JP7064431B2 - Wooden beam joint structure - Google Patents

Description

The present invention relates to a wooden beam joining structure for joining a structure and a wooden beam, and is particularly suitable for joining a wooden beam to a concrete column of a concrete unit including a concrete column, a beam, or a slab. Regarding beam joint structure.

Conventionally, in a building constructed by joining a wooden beam to a structure such as a column, a wall, or a beam, the structure and the wooden beam are usually joined by a drift pin method using a metal joint. In the drift pin method, one end of the metal joint is fixed to the side surface of the structure, and the other end of the metal joint is inserted into a groove formed in the end surface of the joint of the wooden beam, and the side surface of the joint of the wooden beam is inserted. This is a method of rigidly joining a structure and a wooden beam by driving a drift pin into a drift pin hole formed through the other end of the metal joint and fixing the other end of the metal joint to the wooden beam. ..

FIG. 9A is a schematic side view showing a joint portion of a wooden beam fixed to each other by a drift pin method and a metal joint. As shown in FIG. 9A, a drift pin hole 101 into which the drift pin 300 is driven is formed on the side surface of the joint portion 100 of the wooden beam. By driving the drift pin 300 into the drift pin hole 101, inserting the tip of the drift pin 300, and penetrating the tip of the drift pin 300 into the drift pin hole (not shown) of the metal joint 200, the joint portion 100 of the wooden beam is formed. The metal joint 200 is fixed.

In a building where wooden beams are joined to the structure by the drift pin method, the structure vibrates in the horizontal direction due to the horizontal vibration of the earthquake during an earthquake. At this time, since the metal joint fixed to the structure rotates relative to the joint portion of the wooden beam, a bending moment M is generated at the joint portion of the wooden beam. As a result, as shown in FIG. 9B, the drift pin 300 driven into the drift pin hole 101 of the joint portion 100 of the wooden beam rotates and moves together with the rotating joint metal fitting 200 to move the side wall of the drift pin hole 101. The drift pin hole 101 may be deformed or damaged by being sunk into the hole.

When the drift pin hole at the joint of the wooden beam is deformed or damaged, there arises a problem that the coupling force and the moment resistance force between the structure and the wooden beam due to the drift pin are reduced. In this case, the building may collapse due to a subsequent aftershock or mainshock. In addition, the outer circumference of the core material of the wooden beam is usually covered with a fireproof material, but if the drift pin hole at the joint of the wooden beam is deformed or damaged, the drift pin hole will be deformed if a fire breaks out after the earthquake. Alternatively, there is a risk of fire spreading to the core material of the wooden beam from the gap in the damaged part.

In response to such problems related to building deformation during an earthquake, the first shaft assembly and the second shaft assembly are joined by one first pin and at least one second pin, and the vibration causes the above-mentioned problems. A vibration-damping joint structure between shaft braids configured such that the second pin breaks prior to the first pin and both shaft braids undergo relative rotational displacement with respect to the first pin due to the breakage. Has been proposed (Patent Document 1). In the prior art of Patent Document 1, when the second pin is broken due to the vibration caused by an earthquake, the double-screw assembly is displaced relative to the axis of one first pin, so that the collapse due to a large deformation of the building is suppressed. It is supposed to be.

Japanese Unexamined Patent Publication No. 2007-92417

However, the prior art of Patent Document 1 described above can prevent a bending moment from being generated at the joint portion of a wooden beam in one horizontal direction when the building vibrates in two horizontal directions at the time of an earthquake. However, in the other horizontal direction, there is a problem that it is not possible to prevent a bending moment from being generated at the joint portion of the wooden beam. Further, in the above-mentioned prior art of Patent Document 1, since the second pin is made to break prior to the first pin due to vibration, it is not possible to prevent the deformation or damage of the drift pin hole.

The present invention has been made in view of such a background, and an object of the present invention is to provide a wooden beam joint structure in which a bending moment is not generated at a joint portion of a wooden beam at the time of an earthquake.

In order to solve the above problems, one aspect of the present invention is a wooden beam joining structure (6) that joins a structure (3) and a wooden beam (4), and is one of the structure and the wooden beam. Between the first joining member (11) rigidly joined to the structure, the second joining member (12) rigidly joined to the other of the structure and the wooden beam, and the first joining member and the second joining member. A wooden joining metal fitting (10) including the first joining member and the third joining member (13) connecting the first joining member is provided, and the third joining member is attached to the first joining member. , Rotiably connected around the first virtual axis (L1) extending in the axial direction of the wooden beam, and connected to the second joining member in a direction perpendicular to the axial direction of the wooden beam. It is characterized in that it is configured to be rotatably connected around a second virtual axis (L2) extending.

