JP6503318B2 - Connected structure - Google Patents

Description

  The present invention relates to a connection structure using an orthogonal plate in at least one of two members to be connected.

  It is essential for structural materials to be a framework of wooden buildings to have stable strength, and various laminated materials are often used. Also, in recent years, "cross-laminated board", which is a laminated material with excellent strength, has begun to spread. The orthogonal laminated plate is formed by bonding plate members called laminae by adhesion, and adjacent laminae differ in the direction of wood grain by almost 90 degrees and cancel the directionality of strength. This cross-laminated board is generally called CLT, and its thickness often exceeds 100 mm, and due to its excellent characteristics, high-rise wooden buildings are expected. The cross-laminated plate is distributed as a plate material literally, but it can also be used as a rod-like member such as a column or a horizontal member by cutting into a predetermined size.

  In wooden construction, when installing large cross-section members such as cross-laminated boards, various types of hardware are often used. A large number of patent documents have been published so far regarding the connection structure using various kinds of metal objects, and among them, the following patent documents can be mentioned as an example of a technique related to the present invention. Among them, Patent Document 1 discloses a connection structure in which the projection of the column to the indoor side can be suppressed and the rigidity can be secured in the mounting portion between the column and the beam.

  The connection structure of Patent Document 1 is characterized in that the intermediate material is sandwiched between the side surface of the column and the end surface of the beam, and the column and the intermediate material are integrated by an outer lug screw and a screw nail. The large diameter outer lag screw is disposed near the center of the intermediate member, and the small diameter screw nail is disposed near the outer edge of the intermediate member, thereby firmly integrating the column and the intermediate member. Although the outer lag screw is excellent in strength, it is difficult to arrange a large number due to its size. On the other hand, the screw nails can be arranged so as to fill the gap of the outer lag screw with a small diameter, and such combined use makes it possible to secure rigidity while suppressing an increase in the cross section of the member.

  Patent Document 2 discloses a column installation structure. In this example, it is assumed that pillars are used and relatively thin columns are installed on foundation concrete. A large diameter main lag screw is embedded in the center of the lower surface of the column, and secondary lag screws are installed at the four corners of the column. Embed and pull the main lag screw and the secondary lag screw to the column base through bolts and nuts. Since the auxiliary lag screw has a small diameter, it can be placed near the side of the column, etc. By increasing the number, the installation strength can be improved even with a relatively thin column.

  As in these patent documents, in various connection structures, a large diameter lag screw is embedded in the center of the member, and a small diameter screw nail (a sub lag screw in patent document 2) is further inserted around it to obtain a tensile load. Transfer routes can be increased to prevent stress concentration. In particular, small diameter screw nails can be placed anywhere, and it is easy to increase their number. As a result, the member and the hardware are integrated into a planar shape, and the rigidity is also improved.

JP, 2012-167419, A JP, 2014-118718, A

  Wood has a difference in strength depending on its grain direction. Therefore, in the case of a lag screw or the like embedded in the cross-laminated plate in the connection structure using the cross-laminated plate, it is necessary to secure sufficient strength in consideration of the grain direction of the lamina. However, the form of the connection structure is various, and it is difficult to consider the grain direction for each individual connection structure, and a connection structure that can obtain stable strength under all conditions is desired.

  The present invention has been developed based on these circumstances, and aims to provide a connection structure that can obtain stable strength by utilizing the properties of cross-laminated boards.

  The invention according to claim 1 for solving the above-mentioned problems is a connection structure using a cross laminated plate for at least one of two members to be connected, wherein the cross laminated plate is different in grain direction A middle lamina and a side lamina are pasted together, the middle lamina being sandwiched between a pair of the side laminas, a connector interposed between two members to be connected, and a rod-like load bearing shaft embedded in the middle lamina; And a screw-like reinforcing member inserted into the side lamina, the joint including an abutment plate contacting the surface of the cross laminated plate, the abutment plate including the middle lamina and a pair of sandwiching the middle lamina The load-bearing shaft is fixed to the middle lamina, and the connector is drawn to the load-bearing shaft via a fixing tool such as a bolt, and the reinforcing tool is provided on the contact plate. Difference to the side lamina through the side hole Inclusive, attract the connectors on the side lamina, reinforcing tool is, for any pair of the side lamina, a connecting structure, characterized in that is plugged at least one.

