam. However, when a through-hole is provided in the wooden beam, it is considered that the temperature of the wooden beam as a load-bearing part reaches the combustion temperature and burns due to flames and heat entering through the through-hole during a fire, resulting in a reduction in fire resistance. Therefore, technologies have also been developed to reduce the decrease in the fire resistance of the wooden beam due to the provision of the through-hole by preventing the flames and heat entering the through-hole from reaching the wooden beam and not burning the wooden beam which is a structural material (see, for example, Patent Document 2). The wooden beam in which the through-hole penetrates, described as a structural member in Patent Document 2, can reduce the decrease in the fire resistance of the wooden beam due to the formation of the through-hole by providing a fire-stopping part around the through-hole. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2022-63463 [Patent Document 2] Patent No. 6014320 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] However, in the wooden beam described as a structural member in Patent Document 2, the area around the through-hole is subjected to a considerable load as a structural member. Since the through-hole is formed in the middle of the wooden beam in the vertical direction, penetrating the beam in a direction that transverses it, the load applied makes it easy for the wooden beam to split around the formed through-hole. Furthermore, creating a fire-stopping area around the through-hole requires a lot of effort. For example, after installing a pipe member made of mortar or steel pipe into the through-hole, it is necessary to fill the gap between the inner surface of the through-hole and the outer surface of the pipe member with a fire-resistant material such as mortar or a wool-like material made of rock wool, or it is necessary to apply fire-resistant paint to the entire inner surface of the through-hole. For these reasons, there is a need for the development of a technology that allows for the easy creation of through-holes for piping and wiring that traverse fire-resistant wooden beams equipped with a fire-stopping layer, without causing cracks around the through-holes and without requiring much effort, while covering the inner surface with the fire-stopping layer.

[0007] The present invention aims to provide a penetration structure for fire-resistant wooden beams that allows for the easy creation of through-holes for piping and wiring, which are formed across fire-resistant wooden beams equipped with a fire-stopping layer, without causing cracks around the through-holes and without requiring much effort, while covering the inner surface with the fire-stopping layer. [Means for solving the problem]

[0008] The present invention relates to a penetration structure for a fire-resistant wooden beam, which has a vertically elongated rectangular cross-section and a fire-stopping layer is provided covering at least both sides and the bottom surface of the wooden beam, and to providing a penetration hole for piping and wiring across the beam, wherein a planar member is installed supported by the fire-resistant wooden beam so as to cover the entire upper surface of the fire-resistant wooden beam, and a notched groove with a rectangular cross-section is formed across the upper end portion of the fire-resistant wooden beam, and the planar member is placed on the upper surface of the fire-resistant wooden beam. The objective is achieved by providing a penetration structure for a fire-resistant wooden beam, wherein the through-hole, having a rectangular cross-sectional shape, is provided so as to penetrate the joint between the fire-resistant wooden beam and the planar member, with the bottom surface and both side surfaces of the notched groove and the bottom surface of the planar member forming the upper, lower, left, and right inner wall surfaces, and the fire-stopping portion is attached so as to continuously cover the bottom surface and both side surfaces of the notched groove by forming the inner wall surface of the through-hole.

[0009] Furthermore, in the fire-resistant wooden beam of the present invention, it is preferable that the penetration structure consists of the fire-stopping layer and the fire-stopping portion made of a fire-resistant covering material such as gypsum board.

[0010] Furthermore, in the penetration structure of the fire-resistant wooden beam of the present invention, it is preferable that the planar member is made of wooden flooring material and is attached so as to form the inner wall surface of the penetration hole, and that the fire-stopping portion is attached so as to continuously cover the bottom surface of the notched groove, the side surfaces on both sides, and the top surface with the lower surface of the planar member.

[0011] Furthermore, in the penetration structure of the fire-resistant wooden beam of the present invention, it is preferable that a wooden support member is provided at the upper end of the notched groove, allowing the wooden flooring material to be joined to the fire-resistant wooden beam at the portion of the notched groove, and that the fire-stopping portion is attached so as to cover the top surface of the notched groove with the lower surface of the wooden support member.