According to this configuration, when the structure of the building vibrates in two horizontal directions during an earthquake, the metal joint for wood that joins the wooden beam to the structure of the building is centered on the first virtual axis and the second virtual axis. By rotating in two horizontal directions, it is possible to follow the vibration of the structure in two horizontal directions. This makes it possible to prevent a bending moment from being generated at the joint of the wooden beam during an earthquake.

Further, in one aspect of the present invention, in the above configuration, one of the first joining member and the third joining member projects toward the other along the first virtual axis. It has a pin portion (13c), the other of the two members has a shaft support portion (11b) capable of pivotally supporting the protruding pin portion, and one of the two members has the protruding pin portion and the shaft support portion. It is characterized in that it is rotatably connected to the other of the two members.

According to this configuration, it is possible to realize a rotatable connection centering on the first virtual axis to the first joint member of the third joint member with a simple configuration.

Further, in one aspect of the present invention, in the above configuration, the second joining member has a first connecting pin hole (12d) penetrating the member along the second virtual axis, and the third joining member. Has a second connecting pin hole (13d) that penetrates the member along the second virtual axis, and the third joining member is inserted into the first connecting pin hole and the second connecting pin hole. It is characterized in that it is rotatably connected to the second joining member via the connecting pin (17).

According to this configuration, it is possible to realize a rotatable connection centering on the second virtual axis to the second joint member of the third joint member with a simple configuration.

Further, in one aspect of the present invention, in the above configuration, the second joining member has a connecting end portion (12b) extending toward the third joining member and having the first connecting pin hole formed therein. The third joining member has a pair of flat plate portions (13a, 13a) extending toward the second joining member and having the second connecting pin hole formed therein, and the pair of flat plate portions has a pair of flat plate portions. It is characterized in that the connecting end portions of the second joining member are arranged so as to be separated from each other in the horizontal direction and opposed to each other so that the connecting end portions of the second joining member can be inserted between the flat plate portions.

According to this configuration, since the third joining member is connected to the second joining member via the pair of flat plate portions, it is possible to increase the connecting force of the third joining member between the second joining members.

Further, one aspect of the present invention is characterized in that, in the above configuration, at least a fireproof cover member (20) that covers the periphery of the third joining member is further provided.

According to this configuration, the fire resistance around the joint portion of the wooden beam can be improved and the appearance can be improved.

Further, one aspect of the present invention is characterized in that, in the above configuration, a fireproof sealing material (30) for sealing a gap between the fireproof cover member and the structure is further provided.

According to this configuration, since the gap between the fireproof cover member and the structure can be sealed, the fireproof performance around the joint portion of the wooden beam is further improved.

Further, one aspect of the present invention is characterized in that, in the above configuration, the structure is a concrete column of a concrete unit (A) including a concrete column (3), a beam, or a slab (2). And.

According to this configuration, the wooden beam joint structure of the present invention can be applied to a building composed of a concrete unit (concrete frame).

As described above, according to the present invention, it is possible to provide a wooden beam joint structure in which a bending moment is not generated at the joint portion of the wooden beam when the building vibrates in two horizontal directions at the time of an earthquake.

Schematic side view of a multi-story building to which the wooden beam joint structure of the present invention is applied Side view of the wooden beam joint structure of the present invention Plan view of the wooden beam joint structure of the present invention An exploded perspective view of a metal joint for wood constituting the wooden beam joint structure of the present invention. (A) Schematic side view showing the normal state of the multilayer structure of FIG. 1, (B) Schematic side view showing the state of the multilayer structure of FIG. 1 at the time of an earthquake. A plan view corresponding to FIG. 3 of the first modification of the wooden beam joining structure of the present invention. The plan view corresponding to FIG. 3 of the 2nd modification of the wooden beam joint structure of this invention. The plan view corresponding to FIG. 3 of the 3rd modification of the wooden beam joint structure of this invention. (A) Schematic side view showing the joints of wooden beams fixed to each other by the drift pin method and the metal joints, (B) The drift pins sank into the side walls of the drift pin holes in the joints of the wooden beams during an earthquake. Schematic side view showing the situation

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, concrete columns are assumed as the target structure for joining wooden beams using the wooden beam joining structure of the present invention. The structure to which the wooden beams are joined is not limited to concrete columns, but may be concrete walls or beams, steel columns or beams, wooden columns or beams, or the like.

