Junction structure

Abstract

To provide a beam-column junction structure or the like which enables easy construction.SOLUTION: In a junction structure 1 for joining a wooden column 2 and a wooden beam 4 by a junction 3 made of concrete, a joint metal 8 is provided at the end of the wooden beam 4 on the junction 3 side, a perforated steel plate dowel 84 is buried in the junction 3 so as to project from the joint metal 8 to the horizontal midway of the junction 3, and horizontal reinforcements 10 are connected in the junction 3 by a joint part 11 so as to project from the wooden beams 4 on both sides of the junction 3.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a column-beam joint structure and the like. [Background technology]

[0002] In a wooden rigid frame structure using wooden columns and wooden beams, the wooden columns and wooden beams are sometimes joined via concrete joints (joints).

[0003] Patent Document 1 describes how the joint is connected to the wooden beams on either side of it by protruding metal fittings on both sides of the joint, how these protruding metal fittings are connected to each other by a through bolt embedded in the joint, and how for the wooden columns above and below the joint, threaded reinforcing bars of steel rods are embedded in these wooden columns, and the deformed reinforcing bars of the steel rods protruding from the wooden columns are connected to both ends of the deformed reinforcing bars embedded in the joint by reinforcing bar joints. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6638905 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the above-mentioned joint structure, the number of through bolts in the joint is large, and construction is time-consuming. There has been a demand for a structure for column-beam joints that solves this problem and allows easy construction.

[0006] The present invention has been made in consideration of the above problems, and an object of the present invention is to provide a column-beam joint structure that can be easily constructed. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the present invention provides a joint structure in which a pillar and a wooden beam are joined by a concrete joint, characterized in that a joint metal is provided at the end of the wooden beam on the joint side, a shear resistance member protruding from the joint metal halfway horizontally to the joint is embedded in the joint, and horizontal reinforcing bars protruding from the wooden beam on both sides of the joint are connected by coupling parts within the joint.

[0008] In the present invention, when a column and a wooden beam are joined through a concrete joint, a joint metal is provided at the end of the wooden beam on the joint side, and a shear resistance member protruding from the joint metal is embedded in the concrete of the joint. In addition, horizontal reinforcing bars protruding from the wooden beams on both sides of the joint are connected by joints within the joint. By transmitting shear force between the wooden beam and the joint using the above-mentioned joint metal, it is not necessary to place a large number of through bolts or horizontal reinforcing bars within the joint, which simplifies the configuration within the joint and makes construction easier. In addition, in the present invention, since the horizontal reinforcing bars protruding from the wooden beam are connected by joints, it is not necessary to move one wooden beam in the beam axial direction to insert the horizontal reinforcing bars protruding from the wooden beam into the hole of the other wooden beam, and the wooden beam can be installed by simply dropping it from above, making construction easier.

[0009] The shear resistance members are preferably perforated steel plate dowels arranged along the vertical direction. In this case, the shear force can be transmitted reliably through the shear resistance of the concrete at the joint that is filled into the holes in the perforated steel plate dowel, and the structure of the shear resistance member also has high strength and rigidity.

[0010] It is also desirable that a shear resistant member be embedded in the joint, protruding from the column below the joint halfway in the vertical direction of the joint. By transmitting shear forces between the column and the joint using the above-mentioned shear resistance member, there is no need to place a large number of vertical rebars, etc. within the joint, which simplifies the structure within the joint and makes construction easier.

[0011] It is also desirable that a vertical reinforcing bar that is continuous between the columns above and below the joint is arranged to pass through the joint. Regarding the vertical reinforcing bars, by arranging a single vertical reinforcing bar continuously between the upper and lower columns, it is not necessary to connect the vertical reinforcing bars to each other within the joints using mechanical joints or the like, making construction easier.