[0012] Furthermore, in the fire-resistant wooden beam of the present invention, it is preferable that a structural reinforcing member is installed to reinforce the portion of the notched groove, so as to straddle the upper side surfaces on both sides of the notched groove.

[0013] Furthermore, it is preferable that the penetration structure in the fire-resistant wooden beam of the present invention is provided with a steel support beam that is erected and positioned in the central part of the groove width direction of the notched groove and supports the planar member from below. [Effects of the Invention]

[0014] According to the penetration structure for fire-resistant wooden beams of the present invention, through-holes for piping and wiring formed across a fire-resistant wooden beam on which a fire-stopping layer is provided can be easily created without causing cracks around the through-hole and without requiring much effort, while covering the inner surface with the fire-stopping layer. [Brief explanation of the drawing]

[0015] [Figure 1] This is a partially broken perspective view illustrating the penetration structure in a fire-resistant wooden beam according to a preferred first embodiment of the present invention. [Figure 2] This is an enlarged side view of a key part illustrating the penetration structure in a fire-resistant wooden beam according to a preferred first embodiment of the present invention. [Figure 3] This is an explanatory diagram showing how the fire-stopping section is attached to the notched groove. [Figure 4] This is an enlarged side view of a key part illustrating the penetration structure in a fire-resistant wooden beam according to a preferred second embodiment of the present invention. [Figure 5] This is an enlarged side view of a key part illustrating the penetration structure in a fire-resistant wooden beam according to a preferred third embodiment of the present invention. [Figure 6] This is an enlarged side view of a key part illustrating the penetration structure in a fire-resistant wooden beam according to a preferred fourth embodiment of the present invention. [Figure 7] (a) to (d) are partial perspective views illustrating other structural reinforcement materials. [Figure 8] This is an enlarged side view of the main part illustrating the steel support beam that supports the planar member from below. [Figure 9] It is an enlarged side view of the main part explaining a reference example. [Figure 10] (a) and (b) are enlarged side views of the main part explaining other reference examples.

Mode for Carrying Out the Invention

[0016] The through-hole structure 10 in the fire-resistant wooden beam according to the preferred first embodiment of the present invention shown in FIG. 1 is, for example, in a mid-rise wooden building, the floor slab 17 of the upper floor which is also the ceiling slab of the lower floor is supported from below, preferably a fire-resistant wooden beam 11 that serves as an exposed beam is crossed, and a through-hole 12 for piping and wiring is provided in a state where the inner peripheral surface of the through-hole 12 is covered with a fire-stopping part 13. It is adopted as the structure of the through-hole part. The through-hole structure 10 of the present embodiment is formed by crossing a fire-resistant wooden beam 11 provided with a fire-stopping layer 14 around it, and the through-hole 12 for piping and wiring is formed in a state where the inner peripheral surface is covered with the fire-stopping part 13 without causing tearing around the through-hole and without requiring much labor, so that it can be easily formed.

[0017] And as shown in Fig. 2, the through-hole structure 10 in the fire-resistant wooden beam of the first embodiment is a structure of a through-hole for providing a through-hole 12 for piping and wiring, which crosses a fire-resistant wooden beam 11 in which a fire-stopping layer 14 is disposed so as to cover at least both side surface portions and the bottom surface portion of a wooden beam 11a having a vertically long rectangular cross-sectional shape. A planar member constituting the floor slab of the upper floor is installed so as to cover the entire upper surface portion of the fire-resistant wooden beam 11. A notch groove 15 having a rectangular cross-sectional shape is formed across the upper end portion of the fire-resistant wooden beam 11. Further, when a planar member 17 serving as a floor slab is placed on the upper surface portion of the fire-resistant wooden beam 11, a through-hole 12 having a rectangular cross-sectional shape, with the bottom surface portion and both side surface portions of the notch groove 15 and the lower surface portion of the planar member 17 serving as inner wall surface portions, is provided so as to penetrate the joint portion between the fire-resistant wooden beam 11 and the planar member 17. And a fire-stopping portion 13 is attached so as to continuously cover the bottom surface portion and both side surface portions of the notch groove 15 so as to form the inner wall surface portion of the through-hole 12.

