Wooden shaft materials and building structures

Abstract

To provide a woody shaft member having excellent strain energy absorption performance and capable of suppressing cracks that may occur when a building frame is deformed, and a building frame having excellent seismic performance.SOLUTION: A woody shaft member 80 has a woody body 10 with a housing hole 12 and a joint metal fitting 15 embedded in the housing hole 12. The joint metal fitting 15 has a steel first pipe 20 having a first hollow part 21 and a first screw groove 22, a steel shaft member 30 having a core material 31 and a first screw 32 larger in diameter than the core material 31 and a second screw 33, and a steel first cotter 40 having a second hollow part 41 and a second screw groove 42. A part of the first pipe 20 is housed in the second hollow part 41, and the shaft member 30 is housed in the second hollow part 41 and the first hollow part 21. The first screw groove 22 and the first screw 32, and the second screw groove 42 and the second screw 33 are screw-fixed. A steel second pipe 50 is provided on the periphery of the first pipe 20 and on the inner side in the axial direction of the wooden body 10 than the first cotter 40.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a wooden shaft member and a building frame. [Background technology]

[0002] In wooden buildings constructed using the wooden framework method, wooden axial members that form the columns, beams, foundations, etc. are joined together using fastening metal fittings such as drift pins and lag screw bolts, and by tightening the members together, the rigidity and strength of the joints are increased, thereby improving earthquake resistance. However, while the use of fastening metal fittings such as lag screw bolts increases the rigidity of the joints, the tradeoff is that the deformation performance of the joints decreases, raising concerns about brittle fracture at the joints.

[0003] Therefore, in order to impart deformation performance to the joints between components, measures have been proposed, such as creating a long hole extending axially inside a connecting metal fitting such as a screw or bolt, and joining the bolt to a thread groove at the end of the long hole, or crimping the bolt to a pipe with threads on its outer surface, thereby improving the deformation performance of the bolt when it is pulled.

[0004] For example, Patent Document 1 proposes a connecting fitting including a lag screw body and a connecting threaded shaft that is integral with the lag screw body and protrudes concentrically from one end of the lag screw body. This lag screw body is constructed from a pipe material with a rotational angular shank on one end and a bolt crimp-fixing region on the other end, with a helical ridge formed on the outer circumferential surface between the rotational angular shank and the bolt crimp-fixing region. The connecting threaded shaft is formed by the rear-end threaded shaft portion of a bolt inserted into the lag screw body, and the other end of the bolt is provided with a tip-end threaded shaft portion located inside the bolt crimp-fixing region of the lag screw body, with the inner circumferential surface of the bolt crimp-fixing region being crimped to the tip-end threaded shaft portion of the bolt, thereby integrating the two. This connecting fitting is said to enable easy and inexpensive manufacture of long lag screw-type connecting fittings and to provide a lag screw-type connecting fitting with high seismic isolation effect utilizing the elongation performance of the bolt.

[0005] Meanwhile, Patent Document 2 proposes a fastener having a cylindrical outer shape with a spiral ridge formed on the circumferential surface, an axially extending lead-in hole formed in the center of one end face, and a female screw at the back of the lead-in hole that extends axially and reaches the opposite face, the diameter of the lead-in hole being larger than the outer diameter of the female screw. By embedding this fastener in, for example, a beam and connecting a lag screw bolt embedded in a column to the fastener through the lead-in hole, when an external force during an earthquake acts and deforms the column and beam so that they separate, the lag screw bolt undergoes plastic deformation to absorb energy, preventing the fastener and lag screw bolt from falling out and avoiding damage to the fastening part. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2019-2200 A [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-7428 Summary of the Invention [Problem to be solved by the invention]

[0007] The connecting fittings and fastening hardware described in Patent Documents 1 and 2 are all expected to rely only on the deformation performance of the tensile side of the bolts being connected, and so although the deformation performance of the tensile side of the bolt is exerted against the tensile force acting on the joint of the members during an earthquake, sufficient performance cannot be expected against the compressive force acting on the joint during an earthquake, and as a result, it cannot be said that they have high strain energy absorption performance during an earthquake.

