JP2026007881A - Column beam joint structure - Google Patents

Abstract

[Problem] To provide a column-beam joint structure in which a column and a wooden beam are joined, which has high joint strength and joint rigidity, including shear strength between the column joint and the wooden beam.
[Solution] A column-beam joint structure 100 in which a mating wooden beam 50A is joined to a concrete bracket 15 that protrudes from the side 11 of a joint 10A of a concrete column 10. The bracket 15 and a pair of wooden beams 50 are joined to each other with a fastener 70. An insert nut 20 with a female thread 22 is embedded in the joint 10A, and the female thread 22 faces the side 11 of the joint 10A. The wooden beam 50 has a box-shaped notch 55 and a through hole 56 that communicates with it and extends to the abutting end face 53 of the wooden beam 50 where it meets the joint 10A. One end 61 of a bolt 60 that is passed through the through hole 56 is threaded into the female thread 22, and the other end 62 of the bolt 60 is nut-tightened so as to press against the side 55a of the notch 55 inside the notch 55.
[Selected Figure] Figure 1

Description

The present invention relates to a column-beam joint structure.

In some building structures, reinforced concrete (RC), steel (S), steel-reinforced concrete (SRC), or even wooden columns are fitted with RC or S brackets extending from their sides. Wooden beams are then bolted to the brackets, and a RC, wooden, or steel deck is then placed on top of the wooden beams. For example, in addition to RC columns constructed on-site, there are also precast concrete (PCa) columns, which are factory-fabricated, transported to the site, and assembled on-site. The use of PCa columns significantly shortens construction time and creates high-quality beam-to-column joints. There are also various types of column and bracket configurations, including RC structures in which the columns and brackets are integrated, and structures with bracket-equipped joints between the upper and lower columns. Furthermore, there are various types of decks supported by wooden beams, including reinforced concrete decks constructed on-site, precast concrete decks, and wooden decks.

In this way, using wooden beams for the beams reduces the burden on the environment, and their light weight makes them easier to handle and install on site, while also providing the excellent exterior design that wood offers.

Patent Document 1 proposes a wooden beam joint structure. In this joint structure, a wooden beam is joined to a wooden column, with a concrete joint placed at the joint between the column and beam, and the column and beam are joined via the joint. One end of a lag screw bolt, which serves as a fastener for the core material, is screwed into the end of the beam, and the other end of the lag screw bolt is embedded and fixed in the concrete that forms the joint. Because the other end of the lag screw bolt is embedded in the concrete joint, the joint is constructed on-site by pouring concrete.

Japanese Patent Application Laid-Open No. 2020-101020

As described above, the column-beam joint structure described in Patent Document 1 is a column-to-beam joint structure in which the lag screw bolt protruding from the end of the wooden beam has the other end embedded in the concrete joint that forms the column. As a result, the shear resistance at the column-to-beam joint relies solely on the lag screw bolt, leaving room for improvement in the shear strength of the joint.

The present invention was made in consideration of the above-mentioned problems, and aims to provide a column-beam joint structure in which a column and a wooden beam are joined, with high joint strength and joint rigidity, such as shear strength, bending strength, and bending rigidity, between the column joint and the wooden beam.

In order to achieve the above object, one aspect of the column-beam joint structure according to the present invention is as follows:
A beam-column joint structure in which a pair of wooden beams are placed side by side with a gap between them and a concrete bracket protruding from the side of a concrete column joint,
The bracket and the pair of wooden beams are joined to each other by fasteners passing through them,
An insert nut with a female thread is embedded in the joint, and the female thread faces the side surface of the joint,
The wooden beam is provided with a box-shaped notch and an insertion hole that communicates with the notch and extends to the abutting end face of the wooden beam with the joint,
One end of a bolt passed through the insertion hole is threaded into the female thread, and the other end of the bolt is fastened with a nut inside the notch so as to press against the side of the notch.

In this configuration, concrete brackets projecting from the joints of the concrete columns are joined together with fasteners, sandwiching the gap between the overlapping wooden beams. Furthermore, one end of a bolt threaded through a through hole that connects to a box-shaped notch in the wooden beam and extends to the abutting end face is threaded into the female thread of an insert nut embedded in the joint, and the other end of the bolt is tightened with a nut. This is a so-called tension bolt structure, which creates a column-beam joint structure with high joint strength and joint rigidity, including shear strength, bending strength, and bending rigidity, between the joint and the wooden beam.

