JP2022118425A - Beam floor junction structure - Google Patents

Abstract

To provide a beam floor junction structure for a wooden beam and a floor slab made of cast-in-place concrete, which can be easily formed and can secure stable shear capacity in a stable state.SOLUTION: A beam floor junction structure 10 for integrally joining a wooden beam 11 with a concrete floor slab 12 formed by installing cast-in-place concrete on a top surface of the wooden beam includes shear force transmission means for transmission between the wooden beam and the concrete floor slab. The shear force transmission means is formed so as to include: a shear cotter surface part 15 that is formed on a top surface of the wooden beam and has a saw blade-like cross-sectional shape in which a plurality of protrusions 15a having a triangular cross-sectional shape succeeds along an axial direction of the wooden beam; and an engagement lower surface part having a plurality of engagement protrusions that is formed on a lower surface part of the concrete floor slab by installed concrete having solidified after entering recesses 15b among the protrusions having the triangular cross-sectional shape of the shear cotter surface part and individually engages with the plurality of protrusions of the shear cotter surface part.SELECTED DRAWING: Figure 1

Description

The present invention relates to a beam-to-floor joint structure, and more particularly to a beam-to-floor joint structure for integrally joining a wooden beam and a concrete floor slab formed by pouring cast-in-place concrete on the upper surface of the wooden beam. Regarding.

For example, in middle- and low-rise buildings, it is common for wooden buildings to be built using wood for the entire frame, and for reinforced concrete buildings, the entire frame to be built using concrete. be. In recent years, it has become possible to form structural members with large cross-sections by using laminated lumber, preferably made of wood, so it has become possible to construct larger buildings as wooden buildings. However, on the other hand, even when laminated lumber is used, there is a limit to how large a building can be built using lumber alone.

For this reason, by combining a structural part made of wood and a structural part made of concrete, a building with a composite structure of wood and concrete that combines the increased strength of concrete and the warmth of the exterior and interior of wood. Various things have been developed. As a composite structure of such a building, for example, a beam-to-floor joint structure has been proposed, in which exposed wooden beams are supported, and a concrete floor slab is provided on the upper surface of the exposed beams. A technique has also been developed to facilitate the integration of the wooden beams and the floor slab by forming the floor slab provided on the upper surface of the wooden beam using cast-in-place concrete (for example, Patent Documents 1 to 3 reference). For example, by using exposed wooden beams, it is possible to provide a space with a wooden feel, and concrete floor slabs are effective in ensuring livability such as noise and floor vibrations on the upper and lower floors. Furthermore, the development of wooden beams with fire resistance has made it possible to use wooden beams even in properties subject to fire resistance restrictions.

In addition, in the beam-to-floor joint structure between a wooden beam and a floor slab made of cast-in-place concrete described in Patent Documents 1 to 3, the force in the shear direction along the joint between the wooden beam and the concrete floor slab is In order to transmit between members, grooves are provided on the upper surface of the wooden beams that intersect in plan view, and these grooves are filled with cast-in-place concrete and solidified (see Patent Document 1), or on the upper surface of the wooden beams Cast-in-place concrete is placed by involving hardened cement with unevenness fixed via a lag screw (see Patent Document 2), or a steel plate or steel bar is protruded from the upper surface of a wooden beam to form these. By placing cast-in-place concrete so as to involve the steel material (see Patent Document 3), the shear strength can be ensured.

Japanese Patent No. 5930609 Japanese Patent No. 6010430 Japanese Patent No. 6592958

However, in the beam-to-floor joint structure of wooden beams and floor slabs made of cast-in-place concrete described in Patent Documents 1 to 3, the work of processing intersecting grooves on the upper surface of the wooden beams in plan view and cement hardening with unevenness The work of forming the body and the work of processing and attaching steel plates and steel bars require a lot of time and effort, and at the same time, it is possible to ensure shear strength in a more stable state over a long period of time. Development of a new beam-to-floor joint structure is desired.

