Wood joint structure

Abstract

To improve joint strength in a joint structure between wooden pieces without notches. [Solution] A wooden joint structure 1 joins columnar wooden pieces 21 and 22 via joint surfaces 211, 222 provided at the tips of the pieces of wooden piece 21, and has a first convex portion 4 that protrudes from the joint surface 211 of the wooden piece 21 where it meets the wooden piece 22 towards the wooden piece 22, a first concave portion 6 that is recessed from the joint surface 222 of the wooden piece 22 where it meets the wooden piece 21 in a direction away from the wooden piece 21 and with which the first convex portion 4 engages, and a screw 8 that is screwed into the wooden piece 22, wherein a central axis Lx1 along the longitudinal direction of the wooden piece 21 and a central axis Ly1 along the longitudinal direction of the wooden piece 22 intersect, and when viewed from the direction of the central axis Ly1, the screw 8 is provided in a range that crosses the area that overlaps with the first concave portion 6.

Description

[Technical Field]

[0001] The present invention relates to a joint structure for wood. [Background technology]

[0002] Some buildings constructed using log construction methods have notches at the corners of the buildings where the timbers intersect, protruding outward (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Publication No. 3030044 Summary of the Invention [Problem to be solved by the invention]

[0004] This type of building is sometimes designed without notches for aesthetic reasons, but not having notches can affect the strength of the joints between the pieces of wood. Therefore, there is a demand for improving the joint strength in joint structures between wooden pieces that do not have notches. [Means for solving the problem]

[0005] The present invention provides A wooden joint structure in which a columnar first wooden piece and a columnar second wooden piece are joined via joint surfaces provided at the tips of each other, a first protrusion protruding from a joint surface of the first wooden piece with the second wooden piece toward the second wooden piece; a first recess that is recessed from a joint surface of the second wood piece with the first wood piece in a direction away from the first wood piece and that engages with the first protrusion; a reinforcing member that is screwed into the second wooden piece, a first central axis along the longitudinal direction of the first wood piece and a second central axis along the longitudinal direction of the second wood piece intersect with each other; The reinforcing member is screwed into the second wooden piece in a direction intersecting the second central axis, When viewed from the second central axis direction, the reinforcing member is provided in a range that crosses a region that overlaps with the first recess. [Effects of the Invention]

[0006] According to the present invention, it is possible to improve the joint strength in a joint structure between wooden pieces that do not have a notch. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram illustrating a log house. [Figure 2] FIG. [Figure 3] FIG. 1 is a diagram illustrating a joint surface of wood. [Figure 4] 1 is a diagram illustrating a joining structure of wood. FIG. [Figure 5] 1 is a diagram illustrating a joining structure of wood. FIG. [Figure 6] FIG. 10 is a diagram illustrating another example 1 of a joint structure for wood. [Figure 7] FIG. 10 is a diagram illustrating another example 2 of a joint structure for wood.

[0008] An embodiment will be described below, taking a log house LH having a wooden joint structure 1 as an example. Figure 1 is a diagram illustrating a log house LH. Figure 1(a) is an external view of the log house LH. Figure 1(b) is an enlarged view of area A in Figure 1(a). In Figure 1(b), the outer wall portion 2 is divided in the Z direction to expose the dowels D that connect the frame bodies 20 together. Fig. 2 is a diagram illustrating the exterior wall portion 2. Fig. 2(a) is a schematic diagram of a cross section of the exterior wall portion 2 cut along a horizontal plane. Fig. 2(b) is a diagram illustrating the wooden pieces 21 that make up the exterior wall portion 2. Note that part of the wooden pieces 21 is omitted in Fig. 2(b). 3A and 3B are diagrams illustrating joining surfaces 211 and 212 of a wooden piece 21. (a) of Fig. 3 is a perspective view illustrating the joining surface 212 on the other side of the wooden piece 21. (b) of Fig. 3 is a perspective view illustrating the joining surface 211 on one side of the wooden piece 21.

[0009] In the following explanation, the positional relationship of each element will be explained based on the X, Y, and Z directions shown in Figure 1(a). The Z direction corresponds to the vertical direction (direction of gravity) when the log house LH is installed. The X direction corresponds to the left-right direction of the log house LH when viewed from the front. The Y direction corresponds to the front-to-back direction of the log house LH when viewed from the front. The X and Y directions are directions along the horizontal direction, and are each perpendicular to the Z direction.

[0010] As shown in FIG. 1(a), the log house LH has an outer wall portion 2 and a roof portion 3 that closes an upper opening of the outer wall portion 2. As shown in FIG. 2(a), the outer wall portion 2 according to the embodiment is formed by stacking frame bodies 20, each having a substantially rectangular shape in a plan view, in the Z direction (the front-to-rear direction on the paper in the drawing).