[0008] Furthermore, when a building frame is deformed during an earthquake, when the loads such as compressive forces acting on the connecting fittings and fastening hardware at the joints of the wooden shaft members reach a certain load, the wooden shaft members may crack due to the pressing force acting from the connecting fittings on the wooden shaft members, but Patent Documents 1 and 2 do not disclose any means to prevent this cracking.

[0009] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a wooden shaft member that has excellent strain energy absorption performance and can suppress cracking that may occur when the building frame is deformed by utilizing the deformation performance of both the tensile side and the compressive side of the metal shaft member provided at the end of the wooden shaft member, and a building frame that is equipped with this wooden shaft member and has excellent earthquake resistance performance. [Means for solving the problem]

[0010] In order to achieve the above object, one aspect of the wooden shaft member according to the present invention is: a wooden body having a receiving hole at an end; a metal fitting embedded in the receiving hole, The connecting fitting is a first pipe made of steel, the first pipe having a first hollow portion therein and a first thread groove at one end of the first hollow portion; a steel shaft member including a steel core material and a first screw and a second screw located at both ends of the core material and having a larger diameter than the core material; a first steel cotter having a second hollow portion therein and a second thread groove; a part of the first pipe is accommodated in the second hollow portion, the shaft member is accommodated in the second hollow portion and the first hollow portion, the first screw groove and the first screw are screw-fixed, and the second screw groove and the second screw are screw-fixed, A second pipe made of steel is provided around the first pipe and axially inside the first cotter of the wooden body.

[0011] According to this aspect, a core material and an axial member having a first screw and a second screw at both ends, which are larger in diameter than the core material, are arranged in the first hollow portion of the first pipe, which is housed and fixed in the housing hole at the end of the wooden body, and in the second hollow portion of the first cotter, in which a part of the first pipe is housed.By screwing the core material into the first screw groove of the first pipe and the second screw groove of the first cotter, when a tensile force is applied during an earthquake, the first pipe and the axial member undergo tensile deformation, and when a compressive force is applied, the core material that constitutes the axial member undergoes buckling deformation, thereby effectively absorbing strain energy during an earthquake.

[0012] Furthermore, according to this embodiment, a second steel pipe is provided around the first pipe, axially inward of the wooden body relative to the first cotter, and the second pipe presses down on the first pipe, thereby preventing cracks that may occur in the wooden body starting from the first cotter, similar to firewood splitting, and preventing the wooden body from opening due to such cracks.

[0013] In this aspect, the steel core material that actually deforms has a smaller diameter than the first screw and second screw that screw-fix to the first pipe and the first cotter, so gaps that allow buckling deformation are formed between the core material and the first hollow portion of the first pipe, and between the core material and the second hollow portion of the first cotter. In the shaft member, the first screw and second screw that are located at both ends and fixed to the first pipe and the first cotter have a relatively larger diameter than the central core material, so when a compressive force is applied to the shaft member, the core material buckles and deforms, and the first screw and second screw do not break first.

[0014] Furthermore, when the core material buckles, because the first pipe and first cotter are located around the core material and the wooden body is located around the first pipe and first cotter, the core material, which is allowed to deform, buckles inside the first pipe and first cotter, but is restrained by the first pipe, first cotter, and wooden body, preventing buckling failure of the core material. In other words, the first pipe and first cotter are embedded at the end of the wooden body, and both ends of the shaft member are fixed inside the first pipe and first cotter with a gap between the core material and the first pipe and first cotter, forming a so-called buckling-restrained brace at the end of the wooden shaft member.

[0015] The wooden body may be made of solid wood or laminated lumber consisting of multiple laminae. For example, even if a weak wood species such as cedar is used, the embedded structure of the first pipe, first cotter, and shaft member allows for stable deformation performance in both compression and tension.

[0016] In another aspect of the wooden shaft member according to the present invention, A second pipe is provided at the end of the first cotter, with a gap for allowing the wooden body to deform. The second hollow portion of the first cotter is characterized in that a gap for allowing deformation of the core material is provided.

[0017] According to this aspect, the second pipe is provided at the end of the first cotter via a gap for deformation of the wooden body, so that when a compressive force acts on the wooden body and the core material buckles, the gap for deformation of the wooden body prevents the first cotter and the second pipe from coming into contact and interfering with each other. Also, the gap for deformation of the core material is provided in the second hollow part of the first cotter, so that buckling deformation can occur in the core material when a compressive force acts on the wooden body.