The present invention provides a beam-to-floor joint between a wooden beam and a floor slab made of cast-in-place concrete, which can be easily formed without much labor and can secure shear strength in a more stable state over a long period of time. It is intended to provide structure.

In order to achieve the above object, the beam-to-floor joint structure according to the present invention is for integrally joining a wooden beam and a concrete floor slab formed by placing cast-in-place concrete on the upper surface of the wooden beam. The beam-to-floor joint structure has a shear force transmission means provided at the joint between the wooden beam and the concrete floor slab for transmitting a force in a shear direction along the joint between these members. The shear force transmission means is a shea cotter having a saw-toothed cross-sectional shape in which a plurality of triangular cross-sectional protrusions formed on the upper surface of the wooden beam continue along the axial direction of the wooden beam. A plurality of shea cotter surface portions formed on the lower surface portion of the concrete floor slab by entering and solidifying the placed concrete in the recesses between the surface portion and the triangular cross-sectional protrusions of the shea cotter surface portion and a meshing lower surface portion having a plurality of meshing projections each meshing with the projections.

According to the beam-to-floor joint structure of the wooden beam and the floor slab made of cast-in-place concrete of the present invention, it can be easily formed without requiring much labor, and the shear strength can be secured in a more stable state over a long period of time. can do.

1A) A schematic front view of the beam-to-floor joint structure according to the first embodiment of the present invention, (b) a top view of a wooden beam, and (c) a schematic cross-sectional view along A-A'. It is a cross-sectional schematic diagram for demonstrating the shape of the shea cotter surface of the beam-floor joint structure which concerns on 1st Embodiment of this invention. (a) Front view schematic diagram, (b) top view of a wooden beam, and (c) cross-sectional schematic diagram along AA' of a beam-floor joint structure according to a modification of the first embodiment of the present invention. . FIG. 4A is a schematic front view of a beam-to-floor joint structure according to a second embodiment of the present invention, FIG. 4B is a top view of a wooden beam, and FIG. FIG. 13A is a schematic front view of a beam-to-floor joint structure according to a third embodiment of the present invention, (b) is a top view of a wooden beam, and (c) is a schematic cross-sectional view along AA′. FIG. 4A is a schematic front view of a beam-floor joint structure according to a fourth embodiment of the present invention, (b) is a top view of a wooden beam, and (c) is a schematic cross-sectional view along AA'. FIG. 4 is a cross-sectional view of a beam-to-floor joint structure according to another preferred embodiment of the present invention; FIG. 5 is a cross-sectional view of a beam-to-floor joint structure according to still another preferred embodiment of the present invention;

[First Embodiment]
FIG. 1 shows (a) a schematic front view of the beam-to-floor joint structure according to the present embodiment, (b) a top view of the wooden beam (before concrete is poured), and (c) a schematic cross-sectional view along AA'. is. FIG. 2 is (a) a schematic cross-sectional view and (b) a partially enlarged schematic cross-sectional view for explaining the shape of the shear cotter surface of the beam-to-floor joint structure according to the present embodiment.

For example, as shown in FIG. 1A, the beam-to-floor joint structure 10 includes a wooden beam 11 and a concrete floor slab 12 formed by pouring cast-in-place concrete on the upper surface of the wooden beam 11 as an integral unit. It is a joining structure for joining. A beam-to-floor joint structure 10 is provided at a joint between a wooden beam 11 and a concrete floor slab 12 .

The wooden beam 11 is a wooden member that supports a load. The wooden beams 11 can be formed using wooden beams made of various materials, which are known as structural woods constituting a frame structure. The wooden beams 11 are preferably made of laminated wood obtained by laminating a plurality of plate materials lumbered from small-diameter logs via an adhesive, as described in Japanese Unexamined Patent Application Publication No. 2007-268731. can be formed by The wooden beam 11 is made of structural lumber having a width of, for example, about 45 mm to 200 mm, which is generally distributed as structural lumber, and is used alone or by overlapping in the width direction. The wooden beam 11 is, for example, a rectangular shape having a horizontal width (horizontal width) of about 45 mm to 1500 mm and a vertical width (vertical width) of about 90 mm to 1500 mm. (including square) cross-sectional shape. Also, the wooden beam 11 is formed to have a length of about 3000 mm to 15000 mm, for example. The wooden beam 11 is supported at both ends by another wooden beam member extending in a direction perpendicular thereto and by a pillar member, and is mounted in a state of being bridged between these members.

