JP2022175710A - Building material joining structure - Google Patents

Abstract

To provide a building material joining structure that can join multiple building materials by reducing welding, screwing, etc.SOLUTION: A building material joining structure 1 has a first building material 2, a second building material 3, and a joining member 4 for joining the second building material 3 to the first building material 2. The first building material 2 has a first through hole 22a, and the second building material 3 has an insertion portion 322 that can be inserted into the first through hole 22a. The insertion portion 322 is provided with a first notch 322a into which the joining member 4 can be fitted. The joining member 4 is attached to the first building material 2 so as to be movable between a joining position X1 where the second building material 3 can be joined to the first building material 2 by fitting into the first through hole 22a with the insertion portion 322 inserted into the first notch 322a, and a retraction position where an interference between the insertion portion 322 and the joining member 4 can be avoided when inserting the insertion portion 322 into the first through hole 22a.SELECTED DRAWING: Figure 1

Description

There is an application for exception to loss of novelty

The present invention relates to a building material joining structure.

Patent Literature 1 discloses a door frame manufactured by welding and joining a plurality of building materials. By the way, from the viewpoint of prevention of global warming, the reduction of carbon dioxide emission is promoted, and reduction of welding joints that emit welding gas containing carbon dioxide is desired.

Patent Literature 2 discloses a fitting frame assembled by joining a plurality of building materials with screws as means for reducing welding joints. However, when a plurality of building materials are joined with screws, there is a problem that a large number of screws are required, requiring a lot of man-hours.

JP 2020-073781 A JP 2015-004232 A

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a building material joining structure capable of joining a plurality of building materials by reducing welding, screwing, and the like.

The building material joining structure includes a first building material, a second building material, and a joining member for joining the second building material to the first building material, the first building material having a through hole, and the second building material having a through hole. The building material includes an insertion portion that can be inserted through the through hole, the insertion portion includes a first notch portion that can be fitted with the joint member, and the joint member has the insertion portion inserted through the through hole. a joining position where the second building material can be joined to the first building material by fitting into the first notch in a state in which the insertion portion and the joining member are inserted when the insertion portion is inserted into the through hole; is movably attached to the first building material to a retracted position capable of avoiding interference with the

According to such a configuration, by inserting the insertion portion into the through hole and fitting the joining member into the first notch, the first building material and the second building material can be joined without welding or screwing. can.

FIG. 1 is a perspective view of a building material joining structure according to one embodiment. FIG. 2 is a left side view of the building material joining structure according to the embodiment. FIG. 3 is a plan view of the building material joining structure according to the embodiment. FIG. 4 is a plan view showing a state before joining of the building material joining structure according to the embodiment. FIG. 5 is a front view showing a state before joining of the building material joining structure according to the embodiment. FIG. 6 is an enlarged sectional view taken along line VI-VI of FIG. FIG. 7 is an enlarged view of essential parts of the fitting portion and the first notch portion in FIG. 3 . FIG. 8 is an enlarged view of a main portion of the first projecting portion and the second cutout portion of FIG. 3; FIG. 9 is a left side view of a building material joining structure according to another embodiment. FIG. 10 is a plan view of the building material joining structure according to the same embodiment. FIG. 11 is an enlarged view of essential parts of the fitting portion and the first notch portion of FIG. 10 ;

A construction material joining structure according to the present embodiment will be described below with reference to FIGS. 1 to 8. FIG. In addition, in each figure (as well as in FIGS. 9 to 11), the dimensional ratio of the drawings and the actual dimensional ratios do not necessarily match, and the dimensional ratios between the drawings do not necessarily match. do not have.

As shown in FIG. 1, the building material joining structure 1 according to the present embodiment includes a first building material (also referred to as vertical material) 2, a second building material (also referred to as horizontal material) 3, and a second building material 3 as the first building material. a joining member 4 for joining to 2; The building material joining structure 1 is, for example, a door frame or window composed of a pair of first building materials 2 spaced apart and a pair of second building materials 3 joined to their upper and lower ends. It can be used for rectangular frames such as frames. Note that the building material joining structure 1 may be used, for example, as a frame of a building.

In this embodiment, the first building material 2 is a vertical member installed in the vertical direction (vertical direction), and the second building material 3 is a horizontal member installed in the horizontal direction (horizontal direction). . The building material joining structure 1 may be, for example, a structure in which the first building material 2 is a horizontal member and the second building material 3 is a vertical member.