  The present invention is intended to connect cross-laminates, commonly referred to as CLTs, but is intended for use in all situations, and in addition to the case of connecting two cross-laminates together, a single cross-laminate May be connected to other members or foundation concrete. In addition, other members mean various timbers and steel materials which are not cross-laminated boards. In addition, the form of the connection structure is also various, and in some cases, two connected members (including cross laminated plates and other members, including base concrete) may be arranged in an L shape or a T shape, and in some cases In some cases, the end faces of the members are butted to connect them in a straight line.

  The cross laminated board used in the present invention is assumed to be used as a structural material of a wooden building, and is cut into a necessary size in advance, and used in the same manner as a conventional pillar, a horizontal member and the like. The middle lamina and the side lamina are the individual laminas that make up the cross-laminate, and the middle lamina and the side lamina are disposed adjacent to each other, and both wood grain directions differ by approximately 90 degrees. The middle lamina is not exposed to the surface of the cross-laminate and is always sandwiched between adjacent side lamina. In addition, the lamina is at least three layers (a form in which the middle lamina is sandwiched between the side laminas), but in practice it often exceeds three layers. However, even in that case, in the present invention, only one medium is called middle lamina.

  The connector is an architectural hardware sandwiched between two members to be connected, and the two members are not in direct contact with each other, and are connected by sandwiching the connector. And although the shape of a joining tool may be decided freely each time based on the arrangement and the characteristic of two members connected, it shall have a contact board which contacts the surface of a cross lamination board. Note that the contact plate does not have to simply contact the surface of the cross plate, and the position and size are adjusted so that it contacts the middle lamina of the cross plate and any of the pair of side laminas sandwiching it. .

  The load-bearing shaft is a rod-like metal embedded in the middle lamina, which is firmly integrated with the middle lamina and plays a role of receiving the load acting on the cross laminated plate, and the whole thereof is sized to fit inside the middle lamina. As a specific example of a load bearing shaft, a lag screw or a deformed bar steel may be mentioned. The lag screw has a helical ridge formed on the side circumferential surface thereof, which bites into the inside of the middle lamina, thereby firmly integrating both. In addition, the deformed bar is fixed to the middle lamina with an adhesive. The end face of the load bearing shaft is exposed to the surface of the middle lamina and covered with the contact plate of the joint. Besides, a plurality of load bearing shafts may be used for one contact plate.

  The fixture is a bolt or a nut that draws the connector to the load bearing shaft. When a female screw is provided on one end face of the load bearing shaft, a fixing tool (bolt) is inserted from the contact plate toward the female screw, and the joint tool is pulled toward the load bearing shaft. Also, if a male screw protrudes from one end face of the load bearing shaft, this is inserted into the contact plate, and a fixing tool (nut) is screwed on the tip of this male screw. Thus, the connector is integrated with the cross-laid plate via the load bearing shaft and the fixture.

  The reinforcing member plays a role of assisting the load bearing shaft, and is a screw nail having a diameter smaller than that of the load bearing shaft, and is inserted from the contact plate toward the side lamina. For this purpose, the contact plate is provided with a side hole for inserting the reinforcement. Usually, after bringing the abutment plate into contact with the cross-laminate, the reinforcement is inserted from the side hole, but the reinforcement may be inserted into the cross-lamination in advance for the convenience of construction. In that case, a bolt may be inserted from the side hole toward the reinforcement. In addition, when the reinforcing tool in which the male screw is formed is inserted in advance, the male screw is inserted into the side hole, and the nut is screwed into the hole.

  At least one reinforcement shall be inserted for any of the pair of side laminae. The connector therefore integrates with both the inner and the individual side lamina in contact with the abutment plate. Reinforcement tools are smaller in diameter than the load-bearing shaft, and it is easy to increase their number. Therefore, even if the load that each reinforcement can receive is limited, it can receive a large load as a whole. In addition, since the reinforcements increase the adhesion between the joint and the cross-laminated board, bending moments can be received and rigidity is also improved.

  In this way, the load bearing shaft is embedded in the middle lamina, the reinforcement is inserted in the side lamina, and the joint is attached to the cross-laminated board via the load bearing shaft and the reinforcement, thereby the difference in strength depending on the grain direction of each lamina. It can be absorbed and a stable strength can be obtained under all conditions. Further, even if any one of the lamina is cracked, the remaining lamina is not affected, so that the reduction in strength is suppressed and safety problems are not caused. In the connection tool, various conventional techniques are used as they are for connection points other than the cross laminated board.

