JP7803208B2 - Joint structure - Google Patents

Description

The present invention relates to a joining structure.

As a joining structure for joining wooden members (boards), for example, Patent Document 1 discloses a joining structure that uses dovetail joints and wooden plugs (engaging members) to avoid the use of metal fittings.

Japanese Patent Application Laid-Open No. 2021-143461

If the wooden plug can only be inserted in one direction (axial direction), it may be possible to prevent it from coming out in the direction perpendicular to the insertion direction, but it may not be possible to prevent it from coming out in the insertion direction.

The present invention was made in light of these issues, and its purpose is to create a joining structure that reliably prevents disconnection.

The main invention for achieving the above object is a joining structure between a first joining portion of a first member and a second joining portion of a second member, wherein the first joining portion has a first convex portion including a first recessed portion along a predetermined direction and a second recessed portion along a cross direction that crosses the predetermined direction and intersects with the first recessed portion, and a first recessed portion; the second joining portion has a second convex portion that fits into the first recessed portion and includes a third recessed portion along the predetermined direction and a fourth recessed portion along the cross direction and intersects with the third recessed portion; and a first engagement member that is inserted into a first hole formed by the first recess and the third recess and engages with the first protrusion and the second protrusion to prevent the adjacent first protrusion and the second protrusion from separating in the intersecting direction; and a second engagement member that is inserted into a second hole formed by the second recess and the fourth recess and engages with the second protrusion to prevent the adjacent first protrusion and the second protrusion from separating in the predetermined direction, wherein the first engagement member and the second engagement member are in contact with each other.

Other features of the present invention will become apparent from the description of this specification and the accompanying drawings.

The present invention makes it possible to realize a joining structure that reliably prevents disconnection.

1 is a schematic perspective view showing a structure 1 of the present embodiment. FIG. 2 is an exploded perspective view of FIG. 1; FIG. 2 is a perspective view of a joint portion between a first member 10 and a second member 20. FIG. 4 is an exploded perspective view of FIG. 3 . FIG. 2 is a perspective view of a joint portion between a first member 10 and a third member 30. FIG. 6 is an exploded perspective view of FIG. 5 . 7A to 7C are diagrams showing examples of joining wooden plugs. FIG. 10 is a schematic perspective view showing a modified structural body 1'. FIG. 10 is a diagram showing a comparison of performance depending on the cross-sectional shape.

At least the following points become clear from this specification and the accompanying drawings.

A joining structure between a first joint portion of a first member and a second joint portion of a second member, wherein the first joint portion has a first convex portion including a first recessed portion along a predetermined direction and a second recessed portion along a cross direction that crosses the predetermined direction and intersects with the first recessed portion, and a first recessed portion; the second joint portion has a second convex portion that fits into the first recessed portion and includes a third recessed portion along the predetermined direction and a fourth recessed portion along the cross direction and intersects with the third recessed portion, and a second recessed portion that fits into the first convex portion. a first engagement member that is inserted into a first hole formed by the first recessed portion and the third recessed portion and engages to prevent the adjacent first and second protrusions from separating in the intersecting direction; and a second engagement member that is inserted into a second hole formed by the second recessed portion and the fourth recessed portion and engages to prevent the adjacent first and second protrusions from separating in the predetermined direction, wherein the first engagement member and the second engagement member are in contact.

This type of joint structure ensures reliable prevention of disconnection.

In such a joining structure, it is desirable that the contact portions between the first engaging member and the second engaging member are bonded.

This type of joining structure prevents the engaging member from falling off.

In such a joining structure, the first engaging member may have a hole formed in its side surface, and the tip of the second engaging member may be press-fitted into the hole of the first engaging member.

This type of joining structure prevents the engaging member from falling off.

In such a joining structure, the first engaging member may have a threaded hole formed in its side surface, and the second engaging member may have a threaded portion at least at its tip that corresponds to the threaded hole, and the threaded hole of the first engaging member may be threadedly engaged with the threaded portion of the second engaging member.

This type of joining structure prevents the engaging member from falling off.