[0012] The joint metal has, for example, an end plate provided on the end face of the wooden beam and a joint plate embedded in the end of the wooden beam on the joint side, and the horizontal reinforcing bar penetrates the end plate. It is also preferable that the joint metal further has flanges joined to the upper and lower ends of the end plate and disposed on the upper and lower surfaces of the end of the wooden beam on the joint side. The connecting metal can be securely connected to the wooden beam by the above-mentioned connecting plate, and the upper and lower flanges can support both the long-term load applied to the wooden beam and the shear force during an earthquake.

[0013] It is also desirable that a slab be provided above the joint, and a protrusion protruding from the slab be embedded in a column above the slab. This allows shear forces to be transmitted between the columns above the slab and the slab, making it possible to reduce the number of vertical reinforcing bars, etc. Effect of the Invention

[0014] According to the present invention, it is possible to provide a column-beam joint structure that can be easily constructed. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 shows a joint structure 1. [Diagram 2] A diagram showing the connecting metal fitting 8. [Diagram 3] 1A to 1C are diagrams showing a method of constructing the joint structure 1. [Figure 4] FIG. 2 is a diagram showing a joint structure 1a. [Diagram 5] A diagram showing the connecting metal fitting 8a. [Figure 6] FIG. [Figure 7]FIG. 4 is a diagram showing a method for constructing the joint structure 1b. [Figure 8] FIG. 1C is a diagram showing a joint structure 1c. [Figure 9] A diagram showing connecting metal fitting 8c. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0017] [First embodiment] (1.Joint structure 1) Fig. 1(a) is a diagram showing a joint structure 1 according to a first embodiment of the present invention. This joint structure 1 joins a wooden column 2 and a wooden beam 4 via a concrete joint 3. Fig. 1(b) is a vertical cross section of the wooden beam 4, and Fig. 1(c) is a horizontal cross section of the joint 3. Figs. 1(b) and (c) correspond to the cross sections taken along lines AA and BB in Fig. 1(a), respectively. Also, Fig. 1(a) corresponds to the cross section taken along line CC in Fig. 1(c).

[0018] The wooden pillar 2 is a pillar made of a wooden material, and the wooden beam 4 is a beam made of a wooden material. As the wooden material, LVL (Laminated Veneer Lumber), CLT (Cross Laminated Timber), BP material, laminated timber, etc. can be used, but are not particularly limited.

[0019] The wooden column 2 has a rectangular cross section perpendicular to the axial direction (hereinafter simply referred to as the cross section), and is configured with a fire-retardant layer 22 provided around a load-bearing part 21 located in the center of the cross section. The fire-retardant layer 22 is made of wood material impregnated with a chemical agent.

[0020] The wooden beam 4 also has a similar fire-retardant layer 42 provided around the load-bearing portion 41 located in the center of the rectangular cross section. However, the upper surface of the load-bearing portion 41 is in contact with the slab 5, and the fire-retardant layer 42 is omitted.

[0021] In the joint structure 1, wooden columns 2 are placed above and below the joint 3. The plane of the joint 3 is rectangular, and its dimensions correspond to the cross-sectional dimensions of the wooden columns 2. The concrete of the joint 3 is continuous with the concrete of the slab 5 provided above, and the upper wooden column 2 is placed on the slab 5.

[0022] Both ends of a vertical reinforcing bar 6 that is continuous with the upper and lower wooden columns 2 are embedded in the ends on the joint 3 side. The vertical reinforcing bar 6 is arranged so as to penetrate the joint 3 and the slab 5, and is embedded in the concrete of the joint 3 and the slab 5. The vertical reinforcing bar 6 may be a deformed reinforcing bar or a threaded reinforcing bar, but there is no need to switch between the deformed reinforcing bar section and the threaded reinforcing bar section midway, as in Patent Document 1.

[0023] Both ends of the vertical reinforcing bars 6 are joined to the load-bearing parts 21 of the upper and lower wooden columns 2 by GIR (Glued in Rod) joining. GIR (Glued in Rod) joining is a joining method in which the ends of the vertical reinforcing bars 6 are inserted into holes formed in the load-bearing parts 21 and the holes are filled with adhesive. As shown in FIG. 1(c), the vertical reinforcing bars 6 are arranged in a total of eight locations, which correspond to the corners of the rectangle and the center of each side of the rectangle in plan, and hoops 7 are embedded in the concrete of the joint 3 so as to surround these vertical reinforcing bars 6. The hoops 7 are arranged in multiple stages with intervals between them vertically.