[0011] The frame 20 is made up of a pair of parallel wooden pieces 21 and 23, and a pair of parallel wooden pieces 22 and 24. The pair of wooden pieces 22 and 24 connect the ends of the pair of wooden pieces 21 and 23. As an example, the wooden pieces 21 to 24 are made by processing natural wood such as cedar into pillar shapes.

[0012] In the frame 20 shown in FIG. 2(a), the wooden pieces 21 and 23 are arranged with their central axes Lx1 and Lx2, which extend along the longitudinal direction of the wooden pieces 21 and 23, oriented along the X direction. The wooden pieces 22 and 24 are arranged with their central axes Ly1 and Ly2, which extend along the longitudinal direction of the wooden pieces 22 and 24, oriented along the Y direction. In this embodiment, the central axes Lx1 and Lx2 and the central axes Ly1 and Ly2 are orthogonal to each other (intersect). Therefore, the wooden pieces 21 and 23 are orthogonal to the wooden pieces 22 and 24. In other words, the wooden pieces 21 and 23 intersect with the wooden pieces 22 and 24 at an interior angle of approximately 90° and an exterior angle of 270°.

[0013] In the outer wall portion 2 formed by stacking the frame bodies 20, the inside (inner region Rb) surrounded by the wooden pieces 21-24 becomes the interior of the log house LH, and the outside (outer region Ra) of the wooden pieces 21-24 becomes the exterior of the log house LH (see FIGS. 1(a) and 1(b)). The outer wall portion 2 serves as a partition wall that separates the inner region Rb and the outer region Ra of the log house LH. The wooden pieces 21-24 have side surfaces (inner peripheral surfaces 21b-24b) exposed to the inner region Rb and side surfaces (outer peripheral surfaces 21a-24a) exposed to the outer region Ra.

[0014] 1(b), the wooden pieces 21 to 24 have the same thickness T2 in the Z direction. Furthermore, the wooden pieces 21, 21, 22, 23, 23, and 24 that overlap in the Z direction are connected to one another via dowels D.

[0015] Here, as shown in (a) of Figure 2, in the embodiment, a common joining structure 1 is used to join wood 21 and wood 22, wood 22 and wood 23, wood 23 and wood 24, and wood 24 and wood 21. In the embodiment, as an example, a case will be described in which the joint surfaces 211, 221, 231, 241 at the tip of one side of the wooden pieces 21, 22, 23, 24 in the longitudinal direction have a common shape, and the joint surfaces 212, 222, 232, 242 at the tip of the other side have a common shape. In the following description, each part will be described using the wooden piece 21 as an example, and the joining structure 1 between the wooden piece 21 (first wooden piece) and the wooden piece 22 (second wooden piece) will also be described.

[0016] 2(b), the wooden piece 21 is oriented along the central axis Lx1 (first central axis). A joint surface 211 (on the right side in the drawing) provided at the tip of one side of the wooden piece 21 in the direction of the central axis Lx1 and a joint surface 212 (on the left side in the drawing) provided at the tip of the other side connect the outer peripheral surface 21a and the inner peripheral surface 21b of the wooden piece 21.

[0017] The joint surfaces 211, 212 are inclined toward each other from the outer peripheral surface 21a toward the inner peripheral surface 21b of the wooden piece 21. The joint surfaces 211, 212 are flat surfaces along straight lines Lp, Lq, which are inclined at 45° with respect to the central axis Lx1. The joint surfaces 211, 212 of the wooden piece 21 are inclined in directions perpendicular to each other.

[0018] Two protrusions (first protrusion 4 and second protrusion 5) are provided on the joint surface 211 of the wooden piece 21 with a gap therebetween in the direction of the straight line Lp. The first protrusion 4 is provided at a substantially intermediate position between the outer peripheral surface 21a and the inner peripheral surface 21b in the Y direction.

[0019] The end face 41 of the first protrusion 4 is provided at a position protruding from the joining surface 211 by a height L4 and is a flat surface parallel to the joining surface 211. The first protrusion 4 also has one side face 42 that connects the end face 41 and the joining surface 211 on the inner circumferential surface 21b side, and another side face 43 that connects the end face 41 and the joining surface 211 on the outer circumferential surface 21a side. The width W4 of the one side face 42 and the other side face 43 in the direction of the straight line Lp increases from the joining surface 211 side toward the end face 41 side. In other words, the first protrusion 4 is a dovetail tenon.

[0020] 2(b), in a plan view, the second convex portion 5 is provided at a position offset toward the inner circumferential surface 21b from the first convex portion 4. The second convex portion 5 is provided across the inner circumferential surface 21b and the bonding surface 211. The second protrusion 5 has a side surface 51 that is perpendicular to the central axis Lx1 and a side surface 52 that connects the side surface 51 to the inner circumferential surface 21b. The side surface 52 is flush with the inner circumferential surface 21b.