The building material joining structure 1 according to this embodiment is a structure in which the upper end portion of the first building material 2 and the left end portion of the second building material 3 are joined at right angles. However, it is not limited to such a structure, and the building material joining structure 1 may be, for example, a structure in which the central portion of the first building material 2 and the left end portion of the second building material 3 are joined at right angles. On the other hand, the structure which joined the 2nd building material 3 diagonally may be sufficient.

As an explanation of the building material joining structure 1 according to this embodiment, the upper end portion of the first building material 2 and the left end portion of the second building material 3 will be explained. Other parts of the first building material 2 and the second building material 3 may also have the same configuration as the upper end portion of the first building material 2 and the left end portion of the second building material 3 . Moreover, although the direction is shown when explaining the building material joining structure 1 which concerns on this embodiment, the building material joining structure 1 is not limited to the direction.

In the present embodiment, the first building material 2 has a long shape along its extending direction (vertical direction) and is bent in a convex shape, but it is not limited to this. The second building material 3 has a long shape along its extending direction (horizontal direction) and is bent into a convex shape, but is not limited to this.

In this embodiment, a pair of first building materials 2 (only one is shown) are arranged so as to sandwich the second building material 3 (so-called longitudinal width), and the width of the first building material 2 in the front-rear direction is the width of the second building material 3. An example in which the width is larger than the width in the front-rear direction (so-called surface omission) is shown. Therefore, it is preferable that the joining member 4 is attached to the first building material 2 . In addition, for example, a pair of second building materials 3 may be arranged so as to sandwich the first building materials 2 (so-called sideways), and the width of the first building materials 2 in the front-rear direction is the width of the second building materials 3 in the front-rear direction. may be the same as (so-called flush).

As shown in FIGS. 2 to 5, the first building material 2 includes a first groove portion 21 formed in a groove shape and extending along the longitudinal direction of the first building material 2, and a groove edge (left end portion) of the first groove portion 21. A pair of first flat portions 22, 22 extending in the front-rear direction are provided. The first building material 2 may, for example, have a configuration in which the first groove portion 21 is not provided, and may have a configuration in which the first flat portion 22 is provided only on one side of the first groove portion 21 in the front-rear direction. may

The first building material 2 has a first through hole 22a for joining the second building material 3 . The first through hole 22 a penetrates (the first flat portion 22 of) the first building material 2 along the longitudinal direction of the second building material 3 . In the present embodiment, the first through hole 22a is formed in a rectangular shape (long hole) whose longitudinal direction is the front-rear direction (direction perpendicular to both the longitudinal direction of the first building material and the longitudinal direction of the second building material). there is By forming the first through hole 22a as an elongated hole extending in the front-rear direction, it is possible to increase the joining strength of the building material joining structure 1 in the front-rear direction when an insertion portion 322, which will be described later, is inserted into the first through-hole 22a and joined. can. As a result, for example, when the building material joining structure 1 is used for a door frame, it is possible to prevent the building material joining structure 1 from being destroyed by an external force in the front-rear direction due to opening and closing of the door. Note that the first through hole 22a may be, for example, a round hole.

In the present embodiment, the first through holes 22a are provided in each of the pair of first flat portions 22, 22, but are provided in only one of the pair of first flat portions 22, 22. It may be a configuration.

In this embodiment, the first groove portion 21 is formed to have a substantially U-shaped cross section, but the shape is not limited thereto. As shown in FIG. 6, the first groove portion 21 includes a second through hole 21a for movably attaching the joining member 4 to the first building material 2, and a second through hole 21a for suppressing the joining member 4 from deviating from a joining position X1 described later. and a fitting hole 21b. In this embodiment, the fitting hole 21b is a through hole, but may be, for example, a recess.

As shown in FIGS. 3 to 5, the second building material 3 includes a second groove portion 31 formed in a groove shape and extending along the longitudinal direction of the second building material 3, and a groove edge (upper portion) of the second groove portion 31. and a pair of second flat portions 32 , 32 extending in the direction. The second building material 3 may have, for example, a configuration in which the second groove portion 31 is not provided, and a configuration in which the second flat portion 32 is provided only on one side of the second groove portion 31 in the front-rear direction. may In this embodiment, the second groove portion 31 is formed to have a substantially U-shaped cross section, but is not limited to such a shape.