[0024] The lower part of the circular steel pipe 9 is embedded in the upper surface of the load-bearing part 21 of the lower wooden pillar 2. The upper part of the circular steel pipe 9 protrudes in a convex shape from the load-bearing part 21 to partway in the vertical direction of the joint 3, and this protrusion (shear resistance member) is embedded in the concrete of the joint 3, making it possible to transmit shear force between the joint 3 and the wooden pillar 2 below it.

[0025] The circular steel pipe 9 is also embedded in the upper surface of the slab 5, and the upper part of the circular steel pipe 9 protrudes in a convex shape from the slab 5. By inserting this protrusion into the load-bearing part 21 of the upper wooden column 2, it becomes possible to transmit shear force between the slab 5 and the wooden column 2 above it.

[0026] The wooden beams 4 are disposed on both the left and right sides of the joint 3. Metal joints 8 are provided at the ends of the left and right wooden beams 4 on the joint 3 side. The metal joints 8 have the function of temporarily supporting the shear force of the wooden beams 4 and transmitting this force to the joint 3.

[0027] 2 is a diagram showing the metal joint 8. The metal joint 8 is formed by combining steel plates and the like, and has an end plate 81, a joint plate 82, a flange 83, a perforated steel plate dowel 84, and the like.

[0028] The end plate 81 is a plate material arranged along the end face of the load-bearing part 41 of the wooden beam 4 on the joint 3 side. The joint plate 82 and the flange 83 are plate materials that protrude from the end plate 81 toward the wooden beam 4, and the joint plate 82 is arranged in the center of the width direction of the end plate 81 with the plate surface in the vertical direction. The flange 83 is a horizontal plate material joined to the upper and lower ends of the end plate 81 and the joint plate 82.

[0029] The joint metal 8 is arranged at the end of the load support part 41 on the joint 3 side by passing the horizontal reinforcing bars 10 protruding from the load support part 41 of the wooden beam 4 through the holes 811 in the end plate 81 and inserting the joint plate 82 into the slit 411 in the beam axis direction formed in the load support part 41. At this time, the hole 821 in the joint plate 82 and the hole 413 in the width direction of the wooden beam 4 in the load support part 41 are continuous. The drift pin 85 is arranged through these holes 821, 413, and the joint metal 8 is fixed to the end of the load support part 41 on the joint 3 side.

[0030] The flanges 83 are placed in recesses 412 provided above and below the load support portion 41. The upper and lower flanges 83 are provided to support the long-term load of the wooden beam 4 and shear forces during earthquakes, and the shear forces received by these flanges 83 are transmitted to the perforated steel plate dowels 84 via the connecting plates 82. By providing the recesses 412, the upper and lower flanges 83 can be placed in the same plane as the upper and lower surfaces of the load support portion 41, but it is also possible to omit the recesses 412 and place the upper and lower flanges 83 above and below the load support portion 41.

[0031] The perforated steel dowel 84 transmits the above-mentioned shear force to the joint 3. The perforated steel dowel 84 is a plate material that protrudes from the end plate 81 halfway in the horizontal direction of the joint 3, and is disposed in the center of the end plate 81 in the width direction with the plate surface oriented vertically.

[0032] The perforated steel dowel 84 is embedded in the joint 3, and holes 841 (see FIG. 1(a)) of the perforated steel dowel 84 are filled with concrete of the joint 3. The perforated steel dowel 84 functions as a shear resistance member that transmits shear force by the shear resistance of the concrete. The perforated steel dowel 84 is placed only in the middle part in the height direction of the end plate 81, which reduces the amount of steel material compared to when it is placed over the entire height of the end plate 81.