Another aspect of the column-beam joint structure according to the present invention is as follows:
the pillar is a precast concrete pillar,
The bracket is characterized in that it is made of precast concrete.

In this embodiment, the columns are made of precast concrete, and the brackets are also made of precast concrete, resulting in a column-beam joint structure with excellent workability and quality. In this embodiment, the entire precast concrete column, including the joint, the upper column above it, and the lower column below it, is made of precast concrete. For example, the precast concrete joint, lower column, and upper column are transported to the site and assembled there to form the precast concrete column. Furthermore, the precast concrete bracket may be assembled to the precast concrete joint at a factory and then transported to the site, or the precast concrete bracket may be assembled to the precast concrete joint at the site.

Another aspect of the column-beam joint structure according to the present invention is as follows:
At least one of the joint and the bracket in the column is a cast-in-place concrete body,
At least one of the upper pillar above the joint and the lower pillar below is a cast-in-place concrete body,
The member that is not a cast-in-place concrete body is a precast concrete member.

In this embodiment, at least one of the column joints and brackets is made of cast-in-place concrete, at least one of the upper column and lower column is made of cast-in-place concrete, and the components that are not cast-in-place concrete are precast concrete members, making it possible to form a variety of structural types of beam-column joint structures. This embodiment includes, for example, a configuration in which the entire column, including the joints, upper column, and lower column, is made of cast-in-place concrete, and the bracket is also made of cast-in-place concrete, a configuration in which the bracket is a precast concrete member, or a configuration in which the joints and brackets are precast concrete members and the upper column and lower column are cast-in-place concrete.

Another aspect of the column-beam joint structure according to the present invention is as follows:
A column-beam joint structure in which a pair of wooden beams are arranged side by side with a gap between them and a bracket made of shaped steel material protruding from the side of the joint of a concrete column,
The bracket is joined by embedding a portion thereof in the joint,
The bracket and the pair of wooden beams are joined to each other by fasteners passing through them,
An insert nut with a female thread is embedded in the joint, and the female thread faces the side surface of the joint,
The wooden beam is provided with a box-shaped notch and an insertion hole that communicates with the notch and extends to the abutting end face of the wooden beam with the joint,
One end of a bolt passed through the insertion hole is threaded into the female thread, and the other end of the bolt is fastened with a nut inside the notch so as to press against the side of the notch.

In this configuration, brackets made of shaped steel protruding from the joints of the concrete columns are joined together with fasteners, sandwiching the gap between the wooden beams. Furthermore, one end of a bolt threaded through a through hole that connects to a box-shaped notch in the wooden beam and extends to the abutting end face is screwed into the female thread of an insert nut embedded in the joint, and the other end of the bolt is tightened with a nut. This is a so-called tension bolt structure, which creates a column-beam joint structure with high joint strength and joint rigidity, including shear strength, bending strength, and bending rigidity, between the joint and the wooden beam.

Another aspect of the column-beam joint structure according to the present invention is as follows:
A column-beam joint structure in which a pair of wooden beams are arranged side by side with a gap between them and a bracket made of shaped steel material joined to the side of the joint of the wooden column,
The bracket and the pair of wooden beams are joined to each other by fasteners passing through them,
An end plate is attached to the end of the shaped steel material, the end plate abuts against a side surface of the joint, and the end plate is joined to the joint via a fastener inserted through a fastener hole opened in the end plate,
An insert nut with a female thread is embedded in the joint, and the female thread faces the side surface of the joint,
The wooden beam is provided with a box-shaped notch and a through hole that is connected to the notch and extends to the abutting end face of the wooden beam where the joint meets, and one end of a bolt passed through the through hole is threaded into the female thread, and the other end of the bolt is tightened with a nut inside the notch so as to press against the side of the notch.

