Laminated material structure and laminated material joining method

Abstract

To provide a laminated material structure or the like in which a plurality of laminated materials are firmly joined in a mutually restrained state without using an adhesive.SOLUTION: In a laminated wood structure 10 constituted by joining a first laminated wood 20 and a second laminated wood 30, the first laminated wood has a first comb-like end part 24 constituted by alternately laminating a first wood 21 having a first projecting end part 21a projecting from a first reference surface P1 and a second wood 22 having a first non-projecting end part 22a coinciding with the first reference surface, the second laminated wood has a second comb-like end part 34 formed by alternately laminating a third wood 31 having a second projecting end part 31a projecting from a second reference surface P2 and a fourth wood piece 32 having a second non-projecting end part 32a coinciding with the second reference surface, and the first comb-like end part includes at least one first non-projecting end part and first projecting end parts on both sides thereof.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to laminate structures and methods for joining laminates. [Background technology]

[0002] A laminated material structure is known that is constructed by forming comb-shaped protrusions on the end of one laminated material and the end of the other laminated material, applying adhesive to these comb-shaped protrusions, and then fitting and joining the two together (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 61-274031 Summary of the Invention [Problem to be solved by the invention]

[0004] However, because most adhesives generally contain resin components dissolved in organic solvents, the organic solvents contained in the adhesive volatilize and are released into the air when the adhesive is applied to the surface of each piece of wood, and when the piece of wood is compressed and molded after the adhesive has been applied. Organic solvents released into the air in this way are often harmful to the human body, posing problems not only in terms of health and hygiene safety, but also during disposal and secondary use.

[0005] In view of the above-mentioned problems, the object of the present disclosure is to provide a laminated material structure in which multiple laminated materials are firmly joined together while being constrained to each other without using adhesive, and a method for joining laminated materials. [Means for solving the problem]

[0006] The laminated material structure according to the first aspect of the present disclosure comprises: A laminated material structure formed by joining a first laminated material and a second laminated material, The first laminated material has a first comb-shaped end portion formed by alternately laminating first wood pieces having a first protruding end portion protruding from a first reference plane and a second wood piece having a first non-protruding end portion coinciding with the first reference plane, The second laminated material has a second comb-shaped end portion formed by alternately laminating a third wood piece having a second protruding end portion protruding from the second reference plane and a fourth wood piece having a second non-protruding end portion coinciding with the second reference plane, the first comb-shaped end portion includes at least one of the first non-protruding end portion, the first protruding end portions on both sides of the first non-protruding end portion, and a groove portion between the first protruding end portions, the groove portion having the first non-protruding end portion as a bottom portion; the second comb-shaped end portion includes at least one second protruding end portion and two second non-protruding end portions on both sides thereof; by inserting the second protruding end portion into the groove portion until the second non-protruding end portion abuts against the first protruding end portion, a first overlapping portion is formed in which the first protruding end portion and the second protruding end portion are alternately overlapped; By inserting rod-shaped fasteners into the first overlapping portion, the second overlapping portion where the first wood and the second wood are alternately overlapped, and the third overlapping portion where the third wood and the fourth wood are alternately overlapped in the overlapping direction, the first laminated material and the second laminated material are joined in a restrained state.

[0007] In the above laminated material structure, The rod-shaped fastener may be inserted into the first overlapping portion at four locations in its thickness direction, into the second overlapping portion at two locations in its thickness direction, and into the third overlapping portion at two locations in its thickness direction. Further, in the above laminated material structure, The rod-shaped fastener may be a threaded wood screw or an unthreaded pin.