[0021] As shown in FIG. 3(b), when viewed from the direction of the central axis Lx1, the first convex portion 4 and the second convex portion 5 are provided over the entire length of the wooden piece 21 in the Z direction. The first convex portion 4 and the second convex portion 5 are provided on straight lines Lz1 and Lz2 along the Z direction. The straight lines Lz1 and Lz2 are parallel to each other. The upper ends 4a and 5a of the first convex portion 4 and the second convex portion 5 in the Z direction are flush with the upper surface 21c of the wooden piece 21, and the lower ends 4b and 5b are flush with the lower surface 21d of the wooden piece 21.

[0022] 2(b), two recesses (a first recess 6 and a second recess 7) are provided at an interval in the direction of the straight line Lq on the joining surface 212 of the wooden piece 21. The first recess 6 and the second recess 7 have a shape recessed from the joining surface 212. When viewed from the direction of the central axis Lx1, the first recessed portion 6 and the second recessed portion 7 are provided at positions overlapping with the first protruding portion 4 and the second protruding portion 5, respectively.

[0023] The first recess 6 is provided at a substantially midpoint between the outer peripheral surface 21a and the inner peripheral surface 21b in the Y direction. The first recess 6 has an outer shape corresponding to the shape of the first protrusion 4 rotated 90° clockwise.

[0024] Specifically, the bottom surface 61 of the first recess 6 is recessed by a depth L6 from the joining surface 212 and is a flat surface parallel to the joining surface 212. The depth L6 from the joining surface 212 to the bottom surface 61 of the first recess 6 is slightly deeper than the height L4 from the joining surface 211 to the end surface 41 of the first protrusion 4 (L6>L4).

[0025] The first recess 6 has one side surface 62 connecting the bottom surface 61 and the joining surface 212 on the inner peripheral surface 21b side, and the other side surface 63 connecting the bottom surface 61 and the joining surface 212 on the outer peripheral surface 21a side. A width W6 of the one side surface 62 and the other side surface 63 in the direction of the straight line Lq increases from the joining surface 212 side toward the bottom surface 61 side. This width W6 approximately matches the width W4 of the one side surface 42 and the other side surface 43 of the first protrusion 4 (W6 ≒ W4). In other words, the first recess 6 is a dovetail groove corresponding to the first protrusion 4 (dovetail tenon).

[0026] 2(b), in a plan view, the second recess 7 is provided at a position offset from the first recess 6 toward the inner circumferential surface 21b. The second recess 7 is provided across the inner circumferential surface 21b and the joining surface 212. The second recess 7 has an outer shape corresponding to the shape of the second protrusion 5 rotated 90° clockwise.

[0027] Specifically, the second recess 7 has a side surface 71 that is perpendicular to the inner circumferential surface 21b, and a bottom surface 72 that connects the side surface 71 to the joining surface 212. The bottom surface 72 is perpendicular to the side surface 71 and parallel to the inner circumferential surface 21b.

[0028] As shown in (a) of FIG. 3, when viewed from the direction of the central axis Lx1, the first recess 6 and the second recess 7 are provided over the entire length of the wooden piece 21 in the Z direction. The first recess 6 and the second recess 7 are provided on straight lines Lz3 and Lz4 along the Z direction. The straight lines Lz3 and Lz4 are parallel to each other. Both ends of the first recess 6 and the second recess 7 in the Z direction open to the upper surface 21c and the lower surface 21d of the wooden piece 21, respectively.

[0029] Furthermore, screws 8 are threaded into the second recess 7 as reinforcing members. The screws 8 are threaded members with helical threads provided along the longitudinal direction on the outer periphery of the shaft. In this embodiment, two screws 8, 8 spaced apart in the Z direction are threaded into the second recess 7 in a direction perpendicular to the bottom surface 72. Although not shown, a pilot hole for screwing in a screw 8 may be formed in the bottom surface 72 of the second recess 7. The number of screws 8 is not limited to two. There may be one screw 8, or three or more screws 8. The reinforcing member is not limited to the screw 8. For example, a screw nail may be used.

[0030] 2(b), the screw 8 is screwed into the wooden piece 21 in a direction perpendicular to the central axis Lx1. The tip 8a of the screw 8 is located closer to the outer peripheral surface 21a than the first recess 6. The screw 8 is provided in a position offset from the first recess 6 toward one of the joining surfaces 211, in a range that crosses the first recess 6 from the inner peripheral surface 21b toward the outer peripheral surface 21a.