[0018] Also, in the through-hole structure 10 of the first embodiment, the planar member 17 constituting the floor slab preferably consists of a wooden floor material such as a laminated veneer lumber (LVL) or a cross-laminated timber (CLT) for structures. A fire-stopping portion 13 is attached so as to continuously cover the bottom surface portion, both side surface portions, and the top surface portion formed by the lower surface portion of the planar member 17 so as to form the inner wall surface portion of the through-hole 12.

[0019] In this first embodiment, the wooden beam 11a constituting the fire-resistant wooden beam 11 can be formed using general timber such as pine, cypress, and cedar, as well as laminated timber such as structural sawn timber, structural laminated timber, structural veneer laminated lumber (LVL), and cross-laminated timber (CLT), and has a vertically elongated rectangular cross-sectional shape with a beam depth of approximately 300 to 1500 mm in the height direction and a beam width of approximately 105 to 315 mm in the left-right direction. The wooden beam 11a is firmly supported and erected between column members (not shown) by, for example, joining both ends to a pair of column members (not shown) using known connecting hardware. The fire-resistant wooden beam 11 is covered on both sides and the bottom surface of the wooden beam 11a by a plate-shaped fire-resistant covering material 16, preferably made of gypsum board, which is joined to it, for example, via adhesive, so that a fire-stopping layer 14 of the fire-resistant covering material 16 is provided around it, thereby exhibiting excellent fire resistance.

[0020] Furthermore, in this first embodiment, the through-hole 12 for piping and wiring, which is provided across the fire-resistant wooden beam 11, is formed by covering the upper opening surface of the notched groove 15, which is formed across the upper end portion of the fire-resistant wooden beam 11, with the lower surface of the planar member 17, which is placed on the upper surface of the fire-resistant wooden beam 11, so as to penetrate the joint portion between the fire-resistant wooden beam 11 and the planar member 17.

[0021] In other words, in this first embodiment, the notched groove 15 is formed to have a rectangular cross-sectional shape with an upper surface that is open as an upper end opening, and is for example about 150 to 600 mm in size when viewed from the side of the fire-resistant wooden beam 11. The upper end opening is covered by a planar member 17 placed on the upper surface of the fire-resistant wooden beam 11, so that a through hole 12 having a similar rectangular cross-sectional shape with an upper and lower width of about 50 to 500 mm when viewed from the side is formed at the joint between the fire-resistant wooden beam 11 and the planar member 17. Here, the rectangular cross-sectional shape of the notched groove 15 and the through hole 12 includes not only rectangles but also cross-sectional shapes that approximate a rectangle, such as rectangles with rounded corners.

[0022] Furthermore, in this first embodiment, a through hole 12 formed by covering the upper opening surface of the notched groove 15 with a planar member 17 is attached to the through hole 12, preferably a plate-shaped fire-resistant covering material 16 made of gypsum board, for example, via an adhesive, so as to form the inner wall surface of the through hole 12. The fire-stopping portion 13 made of the fire-resistant covering material 16 is attached so as to continuously cover the bottom surface and both side surfaces of the notched groove 15, as well as the top surface of the planar member (floor slab) 17, which is preferably constructed by placing an RC floor on a wooden formwork.

[0023] In other words, in this first embodiment, for example, once the fire-resistant wooden beam 11 is erected between a pair of column members (not shown), prior to supporting the erected fire-resistant wooden beam 11 and placing a planar member 17 that will become a floor slab on its upper surface, as shown in Figure 3, the work of joining and attaching a plate-shaped fire-resistant covering material 16, which is gypsum board, to the bottom surface and both sides of the notched groove 15 formed across the upper end portion of the fire-resistant wooden beam 11 can be easily and smoothly performed through the open upper end opening of the notched groove 15. Furthermore, after attaching the fire-resistant covering material 16 to the bottom surface and both sides of the notched groove 15, and then placing the planar member 17, which will become the floor slab on its upper surface, on the fire-resistant wooden beam 11 so as to cover the open upper end opening of the notched groove 15, the gypsum board, which is the plate-shaped fire-resistant covering material 16, can be easily and smoothly attached by working from the side of the fire-resistant wooden beam 11 to the top surface of the through hole 12 formed by the lower surface of the planar member 17 (see Figure 2).