In such a joining structure, it is desirable that the first joining portion has a plurality of alternating first convex portions and a plurality of alternating first concave portions, the second joining portion has a plurality of alternating second convex portions and a plurality of alternating second concave portions, the first concave portion and the second concave portion are formed on both sides of the first convex portion, the third concave portion and the fourth concave portion are formed on both sides of the second convex portion, the first engaging member is inserted into the first hole formed in the adjacent first convex portion and the second convex portion, and the second engaging member is inserted into the second hole formed in the adjacent first convex portion and the second convex portion, respectively.

This type of joining structure allows for a more secure joining.

One embodiment of the present invention will be described below with reference to the drawings.

===Present Embodiment===
<Regarding Structure 1>
FIG. 1 is a schematic perspective view showing a structure 1 of this embodiment, and FIG. 2 is an exploded perspective view of FIG. 1. FIG. 3 is a perspective view of a joint portion between a first member 10 and a second member 20, and FIG. 4 is an exploded perspective view of FIG. 3. FIG. 5 is a perspective view of a joint portion between a first member 10 and a third member 30, and FIG. 6 is an exploded perspective view of FIG. 5. In this embodiment, as shown in the figures, three mutually orthogonal directions (X direction, Y direction, and Z direction) are defined. The Z direction is the vertical direction (up-down direction), with the upper side of the vertical direction being defined as "up" and the lower side of the vertical direction being defined as "down". The X direction and Y direction are horizontal directions.

The structure 1 of this embodiment has a joining structure for joining plate materials (first member 10, second member 20, and third member 30). Wooden plugs 40, 50 are used at the joints between each member. In this embodiment, the structure 1 is a wooden pillar that stands upright in the Z direction (vertical direction).

<Regarding the first member 10>
The first member 10 is a substantially rectangular wooden board (e.g., CLT (Cross Laminated Timber)) and is arranged so that its length is along the Z direction, its width is along the X direction, and its thickness is along the Y direction. As shown in Fig. 2, the first member 10 includes a main body portion 10a that forms the main body, and a joint portion 10b for joining to other members (here, the second member 20 and the third member 30).

A pair of joints 10b (corresponding to first joints) are provided on both side surfaces of the main body 10a in the width direction (X direction). Each of the pair of joints 10b has multiple protrusions 11 and multiple recesses 12. The protrusions 11 and recesses 12 are arranged alternately in the Z direction.

The protrusion 11 (corresponding to the first protrusion) protrudes outward (outward in the X direction) from the main body 10a. The protrusion 11 is generally rectangular in plan view (viewed in the Y direction). Furthermore, as shown in Figure 2 and other figures, the protrusion 11 has a recess 13 and a recess 14 on both sides in the Z direction.

The recessed portion 13 (corresponding to the first recessed portion) is provided along the thickness direction (corresponding to a specific direction: here, the Y direction) of the first member 10 (protruding portion 11). The recessed portion 13 is formed by cutting out a semicircular notch in the protruding portion 11, and is therefore recessed in a semicircular shape into the inside of the protruding portion 11. In the protruding portion 11, the recessed portion 13 is provided continuously from one end to the other end in the Y direction.

The recessed portion 14 is provided along the width direction of the first member 10 (corresponding to the cross direction: here, the X direction). The recessed portion 14 also intersects with the recessed portion 13. The recessed portion 14 is also formed by cutting out a semicircular notch in the protruding portion 11, and therefore recesses in a semicircular shape into the inside of the protruding portion 11.

The recess 12 (corresponding to the first recess) is a space provided between adjacent protrusions 11 and has approximately the same shape as the protrusions 11 (approximately rectangular in plan view).

<Regarding the second member 20>
The second member 20 is a plate material similar to the first member 10, and is arranged so that its longitudinal direction is along the Z direction, its width direction is along the Y direction, and its thickness direction is along the X direction. That is, the second member 20 is at a 90-degree angle with respect to the first member 10 (the angle between the second member 20 and the first member 10 is a right angle). Also, as shown in Fig. 2, the second member 20 includes a main body portion 20a that constitutes the main body, and a joining portion 20b for joining to another member (here, the first member 10).