[0008] A laminated material joining method according to a second aspect of the present disclosure includes: A method for joining a first laminated material and a second laminated material, comprising: The first laminated material has a first comb-shaped end portion formed by alternately laminating wood pieces having a first protruding end portion protruding from a first reference plane and wood pieces having a first non-protruding end portion coinciding with the first reference plane, The second laminated material has a second comb-shaped end portion formed by alternately laminating wood pieces having second protruding end portions protruding from the second reference plane and wood pieces having second non-protruding end portions that coincide with the second reference plane, the first comb-shaped end portion includes at least one of the first non-protruding end portion, the first protruding end portions on both sides of the first non-protruding end portion, and a groove portion between the first protruding end portions, the groove portion having the first non-protruding end portion as a bottom portion; the second comb-shaped end portion includes at least one second protruding end portion and two second non-protruding end portions on both sides thereof; an overlapping portion forming step of inserting the second protruding end portion into the groove portion until the second non-protruding end portion abuts against the first protruding end portion to form a first overlapping portion in which the first protruding end portion and the second non-protruding end portion overlap each other; and a rod-shaped fastener insertion process for inserting rod-shaped fasteners into the first overlapping portion, the second overlapping portion where the first wooden piece and the second wooden piece are alternately overlapped, and the third overlapping portion where the third wooden piece and the fourth wooden piece are alternately overlapped in the overlapping direction, thereby joining the first laminated material and the second laminated material in a constrained state. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to provide a laminated material structure in which a plurality of laminated materials are firmly joined together while being constrained without using adhesive, and a method for joining laminated materials. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of an L-shaped laminated material structure 10. [Figure 2] 1 is an exploded perspective view of a first laminated material 20 and a second laminated material 30 that constitute an L-shaped laminated material structure 10. FIG. [Figure 3] FIG. 1 is a perspective view of a rectangular laminated material structure 10A. [Figure 4]2(a) and 2(b) are side views of a first piece of wood 21 and a fourth piece of wood 32 extracted from the laminated material structure 10 in FIG. [Figure 5] 2(a) and 2(b) are side views of a second piece of wood 22 and a third piece of wood 31 extracted from the laminated material structure 10 in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, specific embodiments to which the present disclosure is applied will be described in detail with reference to the drawings. In each drawing, the same elements are designated by the same reference numerals, and for clarity of explanation, duplicate explanations will be omitted as necessary.

[0012] The laminated material structure of this embodiment is constructed by joining multiple laminated materials. For example, an L-shaped laminated material structure (see FIG. 1) can be constructed by combining two laminated materials. Furthermore, a rectangular laminated material structure (see FIG. 3) can be constructed by combining four laminated materials. FIG. 1 is a perspective view of an L-shaped laminated material structure 10. FIG. 2 is an exploded perspective view of a first laminated material 20 and a second laminated material 30 that constitute the L-shaped laminated material structure 10. FIG. 3 is a perspective view of a rectangular laminated material structure 10A.

[0013] As an example, an example in which an L-shaped laminated material structure 10 is constructed by combining a first laminated material 20 and a second laminated material 30 will be described below.

[0014] As shown in FIG. 2, the first laminated material 20 has a plurality of through holes H in the stacking direction of the plurality of first wooden pieces 21 and second wooden pieces 22 stacked on top of each other. 20 and forming the plurality of through holes H 20 The first laminated material 20 is constructed by continuously joining the plurality of first wooden pieces 21 and second wooden pieces 22 by press-fitting wooden dowels 23 into the respective pieces. The number of first wooden pieces 21 and second wooden pieces 22 that make up the first laminated material 20 may be four or more. For convenience, the wooden dowels 23 are not shown in Figure 1.

[0015] The first laminated material 20 has a first comb-shaped end 24 formed by alternately stacking a first piece of wood 21 having a first protruding end 21a protruding from a first reference plane P1 (see Figure 2) and a second piece of wood 22 having a first non-protruding end 22a that coincides with the first reference plane P1.

[0016] The first comb-shaped end 24 includes at least one first non-protruding end 22a, first protruding end portions 21a on both sides thereof, and a groove 25 between the first protruding end portions 21a, with the first non-protruding end portion 22a as its bottom.

[0017] Similarly, as shown in FIG. 2, the second laminated material 30 has a plurality of through holes H in the stacking direction of the plurality of third wooden pieces 31 and fourth wooden pieces 32 stacked on each other. 30 and forming the plurality of through holes H 30 The second laminated material 30 is constructed by continuously joining the plurality of third wooden pieces 31 and fourth wooden pieces 32 by press-fitting wooden dowels 33 into the respective pieces. The number of third wooden pieces 31 and fourth wooden pieces 32 that make up the second laminated material 30 may be four or more. For convenience, the wooden dowels 33 are not shown in Figure 1.

[0018] The second laminated material 30 has a second comb-shaped end 34 formed by alternately stacking a third piece of wood 31 having a second protruding end 31a protruding from the second reference plane P2 (see Figure 2) and a fourth piece of wood 32 having a second non-protruding end 32a that coincides with the second reference plane P2.