  As in the invention according to claim 1, in the connection structure using the cross laminated plate, the connector is sandwiched between the two members (including the cross laminated plate and the other members as well as the base concrete) to be connected. The contact plate of the connector is in contact with all of the middle lamina and the pair of side lamina of the cross-laminated board, and further the load bearing shaft is embedded in the middle lamina and integrated with the contact plate, and from the contact plate By inserting the reinforcements towards the individual side lamina, the joint is firmly integrated with the cross-laid board via the middle lamina and the individual side lamina.

  The reinforcement has a relatively small diameter and can be used more easily than the load-bearing shaft, and can receive a corresponding load. Therefore, the difference in strength due to the lamina grain direction can be absorbed, stable strength can be obtained under all conditions, and it is not necessary to examine the grain direction for each individual connected structure. Also, since the connector is integrated with the individual laminae, even if cracks occur in any of the laminae, the remaining laminae are not affected, so the reduction in strength is also suppressed, which causes a safety problem. Not cause In addition, by inserting a plurality of reinforcements, the connector and the cross assembly are integrated into a planar shape, and the rigidity is also improved.

The perspective view which shows the example of the connection structure by this invention, sandwiching a joining tool between two orthogonal laminated boards cut out to rod shape, and connecting both in L shape is assumed. It is a perspective view which shows the state which connected the orthogonal assembly boards of FIG. The perspective view which shows the connection structure different from FIG. 1 assumes using a rod-shaped cross-laminated board as a pillar, and installing the lower part in foundation concrete. It is a perspective view which shows the state which installed the orthogonal laminated board of FIG. 3 in the foundation concrete. It is a perspective view which shows the example of a joining tool and a load-bearing shaft, and although two orthogonal laminated boards are connected in L shape like FIG. 1, the crossing angle of orthogonal laminated boards can be adjusted. It is a perspective view which shows the state which connected the orthogonal assembly boards of FIG. In the upper right of the figure, a cross member immediately before connection is drawn. In the perspective view which shows the specific example of a connector and a reinforcement, a lag screw is used also about any of a load-bearing shaft and a reinforcement. It is a perspective view which shows the state which connected orthogonal assembly boards of FIG.

  FIG. 1 shows a specific example of the connection structure according to the present invention, and it is assumed that the joining tool 11 is sandwiched between two cross laminated plates 51, 61 cut out in a rod shape and the both are connected in an L shape. doing. In this figure, the cross plate 51 which is a column is arranged in a substantially square cross section so as to stand upright from the ground, and the cross plate 61 which is a cross member extends horizontally in a rectangular cross section which is long vertically. The one end faces the side of the column.

  Both of the cross laminations 51 and 61 have a three-layer structure, and both sides of the middle lamina 54 and 64 are sandwiched by the side laminas 55 and 65. Furthermore, in the middle laminas 54 and 64 and the side laminas 55 and 65, the wood grain direction differs by approximately 90 degrees, canceling the directionality of the intensity. The middle laminas 54 and 64 have a configuration in which a plurality of horizontally extending plate members are stacked up and down, three on the column side are stacked, and two on the horizontal member side are stacked. The side laminas 55 and 65 are formed of plate members extending in the vertical direction, and the boundary between the plate members is exposed on the side of the cross member.

  The connector 11 is an H shape in which two contact plates 16 aligned in parallel are connected by an intermediate plate 17 and disposed between the facing cross plates 51 and 61. However, the same items are used to ensure strength. Are arranged two above and below. And, in order to attach the joint tool 11 to the cross plate 51, 61, the load bearing shaft 31 and the reinforcement tool 41 are used. Among them, the bearing shaft 31 is a cylindrical lag screw, and is embedded in the lower holes 53, 63 formed in the middle lamina 54, 64 of both the cross-laminated plates 51, 61. Further, the reinforcing member 41 is a screw having a hexagonal head, and is inserted from the contact plate 16 of the joint 11 toward the side lamina 55, 65 of the cross plates 51, 61.

  The side peripheral surface of the bearing shaft 31 is formed with a ridge 35 extending in a spiral shape and this bites into the inner peripheral surface of the pilot holes 53 and 63 so that the bearing shaft 31 is integral with the orthogonal laminated plates 51 and 61. Turn Further, on one end surface of the load bearing shaft 31, a hexagonal head 36 is formed to hang a tool, and a female screw 37 is formed at the center thereof. It should be noted that although four load bearing shafts 31 are embedded in the upper and lower sides in any of the orthogonal laminated plates 51, 61, their head portions 36 can be arranged without any step difference with the entrances of the pilot holes 53, 63 and can also contact the joining tool Do.

