Beams and buildings

Abstract

To provide structure of a beam in which the motion in a joining condition of a concrete column or steel column with a wooden beam is similar to that of a pin joint in which the earthquake force is not easily borne, and a building in which the earthquake resistance is ensured using this beam.SOLUTION: A beam 2 has a wooden beam 21 arranged to oppose a column-beam joint part 11 of a concrete column 1, a projection part 22 projecting from the column-beam junction part 11 in the direction of the wooden beam 21, a base plate 23 attached to the surface of the projection part 22 on the side of the wooden beam 21, and a gusset plate 24 with a plate surface perpendicular to the width direction of the wooden beam 21 provided on the base plate 23 so as to project from the base plate 23 to the side of the wooden beam 21. The gusset plate 24 is inserted and fixed into a slit 21a provided on the side of the projection part 22 of the wooden beam 21.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a beam incorporating a wooden beam and a building using this beam. [Background technology]

[0002] BACKGROUND ART Conventionally, methods that use rod-shaped members such as fully threaded bolts or deformed reinforcing bars have been proposed as methods for joining concrete pillars and wooden beams (see, for example, Patent Document 1). In Patent Document 1, one end of a rod-shaped member is embedded in a joint of a concrete pillar, and the other end is inserted and fixed into an insertion hole provided in a wooden beam and extending in the axial direction of the wooden beam. This insertion hole is provided with a plurality of expansion filling grooves arranged at intervals in the axial direction of the insertion hole, and the rod-shaped member is fixed in the insertion hole by filling these expansion filling grooves with a filler such as epoxy resin. This joining method can increase the joining strength between the concrete pillar and the wooden beam. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-123628 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above Patent Document 1, the joint conditions between the concrete column and the wooden beam are close to a rigid joint, so when an earthquake force is applied, bending moments and shear forces also act on the wooden beam, and the durability of the wooden beam is not necessarily sufficient.

[0005] The present invention has been made in consideration of the problems of the past, and aims to provide a beam structure in which the joint between a concrete column or steel pipe column and a wooden beam moves in the same way as a pin joint, making it less susceptible to earthquake forces, and a building using this beam with ensured earthquake resistance. [Means for solving the problem]

[0006] The present invention relates to a beam joined to a concrete column or a steel column, and includes: a wooden beam arranged to face a column-beam joint of the concrete column; and a protrusion protruding from the column-beam joint toward the wooden beam. A rod-shaped member having one end embedded in the protruding portion and extending in the length direction of the wooden beam, and a rod-shaped member on the other end and a gusset plate provided on the base plate so as to protrude from the base plate toward the wooden beam, the plate surface of which is perpendicular to the width direction of the wooden beam, the gusset plate being inserted into a slit provided on the protruding portion side of the wooden beam, The rod-shaped members are arranged at a plurality of positions in the vertical direction of the protrusion, and the volume of the rod-shaped members arranged at the upper side is larger than the volume of the rod-shaped members arranged at the lower side. It is characterized by: In this way, the wooden beams are connected to the protruding parts in a pseudo-pin joint (which moves in the same way as a pin joint), which reduces the load on the beams during an earthquake and also reduces the amount of wooden components used. Concrete columns include reinforced concrete columns, steel pipe concrete columns, and reinforced steel concrete columns, and steel columns include steel pipe columns and steel frame columns. In addition, a rod-shaped member is provided with one end embedded in the protruding portion and extending in the longitudinal direction of the wooden beam, and the base plate is attached to the other end side of the rod-shaped member, so that the base plate can be securely attached to the protruding portion. Also, By arranging the rod-shaped members at multiple locations above and below the protrusion and making the volume of the upper rod-shaped members larger than the volume of the lower rod-shaped members, it is possible to reduce the deformation of the wooden beam that bears the long-term load, and therefore the cross-sectional area of ​​the wooden beam. In addition, the beam is configured to include a wooden beam placed opposite the column-beam joint of the concrete column or steel column, a protruding portion protruding from the column-beam joint toward the wooden beam, a rod-shaped member extending in the length direction of the wooden beam, one end of which is embedded in the protruding portion and the other end of which is embedded in the wooden beam, a base plate placed on the surface of the protruding portion facing the wooden beam, and a gusset plate that protrudes from the base plate toward the wooden beam and has a plate surface perpendicular to the width direction of the wooden beam.Therefore, the joining conditions (degree of fixation) between the wooden beam and the protruding portion can be freely set to pin, semi-fixed, or fixed. Furthermore, since wooden boards are attached to the side surfaces of the protruding portions, the beam can be made lighter and the diameter of the through holes used for ventilation and exhaust can be made smaller. Furthermore, since the beams are incorporated as sub-beams when constructing a building, the durability of the building can be ensured while reducing the load on the beams during an earthquake. [Brief explanation of the drawings]