The second flat portion 32 includes a second flat portion main body 321 and an insertion portion 322 that can be inserted through the first through hole 22a. The insertion portion 322 is arranged to protrude from the second flat portion main body 321 in the longitudinal direction of the second building material 3 (leftward in the illustrated example). In this embodiment, the insertion portion 322 is formed in a substantially rectangular shape in a plan view, but is not limited to such a shape. Further, in the present embodiment, the insertion portion 322 is provided on each of the pair of second flat portions 32, 32, but is provided on only one of the pair of second flat portions 32, 32. It may be a configuration. In addition, for example, a configuration in which the second groove portion 31 includes the insertion portion 322 may be employed.

As shown in FIGS. 3, 4 and 7, the insertion portion 322 has a first notch portion 322a into which the joining member 4 can be fitted. In the present embodiment, the first cutout portion 322a is a rectangular cutout extending in the front-rear direction from the end portion of the insertion portion 322 on the side of the second groove portion 31, but is not limited to this. In the present embodiment, the first notch portion 322a is arranged at the right end portion of the insertion portion 322, but it is not limited to this.

When the insertion portion 322 is inserted into the first through hole 22a and the first flat portion 22 and the second flat portion main body 321 are in contact with each other, the width W1 of the first cutout portion 322a (the left end of the first cutout portion 322a and the first cutout portion 322a When the gap G1 with the left end of the flat portion 22 is smaller than the width W1, the gap G1 (see FIG. 11) is slightly larger than the thickness T3 of the joining member 4 (for example, 0.2 to 0.5 mm larger). ) is preferably designed to be In the design value, when the width W1 (gap G1) is close to the thickness T3, the joint member 4 may not fit in the first notch 322a due to variations in the thickness, processing, and assembly of the first building material 2, the second building material 3, and the joint member 4. This is because it may not fit.

As shown in FIGS. 2 to 5, the joining member 4 includes an attachment portion 41 for movably attaching the joining member 4 to the first building material 2, and a fitting portion 42 that can be fitted into the first notch portion 322a. And prepare. A pair of fitting portions 42 are provided corresponding to the first notch portion 322a. In this embodiment, the joint member 4 is formed to have a substantially hat-shaped cross section, but is not limited to such a shape.

The joint member 4 is fitted in the first cutout portion 322a and joined to the insertion portion 322 when the insertion portion 322 is inserted into the first through hole 22a at the joint position X1 where the second building material 3 can be joined to the first building material 2. It is attached to the first building material 2 so as to be able to move to a retracted position X2 capable of avoiding interference with the member 4. - 特許庁By fitting the joint member 4 into the first notch portion 322a in a state where the insertion portion 322 is inserted through the through hole 22a, the insertion portion 322 is prevented from slipping out of the through hole 22a, thereby preventing the second building material 3 from being removed from the first notch portion 322a. It is joined to the building material 2 . In the present embodiment, the joining member 4 is attached to the first building material 2 so as to be slidable in the vertical direction, but it is not limited to this.

As shown in FIG. 6, the attachment portion 41 includes an attachment hole 41a for movably attaching to the first building material 2, and a projection 41b for suppressing the joint member 4 from deviating from the joint position X1. . In this embodiment, the attachment hole 41a is a long hole extending in the longitudinal direction of the first building material 2 . By making the attachment hole 41a an elongated hole, the joining member 4 can be slidably attached to the first building material 2 by the attachment means 5. As shown in FIG. “Movably attached” means that the joining member 4 and the first building material 2 are integrated by the attaching means 5 and the joining member 4 is relatively movable with respect to the first building material 2 by its own weight or external force. Note that the mounting hole 41a may be, for example, a round hole.

In the present embodiment, the mounting portion 41 is mounted to the first building material 2 by the mounting means 5 by allowing the mounting hole 41a and the second through hole 21a to communicate with each other. In this embodiment, the mounting means 5 are rivets, but may be, for example, a combination of a screw and nut or a pin and E-ring. Although the building material joining structure 1 can reduce the screwing for joining the second building material 3 to the first building material 2, it does not prevent the application of such screw members.

The protrusion 41b is arranged to protrude toward the first building material 2 (rightward). In the present embodiment, the protrusion 41b is a columnar dowel, but is not limited to this. In the present embodiment, the projection 41b is arranged at a position where it fits into the fitting hole 21b at the joining position X1, but the present invention is not limited to this.