[0033] One end of the horizontal reinforcing bar 10 is GIR-jointed to the end of the load-bearing part 41 of the wooden beam 4 on the joint 3 side, and the other end passes through a hole 811 in an end plate 81 of a joint metal 8 and protrudes into the concrete of the joint 3. The tips of the horizontal reinforcing bars 10 protruding from the wooden beams 4 on the left and right sides of the joint 3 are connected by a joint 11 within the joint 3, as shown in Fig. 1(a). The joint 11 can be a mechanical joint, but is not limited to this.

[0034] (2. Construction method of joint structure 1) To construct the joint structure 1, the lower wooden column 2 is constructed on-site, and then the left and right wooden beams 4, to which connecting metals 8 and horizontal reinforcing bars 10 have been attached in advance, are dropped from above as shown by the arrows in Fig. 3(a) and placed on top of the lower wooden column 2 as shown in Fig. 3(b). The vertical reinforcing bars 6 and circular steel pipes 9 are fixed in advance to the upper ends of the load-bearing parts 41 of the lower wooden column 2. The connecting metals 8 and horizontal reinforcing bars 10 are attached to the wooden beams 4 on-site, but may also be attached in advance in a factory or the like.

[0035] When installing the wooden beam 4, the end of the lower flame-retardant layer 42 on the joint 3 side is placed on the flame-retardant layer 22 of the wooden column 2. This prevents the lower flame-retardant layer 42 of the wooden beam 4 from peeling off from the load support part 41 due to gravity. In addition, the upper surface of the flame-retardant layer 22 of the wooden column 2 is located lower than the upper surface of the load support part 21, and when the wooden beam 4 is installed, the upper surface of the load support part 21 and the upper surface of the lower flame-retardant layer 42 of the wooden beam 4 are at the same height.

[0036] Thereafter, as shown in Figure 3(b), the tips of the horizontal rebars 10 of the left and right wooden beams 4 are connected with joints 11, and after the hoops 7 and other components are placed, concrete is poured into the joint 3 and slab 5 as shown in Figure 3(c). A circular steel pipe 9 is embedded in the top surface of the slab 5. In addition, the end plates 81 of the joint metal fittings 8 function as formwork when pouring the concrete into the joint 3, so when it is time to pour the concrete into the joint 3, it is only necessary to place the remaining necessary formwork.

[0037] Thereafter, as shown by the arrow in Fig. 3(c), the upper wooden column 2 is dropped from above the slab 5, and the upper ends of the horizontal reinforcing bars 10 protruding from the slab 5 and the circular steel pipes 9 are inserted into the holes 211 and notches 212 formed in the load-bearing parts 21 of the wooden column 2. The holes 211 are filled with adhesive, thereby forming the joint structure 1 shown in Fig. 1(a) etc.

[0038] In this way, in this embodiment, when the wooden column 2 and the wooden beam 4 are joined via the concrete joint 3, the joint metal 8 is provided at the end of the wooden beam 4 on the joint 3 side, and the perforated steel plate dowel 84 protruding from the joint metal 8 is embedded in the concrete of the joint 3. In addition, the horizontal reinforcing bars 10 protruding from the wooden beam 4 on both sides of the joint 3 are connected by the joint part 11 within the joint 3. By transmitting the shear force between the wooden beam 4 and the joint 3 using the above-mentioned joint metal 8, it is not necessary to place a large number of through bolts and horizontal reinforcing bars 10 within the joint 3, the configuration within the joint 3 can be simplified, and construction is easy. In this embodiment, the horizontal reinforcing bars 10 protruding from the wooden beam 4 are connected by the joint part 11, so there is no need to move one wooden beam 4 in the beam axial direction to insert the horizontal reinforcing bars 10 protruding from the wooden beam 4 into the holes of the other wooden beam 4, and the wooden beam 4 can be installed by simply dropping it from above, making construction easy.

[0039] In this embodiment, the shear force can be reliably transmitted by the shear resistance of the concrete of the joint 3 filled in the holes 841 of the perforated steel dowel 84, and the structure has high strength and rigidity. Furthermore, in this embodiment, the circular steel pipe 9 installed in the wooden column 2 below the joint 3 transmits the shear force between the wooden column 2 and the joint 3, eliminating the need to place many vertical reinforcing bars 6, etc., in the joint 3, simplifying the structure inside the joint 3 and facilitating construction.