[0024] As a result, a through-hole 12 having a rectangular cross-sectional shape is provided so as to penetrate the joint between the fire-resistant wooden beam 11 and the planar member 17, with the bottom surface and both side surfaces of the notched groove 15 and the bottom surface of the planar member 17 serving as the upper, lower, left, and right inner wall surfaces. Additionally, a fire-stopping section 13 is attached so as to continuously cover the bottom surface, both side surfaces, and top surface, forming the inner wall surface of the through-hole 12. This provides the through-hole structure 10 in the fire-resistant wooden beam of the first embodiment. Furthermore, piping and wiring 60, such as a duct for supply and exhaust, can be attached to the through-hole 12 provided by the through-hole structure 10 of the first embodiment so as to traverse the fire-resistant wooden beam 11 (see Figure 1).

[0025] Furthermore, according to the penetration structure 10 in the fire-resistant wooden beam of this first embodiment having the above configuration, it becomes possible to easily provide a through-hole 12 for piping and wiring that crosses the fire-resistant wooden beam 11 on which the fire-stopping layer 14 is provided, without causing splitting around the through-hole and without requiring much effort, while covering the inner surface with the fire-stopping portion 13.

[0026] In other words, according to this first embodiment, the notched groove 15 having a rectangular cross-sectional shape that forms the through hole 12 is provided across the upper end portion of the fire-resistant wooden beam 11, so as not to generate small stresses in the surrounding area with respect to shear and tensile forces that cause splitting failure, it is possible to effectively avoid causing splitting in the wooden beam 11a due to stress in the portion surrounding the through hole 12 formed by the notched groove 15.

[0027] Furthermore, according to this first embodiment, the notched groove 15 is formed by traversing the upper end portion of the fire-resistant wooden beam 11 and leaving the upper end surface open as an upper end opening. This makes it possible to smoothly attach and install a plate-shaped fire-resistant covering material 16, which is gypsum board, to the bottom surface and both side surfaces of the notched groove 15 via this upper end opening. This makes it possible to easily provide a through-hole 12 for piping and wiring with the inner circumferential surface covered by the fire-stopping portion 13 without requiring much effort.

[0028] Figure 4 illustrates a penetration structure 20 in a fire-resistant wooden beam according to a preferred second embodiment of the present invention. In the penetration structure 20 of the second embodiment shown in Figure 4, the planar member 21 placed on the upper surface of the fire-resistant wooden beam 11 so as to cover the upper end opening surface of the notched groove 15 is made of a precast reinforced concrete floor slab or an RC floor slab constructed on site. Furthermore, in the penetration structure 20 of the second embodiment shown in Figure 4, since the top surface of the penetration hole 12 made by the lower surface of the concrete floor slab (planar member) 21 itself has fire-resistant properties, the fire-stopping portion 13 made of gypsum board, which is preferably a plate-shaped fire-resistant covering material 16, is not attached to the top surface of the penetration hole 12, but is attached only to the bottom surface and both sides of the notched groove 15. The other configurations are the same as those of the first embodiment described above.

[0029] In the through-hole structure 20 of the second embodiment shown in Figure 4, the notched groove 15 that forms the through-hole 12 is formed across the upper end portion of the fire-resistant wooden beam 11, generating only small stresses in the surrounding area with respect to shear and tensile forces that cause splitting failure. Furthermore, the work of joining and attaching the plate-shaped fire-resistant covering material 16, which is gypsum board, to the bottom surface and both side surfaces of the notched groove 15 via the upper end opening surface of the notched groove 15 can be carried out smoothly, thus achieving the same effects as the through-hole structure 10 of the first embodiment described above.