The concrete floor slab 12 is a plate for making a floor structure and supporting a load perpendicular to the surface, and is made of concrete. The concrete floor slab 12 is made of, for example, reinforced concrete. The concrete floor slab 12 is formed by pouring concrete forming the concrete floor slab 12 onto the upper surface of the wooden beam 11 by casting on site, and hardening the poured concrete into the shea cotter surface part 15 of the wooden beam 11. is integrated with Thereby, a shear force transmitting means is provided at the joint between the wooden beam 11 and the concrete floor slab 12 . The shear force transmission means transmit shear force along the joint between the two members, namely between the wooden beam 11 and the concrete floor slab 12 .

As the cast-in-place concrete to be placed on the upper surface of the wooden beam 11, various known fluidized concretes that have not yet hardened and are used in construction work can be used. The cast-in-place concrete can be, for example, temporary formwork shoring erected in the area between each adjacent wooden beam 11, or reinforcing bars as appropriate above deck plates erected between each adjacent wooden beam 11. After the bars are arranged, they are cast to a predetermined thickness and solidified to form a concrete floor slab 12 of a predetermined thickness.

The shear force transmission means provided at the joint between the wooden beam 11 and the concrete floor slab 12 to transmit the force in the shear direction along this joint between these members consists of the shear cotter surface portion 15 and the meshing lower surface portion 14 and a section-widened concrete portion 13 . The shea cotter surface portion 15 has a saw-toothed cross-sectional shape in which a plurality of triangular cross-sectional convex portions 15 a formed on the upper surface of the wooden beam 11 are continuous along the axial direction X of the wooden beam 11 . Shea cotter is a joint that can be caught by pouring concrete into the dented portion later, and is used to join and integrate two members such as concrete and wood, or concrete floor slab and steel beam. As such, a shear cotter is a member that resists the shear forces that occur at the joint of two members.

The shea cotter surface portion 15 has a sawtooth-shaped cross-sectional shape in which a plurality of triangular cross-sectional convex portions 15a are continuous along the axial direction X of the wooden beam 11, so that the entire upper surface of the wooden beam 11 (or The bottom surface of the concrete floor slab 12) can be used as a shear failure surface. As a result, the beam-to-floor joint structure 10 is more resistant to shearing of the shear failure surface than the conventional beam-to-floor joint structure in which only a protrusion (or a “rectangular cross-sectional convex portion”) is formed on the upper surface of the wooden beam 11. Since the effective length (area) can be gained, it is possible to obtain a greater shear strength.

As shown in FIG. 2 , the triangular cross-sectional convex portions 15 a that constitute the shea cotter surface portion 15 have a pitch (d, d′) between the top portions 15 e of adjacent convex portions 15 a that is in the axial direction X of the wooden beam 11 . It is continuous along the axial direction X of the wooden beam 11 with both end portions being narrower than the central portion. That is, the projections 15a have a narrow pitch (d = 50 to 500 mm) at the end of the wooden beam 11, and the pitch (d' = 500 to 1500 mm) widens as it approaches the central portion, and approaches the end again. The shape is such that the pitch (d) becomes narrower as the distance increases.