The joint 20b (corresponding to the second joint) is provided on one side surface of the main body 20a in the width direction (Y direction). The joint 20b has multiple protrusions 21 and multiple recesses 22. The protrusions 21 and recesses 22 are arranged alternately in the Z direction.

The protrusion 21 (corresponding to the second protrusion) protrudes outward (toward the Y direction) from the main body 20a. The protrusion 21 is generally rectangular in plan view (viewed in the X direction). Furthermore, as shown in Figures 2 and 4, the protrusion 21 has a recess 23 and a recess 24 on both sides in the Z direction.

The recessed portion 23 (corresponding to the third recessed portion) is provided along the width direction (here, the Y direction) of the second member 20. The recessed portion 23 is formed by cutting out a semicircular notch in the protruding portion 21, and is therefore recessed in a semicircular shape into the inside of the protruding portion 21. The recessed portion 23 is provided continuously in the protruding portion 21 from one end to the other end in the Y direction.

The recessed portion 24 (corresponding to the fourth recessed portion) is provided along the thickness direction (here, the X direction) of the second member 20. The recessed portion 24 also intersects with the recessed portion 23. The recessed portion 24 is also formed by cutting out a semicircular shape from the protruding portion 21, and is therefore recessed in a semicircular shape into the inside of the protruding portion 21. The recessed portion 24 is provided so as to face the recessed portion 14 of the first member 10.

The recess 22 (corresponding to the second recess) is a space provided between adjacent protrusions 21 and has approximately the same shape as the protrusions 21 (approximately rectangular in plan view).

<Regarding the third member 30>
The third member 30 is a plate material similar to the first member 10 and the second member 20, and is arranged so that its longitudinal direction is along the Z direction, its width direction is along the Y direction, and its thickness direction is along the X direction. That is, the third member 30 is parallel to the second member 20 and has an angle of 90 degrees with respect to the first member 10 (the angle formed between the third member 30 and the first member 10 is a right angle). Also, as shown in FIG. 2 , the third member 30 includes a main body portion 30a that constitutes the main body, and a joining portion 30b for joining to another member (here, the first member 10).

The joint portion 30b is provided on one side of the main body portion 30a in the width direction (Y direction). The joint portion 30b has multiple protrusions 31 and multiple recesses 32. The protrusions 31 and recesses 32 are arranged alternately in the Z direction.

The protrusion 31 protrudes outward (in the Y direction) from the main body 30a. The protrusion 31 is generally rectangular in plan view (when viewed in the X direction). As shown in Figures 2 and 6, the protrusion 31 has a recess 33 and a recess 34 on both sides in the Z direction.

The recessed portion 33 is provided along the width direction (here, the Y direction) of the third member 30. The recessed portion 33 is formed by cutting out a semicircular notch in the protruding portion 31, and therefore is recessed in a semicircular shape into the inside of the protruding portion 31. The recessed portion 33 is provided continuously in the protruding portion 31 from one end to the other end in the Y direction.

The recessed portion 34 is provided along the thickness direction (here, the X direction) of the third member 30. The recessed portion 34 also intersects with the recessed portion 33. The recessed portion 34 is also formed by cutting out the protruding portion 31 in a semicircular shape, and therefore recesses in a semicircular shape into the inside of the protruding portion 31.

The recesses 32 are spaces provided between adjacent protrusions 31 and have approximately the same shape as the protrusions 31 (roughly rectangular in plan view).

<About wooden plugs 40 and 50>
The wooden plug 40 is inserted (placed) along the Y direction in a hole H1 (see FIG. 3) formed by the recess 13 of the first member 10 and the recess 23 of the second member 20, and prevents separation (separation in the X direction) between adjacent protrusions 11 and 21 by engaging with the hole H1. The hole H1 corresponds to the first hole, and the wooden plug 40 inserted into the hole H1 corresponds to the first engaging member.

The wooden plug 40 is inserted along the Y direction into the hole H3 (see Figure 5) formed by the recess 13 of the first member 10 and the recess 33 of the third member 30, and prevents separation (separation in the X direction) between adjacent protrusions 11 and 31 through engagement.