[0030] Figure 5 illustrates a penetration structure 30 in a fire-resistant wooden beam according to a preferred third embodiment of the present invention. In the penetration structure 30 of the third embodiment shown in Figure 5, a wooden support member 33 is provided at the upper end of the notched groove 15, allowing a wooden flooring material 31, which is a planar member, to be joined to the fire-resistant wooden beam 11, for example, by a shear key 32. A fire-stopping section 13, preferably made of a plate-shaped fire-resistant covering material 16, such as gypsum board, is attached so as to cover the top surface of the notched groove 15 with the lower surface of the wooden support member 33. The other configurations are the same as those of the first embodiment described above.

[0031] In the third embodiment of the through-hole structure 30 shown in Figure 5, the notched groove 15 that forms the through-hole 12 is formed across the upper end portion of the fire-resistant wooden beam 11, generating only small stresses in the surrounding area with respect to shear and tensile forces that cause splitting failure. Furthermore, the work of joining and attaching the plate-shaped fire-resistant covering material 16, which is gypsum board, to the bottom surface and both side surfaces of the notched groove 15 via the upper end opening surface of the notched groove 15 can be carried out smoothly, thus achieving the same effects as the first embodiment of the through-hole structure 10 described above.

[0032] Figure 6 illustrates a penetration structure 40 in a fire-resistant wooden beam according to a preferred fourth embodiment of the present invention. In the penetration structure 40 of the fourth embodiment shown in Figure 6, a structural reinforcing member 42 is installed to reinforce the portion of the notched groove 15, straddling the upper side surfaces on both opposing sides of the notched groove 15. The structural reinforcing member 42 supports and reinforces the axial compressive force applied to the upper end portion of the fire-resistant wooden beam 11, for example, at the portion of the notched groove 15. In the penetration structure 40 of the fourth embodiment shown in Figure 6, the structural reinforcing member is a wooden plate-shaped reinforcing member 42, which is attached by fitting it into a stepped portion 15a formed at the upper end portion of the notched groove 15. Furthermore, a fire-stopping portion 13, preferably made of a plate-shaped fire-resistant covering material 16, such as gypsum board, is attached so as to cover the top surface of the notched groove 15 with the lower surface portion of the wooden plate-shaped reinforcing member 42. The other configurations are the same as those of the first embodiment described above.

[0033] In the fourth embodiment of the through-hole structure 40 shown in Figure 6, the notched groove 15 that forms the through-hole 12 is formed across the upper end portion of the fire-resistant wooden beam 11, generating only small stresses in the surrounding area in terms of shear and tensile forces that cause splitting failure. Furthermore, the work of joining and attaching the plate-shaped fire-resistant covering material 16, which is gypsum board, to the bottom and both sides of the notched groove 15 via the upper end opening surface of the notched groove 15 can be carried out smoothly, thus achieving the same effects as the first embodiment of the through-hole structure 10 described above.

[0034] Furthermore, in the through-hole structure 40 of the fourth embodiment, the structural reinforcing material installed to straddle the opposing upper side surfaces of the notched groove 15 can be replaced with a concrete thick plate-shaped reinforcing material 43, as shown in Figure 7(a), for example. In addition, the structural reinforcing material can also be a frame fitting 44 as shown in Figure 7(b), a U-shaped fitting 45 as shown in Figure 7(c), or an H-shaped reinforcing fitting 46 as shown in Figure 7(d).

[0035] Furthermore, in the present invention, as shown in Figure 8, a steel support beam 48 can be installed, preferably erected in the central part of the groove width direction of the notched groove 15, to support the planar member 47 from below. This makes it possible to ensure that the function of supporting the planar member 47 is not lost even when it is desired to secure a large groove width for the notched groove 15.

[0036] As an example, as shown in Figure 9, a notched groove 52 can be formed directly above the lower end of the beam end connector 51, crossing the upper end of the wooden beam 50. This allows for the formation of through-holes for wiring and piping between the wooden beam 50 and a planar member installed to cover its upper surface. This results in only small stresses around the notched groove 52 in terms of shear and tensile forces, which can cause splitting failure. Furthermore, since the notched groove 52 is provided crossing the upper end of the fire-resistant wooden beam 50, it effectively prevents the wooden beam 50 from splitting due to the stress generated around the formed notched groove 52. As shown in Figure 10(a), it is also possible to improve the fire resistance of the through-holes for wiring and piping formed by the notched groove 55 crossing the upper end of the wooden beam 54 using a ceiling surface member 53 formed from a fire-stopping layer. As shown in Figure 10(b), it is considered possible to improve the fire resistance of the through-holes for wiring and piping by covering the outer surface of the wooden beam 56 and the inner surface of the notched groove 57 that crosses its upper end with a burn-through layer 58.