[0040] Regarding the above-mentioned vertical reinforcing bars 6, in this embodiment, by arranging an integral vertical reinforcing bar 6 continuously between the upper and lower wooden columns 2, it is not necessary to connect the vertical reinforcing bars 6 with mechanical joints or the like within the joint 3, which makes construction easier. However, it is possible to connect the tips of the vertical reinforcing bars protruding from the upper and lower wooden columns 2 with joints such as mechanical joints within the joint 3.

[0041] A circular steel pipe 9 is also installed on the upper surface of the slab 5, and its upper part is buried in the wooden column 2 above the slab 5, thereby enabling shear force to be transmitted between the wooden column 2 and the slab 5 and reducing the number of vertical reinforcing bars 6, etc.

[0042] Furthermore, the metal joint 8 can be securely joined to the wooden beam 4 by the joint plate 82, and the upper and lower flanges 83 can support both the long-term load applied to the wooden beam 4 and the shear force during an earthquake.

[0043] However, the present invention is not limited to the above embodiment. For example, in this embodiment, the wooden column 2 and the wooden beam 4 are joined by the joint structure 1, but it is also possible to use a reinforced concrete column instead of the wooden column 2, or a composite structure column made of concrete and wooden materials may be used.

[0044] The joint structure 1 of this embodiment is applied to a single-panel rigid frame structure, but may also be applied to the joints of rigid frame structures in two directions, the plane shown in Fig. 1(a) and a plane perpendicular to the plane in plan. In this case, wooden beams 4 are provided not only on the left and right of the joint 3, but also in front and behind the joint 3 (corresponding to the top and bottom in Fig. 1(c)).

[0045] Furthermore, the configuration of the wooden pillars 2 and wooden beams 4 is not limited to the above, and for example, a decorative material may be provided on the outside of the flame-retardant layers 22, 42, or a flame-retardant material such as gypsum board may be used as the flame-retardant layers 22, 42. Furthermore, although the cross section of the wooden pillars 2 and wooden beams 4 is rectangular, the shape is not particularly limited.

[0046] In this embodiment, the perforated steel dowel 84 is used as the shear resistance member of the joint metal fitting 8, but it is also possible to use a rod-shaped protruding member such as a headed stud or reinforcing bar instead of the perforated steel dowel 84. Similarly, in this embodiment, the circular steel pipe 9 is used as the shear resistance member of the wooden column 2, but it is also possible to use a rod-shaped protruding member such as a headed stud or reinforcing bar instead of the circular steel pipe 9.

[0047] In addition, in this embodiment, the joint metal 8 is fixed to the load-bearing portion 41 of the wooden beam 4 using the drift pin 85, but this is not limited to this, and the structure will be valid even if the drift pin 85 is not used.

[0048] Other shapes, configurations, etc. of the metal joint 8 are not particularly limited. Below, examples using different metal joints will be described as the second to fourth embodiments. In these embodiments, configurations different from the previously described embodiments will be mainly described, and similar configurations will be given the same reference numerals in the drawings and the like and description thereof will be omitted. Furthermore, the configurations described in each embodiment, including the first embodiment, can be combined as necessary.

[0049] [Second embodiment] 4(a) to (c) show cross sections similar to those of Fig. 1(a) to (c) relating to a joint structure 1a according to a second embodiment of the present invention. The joint structure 1a differs from the joint structure 1 of the first embodiment mainly in the shape of the joint metal member 8a.

[0050] 5 is a diagram showing a joint metal 8a. The joint metal 8a has an end plate 81, a joint plate 82, a flange 83, and a perforated steel plate dowel 84 similar to the joint metal 8 described above, but the perforated steel plate dowel 84 is provided over the entire height of the end plate 81 on both sides in the width direction of the end plate 81.