Hole H1 is a circular hole formed by recesses 13 and 23, and hole H3 is a circular hole (having the same shape as hole H1) formed by recesses 13 and 33. For this reason, wooden plug 40 is a member with a circular (cylindrical) cross section so that it can be properly fitted into holes H1 and H3.

The wooden plug 50 is inserted along the X direction into the hole H2 (see Figure 3) formed by the recess 14 of the first member 10 and the recess 24 of the second member 20, and prevents separation (separation in the Y direction) between adjacent protrusions 11 and 21 through engagement. Hole H2 corresponds to the second hole, and the wooden plug 50 inserted into hole H2 corresponds to the second engagement member.

The wooden plug 50 is inserted along the X direction into the hole H4 (see Figure 5) formed by the recess 14 of the first member 10 and the recess 34 of the third member 30, and prevents separation (separation in the Y direction) between adjacent protrusions 11 and 31 through engagement.

Hole H2 is a circular hole formed by recesses 14 and 24, and hole H4 is a circular hole (with the same shape as hole H2) formed by recesses 14 and 34. The lengths (lengths in the X direction) of holes H2 and H4 are shorter than the lengths (lengths in the Y direction) of holes H1 and H3. Therefore, wooden plug 50 is shorter than wooden plug 40 and has a circular (cylindrical) cross section so that it can be properly fitted into holes H2 and H4.

Furthermore, as mentioned above, recess 14 intersects with recess 13, and recess 24 intersects with recess 23. Therefore, hole H2 formed by recess 14 and recess 24 communicates with hole H1 formed by recess 13 and recess 23. This allows wooden plug 40 inserted into hole H1 to come into contact with wooden plug 50 inserted into hole H2.

Furthermore, recess 14 intersects with recess 13, and recess 34 intersects with recess 33. Therefore, hole H4 formed by recess 14 and recess 34 is connected to hole H3 formed by recess 13 and recess 33. This allows wooden plug 40 inserted into hole H3 to come into contact with wooden plug 50 inserted into hole H4.

<Method of forming the joint>
Next, an example of a method for forming the joint portion will be described. Note that, here, a method for forming the joint portion 10b of the first member 10 will be described.

First, prepare the first member 10 before processing (when the joint 10b has not yet been formed), and then accurately drill circular holes in predetermined longitudinal positions (positions corresponding to the recesses 13 and 14) using a drill or similar tool. Specifically, for the recess 13, a hole (a through hole in this embodiment) is drilled along the thickness direction of the first member 10, and for the recess 14, a hole is drilled along the width direction (at the above-mentioned predetermined position) so as to intersect with the hole.

Then, using an automatic processing machine or the like, uneven processing is performed, and all parts other than the convex portion 11 (i.e., the area of the concave portion 12) are cut away. At this time, the cut is made across the hole made with the drill or the like, leaving half (a semicircle) of the convex portion. This forms the convex portion 11 with semicircular depressions (depressions 13, 14) on two sides, and the joint portion 10b with the depression 12.

The same method is used to form the joint 20b of the second member 20 and the joint 30b of the third member, so explanations will be omitted.

In this embodiment, the angles between each member (plate) are right angles, so there is no need for angled machining. This makes it easy to process and join each member (each joint).

<About joining each component>
4, one joint 10b of the first member 10 is mated with one joint 20b of the second member 20 while the first member 10 and the second member 20 are at a 90-degree angle. That is, the convex portion 11 of the joint 10b is mated with the concave portion 22 of the joint 20b, and the convex portion 21 of the joint 20b is mated with the concave portion 12 of the joint 10b.

At this time, the recessed portion 13 of the protrusion 11 and the recessed portion 23 of the protrusion 21 form a circular hole H1 that runs along the thickness direction of the first member 10 (here, the Y direction). Furthermore, the recessed portion 14 of the protrusion 11 and the recessed portion 24 of the protrusion 21 form a circular hole H2 that runs along the width direction of the first member 10 (here, the X direction) and communicates with hole H1.