  The connector 11 is attached to the load bearing shaft 31 via the fixture 27. The fixture 27 is a simple bolt and is inserted from the contact plate 16 of the connector 11 toward the female screw 37 of the load bearing shaft 31. For this purpose, at the center of the contact plate 16 is provided a bore 24 through which the shaft of the fixture 27 passes. Further, on the left and right sides of the contact plate 16, side holes 23 for passing the shaft portion of the reinforcing tool 41 are provided. Therefore, one contact plate 16 is fixed by two load bearing shafts 31 and four reinforcements 41. Although the load which can be received is small compared with the load bearing shaft 31, the reinforcing tool 41 can exhibit the capability equivalent to the load bearing shaft 31 by increasing the number.

  The reinforcing member 41 has a relatively small diameter, and in this figure, it is directly inserted into the side lamina 55, 65 without processing the pilot holes 53, 63 such as the middle lamina 54, 64. However, if there is a possibility that the side lamina 55, 65 may be cracked by inserting the reinforcing tool 41, some measures are taken. Further, when tightening the reinforcement 41, a tool such as a wrench is inserted from the side of the joint 11. In addition, at the time of construction, the bearing shaft 31 is previously embedded in the pilot holes 53 and 63, and then the joining tool 11 is brought into contact with either one of the cross laminated plates 51 and 61, and the fastening plate 27 and the reinforcing tool 41 is inserted and the connector 11 is fixed. Finally, the two cross plates 51, 61 are made to face each other, and the remaining fixtures 27 and reinforcements 41 are inserted.

  FIG. 2: shows the state which connected orthogonally laminated boards 51 and 61 of FIG. The connector 11 is sandwiched between the two cross laminations 51, 61 and attracts both. In addition, the load bearing shaft 31 is embedded in the middle lamina 54, 64, and the reinforcing tool 41 is inserted into the outside thereof. By using the load bearing shaft 31 and the reinforcing tool 41 in combination, the difference in strength due to the grain direction is cancelled. In addition, although the orthogonal lamination boards 51 and 61 of a figure are all 3 layer structure, in fact, it is often more layers. Even in that case, the contact plate 16 is brought into contact with one of the middle laminas 54 and 64 and the two side laminas 55 and 65 sandwiching it, and the bearing shaft 31 is placed on the middle laminas 54 and 64. Embed and insert the reinforcement 41 into the side lamina 55, 65.

  FIG. 3 shows a connection structure different from that of FIG. 1, and it is assumed that a rod-like cross-laminated plate 51 is used as a column and its lower part is installed on a foundation concrete 71. The cross-laminated plate 51 is upright and comprises a central middle lamina 54 and a pair of side laminas 55 sandwiching the middle lamina 54. The middle lamina 54 has two bearing shafts 31 embedded therein. Insert two reinforcements 42. The joint 12 shown in FIG. 3 is a column base and has a box shape in which the bottom plate 18 and the contact plate 16 are connected by two intermediate plates 17.

  The foundation concrete 71 rises from the ground and supports the building from the bottom, but four anchor bolts 72 project from the top to draw the connector 12 to the ground. The bottom plate 18 of the connector 12 is placed on the upper surface of the foundation concrete 71. In order to insert the anchor bolt 72 into the bottom plate 18, an anchor hole 25 is provided. The anchor hole 25 has a slightly enlarged inner diameter in order to absorb dimensional errors. When fixing the joint 12, firstly insert a washer 75 into the anchor bolt 72 and then screw in a nut 74.

  The load bearing shaft 31 used in FIG. 3 is a lag screw similar to that of FIG. 1 and is embedded in the lower hole 53 of the middle lamina 54. On the other hand, the reinforcing member 42 has a helically extending ridge 45, a hexagonal head 46 formed at one end thereof, and the male screw 47 further protrudes from the end, so that the connector 12 is orthogonal Before attaching to the laminated plate 51, it is inserted into the side lamina 55. When inserting the reinforcing tool 42, the fine holes 56 are formed in the side lamina 55 in advance, and the ridges 45 are made to bite into the inner circumferential surface of the fine holes 56. However, the male screw 47 and the head 46 are protruded to the lower surface of the side lamina 55 without being embedded in the fine holes 56.