[0051] When attaching the connecting metal fitting 8a to the wooden beam 4, the horizontal reinforcing bar 10 protruding from the load-bearing portion 41 of the wooden beam 4 is passed through the hole 811 in the end plate 81, but no hole as described above is provided in the end portion of the load-bearing portion 41 on the joint 3 side and in the joint plate 82, thereby avoiding cross-sectional loss in the wooden beam 4.

[0052] In this embodiment, as shown in Figures 4(a) and (c), a cross plate 9a made of steel plates combined in a flat cross shape is used instead of the circular steel pipe 9. The lower part of the cross plate 9a is embedded in the load-bearing part 21 of the lower wooden column 2 and the upper surface of the slab 5, and its upper part protrudes in a convex shape from the wooden column 2 and the slab 5, and this convex part (shear resistance member) is embedded in the concrete of the joint 3 and the load-bearing part 21 of the upper wooden column 2. Reference numeral 13 in Figure 4(c) denotes a decorative material provided on the outer surface of the joint 3.

[0053] [Third embodiment] 6(a)-(c) show cross sections similar to those of Fig. 1(a)-(c) for a joint structure 1b according to a third embodiment of the present invention. The joint structure 1b differs from the joint structure 1 according to the first embodiment mainly in that the protruding length of the perforated steel plate dowel 84 of the joint metal fitting 8b is increased, and the hoop reinforcement 7a is placed through the hole 841 to increase the shear resistance of the concrete in the hole 841, thereby improving the shear force transmission performance.

[0054] As shown in FIG. 6(c), the hoop bar 7a is formed by combining both ends of a pair of planar U-shaped reinforcing bars 71 together to form a ring. Both ends of each reinforcing bar 71 are passed through holes 841 in a perforated steel dowel 84 and the ends of both reinforcing bars 71 are fixed together by welding or the like, so that the hoop bar 7a can be easily positioned when constructing the joint structure 1b.

[0055] In addition, in this embodiment, the central cross-sectional portion of the load-bearing portion 21 of the wooden column 2 below the joint 3 is convex upward, and this convex portion 9b (shear resistance member) is embedded in the concrete of the joint 3, making it possible to transmit shear force between the wooden column 2 and the joint 3.

[0056] For the upper wooden column 2, the load-bearing part 21 abuts against the upper surface of the joint 3, and both sides of the load-bearing part 21 are sandwiched between the slab 5. This allows shear force to be transmitted between the upper wooden column 2 and the slab 5. The fire-retardant layer 22 of the wooden column 2 is placed on the slab 5.

[0057] To construct joint structure 1b, after constructing the lower wooden column 2, the left and right wooden beams 4, to which joint metal fittings 8b and horizontal reinforcing bars 10 have been attached in advance, are dropped from above as shown by the arrows in Fig. 7(a) and placed on the lower wooden column 2 as shown in Fig. 7(b). After this, the tips of the horizontal reinforcing bars 10 of the left and right wooden beams 4 are connected to each other with joints 11, the hoop bars 7a are placed, and concrete is poured into the joint 3 as shown in Fig. 7(c).

[0058] Next, as shown by the arrow in Fig. 7(c), the upper wooden column 2 is dropped from above the slab 5, and the upper ends of the horizontal reinforcing bars 10 protruding from the slab 5 are inserted into the holes 211 formed in the load-bearing parts 21 of the wooden column 2, and the holes are filled with adhesive. After erecting the wooden column 2 in this way as shown in Fig. 7(d), concrete is poured for the slab 5 to form the joint structure 1b shown in Fig. 6(a) etc.

[0059] [Fourth embodiment] 8(a) to 8(c) show cross sections similar to those of Figs. 1(a) to 1(c) relating to a joint structure 1c according to a fourth embodiment of the present invention. The joint structure 1c differs from the joint structure 1 of the first embodiment mainly in the shape of the joint metal member 8c.

[0060] 9 is a diagram showing the joint metal 8c. The joint metal 8c has an end plate 81, a joint plate 82, a flange 83, and a perforated steel plate dowel 84 similar to the joint metal 8 described above, but the flange 83 is provided only on the lower end of the end plate 81, and supports the long-term load of the wooden beam 4.