Then, wooden plug 40 is inserted into the formed hole H1. Furthermore, wooden plug 50 is inserted into hole H2 and abuts (contacts) with wooden plug 40. Similarly, wooden plugs 40 and 50 are inserted (placed) into all holes H1 and H2 of joints 10b and 20b. This joins joints 10b and 20b.

Next, the first member 10 and the third member 30 are joined in the same manner. That is, as shown in Figure 6, the first member 10 and the third member 30 are aligned at a 90-degree angle, and the other joint 10b of the first member 10 is mated with the joint 30b of the third member 30. That is, the convex portion 11 of the joint 10b is mated with the concave portion 32 of the joint 30b, and the convex portion 31 of the joint 30b is mated with the concave portion 12 of the joint 10b.

At this time, the recessed portion 13 of the protrusion 11 and the recessed portion 33 of the protrusion 31 form a circular hole H3 that runs along the thickness direction of the first member 10 (here, the Y direction). Furthermore, the recessed portion 14 of the protrusion 11 and the recessed portion 34 of the protrusion 31 form a circular hole H4 that runs along the width direction of the first member 10 (here, the X direction) and communicates with hole H3.

Then, wooden plug 40 is inserted into the formed hole H3. Furthermore, wooden plug 50 is inserted into hole H4 and abuts (contacts) with wooden plug 40. Similarly, wooden plugs 40 and 50 are inserted (placed) into all holes H and H4 of joints 10b and 30b. This joins joints 10b and 30b.

As a result, the first member 10, second member 20, third member 30, wooden plug 40, and wooden plug 50 are integrated to form the structure 1.

Here, if only one of the wooden plugs 40 and 50 is provided at one joint (for example, the joint between the first member 10 and the second member 20) (if only one of the holes H1 and H2 is formed), there is a risk that the members will not be properly prevented from coming loose.

Specifically, if only a hole H1 is formed at the joint between the first member 10 and the second member 20, and the wooden plug 40 is inserted (placed) in the Y direction through this hole H1, the first member 10 (protrusion 11) and the second member 20 (protrusion 21) will not easily come loose in the X direction. However, the wooden plug 40 is likely to come loose in the axial direction (Y direction). In this way, while the wooden plug can be properly prevented from coming loose in the direction perpendicular to the insertion direction (axial direction of the wooden plug), there is a risk that it may not be properly prevented from coming loose in the insertion direction.

In contrast, in this embodiment, a hole H1 (H3) along the Y direction and a hole H2 (H4) along the X direction are provided at one joint, and wooden plugs 40 and 50 are inserted (positioned) into them so that they abut (contact) each other. This allows for appropriate prevention of slippage in both the X and Y directions, ensuring reliable prevention.

Furthermore, joining the wooden plugs 40 and 50 will ensure a more reliable prevention of dislodging.

Figures 7A to 7C are diagrams showing examples of joining wooden plugs. Note that in Figures 7A to 7C, illustrations of anything other than the wooden plugs are omitted (only the wooden plugs are shown).

In Figure 7A, the contact areas between wooden plugs 40 and 50 are bonded using adhesive or the like. This makes it possible to more reliably prevent them from coming loose. It also prevents the wooden plugs from falling off.

In Figure 7B, wooden plugs 40' and 50' are used. Wooden plug 40' has a larger diameter than wooden plug 50', and has a hole 41 formed on its side that is slightly smaller in diameter than wooden plug 50'. Wooden plug 50' (tip portion) is press-fit into this hole 41 using a hammer or similar tool. This joins wooden plug 40' and wooden plug 50'.

In addition, Figure 7C shows wooden plugs 40" and 50". Wooden plug 40" has a larger diameter than wooden plug 50", and has a threaded hole 42 (female thread) formed on its side. Wooden plug 50" also has a threaded portion 52 (male thread) formed at its tip that corresponds to the threaded hole 42 of wooden plug 40". Wooden plugs 40" and 50" are joined by threading the threaded portion 52 of wooden plug 50" into the threaded hole 42 of wooden plug 40". In this embodiment, the threaded portion 52 is formed only at the tip of wooden plug 50', but this is not limited to this and may be provided along the entire length of wooden plug 50', for example.