FIG. 1 is a schematic side view of a multi-story building to which the wooden beam joint structure of the present invention is applied. As shown in FIG. 1, the multi-layer building 1 is composed of a concrete unit A and a wooden unit B arranged in the concrete unit A.

The concrete unit A is composed of a concrete slab 2 and a concrete pillar 3 and constitutes a grid-like concrete frame. The concrete unit A may further include a concrete beam. In the example of FIG. 1, each concrete unit A is composed of two slabs 2 and 2 which are floor side slabs and ceiling side slabs, and two pillars 3 and 3 which face each other, and the two slabs 2 and 2 are. It is supported substantially in parallel by two pillars 3, 3. The concrete slab 2 and the concrete column 3 are composed of, for example, reinforced concrete (RC) or steel-framed reinforced concrete (SRC).

By arranging the concrete units A in the horizontal direction and the vertical direction, the multi-story building 1 is constructed. In the example of FIG. 1, the concrete unit A is vertically stacked in two layers to form a two-layer multi-layer building 1, but the multi-layer building 1 may be one layer. , Or may have three or more layers.

The wooden unit B includes a wooden beam 4 and a wooden pillar 5. In the example of FIG. 1, each wooden unit B includes two wooden beams 4 and one wooden pillar 5. One end of the wooden beam 4 is joined to the side surface of the concrete pillar 3 of the concrete unit A, and the other end is joined to the side surface of the wooden pillar 5 erected on the floor side slab 2 of the concrete unit A. Ru. As a result, the wooden beam 4 is arranged between the floor side slab 2 and the ceiling side slab 2 of the concrete structure unit A substantially in parallel with the slabs 2 and 2. The wooden beam 4 and the wooden pillar 5 are made of, for example, laminated lumber or veneer laminated lumber, and the outer periphery thereof is fire-resistant coated with a burn-off layer, a burn allowance layer, or the like.

Then, although not shown, a wooden floor-side slab is arranged on the wooden beam 4 to construct a two-layer wooden structure (wooden space) in the concrete unit A. In the example of FIG. 1, the wooden unit B constructs a two-layer wooden structure, but the present invention is not limited to this, and a three-layer or more wooden structure may be constructed. Further, in the example of FIG. 1, the wooden pillar 5 extends from the floor side slab 2 of the concrete unit A to the ceiling side slab 2, but if the wooden beam 4 can be supported, it extends to the ceiling side slab 2. It does not have to be.

In such a multi-story building 1, since the wooden unit B is supported by the concrete unit A in which the wooden unit B is arranged, the wooden beam 4 of the wooden unit B supports only the wooden structure constructed by the wooden unit B. do it. Therefore, even when the building is configured in multiple layers, each wooden unit B has high earthquake resistance. Further, by forming the fire prevention section with the concrete unit A, the effect of preventing the spread of fire can be expected. In addition, since the multi-story building 1 shown in FIG. 1 uses the wooden unit B, it contributes to the promotion of the use of wood as a building material for the purpose of regenerating forests and forestry and considering the environment. be able to.

Next, in the above-mentioned multi-layer building 1, the wooden beam joining structure 6 of the present invention for joining the wooden beam 4 to the concrete pillar 3 will be described. FIG. 2 is a side view of the wooden beam joining structure 6, FIG. 3 is a plan view of the wooden beam joining structure 6, and FIG. 4 is an exploded perspective of the timber joining metal fitting 10 constituting the wooden beam joining structure 6. It is a figure. In the following, a case where the wooden beam 4 is joined to the concrete pillar 3 will be described. However, the wooden beam joining structure 6 of the present invention has a concrete wall, a beam, and a steel pillar in addition to the concrete pillar. It can also be applied to a case where a wooden beam 4 is joined to a beam, a wooden column or a beam.

The wooden beam joining structure 6 of the present invention includes a wood joining metal fitting 10 for joining the joint portion 4a of the wooden beam 4 to the side surface 3a of the concrete pillar 3 (hereinafter, simply referred to as “pillar 3”). There is.

