Joining structure of wooden frame members

Abstract

To provide a joint structure for wooden shaft members that allows the head of a headed mounting bolt, which joins one wooden shaft member to another, to be smoothly accommodated in a counterbore groove provided on the end grain surface of one wooden shaft member, while preventing both the headed mounting bolt and nut from rotating together when tightening a loosened bolt. [Solution] The joining structure 100 comprises a first wooden shaft member 10 through which a headed mounting bolt 70 with a head 75 passes, and a second wooden shaft member 20 having a receiving groove 26 into which a part of the first connecting fitting 40 fits. The planar dimension of the end opening 29 of the counterbore groove 28 provided on the end grain surface 22 of the second wooden shaft member 20 is set to be larger than the planar dimension of the head 75. An interference member 80 is attached to the end grain surface 22 so as to interfere with a part of the end opening 29, and the interference member 80 is in contact with the head 75.

Description

Technical Field

[0001] The present invention relates to a joining structure of a wooden shaft member.

Background Art

[0002] In wooden building structures using the wooden frame construction method, wooden shaft members such as columns, beams, and foundations are joined to each other via connecting fittings, and by tightening the members together, improvements in seismic resistance and the like are achieved.

[0003] For example, Patent Document 1 proposes a structure for joining columns and beams of a wooden building using the above-mentioned connecting fittings and an example of the connecting fittings applied to this joining structure. Specifically, a column joining plate to be inserted into a vertical hole of a column is provided on one side of a side plate that overlaps the side surface of the column, a beam joining plate to be inserted into a vertical groove formed in the end face of the beam is provided on the other side of the side plate, and a beam receiving plate is provided at a position below this beam joining plate, thereby forming a connecting fitting. A plurality of coupling holes for fastening the column with a fastener are provided in the column joining plate of the connecting fitting, a plurality of coupling holes for fastening the beam with a fastener are provided in the beam joining plate, and the arrangement and number of each coupling hole are set according to the sagging condition of the steel plate used for each joining plate. A drift pin is applied as the fastener, and a wooden ramen structure is configured by joining wooden columns and beams forming a portal frame.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in wooden frame construction, there are several forms of joint structures between wooden beams and wooden columns (joint structures between wooden structural members). One such form is a so-called beam-dominant joint structure in which a column is attached to the upper or lower surface of a wooden beam. In this structure, a metal pipe called a tenon pipe is embedded in both the wooden column and the wooden beam, spanning across them. A connecting hole is formed by aligning a pin hole in the tenon pipe with a pin hole in the wooden beam or wooden column, and a drift pin is inserted into the connecting hole to form the joint.

[0006] Another configuration involves arranging a pair of metal connecting pieces on the upper and lower surfaces of a wooden beam and joining these metal connecting pieces with bolts (headed mounting bolts) that penetrate the wooden beam. The wooden column has a receiving groove extending inward from the end face where it connects to the wooden beam. The metal connecting piece has a fitting member (such as a metal plate or mortise pipe) attached to it that fits into this receiving groove. The fitting member fits into the receiving groove, and the joint structure is formed by inserting a drift pin into a communication hole formed by pin holes at corresponding positions on both sides.

[0007] The latter joint structure makes it possible to form a joint structure for wooden stile members with even higher joint strength.

[0008] Regarding connecting fittings that join wooden columns and wooden beams, which are wooden structural members, the performance of the connecting fittings deteriorates drastically when the end of the wooden column splits at the end of the structural limit. Therefore, the influence of variations in the strength of the wood forming the wooden column becomes significant in the performance evaluation of the connecting fittings. To mitigate the influence of variations in wood strength, reinforcing the split end of the wooden column stabilizes the joint structure and the performance of the connecting fittings until the end of the structural limit is reached, leading to an improvement in the performance evaluation of the connecting fittings.

[0009] For example, one way to reinforce against this splitting is to drive screws into the wood. However, since the screws are driven near the ends of the wooden column, there is a concern that cracks may occur during screw driving, and these cracks can lead to a decrease in the performance and aesthetic appeal of the wooden column. This problem can become even more pronounced when the wooden column is made of laminated timber with multiple laminas stacked on top of each other, and screws are driven into the adhesive surface of the laminas.