The convex portion 15a constituting the shea cotter surface portion 15 is inclined at a gentle slope (θ ₁ =5 to 30°) from the top portion 15e and at a steep slope (θ ₂ =60 to 90°) from the top portion 15e. It has a triangular cross-sectional shape with a steep slope portion 15c. A convex portion 15a having a triangular cross-sectional shape having a gently inclined surface portion 15d and a steeply inclined surface portion 15c is provided in a state in which the steeply inclined surface portion 15c faces the central portion side of the wooden beam 11. As shown in FIG. As a result, the shear force at the interface works in the direction perpendicular to the gradient, and the direction in which the wooden beam 11 and the concrete floor slab 12 tend to separate can be reduced.

When a vertical load is applied to the concrete floor slab 12, a shear force is generated along the joint between the wooden beam 11 and the concrete floor slab 12. becomes larger at the ends. Therefore, by narrowing the pitch (d) of both end portions, the resistance to the shearing force is increased.

The meshing lower surface portion 14 is formed on the lower surface portion of the concrete floor slab 12 by solidifying the poured concrete into the concave portions 15b between the triangular cross-sectional convex portions 15a of the shea cotter surface portion 15. Shea cotter. It has a plurality of meshing protrusions that mesh with the plurality of protrusions 15 a of the face portion 15 . In other words, when concrete is poured into the wooden beam 11 having the shea cotter surface 15 and placed, the shape of the shea cotter surface 15 is formed on the side of the meshing lower surface 14 that faces the shea cotter surface 15 of the concrete floor slab 12. Concavo-convex shape corresponding to is formed. Of these uneven shapes, the recesses correspond to the meshing protrusions. That is, the portion of the shea cotter surface portion 15 that fits in the concave portion serves as the meshing convex portion.

A lag screw 16 is driven into the wooden beam 11 . The lag screw 16 is a metal bar-shaped hardware that is driven from above toward the shear cotter surface portion 15 formed on the upper surface of the wooden beam 11 . The lag screw 16 is embedded in the concrete floor slab 12 while standing upward from the shear cotter surface portion 15 . That is, as shown in FIG. 1( c ), the lag screw 16 has a head portion protruding above the shea cotter surface portion 15 , and a thread portion thereof is screwed into the wooden beam 11 .

The lag screw 16 is driven in to prevent the concrete floor slab 12 from peeling, that is, to strengthen the integration of the wooden beam 11 and the concrete floor slab 12 . Although the number and positions of the lag screws 16 to be driven are not limited, in this embodiment, two lag screws are driven into each of the gently inclined surface portions 15d of the shea cotter surface 15 symmetrically with respect to the center line of the axial direction X of the wooden beam 11. is Further, a plurality of lag screws 16 may be attached at predetermined intervals in the axial direction X of the wooden beam 11 . Here, the lag screw 16 is a metal piece having a nut-type head in the form of a wood screw. Note that if the lag screw 16 is tightened as it is, there is a risk of splitting the wood, so tighten it after drilling a pilot hole. A hexagonal head shape is the mainstream.

In the above description, an example in which the concrete floor slab 12 does not have the cross-sectionally widened concrete portion 13 was used, but as shown in FIG. 13, the present invention can be applied. As illustrated, the cross-sectional widened concrete portion 13 is integrally continuous with the concrete that has entered the recesses 15b between the projections 15a of the shea cotter surface portion. That is, the section-widened concrete portion 13 is provided so as to sandwich the upper portion of the wooden beam 11 from both sides of the wooden beam 11 . Here, generally, the shear strength of concrete is about 1/10 of the compressive strength, and may be smaller than the compressive strength and the shear strength of wood. Therefore, there is a possibility that the concrete floor slab 12 will crack at the portion where the wooden beam 11 and the concrete floor slab 12 mesh. Therefore, in order to increase the cross-sectional area of the concrete floor slab 12 and increase the resistance to the shearing force, the cross-sectional widened concrete portion 13 is provided.