[0031] Here, the direction of the fibers that make up the wooden piece 21 is approximately the same as the direction of the central axis Lx1. By screwing the screw 8 in a direction perpendicular to the fibers, the spiral peaks and valleys formed between the screw 8 and the wooden piece 21 interlock, increasing the rigidity and strength of the wooden piece 21 in the direction perpendicular to the fibers. This reduces the likelihood of the wooden piece 21 cracking along the fiber direction. Although not explained further, the other wooden pieces 22 to 24 (see FIG. 2(a)) constituting the outer wall 2 also have a first convex portion 4 and a second convex portion 5 on a joint surface provided at the tip of one side, and a first concave portion 6 and a second concave portion 7 on a joint surface provided at the tip of the other side. The same number of screws 8 (for example, two) are screwed into the second concave portions 7 (see FIG. 3(a)).

[0032] 4 and 5 are diagrams illustrating a joining structure 1 for joining wooden pieces 21 and 22. FIG. FIG. 4 shows a state in which the joining surface 211 on one side of the wooden piece 21 and the joining surface 222 on the other side of the wooden piece 22 are spaced apart in the Z direction. FIG. 5 is an enlarged view of region A in FIG. 2(a).

[0033] As shown in FIG. 4, in the joining structure 1 of the wooden pieces 21 and 22, the wooden pieces are joined by overlapping a joining surface 211 on one side of the wooden piece 21 (first wooden piece) and a joining surface 222 on the other side of the wooden piece 22 (second wooden piece).

[0034] In the joining structure 1, the first convex portion 4 and the second convex portion 5 provided on the joining surface 211 on one side of the wooden piece 21 in the direction of the central axis Lx1 (first central axis) and the first recessed portion 6 and the second recessed portion 7 provided on the joining surface 222 on the other side of the wooden piece 22 in the direction of the central axis Ly1 (second central axis) are respectively adapted to engage with each other. Specifically, the first protrusion 4 and the second protrusion 5 of the wooden piece 21 are slid in the Z direction from the lower surface 22d side of the wooden piece 22 to engage with the first recess 6 and the second recess 7 of the wooden piece 22, respectively (in the direction of the outlined arrow in the drawing). The screw 8 is previously screwed into the second recess 7.

[0035] The first protrusion 4 is a dovetail joint, and the first recess 6 is a dovetail groove. As shown in FIG. 5, when the first protrusion 4 is engaged with the first recess 6, the engagement between the first protrusion 4 and the first recess 6 exhibits the effect of a dovetail joint. In the dovetail joint, one side surface 42 and the other side surface 43 of the first protrusion 4 are in full contact with one side surface 62 and the other side surface 63 of the first recess 6, respectively. This allows the wooden pieces 21 and 22 to be firmly joined together.

[0036] As described above, the depth L6 from the bonding surface 212 to the bottom surface 61 of the first recess 6 is slightly deeper than the height L4 from the bonding surface 211 to the end surface 41 of the first protrusion 4 (L6>L4, see Figure 2(b)). This relationship also applies to the wooden pieces 21 and 22. That is, the depth L6 from the joining surface 222 of the wooden piece 22 to the bottom surface 61 of the first recess 6 is slightly deeper than the height L4 from the joining surface 211 of the wooden piece 21 to the end surface 41 of the first protrusion 4. Therefore, as shown in Figure 5, when the first convex portion 4 of the wooden piece 21 is engaged with the first concave portion 6 of the wooden piece 22, a gap CL is formed between the end surface 41 of the first convex portion 4 of the wooden piece 21 and the bottom surface 61 of the first concave portion 6 of the wooden piece 22.

[0037] This allows the joining surfaces 211, 222 of the wooden pieces 21, 22 to be in contact with each other without any gaps. Also, the side surface 52 of the second protrusion 5 and the side surface 71 of the second recess 7, and the side surface 51 of the second protrusion 5 and the bottom surface 72 of the second recess 7 are in contact with each other without any gaps. Therefore, the wooden pieces 21, 22 are joined with each other without any gaps.

[0038] In this state, the joining surface 211 of the wooden piece 21 is inclined 45° to the left from the outer peripheral surface 21a toward the inner peripheral surface 21b. The joining surface 222 of the wooden piece 22 is inclined 45° to the rear from the outer peripheral surface 22a toward the inner peripheral surface 22b.

[0039] Therefore, when the joining surfaces 211 and 222 of the wooden pieces 21 and 22 are placed together, the wooden pieces 21 and 22 are perpendicular to each other. When viewed from the Z direction (a direction perpendicular to the central axis Lx1 and the central axis Ly1), the joint surfaces 211, 222 of the wooden pieces 21, 22 are flat surfaces that extend along a straight line Lm that connects the intersection point between the central axis Lx1 and the central axis Ly1 and the boundary portion 25, which is the contact point between the tips of the wooden pieces 21, 22 on the outer corner side of the intersection angle.

[0040] In this case, it is preferable that the straight line Lm be the bisector of the intersection angle between the wooden pieces 21 and 22. This allows the stress generated around the joint surfaces 211 and 222 of the wooden pieces 21 and 22 to be dispersed evenly.