  The contact plate 16 of the connector 12 receives the lower surface of the cross-laminated plate 51, but a center hole 24 is provided concentrically with the load bearing shaft 31 in the vicinity of the center, into which a fixing member 27 (bolt) is inserted. Then, the connector 12 is fixed to the cross plate 51. Further, at the four corners of the contact plate 16, side holes 23 are provided concentrically with the reinforcing member 42. The male screw 47 and the head portion 46 of the reinforcing member 42 are inserted into the side hole 23, but the male screw 47 protrudes below the side hole 23, and the joint member 12 is fixed by screwing a nut 48 thereto. The intermediate plate 17 secures a certain height in consideration of the fastening of the fixture 27 and the nuts 48 and 74.

  FIG. 4 shows the cross laminated plate 51 of FIG. 3 installed on a foundation concrete 71. The connector 12 is integrated with the cross-laminated plate 51 via the load-bearing shaft 31 and the reinforcing tool 42, and the connector 12 is pulled to the base concrete 71 via the anchor bolt 72, and the cross-laminated plate 51 is strong Is installed in Since the reinforcement 42 has a relatively small diameter, it can be disposed near the four corners of the cross-laminated plate 51, and the joint 12 and the cross-laminated plate 51 come into close contact without loosening.

  FIG. 5 shows a specific example of the joining tools 13 and 14 and the bearing shaft 32, and as in FIG. 1, two orthogonal cross plates 51 and 61 are connected in an L shape, but the cross cross plates 51 and 61 The angle of intersection can be adjusted, and it can also be used for mounting such as climbing beams and braces. Further, as the load bearing shaft 32, a deformed bar is used. The connectors 13 and 14 in FIG. 5 have a shape in which the clevis 22 protrudes from the surface of the contact plate 16, and the two are disposed to face each other, and both are integrated by the fulcrum pin 28. Although one connector 13 is attached to the side of the column and the other connector 14 is attached to the end face of the cross member, two clevis 22 are for the pillar side and clevis for the one on the cross member. 22 is one.

  A pin hole 29 is provided at the tip of the clevis 22. One clevis 22 of the connector 14 is sandwiched between the two clevis 22 of the connector 13 and a fulcrum so as to penetrate all the pin holes 29. When the pin 28 is inserted, the two connectors 13 and 14 are pivotably integrated about the fulcrum pin 28 so that the two members can be connected at any angle. In addition, the side plate 23 of a total of eight places is provided in the contact | abutting board 16 with all the joining tools 13 and 14, and the reinforcement 43 is inserted toward the side lamina 55, 65 from there. The reinforcement 43 in this figure has a hemispherical head and is tightened with a tool such as a screwdriver.

  The load-bearing shaft 32 is formed by cutting out a deformed bar steel having a rib 38 formed on the side circumferential surface to a predetermined length, and a female screw 37 for screwing a fixing tool 27 (bolt) is formed on one end surface thereof. is there. Further, the load bearing shaft 32 is embedded in the lower holes 53, 63 of the middle lamina 54, 64 and fixed with an adhesive 39. In this case, since the connectors 13 and 14 in this figure have the clevis 22 at the center, the hole 24 into which the fixing member 27 is inserted is located in the vicinity of the foot of the clevis 22. 32 is embedded in upper and lower two places. In addition, at the time of construction, the connectors 13 and 14 are attached to the respective orthogonal laminated plates 51 and 61 beforehand, and the fulcrum pin 28 is inserted on site.

  FIG. 6 shows a state in which the cross plates 51, 61 of FIG. 5 are connected. In the upper right of FIG. 6, an orthogonal laminated board 61 (horizontal mounting material) just before connection is drawn. The connectors 13, 14 are attached to the respective orthogonal assembly plates 51, 61, and the opposing connectors 13, 14 are integrated at the fulcrum pin 28. Therefore, it is possible to freely adjust the crossing angle between the orthogonal laminated plates 51, 61. In addition, the reinforcing members 43 are arranged without gaps in the upper and lower portions to increase the strength. In addition, the reinforcing member 43 has a relatively small diameter, and even when it is inserted near the surfaces of the cross laminated plates 51 and 61, no cracking occurs.

