Joining structure, structural member, and joining method

Abstract

To provide a wooden member junction structure and a wooden member junction method capable of improving construction accuracy and workability.SOLUTION: A wooden member junction structure comprises a column 2 (first wooden member), a first steel plate 4 installed at the column 2, a beam 3 (second wooden member) and a second steel plate 5 installed at the beam 3. The first steel plate 4 comprises a first steel plate embedment part 41 embedded at the column 2 and a first steel plate projection part 42 integrated with the first steel plate embedment part 41 and projecting from the column 2. The second steel plate 5 comprises a second steel plate embedment part 51 embedded at the beam 3 and a second steel plate projection part 52 integrated with the second steel plate embedment part 51 and projecting from the beam 3. The first steel plate projection part 42 and the second steel plate projection part 52 are joined together.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention , contact combined structure structural members and and connection relates to a combining method.

Background Art

[0002] As a joining structure for joining wooden members, a joining structure is known in which a steel plate joined to one wooden member is inserted into a groove provided in the other wooden member, and the steel plate and the other wooden member are joined. In the joining structure disclosed in Patent Document 1, a drift pin is driven into a hole provided in the steel plate and a hole provided in the other wooden member to join the steel plate and the other wooden member. The joining of the steel plate and the other wooden member is performed on site.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The joining of steel materials and wooden members has high construction difficulty and may require a professional carpenter. In addition, there are variations in construction accuracy, and it takes effort to manage the construction accuracy. In particular, driving a drift pin on site has high construction difficulty, and the diameter of the hole for inserting the drift pin provided in the wooden member requires a construction accuracy of ±0, so it is difficult to absorb construction errors.

[0005] Therefore, an object of the present invention is to provide a joining structure ru tsutsu combined structure structural members and and connection a joining method that can improve construction accuracy and workability.

Means for Solving the Problems

[0006] To achieve the above objective, the wooden member joining structure according to the present invention comprises a first wooden member, a first steel plate installed on the first wooden member, a second wooden member, and a second steel plate installed on the second wooden member, wherein the first steel plate has a first steel plate embedded portion embedded in the first wooden member and a first steel plate protruding portion provided integrally with the first steel plate embedded portion and protruding from the first wooden member, and the second steel plate has a second steel plate embedded portion embedded in the second wooden member and a second steel plate protruding portion provided integrally with the second steel plate embedded portion and protruding from the second wooden member, and the first steel plate protruding portion and the second steel plate protruding portion are joined together.

[0007] To achieve the above objective, the wooden member joining structure according to the present invention comprises a steel plate installation step of installing a first steel plate on a first wooden member and a second steel plate on a second member, and a steel plate joining step of joining the first steel plate and the second steel plate, wherein the first steel plate has a first steel plate embedding portion embedded in the first wooden member and a first steel plate protruding portion provided integrally with the first steel plate embedding portion and protruding from the first wooden member, and the second steel plate has a second steel plate embedding portion embedded in the second wooden member and a second steel plate protruding portion provided integrally with the second steel plate embedding portion and protruding from the second wooden member, wherein in the steel plate installation step, the first steel plate embedding portion is embedded in the first wooden member and the second steel plate embedding portion is embedded in the second wooden member, and in the steel plate joining step, the first steel plate protruding portion and the second steel plate protruding portion are joined.

[0008] In this invention, the first steel plate is installed on the first wooden member and the second steel plate is installed on the second wooden member in advance at a factory or similar facility. Then, at the construction site, the first steel plate installed on the first wooden member and the second steel plate installed on the second wooden member are joined together, allowing the first and second wooden members to be joined easily and accurately.

[0009] Furthermore, in the joining structure for wooden members according to the present invention, the first wooden member and the first steel plate may be joined by a first drift pin inserted into a hole formed in the first wooden member and a hole formed in the embedded portion of the first steel plate, and the second wooden member and the second steel plate may be fixed by a second drift pin inserted into a hole formed in the second wooden member and a hole formed in the embedded portion of the second steel plate.