[0007] [Figure 1] 3 is a diagram showing the structure of a beam according to the first embodiment. FIG. [Figure 2] 1 is a diagram showing an example of a building to which the beam of the present invention is applied. [Figure 3] FIG. 10 is a diagram showing the structure of a beam according to the second embodiment. [Figure 4] FIG. 10 is a diagram showing the structure of a beam according to the third embodiment. [Figure 5] 10A and 10B are diagrams showing other forms of beams of the present invention. [Figure 6] 10A and 10B are diagrams showing other forms of beams of the present invention. [Figure 7] 10A and 10B are diagrams showing other forms of beams of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0008] Embodiment 1 1(a) and (b) are diagrams showing the structure of a beam according to the first embodiment, where (a) is a longitudinal cross-sectional view and (b) is a transverse cross-sectional view. In each diagram, 1 is a column and 2 is a beam. Hereinafter, the vertical direction in Figure (a), which is the extension direction of column 1, will be referred to as the vertical direction, the left-right direction in Figure (a), which is the extension direction of beam 2, will be referred to as the front-rear direction, and the vertical direction in Figure (b), which is the width direction of beam 2, will be referred to as the left-right direction. Also, the column 1 side of beam 2 on the right side in Figures (a) and (b) will be referred to as the front side. The column 1 is made of reinforced concrete. However, the column 1 may also be made of concrete or steel pipe concrete, which is a steel pipe filled with concrete. The beam 2 includes a wooden beam 21, a protrusion 22, a base plate 23, a gusset plate 24, a drift pin 25, and an upper slab 26. The wooden beam 21 is a piece of wood with a rectangular cross section that is arranged opposite the beam-to-column joint 11 of the column 1 and extends in a direction perpendicular to the column 1 (front-to-back direction), and has a slit 21a and multiple drift pin insertion holes 21b formed on the column 1 side. The wooden beam 21 is joined to the protrusion 22 with a pin. The slit 21a is a groove that is rectangular in plan view and extends from the center of the width of the wooden beam 21 in the front-rear direction and opens to the column 1 side, and a gusset plate 24 is inserted into this slit 21a. The drift pin insertion hole 21b is a through hole extending in the left-right direction, and a drift pin 25 is driven into the drift pin insertion hole 21b. The protrusion 22 is a rectangular parallelepiped member made of reinforced concrete that protrudes from the column-beam joint 11 of the column 1 toward the wooden beam 21, and is constructed integrally with the column 1. Note that reference numeral 22h denotes a through hole used for ventilation and exhaust, and reference numeral 12 denotes beam reinforcement that is arranged when constructing the front and rear protrusions 22, 22 on the column 1. Further, other reinforcement arrangements for the column 1 and the protrusion 22 are omitted. Base plate 23 is a flat member made of steel plate attached to the surface of protruding portion 22 facing wooden beam 21, with its thickness direction perpendicular to the extension direction of wooden beam 21. In this example, base plate 23 is attached to protruding portion 22 by welding base plate 23 to the other end side (end side on the wooden beam 21 side) of fixing anchor bolt 27, which is a rod-shaped member with one end embedded in protruding portion 22 and extending in the length direction of wooden beam 21. In this example, one fixing anchor bolt 27 is provided at the center of the upper surface side and one at the center of the lower surface side of base plate 23, but they may also be provided at the four corners of base plate 23. 1(c), a recess 21s may be provided on the protruding portion 22 side of the wooden beam 21 as a receiving space for the fixing anchor bolt 27, and the fixing anchor bolt 27 may be passed through the base plate 23 and fixed to the base plate 23 at the recess 21s using a washer 27m and a nut 27n. Alternatively, the base plate 23 may be fixed to the protruding portion 22 with mortar or the like. The gusset plate 24 is a flat member made of steel plate with the plate surface perpendicular to the width direction of the wooden beam 21, and is fixed to the base plate 23 on the protruding portion 22 side by welding or the like. The gusset plate 24 is housed in a slit 21a formed in the wooden beam 21 and joined to the wooden beam 21 by a drift pin 25. The drift pin 25 is a rod-shaped member whose tip diameter is smaller than the diameter of the drift pin insertion hole 21b, and is driven into the drift pin insertion hole 21b of the wooden beam 21 to join the gusset plate 24 and the wooden beam 21 together. The upper slab 26 is made of reinforced concrete poured on top of the wooden beams 21 and the protrusions 22 after the wooden beams 21 and the protrusions 22 are joined.