In this configuration, brackets made of shaped steel are joined to the sides of the joints of the wooden columns, and fasteners are used to join the wooden beams together with the gap between them sandwiched between them. Furthermore, one end of a bolt is threaded into the female thread of an insert nut embedded in the joint. The bolt is inserted into an insertion hole that connects to a box-shaped notch in the wooden beam and extends to the abutting end face, and the other end of the bolt is tightened with a nut. This is a so-called tension bolt structure, and it creates a column-beam joint structure with high joint strength and joint rigidity, including shear strength, bending strength, and bending rigidity, between the joint and the wooden beam.

Another aspect of the column-beam joint structure according to the present invention is as follows:
The steel member is an H-shaped steel member.

In this embodiment, the structural steel material forming the bracket is an H-shaped steel, which allows for the creation of a column-beam connection structure with high joint strength and joint rigidity. Here, gusset plates with fastener holes are joined to the left and right sides of the H-shaped steel, and the H-shaped steel and wooden beam can be joined by aligning the fastener holes on both the wooden beam and the gusset plate and inserting fasteners.

Another aspect of the column-beam joint structure according to the present invention is as follows:
The fastener is one of a lag screw bolt, a drift pin, a wood screw, a nail, a bolt, and a glue-in rod.

In this embodiment, various fasteners, such as lag screw bolts and drift pins, can be used to join concrete blocks and wooden beams with high strength. Here, glue-in rods (GIRs) can also be called glued-in rods, and are a construction method (method) for joining wooden members by drilling holes in them, inserting steel rods into the holes, and filling them with resin adhesive. Fasteners include a combination of resin adhesive and steel rods.

As can be understood from the above explanation, the column-beam joint structure of the present invention can provide a column-beam joint structure in which a column and a wooden beam are joined, with high joint strength and joint rigidity, such as shear strength, bending strength, and bending rigidity, between the column joint and the wooden beam.

1 is a perspective view of an example of a beam-column joint structure according to a first embodiment; This is an exploded oblique view of a column equipped with a bracket and a pair of wooden beams forming a laminated wooden beam, which form an example of a column-beam joint structure related to the first embodiment. 3 is a view taken along the line III-III in FIG. 1, and is a longitudinal cross-sectional view of the wooden beam cut at a midpoint. FIG. 4 is a diagram corresponding to FIG. 3 and is a vertical cross-sectional view of another example of the column-beam joint structure according to the first embodiment. FIG. 10 is a perspective view of an example of a beam-column joint structure according to a second embodiment. This is an exploded oblique view of a column equipped with a bracket and a pair of wooden beams forming a laminated wooden beam, which form an example of a column-beam joint structure related to the second embodiment. 7 is a view taken along the arrow VII-VII in FIG. 5, and is a vertical cross-sectional view showing the wooden beam cut at a midpoint. FIG. 8 is a diagram corresponding to FIG. 7 and is a vertical cross-sectional view of another example of a column-beam joint structure according to the second embodiment. FIG. 11 is a perspective view of an example of a beam-column joint structure according to a third embodiment. This is an exploded oblique view of a column equipped with a bracket and a pair of wooden beams forming a laminated wooden beam, which form an example of a column-beam joint structure related to the third embodiment. 10 is a view taken along the arrows XI-XI in FIG. 9, and is a longitudinal cross-sectional view showing the wooden beam cut at a midpoint. FIG. 12 is a diagram corresponding to FIG. 11 and is a vertical cross-sectional view of another example of a column-beam joint structure according to the third embodiment.

An example of a beam-column joint structure according to each embodiment will be described below with reference to the accompanying drawings. Note that in this specification and drawings, substantially identical components will be designated by the same reference numerals, and redundant explanations may be omitted.

[Column-beam joint structure according to the first embodiment]
First, an example of a column-beam joint structure according to the first embodiment will be described with reference to FIGS. 1 to 4. Here, FIG. 1 is a perspective view of an example of a column-beam joint structure according to the first embodiment. Also, FIG. 2 is an exploded perspective view of a column equipped with a bracket and a pair of wooden beams forming a laminated wooden beam, which form an example of a column-beam joint structure according to the first embodiment. FIG. 3 is a view taken along arrows III-III in FIG. 1, showing a longitudinal cross-section cut at a midpoint of the wooden beam. Furthermore, FIG. 4 is a view corresponding to FIG. 3, showing a longitudinal cross-section of another example of a column-beam joint structure according to the first embodiment. Hereinafter, in each perspective view, illustrations of main reinforcement bars, ties, etc. of the column 10 are omitted.