[0010] This configuration allows for precise installation of the steel plates onto the wooden components, as the joints between the wooden components and the steel plates can be made in a factory using drift pins. When making wooden components fire-resistant, the wooden components and steel plates can be joined using drift pins, and then a fire-resistant layer can be applied to the wooden components in a factory or other facility, reducing on-site work.

[0011] Furthermore, in the wooden member joining structure according to the present invention, the first steel plate projection and the second steel plate projection may be joined by high-tension bolts.

[0012] This configuration allows for a strong bond between the first steel plate and the second steel plate.

[0013] Furthermore, in the wooden member joining structure according to the present invention, the first steel plate may have a first receiving plate that is integrally provided with the first steel plate embedding portion and contacts the end face of the first wooden member, and the second steel plate may have a second receiving plate that is integrally provided with the second steel plate embedding portion and contacts the end face of the second wooden member.

[0014] This configuration allows for the transmission of stress between the first wooden member and the first steel plate by utilizing the bearing pressure between the first support plate and the first wooden member. It also allows for the transmission of stress between the second wooden member and the second steel plate by utilizing the bearing pressure between the second support plate and the second wooden member. This allows for a reduction in the number of drift pins used when joining wooden members and steel plates. [Effects of the Invention]

[0015] According to the present invention, construction accuracy and workability can be improved.

Brief Description of the Drawings

[0016] [Figure 1] It is a longitudinal sectional view of a joining structure of wooden members according to an embodiment of the present invention. [Figure 2] It is a sectional view taken along line A-A of FIG. 1. [Figure 3] It is a sectional view taken along line B-B of FIG. 1. [Figure 4] It is an exploded perspective view of a joining structure of wooden members.

Modes for Carrying Out the Invention

[0017] Hereinafter, a joining structure of wooden members and a method for joining wooden members according to an embodiment of the present invention will be described based on FIGS. 1 to 4. As shown in FIGS. 1 and 2, a joining structure 1 of wooden members according to the present embodiment is a joining structure between a wooden column 2 and a beam 3. In the present embodiment, the column 2 and the beam 3 correspond to the first wooden member and the second wooden member of the present invention. As shown in FIGS. 1 to 3, a concrete floor member 11 is provided above the column 2 and the beam 3 (see FIGS. 1 and 2). As shown in FIGS. 1, 2 and 4, a first steel plate 4 is installed on the column 2. A second steel plate 5 is installed on the beam 3. The column 2 and the beam 3 are joined by joining the first steel plate 4 and the second steel plate 5.

[0018] The column 2 and the beam 3 are joined in a state where the end face in the length direction of the beam 3 is horizontally opposed to the side face 21 of the column 2. In the length direction of the beam 3, the horizontal direction in which the side face 21 of the column 2 and the end face 31 of the beam 3 face each other is denoted as the X direction, and the horizontal direction orthogonal to the X direction in the width direction of the beam 3 is denoted as the Y direction. Among the X directions, the side on which the column 2 is arranged with respect to the beam 3 is denoted as one side of the X direction, and the side on which the column 2 is arranged with respect to the beam 3 is denoted as the other side of the X direction.

[0019] The first steel plate 4 has a first steel plate embedded portion 41 embedded in the upper end portion 22 of the column 2 and a first steel plate protruding portion 42 protruding to the other side in the X direction from the upper end portion 22 of the column 2. The first steel plate 4 is in a flat plate shape and is arranged in a direction such that the plate surface becomes a vertical surface facing the Y direction. The first steel plate 4 is arranged such that the first steel plate embedded portion 41 is on one side in the X direction and the first steel plate protruding portion 42 is on the other side in the X direction. The first steel plate embedded portion 41 and the first steel plate protruding portion 42 are provided integrally. The plate surface of the first steel plate protruding portion 42 is in a rectangular shape that is long in the vertical direction. The plate surface of the first steel plate embedded portion 41 is in an L shape. The dimension in the vertical direction on the other side in the X direction (the side continuous with the first steel plate protruding portion 42) of the first steel plate embedded portion 41 is the same as the dimension in the vertical direction of the first steel plate protruding portion 42. The one side in the X direction (the side away from the first steel plate protruding portion 42) of the first steel plate embedded portion 41 extends downward more than the other side. In addition, the first steel plate 4 may have a shape other than the above as long as it has a configuration including the first steel plate embedded portion 41 and the first steel plate protruding portion 42.