[0010] Furthermore, as described above, in a configuration where a pair of metal connecting pieces are arranged on the upper and lower surfaces of the beam and these metal connecting pieces are joined with bolts (headed mounting bolts) that penetrate the wooden beam, the heads of the bolts protrude from the upper and lower sides of the wooden beam. Therefore, counterbore grooves are provided on the end grain of the wooden column joined to these sides to accommodate the heads of the bolts.

[0011] Generally, in the factory, a pair of metal connecting pieces are attached to the wooden beam by tightening a headed mounting bolt and nut, and the beam is transported to the site in this attached state. However, there is a good chance that the headed mounting bolt may loosen during this transport to the site. If, after the wooden beam has been erected at the site with the head of the headed mounting bolt fitted into the counterbore groove on the end face of the wooden column, loosening of the headed mounting bolt is noticed, it will be necessary to tighten it further. In this tightening process, if either the head of the headed mounting bolt or the nut is not fixed in place, both will rotate together, making it impossible to tighten further.

[0012] Therefore, a counterbore groove is machined on the end grain of the wooden column so that the planar dimensions of the counterbore groove and the head of the headed mounting bolt are approximately the same. This allows friction and engagement between the inner wall surface of the counterbore groove and the side surface of the head of the headed mounting bolt to fix the head in place and prevent it from rotating.

[0013] However, since the planar dimensions of both the counterbore groove and the head of the headed mounting bolt are approximately the same, a problem arises where the head of the headed mounting bolt cannot be accommodated in the counterbore groove due to processing errors in the counterbore groove relative to the end grain of the wooden column, or construction errors during the assembly of wooden beams and columns on site. If it cannot be accommodated, the planar dimensions of the counterbore groove will have to be hastily enlarged on site to accommodate the head, but if the planar dimensions of the counterbore groove are enlarged, a problem will arise where the head and nut will rotate together, making it impossible to further tighten the headed mounting bolt.

[0014] Based on the above, the objective is to provide a joint structure for joining multiple wooden shaft members via headed mounting bolts, which allows the head of the headed mounting bolt that joins the other wooden shaft member to be smoothly accommodated in a counterbore groove provided on the end grain surface of one wooden shaft member, while preventing both the loosened headed mounting bolt and nut from rotating together when tightening them. [Means for solving the problem]

[0015] To achieve the above objective, one aspect of the joint structure for wooden axial members according to the present invention is: It comprises a first wooden shaft member having a first bolt hole through which a headed mounting bolt has a head, and a second wooden shaft member having a receiving groove into which a part of the first connecting fitting fits, The first connecting fitting comprises a first connecting piece connected to the first wooden shaft member, and a first fitting piece that extends from the first connecting piece and fits into the housing groove. A second bolt hole is provided in the first connecting piece at a position corresponding to the first bolt hole. The aforementioned fitting piece is provided with a first pin hole through which a drift pin is inserted. The second connecting fitting further comprises at least a second connecting piece connected to the first wooden shaft member, and a third bolt hole is provided in the second connecting piece at a position corresponding to the first bolt hole. The first connecting fitting and the second connecting fitting are arranged on opposing sides of the first wooden shaft member, and the mounting bolts are inserted through the first bolt hole, the second bolt hole, and the third bolt hole to form a bolted joint. The second wooden shaft member is further provided with a second pin hole at a position corresponding to the first pin hole when the fitting member is fitted into the housing groove. In a joint structure for wooden shaft members, the first wooden shaft member and the second wooden shaft member are joined by inserting the drift pin through the second pin hole corresponding to the first pin hole, Of the second wooden shaft member, the end face that abuts the first connecting piece faces the end of the housing groove and is provided with a counterbore groove into which the head of the headed mounting bolt is housed. The planar dimension of the end opening facing the end grain surface in the aforementioned counterbore groove is set to be larger than the planar dimension of the head. The interfering member is attached to the end surface of the wood so as to interfere with a part of the end opening of the counterbore groove, and the interfering member is in contact with the head.