[0018] In another aspect of the wooden shaft member according to the present invention, a second cotter having a third steel pipe, at least a portion of which is buried in the end of the wooden body, and the first pipe is disposed inside the third pipe; A gap is provided at the end of the third pipe to allow for deformation of the wooden body, The core material protrudes outward from the end of the wooden body and is further fixed to the second cotter with a screw.

[0019] According to this aspect, at least a portion of the third pipe provided in the second cotter is embedded in the end of the wooden body, and the core material extends outward from the end of the wooden body and is screwed to the second cotter. This allows the third pipe and the wooden body to exert buckling stiffening strength when the core material buckles. Furthermore, because the third pipe presses against the periphery of the first pipe, it is possible to prevent cracks that may occur in the wooden body starting from the second cotter. Furthermore, by providing both buckling stiffening strength and crack prevention capabilities for the wooden body, it is possible to reduce production costs.

[0020] In another aspect of the wooden shaft member according to the present invention, The receiving hole is a threaded hole, and the first pipe has a threaded circumferential surface. The first pipe is threadedly engaged with the receiving hole.

[0021] According to this aspect, by screwing the first pipe, which has a threaded circumferential surface, into the receiving hole, which is a screw hole, it is possible to manufacture a wooden shaft member with a high joining strength between the receiving hole of the wooden body and the first pipe. Here, an example of the first pipe, which has a threaded circumferential surface, is a pipe plug screw bolt (pipe LSB).

[0022] In another aspect of the wooden shaft member according to the present invention, The housing hole and the first pipe are fixed together via an adhesive.

[0023] According to this aspect, for example, by drilling a cylindrical accommodating hole at the end of the wooden main body and inserting a cylindrical first pipe while filling the accommodating hole with adhesive, a wooden shaft member with high joint strength between the accommodating hole in the wooden main body and the first pipe can be produced with high production efficiency.

[0024] Another aspect of the wooden shaft member according to the present invention is: A rotating piece that is rotatably attached to a connecting jig connected to the building frame is directly or indirectly attached to the outer end of the first cotter or the second cotter.

[0025] According to this aspect, a rotating piece that can be freely rotated to a connecting jig connected to the building frame is attached to the outer end of the first cotter or the second cotter, so that the wooden shaft member can be attached to a pillar or beam efficiently and with high strength at an attachment angle with a high degree of freedom.

[0026] Furthermore, one aspect of the building frame according to the present invention is The structure includes a wooden brace made of the wooden shaft member, a beam, and a column, The wooden braces are connected to the beams and the columns.

[0027] According to this aspect, by using the wooden shaft member of the present invention as a wooden brace, a building frame is formed that has excellent deformation performance on both the compression side and the tension side at the joints between the columns or beams and the wooden brace, and has excellent strain energy absorption performance during an earthquake. In addition, the deformation performance of the wooden brace suppresses a sudden increase in load at the joints between the columns or beams and the wooden brace when external forces are applied during an earthquake. Furthermore, because the metal fittings such as the first pipe, first cotter, second cotter, and shaft member are embedded inside the wooden body, the metal fittings cannot be seen in their entirety from the outside, resulting in a building frame with wooden braces that has excellent exterior design.

[0028] Here, the building frame of this embodiment may be a building frame that constitutes a wooden building in which both the columns and beams are made of wood, or a building frame that constitutes a steel-framed building in which the columns and beams are made of steel, or a building frame that constitutes an RC (Reinforced Concrete) building in which the columns and beams are made of reinforced concrete. [Effects of the Invention]

[0029] As can be understood from the above explanation, the wooden shaft member and building frame of the present invention can provide a wooden shaft member with excellent strain energy absorption performance and capable of suppressing cracking that may occur when the building frame is deformed, by utilizing the deformation performance of both the tensile and compressive sides of the metal shaft member provided at the end of the wooden shaft member, and a building frame equipped with this wooden shaft member and having excellent earthquake resistance performance. [Brief explanation of the drawings]

