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] This disclosure relates to laminated material structures and laminated material joining methods. [Background technology]

[0002] A laminated material structure is known in which comb-like protrusions are formed on the end of one laminated material and the end of the other laminated material, and after applying adhesive to these comb-like protrusions, the two pieces are fitted together and joined (see, for example, Patent Document 1). [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 61-274031 [Overview of the project] [Problems that the invention aims to solve]

[0004] However, since most adhesives generally contain resin components dissolved in organic solvents, when applying the adhesive to the surface of each piece of wood, and when compressing and molding the wood after application, the organic solvent contained in the adhesive volatilizes and is released into the air. These organic solvents released into the air are often harmful to the human body, posing not only health and hygiene safety concerns, but also problems during disposal and secondary use.

[0005] The purpose of this disclosure is, in view of the above-mentioned problems, to provide a laminated material structure in which multiple laminated materials are firmly joined together in a state where they are constrained to one another, and a method for joining laminated materials. [Means for solving the problem]

[0006] The laminated structure according to the first aspect of this disclosure is 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 formed by alternately laminating a first wood piece having a first protruding end that protrudes from a first reference plane and a second wood piece having a first non-protruding end that coincides with the first reference plane. The second laminated material has a second comb-shaped end formed by alternately laminating a third piece of wood having a second protruding end that protrudes from the second reference plane and a fourth piece of wood having a second non-protruding end that coincides with the second reference plane. The first comb-shaped end includes at least one first non-protruding end, the first protruding ends on both sides thereof, and a groove between the first protruding ends with the first non-protruding end as the bottom. The second comb-shaped end includes at least one second protruding end and the second non-protruding ends on both sides thereof, By inserting the second protruding end into the groove until the second non-protruding end abuts against the first protruding end, a first overlapping portion is formed in which the first and second protruding ends alternately overlap. By inserting rod-shaped fasteners in the direction of overlap into the first overlapping section, the second overlapping section in which the first and second pieces of wood overlap alternately, and the third overlapping section in which the third and fourth pieces of wood overlap alternately, the first laminated material and the second laminated material are joined together while being constrained by each other.

[0007] In the above laminated material structure, The rod-shaped fastener may be inserted in four locations in the thickness direction of the first overlapping portion, in two locations in the thickness direction of the second overlapping portion, and in two locations in the thickness direction of the third overlapping portion. Furthermore, in the above laminated material structure, The rod-shaped fastener may be a wood screw having a threaded portion or a pin without a threaded portion.

[0008] The laminated material joining method according to a second aspect of this disclosure is: A method for joining a first laminated material and a second laminated material, The first laminated material has a first comb-shaped end formed by alternately laminating wood having a first protruding end portion protruding from a first reference plane and wood having a first non-protruding end portion that coincides with the first reference plane. The second laminated material has a second comb-shaped end formed by alternately laminating wood having a second protruding end portion protruding from a second reference plane and wood having a second non-protruding end portion that coincides with the second reference plane. The first comb-shaped end includes at least one of the first non-protruding end portions, the first protruding end portions on both sides thereof, and a groove portion between the first protruding end portions having the first non-protruding end portion as the bottom. The second comb-shaped end includes at least one of the second protruding end portions and the second non-protruding end portions on both sides thereof. An overlapping portion forming step of forming a first overlapping portion overlapping each other 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 rod-shaped fastener inserting step of inserting a rod-shaped fastener in the overlapping direction into each of the first overlapping portion, a second overlapping portion in which the first wood, the second wood, and the third wood and the fourth wood overlap alternately, and a third overlapping portion in which the third wood and the fourth wood overlap alternately, whereby the first laminated material and the second laminated material are joined in a state of being constrained to each other.

Effect 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 in a state of being constrained to each other without using an adhesive, and a method for joining laminated materials.

Brief Description of the Drawings

[0010] [Figure 1] It is a perspective view of an L-shaped laminated material structure 10. [Figure 2] It is an exploded perspective view of a first laminated material 20 and a second laminated material 30 constituting an L-shaped laminated material structure 10. <0​​​​(a)(b) Side views of the first wood 21 and the fourth wood 32 extracted from the laminated material structure 10 in FIG. 1. [Figure 5] (a)(b) Side views of the second wood 22 and the third wood 31 extracted from the laminated material structure 10 in FIG. 1. **Mode for Carrying Out 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 reference numerals are assigned to the same elements, and for the sake of clarity of explanation, duplicate explanations may be omitted as necessary.