[0016] According to this embodiment, the planar dimension of the counterbore groove provided on the end grain surface of the second wooden shaft member, into which the head of the headed mounting bolt is accommodated, is set to be larger than the planar dimension of the head. Furthermore, an interfering member is attached to the end grain surface so as to interfere with a part of the end opening of the counterbore groove, and the interfering member is in contact with the head of the headed mounting bolt. This allows the head of the headed mounting bolt that joins the first wooden shaft member to the counterbore groove provided on the end grain surface of the second wooden shaft member to be smoothly accommodated, while preventing both the loosened headed mounting bolt and the nut from rotating together when tightening them.

[0017] Here, the first wooden shaft member and the second wooden shaft member are, for example, one is a wooden column and the other is a wooden beam (including a base). Also, "the second connecting fitting includes at least a second connecting piece" means a form in which the second connecting fitting includes only the second connecting piece and a form in which, in addition to the second connecting piece, a second fitting piece standing upright from the second connecting piece is provided. When the first wooden shaft member is a base or a wooden beam on the top floor, etc., the second connecting fitting of the former form is applied. When the first wooden shaft member is a wooden beam on an intermediate floor and the second connecting fitting joins the wooden beam to a second wooden shaft member (for example, a wooden column on the upper floor) separately, the second connecting fitting of the latter form is applied.

[0018] Also, in another aspect of the joining structure of the wooden shaft member according to the present invention, The interference member includes an interference piece disposed on the end face and a pair of engaging pieces bent at both ends of the interference piece by bending two portions of a steel plate. The interference piece is stretched so as to interfere with a part of the end opening with respect to the end face of the second wooden shaft member, and the pair of engaging pieces are engaged with a pair of opposing side faces of the second wooden shaft member.

[0019] According to this aspect, the interference member is formed by bending two portions of a steel plate, and includes an interference piece disposed on the end face and a pair of engaging pieces bent at both ends of the interference piece. The interference piece is stretched so as to interfere with a part of the end opening with respect to the end face of the second wooden shaft member, and the pair of engaging pieces are engaged with a pair of opposing side faces of the second wooden shaft member. Thus, the interference member having a simple structure can be fixed to the second wooden shaft member while interfering with the head of the headed attachment bolt accommodated in the mortise groove.

[0020] Also, in another aspect of the joining structure of the wooden shaft member according to the present invention, The interference member is composed of an interference piece having a plurality of protrusions on one wide surface. The interference piece is disposed at a position where it interferes with a part of the end opening with respect to the end face of the second wooden shaft member, and the protrusions are inserted into the end face.

[0021] According to this aspect, the interference member is composed of an interference piece having a plurality of protrusions on one wide surface, and the interference piece is disposed at a position where it interferes with a part of the end opening with respect to the end face of the second wood shaft member, and the protrusions are inserted into the end face, so that the interference member having a simple structure interferes with the head of the headed attachment bolt housed in the mortise groove. While doing so, the interference member can be fixed to the second wood shaft member.

[0022] Also, in another aspect of the joining structure of the wood shaft members according to the present invention, Groove stripes are provided linearly so as to interfere with a part of the mortise groove on the end face, It is characterized in that the interference piece is housed in the groove stripe.

[0023] Groove stripes are provided linearly so as to interfere with a part of the mortise groove on the end face, and the interference piece is housed in the groove stripe, so that the interference piece can be prevented from protruding from the end face. In addition, even when the interference piece is not housed in the groove stripe, since it is a joining structure between wood shaft members, when one is built into the other, the thin interference piece will be embedded in the joining part of both. However, in the form in which the interference piece is housed in the groove stripe, the generation of a slight gap at the joining interface between the wood shaft members can also be surely prevented.

[0024] Also, in another aspect of the joining structure of the wood shaft members according to the present invention, The second connecting fitting further has a second fitting piece standing upright from the second connecting piece, The second fitting piece is fitted into a housing groove of a separate second wood shaft member, and the first wood shaft member and the separate second wood shaft member are joined.