[0009] Next, a method for constructing the beam 2 of the present invention will be described. First, when constructing the column 1, the protrusion 22 is constructed at the column-beam joint 11 of the column 1. Then, after one end of the fixing anchor bolt 27 is embedded in the protruding portion 22, the base plate 23 to which the gusset plate 24 has been attached in advance is attached to the other end of the fixing anchor bolt 27 by welding or the like. Next, after inserting the gusset plate 24 into the slit 21 a of the wooden beam 21 , the drift pin 25 is driven into the drift pin insertion hole 21 b to pin-join the wooden beam 21 to the protruding portion 22 . Finally, a formwork is provided above the wooden beams 21 and the protruding portions 22, and concrete is poured into the formwork to construct the upper slab 26. Alternatively, a gusset plate unit may be prepared in advance by attaching a base plate 23 to which a gusset plate 24 has already been attached by welding or the like to the other end of the fixing anchor bolt 27, and the fixing anchor bolt 27 of this gusset plate unit may be set at the planned location for pouring concrete in the protruding portion 22 before pouring concrete in the protruding portion 22, and then the concrete in the protruding portion 22 may be poured.

[0010] As described above, the beam 2 of the present invention has a wooden beam 21 that is integrally constructed with the column 1 and pin-connected to the protruding portion 22 that is rigidly connected to the column 1. Therefore, when an earthquake or other force is applied, the wooden beam 21 does not generate a bending moment and deforms accordingly. In other words, although the protruding portion 22 and the column 1 are rigidly connected, the beam 2 functions as a sub-beam as a whole. Therefore, if the beam 2 is used as a sub-beam in a building, wooden members can be incorporated into the structure in locations that are advantageous for sale, such as premium residences. This ensures earthquake resistance while reducing the amount of wood used compared to using wood only for finishing materials. 2 is a diagram showing an example of a building 3 to which the beam 2 of the present invention is applied. The building 3 is composed of a three-story section 31 and a seven-story section 32. The three-story section 31 is composed entirely of reinforced concrete frames, joists, and slabs, similar to a typical reinforced concrete apartment building. Meanwhile, the seven-story section 32 is composed of reinforced concrete frames, joists, and slabs, similar to the third-story section 31, up to the fourth floor (4F). From the fourth floor (4F) onwards, the columns 33 are reinforced concrete columns, and the beams 34 are beams 2 equipped with wooden beams 21 of the present invention. The rooftop section 35 is composed of a slab that is thicker than the ceiling sections of each floor. This allows the beams 34 on the fourth floor and above to be small beams that are pin-joined to the RC columns (columns 33) without using hinges.