[0041] In this state, as shown in Figure 1(b), when the corner 2c of the exterior wall 2 is viewed from the outer region Ra, the boundary 25 on the outer peripheral surfaces 21a, 22a of the wooden pieces 21, 22 (the outer corner of the intersection angle) is aligned on a straight line Lz along the Z direction. This gives the corner 2c of the exterior wall 2 a neat impression without any notches, improving the design of the exterior of the log house LH.

[0042] 5, a deforming force due to wind, earthquake, or the like may act between the joined wooden pieces 21 and 22. In this case, a force may act on the first recess 6 of the wooden piece 22 from the first protrusion 4 of the wooden piece 21 in a direction that enlarges the opening of the first recess 6. As a result, stress is concentrated in the wooden piece 22 at a connection 64 between the bottom surface 61 and one side surface 62 of the first recess 6 and at a connection 65 between the bottom surface 61 and the other side surface 63. As a result, the wooden piece 22 may crack along straight lines Ly1a and Ly1b that are parallel to the central axis Ly1, which is the direction of the fibers, starting from the connection portions 64 and 65 of the first recess 6. Therefore, in this embodiment, the screw 8 is screwed into the wood 22 from the bottom surface 72 of the second recess 7. The screw 8 is provided at a position that avoids the first recess 6 and in a direction perpendicular to the central axis Ly1.

[0043] The length L8 of the screw 8 is set so that the tip 8a is located closer to the outer circumferential surface 21a than the first recess 6 when the screw 8 is threaded into the second recess 7. Therefore, the screw 8 is provided in a range that crosses the straight lines Ly1a and Ly1b that pass through the connecting portions 64 and 65 of the first recess 6. In other words, the screw 8 is provided in a range that crosses the region that overlaps with the first recess 6 when viewed from the direction of the central axis Ly1. This increases the rigidity around the connecting portions 64, 65 of the first recess 6 where stress tends to concentrate, and reduces splitting of the wooden piece 22 starting from the connecting portions 64, 65.

[0044] It is preferable that the length L8 of the screw 8 is set so that the tip 8a of the screw 8 does not protrude from the outer peripheral surface 21a of the wooden piece 22. If the tip 8a of the screw 8 protrudes from the outer peripheral surface 21a of the wooden piece 22 and is exposed to the outer region Ra, the screw 8 is susceptible to the environment of the outer region Ra due to a thermal bridge. For example, this is because there is a risk that condensation may occur inside the wooden piece 22 through the screw 8, or that the heat insulating properties of the inner region Rb may be affected.

[0045] Here, for example, when the wooden pieces 21 and 22 are deformed in a direction away from each other (in the direction of the arrow in the drawing) around the boundary 25, a gap may form between the joint surface 211 of the wooden piece 21 and the joint surface 222 of the wooden piece 22. This gap is likely to appear at the boundary 26 on the inner peripheral surfaces 21b and 22b of the wooden pieces 21 and 22 (on the inner corner side of the intersection angle), and is easily noticeable when viewed from the inner region Rb side, which can easily affect the design of the interior of the log house LH.

[0046] Therefore, in this embodiment, when viewed from the Z direction (a direction perpendicular to the central axes Lx1 and Ly1), the second convex portion 5 of the wooden piece 21 is located closer to the interior of the intersection angle between the central axes Lx1 and Ly1 than the first convex portion 4. The second recessed portion 7 of the wooden piece 22 is located closer to the interior of the intersection angle between the central axes Lx1 and Ly1 than the first recessed portion 6. Therefore, the second convex portion 5 and the second recessed portion 7 are engaged with each other closer to the interior of the intersection angle than the first convex portion 4 and first recessed portion 6. As a result, when a gap is formed between the joining surfaces 211, 222 of the wooden pieces 21, 22 and the boundary portion 26 is viewed from the inner region Rb side, the second convex portion 5 is located ahead of the line of sight EP, so that the gap between the joining surfaces 211, 222 of the wooden pieces 21, 22 is hidden.

[0047] In this case, a gap is formed between the side surface 52 of the second protrusion 5 and the side surface 71 of the second recess 7, but it is not noticeable because it is not oriented along the line of sight EP. In this way, by engaging the second protrusion 5 and the second recess 7 on the inner angle side of the intersection angle of the wooden pieces 21, 22, the gap becomes less noticeable when viewed from the inner region Rb, thereby improving the design.

[0048] Furthermore, in the embodiment, when viewed from the Z direction (a direction perpendicular to the central axis Lx1 and the central axis Ly1), the second convex portion 5 is provided across the joining surface 211 of the wooden piece 21 and the inner surface 21b (side surface) located on the inner corner side of the wooden piece 21, and the second concave portion 7 is provided across the joining surface 222 of the wooden piece 22 and the inner surface 22b (side surface) located on the inner corner side of the wooden piece 22. As a result, the inner surface 21b of the wooden piece 21 and the second convex portion 5 are flush with each other, so that when the boundary portion 26 is viewed from the inner region Rb, the second convex portion 5 is less likely to give an uncomfortable feeling even if it is visible.