[0025] According to this aspect, the second connecting fitting further has a second fitting piece standing upright from the second connecting piece, and the second fitting piece is fitted into the housing groove of a separate second wood shaft member, and the first wood shaft member and the separate second wood shaft member are joined. Thus, a joining structure in which three wood shaft members are joined via the first connecting fitting and the second connecting fitting can be formed.

[0026] Furthermore, in another embodiment of the joint structure for wooden axial members according to the present invention, The first timber axial member is a timber beam, and the second timber axial member is a timber column.

[0027] According to this embodiment, since the first timber axial member is a timber beam and the second timber axial member is a timber column, it is possible to form a joint structure between the timber beam (first timber axial member) that forms the foundation and the timber column (second timber axial member) on the first floor, as well as a joint structure between the timber beam (first timber axial member) located at the highest point of the building, such as the attic or rooftop, and the timber column (second timber axial member) on the floor below it.

[0028] Furthermore, in another embodiment of the joint structure for wooden axial members according to the present invention, The first timber axial member is a timber beam, and the second timber axial member and the separate second timber axial member are timber columns.

[0029] According to this embodiment, a joint structure can be formed between the wooden beam (first wooden axial member) of the upper floor, the wooden column (second wooden axial member) of the lower floor, and the wooden column (a separate second wooden axial member) of the upper floor. [Effects of the Invention]

[0030] As can be understood from the above explanation, the wood shaft member joining structure of the present invention relates to a joining structure in which multiple wood shaft members are joined via a headed mounting bolt, and allows the head of the headed mounting bolt that joins the other wood shaft member to be smoothly accommodated in a counterbore groove provided on the end grain surface of one wood shaft member, while preventing both the loosened headed mounting bolt and nut from rotating together when tightening them. [Brief explanation of the drawing]

[0031] [Figure 1] This is a perspective view of an example of a joint structure for wooden slat members according to an embodiment. [Figure 2] This is an exploded perspective view of an example of a joint structure for a wooden slat member according to an embodiment. [Figure 3A]This is a perspective view of an example of an interference member. [Figure 3B] This is a magnified perspective view showing an example of an interference member attached to the end grain surface of the second wooden shaft member. [Figure 4A] This is a top-down plan view of the IV direction arrow in Figure 3B, showing an example of an interference member attached to the end grain surface of the second wooden axial member. [Figure 4B] Figure 4A is a plan view showing the state in which the head of a headed mounting bolt is housed in a counterbore groove. [Figure 5A] This is a perspective view of another example of an interfering member. [Figure 5B] This is a magnified perspective view showing another example of an interference member attached to the end grain surface of the second wooden shaft member. [Modes for carrying out the invention]

[0032] The joint structure of the wooden stile member according to the embodiment will be described below with reference to the attached drawings. In this specification and drawings, substantially identical components may be denoted by the same reference numerals to avoid redundant explanations.

[0033] [Joining structure of wooden frame member according to the embodiment] The joint structure of the wooden slat member according to the embodiment will be described with reference to Figures 1 to 5. Here, Figure 1 is a perspective view of an example of the joint structure of the wooden slat member according to the embodiment, and Figure 2 is an exploded perspective view of an example of the joint structure of the wooden slat member according to the embodiment. Furthermore, Figure 3A is a perspective view of an example of an interference member, and Figure 3B is an enlarged perspective view showing the state in which the example of the interference member is attached to the end grain surface of the second wooden slat member. Furthermore, Figure 4A is a view in the direction of arrow IV in Figure 3B, and is a plan view from above showing the state in which the example of the interference member is attached to the end grain surface of the second wooden slat member, and Figure 4B is a diagram showing the state in which the head of the headed mounting bolt is housed in the counterbore groove in the plan view shown in Figure 4A.

[0034] The joint structure 100 of the timber axial members shown in Figure 1 is formed by joining the end grain surface 22 (upper surface) of a lower timber column 20 (an example of a second timber axial member) extending in the Z direction to the lower surface 14 of a timber beam 10 (an example of a first timber axial member) extending in the X direction, and similarly joining the end grain surface 32 (lower surface) of an upper timber column 30 (another example of a second timber axial member) extending in the Z direction to the upper surface 12 of the timber beam 10.