[0020] A first groove portion 23 into which the first steel plate embedded portion 41 is fitted is formed in the upper end portion 22 of the column 2. The first groove portion 23 opens upward and on one side in the X direction. The first groove portion 23 is arranged at the central portion in the Y direction of the upper end portion 22 of the column 2. The first steel plate protruding portion 42 protrudes to one side in the X direction from the opening on one side in the X direction of the first groove portion 23. The upper edge portion of the first steel plate 4 is arranged at substantially the same height as the upper end of the column 2.

[0021] The column 2 and the first steel plate 4 are joined by a plurality of first drift pins 61. As shown in FIGS. 2 and 3, a plurality of hole portions 411 into which the first drift pins 61 are inserted are formed in the first steel plate embedded portion 41. A plurality of hole portions 24 are formed at positions overlapping in the Y direction with the plurality of hole portions 411 of the first steel plate embedded portion 41 in the upper end portion 22 of the column 2. The hole portions 24 reach the first groove portion 23 and penetrate the upper end portion 22 of the column 2 in the Y direction. The first drift pins 61 are inserted into the hole portions 24 of the column 2 and the hole portions 411 of the first steel plate embedded portion 41 in a state where the first steel plate embedded portion 41 of the first steel plate 4 is fitted into the first groove portion 23 of the column 2, joining the column 2 and the first steel plate 4.

[0022] As shown in Figures 1, 3, and 4, in this embodiment, the first steel plate 4 has a first support plate 43 joined to the upper edge of the first steel plate embedded portion 41. The first support plate 43 is flat and is joined to the upper edge of the first steel plate embedded portion 41 with its plate surface in a horizontal orientation. The center of the first support plate 43 in the Y direction is joined to the upper edge of the first steel plate embedded portion 41. The first steel plate embedded portion 41 and the first support plate 43 are joined in a T-shape when viewed from the X direction. The lower surface of the first support plate 43 is in contact with the upper end surface 221 of the column 2.

[0023] As shown in Figures 1, 2, and 4, the second steel plate 5 has a second steel plate embedding portion 51 embedded in one end portion 32 of the beam 3 in the X direction (length direction), and a second steel plate projection portion 52 that protrudes from the end portion 32 of the beam 3 to one side in the X direction. The second steel plate 5 is flat and is arranged so that its surface is a vertical plane facing the Y direction. The second steel plate 5 has the second steel plate projection portion 52 on one side in the X direction, and the second steel plate embedding portion 51 on the other side in the X direction. The second steel plate embedding portion 51 and the second steel plate projection portion 52 are provided integrally.

[0024] The surface of the second steel plate embedded portion 51 is a rectangular shape that is elongated in the vertical direction. The surface of the second steel plate protruding portion 52 is a rectangular shape that is elongated in the vertical direction. The dimensions of the second steel plate protruding portion 52 in the X direction and the vertical direction are smaller than those of the second steel plate embedded portion 51. The upper edge heights of the second steel plate embedded portion 51 and the second steel plate protruding portion 52 are the same. The lower edge of the second steel plate embedded portion 51 is positioned lower than the lower edge of the second steel plate protruding portion 52. The vertical dimension of the second steel plate embedded section 51 is the same as the vertical dimension (beam depth) of the beam 3. Furthermore, the second steel plate 5 may have a shape other than that described above, as long as it has a configuration that includes a second steel plate embedded portion 51 and a second steel plate protruding portion 52.