[0011] Embodiment 2 3(a) and (b) are diagrams showing the structure of a beam 2A according to the second embodiment, where (a) is a vertical cross-sectional view and (b) is a horizontal cross-sectional view. The beam 2A includes a wooden beam 21A, a protrusion 22, a base plate 23, a gusset plate 24, a drift pin 25, an upper slab 26, and a connecting anchor bolt 28. The wooden beam 21A is the same as the wooden beam 21 of the first embodiment except that, in addition to the slits 21a and the drift pin insertion holes 21b, an anchor bolt insertion hole 21c is formed on the side of the column 1. Furthermore, the parts with the same reference numerals as those of the first embodiment, such as the protrusion 22, have the same configuration as those of the first embodiment, and therefore their description will be omitted. The joining anchor bolt 28 is a rod-shaped member having one end embedded in the protruding portion 22 and the other end embedded in the wooden beam 21A, extending in the longitudinal direction of the wooden beam 21, and joins the wooden beam 21A to the protruding portion 22. The other end of the joining anchor bolt 28 is inserted into the anchor bolt insertion hole 21c formed on the column 1 side, and is fixed to the anchor bolt insertion hole 21c with an adhesive. In this example, one joining anchor bolt 28 is provided at the center of the upper surface side and one at the center of the lower surface side of the protruding portion 22 . The rod-shaped member joining the wooden beam 21A and the protrusion 22 is not limited to the joining anchor bolt 28, and may be a reinforcing bar or a steel rod. However, it is preferable to use the joining anchor bolt 28, as this provides a higher degree of connection with the protrusion 22 and the wooden beam 21A. In this example, the width dimension (length dimension in the vertical direction) of the gusset plate 24 is smaller than that of the first embodiment. Specifically, the width dimension is set so that the gusset plate 24 is disposed inside the two joining anchor bolts 28. Note that the width dimension of the gusset plate 24 may be made longer, for example, so as to be the same as that of the first embodiment. In that case, it goes without saying that the joining anchor bolts 28 are disposed so as to pass between the drift pins 25. In this way, in the beam 2A of this example, the wooden beam 21A is pin-joined to the protruding portion 22 and also joined by the joining anchor bolt 28. This allows the joining conditions (degree of fixation) between the wooden beam 21A and the protruding portion 22 to be freely set to pin, semi-fixed, or fixed. Specifically, if the width dimension of the gusset plate 24 is increased and the diameter of the joining anchor bolts 28 is reduced, the joining conditions will be closer to a pin joint; conversely, if the width dimension of the gusset plate 24 is reduced and the diameter of the joining anchor bolts 28 is increased or the number of joining anchor bolts 28 is increased, the joining conditions will be closer to a fixed state.

[0012] Embodiment 3 4(a) and (b) are diagrams showing the structure of a beam 2B according to the third embodiment, where (a) is a vertical cross-sectional view and (b) is a horizontal cross-sectional view. The beam 2B includes a wooden beam 21B, a protruding portion 22B, and a joining anchor bolt . The wooden beam 21B is the same as the wooden beam 21A of embodiment 2 except that the slit 21a and the plurality of drift pin insertion holes 21b are not formed, and a notch 21k is formed at the bottom on the protrusion 22B side. The protruding portion 22B is provided with an extension portion 22k that extends the lower portion toward the wooden beam 21B, and the wooden beam 21B is provided with a notch 21k for accommodating the extension portion 22k. As in embodiment 2, the joining anchor bolt 28 is a rod-shaped member with one end embedded in the protruding portion 22 and the other end embedded in the wooden beam 21, and in this example, two are provided on the upper side of the extension portion 22k to join the wooden beam 21B and the protruding portion 22B. In this way, in the beam 2B of this example, the upper side of the wooden beam 21B is joined by a joining anchor bolt 28, so the joining conditions (degree of fixation) between the wooden beam 21B and the protrusion 22B can be freely set to pin, semi-fixed, or fixed. Specifically, if the thickness of the extension 22k is increased or the installation position of the joining anchor bolt 28 is moved upward, the joining conditions become closer to a pin joining state. Conversely, if the thickness of the extension 22k is decreased, the diameter of the joining anchor bolt 28 is increased, or the number of joining anchor bolts 28 is increased, the joining conditions become closer to a fixed state.