According to this embodiment, the joint structure between the wooden beam and the concrete floor slab can be easily formed without requiring much labor. Furthermore, the beams made of wood and the floor slabs made of concrete, which are materials with different physical properties, can be firmly bonded together, and the shear resistance in the direction along the joint can be ensured in a more stable state over a long period of time. . In addition, it is possible to construct a building having a composite structure of wood and concrete, which combines the increased strength of concrete with the warmth of the exterior and interior of wood. Furthermore, since the wooden beams 11 and the concrete floor slabs 12 are combined, beams can be reduced. Furthermore, by arranging the shear cotter according to the shear force, the processing time can be reduced. Since the rigidity of the shearing force transmission means is increased, the rigidity of the wooden beams 11 and the concrete floor slab 12 is improved, and comfort against noise and floor vibration is improved.

[Second embodiment]
Next, a beam-to-floor joint structure according to a second embodiment of the present invention will be described with reference to FIG. FIG. 4 shows (a) a schematic front view of the beam-to-floor joint structure according to the present embodiment, (b) a top view of a wooden beam, and (c) a schematic cross-sectional view along AA'. The beam-to-floor joint structure according to this embodiment differs from the first embodiment in that it has a covering layer. Since other configurations and operations are the same as those of the first embodiment, the same configurations and operations are denoted by the same reference numerals, and detailed description thereof will be omitted.

The wooden beam 21 is a fireproof beam having a load bearing layer 21a and a covering layer 21b. The load support layer 21a serves as a load-bearing portion. The covering layer 21b is formed of a covering material surrounding both side surfaces and the lower surface of the load supporting layer 21a. The coating layer 21b is a so-called flammable layer.

Here, the load supporting layer 21a is made of, for example, Japanese larch or Douglas fir, but is not limited to these. The covering material forming the covering layer 21b is also made of Japanese larch, Douglas fir, or the like, like the load supporting layer 21a.

According to this embodiment, in addition to the effects of the above embodiment, since the coating layer 21b is provided, a beam-to-floor joint structure having fire resistance can be obtained.

[Third Embodiment]
Next, a beam-to-floor joint structure according to a third embodiment of the present invention will be described with reference to FIG. FIG. 5 shows (a) a schematic front view of the beam-to-floor joint structure according to the present embodiment, (b) a top view of a wooden beam, and (c) a schematic cross-sectional view along AA′. The beam-to-floor joint structure according to this embodiment differs from the first and second embodiments in that it has a coating layer and a decorative material. Since other configurations and operations are similar to those of the first and second embodiments, the same configurations and operations are denoted by the same reference numerals, and detailed description thereof will be omitted.

The wooden beam 31 is a fireproof beam including a load bearing layer 21a, a coating layer 31a and a decorative material 31b. The covering layer 31a is formed of a covering material made of flame-retardant chemical-infused wood surrounding both side surfaces and the lower surface of the load-bearing layer 21a. Here, the flame-retardant agent-injected lumber is, for example, flame-retardant agent-injected cedar, but is not limited thereto.

The decorative material 31b surrounds the side and bottom surfaces of the covering layer 31a. The decorative material 31b is wood used for visible parts such as pillars, floorboards, and lintels.

According to this embodiment, in addition to the effects of the above embodiments, it is fireproof and has a good appearance, and can be used for indoor pillars, floorboards, rafters, lintels, and the like.

[Fourth Embodiment]
Next, a beam-to-floor joint structure according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 6 is (a) a schematic front view of the beam-to-floor joint structure according to the present embodiment, (b) a top view of the wooden beam, and (c) a schematic cross-sectional view along AA'. The beam-to-floor joint structure according to the present embodiment differs from the first to third embodiments in that it has a reinforced gypsum board, a side covering material, a decorative material, and a reinforcing steel material. Since other configurations and operations are the same as those of the first to third embodiments, the same configurations and operations are denoted by the same reference numerals, and detailed description thereof will be omitted.

The wooden beam 41 is a fireproof beam including a load bearing layer 21a, a side surface covering material 41b, a lower surface covering layer 41a, and a decorative material 41c. The load-bearing layer 21a serves as a load-bearing portion and is made of, but not limited to, larch or red pine.