[0049] Although detailed explanation will be omitted, a common joining structure 1 is also used to join the wooden pieces 22 and 23, the wooden pieces 23 and 24, and the wooden pieces 24 and 21 (see FIG. 2(a)). (i) In the joint structure 1 between the wooden pieces 22 and 23, the wooden piece 22 constitutes the first wooden piece, and the wooden piece 23 constitutes the second wooden piece. The central axis Ly1 of the wooden piece 22 constitutes the first central axis, and the central axis Lx2 of the wooden piece 23 constitutes the second central axis. (ii) In the joint structure 1 between the wooden pieces 23 and 24, the wooden piece 23 constitutes the first wooden piece, and the wooden piece 24 constitutes the second wooden piece. The central axis Lx2 of the wooden piece 23 constitutes the first central axis, and the central axis Ly2 of the wooden piece 24 constitutes the second central axis. (iii) In the joint structure 1 between the wooden pieces 24 and 21, the wooden piece 24 constitutes the first wooden piece, and the wooden piece 21 constitutes the second wooden piece. The central axis Ly2 of the wooden piece 24 constitutes the first central axis, and the central axis Lx1 of the wooden piece 21 constitutes the second central axis.

[0050] The wooden joint structure 1 according to the present invention has the following configuration. (1) A wooden joint structure 1 in which a columnar wooden piece 21 (first wooden piece) and a columnar wooden piece 22 (second wooden piece) are joined via joint surfaces 211 and 222 provided at the ends of the wooden pieces. a first protrusion 4 protruding from a joint surface 211 of the wooden piece 21 with the wooden piece 22 toward the wooden piece 22; a first recess 6 that is recessed from a joint surface 222 of the wooden piece 22 with the wooden piece 21 in a direction away from the wooden piece 21 and that engages with the first protrusion 4; and a screw 8 (reinforcing member) that is screwed into the wood 22. A central axis Lx1 (first central axis) along the longitudinal direction of the wooden piece 21 and a central axis Ly1 (second central axis) along the longitudinal direction of the wooden piece 22 intersect with each other. When viewed from the direction of the central axis Ly1, the screws 8 are provided in a range that crosses the area that overlaps with the first recessed portion 6.

[0051] With this configuration, by screwing the screw 8 in a direction perpendicular to the central axis Ly1 (a direction perpendicular to the fibers), the spiral peaks and valleys formed between the screw 8 and the wood 22 interlock, thereby increasing the rigidity strength of the wood 22 in the direction perpendicular to the fibers. Therefore, by providing the screws 8 in a range that crosses the first recess 6 in a direction perpendicular to the central axis Ly1, it is possible to increase the rigidity around the connection parts 64, 65 of the first recess 6, where stress tends to concentrate. This reduces splitting of the wooden piece 22 starting from the connection parts 64, 65. Therefore, it is possible to realize both improved design due to the absence of notches and improved joint strength between pieces of wood.

[0052] (2) When viewed from the Z direction (a direction perpendicular to the central axis Lx1 and the central axis Ly1), the wooden pieces 21 and 22 have a boundary 25 where their tips come into contact with each other on the outer angle side of the intersection angle between the central axis Lx1 and the central axis Ly1. When viewed from a direction perpendicular to the central axis Lx1 and the central axis Ly1, the joint surfaces 211, 222 are flat surfaces that extend along the straight line Lm that connects the boundary 25, which is the contact point between the tip of the wooden piece 21 and the tip of the wooden piece 22, and the intersection of the central axis Lx1 and the central axis Ly1.

[0053] With this configuration, when the joined wooden pieces 21, 22 are viewed from the outer region Ra, the boundary 25 located on the outer corner side of the intersection angle of the wooden pieces 21, 22 is aligned on a straight line Lz along the Z direction. This gives the impression of a clean corner 2c of the outer wall 2 with no notches formed, improving the design.

[0054] (3) When viewed from the Z direction (a direction perpendicular to the central axes Lx1 and Ly1), the joint surfaces 211 and 222 are flat surfaces along a straight line Lm that bisects the intersecting angle between the central axes Lx1 and Ly1.

[0055] With this configuration, stress generated around the joint surfaces 211, 222 of the wooden pieces 21, 22 can be dispersed evenly.

[0056] (4) The first protrusion 4 is a dovetail joint, and the first recess 6 is a dovetail groove. The engagement between the first protrusion 4 and the first recess 6 is a dovetail joint.