[0019] The second comb-like end 34 includes at least one second protruding end 31a and second non-protruding ends 32a on both sides thereof.

[0020] Then, as shown in FIG. 1, by inserting the second protruding end 31a into the groove portion 25 until the second non-protruding end 32a abuts the first protruding end 21a, an overlapping portion 40 (an example of the first overlapping portion of the present disclosure) is formed in which the first protruding end 21a and the second protruding end 31a are alternately overlapped.

[0021] The overlapping portion 40, where the first protruding end portions 21a and the second protruding end portions 31a alternately overlap, is continuously joined by rod-shaped fasteners p1, p3, p5, and p7 inserted in the overlapping direction (see arrow Ar1 in FIG. 1). Meanwhile, the overlapping portion where the third wooden pieces 31 and the fourth wooden pieces 32 alternately overlap (an example of a third overlapping portion of the present disclosure) is continuously joined by rod-shaped fasteners p2 and p4 inserted in the overlapping direction (see arrow Ar1 in FIG. 1). Furthermore, the overlapping portion where the first wooden pieces 21 and the second wooden pieces 22 alternately overlap (an example of a second overlapping portion of the present disclosure) is continuously joined by rod-shaped fasteners p6 and p8 inserted in the overlapping direction (see arrow Ar1 in FIG. 1).

[0022] As described above, the first laminated material 20 and the second laminated material 30 are firmly joined together while being constrained by the rod-shaped fasteners p1 to p8. The rod-shaped fasteners p1 to p8 are, for example, wood screws having metal threads.

[0023] When the rod-shaped fasteners p1 to p8 are wood screws, the first laminated material 20 and the second laminated material 30 are firmly joined together in a constrained state by screwing the wood screws into the overlapping direction of each overlapping portion. Alternatively, the first laminated material 20 and the second laminated material 30 may be firmly joined together in a constrained state by drilling pilot holes (through holes) in the overlapping direction of each overlapping portion and threading wood screws into the pilot holes. The rod-shaped fasteners p1 to p8 are not limited to wood screws, but may also be metal pins without threads. When the rod-shaped fasteners p1 to p8 are pins, the first laminated material 20 and the second laminated material 30 are firmly joined together in a constrained state by drilling pilot holes (through holes) in the overlapping direction of each overlapping portion and pressing the pins into the through holes.

[0024] Next, the locations where the rod-shaped fasteners p1 to p8 are inserted will be specifically described.

[0025] 4(a) and 4(b) are side views of the first wooden piece 21 and the fourth wooden piece 32 extracted from the laminated material structure 10 in FIG.

[0026] In Figure 4(a) and Figure 4(b), the symbol AX 32represents the central axis of the fourth wood 32.

[0027] First, the positions where the rod-shaped fasteners p1 and p2 are inserted will be described.

[0028] As shown in Figure 4(a), when the first wood piece 21 and the fourth wood piece 32 are arranged with the second non-protruding end portion 32a abutting against the first protruding end portion 21a, if the fourth wood piece 32 attempts to rotate in the direction of arrow Ar2, the first wood piece 21 and the fourth wood piece 32 (the first protruding end portion 21a and the second non-protruding end portion 32a) abut against each other at the upper portion of their interface Pa (see hatched area A1 in Figure 4(a)), preventing further rotation. On the other hand, as shown in Figure 4(a), when the first wood piece 21 and the fourth wood piece 32 are arranged with the second non-protruding end portion 32a abutting against the first protruding end portion 21a, if the fourth wood piece 32 attempts to rotate in the direction of arrow Ar2, the first wood piece 21 and the fourth wood piece 32 attempt to move away from each other at the lower portion of their interface Pa (see arrow Ar3 in Figure 4(a)).

[0029] In order to prevent the first wooden piece 21 and the fourth wooden piece 32 from moving apart at the lower part of the boundary surface Pa between them and causing a gap between them, as shown in Figure 4(a), rod-shaped fasteners p1 and p2 are inserted on one side and the other side of the boundary surface Pa. In this way, the first laminated material 20 and the second laminated material 30 are joined in a restrained state.