The wood joining hardware 10 is arranged between the first joining member 11 rigidly joined to the pillar 3, the second joining member 12 rigidly joined to the wooden beam 4, and the first joining member 11 and the second joining member 12. The first joining member 11 and the third joining member 13 connecting the second joining member 12 are included. Each joining member 11-13 is formed of a metal such as iron or stainless steel.

The first joining member 11 has a flat plate-shaped base plate 11a and a shaft support portion 11b provided at substantially the center of the surface of the base plate 11a on the third joining member 13 side. The shaft support portion 11b is provided so as to face the protruding pin portion 13c of the third joining member 13, which will be described later.

Bolt holes 11c that penetrate the base plate 11a in the thickness direction are formed at each corner of the base plate 11a. That is, in the present embodiment, four bolt holes 11c are formed in the base plate 11a. The number and arrangement positions of the bolt holes 11c are not limited to the above, and can be appropriately set according to the shape and size of the base plate 11a.

The shaft support portion 11b has a hollow cylindrical shape (see FIG. 4), and is formed so that the protruding pin portion 13c of the third joining member 13, which will be described later, can be pivotally supported. Although the details will be described later, in the cylindrical hollow portion of the shaft support portion 11b, the protruding pin portion 13c of the third joining member 13 is referred to as the axial direction of the wooden beam 4 (hereinafter, referred to as “first horizontal direction”). ) Is rotatably supported around the first virtual axis L1.

The base plate 11a is fixed to the side surface 3a of the pillar 3 by anchor bolts 14. The base of the anchor bolt 14 is embedded in the pillar 3, and the tip of the anchor bolt 14 projects from the side surface 3a of the pillar 3. The base plate 11a is fixed to the side surface 3a of the pillar 3 by inserting the tip of the anchor bolt 14 into the bolt hole 11c of the base plate 11a and screwing and tightening the nut 15 through a washer (not shown). The first joining member 11 is rigidly joined to the side surface 3a of the pillar 3.

The second joining member 12 is composed of one flat plate-shaped member, and is arranged so that its main surface faces in the horizontal direction. The second joining member 12 has a fixed end portion 12a fixed to the joint portion 4a of the wooden beam 4 and a connecting end portion 12b connected to the third joining member 13.

A plurality of first drift pin holes 12c through which the drift pin 16 is inserted are formed through the fixed end portion 12a of the second joining member 12. In this embodiment, six first drift pin holes 12c are formed in a matrix of 3 rows and 2 columns. The number and arrangement positions of the first drift pin holes 12c are not limited to the above, and can be appropriately set according to the shape and size of the wooden beam 4.

A first connecting pin hole 12d through which the connecting pin 17 is inserted is formed through the connecting end portion 12b of the second joining member 12. The first connecting pin hole 12d is formed on a second virtual axis L2 extending in a direction orthogonal to the horizontal direction (hereinafter referred to as "second horizontal direction") with respect to the first horizontal direction (axial direction of the wooden beam 4). It is formed to extend along.

Further, diagonally notched first notched portions 12e and 12e are formed at the upper ends and lower ends of the end faces of the connecting end portions 12b of the second joining member 12. In the first notch portions 12e and 12e, when the third joining member 13 rotates with respect to the second joining member 12 (details will be described later), the connecting end portion 12b of the second joining member 12 becomes a second. 3 It is formed so as to prevent it from colliding with the connecting portion 13b of the joining member 13. In the present embodiment, the first cutout portions 12e and 12e are formed in an inclined shape, but the first cutout portions 12e and 12e may be formed in an arc shape or another shape.

The fixed end portion 12a of the second joining member 12 is fixed to the joint portion 4a of the wooden beam 4 by the drift pin 16. Therefore, a fitting groove 4b into which the fixed end portion 12a of the second joining member 12 can be fitted is formed on the end surface of the joint portion 4a of the wooden beam 4. The fitting groove 4b is also opened upward so that the fixed end portion 12a of the second joining member 12 can be fitted from above the wooden beam 4. Further, a second drift pin hole penetrating between the side surface of the joint portion 4a of the wooden beam 4 and the fitting groove 4b is provided on each side of the fitting groove 4b in the joint portion 4a of the wooden beam 4 in the horizontal direction. 4c is formed.