[0012] The laminated material structure of the present embodiment is configured by joining a plurality of laminated materials. For example, by combining two laminated materials, an L-shaped laminated material structure (see FIG. 1) can be configured. Also, by combining four laminated materials, a rectangular laminated material structure (see FIG. 3) can be configured. FIG. 1 is a perspective view of an L-shaped laminated material structure 10. FIG. 2 is an exploded perspective view of the first laminated material 20 and the 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] Hereinafter, as an example, an example of configuring an L-shaped laminated material structure 10 by combining the first laminated material 20 and the second laminated material 30 will be described.

[0014] As shown in FIG. 2, the first laminated material 20 forms a plurality of through holes H in the lamination direction of a plurality of first woods 21 and second woods 22 laminated on each other. 20 The plurality of through holes H <​​​​The first laminated material 20 has a first comb-shaped end 24, which is formed by alternately laminating a first wood 21 having a first protruding end 21a that protrudes from the first reference plane P1 (see Figure 2) and a second 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 ends 21a on both sides thereof, and a groove 25 between the first protruding ends 21a with the first non-protruding end 22a as its base.

[0017] Similarly, as shown in Figure 2, the second laminated material 30 has multiple through holes H in the lamination direction of the multiple third woods 31 and fourth woods 32 that are laminated together. 30 Forms the plurality of through holes H 30 Each of the third and fourth pieces of wood 31 and 42 is constructed by pressing in a wooden dowel 33 and continuously joining them together. The number of third and fourth pieces of wood 31 and 42 that make up the second laminated wood 30 does not need to be more than four. For convenience, the wooden dowel 33 is not shown in Figure 1.

[0018] The second laminated material 30 has a second comb-shaped end 34, which is formed by alternately laminating a third piece of wood 31 having a second protruding end 31a that protrudes 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-shaped 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 Figure 1, by inserting the second protruding end 31a into the groove 25 until the second non-protruding end 32a abuts against the first protruding end 21a, an overlapping portion 40 (an example of the first overlapping portion in this disclosure) is formed in which the first protruding end 21a and the second protruding end 31a alternately overlap.

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

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

[0023] If the rod-shaped fasteners p1 to p8 are wood screws, the first laminated material 20 and the second laminated material 30 are firmly joined in a restrained state by screwing the wood screws in the overlapping direction of each overlapping section. Alternatively, the first laminated material 20 and the second laminated material 30 can also be firmly joined in a restrained state by forming pilot holes (through holes) in the overlapping direction of each overlapping section and screwing wood screws into these pilot holes. Note that the rod-shaped fasteners p1 to p8 are not limited to wood screws; they may also be metal pins without threads. If the rod-shaped fasteners p1 to p8 are pins, the first laminated material 20 and the second laminated material 30 are joined in a restrained state by forming through holes in the overlapping direction of each overlapping section and press-fitting the pins into these through holes.

[0024] Next, we will specifically explain where to insert the rod-shaped fasteners p1 to p8.

[0025] Figures 4(a) and 4(b) are side views of the first timber 21 and the fourth timber 32 extracted from the laminated timber structure 10 in Figure 1.

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

[0027] First, let's explain where the rod-shaped fasteners p1 and p2 are inserted.

[0028] As shown in Figure 4(a), when the first timber 21 and the fourth timber 32 are arranged with the second non-protruding end 32a in contact with the first protruding end 21a, if the fourth timber 32 attempts to rotate in the direction of arrow Ar2, further rotation is prevented because the two materials come into contact with each other at the upper portion of the interface Pa between the first timber 21 and the fourth timber 32 (see hatched area A1 in Figure 4(a)). On the other hand, as shown in Figure 4(a), when the first timber 21 and the fourth timber 32 are arranged with the second non-protruding end 32a in contact with the first protruding end 21a, if the fourth timber 32 attempts to rotate in the direction of arrow Ar2, the two materials attempt to move away from each other at the lower portion of the interface Pa between the first timber 21 and the fourth timber 32 (see arrow Ar3 in Figure 4(a)).