[0030] Specifically, one rod-shaped fastener p1 is located on one side of the boundary surface Pa (the left side in FIG. 4(a) , i.e., the overlapping portion 40 where the first protruding end portion 21a and the second protruding end portion 31a are alternately overlapped) and on the central axis AX of the fourth wood 32. 32 On the other hand, the other rod-shaped fastener p2 is inserted in the overlapping direction to the lower part of the fourth piece 32. The other rod-shaped fastener p2 is inserted in the overlapping direction to the other side of the boundary surface Pa (the right side in FIG. 4(a) , i.e., the overlapping part where the third piece 31 and the fourth piece 32 are alternately overlapped) and in the overlapping direction to the center axis AX 32 It is inserted in the overlapping direction into the lower part.

[0031] By inserting the rod-shaped fasteners p1 and p2 as described above, the first laminated material 20 and the second laminated material 30 are joined in a mutually constrained state, so that the lower portions of the boundary surface Pa between the first wood 21 and the fourth wood 32 are prevented from moving away from each other (see arrow Ar3 in Figure 4(a)) and causing a gap between them.

[0032] Next, the locations where the rod-shaped fasteners p3 and p4 are inserted will be described.

[0033] As shown in Figure 4(b), when the first wood 21 and the fourth wood 32 are arranged with the second non-protruding end 32a abutting against the first protruding end 21a, if the fourth wood 32 attempts to rotate in the direction of arrow Ar4, the first wood 21 and the fourth wood 32 abut against each other at the lower part of their interface Pa (see hatched area A2 in Figure 4(b)), preventing further rotation. On the other hand, as shown in Figure 4(b), when the first wood 21 and the fourth wood 32 are arranged with the second non-protruding end 32a abutting against the first protruding end 21a, if the fourth wood 32 attempts to rotate in the direction of arrow Ar4, the first wood 21 and the fourth wood 32 attempt to move away from each other at the upper part of their interface Pa (see arrow Ar5 in Figure 4(b)).

[0034] In order to prevent the first wooden piece 21 and the fourth wooden piece 32 from moving apart at the upper part of the boundary surface Pa between them and causing a gap between them, as shown in Figure 4(b), rod-shaped fasteners p3 and p4 are inserted on one side and the other side of the boundary surface Pa. This joins the first laminated material 20 and the second laminated material 30 in a restrained state.

[0035] Specifically, one rod-shaped fastener p3 is located on one side of the boundary surface Pa (the left side in FIG. 4(b) , i.e., the overlapping portion 40 where the first protruding end portion 21a and the second protruding end portion 31a are alternately overlapped) and on the central axis AX of the fourth wood 32. 32On the other hand, the other rod-shaped fastener p4 is inserted in the overlapping direction to the upper part of the fourth piece 32. The other rod-shaped fastener p4 is inserted on the other side of the boundary surface Pa (the right side in FIG. 4(b) , i.e., the overlapping part where the third piece 31 and the fourth piece 32 are alternately overlapped) and on the central axis AX 32 It is inserted in the upper part in the overlapping direction.

[0036] The rod-shaped fasteners p3 and p4 inserted as described above join the first laminated material 20 and the second laminated material 30 in a mutually constrained state, thereby preventing the first wood 21 and the fourth wood 32 from moving apart from each other at the upper part of the boundary surface Pa (see arrow Ar5 in Figure 4(b)) and causing a gap between them.

[0037] 5(a) and 5(b) are side views of the second wooden piece 22 and the third wooden piece 31 extracted from the laminated material structure 10 in FIG.

[0038] In Fig. 5(a) and Fig. 5(b), the symbol AX 22 represents the central axis of the second wood 22.

[0039] Next, the locations where the rod-shaped fasteners p5 and p6 are inserted will be described.

[0040] As shown in Figure 5(a), when the second wood 22 and the third wood 31 are arranged with the first non-protruding end 22a abutting against the second protruding end 31a, if the third wood 31 attempts to rotate in the direction of arrow Ar6, the second wood 22 and the third wood 31 (the first non-protruding end 22a and the second protruding end 31a) abut against each other at the inner portion of the interface Pb (see hatched area A3 in Figure 5(a)) between the two pieces, preventing further rotation. On the other hand, when the second wood 22 and the third wood 31 are arranged with the first non-protruding end 22a abutting against the second protruding end 31a as shown in Figure 5(a), if the third wood 31 attempts to rotate in the direction of arrow Ar6, the second wood 22 and the third wood 31 attempt to move away from each other at the outer portion of the interface Pb between the second wood 22 and the third wood 31 (see arrow Ar7 in Figure 5(a)).