The beam-column joint structure 100 shown in Figure 1 is formed by joining a pair of wooden beams 50 arranged side by side with a gap G between them to a concrete bracket 15 that protrudes from the side surface 11 of the joint 10A of a concrete column 10, and the pair of wooden beams 50 are also joined to the joint 10A.

The pillar 10 consists of a joint 10A and upper and lower pillars 10B and 10C, which are one-piece reinforced concrete structures. They are either PCa pillars (precast concrete pillars) manufactured in a factory and transported to the site, or PCa pillars manufactured on-site (so-called site PCa). The PCa pillar 10 may also be a steel-reinforced concrete pillar or a concrete-filled steel tube (CFT) pillar. The PCa pillar may also have a woodblock affixed to the surface of the concrete.

In the illustrated example, the bracket 15 extending laterally from the side surface 11 of the joint 10A is also made of precast concrete (precast concrete bracket), and the joint 10A and bracket 15 are manufactured as a single unit at the factory.

Here, either or both of the joint 10A and the bracket 15 may be made of cast-in-place concrete. Also, either or both of the upper column 10B and the lower column 10C may be made of cast-in-place concrete.

As shown in Figure 2, multiple insert nuts 17 are embedded in the left and right side surfaces 16 of the bracket 15, with end openings facing the sides.

The wooden beam 50 is formed by stacking a large number of sawn boards with their grain directions alternately perpendicular to one another and then gluing them together. Here, the wooden beam 50 may be made of materials other than a stack of sawn boards, such as cross-laminated timber (CLT) or laminated veneer lumber (LVL).

The wooden beam 50 has multiple bolt holes 59 that penetrate a pair of side surfaces, and countersunk grooves 58 are provided in the outer side surface 54 at positions corresponding to the bolt holes 59.

When the wooden beam 50 is aligned with the side surface 16 of the bracket 15, the multiple insert nuts 17 and bolt holes 59 on both sides are interconnected.

A bolt 70 (an example of a fastener) is inserted into the bolt hole 59, the tip of the bolt 70 is threaded into the insert nut 17, a washer 71 is fitted onto the bolt 70 in the countersunk groove 58, and the bolt is then tightened with a nut 72, thereby joining the wooden beam 50 to the bracket 15.

As shown in Figures 1 to 3, the wooden beam 50 further has box-shaped cutouts 55 on its upper surface 51 and lower surface 52, and each cutout 55 has an insertion hole 56 that extends to the abutting end surface 53 with the side surface 11 of the joint 10A.

As shown in Figures 2 and 3, one end 61 of the bolt 60 passed through the insertion hole 56 is threaded into the female thread 22, and the other end 62 of the bolt 60 is tightened by a nut 66 via a washer 65 so as to press against the side surface 55a of the notch 55 inside the notch 55.

In the illustrated example of the beam-column joint structure 100, one end 61 of two bolts 60 inserted into insertion holes 56 that communicate with two notches 55 at the top and bottom of the wooden beam 50 is threaded into the female threads 22 of the insert nuts 20 embedded in the joint 10A, thereby joining the joint 10A and the wooden beam 50 using a tension bolt structure.

As shown in Figure 3, inside the joint 10A, one end of the anchor bar 30 is fixed by screwing or welding to the female thread 22 of the insert nut 20, and an anchor plate 40 is attached to the other end. In other words, the predetermined length of the anchor bar 30 and the anchor plate 40 secure the insert nut 20, which threads onto one end 61 of the bolt 60 of the wooden beam 50, to the joint 10A. Note that even if the anchor bar 30 alone does not have a sufficient anchor length, the presence of the anchor plate 40 ensures that the insert nut 20 is sufficiently secured to the joint 10A.