[0057] With this configuration, the wooden pieces 21 and 22 can be firmly joined together.

[0058] (5) The screw 8, which is a reinforcing member, is a threaded member having a helical ridge formed on the outer periphery of the shaft along the longitudinal direction.

[0059] With this configuration, the spiral peaks and valleys formed between the screw 8 and the wooden piece 22 interlock with each other, increasing the rigidity and strength of the wooden piece 22 in the direction perpendicular to the fibers. This reduces the possibility of the wooden piece 22 splitting along the fiber direction due to a deformation force acting from the wooden piece 21 side.

[0060] (6) a second protrusion 5 protruding from a joint surface 211 of the wooden piece 21 with the wooden piece 22 toward the wooden piece 22; The wooden piece 22 has a second recess 7 recessed from a joint surface 222 of the wooden piece 22 with the wooden piece 21 in a direction away from the wooden piece 21, and with which the second protrusion 5 engages. When viewed from a direction perpendicular to the central axis Lx1 and the central axis Ly1, the second convex portion 5 of the wooden piece 21 is located closer to the inner angle of the intersection angle between the central axis Lx1 and the central axis Ly1 than the first convex portion 4. The screw 8 is screwed into the second recess 7 in a direction perpendicular to the central axis Ly1.

[0061] For example, when viewing the boundary 26 of the inner peripheral surfaces 21b, 22b located on the inner side of the intersection angle of the wooden pieces 21, 22 from the inner region Rb, a gap formed between the joining surfaces 211, 222 of the wooden pieces 21, 22 may be visible. This affects the design. Therefore, with the above configuration, when the boundary portion 26 is viewed from the inner region Rb, the gap between the joining surfaces 211, 222 of the wooden pieces 21, 22 is hidden by the second convex portion 5. Therefore, the gap between the joining surfaces 211, 222 of the wooden pieces 21, 22 is no longer difficult to see, and is less likely to affect the design.

[0062] (7) When viewed from the Z direction (a direction perpendicular to the central axis Lx1 and the central axis Ly1), the second convex portion 5 is arranged across the joint surface 211 of the wooden piece 21 and the inner surface 21b (side surface) located on the inner corner side of the wooden piece 21. When viewed from a direction perpendicular to the central axis Lx1 and the central axis Ly1, the second recess 7 is provided across the joint surface 222 of the wooden piece 22 and the inner peripheral surface 22b (side surface) located on the inner corner side of the wooden piece 22.

[0063] With this configuration, the inner peripheral surface 21b of the wooden piece 21 and the side surface 52 of the second protrusion 5 are flush with each other. Therefore, when the boundary portion 26 is viewed from the inner region Rb, the second protrusion 5 is less likely to give an uncomfortable feeling even if it is visible.

[0064] In the above embodiment, the case where the interior angle of the intersection angle between the wooden piece 21 and the wooden piece 22 is 90° has been exemplified, but the invention is not limited to this. Figure 6 is a diagram illustrating another example 1 of a joining structure of wooden pieces. Figure 6(a) is a diagram illustrating a case where the interior angle of the crossing angle between wooden pieces 21 and 22 is greater than 90°. Figure 6(b) is a diagram illustrating a case where the interior angle of the crossing angle between wooden pieces 21 and 22 is less than 90°.

[0065] For example, as shown in Fig. 6(a), the interior angle of the intersection between the straight line Lx1 of the wooden piece 21 and the straight line Ly1 of the wooden piece 22 may be set to an angle greater than 90°. Also, as shown in Fig. 6(b), the interior angle of the intersection between the straight line Lx1 of the wooden piece 21 and the straight line Ly1 of the wooden piece 22 may be set to an angle less than 90°.

[0066] In the embodiment, the first convex portion 4 and the second convex portion 5 are provided on the joint surfaces 211, 221, 231, and 241 on one side of the wooden pieces 21, 22, 23, and 24 in the longitudinal direction, respectively, and the first concave portion 6 and the second concave portion 7 are provided on the joint surfaces 212, 222, 232, and 242 on the other side, respectively (see FIGS. 2(a) and 2(b)). However, the present invention is not limited to this example.

[0067] Fig. 7 is a diagram illustrating another example 2 of a wooden joint structure. Fig. 7(a) is a diagram illustrating an outer wall portion 2. Fig. 7(b) is a diagram illustrating a wooden piece 23A. Fig. 7(c) is a diagram illustrating a wooden piece 21A.

[0068] For example, as shown in Figures 7(a) and 7(c), a first convex portion 4 and a second convex portion 5 may be provided on joining surfaces 211 and 212 on both sides of a wooden piece 21A in the longitudinal direction, respectively. Also, as shown in Figures 7(a) and 7(b), a first recessed portion 6 and a second recessed portion 7 may be provided on joining surfaces 231 and 232 on both sides of a wooden piece 23A in the longitudinal direction, respectively.