[0029] In order to prevent the first wood 21 and the fourth wood 32 from moving away from each other and creating a gap at the lower portion of the interface Pa between them, rod-shaped fasteners p1 and p2 are inserted into the interface Pa on one side and the other side, respectively, as shown in Figure 4(a). As a result, 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 positioned on one side of the interface Pa (left side in Figure 4(a), that is, the overlapping portion 40 where the first protruding end 21a and the second protruding end 31a alternately overlap), and on the central axis AX of the fourth wood 32. 32 It is inserted in the direction of overlap in the lower portion. On the other hand, the other rod-shaped fastener p2 is on the other side with respect to the interface Pa (right side in Figure 4(a), that is, the overlapping portion where the third wood 31 and the fourth wood 32 overlap alternately), and along the central axis AX of the fourth wood 32. 32 It is inserted in the direction of overlap in the lower part.

[0031] As described above, the inserted rod-shaped fasteners p1 and p2 allow the first laminated material 20 and the second laminated material 30 to be joined in a restrained state, thereby preventing them from moving away from each other (see arrow Ar3 in Figure 4(a)) at the lower portion of the interface Pa between the first wood 21 and the fourth wood 32, and preventing them from separating.

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

[0033] As shown in Figure 4(b), when the first timber 21 and the fourth timber 32 are arranged with the second non-protruding end 32a in contact with the first protruding end 21a, if the fourth timber 32 attempts to rotate in the direction of arrow Ar4, further rotation is prevented because the two timbers come into contact with each other at the lower portion of the interface Pa between the first timber 21 and the fourth timber 32 (see hatched area A2 in Figure 4(b)). On the other hand, as shown in Figure 4(b), when the first timber 21 and the fourth timber 32 are arranged with the second non-protruding end 32a in contact with the first protruding end 21a, if the fourth timber 32 attempts to rotate in the direction of arrow Ar4, the two timbers attempt to move away from each other at the upper portion of the interface Pa between the first timber 21 and the fourth timber 32 (see arrow Ar5 in Figure 4(b)).

[0034] In order to prevent the first wood 21 and the fourth wood 32 from moving away from each other and creating a gap at the upper portion of the interface Pa, rod-shaped fasteners p3 and p4 are inserted into the interface Pa on one side and the other side, respectively, as shown in Figure 4(b). As a result, the first laminated material 20 and the second laminated material 30 are joined in a restrained state.

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

[0036] Due to the rod-shaped fasteners p3 and p4 inserted as described above, the first laminated material 20 and the second laminated material 30 are joined in a mutually constrained state, so that at the upper part of the boundary surface Pa between the first wood 21 and the fourth wood 32, they move in a direction in which they separate from each other (see arrow Ar5 in FIG. 4(b)), and it is prevented that an opening occurs between them.

[0037] FIGS. 5(a) and 5(b) are side views of the second wood 22 and the third wood 31 extracted from the laminated material structure 10 in FIG. 1.

[0038] In FIGS. 5(a) and  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 FIG. 5(a), when the second wood 22 and the third wood 31 are arranged in a state where the first non-projecting end portion 22a abuts on the second projecting end portion 31a, if the third wood 31 attempts to rotate in the direction of arrow Ar6, at the inner part of the boundary surface Pb between the second wood 22 and the third wood 31 (the first non-projecting end portion 22a and the second projecting end portion 31a) (see the hatched area A3 in FIG. 5(a)), they abut on each other, thereby preventing further rotation. On the other hand, as shown in FIG. 5(a), when the second wood 22 and the third wood 31 are arranged in a state where the first non-projecting end portion 22a abuts on the second projecting end portion 31a, if the third wood 31 attempts to rotate in the direction of arrow Ar6, at the outer part of the boundary surface Pb between the second wood 22 and the third wood 31, they tend to move in a direction in which they separate from each other (see arrow Ar7 in FIG. 5(a)). [[ID= - 25]] [[ID= - 26]]

[0041] [[ID= -In order to prevent the second wood 22 and the third wood 31 from moving away from each other and creating a gap at the outer portion of the interface Pb between them, rod-shaped fasteners p5 and p6 are inserted into the interface Pb on one side and the other side, respectively, as shown in Figure 5(a). As a result, the first laminated material 20 and the second laminated material 30 are joined in a restrained state.