As shown in FIGS. 2 to 5, the first building material 2 includes a pair of first standing portions 23, 23 standing leftward from the end portion of the first flat portion 22 opposite to the first groove portion 21 in the front-rear direction. , a pair of first roof portions 24 , 24 extending from the rear end portion of the first upright portion 23 toward the first groove portion 21 in the front-rear direction, and a reinforcing member 25 for reinforcing the first building material 2 . According to such a configuration, the strength of the first building material 2 can be enhanced. In addition, the first building material 2 may be configured without the first standing portion 23, the first roof portion 24 and/or the reinforcing member 25, for example. A configuration in which the portion 24 is provided only on one side in the front-rear direction may be employed.

The reinforcing member 25 is arranged along the front-rear direction and fixed (for example, screwed) to the pair of first roof portions 24 , 24 . In this embodiment, the reinforcing member 25 is formed to have a substantially L-shaped cross section, but is not limited to such a shape. The reinforcing member 25 may be arranged at a plurality of locations in the vertical direction (longitudinal direction of the first building material 2).

The second building material 3 includes a pair of second standing portions 33, 33 standing upward from the end portion of the second flat portion 32 opposite to the second groove portion 31 in the front-rear direction, and an upper end portion of the second standing portion 33. and a pair of second roof portions 34, 34 extending from the front-rear direction toward the second groove portion 31 side. According to such a configuration, the strength of the second building material 3 can be enhanced. In addition, the second building material 3 may have, for example, a configuration in which the second standing portion 33 and/or the second roof portion 34 are not provided, and the first standing portion 23 and/or the first roof portion 24 are not provided. It may be configured such that it is provided only on one side in the front-rear direction.

The first building material 2 has a first protrusion 26 that protrudes upward from the upper end of the first building material 2 . The first projecting portion 26 is configured by projecting (part of) the first flat portion 22 , the first standing portion 23 and the first roof portion 24 , but is not limited thereto. A part of at least one of the first upright portion 23 and the first roof portion 24 may be configured to protrude upward. In the present embodiment, the first projecting portion 26 has a substantially U-shaped cross section that projects upward from the end of the first flat portion 22 on the side of the first standing portion 23 in the front-rear direction to the first roof portion 24 . Although formed, it is not limited to such a shape. The strength of the first projecting portion 26 can be increased by making the first projecting portion 26 substantially U-shaped in cross section.

In the present embodiment, the first protrusions 26 are arranged on both end sides of the first building material 2 in the front-rear direction. For example, the first building material 2 may be configured not to include the first projecting portion 26, or may be configured to include the first projecting portion 26 only on one side in the front-rear direction. From the viewpoint of preventing injury to workers, the first projecting portion 26 is preferably flush with the second projecting portion 35 described later in the vertical direction.

The second building material 3 comprises a second protrusion 35 having a second notch 35a with which the first protrusion 26 can be engaged. In the present embodiment, the second projecting portion 35 is arranged to project from the second roof portion 34 in the longitudinal direction (leftward direction) of the second building material 3 and is formed in a substantially rectangular shape, but is not limited to this. By engaging the first projecting portion 26 in the longitudinal direction of the second building material 3 , the joint strength in the longitudinal direction of the second building material 3 can be increased in the building material joining structure 1 .

In this embodiment, the second protrusions 35 are arranged on both sides of the second building material 3 in the front-rear direction. For example, the second building material 3 may be configured not to include the second projecting portion 35, or may be configured to include the second projecting portion 35 only on one side in the front-rear direction.

As shown in FIG. 8 , (the second projecting portion 35 of) the second building material 3 has a second notch portion 35 a that can be fitted to the first projecting portion 26 . In the present embodiment, the second notch 35a is a rectangular notch extending in the front-rear direction from the end of the second projecting portion 35 on the side of the second standing portion 33, but is not limited to this. In the present embodiment, the second cutout portion 35a is arranged at the right end portion of the second protruding portion 35, but the present invention is not limited to this.

As shown in FIGS. 3 and 4 , the second building material 3 has a positioning portion 36 for positioning when joining with the first building material 2 . In this embodiment, the positioning portion 36 is arranged at the left end portion of the second building material 3 and has a shape cut slightly larger than the first groove portion 21 (for example, 0.5 mm or less).