<Modification>
8 is a schematic perspective view showing a modified structure 1'. The structure 1' includes a first member 10, a second member 20', and a third member 30'. In this modified structure, two first members 10 are used.

The second member 20' has a pair of joints 20b with the first member 10 (joints 10b) on both sides in the width direction (Y direction).

The third member 30' also has a pair of joints 30b with the first member 10 (joints 10b) on both sides in the width direction (Y direction).

Then, structure 1' is formed by joining two first members 10, a second member 20', and a third member 30' in a rectangular shape as shown in the figure. The joining of each member (joining structure) is the same as in the previously described embodiment, so a description will be omitted. Structure 1' of this modified example is a structure with a closed cross section, with a hollow portion S formed inside.

<About cross-sectional performance>
9 is a diagram showing a comparison of performance depending on the cross-sectional shape, where the size (numbers) shown in the diagram are in mm.

Here, the cross-sectional area (A) and second moment of area (I) are calculated for a comparative example (full-waist cross-section) in which the rectangular cross-section is made entirely of wood, the present embodiment (Structure 1) with a U-shaped cross-section (open cross-section), and a modified example (Structure 1') with a square-shaped cross-section (closed cross-section). Furthermore, for Structure 1, the second moment of area in the X-axis direction (Ix) and the second moment of area in the Y-axis direction (Iy) are calculated.

The numbers in parentheses below the cross-sectional area (A) and second moment of area (I) in the figure indicate the ratio to the comparative example (full-waist cross-section) (values when the comparative example is set to 1.0).

In this embodiment (Structure 1), the cross-sectional area (A) is less than half (44%) of that of the comparative example, while the second moment of area (Ix, Iy) is 60-70% of that of the comparative example. In other words, even when the cross-sectional area is reduced to less than half, the second moment of area does not decrease as much as the cross-sectional area (a reduction of approximately 25-40%). Therefore, it can be said that high rigidity and strength can be achieved with a small cross-sectional area.

Furthermore, in the modified example (Structure 1'), the cross-sectional area (A) is approximately half (55%) of that of the comparative example, while the second moment of area (I) is 80% of that of the comparative example. In other words, even if the cross-sectional area is reduced by approximately half, the second moment of area is only reduced by 20%. This allows for further increases in rigidity and strength.

In this way, this embodiment and its modified examples make it possible to achieve a highly rigid and strong structure while reducing the amount of wood used. Furthermore, since processing can be done using automatic processing machines, it is easy to install, is less expensive than joint structures that use metal fittings or adhesives, and there is less risk of deterioration.

===Other Embodiments===
The above-described embodiments are intended to facilitate understanding of the present invention and are not intended to limit the present invention. The present invention may be modified or improved without departing from the spirit thereof, and it goes without saying that the present invention includes equivalents thereof. In particular, the embodiments described below are also included in the present invention.

In the above-described embodiment, structure 1 (and structure 1') are pillars, but this is not limited to this. For example, they may be beams. That is, the Z direction may be horizontal (the X or Y direction may be vertical). In this case, however, if the wooden plugs (wooden plugs 40 or 50) are placed on the lower side (facing downward) in the vertical direction, there is a risk that the wooden plugs may fall out. Therefore, in this case, it is desirable to join wooden plugs 40 and 50 as shown in Figures 7A to 7C. This will prevent them from falling out.

In addition, in the above-described embodiment, the wooden plugs 40, 50 (and holes H1-H4) have a circular cross section, but this is not limited to this. For example, the cross section may be rectangular (with adjacent sides of different lengths), or the cross section may be square.

In addition, in the above-described embodiment, the angle between the second member 20 and the first member 10 and the angle between the third member 30 and the first member 10 were both right angles (the second member 20 and the third member 30 were joined at a 90-degree angle to the first member 10), but this is not limited to this.