[0042] Specifically, one rod-shaped fastener p5 is positioned on one side of the interface Pb (the lower side in Figure 5(a), i.e., the overlapping portion 40 where the first protruding end 21a and the second protruding end 31a alternately overlap), and along the central axis AX of the second wood 22. 22 It is inserted in the direction of overlap in the outer part. On the other hand, the other rod-shaped fastener p6 is on the other side with respect to the interface Pb (the upper side in Figure 5(a), that is, the overlapping part where the first wood 21 and the second wood 22 overlap alternately), and along the central axis AX of the second wood 22. 22 It is inserted in the direction of overlap in the outermost part.

[0043] As described above, the inserted rod-shaped fasteners p5 and p6 allow the first laminated material 20 and the second laminated material 30 to be joined in a restrained state, thereby preventing them from moving away from each other (see arrow Ar7 in Figure 5(a)) at the outer portion of the interface Pb between the second wood 22 and the third wood 31, and thus preventing them from separating.

[0044] Next, we will explain where to insert the rod-shaped fasteners p7 and p8.

[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 in contact with the second protruding end 31a, if the third wood 31 attempts to rotate in the direction of arrow Ar8, further rotation is prevented because the two woods come into contact with each other at the outer portion of the interface Pb between the second wood 22 and the third wood 31 (see hatched area A4 in Figure 5(b)). 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 in contact with the second protruding end 31a, if the third wood 31 attempts to rotate in the direction of arrow Ar8, the two woods attempt to move away from each other at the inner portion of the interface Pb between the second wood 22 and the third wood 31 (see arrow Ar9 in Figure 5(b)).

[0046] In order to prevent the second wood 22 and the third wood 31 from moving away from each other and creating a gap at the inner portion of the interface Pb between them, rod-shaped fasteners p7 and p8 are inserted into the interface Pb on one side and the other side, respectively, as shown in Figure 5(b). As a result, the first laminated material 20 and the second laminated material 30 are joined in a restrained state.

[0047] Specifically, one rod-shaped fastener p7 is positioned on one side of the interface Pb (the lower side in Figure 5(b), i.e., the overlapping portion 40 where the first protruding end 21a and the second protruding end 31a overlap alternately), and along the central axis AX of the second wood 22. 22 It is inserted in the direction of overlap in the inner part. On the other hand, the other rod-shaped fastener p8 is on the other side with respect to the interface Pb (the upper side in Figure 5(b), that is, the overlapping part where the first wood 21 and the second wood 22 overlap alternately), and along the central axis AX of the second wood 22. 22 It is inserted in the direction of overlap in the inner part.

[0048] As described above, the inserted rod-shaped fasteners p7 and p8 allow the first laminated material 20 and the second laminated material 30 to be joined in a restrained state, thereby preventing them from moving away from each other (see arrow Ar9 in Figure 5(b)) at the inner portion of the interface Pb between the second wood 22 and the third wood 31, and preventing them from separating.

[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 and 30 are firmly joined together in a restrained state by rod-shaped fasteners p1 to p8 without using adhesive.

[0050] This disclosure is not limited to the embodiments described above, and may be modified as appropriate without departing from its spirit. Furthermore, this disclosure may be implemented by combining the respective embodiments as appropriate.

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

[0052] 10, 10A... Laminated material structure 20…First laminated material 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 laminated material 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 hole P1…1st reference plane P2…Second reference plane Pa, Pb... boundary planes p1―p8… Rod-shaped connective tissue