The bolt 60 used here has threads at one end 61 and the other end 62 that thread onto the female thread 22 and nut 66, with the general portion between them being unthreaded. In this configuration, by making the diameter of the unthreaded general portion smaller than the diameter of the threaded ends 61 and 62 (making the strength of the general portion relatively small) when the frame deforms during an earthquake and a tensile force acts on the bolt 60, the entire general portion of the bolt 60 will yield first, allowing for effective absorption of seismic energy, which is preferable. Furthermore, even when low-yield-point steel with excellent plastic deformation capacity is used for the bolt 60, the same effect of excellent seismic energy absorption can be achieved.

To outline the construction method for a beam-column joint structure on-site, first, the column 10 and bracket 15, which are entirely made of precast concrete, are transported to the site, and the column 10 is erected.

Next, one end 61 of the bolt 60 passed through the insertion hole 56 of the wooden beam 50 is threaded into the female thread 22 of the insert nut 20 facing the side surface 11 of the joint 10A, and the other end 62 of the bolt 60 is tightened with a nut 66 so as to press against the side surface 55a of the notch 55 inside the notch 55. Next, bolts 70 are inserted into each bolt hole 59 on the side surface 54 of the wooden beam 50, and the tip of the bolt 70 is threaded into the insert nut 17 of the bracket 15. After that, the head of the bolt 70 is tightened with a nut 72 in the countersunk groove 58, completing the beam-column joint structure 100.

The column-beam joint structure 100 shown in Figure 1 is a structure in which the abutting end surface 53 of a wooden beam 50 is joined to one column 10. However, in a building frame, a pair of columns 10 are erected with a specified span between them, and the abutting end surfaces 53 at both ends of a wooden beam 50 (suspended, for example, by a crane) are abutted against the joints 10A of both columns 10. One end 61 of a bolt 60 is threaded into the female threads 22 of each insert nut 20, and the other end 62 is tightened with a nut 66 inside the notch 55. Furthermore, bolts 70 are inserted into each bolt hole 59 on the side surface 54 of the wooden beam 50, and the tip of the bolt 70 is threaded into the insert nut 17 of the bracket 15. The head of the bolt 70 is then tightened with a nut 72 in the countersunk groove 58. This completes the simultaneous or sequential formation of two column-beam joint structures 100.

In the beam-column joint structure 100, a concrete bracket 15 protruding from the joint 10A of the concrete column 10 is sandwiched between the gap G of the mating wooden beam 50A and fasteners 70 to join the bracket 15 and the mating wooden beam 50A. Furthermore, one end 61 of a bolt 60 threaded through a through-hole 56 that connects to a box-shaped notch 55 in the wooden beam 50 and extends to the abutting end face 53 is threaded into the female thread 22 of an insert nut 20 embedded in the joint 10A, and the other end 62 of the bolt 60 is tightened with a nut 66. This so-called tension bolt structure creates a beam-column joint structure with high joint strength and rigidity, including shear strength, bending strength, and bending rigidity, between the joint 10A and the wooden beam 50.

A deck (not shown) is placed on the upper surface 51 of the wooden beam 50 that forms the beam-column joint structure 100. This deck can take a variety of forms, including PCa decks (PCa reinforced concrete decks, PCa prestressed concrete decks (PC decks)), PC composite decks made of half PCa decks and on-site constructed decks, and ALC (Autoclaved Lightweight Aerated Concrete) panels.

On the other hand, the modified column-beam joint structure 100A shown in Figure 4 has brackets 15 (not shown in Figure 4) attached to a pair of opposing side surfaces 11 of the joint 10A of the square column 10, and wooden beams 50 forming a pair of laminated wooden beams 50A are joined to each bracket 15 and each side surface 11.

Multiple insert nuts 20 (two, one on top and one on bottom, are shown in the illustration) are embedded in corresponding positions on a pair of opposing side surfaces 11 of the joint 10A of the pillar 10, with the female threads 22 facing out, and a pair of wooden beams 50 are joined to each insert nut 20 via bolts 60.

In the beam-column joint structure 100A, both ends of the anchor bars 30 that pass through the joint 10A are fastened to a corresponding pair of insert nuts 20 by screwing or welding, thereby joining the two together.