[0035] Refer to Figure 2 for a detailed explanation of each component. Both the wooden beam 10 and the wooden columns 20 and 30 are axial members with a rectangular (square or rectangular) cross-sectional shape perpendicular to their longitudinal directions, namely the X-axis and Z-axis directions.

[0036] The wooden beam 10 is provided with a plurality of (two in the illustrated example) first bolt holes 16 through which the shaft portion 71 of a headed mounting bolt 70, which has a head 75, passes, in a manner that penetrates the upper surface 12 and the lower surface 14.

[0037] A first connecting fitting 40 and a second connecting fitting 50 are connected to the lower surface 14 and upper surface 12 of the wooden beam 10, respectively.

[0038] The first connecting fitting 40 comprises a first connecting piece 41 connected to the lower surface 14 of the wooden beam 10, and a first fitting piece 43 that extends upright from the first connecting piece 41 (in the illustrated example, it extends downwards). The first fitting piece 43 is designed to fit into a receiving groove 26 that extends from the end grain surface 22 of the wooden column 20 of the lower floor into the interior.

[0039] In the first connecting piece 41, second bolt holes 45 are provided at positions corresponding to the two first bolt holes 16. In addition, the first fitting piece 43 has multiple (six in the illustrated example) first pin holes 47 through which the drift pin 60 is inserted.

[0040] On the other hand, the second connecting fitting 50 comprises a second connecting piece 51 connected to the upper surface 12 of the wooden beam 10, and a second fitting piece 53 that extends upright from the second connecting piece 51 (in the illustrated example, it extends upward). The second fitting piece 53 is designed to fit into a receiving groove 36 that extends from the end grain surface 32 of the wooden column 30 of the upper floor into the interior.

[0041] In the second connecting piece 51, third bolt holes 55 are provided at positions corresponding to the two first bolt holes 16. In addition, the second fitting piece 53 has multiple (six in the illustrated example) fourth pin holes 57 through which drift pins 60 are inserted.

[0042] As shown in Figure 2, the first connecting piece 41 of the first connecting fitting 40 is brought into contact with the lower surface 14 of the wooden beam 10 in the X1 direction, and the second connecting piece 51 of the second connecting fitting 50 is brought into contact with the upper surface 12 of the wooden beam 10. At this time, the corresponding first bolt hole 16, second bolt hole 45, and third bolt hole 55 are aligned and connected.

[0043] Then, a headed mounting bolt 70 is inserted through each of the connecting holes in the X2 direction. Here, the headed mounting bolt 70 comprises a shaft portion 71, a tip screw 73 at one end (tip) of the shaft portion 71, and a hexagonal nut-shaped head 75 at the other end of the shaft portion 71, and a nut 77 (hexagonal nut) is screwed onto the tip screw 73.

[0044] The shaft portion 71 of the headed mounting bolt 70 is inserted in the X2 direction through each of the communicating holes, and a nut 77 is screwed onto the tip screw 73 protruding upward from the third bolt hole 55 and tightened, thereby connecting the wooden beam 10 to the first connecting fitting 40 and the second connecting fitting 50 located above and below it.

[0045] For example, in a factory, after connecting the wooden beam 10, the first connecting fitting 40, and the second connecting fitting 50 in this manner, they are transported to the site as a single unit. Alternatively, at the site, these components are assembled in an assembly yard or similar location prior to the installation of the wooden beam 10.

[0046] At the construction site, after the wooden column 20 of the lower floor has been erected, the wooden column 20 and the wooden beam 10 are joined by installing the first connecting fitting 40, which is attached to the lower surface 14 of the wooden beam 10, onto the end surface 22 of the wooden beam 20.

[0047] Here, a receiving groove 26 is provided that accommodates the first fitting piece 43, extending from the end grain surface 22, which is the upper surface of the wooden column 20, into the interior. The receiving groove 26 is a planar slit that penetrates a pair of side surfaces 23 of the wooden column 20.

[0048] On the other hand, the wooden column 20 is provided with a plurality (six in the illustrated example) of second pin holes 27 that penetrate the other pair of sides 24, so that when the first fitting piece 43 is fitted into the receiving groove 26, the corresponding first pin holes 47 and second pin holes 27 are in communication with each other.