The second joining member 12 has the drift pin 16 inserted into the second drift pin hole 4c on one side surface of the joint portion 4a of the wooden beam 4 in a state where the fixed end portion 12a is fitted into the fitting groove 4b of the wooden beam 4. By inserting the first drift pin hole 12c of the second joining member 12 into the second drift pin hole 4c on the other side surface, the wooden beam 4 is rigidly joined. The drift pin 16 is set to a length so as not to protrude from the other side surface of the wooden beam 4 when driven from one side surface of the wooden beam 4.

The third joining member 13 connects the pair of flat plate portions 13a and 13a extending toward the second joining member 12 and the ends of the pair of flat plate portions 13a and 13a on the first joining member 11 side to each other. It has a connecting portion 13b. That is, the third joining member 13 has a U-shaped shape in a plan view that opens toward the second joining member 12.

The pair of flat plate portions 13a and 13a are arranged so as to face each other in the second horizontal direction at predetermined intervals so that the connecting end portion 12b of the second joining member 12 can be inserted between them. A second connecting pin hole 13d through which the connecting pin 17 is inserted is formed through each end of the pair of flat plate portions 13a and 13a on the second joining member 12 side. The second connecting pin hole 13d is formed so as to extend along the second virtual axis L2 extending in the second horizontal direction.

Further, diagonally notched second notched portions 13e and 13e are formed at the upper and lower ends of the end faces of the pair of flat plate portions 13a and 13a on the second joining member 12 side. The second notch portions 13e and 13e are a pair of flat plate portions 13a and 13a of the third joining member 13 when the third joining member 13 rotates with respect to the second joining member 12 (details will be described later). Is formed so as to prevent the wooden beam 4 from colliding with the end surface of the joint portion 4a. In the present embodiment, the second cutout portions 13e and 13e are formed in an inclined shape, but the second cutout portions 13e and 13e may be formed in an arc shape or another shape.

Further, a protruding pin portion 13c protruding toward the first joining member 11 is formed on the end surface of the connecting portion 13b of the third joining member 13 on the first joining member 11 side. The protruding pin portion 13c is formed so as to project toward the first joining member 11 along the first virtual axis L1 extending in the first horizontal direction. The protruding pin portion 13c is formed in a cylindrical shape complementary to the cylindrical hollow portion of the shaft support portion 11b so as to be pivotally supported by the shaft support portion 11b of the first joining member 11.

The third joining member 13 is rotatable about the first virtual axis L1 with respect to the first joining member 11 by pivotally supporting the protruding pin portion 13c to the shaft support portion 11b of the first joining member 11. Is linked to.

Further, the third joining member 13 has a connecting pin 17 having screw portions formed at both ends in a state where the connecting end portion 12b of the second joining member 12 is inserted between the pair of flat plate portions 13a and 13a. 3 The second joining is performed by inserting the second connecting pin holes 13d and 13d of the joining member 13 and the first connecting pin holes 12d of the second joining member 12 and fastening nuts 18 to both ends of the connecting pin 17. It is rotatably connected to the member 12 about the second virtual axis L2. A screw portion is not formed in the portion of the connecting pin 17 to be inserted into the first connecting pin hole 12d, and the connecting pin 17 is rotatably inserted into the first connecting pin hole 12d.

Further, since the second notch 13e is formed on the end surface of the pair of flat plate portions 13a and 13a of the third joining member 13 on the second joining member 12 side, the third joining member 13 becomes the second joining member 12. When rotating, the pair of flat plate portions 13a, 13a of the third joining member 13 does not collide with the end faces of the joint portions 4a of the wooden beam 4. Similarly, since the first notch 12e is formed on the end surface of the connecting end portion 12b of the second joining member 12 on the third joining member 13 side, the third joining member 13 with respect to the second joining member 12. When rotating, the connecting end portion 12b of the second joining member 12 does not collide with the connecting portion 13b of the third joining member 13.

As described above, in the wood joining metal fitting 10 of the present invention, the first joining member 11 and the third joining member 13 are rotatably connected around the first virtual axis L1 extending in the first horizontal direction, and the second The joining member 12 and the third joining member 13 are rotatably connected around a second virtual axis L2 extending in the second horizontal direction. That is, the wood joint metal fitting 10 of the present invention is configured to be rotatable in two horizontal directions about the first virtual axis and the second virtual axis.