[0013] Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various modifications and improvements can be made to the above embodiments. It is clear from the claims that such modifications and improvements can also be included within the technical scope of the present invention.

[0014] For example, in the first embodiment, the width of the protruding portion 22 of the beam 2 is the same as that of the wooden beams 21, 21A, and 21B. However, as shown in the side view of FIG. 5(a) and the cross-sectional view of FIG. 5(b), the width of the protruding portion 22 may be made shorter than that of the wooden beam 21, and a finishing material 29 such as a wooden board may be attached to the side of the protruding portion 22. Because wood has lower rigidity than reinforced concrete, the wooden beam 21 made of wood can be sufficiently supported even if the width of the protruding portion 22 made of reinforced concrete is made smaller. This allows the weight of the beam 2 to be reduced. The beams 2A and 2B shown in the second and third embodiments may also be configured to have finishing materials attached thereto. 5(c), if there is no protrusion 22 and the wooden beam 21 is directly joined to the column 1, a fire-resistant coating according to the fire-resistance time is required when forming the through hole 22h' in the wooden beam 21. Therefore, if the thickness of the fire-resistant coating layer shown by the diagonal lines in the figure is d, the diameter φ' of the through hole 22h' is φ' = φ + 2d, where φ is the required diameter. In contrast, in a configuration in which finishing materials 29 are attached to both widthwise sides of the protruding portion 22, the inside of the finishing materials 29 (protruding portion 22) is made of concrete, so a fire-resistant coating layer for the through-hole 22h is not required. Therefore, it is possible to provide a through-hole 22h with a small diameter φ, as shown in Figure 5(d).

[0015] In addition, in the first embodiment, the length dimension of the fixing anchor bolt 27 provided at the center of the upper surface of the base plate 23 is the same as the length dimension of the fixing anchor bolt 27 provided at the center of the lower surface. However, as shown in FIG. 6(a), if the length dimension of the fixing anchor bolt 27a on the upper surface side is made greater than the length dimension of the fixing anchor bolt 27b on the lower surface side, the amount of deflection of the wooden beam 21 that bears the long-term load can be reduced, and therefore the cross-sectional area of ​​the wooden beam 21 can be reduced. To reduce the amount of deflection of the wooden beam 21, the total cross-sectional area of ​​the upper-side fixing anchor bolts 27a may be made larger than the total cross-sectional area of ​​the lower-side fixing anchor bolts 27b. Alternatively, both the length dimension and cross-sectional area of ​​the upper-side fixing anchor bolts 27a may be made larger than the total length dimension and cross-sectional area of ​​the lower-side fixing anchor bolts 27b. In short, the amount of deflection of the wooden beam 21 can be reduced by making the volume of the upper-side fixing anchor bolts 27a larger than the volume of the lower-side fixing anchor bolts 27b. In this example, one fixing anchor bolt 27 is provided at the center of the top surface side and one at the center of the bottom surface side, but if there are a plurality of top surface side fixing anchor bolts 27a and a plurality of bottom surface side fixing anchor bolts 27b, the total cross-sectional area of ​​all of the top surface side fixing anchor bolts 27a among the plurality of top surface side fixing anchor bolts 27a does not need to be larger than the total cross-sectional area of ​​any of the bottom surface side fixing anchor bolts 27b among the bottom surface side fixing anchor bolts 27b; it is sufficient if the sum of the total cross-sectional areas of all top surface side fixing anchor bolts 27a is larger than the sum of the total cross-sectional areas of all bottom surface side fixing anchor bolts 27b. Furthermore, with regard to the joining anchor bolt 28 of the second embodiment shown in Fig. 3, if the length of the joining anchor bolt 28a on the upper surface side is made longer than the length of the joining anchor bolt 28b on the lower surface side, as shown in Fig. 6(b), the durability of the wooden beam 21 can be improved. In the same figure, the length on the protruding portion 22 side is made longer, but if both the length on the protruding portion 22 side and the length on the wooden beam 21A side are made longer, as shown in Fig. 6(c), the amount of deflection of the wooden beam 21 can be further reduced. Note that when only one of the length on the protruding portion 22 side and the length on the wooden beam 21A side is made longer, it is preferable to make the length on the protruding portion 22 side longer. It should be noted that with regard to the joining anchor bolt 28 of embodiment 3 shown in FIG. 4, the same effect can be obtained by making the length of the joining anchor bolt 28a on the upper surface side longer than the length of the joining anchor bolt 28b on the lower surface side, as shown in FIG. 6(d).