Claims

1. An L-shaped laminated material structure formed by joining a first laminated material and a second laminated material, The first laminated material has a first wood piece having a first protruding end that protrudes from a first reference plane, a second wood piece separate from the first wood piece having a first non-protruding end that coincides with the first reference plane, and a first comb-shaped end formed by alternately laminating the first wood piece and the second wood piece. The second laminated material has a third piece of wood having a second protruding end that protrudes from the second reference plane, a fourth piece of wood separate from the third piece of wood having a second non-protruding end that coincides with the second reference plane, and a second comb-shaped end formed by alternately laminating the third piece of wood and the fourth piece of wood. The first comb-shaped end includes at least one first non-protruding end, the first protruding ends on both sides thereof, and a groove between the first protruding ends with the first non-protruding end as the bottom. The second comb-shaped end includes at least one second protruding end and the second non-protruding ends on both sides thereof, By inserting the second protruding end into the groove until the second non-protruding end abuts against the first protruding end, a first overlapping portion is formed in which the first and second protruding ends alternately overlap. By inserting rod-shaped fasteners in the direction of overlap into the first overlapping portion, the second overlapping portion where the first and second pieces of wood overlap alternately, and the third overlapping portion where the third and fourth pieces of wood overlap alternately, the first laminated material and the second laminated material are joined together in a restrained state. The first, second, third, and fourth pieces of wood are each a single piece of wood. The rod-shaped fasteners are inserted in the overlapping direction of the first overlapping portion at two locations in the width direction of the second laminated material in the first overlapping portion on one side relative to the interface between the first protruding end and the second non-protruding end; inserted in the overlapping direction of the third overlapping portion at two locations in the width direction of the second laminated material in the third overlapping portion on the other side relative to the interface between the first protruding end and the second non-protruding end; inserted in the overlapping direction of the first overlapping portion at two locations in the width direction of the first laminated material in the first overlapping portion on one side relative to the interface between the first non-protruding end and the second protruding end; and inserted in the overlapping direction of the second overlapping portion at two locations in the width direction of the first laminated material in the second overlapping portion on the other side relative to the interface between the first non-protruding end and the second protruding end.

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 without a threaded portion.

3. An L-shaped laminated material joining method for joining a first laminated material and a second laminated material, The first laminated material has a first wood piece having a first protruding end that protrudes from a first reference plane, a second wood piece separate from the first wood piece having a first non-protruding end that coincides with the first reference plane, and a first comb-shaped end formed by alternately laminating the first wood piece and the second wood piece. The second laminated material has a third piece of wood having a second protruding end that protrudes from the second reference plane, a fourth piece of wood separate from the third piece of wood having a second non-protruding end that coincides with the second reference plane, and a second comb-shaped end formed by alternately laminating the third piece of wood and the fourth piece of wood. The first comb-shaped end includes at least one first non-protruding end, the first protruding ends on both sides thereof, and a groove between the first protruding ends with the first non-protruding end as the bottom. The second comb-shaped end includes at least one second protruding end and the second non-protruding ends on both sides thereof, The first, second, third, and fourth pieces of wood are each a single piece of wood. An overlapping portion forming step is performed by inserting the second protruding end into the groove until the second non-protruding end abuts against the first protruding end, thereby forming a first overlapping portion in which the first and second protruding ends alternately overlap. The method includes a rod-shaped fastener insertion step, in which a rod-shaped fastener is inserted in the direction of the overlap into each of the first overlapping portion, the second overlapping portion in which the first and second pieces of wood overlap alternately, and the third overlapping portion in which the third and fourth pieces of wood overlap alternately, thereby joining the first laminated material and the second laminated material in a restrained state. The aforementioned rod-shaped fastener insertion step is, The process involves inserting the rod-shaped fastener into two locations in the width direction of the second laminated material on one side of the first overlapping portion with respect to the interface between the first protruding end and the second non-protruding end, in the overlapping direction of the first overlapping portion. A step of inserting the rod-shaped fastener into two locations in the width direction of the second laminated material on the other side of the third overlapping portion with respect to the interface between the first protruding end and the second non-protruding end, in the overlapping direction of the third overlapping portion. A step of inserting the rod-shaped fastener into two locations in the width direction of the first laminated material on one side of the first overlapping portion with respect to the interface between the first non-protruding end and the second protruding end, in the overlapping direction of the first overlapping portion. A method for joining laminated materials, comprising the step of inserting the rod-shaped fastener into two locations in the width direction of the first laminated material on the other side of the second overlapping portion with respect to the interface between the first non-protruding end and the second protruding end, in the overlapping direction of the second overlapping portion.

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