Although not shown, a unique bracket 15 may also be attached to one or both of the remaining opposing side surfaces 11 of the joint 10A of the rectangular pillar 10, with a unique interlocking wooden beam 50A joined to the side surface 11 corresponding to each bracket 15. In this configuration, the height positions of the intersecting anchor bars 30 and their associated insert nuts 20 are offset from one another so that the intersecting anchor bars 30 do not interfere with each other inside the joint 10A.

[Column-beam joint structure according to the second embodiment]
Next, an example of a column-beam joint structure according to the second embodiment will be described with reference to Figs. 5 to 8. Fig. 5 is a perspective view of an example of a column-beam joint structure according to the second embodiment. Fig. 6 is an exploded perspective view of a column equipped with a bracket and a pair of wooden beams forming a laminated wooden beam, which form an example of a column-beam joint structure according to the second embodiment. Fig. 7 is a view taken along arrows VII-VII in Fig. 5, and is a longitudinal cross-sectional view cut at a midpoint of the wooden beam. Fig. 8 is a view corresponding to Fig. 7, and is a longitudinal cross-sectional view of another example of a column-beam joint structure according to the second embodiment.

The illustrated beam-column connection structure 100B differs from the beam-column connection structure 100 in that it has a bracket 80 made of an H-shaped steel (an example of a shaped steel material), with a portion of the H-shaped steel 80 overhanging the side surface 11 of the joint 10A and the remaining portion of the H-shaped steel 80 embedded in the joint 10A. Here, the illustrated example shows a configuration in which a bracket 80 overhangs one side surface 11 of the joint 10A and another bracket 80 overhangs from another adjacent side surface, and a laminated wooden beam 50A (not shown) is also joined to the other bracket 80.

As shown in Figures 5 and 6, gusset plates 85 (or cover plates) are fitted into the upper flange 82 and lower flange 83 of the H-shaped steel 80, and the gusset plates 85, which are parallel to the web 81, are welded to the upper flange 82 and lower flange 83.

When the wooden beam 50 is abutted against the gusset plate 85 and aligned, the corresponding bolt holes 59, 86 communicate with each other, and the bolt 70 is threaded into these bolt holes 59, 86. The bolt 70 is then tightened with the nut 72 via the washer 71 in the countersunk groove 58, joining the bracket 80 and the wooden beam 50. The connection between the wooden beam 50 and the joint 10A is similar to that of the beam-column connection structure 100, so a description thereof will be omitted.

In the beam-column joint structure 100B, a bracket 80 made of shaped steel protruding from the joint 10A of the concrete column 10 is sandwiched between the gap G of the mating wooden beam 50A and fasteners 70 to join the bracket 80 and the mating wooden beam 50A. Furthermore, one end 61 of a bolt 60 threaded through a through hole 56 that connects to a box-shaped notch 55 in the wooden beam 50 and extends to the abutting end face 53 is threaded into the female thread 22 of an insert nut 20 embedded in the joint 10A, and the other end 62 of the bolt 60 is tightened with a nut 66. This so-called tension bolt structure creates a beam-column joint structure with high joint strength and rigidity, including shear strength, bending strength, and bending rigidity, between the joint 10A and the wooden beam 50.

On the other hand, the modified column-beam joint structure 100C shown in Figure 8 has brackets 80 (not shown in Figure 4) attached to a pair of opposing side surfaces 11 of the joint 10A of a square pillar-shaped column 10, and wooden beams 50 forming a pair of interlocking wooden beams 50A are joined to each bracket 80 and each side surface 11.

For example, a long bracket 80 can be arranged to penetrate a pair of side surfaces 11, and its central region can be embedded in the joint 10A, allowing the bracket 80 to protrude from the pair of side surfaces 11.

Furthermore, for example, the upper flanges of brackets 80 projecting from another pair of side surfaces 11 are welded to this bracket 80, and the lower flanges are welded to each other, and another bracket 80 projects from the other pair of side surfaces 11, thereby forming a column-beam joint structure 100C in which a unique bracket 80 projects from each of the four side surfaces 11 of the joint 10A of the square pillar 10, and a unique laminated wooden beam 50A is joined to each bracket 80 and each side surface 11. Note that in Figure 8, the laminated wooden beam 50A joined to the bracket 80 in the center of the page is not shown in order to make the cross-sectional structure easier to visualize.