[0041] In order to prevent the second wooden piece 22 and the third wooden piece 31 from moving apart at the outer portions of the boundary surface Pb between them and causing a gap between them, rod-shaped fasteners p5 and p6 are inserted on one side and the other side of the boundary surface Pb, respectively, as shown in Figure 5(a). This allows the first laminated material 20 and the second laminated material 30 to be joined in a restrained state.

[0042] Specifically, one rod-shaped fastener p5 is located on one side of the boundary surface Pb (the lower side in FIG. 5(a) , i.e., the overlapping portion 40 where the first protruding end portion 21a and the second protruding end portion 31a are alternately overlapped) and on the central axis AX of the second wood 22. 22 On the other hand, the other rod-shaped fastener p6 is inserted in the overlapping direction to the outer part of the first piece 21. On the other hand, the other rod-shaped fastener p6 is inserted in the overlapping direction to the other side of the boundary surface Pb (the upper side in FIG. 5(a) , i.e., the overlapping part where the first piece 21 and the second piece 22 are alternately overlapped) and in the direction of the central axis AX of the second piece 22. 22 It is inserted in the overlapping direction in the outer part.

[0043] The rod-shaped fasteners p5 and p6 inserted as described above join the first laminated material 20 and the second laminated material 30 in a mutually constrained state, thereby preventing the second wood 22 and the third wood 31 from moving away from each other at the outer parts of the boundary surface Pb between them (see arrow Ar7 in Figure 5(a)) and causing a gap between them.

[0044] Next, the locations where the rod-shaped fasteners p7 and p8 are inserted will be described.

[0045] As shown in Figure 5(b), when the second wood 22 and the third wood 31 are arranged with the first non-protruding end 22a abutting against the second protruding end 31a, if the third wood 31 attempts to rotate in the direction of arrow Ar8, the second wood 22 and the third wood 31 abut against each other at the outer portion of their interface Pb (see hatched area A4 in Figure 5(b)), preventing further rotation. On the other hand, as shown in Figure 5(b), when the second wood 22 and the third wood 31 are arranged with the first non-protruding end 22a abutting against the second protruding end 31a, if the third wood 31 attempts to rotate in the direction of arrow Ar8, the second wood 22 and the third wood 31 attempt to move away from each other at the inner portion of their interface Pb (see arrow Ar9 in Figure 5(b)).

[0046] In order to prevent the second wooden piece 22 and the third wooden piece 31 from moving apart at the inner portion of the boundary surface Pb between them and causing a gap between them, rod-shaped fasteners p7 and p8 are inserted on one side and the other side of the boundary surface Pb, respectively, as shown in Figure 5(b). This joins the first laminated material 20 and the second laminated material 30 in a restrained state.

[0047] Specifically, one rod-shaped fastener p7 is located on one side of the boundary surface Pb (the lower side in FIG. 5(b) , i.e., the overlapping portion 40 where the first protruding end portion 21a and the second protruding end portion 31a are alternately overlapped) and on the central axis AX of the second wood 22. 22 On the other hand, the other rod-shaped fastener p8 is inserted in the overlapping direction to the inner part of the first piece 21. On the other hand, the other rod-shaped fastener p8 is inserted in the overlapping direction to the other side of the boundary surface Pb (the upper side in FIG. 5(b) , i.e., the overlapping part where the first piece 21 and the second piece 22 are alternately overlapped) and in the direction of the central axis AX of the second piece 22. 22 It is inserted in the direction of overlap into the inner part.

[0048] The rod-shaped fasteners p7 and p8 inserted as described above join the first laminated material 20 and the second laminated material 30 in a mutually constrained state, thereby preventing the second wood 22 and the third wood 31 from moving away from each other at the inner part of the boundary surface Pb between them (see arrow Ar9 in Figure 5(b)) and causing a gap between them.

[0049] As described above, according to this embodiment, it is possible to provide a laminated material structure and a laminated material joining method in which multiple laminated materials 20, 30 are firmly joined together while being constrained to each other using rod-shaped fasteners p1 to p8 without using adhesive.

[0050] The present disclosure is not limited to the above-described embodiments, and may be modified as appropriate without departing from the spirit and scope of the present disclosure. In addition, the present disclosure may be implemented by appropriately combining the respective embodiments.