[0049] On the end grain surface 22 of the wooden column 20, multiple (two in the illustrated example) counterbore grooves 28 are provided on the left and right sides of the band-shaped storage groove 26, with the end openings 29 of the counterbore grooves 28 facing the end grain surface 22.

[0050] Then, drift pins 60 are inserted in the X6 direction from the side of the wooden column 20 into the communicating first pin holes 47 and second pin holes 27, thereby joining the wooden beam 10 and the wooden column 30 via the first connecting fitting 40.

[0051] The end opening 29 of the counterbore groove 28 provided on the end grain surface 22 of the wooden column 20 is positioned to accommodate the head 75 of the headed mounting bolt 70 that protrudes downward from the first connecting piece 41. When the wooden beam 10 is erected on the end grain surface 22 of the wooden column 20, the heads 75 of the two headed mounting bolts 70 that protrude downward are accommodated in the corresponding counterbore grooves 28.

[0052] Furthermore, above the second connecting piece 51 of the second connecting fitting 50, there is a nut 77 that is screwed onto the tip thread 73 of the headed mounting bolt 70 to tighten the headed mounting bolt 70.

[0053] The wooden column 30 on the upper floor is provided with a receiving groove 36 that extends from its end face 32 into the interior, accommodating the second fitting piece 53 of the second connecting fitting 50. The receiving groove 36 is a planar slit that penetrates a pair of side surfaces 33 of the wooden column 30.

[0054] On the other hand, the wooden column 30 is provided with a plurality (six in the illustrated example) of third pin holes 37 that penetrate the other pair of sides 34, so that when the second fitting piece 53 is fitted into the housing groove 36 in the X7 direction, the corresponding third pin holes 37 and fourth pin holes 57 are in communication with each other.

[0055] On the end face 32 of the wooden column 30, multiple counterbore grooves (two in the illustrated example) are provided on the left and right sides of the band-shaped receiving groove 36, with the end openings of the counterbore grooves facing the end face 32. Drift pins 60 are inserted in the X8 direction from the side of the wooden column 30 into the communicating third pin holes 37 and fourth pin holes 57, thereby joining the wooden beam 10 and the wooden column 30 via the second connecting fitting 50.

[0056] The end opening of the counterbore groove provided on the end grain surface 32 of the wooden column 30 is positioned to accommodate the nut 77 located above the second connecting piece 51. When the wooden beam 10 is erected on the end grain surface 32 of the wooden column 30, the nuts 77 that screw onto the end threads 73 of the two headed mounting bolts 70 are accommodated in the corresponding counterbore grooves.

[0057] Here, the shape and plan dimensions of the end opening 29 of the counterbore groove 28 facing the end grain surface 22 of the wooden column 20, and the shape and plan dimensions of the head 75 of the headed mounting bolt 70 housed in the counterbore groove 28 are as shown in Figure 4B.

[0058] As shown in Figure 4B, the planar shape of the counterbore groove 28 and its end opening 29 is circular. On the other hand, the planar shape of the head 75 of the headed mounting bolt 70 is a regular hexagon, and its planar dimensions are set to be smaller than the planar dimensions of the end opening 29.

[0059] In this way, because the planar dimension of the head 75 of the headed mounting bolt 70 is set to be smaller than the planar dimension of the end opening 29 of the counterbore groove 28, the head 75 of the headed mounting bolt 70 can be smoothly accommodated in the counterbore groove 28 even if there are processing errors in each component or construction errors when erecting the wooden beam 10 on the wooden column 20.

[0060] By the way, when installing a wooden beam 10 onto a wooden column 20, if it is noticed that the fastening with the headed mounting bolt 70 and nut 77 has loosened, the nut 77 will be tightened further. In this tightening process, as shown in Figure 4B, if the planar dimension of the head 75 of the headed mounting bolt 70 is small relative to the counterbore groove 28, and the two do not come into contact or engage, then, for example, when the nut 77 is tightened, both the nut 77 and the headed mounting bolt 70 will rotate together, making it impossible to tighten further.