[Column-beam joint structure according to the third embodiment]
Next, an example of a column-beam joint structure according to the third embodiment will be described with reference to Figs. 9 to 12. Fig. 9 is a perspective view of an example of a column-beam joint structure according to the third embodiment. Fig. 10 is an exploded perspective view of a column equipped with a bracket and a pair of wooden beams forming a laminated wooden beam, which form an example of a column-beam joint structure according to the third embodiment. Fig. 11 is a view taken along arrows XI-XI in Fig. 9, showing a longitudinal cross-section cut at a midpoint of the wooden beam. Fig. 12 is a view corresponding to Fig. 11 and showing a longitudinal cross-section of another example of a column-beam joint structure according to the third embodiment.

The illustrated beam-column connection structure 100D differs from beam-column connection structures 100 and 100B in that a bracket 80 made of an H-shaped steel (an example of a shaped steel material) is joined to the side surface 91 of a wooden column 90. Although not shown, a bracket made of reinforced concrete may also be used instead of the bracket 80 made of an H-shaped steel.

The wooden pillar 90 is formed by arranging multiple laminated boards (three in the illustrated example) similar to the wooden beam 50 side by side and joining them together by gluing or fastening with fasteners.

As shown in Figures 9 to 11, a steel end plate 87 is welded to the end of the H-beam 80, and screws 88 (an example of a fastener) are driven into the side surface 91 of the wooden pillar 90 through fastener holes (not shown) that are opened near each corner of the rectangular end plate 87 in a plan view, thereby joining the wooden pillar 90 and the bracket 80.

The end plate 87 also has a bolt hole 89 at a position corresponding to the insertion hole 56 of the wooden beam 50, through which the bolt 60 is inserted.

As shown in Figure 11, a lag screw bolt 25 (another example of an insert nut) with a male thread 26 on the outer periphery and a female thread 27 on the inside is embedded and threaded inside the wooden pillar 90, with the end of the female thread 27 facing a position on the side surface 91 that corresponds to the bolt hole 89 in the end plate 87.

One end 61 of a bolt 60, which is passed through a through-hole 56 that communicates with the box-shaped notch 55 in the wooden beam 50 and extends to the abutting end face 53, threads into the female thread 27 of the lag screw bolt 25, and the other end 62 of the bolt 60 is tightened with a nut 66, joining the wooden column 90 and wooden beam 50. The connection between the wooden beam 50 and bracket 80 is similar to that in the column-beam connection structure 100B, so a description thereof will be omitted.

In the beam-column joint structure 100D, a bracket 80 made of shaped steel protruding from the side surface 91 of the wooden column 90 is joined to the wooden beam 50A with a fastener 70 sandwiching the gap G between them. Furthermore, one end 61 of a bolt 60 is threaded into the female thread 27 of a lag screw bolt 25 embedded in the joint 10A. The bolt 60 is inserted through a through hole 56 that connects to a box-shaped notch 55 in the wooden beam 50 and extends to the abutting end surface 53. The other end 62 of the bolt 60 is tightened with a nut 66. This so-called tension bolt structure creates a beam-column joint structure with high joint strength and rigidity, including shear strength, bending strength, and bending rigidity, between the joint 10A and the wooden beam 50.

On the other hand, the modified beam-column joint structure 100E shown in Figure 12 has brackets 80 (not shown in Figure 4) attached to a pair of opposing side surfaces 91 of a rectangular pillar-shaped pillar 90 via end plates 87, and wooden beams 50 forming a pair of laminated wooden beams 50A are joined to each bracket 80 and each side surface 91.

Although not shown, a unique bracket 80 may also be attached via an end plate 87 to one or both of the remaining pair of opposing side surfaces 91 of the rectangular pillar 90, with a unique laminated wooden beam 50A joined to the side surface 91 corresponding to each bracket 80. In this configuration, the height positions of the intersecting lag screw bolts 25 inside the pillar 90 are offset from each other so that they do not interfere with each other.

Other embodiments may be possible in which other components are combined with the configurations described in the above embodiments, and the present invention is in no way limited to the configurations shown here. In this regard, changes can be made without departing from the spirit of the present invention, and can be determined appropriately depending on the application form.