[0025] A second groove 33 (see Figures 2 and 4) is formed in the end portion 32 of the beam 3, into which the second steel plate projection 52 is fitted. The second groove 33 opens upward, downward, and on one side in the X direction. The second groove 33 is located in the center of the end portion 32 of the beam 3 in the Y direction. The second steel plate projection 52 protrudes from the opening on one side in the X direction of the second groove 33 to the one side in the X direction. The upper edge of the second steel plate 5 is positioned at approximately the same height as the upper end of the beam 3. The lower edge of the second steel plate 5, i.e., the lower edge of the second steel plate embedded portion 51, is positioned at the same height as the lower end of the beam 3.

[0026] The beam 3 and the second steel plate 5 are joined by a plurality of second drift pins 62. As shown in Figure 2, the embedded portion 51 of the second steel plate has a plurality of holes 511 into which the second drift pins 62 are inserted. The end portion 32 of the beam 3 has a plurality of holes 34 formed at positions that overlap in the Y direction with each of the plurality of holes 511 in the embedded portion 51 of the second steel plate. The holes 34 reach the second groove portion 33 and penetrate the end portion 32 of the beam 3 in the Y direction. The second drift pins 62 are inserted into the holes 34 of the beam 3 and the holes 511 of the embedded portion 51 of the second steel plate 5 when the embedded portion 51 of the second steel plate 5 is fitted into the second groove portion 33 of the beam 3, thereby joining the beam 3 and the second steel plate 5.

[0027] As shown in Figures 1 and 4, in this embodiment, the second steel plate 5 has a second support plate 53 joined to the lower edge of the second steel plate embedded portion 51. The second support plate 53 is flat and is joined to the lower edge of the second steel plate embedded portion 51 with its plate surface in a horizontal orientation. The center of the second support plate 53 in the Y direction is joined to the lower edge of the second steel plate embedded portion 51. The second steel plate embedded portion 51 and the second support plate 53 are joined in a T-shape when viewed from the X direction. The upper surface of the second support plate 53 is in contact with the lower surface of the end portion 32 of the beam 3.

[0028] The column 2 on which the first steel plate 4 is installed and the beam 3 on which the second steel plate 5 is installed are joined by the first steel plate projection 42 of the first steel plate 4 and the second steel plate projection 52 of the second steel plate 5 being abutted in the X direction, with a reinforcing plate 72 overlapping and joined with high-tension bolts 71. In Figure 4, one of the reinforcing plates 72 and high-tension bolts 71 are omitted.

[0029] Columns 2 and beams 3 are provided with fire-resistant layers 81 and 82 on their surfaces and are used as fire-resistant wooden members. The fire-resistant layer 81 of column 2 covers the outer circumference of column 2 on which the first steel plate 4 is installed. The end face of the first drift pin 61 that joins column 2 and the first steel plate 4 is covered with the fire-resistant layer 81. The fire-resistant layer 82 of beam 3 covers the end face 31, both sides 36, and bottom face 37 of beam 3 where the second steel plate 5 is attached. The end face of the second drift pin 62 that joins beam 3 and the second steel plate 5 is covered with the fire-resistant layer 82.

[0030] The first steel plate projection 42 of the first steel plate 4, the second steel plate projection 52 of the second steel plate 5, the high-tension bolt 71, and the reinforcing plate 72 are covered with a fire-resistant coating material 83.

[0031] The method for joining wooden members according to this embodiment will be described. First, the first steel plate 4 is joined to the column 2, and the second steel plate 5 is joined to the beam 3 (steel plate installation process). A first groove 23 and a hole 24 are formed in the column 2. The first embedded portion 41 of the first steel plate 4 is inserted into the first groove 23, and the first receiving plate 43 is brought into contact with the upper end surface 221 of the column 2. The first embedded portion 41 of the steel plate is joined to the column 2 with the first drift pin 61. A second groove 33 and a hole 34 are formed in the beam 3. The second steel plate embedding portion 51 of the second steel plate 5 is inserted into the second groove 33, and the second receiving plate 53 is brought into contact with the lower surface 37 of the beam 3. The second steel plate embedding portion 51 is joined to the beam 3 with a second drift pin 62.