By providing the positioning portion 36 in the second building material 3 , the second building material 3 can be joined to the first building material 2 by fitting the first groove portion 21 in the positioning portion 36 . As a result, for example, it is possible to suppress the movement of the second building material 3 in the front-rear direction before joining, making it easier to join the second building material 3 to the first building material 2 .

In the present embodiment, the first building material 2, the second building material 3, and the joining member 4 are formed by bending a single plate (for example, a metal plate), but the invention is not limited to this. The materials of the first building material 2, the second building material 3, and the joint member 4 may be the same or different.

A procedure for joining the first building material 2 and the second building material 3 in the building material joining structure 1 according to this embodiment will be described.

As shown in FIGS. 4 and 5, first, the joining member 4 is attached to the first building material 2 by the attachment means 5 so as to be movable. Next, after inserting the insertion portion 322 into the first through hole 22 a , the second notch portion 35 a is engaged with the first projecting portion 26 . Note that the insertion portion 322 may be inserted into the first through hole 22a after the second notch portion 35a is engaged with the first projecting portion 26 . Next, as shown in FIG. 2, a tool (not shown) is used to move the joint member 4 from the retracted position X2 to the joint position X1, and the joint member 4 is fitted into the first notch 322a. As a result, the second building material 3 can be joined to the first building material 2 without welding, screwing, or the like. As a tool for moving the joining member 4, for example, a small resin hammer can be used.

As described above, the building material joining structure 1 according to the present embodiment includes the first building material 2, the second building material 3, and the joining member 4 for joining the second building material 3 to the first building material 2. The building material 2 has a first through-hole 22a, the second building material 3 has an insertion portion 322 that can be inserted into the first through-hole 22a, and the insertion portion 322 is a first notch into which the joining member 4 can be fitted. The joining member 4 has a joining position X1 where the second building material 3 can be joined to the first building material 2 by fitting into the first through hole 22a with the insertion part 322 inserted into the first notch 322a. and a retracted position X2 at which interference between the insertion portion 322 and the joint member 4 can be avoided when the insertion portion 322 is inserted into the first through hole 22a. configuration is preferred.

According to such a configuration, the first building material 2 and the second building material 3 can be welded or screwed together by inserting the insertion portion 322 into the first through hole 22a and fitting the joining member 4 into the first notch portion 322a. can be reduced and joined. Further, for example, since the first building material 2 and the second building material 3 can be easily joined at the construction site, the first building material 2 and the second building material 3 can be transported to the construction site in a state where they are not joined. , and the loading efficiency and transportation efficiency of the first building material 2 and the second building material 3 can be increased. Furthermore, by moving the joint member 4 from the joint position X1 to the retracted position X2, the joint between the first building material 2 and the second building material 3 can be easily released.

In addition, in the present embodiment, the joining member 4 includes a protrusion 41b that protrudes toward the first building material 2 (to the right), and the first building material 2 has a fitting that allows the protrusion 41b to be fitted at the joining position X1. A configuration in which the hole 21b is provided is preferable.

According to such a configuration, by fitting the protrusion 41b into the fitting hole 21b at the joining position X1, it is possible to suppress the joining member 4 from being displaced from the joining position X1. As a result, after the second building material 3 is joined to the first building material 2, it is possible to prevent the joining member 4 from deviating from the joining position X1 and coming off the first notch 322a.

Further, in the present embodiment, the first building material 2 has a first groove portion 21 extending along the longitudinal direction of the first building material 2, and the joining member 4 is attached so as to be slidable along the first groove portion 21. It is preferable that there is

With such a configuration, the joint member 4 can be slid along the first groove portion 21 . This facilitates the operation of moving the joint member 4, and facilitates the fitting of the joint member 4 into the first notch 322a. That is, it becomes easy to join the second building material 3 to the first building material 2 .

In addition, in the building material joining structure 1 according to the present embodiment, the end (upper end) of the first building material 2 and the end (left end) of the second building material 3 are joined, and the first building material 2 is connected to the first building material 2, and the second building material 3 is preferably provided with a second notch 35a capable of engaging the first protrusion 26. .

According to such a configuration, the bonding strength between the first building material 2 and the second building material 3 can be increased by engaging the first projecting portion 26 with the second notch portion 35a. Further, by engaging the first projecting portion 26 with the second notch portion 35a and inserting the insertion portion 322 into the first through hole 22a, the first building material 2 and the second building material 3 are made relatively difficult to move. be able to. This makes it easier to fit the joining member 4 into the first notch portion 322 a and join the second building material 3 to the first member 2 .