[0030] [Figure 1] 1 is a longitudinal cross-sectional view of an example of a wooden shaft member according to a first embodiment. [Figure 2] FIG. 2 is a diagram showing a state in which a compressive force is applied to the wooden shaft member according to the first embodiment. [Figure 3]FIG. 2 is a diagram showing a state in which a tensile force is applied to the wooden shaft member according to the first embodiment. [Figure 4] FIG. 10 is a longitudinal cross-sectional view of an example of a wooden shaft member according to a second embodiment. [Figure 5] 1(a) to 1(e) are schematic diagrams showing an example of a building frame according to an embodiment. [Figure 6] FIG. 6 is a front view specifically showing the building frame shown in FIG. 5(d). DETAILED DESCRIPTION OF THE INVENTION

[0031] Below, examples of wooden shaft members and building frames according to each embodiment will be described with reference to the accompanying drawings. Note that in this specification and drawings, substantially identical components will be designated by the same reference numerals, and redundant explanations may be omitted.

[0032] [Wood shaft member according to the first embodiment] First, an example of a wooden shaft member according to the first embodiment will be described with reference to Figures 1 to 3. Here, Figure 1 is a longitudinal cross-sectional view of an example of a wooden shaft member according to the first embodiment. Also, Figures 2 and 3 are diagrams showing states in which a compressive force and a tensile force are applied to the wooden shaft member according to the first embodiment, respectively. Here, Figures 1 to 3 show a wooden shaft member 80 cut in half.

[0033] The wooden shaft member 80 has a long wooden body 10 with a receiving hole 12 at each of two ends 11, and metal joints 15 embedded in the receiving holes 12.

[0034] The wooden body 10 is made of solid wood or laminated wood with laminated lamina. The receiving hole 12 provided at the end 11 of the wooden body 10 is, for example, a multi-stage cylindrical receiving hole (the illustrated example is a two-stage cylindrical hole) with different cross-sectional dimensions.

[0035] The metal connector 15 has a first pipe 20 made of steel, a first cotter 40 made of steel, and a shaft member 30 made of steel.

[0036] The first pipe 20 has a first hollow portion 21 inside, a first screw groove 22 at one end of the first hollow portion 21, and a threaded circumferential surface 23. This first pipe 20 is a pipe plug screw bolt (pipe LSB) with threads on the circumferential surface.

[0037] The receiving hole 12 of the wooden body 10 is, for example, a screw hole, and the first pipe 20 is screwed into the receiving hole 12 of the wooden body 10 by screwing the first pipe 20 into the receiving hole 12. Here, the receiving hole may not be a screw hole, and the circumferential surface of the first pipe may not be threaded, and the first pipe may be inserted into the receiving hole and fixed to both sides with an adhesive.

[0038] The shaft member 30 has a core material 31, and a first screw 32 and a second screw 33 located at both ends of the core material 31 and having a larger diameter than the core material 31. In this way, the shaft member 30 having the first screw 32 and the second screw 33 at both ends and the core material 31 with a relatively small diameter located in the center is formed by, for example, rolling processing.

[0039] The first cotter 40 has a second hollow portion 41 inside and a second screw groove 42 at its end.

[0040] A portion of the first pipe 20 is accommodated in the second hollow portion 41 of the first cotter 40, the shaft member 30 is accommodated in the second hollow portion 41 and the first hollow portion 21, the first screw groove 22 of the first pipe 20 is screwed into the first screw 32 of the shaft member 30, and the second screw groove 42 of the first cotter 40 is screwed into the second screw 33 of the shaft member 30.

[0041] A portion of the first cotter 40 protrudes outside the wooden body 10, and a rotating piece 60 is attached to a fixing jig 45 at the end of the first cotter 40. This rotating piece 60 is a member that is rotatably attached to a connecting jig that is connected to the building frame, which will be described below.

[0042] In the shaft member 30, since the core material 31 has a smaller diameter than the first screw 32 and the second screw 33, a gap G1 is formed between the core material 31 and the wall surface of the first hollow portion 21 of the first pipe 20, which allows buckling of the core material 31.