[0032] A fire-resistant layer 81 is provided on the column 2 on which the first steel plate 4 is installed, and a fire-resistant layer 82 is provided on the beam 3 on which the second steel plate 5 is installed (first fire-resistant material installation process). The steel plate installation process and the first fire-resistant material installation process can be carried out at a factory or other location, rather than at the construction site.

[0033] At the construction site, a column 2 with the first steel plate 4 installed is erected. A beam 3 with the second steel plate 5 installed is lifted, and the first steel plate 4 and the second steel plate 5 are joined together (steel plate joining process). The first steel plate 4 and the second steel plate 5 are joined together with high-tension bolts. After the steel plate joining process, a second fire-resistant layer installation process is performed in which fire-resistant coating material 83 is applied to the first steel plate protrusion 42 of the first steel plate 4, the second steel plate protrusion 52 of the second steel plate 5, the high-tension bolts 71, and the reinforcing plate 72. In this way, column 2 and beam 3 are joined together.

[0034] Next, the operation and effects of the wooden member joining structure and wooden member joining method according to the above embodiment will be described. In the wooden member joining structure 1 and wooden member joining method according to the above embodiment, the first steel plate 4 is installed on the column 2 and the second steel plate 5 is installed on the beam 3 in advance at a factory or the like, and the first steel plate 4 installed on the column 2 and the second steel plate 5 installed on the beam 3 are joined on site, making it possible to easily and accurately join the column 2 and the beam 3.

[0035] In the wooden member joining structure 1 according to the above embodiment, the column 2 and the first steel plate 4 are joined by a first drift pin 61 inserted into a hole 24 formed in the column 2 and a hole 411 formed in the first steel plate embedding portion 41, and the beam 3 and the second steel plate 5 are fixed by a second drift pin 62 inserted into a hole 34 formed in the beam 3 and a hole 511 formed in the second steel plate embedding portion 51. This configuration allows the wooden members (columns 2, beams 3) and steel plates (first steel plate 4, second steel plate 5) to be joined using drift pins 61 and 62 in a factory, thus enabling precise installation of the steel plates onto the wooden members. When making wooden components fire-resistant, the wooden components and steel plates can be joined using drift pins 61 and 62, and then the fire-resistant layers 81 and 82 can be applied to the wooden components in a factory or other facility, reducing on-site work.

[0036] In the wooden member joint structure 1 according to the above embodiment, the first steel plate projection 42 and the second steel plate projection 52 are joined by high-tension bolts. This configuration allows for a strong bond between the first steel plate 4 and the second steel plate 5.

[0037] In the wooden member joining structure 1 according to the above embodiment, the first steel plate 4 is provided with a first receiving plate 43, and the second steel plate 5 is provided with a second receiving plate 53. This configuration allows for the transmission of stress between the column 2 and the first steel plate 4 by utilizing the bearing pressure between the first support plate 43 and the column 2. It also allows for the transmission of stress between the beam 3 and the second steel plate 5 by utilizing the bearing pressure between the second support plate 53 and the beam 3. The number of first drift pins 61 and second drift pins 62 can be reduced.

[0038] Although embodiments of the wooden member joining structure and wooden member joining method according to the present invention have been described above, the present invention is not limited to the above embodiments and can be modified as appropriate without departing from the spirit of the invention. For example, in the above embodiment, the first steel plate projection 42 of the first steel plate 4 and the second steel plate projection 52 of the second steel plate 5 are joined by high-tension bolts, but they may also be joined by bolts, welding, or other methods. In the above embodiment, the first steel plate 4 is joined to the column 2 with a first drift pin 61, and the second steel plate 5 is joined to the beam 3 with a second drift pin 62. However, the joining of the first steel plate 4 to the wooden member and the joining of the second steel plate 5 to the wooden member may be done by fasteners other than drift pins or by adhesives.