[0061] Therefore, in order to prevent this rotation, an interference member 80, shown in an enlarged view in Figure 3A, is attached to the end grain surface 22 of the wooden column 20.

[0062] The interference member 80 has an interference piece 81 that is formed by bending the steel plate at two locations and is disposed on the end grain surface 22, and a pair of engaging pieces 83 that are bent at both ends of the interference piece 81.

[0063] In Figure 2, the end grain surface 22 of the wooden column 20 is shown with each of the two interference members 80 having an interference piece 81 that interferes with a portion of the corresponding end opening 29, and the pair of engaging pieces 83 engaging with a pair of sides 23 of the wooden column 20. On the other hand, in Figure 2, the end grain surface 32 of the wooden column 30 is shown with the two interference members 80 similarly fitted in the X4 direction so as to interfere with a portion of the corresponding end opening (not shown), and the pair of engaging pieces 83 are shown before they engage with a pair of sides 33 of the wooden column 30.

[0064] Figure 3B is an enlarged view showing the state in which two interference members 80 are attached to the end grain surface 22 of the wooden column 20, and Figure 4A is a plan view of Figure 3B as seen from direction IV.

[0065] As shown in Figure 4A, with the interference member 80 attached to the wooden column 20 such that a portion of each end opening 29 interferes with the interference piece 81, as shown in Figure 4B, the head 75 of the headed mounting bolt 70 protruding below the first connecting piece 41 of the first connecting fitting 40 connected to the wooden beam 10 is housed in the counterbore groove 28 through the end opening 29.

[0066] As shown in Figure 4B, although a portion of the end opening 29 is blocked by the interference piece 81, the planar dimensions of the remaining portion of the end opening 29 are larger than those of the head 75, and the head 75 is smoothly accommodated in the counterbore groove 28 through the end opening 29.

[0067] Furthermore, when the head 75 is housed in the counterbore groove 28, the head 75 and the interference piece 81 engage with each other. As a result, when the wooden beam 10 is installed on the wooden column 20 of the lower floor and loosening of the headed mounting bolt 70 (and nut 77) is noticed, and rotational force is applied to the nut 77 to tighten the nut 77 that screws onto the tip thread 73 of the headed mounting bolt 70, the head 75 engages with the interference piece 81 and does not rotate, so only the nut 77 can be rotated, and the headed mounting bolt 70 can be tightened while preventing the nut 77 and headed mounting bolt 70 from rotating together.

[0068] Figures 5A and 5B show other examples of interfering members.

[0069] In the illustrated example, the interference member 90 is made by providing cuts 94 on two sides of a thin, strip-shaped interference piece 91 at multiple locations, in a triangular shape or a triangular shape with a curved tip, excluding the base of the triangle. By pushing the inside of the cuts 94 toward one of the wider surfaces 92, multiple triangular or roughly triangular projections 95 are made to protrude from the one wider surface 92.

[0070] As shown in Figure 5B, one wide surface 92 of the interference piece 91 is brought into contact with the end grain surface 22 so as to interfere with a part of the end opening 29, and the other wide surface 93 is pushed in, so that multiple protrusions 95 are inserted into the end grain surface 22, thereby attaching the interference member 90 to the end grain surface 22.

[0071] The above describes a joint structure 100 in which a wooden column 20 on the lower floor and a wooden column 30 on the upper floor are joined to the lower surface 14 and upper surface 12 of a wooden beam 10. However, if the wooden beam 10 is the beam located at the very top of the building, the wooden column 30 is not required, and the second connecting fitting may have only a second connecting piece.

[0072] On the other hand, if the wooden beam 10 is the base, the first connecting fitting is positioned above the base, and the second connecting fitting positioned below the base has only the second connecting piece.