[0069] 7(a), wooden pieces 22A and 24A connecting the ends of wooden pieces 21A and 23A have a first convex portion 4 and a second convex portion 5 on joint surfaces 221 and 242 with wooden piece 23A, respectively. Furthermore, wooden pieces 22A and 24A have a first recessed portion 6 and a second recessed portion 7 on joint surfaces 222 and 241 with wooden piece 21A, respectively.

[0070] In this way, the joint structure 1 can be used to join the wooden pieces 21A and 22A, the wooden pieces 22A and 23A, the wooden pieces 23A and 24A, and the wooden pieces 24A and 21A.

[0071] In the above-described embodiment, the wooden joint structure 1 is applied to a log house LH. However, the present invention is not limited to this. For example, the wooden joint structure 1 can be applied to wooden buildings other than log houses, furniture, etc.

[0072] The present invention is not limited to the above-described embodiment, and can be modified as appropriate within the scope of the technical concept of the invention. [Explanation of symbols]

[0073] 1:Joint structure 2: Exterior wall 3: Roof 4: First convex part 5: Second convex part 6: First recess 7: Second recess 8: Screws (reinforcement parts) 20:Frame body 21: Wood (first wood) 21a: Outer surface (side surface on outer corner) 21b: Inner surface (side surface on the inner corner side) 22: Wood (second wood) 22a: Outer surface (side surface on outer corner) 22b: Inner surface (side surface on the inner corner) 23:Wood 23a: Outer surface 23b: Inner surface 24:Wood 24a: Outer surface 24b: Inner surface 25: Boundary 26: Boundary 211: Joint surface 212: Joint surface 211: Joint surface 222: Joint surface 231: Joint surface 232: Joint surface 241: Joint surface 242: Joint surface EP: Gaze LH: Log house Lm: Straight line Lx1: Center axis (1st center axis) Lx2: Center axis Ly1: Central axis (second central axis) Ly2: Central axis

Claims

1. A wooden joint structure in which a columnar first wooden piece and a columnar second wooden piece are joined via joint surfaces provided at the tips of each other, a first protrusion protruding from the joint surface of the first wooden piece with the second wooden piece toward the second wooden piece; a first recess that is recessed from the joint surface of the second wooden piece with the first wooden piece in a direction away from the first wooden piece and that engages with the first protrusion; a reinforcing member that is screwed into the second wooden piece, a first central axis along the longitudinal direction of the first wooden piece and a second central axis along the longitudinal direction of the second wooden piece intersect with each other; The reinforcing member is screwed into the second wooden piece in a direction intersecting the second central axis, A wood joining structure characterized in that, when viewed from the second central axis direction, the reinforcing member is arranged in a range that crosses the area that overlaps with the first recess.

2. In claim 1, When viewed from a direction perpendicular to the first central axis and the second central axis, the first wooden piece and the second wooden piece are in contact with each other at tips on the outer angle side of the intersection angle between the first central axis and the second central axis, A wooden joining structure characterized in that, when viewed from a direction perpendicular to the first central axis and the second central axis, the joining surface is a flat surface that follows a straight line connecting the contact point between the tip of the first wooden piece and the tip of the second wooden piece and the intersection point of the first central axis and the second central axis.

3. In claim 2 A wood joining structure characterized in that, when viewed from a direction perpendicular to the first central axis and the second central axis, the joining surface is a flat surface along a straight line that bisects the intersection angle between the first central axis and the second central axis.

4. In claim 3, the first protrusion is a dovetail and the first recess is a dovetail groove, A wood joining structure, characterized in that the engagement between the first convex portion and the first concave portion is a dovetail joint.

5. In claim 4 A wood joining structure characterized in that the reinforcing member is a screw member having a spiral ridge provided on the outer periphery of the shaft along the longitudinal direction.

6. In any one of claims 1 to 5, a second protrusion protruding from the joint surface of the first wooden piece with the second wooden piece toward the second wooden piece; a second recess that is recessed from the joint surface of the second wooden piece with the first wooden piece in a direction away from the first wooden piece and that engages with the second protrusion, When viewed from a direction perpendicular to the first central axis and the second central axis, the second convex portion is located closer to an inner angle of an intersection angle between the first central axis and the second central axis than the first convex portion, A wood joining structure, characterized in that the reinforcing member is screwed into the second recess in a direction perpendicular to the second central axis.

7. In claim 6, When viewed from a direction perpendicular to the first central axis and the second central axis, the second convex portion is provided across the joint surface of the first wooden piece and a side surface of the first wooden piece located on the inner corner side, A wooden joining structure characterized in that, when viewed from a direction perpendicular to the first central axis and the second central axis, the second recess is provided across the joining surface of the second wooden piece and the side surface of the second wooden piece located on the inner corner side.

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