[0043] A hexagonal nut 35 is fixed to the core 31 in the entrance region of the second hollow portion 41 , and the hexagonal nut 35 is in sliding contact with the wall surface of the second hollow portion 41 .

[0044] In the second hollow portion 41, a gap G3 (width t1) for a deformation allowance for buckling deformation of the core material 31 is provided between the hexagonal nut 35 and the bottom of the counterbore of the second hollow portion 41.

[0045] A second steel pipe 50 is provided around the first pipe 20, axially inward of the first cotter 40, with a gap G2 (width t1) for allowing the wooden body 10 to deform. The inner diameter of the second pipe 50 is larger than the outer diameter of the first pipe 20.

[0046] As shown in Fig. 2, when a compressive force N1 acts on the wooden shaft member 80, the wooden body 10 is pushed axially inward, eliminating the deformation-substituting gaps G2 and G3 shown in Fig. 1. If the compressive force N1 acting is greater than the buckling strength of the core material 31, the core material 31 buckles and deforms in the gap G1 of the first hollow portion 21, abutting against the wall surface of the first hollow portion 21 and restricting further deformation. Depending on the amount of compressive deformation of the wooden body 10, the deformation-substituting gaps G2 and G3 may not completely disappear as in the illustrated example, but may remain slightly.

[0047] In this way, when a compressive force N1 acts on the wooden body 10 and the metal connector 15 during an earthquake, the core material 31 of the shaft member 30 that constitutes the metal connector 15 buckles and deforms, thereby effectively absorbing the strain energy during the earthquake. In this case, the first screw 32 and second screw 33 of the shaft member 30, which have a larger diameter than the central core material 31, are fixed to the first pipe 20 and the first cotter 40 at both ends of the core material 31, respectively. As a result, the first screw 32 and second screw 33 do not break first in response to the compressive force N1, and the core material 31 buckles and deforms.

[0048] Furthermore, when the core material 31 buckles and deforms, the first pipe 20 and the first cotter 40 are located on the outer periphery of the core material 31, and the wooden body 10 is located on the outer periphery of the first pipe 20 and the first cotter 40. Therefore, even though the core material 31 buckles and deforms in the first hollow portion 21 of the first pipe 20 and the second hollow portion 41 of the first cotter 40, it is restrained by the first pipe 20, the first cotter 40, and the wooden body 10, and buckling failure of the core material 31 is prevented.

[0049] Furthermore, since a second steel pipe 50 is provided around the first pipe 20 and axially inward of the wooden body 10 relative to the first cotter 40, the second pipe 50 presses down on the periphery of the first pipe 20, preventing cracks that may occur in the wooden body 10 starting from the first cotter 40, for example, like firewood splitting, and preventing the wooden body 10 from opening due to such cracks.

[0050] On the other hand, as shown in Figure 3, when a tensile force N2 acts on the wooden body 10 and the connecting fitting 15, the wooden body 10 is pulled axially outward, the width dimension of the deformation substitute gap G2 increases to t2 (>t1), and the first cotter 40 protrudes further outward from the end 11 of the wooden body 10.

[0051] Furthermore, when the applied tensile force N2 is greater than the tensile strength of the core material 31, the core material 31 deforms in the tensile direction, thereby absorbing strain energy during an earthquake.

[0052] In this way, the wooden main body 10 and the building frame are connected via a joint fitting 15 that exhibits deformation performance on both the tensile and compressive sides, making it possible to incorporate a wooden shaft member 80 with spindle-shaped hysteretic characteristics as a wooden brace.

[0053] [Wood shaft member according to the second embodiment] Next, an example of a wooden shaft member according to a second embodiment will be described with reference to Fig. 4. Here, Fig. 4 is a vertical cross-sectional view of an example of a wooden shaft member according to the second embodiment.

[0054] The wooden shaft member 80A differs from the wooden shaft member 80 in that it has a connector 15A equipped with a second cotter 70 instead of the connector 15 equipped with a first cotter 40 and a second pipe 50.

[0055] The joint fitting 15A has a first pipe 20 made of steel, a second cotter 70 made of steel, and a shaft member 30 made of steel.

[0056] The second cotter 70 made of steel has a third pipe 71 with a third hollow portion 73 and a disk 72, and one end of the third pipe 71 is welded to one surface of the disk 72.