In addition, grease or lubricating oil may be applied between the shaft support portion 11b of the first joining member 11 and the protruding pin portion 13c of the third joining member 13 in order to reduce rotational resistance and frictional resistance. Similarly, grease or lubricating oil is applied to the first connecting pin hole 12d of the second joining member 12 and the second connecting pin hole 13d of the third joining member 13 in order to reduce rotational resistance and frictional resistance. It is good to do it.

Further, the rotatable angle of the third joining member 13 with respect to the second joining member 12 may be set according to the magnitude of the predicted horizontal vibration of the concrete unit A at the time of an earthquake.

A fireproof cover member 20 is arranged around the wood joint metal fitting 10 so as to cover at least the periphery of the third joint member 13. The fireproof cover member 20 may be formed of, for example, non-combustible wood, semi-non-combustible wood, flame-retardant wood, or the like. The refractory cover member 20 may be formed of a refractory material such as a flame-retardant resin. In this way, by covering the periphery of the wood joint metal fitting 10 with the fireproof cover member 20, the fireproof performance around the joint portion 4a of the wooden beam 4 can be improved.

Further, the surface of the fireproof cover member 20 may be formed in a wood grain tone. As a result, the difference in appearance between the refractory cover member 20 and the wooden beam 4 can be reduced, so that the appearance can be improved. Further, the fireproof cover member 20 may be arranged so as to be flush with the outer surface of the burn stop layer and the burn allowance layer that cover the outer periphery of the wooden beam 4 with fire resistance. This makes it possible to further improve the appearance.

The end portion of the fireproof cover member 20 on the pillar 3 side is adhesively bonded to the pillar 3 by the fireproof sealing material 30 having adhesiveness. In this way, when the fireproof cover member 20 and the pillar 3 are adhesively bonded with the fireproof sealing material 30, the gap between the fireproof cover member 20 and the pillar 3 can be sealed with the fireproof sealing material 30, so that the wooden beam 4 can be finished. The fire resistance around the mouth portion 4a can be further improved.

Further, the end portion of the fireproof cover member 20 on the wooden beam 4 side is bonded to the wooden beam 4 by an adhesive fireproof sealing material 30 or an adhesive (not shown). In the present embodiment, the end portion of the fireproof cover member 20 on the wooden beam 4 side is also bonded to the wooden beam 4 by the fireproof sealing material 30. As a result, the gap between the fireproof cover member 20 and the wooden beam 4 can also be sealed with the fireproof sealing material 30, so that the fire resistance around the joint portion 4a of the wooden beam 4 is further improved.

Next, the procedure for joining the pillar 3 and the wooden beam 4 will be described.

First, the base plate 11a of the first joining member 11 is fixed to the side surface 3a of the pillar 3. This fixing is done by the anchor bolt 14 as described above. Further, the fixed end portion 12a of the second joint member 12 is fitted into the fitting groove 4b formed in the joint portion 4a of the wooden beam 4, and in this state, the second joint member 12 is fitted into the joint portion 4a of the wooden beam 4. Fix it. This fixing is done by the drift pin 16 as described above.

Next, the protruding pin portion 13c of the third joining member 13 is inserted into the shaft support portion 11b of the first joining member 11, and the third joining member 13 is connected to the first joining member 11. In this state, the wooden beam 4 is lowered toward the third joint member 13 from above, and the second joint is fixed to the joint portion 4a of the wooden beam 4 between the flat plate portions 13a and 13a of the third joint member 13. The connecting end portion 12b of the member 12 is inserted. Then, in this state, the third joining member 13 is connected to the second joining member 12 by the connecting pin 17.

After that, the fireproof cover member 20 is arranged around the timber joint metal fitting 10, and the end portion of the fireproof cover member 20 on the pillar 3 side and the end portion on the wooden beam 4 side are attached to the pillar 3 and the wooden beam 4 by the fireproof sealing material 30. Fix it. As a result, the joining of the pillar 3 and the wooden beam 4 is completed, and the state shown in FIGS. 2 and 3 is obtained.

Next, the action and effect of the wood joining metal fitting 10 constituting the wooden beam joining structure 6 of the present invention at the time of an earthquake will be described. 5A and 5B are views showing a multi-story building 1 to which the wooden beam joint structure 6 of the present invention is applied, where FIG. 5A shows a normal state and FIG. 5B shows a state at the time of an earthquake. In the example of FIG. 5, only one concrete unit A in the multi-layer building 1 shown in FIG. 1 is shown. Further, in the example of FIG. 5, the wooden pillar 5 erected on the floor side slab 2 of the concrete structure unit A does not extend to the ceiling side slab 2 of the concrete structure unit A.