[0039] In the above embodiment, the first embedded portion 41 of the first steel plate 4 is fitted into the first groove 23 formed in the column 2, and the second embedded portion 51 of the second steel plate 5 is fitted into the second groove 33 formed in the beam 3. In contrast, if the wooden member is CLT (cross-laminated timber), the first embedded portion 41 of the first steel plate 4 and the second embedded portion 51 of the second steel plate 5 may be embedded during the process of processing the wooden member.

[0040] In the above embodiment, the beam 3 is joined to the column 2 from one direction. However, if the beam 3 is joined to the column 2 from multiple directions, a second steel plate 5 may be provided on each beam 3, and a first steel plate 4, which is joined to the second steel plate 5 of each beam 3, may be installed on the column 2, thereby joining the first steel plate 4 and the second steel plate 5.

[0041] In the above embodiment, the first receiving plate 43 is provided on the first steel plate 4, but it is not required. In the above embodiment, the second receiving plate 53 is provided on the second steel plate 5, but it is not required. In the above embodiment, fire-resistant layers 81 and 82 are provided on the column 2 and beam 3, and a fire-resistant covering material 83 is provided at the joint between the first steel plate 4 and the second steel plate 5. However, the fire-resistant layers 81 and 82 and the fire-resistant covering material 83 do not necessarily have to be provided. [Explanation of Symbols]

[0042] 1 Joint structure 2. Column (First Member) 3. Beam (Second Member) 4 First steel plate 5 Second steel plate 24 Hole 34 Hole 41 First steel plate buried section 42 First steel plate protrusion 43 First receiving plate 53 Second receiving plate 51 2nd steel plate buried section 52 Second steel plate protrusion 61. First drift pin 62. Second drift pin 71 High-tension bolts 81,82 Fireproof layer 83 Fireproof cladding 411 Hole 511 Hole

Claims

1. First wooden member and, The first steel plate installed on the first wooden member, The second wooden member, It comprises a second steel plate installed on the second wooden member, The first steel plate is, The first steel plate embedding portion is embedded in the first wooden member, It has a first steel plate projection that is provided integrally with the first steel plate embedded portion and protrudes from the first wooden member, The second steel plate is The second steel plate embedding portion is embedded in the second wooden member, It has a second steel plate projection that is provided integrally with the second steel plate embedded portion and protrudes from the second wooden member, The lower edge of at least one of the first steel plate embedded portion and the second steel plate embedded portion is positioned below the lower edge of the first steel plate protrusion or the second steel plate protrusion. The first steel plate projection and the second steel plate projection are joined together. The first steel plate has a first receiving plate which is integrally provided with the first steel plate embedded portion and contacts the end face of the first wooden member. The second steel plate has a second receiving plate which is integrally provided with the embedded portion of the second steel plate and contacts the end face of the second wooden member. The first receiving plate is joined to the upper edge of the first steel plate embedded portion, and its lower surface is in contact with the upper end surface of the first wooden member. The second receiving plate is joined to the lower edge of the second steel plate embedded portion, and its upper surface is in contact with the lower end surface of the second wooden member, thus forming a joint structure.

2. First wooden member and, The first steel plate installed on the first wooden member, The second wooden member, It comprises a second steel plate installed on the second wooden member, The first steel plate is, The first steel plate embedding portion is embedded in the first wooden member, It has a first steel plate projection that is provided integrally with the first steel plate embedded portion and protrudes from the first wooden member, The second steel plate is The second steel plate embedding portion is embedded in the second wooden member, It has a second steel plate projection that is provided integrally with the second steel plate embedded portion and protrudes from the second wooden member, The first steel plate projection and the second steel plate projection are joined together. The first steel plate has a first receiving plate which is integrally provided with the first steel plate embedded portion and contacts the end face of the first wooden member. The second steel plate has a second receiving plate which is integrally provided with the embedded portion of the second steel plate and contacts the end face of the second wooden member. The first receiving plate is joined to the upper edge of the first steel plate embedded portion, and its lower surface is in contact with the upper end surface of the first wooden member. The second receiving plate is joined to the lower edge of the second steel plate embedded portion, and its upper surface is in contact with the lower end surface of the second wooden member, thus forming a joint structure.