[0057] A third screw groove 74 is formed in the disk 72, and one end of the shaft member 30 inserted into the first hollow portion 21 of the first pipe 20 is inserted into the third hollow portion 73, and the second screw 33 is screwed into the third screw groove 74 while protruding outward from the end portion 11 of the wooden body 10.

[0058] A gap G4 is provided at the end of the third pipe 71 in the wooden body 10 to allow for deformation of the wooden body 10 when the wooden body 10 is compressed and deformed. In addition, a gap G5 is provided between the end 11 of the wooden body 10 in the third pipe and the disk 72 to allow for deformation of the wooden body 10.

[0059] According to the wooden shaft member 80A equipped with the connecting fitting 15A, at least a portion of the third pipe 71 provided on the second cotter 70 is embedded in the end of the wooden main body 10, and the core material 31 extends outward from the end 11 of the wooden main body 10 and is screwed to the second cotter 70, so that the third pipe 71 can exert buckling stiffness together with the wooden main body 10 when the core material 31 buckles.

[0060] Furthermore, because the third pipe 71 presses against the periphery of the first pipe 20, it is possible to prevent cracks that may occur in the wooden body 10 starting from the second cotter 70. Furthermore, because the connecting fitting 15A has both the ability to stiffen the wooden body 10 against buckling and the ability to prevent cracks in the wooden body 10, there is no need to use separate members that have both functions, which makes it possible to reduce manufacturing costs.

[0061] [Building frame according to the embodiment] Next, several examples of building frames according to the embodiment will be described with reference to Fig. 5 and Fig. 6. Here, Fig. 5(a) to Fig. 5(e) are schematic diagrams showing examples of building frames according to the embodiment, and Fig. 6 is a front view specifically showing the building frame shown in Fig. 5(d).

[0062] In each building frame shown in Figure 5, the wooden shaft member 80 (80A) is incorporated into the frame as a wooden brace. The beams 91 and columns 93 that make up each building frame may be wooden members, steel members, or reinforced concrete members. Furthermore, the building frame may have a form other than the illustrated example as long as it is equipped with at least the wooden brace 80 (80A).

[0063] The K-shaped building frame 100A shown in Figure 5(a) has a beam 91 and two columns 93 that support the beam 91, and two wooden braces 80 (80A) are attached so as to connect the lower ends of each column 93 to the center of the beam 91.

[0064] The building frame 100B shown in Figure 5(b) is an irregular K-shaped structure, and has a beam 91 and two pillars 93 that support the beam 91, and two wooden braces 80 (80A) are attached so as to connect the bottom ends of each pillar 93 to the left and right sides of the beam 91.

[0065] The knee-braced building frame 100C shown in Figure 5(c) has a beam 91 and two columns 93 that support the beam 91, and two wooden braces 80 (80A) are attached so as to connect the vicinity of the upper end of each column 93 to the vicinity of the left and right ends of the beam 91.

[0066] The single-braced building frame 100D shown in Figure 5(d) has a beam 91 and two columns 93 that support the beam 91, and one wooden brace 80 (80A) is attached so as to connect the upper end of one column 93 to the lower end of the other column 93.

[0067] The building frame 100E shown in Figure 5(e) is a K-type structure inverted by 90 degrees, and has a beam 91 and two columns 93 that support the beam 91, with two wooden braces 80 (80A) attached to connect the upper and lower ends of one column to the center of the other column.

[0068] FIG. 6 specifically shows the building frame 10D shown in FIG. 5(d), and also shows the base 92 as a component of the building frame.

[0069] At the upper right and lower left joints of the beam 91 and column 93, which form a rectangular frame when viewed from the front, connecting jigs 95 such as brackets are attached via bolts or the like, and the pivot pieces 60 at both ends of the wooden brace 80 (80A) are attached to each connecting jigs 95 with bolts and nuts 96.

[0070] The illustrated building frames 100A to 100E, which include wooden shaft members 80 (80A) as wooden braces, have excellent deformation performance in both compression and tension at the joints between the columns 93 or beams 91 and the wooden braces 80 (80A), resulting in a building frame with excellent strain energy absorption performance during an earthquake. Furthermore, the deformation performance of the wooden braces 80 (80A) prevents a sudden increase in load at the joints between the columns 93 or beams 91 and the wooden braces 80 (80A) when external forces are applied during an earthquake.