  FIG. 7 shows a specific example of the connector 15 and the reinforcing member 44. As shown in FIG. Here, a lag screw is used as the bearing shaft 31 embedded in the middle lamina 54, 64, and a lug screw having substantially the same shape as the bearing shaft 31 is used also for the reinforcing tool 44 embedded in the side lamina 55, 65. However, in order to prevent the cracks in the side lamina 55, 65, the reinforcing tool 44 has a round diameter and is embedded in the fine holes 56, 66 processed into the side lamina 55, 65. The inner diameter is enlarged near the entrances of the fine holes 56 and 66 in consideration of the embedding operation.

  As the connector 15, a U-shaped member composed of a pair of contact plates 16 in contact with the facing cross plates 51, 61 and an intermediate plate 17 connecting the two is used to secure rigidity. , Two are placed back to back. Each contact plate 16 is provided with a central hole 24 and a side hole 23, from which the fixing tool 27 is inserted toward the load bearing shaft 31 and the female screws 37 and 49 of the reinforcing tool 44. In the connector 15, the bores 24 and the side holes 23 are necessarily aligned in a horizontal line, and the reinforcing tool 44 is disposed so as to sandwich the bearing shaft 31.

  FIG. 8 shows a state in which the cross plates 51, 61 of FIG. 7 are connected to each other. Although it is difficult to obtain rigidity by itself in the connecting tool 15 in this figure, necessary rigidity is secured by arranging two pieces adjacent to each other. Each contact plate 16 is integrated with the middle lamina 54, 64 through the load-bearing shaft 31, and is also integrated with the side lamina 55, 65 through the reinforcing member 44. It is not necessary to consider the difference in intensity of the side lamina 55, 65.

  The form drawn in each figure so far shows an example of the connection structure according to the present invention, and the contact plate 16 is brought into contact with all of the middle lamina 54, 64 and the pair of side lamina 55, 65 If the shafts 31, 32 and the reinforcements 41, 42, 43, 44 are used in combination and the joints 11, 12, 13, 14, 15 are attached to the cross plates 51, 61, the other form is free. Therefore, the elements depicted in each figure can be appropriately selected, and these can be freely combined within a realistic range.

11 connector 12 connector (column base)
13 connectors (two cleviss)
14 Joiner (one clevis)
15 Joint (U-shaped)
16 contact plate 17 intermediate plate 18 bottom plate 22 clevis 23 side hole 24 middle hole 25 anchor hole 27 fixing tool (bolt)
28 fulcrum pin 29 pin hole 31 load bearing shaft (lag screw)
32 Load-bearing shaft (deformed bar)
35 convex line 36 head 37 female screw 38 rib 39 adhesive 41 reinforcing tool (hexagonal head)
42 Reinforcement (with male screw)
43 Reinforcement (Semispherical head)
44 Reinforcement (Lug screw)
45 ridge 46 head 47 male screw 48 nut (reinforcement and screwing)
49 female threads 51 Crossed laminated plate (column)
53 pilot hole 54 middle lamina 55 side lamina 56 fine hole 61 cross-laminated board (horizontal mounting material)
63 pilot hole 64 middle lamina 65 side lamina 66 fine hole 71 foundation concrete 72 anchor bolt 74 nut (engagement with anchor bolt)
75 washer (insert in anchor bolt)

Claims (1)

At least one of the two members to be connected is a connection structure using cross laminated boards (51, 61),
The cross laminated board (51, 61) is formed by bonding middle lamina (54, 64) and side lamina (55, 65) different in wood grain direction, and the middle lamina (54, 64) is a pair of the side lamina. (55, 65) is sandwiched,
Joints (11 to 15) sandwiched between two members to be connected, rod-like load-bearing shafts (31 to 32) embedded in the middle lamina (54, 64), and screws inserted in the side lamina (55, 65) Using nail-shaped reinforcements (41 to 44);
The connector (11 to 15) includes a contact plate (16) in contact with the surface of the cross plate (51, 61), the contact plate (16) being the middle lamina (54, 64) And any of the pair of the side laminas (55, 65) sandwiching it,
The load-bearing shaft (31 to 32) is fixed to the middle lamina (54, 64), and the connector (11 to 15) is attached to the load-bearing shaft (31 to 32) via a fastener (27) such as a bolt. Attracting,
The reinforcements (41 to 44) are inserted into the side lamina (55, 65) through the side holes (23) provided in the contact plate (16), and the connectors (11 to 15) are inserted into the side lamina Attract to (55, 65),
A connecting structure characterized in that at least one of the reinforcing members (41 to 44) is inserted into any of the pair of the side lamina (55, 65).

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