[0037] It should be noted that the present invention is not limited to the embodiments described above and can be modified in various ways. For example, the planar member installed to cover the entire upper surface of the fire-resistant wood and to form a through hole with the notched groove does not necessarily have to be made of wooden flooring or concrete floor slabs, but may be any other planar member, such as one with a finishing function by applying a decorative material to the surface, one made of a composite structure in which the beam and floor are integrated by shear keys, or a combination of these. It may also be a roofing member such as a corrugated metal roof. The fire-stopping layer and the fire-stopping portion may be made of a known fire-resistant covering material other than gypsum board. Furthermore, the notched groove 15 may have a shape in which the bottom surface of the notched groove is inclined in the beam width direction in the beam cross-section when cut in the beam width direction.

[0038] 10, 20, 30, 40 Penetration structure in fire-resistant wooden beams 11 Fireproof wooden beams 11a wooden beam 12 Through holes for piping and wiring 13. Fire containment section 14. Fire-stopping layer 15 Notched grooves 16 Fireproof cladding 17,31 Planar members (wooden flooring) 21 Planar members (concrete slabs) 31 Wooden flooring 32 shear keys 33 Wooden support material 42, 43, 44, 45, 46 Structural reinforcement materials 47 Planar members 48 Steel bundle 60 Piping and wiring

Claims

1. A penetration structure in a fire-resistant wooden beam, which has a vertically elongated rectangular cross-section and is provided with a fire-stopping layer covering at least both sides and the bottom surface of the wooden beam, for providing a penetration hole for piping and wiring, The planar member is installed so as to cover the entire upper surface of the fire-resistant wooden beam, with the support of the fire-resistant wooden beam. A notched groove having a rectangular cross-sectional shape is formed across the upper end portion of the fire-resistant wooden beam, and the planar member is placed on the upper surface of the fire-resistant wooden beam, so that the through-hole having a rectangular cross-sectional shape, with the bottom surface and both side surfaces of the notched groove and the lower surface of the planar member forming the upper, lower, left, and right inner wall surfaces, is provided so as to penetrate the joint portion between the fire-resistant wooden beam and the planar member. A penetration structure in a fire-resistant wooden beam, wherein the fire-stopping portion is installed so as to form the inner wall surface of the through-hole, and so as to continuously cover the bottom surface and both side surfaces of the notched groove.

2. The penetration structure in a fire-resistant wooden beam according to claim 1, wherein the fire-stopping layer and the fire-stopping portion are made of a fire-resistant covering material such as gypsum board.

3. The fire-resistant wooden beam penetration structure according to claim 1 or 2, wherein the planar member is made of wooden flooring material and is attached so as to form the inner wall surface of the through-hole, and the fire-stopping portion is attached so as to continuously cover the bottom surface of the notched groove, the side surfaces on both sides, and the top surface formed by the lower surface of the planar member.

4. The penetration structure for a fire-resistant wooden beam according to claim 3, wherein a wooden support member is provided at the upper end of the notched groove, allowing the wooden flooring material to be joined to the fire-resistant wooden beam at the portion of the notched groove, and the fire-stopping portion is attached so as to cover the top surface of the notched groove with the lower surface of the wooden support member.

5. The penetration structure in a fire-resistant wooden beam according to claim 1 or 2, wherein a structural reinforcing member is installed to reinforce the portion of the notched groove, straddling the upper side portions on both sides of the notched groove.

6. The penetration structure in a fire-resistant wooden beam according to claim 1 or 2, wherein a steel support is installed, erected in the central part of the groove width direction of the notched groove, to support the planar member from below.

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