3. The first wooden member and the first steel plate are joined together by a first drift pin inserted into a hole formed in the first wooden member and a hole formed in the embedded portion of the first steel plate. The joining structure according to claim 1 or 2, wherein the second wooden member and the second steel plate are fixed together by a second drift pin inserted into a hole formed in the second wooden member and a hole formed in the embedded portion of the second steel plate.

4. The joining structure according to any one of claims 1 to 3, wherein the first steel plate projection and the second steel plate projection are joined by a high-tension bolt.

5. Wooden components, The first steel plate is installed on the wooden member, The first steel plate is, The steel plate embedded portion is embedded in the aforementioned wooden member, It has a steel plate projection that is provided integrally with the steel plate embedding portion, protrudes from the wooden member, and can be joined to a second steel plate different from the first steel plate, The lower edge of the embedded steel plate portion is positioned below the lower edge of the protruding steel plate portion. The first steel plate has a receiving plate that is integrally provided with the embedded steel plate portion and contacts the end face of the wooden member, The receiving plate is a structural member that is joined to the upper edge of the embedded steel plate portion and whose lower surface is in contact with the upper end surface of the wooden member.

6. A steel plate installation process in which a first steel plate is installed on a first wooden member and a second steel plate is installed on a second wooden member, The process includes a steel plate joining step of joining the first steel plate and the second steel plate, The first steel plate is, The first steel plate embedding portion is embedded in the first wooden member, It has a first steel plate projection that is provided integrally with the first steel plate embedded portion and protrudes from the first wooden member, The second steel plate is The second steel plate embedding portion is embedded in the second wooden member, It has a second steel plate projection that is provided integrally with the second steel plate embedded portion and protrudes from the second wooden member, The lower edge of at least one of the first steel plate embedded portion and the second steel plate embedded portion is positioned below the lower edge of the first steel plate protrusion or the second steel plate protrusion. The first steel plate has a first receiving plate which is integrally provided with the first steel plate embedded portion and contacts the end face of the first wooden member. The second steel plate has a second receiving plate which is integrally provided with the embedded portion of the second steel plate and contacts the end face of the second wooden member. The first receiving plate is joined to the upper edge of the first steel plate embedded portion, and its lower surface is in contact with the upper end surface of the first wooden member. The second receiving plate is joined to the lower edge of the second steel plate embedded portion, and its upper surface is in contact with the lower end surface of the second wooden member. In the steel plate installation process, the first steel plate embedding portion is embedded in the first wooden member, and the second steel plate embedding portion is embedded in the second wooden member. The steel plate joining process is a joining method for joining the first steel plate protrusion and the second steel plate protrusion.

7. A steel plate installation process in which a first steel plate is installed on a first wooden member and a second steel plate is installed on a second wooden member, The process includes a steel plate joining step of joining the first steel plate and the second steel plate, The first steel plate is, The first steel plate embedding portion is embedded in the first wooden member, It has a first steel plate projection that is provided integrally with the first steel plate embedded portion and protrudes from the first wooden member, The second steel plate is The second steel plate embedding portion is embedded in the second wooden member, It has a second steel plate projection that is provided integrally with the second steel plate embedded portion and protrudes from the second wooden member, The first steel plate has a first receiving plate which is integrally provided with the first steel plate embedded portion and contacts the end face of the first wooden member. The second steel plate has a second receiving plate which is integrally provided with the embedded portion of the second steel plate and contacts the end face of the second wooden member. The first receiving plate is joined to the upper edge of the first steel plate embedded portion, and its lower surface is in contact with the upper end surface of the first wooden member. The second receiving plate is joined to the lower edge of the second steel plate embedded portion, and its upper surface is in contact with the lower end surface of the second wooden member. In the steel plate installation process, the first steel plate embedding portion is embedded in the first wooden member, and the second steel plate embedding portion is embedded in the second wooden member. The steel plate joining process is a joining method for joining the first steel plate protrusion and the second steel plate protrusion.

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