The side covering material 41b is a covering material made of wood covering both side surfaces of the load supporting layer 21a. The side covering material 41b is made of larch, for example, but is not limited to this. The lower surface covering layer 41a is a covering material made of a reinforced gypsum board that covers the lower surface of the load supporting layer 21a. The decorative material 41c is a piece of wood surrounding both side surfaces and the lower surface of the lower surface covering layer 41a.

The reinforcing steel members 17 are attached at intervals in the axial direction X of the wooden beam 41, which is the beam extending direction, so as to straddle the upper surfaces of the side covering layers on both sides of the load supporting layer 21a. The reinforcing steel material 17 is embedded in the concrete floor slab 12 . The shea cotter surface portion 15 is in a divided state at the portion where the reinforcing steel material 17 is attached. The reinforcing steel material 17 is integrally fixed to the upper surface of the wooden beam 41 while dividing the shea cotter surface portion 15 .

According to this embodiment, in addition to the effects of the above embodiment, it is possible to provide a beam-to-floor joint structure that has high fire resistance and that can be assembled easily and quickly. Further, since the reinforcing steel material 17 is provided in the axial direction X of the wooden beam 41, the load supporting layer and the wood covering the side surfaces on both sides are not separated, which facilitates manufacturing and construction at the site. In addition, when pouring concrete in a still fluid state on the floor, the forms such as deck plates and half PCa plates can be placed on the wood covering both sides without being placed on the load-bearing layer.

It should be noted that the present invention can be modified in various ways without being limited to the above embodiments. For example, in the beam-to-floor joint structure of the third embodiment, the reinforcing steel material that straddles the coating layers on both sides of the load support layer can be used by being attached so as to straddle the upper surfaces of the coating layers that will be the burning margin layers on both sides. can be done. As shown in FIGS. 7 and 8, the wooden beams 51 having lag screws 16 at their joints with the concrete floor slab have a wooden load-bearing layer 21a and two sides of the load-bearing layer 21a in one direction Y. and a embers layer fixed to the outside of each of the first covering members 51a in one direction Y via spacers 51b so as to have a gap 51d between the first covering member 51a and the first covering member 51a. 51c and a second covering member 51e covering one or both sides of the load bearing layer 21a in the orthogonal direction Z, wherein the second covering member 51e in the orthogonal direction Z on one or both sides, A corner reinforcing member 51f is arranged on the outer surface side of each of the first covering members 51a. The corner reinforcing member 51f partially narrows the one-directional length of the gap 51d or partially eliminates the gap 51d. It can be anything that exists.

10, 20, 30, 40, 50 Beam-floor joint structure 11 Wooden beam 12 Concrete floor slab 13 Cross-sectional widened concrete portion 14 Engagement lower surface portion 15 Shea cotter surface portion 15a Protruding portion 15b Concave portion 15c Steeply inclined surface portion 15d Gentle inclined surface portion 15e Top portion 16 Lug Screw 17 Reinforcement steel material 21 Wooden beam 21a Load supporting layer 21b Covering layer 31 Wooden beam 31a Covering layer 31b Decorative material 41 Wooden beam 41a Lower surface covering layer 41b Side covering material 41c Decorative material 51 Wooden beam 51a First covering member 51b Spacer 51c Burning Blank layer 51d Gap 51e Second covering member 51f Corner reinforcing member X Axial direction Y of wooden beam One direction Z Orthogonal direction

Claims (11)