[0016] In the first to third embodiments, the column 1 is a reinforced concrete column, but as shown in Figures 7(a) and 7(b), the column 1 may be a steel column. In this case, the protruding portion protruding from the column-beam joint 11 toward the wooden beam 21 is also made of steel material such as a steel rod or steel plate. Hereinafter, the steel column will be referred to as column 3, and the protrusion made of steel material such as steel rod or steel plate will be referred to as protrusion 4. Here, the column 3 is made of a square steel pipe. A square steel pipe is a tubular member with a rectangular cross section and a hollow interior, and is made of steel. However, the column 3 may also be made of a round steel pipe or an H-shaped steel. The protruding portion 4 includes upper and lower diaphragms (through diaphragms) 41a, 41b, an H-shaped steel 42 as a protruding member, front and rear fixing plates 43a, 43b, reinforcing plates 44a, 44b, and upper and lower connecting rods 45a, 45b. The upper and lower diaphragms 41a, 41b and the square steel pipe (column 3) are integrated by butt welding or the like. The end of the H-shaped steel 42 on the column 3 side is integrated with the upper and lower diaphragms 41a, 41b by butt welding or the like, and the end on the wooden beam 21 side is connected to the upper and lower ends of the base plate 23 by welding or the like. Specifically, the H-shaped steel 42 is arranged so that its extension direction is perpendicular to the surface of the column 3 on the wooden beam 21 side, and the upper flange 42a of the H-shaped steel 42 is welded to the upper diaphragm 41a and the upper end of the base plate 23, and the lower flange 42b is welded to the lower diaphragm 41b and the lower end of the base plate 23, respectively. The front and rear fixing plates 43a, 43b are iron plates whose surface is perpendicular to the surface of the wooden beam 21, and both ends are attached to the inside of the upper and lower flanges 42a, 42b of the H-shaped steel pipe 42, respectively. The fixing plates 43a and 43b are disposed on the left and right sides of the web 42c of the H-shaped steel pipe 42, and the ends of the connecting rods 45a and 45b on the column 3 side are fixed to the fixing plates 43a and 43b. The fixing plate 43b may be omitted, and only one fixing plate may be used. The reinforcing plates 44a and 44b are iron plates whose plate surfaces are vertically aligned and are arranged between the fixed plates 43a and 43b to connect the fixed plates 43a and 43b and reinforce the fixed plates 43a and 43b.