[0061] The joint plate 82 and the perforated steel dowel 84 are provided on both widthwise sides of the end plate 81 at positions that abut both widthwise ends of the load-bearing portion 41 of the wooden beam 4 (see also FIG. 8(c) and the like), and the joint plate 82 has a substantially right-angled triangular shape so as to connect the end plate 81 and the flange 83. As shown in FIG. 8(a), the perforated steel dowel 84 is provided slightly below the center in the height direction of the end plate 81, and the upper end of the perforated steel dowel 84 and the upper end of the joint plate 82 are located at approximately the same height. In this embodiment, the planar dimensions of the joint 3 correspond to the cross-sectional dimensions of the wooden column 2.

[0062] In this embodiment, as shown in Fig. 8(a), the load-bearing portion 21 of the wooden column 2 below the joint 3 protrudes above the flame-retardant layer 22, and this protrusion (shear-resistant member) is capable of transmitting shear force between the wooden column 2 and the joint 3. The lower portion of a reinforcing bar 9c is embedded in the upper end of the load-bearing portion 21, and the upper portion of the reinforcing bar 9c is embedded in the concrete of the joint 3. This reinforcing bar 9c functions as a fail-safe against the movement of the lower wooden column 2 attempting to shift horizontally during an earthquake. A total of four reinforcing bars 9c are provided at positions corresponding to the four corners of the rectangle.

[0063] Similarly to the above, the lower flame-retardant layer 42 of the wooden beam 4 is placed on the flame-retardant layer 22 of the lower wooden column 2. In this embodiment, the load-bearing part 21 of the upper wooden column 2 is sandwiched between the concrete of the slab 5 and abuts against the upper surface of the joint 3.

[0064] Although the preferred embodiment of the present invention has been described above with reference to the accompanying drawings, the present invention is not limited to such an example. It is clear that a person skilled in the art can come up with various modified or altered examples within the scope of the technical ideas disclosed in this application, and it is understood that such examples also naturally belong to the technical scope of the present invention. [Explanation of symbols]

[0065] 1, 1a, 1b, 1c: Joint structure 2: Wooden pillar 3: Joint 4: Wooden beam 5: Slab 6: Vertical rebar 7, 7a: Hoop muscle 8, 8a, 8b, 8c: Metal joints 9: Round steel pipe 9a: Cross plate 9b: Convex 9c: Reinforcement 10: Horizontal rebar 11: Joint part 81: End plate 82: Joint plate 83: Flange 84: Perforated steel plate dowel

Claims

1. A joint structure in which a pillar and a wooden beam are joined by a concrete joint, A joint metal is provided at the end of the wooden beam on the joint side, A shear resistance member protruding from the joint metal to a horizontal position of the joint is embedded in the joint, A joint structure characterized in that horizontal steel bars protruding from the wooden beams on both sides of the joint are connected by joint parts within the joint.

2. 2. The joint structure according to claim 1, wherein the shear resistance member is a perforated steel plate dowel provided along the vertical direction.

3. 2. The joint structure according to claim 1, wherein a shear resistance member is embedded in the joint and protrudes from a lower column of the joint to a position partway in the vertical direction of the joint.

4. 2. The joint structure according to claim 1, characterized in that a vertical reinforcing bar that is continuous between the upper and lower columns of the joint is arranged so as to penetrate the joint.

5. The joining metal fittings are An end plate provided on an end surface of the wooden beam; A joint plate embedded in the end of the wooden beam on the joint side; having The joint structure according to claim 1 , wherein the horizontal reinforcing bars penetrate the end plates.

6. The joint structure according to claim 5, characterized in that the joint metal further has flanges joined to the upper and lower ends of the end plate and positioned on the upper and lower surfaces of the end of the wooden beam on the joint side.

7. A slab is provided above the joint, 2. The joint structure according to claim 1, wherein a protrusion protruding from the slab is embedded in a column above the slab.

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