[0073] Furthermore, other embodiments may be used in which other components are combined with the configurations listed in the above embodiments, and the present invention is not limited in any way to the configurations shown herein. In this regard, modifications can be made without departing from the spirit of the present invention, and can be appropriately determined according to the application form. [Explanation of Symbols]

[0074] 10: First timber frame member (wooden beam) 12:Top surface 14: Bottom surface 16: First bolt hole 20: Second timber frame member (timber column, timber column on the lower floor) 22: End grain surface (top surface) 23,24: Side view 26: Storage groove 27: Second pin hole 28: Counterbore groove 29: End opening 30: Separate second wooden structural member (wooden column, wooden column for the upper floor) 32: End grain surface (bottom surface) 33,34: Side view 36: Storage groove 37: Third pin hole 40: First connecting fitting 41: First connecting piece 43: First interlocking piece 45: Second bolt hole 47: First pinhole 50: Second connecting fitting 51: Second connecting piece 53: Second interlocking piece 55: Third bolt hole 57: Fourth pin hole 60: Drift Pin 70: Headed mounting bolts 71: Shaft 73: Screw tip 75: Head 77: Nut 80: Interference member 81: Interference piece 83: Engaging piece 90: Interference member 91: Interference piece 92: One wide surface 93: The other wide surface 95: Protrusion 100: Joint structure (Joining structure for wooden frame members)

Claims

1. It comprises a first wooden shaft member having a first bolt hole through which a headed mounting bolt has a head, and a second wooden shaft member having a receiving groove into which a part of the first connecting fitting fits, The first connecting fitting comprises a first connecting piece connected to the first wooden shaft member, and a first fitting piece that extends from the first connecting piece and fits into the housing groove. A second bolt hole is provided in the first connecting piece at a position corresponding to the first bolt hole. The aforementioned fitting piece is provided with a first pin hole through which a drift pin is inserted. The second connecting fitting further comprises at least a second connecting piece connected to the first wooden shaft member, and a third bolt hole is provided in the second connecting piece at a position corresponding to the first bolt hole. The first connecting fitting and the second connecting fitting are arranged on opposing sides of the first wooden shaft member, and the mounting bolts are inserted through the first bolt hole, the second bolt hole, and the third bolt hole to form a bolted joint. The second wooden shaft member is further provided with a second pin hole at a position corresponding to the first pin hole when the fitting member is fitted into the housing groove. In a joint structure for wooden shaft members, the first wooden shaft member and the second wooden shaft member are joined by inserting the drift pin through the second pin hole corresponding to the first pin hole, Of the second wooden shaft member, the end face that abuts the first connecting piece faces the end of the housing groove and is provided with a counterbore groove into which the head of the headed mounting bolt is housed. The planar dimension of the end opening facing the end grain surface in the aforementioned counterbore groove is set to be larger than the planar dimension of the head. A joining structure for a wooden shaft member, characterized in that an interfering member is attached to the end surface of the wood so as to interfere with a part of the end opening of the counterbore groove, and the interfering member is in contact with the head.

2. The interference member comprises an interference piece disposed on the end grain surface by bending the steel plate at two locations, and a pair of engaging pieces bent at both ends of the interference piece. The joining structure for a wooden shaft member according to claim 1, characterized in that the interfering piece is stretched across the end face of the second wooden shaft member so as to interfere with a part of the end opening, and the pair of engaging pieces are engaged with a pair of opposing sides of the second wooden shaft member.

3. The interference member consists of an interference piece having a plurality of protrusions on one of its wider surfaces. The joining structure for a wooden shaft member according to claim 1, characterized in that the interfering piece is positioned to interfere with a part of the end opening with respect to the end grain surface of the second wooden shaft member, and the projection is inserted into the end grain surface.

4. A groove is provided in the end grain surface in a linear shape that interferes with a part of the counterbore groove. The joining structure for a wooden shaft member according to claim 2 or 3, characterized in that the interference piece is housed in the groove.

5. The second connecting fitting further has a second fitting piece that is erected from the second connecting piece, The joining structure for a wooden shaft member according to claim 1, characterized in that the second fitting piece is fitted into a receiving groove of a separate second wooden shaft member, and the first wooden shaft member and the separate second wooden shaft member are joined together.

6. The joint structure for wooden axial members according to claim 1, characterized in that the first wooden axial member is a wooden beam and the second wooden axial member is a wooden column.

7. The joint structure for wooden axial members according to claim 5, characterized in that the first wooden axial member is a wooden beam, and the second wooden axial member and the separate second wooden axial member are wooden columns.

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