[0017] The upper and lower connecting rods 45a, 45b are rod-shaped members having the same function as the anchor bolts 27 for attaching the base plate 23 to the protruding portion 22 in the first embodiment. In this example, the upper and lower connecting rods 45a, 45b are made of steel rods or the like and are arranged on the left and right sides of the web 42c of the H-shaped steel material 42. As described above, the column 3-side ends of the connecting rods 45a, 45b are fixed to the front and rear fixing plates 43a, 43b with nuts 46. Note that, although the connecting rods 45a, 45b are fixed to the front and rear sides of the fixing plates 43a, 43b with nuts 46 in FIGS. 7(a) and 7(b), the nuts 46 may be fixed only to the front or rear sides of the fixing plates 43a, 43b. The ends of the connecting rods 45a and 45b on the wooden beam 21 side pass through the base plate 23 and are fixed to the base plate 23 with nuts 47 on the column 3 side and the wooden beam 21 side of the base plate 23. As a result, the base plate 23 and the gusset plate 24 are fixed to the protruding portion 4. In Figure 7(b), in order to secure space 47s for fastening nuts 47 on the wooden beam 21 side, the width of the wooden beam 21 is made narrower than the distance between the left and right connecting rods 45a (or connecting rods 45b). However, as shown in Figure 7(c), by providing recesses 21s on the protruding portion 4 side of the wooden beam 21 as receiving space for the connecting rods 45a, 45b and fixing the connecting rods 45a, 45b in the recesses 21s with nuts 47, the width of the wooden beam 21 can be made wider than the distance between the left and right connecting rods 45a (or connecting rods 45b). The space 47s will be later provided with a fire-resistant coating 47K. [Explanation of symbols]

[0018] 1 column, 2 beams, 11 column-beam joints, 12 beam bars, 21 wooden beam, 21a slit, 21b drift pin insertion hole, 21s recess, 22 protrusion, 23 base plate, 24 gusset plate, 25 Drift pin, 26 Upper slab, 27 Fixing anchor bolt, 27m washer, 27n nut.

Claims

1. a wooden beam placed against a beam-to-column joint of a concrete or steel column; a protruding portion protruding from the column-beam joint portion toward the wooden beam; a rod-shaped member having one end embedded in the protruding portion and extending in the length direction of the wooden beam; a base plate attached to the other end of the rod-shaped member; The base plate is provided with a protruding portion on the wooden beam side. A gusset plate whose plate surface is perpendicular to the width direction of the wooden beam; Equipped with The gusset plate is inserted into a slit provided on the protruding portion side of the wooden beam, A beam characterized in that the rod-shaped members are arranged at multiple locations in the vertical direction of the protrusion, and the volume of the rod-shaped members arranged on the upper side is larger than the volume of the rod-shaped members arranged on the lower side.

2. a wooden beam placed against a beam-to-column joint of a concrete or steel column; a protruding portion protruding from the column-beam joint portion toward the wooden beam; a rod-shaped member extending in the length direction of the wooden beam, one end of which is embedded in the protruding portion and the other end of which is embedded in the wooden beam; a base plate disposed on the surface of the protrusion facing the wooden beam; a gusset plate provided so as to protrude from the base plate toward the wooden beam, the plate surface of which is perpendicular to the width direction of the wooden beam; The gusset plate is inserted into a slit provided on the protruding portion side of the wooden beam, A beam characterized in that the rod-shaped members are arranged at multiple locations in the vertical direction of the protrusion, and the volume of the rod-shaped members arranged on the upper side is larger than the volume of the rod-shaped members arranged on the lower side.

3. a wooden beam placed against a beam-to-column joint of a concrete or steel column; a protruding portion protruding from the column-beam joint portion toward the wooden beam; a rod-shaped member extending in the length direction of the wooden beam, one end of which is embedded in the protruding portion and the other end of which is embedded in the wooden beam; A beam receiving portion that protrudes toward the wooden beam is provided on the lower end side of the protruding portion, A beam characterized in that the rod-shaped members are arranged at multiple locations in the vertical direction of the protrusion, and the volume of the rod-shaped members arranged on the upper side is larger than the volume of the rod-shaped members arranged on the lower side.

4. The beam according to any one of claims 1 to 3, characterized in that a wooden board is attached to the side of the protruding portion.

5. A building incorporating the beam according to any one of claims 1 to 4 as a sub-beam.

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