[0071] Furthermore, since most of the metal fittings 15, 15A are embedded inside the wooden body 10, the entire metal fittings cannot be seen from the outside, resulting in a building frame with wooden braces that has excellent external design.

[0072] It should be noted that the present invention is not limited to the configurations shown here, and other embodiments may be possible in which other components are combined with the configurations described in the above embodiments. In this regard, the present invention can be modified within the scope of the present invention, and can be appropriately determined depending on the application form. [Explanation of symbols]

[0073] 10: Wooden body 11: Edge 12: Storage hole 15, 15A: Joint fittings 20: First Pipe 21: 1st hollow part 22: First screw groove 23: Threaded surface (surface) 30: Shaft member 31: Core material 32: First screw 33: Second screw 35: Hexagon nut 40: First Cotter 41:Second hollow part 42: Second screw groove 45: Fixture 50: Second pipe 60: Rotating piece 70: Second Cotter 71: Third Pipe 72: Disk 73: Third hollow part 74: 3rd screw groove 80, 80A: Wooden shaft member (wooden brace) 91: Beam 92: Foundation 93: Pillar 95: Connection jig 96: Bolts and nuts 100A, 100B, 100C, 100D, 100E: Building frame G1: Gap G2, G3, G4, G5: Deformation substitute gap N1: Compression force N2: Tensile force

Claims

1. a wooden body having a receiving hole at an end; a metal fitting embedded in the receiving hole, The connecting fitting is a first pipe made of steel, the first pipe having a first hollow portion therein and a first thread groove at one end of the first hollow portion; a steel shaft member including a steel core material and a first screw and a second screw located at both ends of the core material and having a diameter larger than that of the core material; a first steel cotter having a second hollow portion therein and a second thread groove; a part of the first pipe is accommodated in the second hollow portion, the shaft member is accommodated in the second hollow portion and the first hollow portion, the first screw groove and the first screw are screw-fixed, and the second screw groove and the second screw are screw-fixed, A wooden shaft member characterized in that a second steel pipe is provided around the first pipe and axially inside the wooden body relative to the first cotter.

2. A second pipe is provided at the end of the first cotter via a gap for allowing deformation of the wooden body.

2. The wooden shaft member according to claim 1, wherein the second hollow portion of the first cotter is provided with a gap for allowing deformation of the core material.

3. A wooden body having a receiving hole at an end thereof; a metal fitting embedded in the receiving hole, The connecting fitting is a first pipe made of steel, the first pipe having a first hollow portion therein and a first thread groove at one end of the first hollow portion; a steel shaft member including a steel core material and a first screw and a second screw located at both ends of the core material and having a diameter larger than that of the core material; a second steel cotter having a third steel pipe and a third thread groove; At least a part of the third pipe is buried in an end of the wood body, the first pipe is disposed inside the third pipe, and the first screw is screw-fixed to the first screw groove. A gap is provided at the end of the third pipe to allow for deformation of the wooden body, A wooden shaft member characterized in that the core material extends outward from the end of the wooden body, and the second screw of the core material is screwed into the third screw groove of the second cotter.

4. The receiving hole is a threaded hole, and the first pipe has a threaded circumferential surface.

4. The wooden shaft member according to claim 1, wherein the first pipe is threadedly engaged with the receiving hole.

5. 4. The wooden shaft member according to claim 1, wherein the receiving hole and the first pipe are fixed to each other with an adhesive.

6. A wooden shaft member as described in claim 1 or 2, characterized in that a rotating piece that is freely rotatably attached to a connecting jig connected to a building frame is directly or indirectly attached to the outer end of the first cotter.

7. A wooden shaft member as described in Claim 3, characterized in that a rotating piece that can be freely rotated relative to a connecting jig connected to the building frame is directly or indirectly attached to the outer end of the second cotter.

8. A wooden brace comprising the wooden shaft member according to claim 6 or 7, a beam, and a column, A building frame, characterized in that the wooden braces are connected to the beams and the columns.

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