A beam-to-floor joint structure for integrally joining a wooden beam and a concrete floor slab formed by placing cast-in-place concrete on the upper surface of the wooden beam,
a shear force transmission means provided at a joint between the wooden beam and the concrete floor slab for transmitting a force in a shear direction along the joint between these members,
The shear force transmission means includes a shea cotter surface portion having a saw-toothed cross-sectional shape in which a plurality of triangular cross-sectional convex portions are continuous along the axial direction of the wooden beam, formed on the upper surface of the wooden beam; and a plurality of the projections of the shea cotter surface portion formed on the lower surface portion of the concrete floor slab by entering and solidifying the placed concrete into the recesses between the projections of the triangular cross section of the shea cotter surface portion; and a meshing lower surface portion having a plurality of meshing protrusions that mesh with each other. A cross-sectionally widened concrete portion formed continuously in the axial direction along each side portion on both sides of the upper end portion of the wooden beam and integrally continuous with at least the concrete that has entered the concave portion between the convex portions of the shea cotter surface portion. The beam-to-floor joint structure according to claim 1, which is formed by comprising: A metal rod-shaped hardware driven from above toward the shea cotter surface formed on the upper surface of the wooden beam is embedded in the concrete floor slab with its upper part erected upward from the shea cotter surface. The beam-floor joint structure according to claim 1 or 2. The triangular cross-sectional projections constituting the shea cotter surface portion are axially arranged such that the pitch between the tops of adjacent projections is narrower at both end portions than at the axial center portion of the wooden beam. The beam-to-floor joint structure according to any one of claims 1 to 3, which is continuous along. 5. Any one of claims 1 to 4, wherein the convex portion constituting the shea cotter surface portion has a triangular cross-sectional shape having a gently inclined surface portion gently inclined from the top portion and a steeply inclined surface portion steeply inclined from the top portion. 1. Beam-floor joint structure according to 1. 6. The projection according to claim 5, wherein the convex portion having a triangular cross-sectional shape having the gently sloping surface portion and the steeply sloping surface portion is provided with the steeply sloping surface portion facing the central portion side of the wooden beam. Beam-floor joint structure. 7. The wooden beam according to any one of claims 1 to 6, wherein the wooden beam is a fire-resistant beam comprising a load-bearing layer serving as a load-bearing portion, and a covering layer of a covering material surrounding both side surfaces and a lower surface of the load-bearing layer. 2. Beam-floor joint structure according to item 1. The wooden beam includes a load-bearing layer that bears the load, a coating layer made of flame-retardant chemical-infused wood surrounding both side surfaces and the bottom surface of the load-bearing layer, and side surfaces and the bottom surface of the coating layer. The beam-to-floor joint structure according to any one of claims 1 to 6, wherein the fire-resistant beam is provided with a decorative material surrounding the . The wooden beams are composed of a load-bearing layer that bears the load, a side covering material made of wood that covers both side surfaces of the load-bearing layer, and a reinforced gypsum board that covers the lower surface of the load-bearing layer. The beam-floor joint according to any one of claims 1 to 6, wherein the fire-resistant beam is provided with a lower surface covering layer made of a covering material and decorative materials made of wood surrounding both side surfaces and the lower surface of the lower surface covering layer. structure. Reinforcing steel members are embedded in the concrete floor slab so as to straddle the upper surfaces of the side covering layers on both sides of the load bearing layer and are attached at intervals in the extending direction of the beam, 10. The beam-to-floor joint structure according to claim 9, wherein the shear cotter surface portion is integrally fixed to the upper surface of the wooden beam in a divided state at the portion to which the reinforcing steel material is attached. The wooden beam comprises a wooden load-bearing layer, an incombustible first covering member covering both sides of the load-bearing layer in one direction of the cross section, and outside each of the first covering members in the one direction, A wooden embers layer fixed via a spacer so as to have a gap between the first covering member and a second covering covering one side or both sides of the load bearing layer in the orthogonal direction orthogonal to the one direction a fire resistant wooden structural member comprising: a noncombustible corner reinforcing member disposed on the outer surface of each first covering member on one or both sides having a second covering member in the orthogonal direction; The corner reinforcing member is arranged in a state in which a part or the whole of the corner reinforcing member overlaps the outer surface of the first covering member, and in a state in which a part extends from one end of the load supporting layer in the orthogonal direction. The beam-floor joint according to any one of claims 1 to 6, wherein the partial reinforcing member partially narrows the one-way length of the gap or partially eliminates the gap. structure.

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