In addition, the building material joining structure 1 is not limited to the configuration of the above-described embodiment, and is not limited to the above-described effects. Further, it goes without saying that the building material joining structure 1 can be modified in various ways without departing from the gist of the present invention. For example, it is of course possible to arbitrarily select one or a plurality of configurations, methods, etc., according to various modified examples described below and employ them in the configurations, methods, etc., according to the above-described embodiment.

(1) In the above-described embodiment, the first building material 2 is provided with the first groove portion 21, and the second through hole 21a and the fitting hole 21b are arranged in the first groove portion 21. However, the first building material 2 is not limited to such a configuration. For example, as shown in FIG. 9, the first building material 2 does not have the first groove portion 21, and the second through hole 21a and the fitting hole 21b are arranged in the first flat portion 22. may

(2) In the above-described embodiment, the insertion portion 322 is configured to have the first notch portion 322a only on one side in the front-rear direction (the first groove portion 21 side). However, the insertion portion 322 is not limited to such a configuration. For example, as shown in FIGS. 9 to 11, the insertion portion 322 may be configured to have first notches 322a on both sides in the front-rear direction. For example, the first notch 322a may be arranged only on the first standing portion 23 side (front side).

(3) In the above-described embodiment, the joint member 4 is formed to have a substantially hat-shaped cross section, and the fitting portions 42 are arranged on both sides in the front-rear direction. However, the joint member 4 is not limited to such a configuration. For example, as shown in FIGS. 9 and 10, the joint member 4 may be flat, and the fitting portion 42 may be arranged only on one side (front side) in the front-rear direction. Such fitting portion 42 is formed in a substantially U shape, but is not limited to such a shape.

(4) In the above-described embodiment, the joint member 4 is attached to the first building material 2 so as to be vertically slidable. However, the joint member 4 is not limited to such a configuration. For example, as shown in FIG. 9, the joining member 4 may be rotatably attached to the first building material 2 .

(5) The fitting portion 42 may be configured such that the end portion on the side to be fitted into the first notch portion 322a is chamfered or the like. According to such a configuration, it becomes easy to fit the fitting portion 42 into the first notch portion 322a.

(6) The protrusion 41b may be configured to protrude outside the first building material 2 (first groove portion 21) at the retracted position X2. According to such a configuration, the projection 41b can be engaged with the end of the first building material 2 (first groove portion 21) at the retracted position X2. Thereby, for example, when the first building material 2 is transported, it is possible to prevent the joining member 4 from being displaced from the retracted position X2.

1: building material joining structure, 2: first building material, 21: first groove, 21a: second through hole, 21b: fitting hole, 22: first flat portion, 22a: first through hole, 23: first upright Part 24: First roof part 25: Reinforcement member 26: First projecting part 3: Second building material 31: Second groove part 32: Second flat part 321: Second flat part main body 322: Insertion portion 322a: First notch portion 33: Second upright portion 34: Second roof portion 35: Second projecting portion 35a: Second notch portion 36: Positioning portion 4: Joining member 41: Mounting portion 41a: Mounting hole 41b: Protrusion 42: Fitting portion 5: Mounting means X1: Joining position X2: Retracted position

Claims (4)

a first building material, a second building material, and a joining member for joining the second building material to the first building material;
The first building material has a through hole,
The second building material includes an insertion portion that can be inserted into the through hole,
The insertion portion includes a first notch portion into which the joint member can be fitted,
The joining member has a joining position where the second building material can be joined to the first building material by being fitted in the first notch with the insertion portion inserted into the through hole, and a joining position where the insertion portion passes through the first building material. A building material joining structure attached to the first building material so as to be movable to a retracted position capable of avoiding interference between the insertion portion and the joining member when the joining member is inserted into the hole. The joining member has a protrusion that protrudes toward the first building material,
2. The building material joining structure according to claim 1, wherein said first building material has a fitting hole into which said protrusion can be fitted at said joining position. The first building material has a groove extending along the longitudinal direction of the first building material,
3. The building material joining structure according to claim 1, wherein said joining member is attached so as to be slidable along said groove. The end of the first building material and the end of the second building material are joined,
The first building material has a first protrusion projecting from an end of the first building material,
The building material joining structure according to any one of claims 1 to 3, wherein said second building material has a second notch portion capable of engaging said first projecting portion.

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