10: Pillars (concrete pillars, precast concrete pillars)
10A: Joint 10B: Upper pillar 10C: Lower pillar 11: Side 15: Bracket (concrete bracket, precast concrete bracket)
16: Side 17: Insert nut 18: Main reinforcement 19: Hoop reinforcement 20: Insert nut 22: Female thread 25: Insert nut (lag screw bolt)
26: Male screw 27: Female screw 30: Fixing bar 40: Fixing plate 50: Wooden beam 50A: Laminated wooden beam 51: Upper surface 52: Lower surface 53: Contact end surface 54: Side surface 55: Notch (box-shaped notch)
55a: Side surface 56: Insertion hole 58: Seat groove
59: Bolt hole 60: Bolt 61: One end 62: Other end 65: Washer 66: Nut 70: Bolt 71: Washer 72: Nut 80: Bracket (shaped steel, H-shaped steel)
81: Web 82: Upper flange 83: Lower flange 85: Gusset plate 86: Bolt hole 87: End plate 88: Screw (fastener)
89: Bolt hole 90: Pillar (wooden pillar)
91: Side 100, 100A, 100B, 100C, 100D, 100E: Column-beam joint structure G: Gap

Claims (7)

A beam-column joint structure in which a pair of wooden beams are placed side by side with a gap between them and a concrete bracket protruding from the side of a concrete column joint,
The bracket and the pair of wooden beams are joined to each other by fasteners passing through them,
An insert nut with a female thread is embedded in the joint, and the female thread faces the side surface of the joint,
The wooden beam is provided with a box-shaped notch and an insertion hole that communicates with the notch and extends to the abutting end face of the wooden beam with the joint,
A column-beam joint structure characterized in that one end of a bolt passed through the insertion hole is threaded into the female thread, and the other end of the bolt is tightened with a nut inside the notch so as to press against the side of the notch. the column is a precast concrete column;
The beam-column joint structure according to claim 1, wherein the bracket is a precast concrete bracket. At least one of the joint and the bracket in the column is a cast-in-place concrete body,
At least one of the upper pillar above the joint and the lower pillar below is a cast-in-place concrete body,
2. The beam-column joint structure according to claim 1, wherein the member that is not a cast-in-place concrete body is a precast concrete member. A column-beam joint structure in which a pair of wooden beams are arranged side by side with a gap between them and a bracket made of shaped steel material protruding from the side of the joint of a concrete column,
The bracket is joined by embedding a portion thereof in the joint,
The bracket and the pair of wooden beams are joined to each other by fasteners passing through them,
An insert nut with a female thread is embedded in the joint, and the female thread faces the side surface of the joint,
The wooden beam is provided with a box-shaped notch and an insertion hole that communicates with the notch and extends to the abutting end face of the wooden beam with the joint,
A column-beam joint structure characterized in that one end of a bolt passed through the insertion hole is threaded into the female thread, and the other end of the bolt is tightened with a nut inside the notch so as to press against the side of the notch. A column-beam joint structure in which a pair of wooden beams are arranged side by side with a gap between them and a bracket made of shaped steel material joined to the side of the joint of the wooden column,
The bracket and the pair of wooden beams are joined to each other by fasteners passing through them,
An end plate is attached to the end of the shaped steel material, the end plate abuts against a side surface of the joint, and the end plate is joined to the joint via a fastener inserted through a fastener hole opened in the end plate,
An insert nut with a female thread is embedded in the joint, and the female thread faces the side surface of the joint,
A column-beam joint structure characterized in that the wooden beam is provided with a box-shaped notch and a through hole that communicates with the notch and extends to the abutting end face of the wooden beam with the joint, one end of a bolt passed through the through hole is threaded into the female thread, and the other end of the bolt is tightened with a nut inside the notch so as to press against the side of the notch. The beam-column joint structure described in claim 4 or 5, characterized in that the steel section is an H-shaped steel. A beam-column joint structure as described in any one of claims 1, 4, and 5, characterized in that the fastener is one of a lag screw bolt, drift pin, wood screw, nail, bolt, or glue-in rod.