In the event of an earthquake, the pillar 3 of the concrete unit A vibrates in two horizontal directions due to the horizontal vibration of the earthquake. The wood of the present invention fixed to the pillar 3 (or the wooden pillar 5) at the joint portion (the portion surrounded by the broken circle) between the wooden beam 4 and the pillar 3 (or the wooden pillar 5) due to the vibration of the pillar 3. The metal joint 10 will rotate relative to the joint 4a of the wooden beam 4.

At this time, in the wood joining metal fitting 10 of the present invention, the third joining member 13 rotates about the first virtual axis L1 with respect to the first joining member 11 in response to the vibration of the pillar 3 in two horizontal directions. Rotation can be performed about the second virtual axis L2 with respect to the second joining member 12. That is, the wood joint metal fitting 10 of the present invention can follow the vibration of the pillar 3 in two horizontal directions by rotating in two horizontal directions about the first virtual axis L1 and the second virtual axis L2. .. This makes it possible to prevent a bending moment from being generated at the joint portion 4a of the wooden beam 4 at the time of an earthquake. Therefore, the second drift pin hole 4c of the wooden beam 4 is not deformed or damaged during an earthquake.

A steel frame unit may be used instead of the concrete unit A, and in either case, the horizontal inclination at the time of an earthquake can be restored to the original state after the earthquake by designing appropriately. can. Then, when the concrete unit A or the steel frame unit returns to the original state, the wooden unit B arranged inside the unit and joined to the pillar or the like of the unit also returns to the original state. Further, the concrete unit A is made of prestressed concrete to which stress is applied in advance with a tension material or the like, so that the concrete unit A positively returns to the original state shown in FIG. 5 (A) after tilting in two horizontal directions at the time of an earthquake. Can be designed to do.

Although the description of the specific embodiment is completed above, the present invention can be widely modified without being limited to the above embodiment.

For example, in the above embodiment, the first joining member 11 is fixed to the pillar 3 and the second joining member 12 is fixed to the wooden beam 4, but conversely, as shown in FIG. 6, the second joining member 3 is fixed to the pillar 3. The member 12 may be fixed, and the first joining member 11 may be fixed to the wooden beam 4. In this case, the second joining member 12 is composed of a flat plate-shaped member 120a extending toward the third joining member 13 and a base plate 120b for fixing the flat plate-shaped member 120a to the pillar 3.

The flat plate-shaped member 120a is configured in the same manner as the connecting end portion 12b of the second joining member 12 of the above embodiment, and is connected to the third joining member 13 by a connecting pin 17. The base plate 120b is configured in the same manner as the base plate 11a of the first joining member 11 of the above embodiment, and is fixed to the pillar 3 by anchor bolts 14. Further, the first joining member 11 further has two connecting plates 110 and 110 extending vertically from the surface of the base plate 11a on the wooden beam 4 side. The connecting plates 110 and 110 are configured in the same manner as the fixed end portion 12a of the second joining member 12 of the above embodiment, and are fixed to the joint portion 4a of the wooden beam 4 by the drift pin 16.

Further, in the above embodiment, the protruding pin portion 13c is provided on the third joining member 13, and the shaft support portion 11b is provided on the first joining member 11. On the contrary, as shown in FIG. 7, the first joining member 11 is provided. The protruding pin portion 13c may be provided on the third joining member 13, and the shaft support portion 11b may be provided on the third joining member 13. In this case, the protruding pin portion 13c is provided so as to project toward the third joining member 13 at substantially the center of the surface of the base plate 11a of the first joining member 11 on the third joining member 13 side. Further, the shaft support portion 11b is provided on the end surface of the third joining member 13 on the first joining member 11 side so as to face the protruding pin portion 13c.

Further, in the above embodiment, the second joining member 12 is composed of one flat plate-shaped member, but as shown in FIG. 8, it may be composed of two flat plate-shaped members. In this case, the second joining member 12 is composed of a pair of plate portions 121 and 121, and a connecting portion 122 that horizontally connects the plate portions 121 and 121 to each other in the intermediate portion in the extending direction thereof. Then, on the end surface of the joint portion 4a of the wooden beam 4, two fitting grooves 4b and 4b into which the pair of plate portions 121 and 121 of the second joining member 12 can be fitted, respectively, and the connecting portion of the second joining member 12 are connected. It forms a notch 4d that can accept 122.

The pair of plate portions 121 and 121 are configured in the same manner as the second joining member 12 of the above embodiment, and are fixed to the wooden beam 4 by the drift pin 16. Further, the third joining member 13 has three flat plate portions 13a, 13a, 13a, and each plate portion 121 is inserted between the adjacent flat plate portions 13a, 13a. Then, in this state, the third joining member 13 is connected to the second joining member 12 by the connecting pin 17.

In the modified example of FIG. 8, since the second joining member 12 is fixed to the joint portion 4a of the wooden beam 4 via the pair of plate portions 121 and 121, the second joining member 12 is formed from one flat plate-shaped member. Compared with the case where it is configured, the bonding force between the second joining member 12 and the wooden beam 4 can be increased. Further, since the second joining member 12 is connected to the third joining member 13 via the pair of plate portions 121 and 121, the second joining member 12 has a second degree as compared with the case where the second joining member 12 is composed of one flat plate-shaped member. The connecting force between the two joining members 12 and the third joining member 13 can be increased.

In addition, the specific configuration, arrangement, quantity, angle, etc. of each member or portion can be appropriately changed as long as it does not deviate from the gist of the present invention. Further, a part of the configuration of the above embodiment may be appropriately combined or appropriately discarded. Further, not all of the components shown in the above embodiments are indispensable, and they can be appropriately selected.

1 Multi-layer building 2 Concrete slab 3 Concrete pillar (structure)
4 Wooden beam 5 Wooden pillar 6 Wooden beam joint structure 10 Wood joint hardware 11 1st joint member 12 2nd joint member 13 3rd joint member 11b Shaft support 12d 1st connection pin hole 13a Flat plate part 13c Protruding pin part 13d 2nd Connecting pin hole 17 Connecting pin 20 Fireproof cover member 30 Fireproof sealing material A Concrete unit B Wooden unit L1 1st virtual axis L2 2nd virtual axis

Claims (7)

It is a wooden beam joint structure that joins a structure and a wooden beam.
A first joining member that is rigidly joined to one of the structure and the wooden beam,
A second joining member that is rigidly joined to the other of the structure and the wooden beam,
It is provided with a metal joint for wood, which is arranged between the first joint member and the second joint member and includes the first joint member and the third joint member connecting the second joint member.
The third joining member is
It is rotatably connected to the first joining member about a first virtual axis extending in the axial direction of the wooden beam, and is orthogonal to the second joining member in the horizontal direction with respect to the axial direction of the wooden beam. A wooden beam joining structure characterized in that it is configured to be rotatably connected around a second virtual axis extending in a horizontal direction. One of both the first joining member and the third joining member has a protruding pin portion that protrudes toward the other of the both members along the first virtual axis.
The other of the two members has a shaft support portion capable of pivotally supporting the protruding pin portion.
The wooden beam joining structure according to claim 1, wherein one of the two members is rotatably connected to the other of the two members via the protruding pin portion and the shaft support portion. The second joining member has a first connecting pin hole that penetrates the member along the second virtual axis.
The third joining member has a second connecting pin hole that penetrates the member along the second virtual axis.
The third joining member is characterized in that it is rotatably connected to the second joining member via a connecting pin inserted through the first connecting pin hole and the second connecting pin hole. 1 or the wooden beam joining structure according to claim 2. The second joining member has a connecting end that extends toward the third joining member and has the first connecting pin hole formed therein.
The third joining member has a pair of flat plate portions extending toward the second joining member and having the second connecting pin hole formed therein.
3. The pair of flat plates are arranged so as to be horizontally separated from each other so that the connecting end portion of the second joining member can be inserted between the flat plates. Wooden beam joint structure described in. The wooden beam joining structure according to any one of claims 1 to 4, further comprising a fireproof cover member that covers at least the periphery of the third joining member. The wooden beam joining structure according to claim 5, further comprising a fireproof sealing material for sealing a gap between the fireproof cover member and the structure. The wooden beam joining structure according to any one of claims 1 to 6, wherein the structure is a concrete column of a concrete unit including a concrete column, a beam, or a slab.

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