[0051] For example, as shown in Figure 3, a rectangular laminated material structure 10A may be constructed by combining four laminated materials. In Figure 3, each hatched black circle represents rod-shaped fasteners p1 to p8. In Figure 3, rod-shaped fasteners p1 to p8 are inserted into the four corners of the rectangular laminated material structure 10A. [Explanation of symbols]

[0052] 10, 10A...Laminated material structure 20...First laminate 21…1st wood 21a...first protruding end 22…Second wood 22a...first non-protruding end 23...Wooden dowel 24...First comb-shaped end 25...Groove 30...Second laminate 31…Third wood 31a...Second protruding end 32…4th wood 32a...Second non-protruding end 33...Wooden dowel 34…Second comb-shaped end AX 22 , AX 32 ...center axis H 20 , H 30 ...Through holes P1…1st reference plane P2…Second reference plane Pa, Pb… boundary surface p1-p8…Rod-shaped binding tool

Claims

1. A laminated material structure formed by joining a first laminated material and a second laminated material, The first laminated material has a first comb-shaped end portion formed by alternately laminating first wood pieces having a first protruding end portion protruding from a first reference plane and a second wood piece having a first non-protruding end portion coinciding with the first reference plane, The second laminated material has a second comb-shaped end portion formed by alternately laminating a third wood piece having a second protruding end portion protruding from the second reference plane and a fourth wood piece having a second non-protruding end portion coinciding with the second reference plane, the first comb-shaped end portion includes at least one first non-protruding end portion, the first protruding end portions on both sides of the first non-protruding end portion, and a groove portion between the first protruding end portions, the groove portion having the first non-protruding end portion as a bottom portion; the second comb-shaped end portion includes at least one second protruding end portion and second non-protruding end portions on both sides thereof; the second protruding end portion is inserted into the groove portion until the second non-protruding end portion abuts against the first protruding end portion, thereby forming a first overlapping portion in which the first protruding end portion and the second protruding end portion are alternately overlapped; A laminated material structure in which the first laminated material and the second laminated material are joined in a constrained state by inserting rod-shaped fasteners into the first overlapping portion, the second overlapping portion where the first wood and the second wood are alternately overlapped, and the third overlapping portion where the third wood and the fourth wood are alternately overlapped in the overlapping direction.

2. The rod-shaped fastener is inserted in two locations in the thickness direction on one side of the boundary surface between the first protruding end and the second non-protruding end, and in two locations in the thickness direction on the other side of the boundary surface between the first protruding end and the second non-protruding end, and is inserted in two locations in the thickness direction on one side of the boundary surface between the first non-protruding end and the second protruding end, and in two locations in the thickness direction on the other side of the boundary surface between the first non-protruding end and the second protruding end, a laminated material structure as described in claim 1.

3. 2. The laminated material structure according to claim 1, wherein the rod-shaped fastener is a wood screw having a threaded portion or a pin having no threaded portion.

4. A method for joining a first laminated material and a second laminated material, comprising: The first laminated material has a first comb-shaped end portion formed by alternately laminating wood pieces having a first protruding end portion protruding from a first reference plane and wood pieces having a first non-protruding end portion coinciding with the first reference plane, The second laminated material has a second comb-shaped end portion formed by alternately laminating wood pieces having second protruding end portions protruding from the second reference plane and wood pieces having second non-protruding end portions that coincide with the second reference plane, the first comb-shaped end portion includes at least one first non-protruding end portion, the first protruding end portions on both sides of the first non-protruding end portion, and a groove portion between the first protruding end portions, the groove portion having the first non-protruding end portion as a bottom portion; the second comb-shaped end portion includes at least one second protruding end portion and second non-protruding end portions on both sides thereof; an overlapping portion forming step of inserting the second protruding end portion into the groove portion until the second non-protruding end portion abuts against the first protruding end portion to form a first overlapping portion in which the first protruding end portion and the second non-protruding end portion overlap each other; and a rod-shaped fastener insertion step for inserting rod-shaped fasteners into the first overlapping portion, the second overlapping portion where the first wooden piece and the second wooden piece are alternately overlapped, and the third overlapping portion where the third wooden piece and the fourth wooden piece are alternately overlapped in the overlapping direction, thereby joining the first laminated material and the second laminated material in a mutually constrained state.

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