For example, the angle between the second member 20 and the first member 10, and the angle between the third member 30 and the first member 10 may both be acute angles (angles greater than 0 degrees and less than 90 degrees). In this case, the ends of each member may be beveled, and similar uneven joints may be formed on the end of the second member 20 opposite joint 20b and the end of the third member 30 opposite joint 30b, and these ends may be joined together to form a triangular prism with a triangular (closed) cross section and a hollow portion. In this case, a highly rigid and strong structure can be achieved while reducing the amount of wood used.

Furthermore, the angle between the second member 20 and the first member 10, and the angle between the third member 30 and the first member 10 may both be obtuse angles (angles greater than 90 degrees and less than 180 degrees). Even in this case, rigidity and strength can be increased compared to when there is no angle.

In addition, while the above-described embodiment described joining three members (first member 10, second member 20, and third member 30), this is not limited to this, and two members may be joined. For example, the joining structure of this embodiment may be applied to the joint between a floor and a wall. In this case, the joint 10b of the first member 10 only needs to be provided on one side in the width direction (it does not have to be a pair).

1 Structure 10 First member 10a Main body 10b Joint (first joint)
11 convex portion (first convex portion)
12 Recess (first recess)
13 Recessed portion (first recessed portion)
14 Recessed portion (second recessed portion)
20 Second member 20a Main body 20b Joint (second joint)
21 convex portion (second convex portion)
22 Recess (second recess)
23 Recessed portion (third recessed portion)
24 Recessed portion (fourth recessed portion)
30 Third member 30a Main body 30b Joint 31 Convex 32 Concave 33 Depressed 34 Depressed 40 Wooden plug (first engaging member)
41 Hole 42 Screw hole 50 Wooden plug (second engagement member)
52 Threaded portion H1 hole (first hole)
H2 hole (second hole)
H3 Hole H4 Hole S Hollow part

Claims (5)

A joining structure between a first joining portion of a first member and a second joining portion of a second member,
The first joint portion is
a first protrusion including a first recessed portion along a predetermined direction and a second recessed portion along a cross direction that crosses the predetermined direction and intersects with the first recessed portion;
A first recess;
and
The second joint portion is
a second protrusion including a third recessed portion that fits into the first recessed portion and is aligned with the predetermined direction, and a fourth recessed portion that is aligned with the intersecting direction and intersects with the third recessed portion;
a second recess that fits into the first protrusion;
and
a first engagement member that is inserted into a first hole formed by the first recessed portion and the third recessed portion and that engages with the first protruding portion and the second protruding portion to prevent the adjacent first protruding portion and the adjacent second protruding portion from separating in the intersecting direction;
a second engagement member that is inserted into a second hole formed by the second recessed portion and the fourth recessed portion and that engages with the first protrusion and the second protrusion to prevent the adjacent first protrusion and the second protrusion from separating in the predetermined direction;
wherein the first engagement member and the second engagement member are in contact with each other.
A joining structure characterized by: The joining structure according to claim 1,
a contact portion between the first engaging member and the second engaging member being bonded;
A joining structure characterized by: The joining structure according to claim 1,
The first engagement member has a hole formed in a side surface,
a tip end of the second engaging member is press-fitted into the hole of the first engaging member;
A joining structure characterized by: The joining structure according to claim 1,
The first engagement member has a screw hole formed on a side surface thereof,
the second engaging member has a threaded portion at least at a tip end thereof that corresponds to the threaded hole,
The screw hole of the first engagement member and the screw portion of the second engagement member are threadedly engaged with each other.
A joining structure characterized by: The joining structure according to any one of claims 1 to 4,
the first joint portion has a plurality of first protrusions and a plurality of first recesses alternately arranged,
the second joint portion has a plurality of second protrusions and a plurality of second recesses alternately arranged,
the first recessed portion and the second recessed portion are formed on both sides of the first protrusion,
the third recessed portion and the fourth recessed portion are formed on both sides of the second protrusion,
the first engagement members are inserted into the first holes formed in the first protrusion and the second protrusion, respectively, which are adjacent to each other;
the second engagement members are inserted into the second holes formed in the first and second protrusions, respectively, adjacent to each other;
A joining structure characterized by: