JP7457557B2 - Joint structure of wooden shaft members - Google Patents

Description

The present invention relates to a joint structure for wooden shaft members.

In wooden buildings using the wooden frame construction method, the wooden shaft members that form columns, beams, foundations, etc. are joined together using joining metal fittings, and the earthquake resistance is improved by bonding the members together. There is.

An example of a structure for joining columns and beams of a wooden building using the above-mentioned joining metal fittings and a joining metal fitting applied to this joining structure has been proposed. Specifically, a column joint plate is provided on one side of a side plate that overlaps the side of the column to be inserted into the vertical hole of the column, and a beam joint plate is provided on the other side of the side plate to insert a vertical groove formed in the end of the beam. A joining metal fitting is formed by providing a beam receiving plate at a lower position of this beam joining plate. A plurality of connection holes are provided for the column connection plate of the connection fittings for fastening the columns using fasteners, and a plurality of connection holes are provided for the beam connection plate for fastening the beams using the fasteners. The arrangement and number of bonding holes are set according to the edge clearance conditions of the steel plates used for each bonding plate. Drift pins are used as fasteners, and a wooden rigid frame structure is constructed by connecting wooden columns and beams that form a gate-shaped frame (for example, see Patent Document 1).

JP 2005-299150 A

By the way, there are a plurality of types of joint structures of beams and columns in the wooden frame construction method, for example, as shown below. One form of this is a so-called beam joint structure in which a pillar is attached to the top or bottom of the beam, and a metal pipe called a tenon pipe is buried in both sides so as to straddle the pillar and the beam. A communicating hole is formed by aligning the pin hole opened in the beam and the pin hole opened in the beam or column, and a metal fixed shaft member such as a drift pin is inserted into the communicating hole. This is a bonded structure.

In another embodiment, a pair of metal connection pieces are arranged on the upper and lower surfaces of the beam, and these metal connection pieces are joined by bolts (attachment bolts) that pass through the beam. A housing groove is formed in the column and extends into the column from the end surface connected to the beam. A fitting member (such as a metal plate or a tenon pipe) that fits into this accommodation groove is attached to the metal connection piece. This is a joining structure formed by fitting a fitting member into a housing groove and inserting a metal fixed shaft member such as a drift pin into a communicating hole formed by pin holes at corresponding positions on both sides. .

According to the latter joint structure, it is possible to form a joint structure of wooden shaft members with even higher joint strength. However, in this joint structure, the factor that determines the design load (allowable load) is the sinking of the column into the beam, and a load greater than the load that causes this sinking (the sinking load) cannot be expected in the design of the joint structure. For example, wooden beams are manufactured with the fibers oriented in the longitudinal direction, so in a jointed structure in which columns are attached to the sides of the beam, the axial force (e.g. compressive force) acting from the columns causes The beam may sink in the direction perpendicular to the fibers. Since the sinking strength in the direction perpendicular to the fibers on the side surface of the wooden shaft member is relatively low, and considering that the design load in the joint structure of the wooden shaft member is determined by the sinking load, it is considered that the joint structure of the wooden shaft member has a large It is difficult to estimate the design load.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a joint structure for wooden shaft members that can increase the design load when designing a joint structure for wooden shaft members.

In order to achieve the above object, one aspect of the joint structure of the wooden shaft member according to the present invention is as follows:
a first wooden shaft member provided with a first bolt hole through which a mounting bolt passes; and a second wooden shaft member provided with a housing groove into which a portion of the first joint fitting is fitted;
The first joint fitting includes a first connection piece connected to the first wooden shaft member, and a fitting member that stands up from the first connection piece and fits into the accommodation groove,
A second bolt hole is opened in the first connection piece at a position corresponding to the first bolt hole,
The fitting member has a first pin hole through which the metal fixed shaft member is inserted,
It further includes a second joint fitting that includes only a second connection piece that is connected to the first wooden shaft member, and the second connection piece has a third bolt hole at a position corresponding to the first bolt hole. was established,
The first joint metal fitting and the second joint metal fitting are arranged on opposing sides of the first wooden shaft member, and the mounting bolt is inserted into the first bolt hole, the second bolt hole, and the third bolt hole. and bolted together.
A second pin hole is further provided in the second wooden shaft member at a position corresponding to the first pin hole when the fitting member is fitted into the accommodation groove,
Joining of wooden shaft members, in which the first wooden shaft member and the second wooden shaft member are joined by inserting the metal fixed shaft member into the second pin hole corresponding to the first pin hole. In structure,
Of the first wooden shaft member, a fourth bolt hole is provided at a location where the first connection piece is disposed, and a fifth bolt hole is provided at a location where the second connection piece is disposed. and
A metal reinforcing shaft member is embedded in each of the fourth bolt hole and the fifth bolt hole.

According to this aspect, the first joint metal fitting and the second joint metal fitting are joined by the mounting bolt penetrating the first wooden shaft member, and the fitting member forming the first joint metal fitting is inserted into the accommodation groove of the second wooden shaft member. In the joint structure in which the first joint fitting and the second wooden shaft member are fixed by the metal fixed shaft member, the first connecting piece forming the first joint fitting is arranged in the first wooden shaft member. A metal reinforcing shaft member is inserted into the fourth bolt hole provided at the location where the second connection piece forming the second joint fitting is disposed, and the fifth bolt hole provided at the location where the second connection piece forming the second joint fitting is disposed. There is. With this configuration, the end face of the metal reinforcing shaft member embedded in the first wooden shaft member contacts and supports the first connecting piece and the second connecting piece, so that the first wooden shaft member and the metal reinforcing shaft Both members can resist the axial force (compressive force or tensile force) acting from the second wooden shaft member.

The joint structure of this embodiment is, for example, a joint structure in which the first wooden shaft member is a ceiling beam, the second wooden shaft member is a column that supports the ceiling beam, and these ceiling beams and columns are joined.

In the conventional joint structure, the axial force such as compressive force acting from the second wooden shaft member was countered only by the sinking strength of the second wooden shaft member, so the load corresponding to the sinking strength of the second wooden shaft member ( The allowable load when designing the joint structure was set based on the sinking load). On the other hand, in the joint structure of this embodiment, for example, one or more metal reinforcing shaft members are attached to the first wooden shaft member where the first connection piece comes into contact with the first connection piece so as to support the first connection piece from below. It is arranged. Therefore, axial force such as compressive force acting from the second wooden shaft member is transmitted to both the second wooden shaft member and the metal reinforcing shaft member via the first connection piece.

The shared load transmitted to the first wooden shaft member and the metal reinforced shaft member (to be borne by each member) is determined, for example, according to the ratio of the rigidity of both, and the first wooden shaft member carries the shared load based on its sinking capacity. In contrast, the metal reinforcing shaft member resists the shared load by the peripheral surface friction force between it and the first wooden shaft member. If the rigidity of the metal-reinforced shaft member is greater than that of the first wooden shaft member, the metal-reinforced shaft member will bear a relatively large shared load, and the first wooden shaft member will bear a load equivalent to its sinking strength. This creates a margin for the load to be applied, and the allowable load in the joint structure can be increased.

Here, when receiving compressive force as an axial force from the second wooden shaft member, metal reinforcement supporting the first connecting piece of the first joint fitting located at a position sandwiched between the first wooden shaft member and the second wooden shaft member The shaft member bears part of the applied compressive force. On the other hand, when a tensile force is received as an axial force from the second wooden shaft member, this tensile force is transmitted to the second connecting piece of the second joint fitting via the mounting bolt connected to the first connecting piece, and the second The metal reinforcing shaft member supporting the connecting piece bears part of the applied tensile force. In this way, when compressive force and tensile force act as axial forces from the second wooden shaft member, the metal reinforcing shaft members corresponding to the compressive force and tensile force, respectively, act on the shaft acting from the second wooden shaft member. can bear some of the power.

In this embodiment, drift pins, bolts, etc. can be used as the metal fixed shaft member. In addition, various metal shaft members, including steel bars (deformed steel bars, round steel bars), can be used as the metal reinforcing shaft member. Furthermore, steel plates, tenon pipes, etc. can be used as the fitting members that form the first connecting fitting, and the accommodation grooves of the second wooden shaft member are applied with shapes and dimensions that correspond to these steel plates and tenon pipes.

Further, other aspects of the joint structure of the wooden shaft member according to the present invention are as follows:
a first wooden shaft member provided with a first bolt hole through which a mounting bolt passes; and a second wooden shaft member provided with a housing groove into which a portion of the first joint fitting is fitted;
The pair of first bolt holes are arranged at diagonal corners of the second wooden shaft member when viewed in the longitudinal direction of the second wooden shaft member,
The first joint fitting includes a first connection piece connected to the first wooden shaft member, and a fitting member that stands up from the first connection piece and fits into the accommodation groove,
A pair of second bolt holes are opened in the first connection piece at positions corresponding to the pair of first bolt holes,
The fitting member has a first pin hole through which the metal fixed shaft member is inserted,
The two first joining fittings are arranged on opposing sides of the first wooden shaft member, and the mounting bolts are inserted into the first bolt hole and the two second bolt holes to be bolted together,
The second wooden shaft member further has a second pin hole at a position corresponding to the first pin hole when the fitting member is fitted into the accommodation groove,
Joining of wooden shaft members, in which the first wooden shaft member and the second wooden shaft member are joined by inserting the metal fixed shaft member into the second pin hole corresponding to the first pin hole. In structure,
A fourth bolt hole is provided at a location where one of the first connection pieces is disposed in the first wooden shaft member, and a fifth bolt hole is provided at a location where the other first connection piece is disposed. A hole has been opened,
A metal reinforcing shaft member is embedded in each of the fourth bolt hole and the fifth bolt hole ,
The fitting member has a plate shape,
The plate thickness directions of the fitting members of the two first joint fittings are arranged in directions orthogonal to each other,
The metal fixed shaft members inserted into the first pin holes of the fitting members of the two first joint fittings are arranged in directions perpendicular to each other.

Also according to this aspect, both the first wooden shaft member and the metal reinforcing shaft member can resist the axial force (compressive force or tensile force) acting from the second wooden shaft member. In this embodiment, two first joint fittings each having a first connection piece and a fitting member are disposed on the upper and lower surfaces of the first wooden shaft member, and a pair of first connecting bolts passing through the first wooden shaft member are arranged on the upper and lower surfaces of the first wooden shaft member. Join the connecting pieces. Then, the upper and lower fitting members fit into the accommodation grooves of the second wooden shaft members located above and below the first wooden shaft member, and are fixed by the metal fixed shaft members. In the joint structure of this embodiment having such a configuration, for example, the first wooden shaft member is a beam on an upper floor such as the second or third floor (floor beam, inter-floor beam, etc.), and the second wooden shaft member is a beam on the upper floor. This is a beam-to-column joint structure, with the columns on the lower floor and the columns on the lower floor.

Further, other aspects of the joint structure of the wooden shaft member according to the present invention are as follows:
a first wooden shaft member provided with a first bolt hole through which a mounting bolt passes; and a second wooden shaft member provided with a housing groove into which a portion of the first joint fitting is fitted;
The first joint fitting includes a first connection piece connected to the first wooden shaft member, and a fitting member that stands up from the first connection piece and fits into the accommodation groove,
A second bolt hole is opened in the first connection piece at a position corresponding to the first bolt hole,
The fitting member has a first pin hole through which the metal fixed shaft member is inserted,
further comprising a foundation to which the first wooden shaft member is connected;
The mounting bolt is an anchor bolt that extends upward from the foundation,
The first joint fitting and the foundation are disposed on opposing sides of the first wooden shaft member, and the anchor bolt is inserted into the first bolt hole and the second bolt hole and bolted together,
A second pin hole is further provided in the second wooden shaft member at a position corresponding to the first pin hole when the fitting member is fitted into the accommodation groove,
Joining of wooden shaft members, in which the first wooden shaft member and the second wooden shaft member are joined by inserting the metal fixed shaft member into the second pin hole corresponding to the first pin hole. In structure,
Of the first wooden shaft member, a fourth bolt hole is provided at a location where the first connection piece is provided, and a fifth bolt hole is provided at a location where the foundation is provided,
A metal reinforcing shaft member is embedded in each of the fourth bolt hole and the fifth bolt hole.

Also according to this aspect, both the first wooden shaft member and the metal reinforcing shaft member can resist the axial force (compressive force or tensile force) acting from the second wooden shaft member. In this aspect, the anchor bolt extending upward from the foundation is a mounting bolt, and this mounting bolt passes through the first wooden shaft member, and the first joint metal fitting is disposed on the upper surface of the first wooden shaft member. The first connecting piece connects the first wooden shaft member to a foundation made of reinforced concrete, for example. Therefore, in the joint structure of this embodiment, for example, the first wooden shaft member is a beam of a foundation installed on a cloth foundation, etc., and the second wooden shaft member is a column on the first floor. It becomes a bonded structure.

Another aspect of the joining structure for wooden shaft members according to the present invention is characterized in that the metal reinforcing shaft member is a bolt with a threaded groove on its circumferential surface.

According to this aspect, since the metal-reinforced shaft member is a bolt with a thread groove on its circumferential surface, the circumferential friction force between the first wood-based shaft member and the metal-reinforced shaft member increases, and the first wood-based shaft member The joint strength between the shaft member and the metal-reinforced shaft member can be increased. As a result, the first wooden shaft member and the metal reinforcing shaft member, which are joined to each other with high joint strength, can integrally resist the axial force acting from the second wooden shaft member. Here, the bolts forming the metal reinforcing shaft member are preferably bolts with a relatively larger diameter than the mounting bolts, and for example, commercially available lag screw bolts can be used. For example, the lag screw bolt can be embedded inside the first wooden shaft member by screwing the lag screw bolt into the fourth bolt hole or the fifth bolt hole. At this time, the head of the lag screw bolt may have a hexagonal head, may be provided with a female thread, or may be provided with a male thread. A rotary tool can be inserted and the lag screw bolt can be screwed in.

Further, in another aspect of the joint structure of the wooden shaft member according to the present invention, a communicating bolt hole is formed in which the fourth bolt hole and the fifth bolt hole communicate with each other, and the communicating bolt hole is connected to the metal reinforcing shaft member. is inserted through it.

According to this embodiment, the fourth bolt hole and the fifth bolt hole communicate to form a communicating bolt hole, and a metal reinforcing shaft member having a length spanning between the opposing side surfaces of the first wooden shaft member is inserted into this communicating bolt hole, so that (the end face of) the metal reinforcing shaft member abuts against the first connecting piece of the first connecting metal fitting arranged on the opposing upper and lower surfaces of the first wooden shaft member, or abuts against the first connecting piece of the first connecting metal fitting and the second connecting piece of the second connecting metal fitting arranged on the opposing upper and lower surfaces of the first wooden shaft member, making it possible for the common metal reinforcing shaft member to resist both compressive and tensile forces acting from the second wooden shaft member.

As can be understood from the above explanation, the joint structure of the wooden shaft member of the present invention makes it possible to increase the design load of the joint structure.

An exploded perspective view of a first wooden shaft member, a first joint metal fitting, a second joint metal fitting, a mounting bolt, and a metal reinforcing shaft member, which form the joint structure of the wooden shaft member according to the first embodiment, before being assembled to each other. It is. 1 is an exploded oblique view of a first wooden shaft member to which a first connecting fitting, a second connecting fitting, an attachment bolt, and a metal reinforcing shaft member are assembled, and a second wooden shaft member; FIG. 2 is a perspective view showing an example of the joint structure of the wooden shaft member according to the first embodiment. (a) is a schematic diagram illustrating the opposing force when compressive force acts on the first wooden shaft member as an axial force from the second wooden shaft member, and (b) is a schematic diagram illustrating the axial force from the second wooden shaft member. FIG. 2 is a schematic diagram illustrating the opposing force when a tensile force acts on the first wooden shaft member. It is a perspective view which shows an example of the joint structure of the wooden shaft member based on 2nd Embodiment. It is a perspective view which shows an example of the joint structure of the wooden shaft member based on 3rd Embodiment. It is a perspective view which shows an example of the joint structure of the wooden shaft member based on 4th Embodiment. It is a perspective view which shows an example of the joint structure of the wooden shaft member based on 5th Embodiment.

Hereinafter, the joint structure of the wooden shaft member according to each embodiment will be described with reference to the attached drawings. Note that, in this specification and the drawings, substantially the same constituent elements may be given the same reference numerals to omit redundant explanation.

[Joint structure of wooden shaft member according to the first embodiment]
First, the joint structure of the wooden shaft member according to the first embodiment will be described with reference to Fig. 1 to Fig. 4. Here, Fig. 1 is an exploded perspective view of the first wooden shaft member, the first joint fitting, the second joint fitting, the mounting bolt, and the metal reinforcing shaft member before they are assembled to each other, which form the joint structure of the wooden shaft member according to the first embodiment, and Fig. 2 is an exploded perspective view of the first wooden shaft member and the second wooden shaft member to which the first joint fitting, the second joint fitting, the mounting bolt, and the metal reinforcing shaft member are assembled. Fig. 3 is a perspective view showing an example of the joint structure of the wooden shaft member according to the first embodiment. Furthermore, Fig. 4(a) is a schematic diagram explaining the counter force when a compressive force acts on the first wooden shaft member as an axial force from the second wooden shaft member, and Fig. 4(b) is a schematic diagram explaining the counter force when a tensile force acts on the first wooden shaft member as an axial force from the second wooden shaft member.

The joint structure 100 for wooden shaft members is a joint structure between a first wooden shaft member 10, which is a wooden ceiling beam (an example of a wooden beam), and a second wooden shaft member 20, which is a wooden pillar. As shown in FIG. 2, both the first wooden shaft member 10 and the second wooden shaft member 20 are made of laminated wood consisting of multiple laminae 11, 21 stacked together, with the fiber direction being the longitudinal direction of each member. The first wooden shaft member 10 and the second wooden shaft member 20 may alternatively be made of solid wood.

As shown in FIG. 1, the first wooden shaft member 10 is provided with a first bolt hole 12 through which a mounted bolt 38 with a head passes. Two first bolt holes 12 are provided at one diagonal position of the square in plan view.

The first joint fitting 33 that directly connects the first wooden shaft member 10 and the second wooden shaft member 20 includes a first connecting piece 31 that comes into contact with the side surface (lower surface in the illustrated example) of the first wooden shaft member 10; A fitting member 32 is installed upright from the first connection piece 31 (in the illustrated example, it is hanging down, but this is also included in the upright installation) and fitted into the accommodation groove 22 of the second wooden shaft member 20. have The first connecting piece 31 and the fitting member 32 are both formed of flat steel. In addition, the fitting member 32 may also be a steel tenon pipe or the like.

The first connecting piece 31 has a plurality of second bolt holes 31a (two in the illustrated example) at positions corresponding to the first bolt holes 12 of the first wooden shaft member 10, and the fitting member 32 has a plurality of first pin holes 32a (four in the illustrated example) through which the metal fixing shaft member 40 (see FIG. 2) is inserted.

In the first wooden shaft member 10, a second joining fitting 34 including only a second connecting piece is disposed on the upper surface opposite to the lower surface against which the first joining fitting 33 comes into contact. A plurality of (two in the illustrated example) third bolt holes 34a are opened at positions corresponding to the first bolt holes 12 after the second connection piece 34.

The first wooden shaft member 10 further has two fourth bolt holes 13 at the location where the first connecting piece 31 is disposed, and two fifth bolt holes 14 at the location where the second connecting piece 34 is disposed. The fourth bolt hole 13 and the fifth bolt hole 14 are coaxial and do not communicate with each other. In addition, in a plan view, the two fourth bolt holes 13 and the two fifth bolt holes 14 are provided at the other diagonal position different from the two first bolt holes 12 at the diagonal positions of the square.

Metal reinforcing shaft members 50 are screwed into the fourth bolt hole 13 and the fifth bolt hole 14 in the X1 direction and the X2 direction, respectively. When the metal reinforcing shaft member 50 is screwed into the fourth bolt hole 13 and the fifth bolt hole 14, the upper end or lower end of the metal reinforcing shaft member 50 is flush with the upper or lower surface of the first wooden shaft member 10. Therefore, the upper end of the metal reinforcing shaft member 50 located above contacts the second connecting piece 34, and the lower end of the metal reinforcing shaft member 50 located below contacts the first connecting piece 31.

Here, the metal reinforcing shaft member 50 is a bolt having a thread groove on its circumferential surface, and a bolt having a relatively larger diameter than the mounting bolt 38 is applied to the metal reinforcing shaft member 50, for example, a bolt that is commercially available. Lag screw bolts can be applied. The metal reinforcing shaft member 50 in the illustrated example has a female screw 51 at one end, and the tip of a rotary tool (not shown) is fitted into the female screw 51, and the fourth bolt hole 13 and the fifth bolt hole 14 are fitted into the female screw 51. It is becoming more and more complicated. Note that the metal reinforcing shaft member 50 may have a male screw or a hexagonal head at one end, into which the tip of a rotary tool is fitted.

By using a bolt with a thread groove on its circumferential surface as the metal reinforcing shaft member 50, the circumferential surface friction force between the first wooden shaft member 10 and the metal reinforcing shaft member 50 increases, and the first wooden shaft member 50 The bonding strength between the shaft member 10 and the metal reinforcing shaft member 50 can be increased. After the metal reinforcing shaft member 50 is screwed into the fourth bolt hole 13 and the fifth bolt hole 14, respectively, the second connecting piece 34 is arranged on the upper surface of the first wooden shaft member 10, and the first wooden shaft member A first connecting piece 31 (first joining metal fitting 33) is arranged on the lower surface of 10, and a mounting bolt 38 is inserted in the X3 direction into the corresponding third bolt hole 34a, first bolt hole 12, and second bolt hole 31a. Insert. The mounting bolt 38 has a head 38b such as a hexagonal head that engages with the second connecting piece 34 at one end, and a male screw 38a at the other end. A first wooden shaft with a plurality of metal reinforcing shaft members 50 embedded therein by screwing a tightening nut 39 in the X4 direction onto the male screw 38a protruding from the second bolt hole 31a of the first connecting piece 31 and tightening it. A first joining metal fitting 33 and a second joining metal fitting 34, which are connected to each other via a mounting bolt 38, are assembled to the member 10 (see the upper diagram of FIG. 2). Note that the mounting bolt 38 may not include the head 38b and may be tightened with a hexagonal nut or the like.

As shown in FIG. 2, the fitting member 32 forming the first joint fitting 33 attached to the lower surface of the first wooden shaft member 10 extends toward the second wooden shaft member 20 located below. . A housing groove 22 having the same shape and size as the fitting member 32 is provided in the second wooden shaft member 20 from the center of the upper surface thereof to the inside thereof. Further, in the second wooden shaft member 20, a second pin hole 23 is formed at a position corresponding to the first pin hole 32a when the fitting member 32 is fitted into the housing groove 22. Further, the upper end surface of the second wooden shaft member 20 is provided with a bolt/nut accommodating groove for accommodating the ends of the tightening nuts 39 and the mounting bolts 38 that protrude downward when the second wooden shaft member 20 is joined to the first wooden shaft member 10. 24 have been established.

As shown in FIG. 2, the fitting member 32 protruding from the lower surface of the first wooden shaft member 10 is fitted into the accommodation groove 22 of the second wooden shaft member 20 in the X5 direction. By this fitting, as shown in FIG. 3, a communicating pin hole 25 is formed by the corresponding first pin hole 32a and second pin hole 23. The joining structure 100 shown in FIG. 3 is formed by inserting the metal fixed shaft member 40 in the X6 direction as shown in FIG. 2 into each of the plurality of (four in the illustrated example) communicating pin holes 25. Here, as the metal fixed shaft member 40, a drift pin, a bolt, etc. can be applied.

As shown in FIGS. 4(a) and 4(b), the first wooden shaft member 10, which is a ceiling beam, receives an overturning moment due to horizontal force acting on the wooden framework during earthquakes, strong winds, etc. When this occurs, compressive force N1 and tensile force N2 act as axial force from the second wooden shaft member 20.

First, as shown in FIG. 4(a), in the case where a compressive force N1 acts as an axial force from the second wooden shaft member 20, the counterforce in the first wooden shaft member 10 that opposes this compressive force N1 will be explained. .

When an upward compressive force N1 acts as an axial force from the second wooden shaft member 20 below the first wooden shaft member 10, the compressive force N1 acts on the first wooden shaft member 10 at a point where the first wooden shaft member 10 abuts against the first connecting piece 31 through the first connecting piece 31 of the first connecting metal fitting 33 connected to the second wooden shaft member 20. In a conventional wooden shaft member joint structure, i.e., a joint structure that does not have a metal reinforcing shaft member 50, the compressive force N1 is countered only by the embedment strength of the first wooden shaft member 10 at the point where the first connecting piece 31 abuts. Since the embedment strength in the direction perpendicular to the grain on the side of the wooden shaft member is relatively low, the design load in a conventional joint structure is often determined by the load equivalent to this embedment strength (embedding load), and therefore it was difficult to anticipate a large design load in a wooden shaft member joint structure.

On the other hand, in the illustrated joint structure 100, a plurality of first connection pieces 31 (in the illustrated example, two Two metal reinforcing shaft members 50 are provided. Therefore, the compressive force N1 acting from the second wooden shaft member 20 is transmitted to both the second wooden shaft member 20 and the metal reinforcing shaft member 50 via the first connection piece 31. The respective shared loads transmitted to the first wooden shaft member 10 and the metal reinforcing shaft member 50 are determined according to the ratio of their rigidities. The first wooden shaft member 10 resists the shared load with its sinking strength P, and the metal reinforced shaft member 50 resists the shared load with the circumferential frictional force Q between it and the first wooden shaft member 10. do.

For example, if the rigidity of the metal reinforced shaft member 50 is greater than that of the first wooden shaft member 10, the metal reinforced shaft member 50 will bear a relatively large shared load, and the first wooden shaft member 10 will There will be some leeway before receiving a load equivalent to the sinking strength. For example, when the first wooden shaft member 10 has a sinking strength of 1000, in the conventional structure, the acting axial force (set load) can only be set up to the sinking strength of 1000. On the other hand, in the illustrated joint structure 100, the sinking strength of the first wooden shaft member 10 is 1000, and the peripheral surface friction force between the metal reinforcing shaft member 50 and the first wooden shaft member 10 is 2000. Furthermore, the allowable load in the joint structure 100 can be increased to a maximum of 3000 loads (compressive force N1). Further, when the rigidity ratio of the metal reinforced shaft member 50 and the first wooden shaft member 10 is, for example, 3:1, if the compressive force N1 actually acting from the second wooden shaft member 20 is 1000 (the allowable load is 3000 as described above), the load of the first wooden shaft member 10 may be 250 (1/4 of the compressive force of 1000), which is less than the allowable load of the first wooden shaft member 10 (load corresponding to the sinking strength). By 1000, there will be a margin (750 margin) in the load that can be borne.

On the other hand, as shown in FIG. 4(b), when the tensile force N2 acts as an axial force from the second wooden shaft member 20, this tensile force N2 is applied via the mounting bolt 38 connected to the first connecting piece 31. The upper metal reinforcing shaft member 50 that supports the second connecting piece 34 bears a part of the applied tensile force N2. That is, in this case as well, the first wooden shaft member 10 resists the shared load with its sinking strength P, and the two upper metal reinforcing shaft members 50 have a circumferential surface between them and the first wooden shaft member 10. The shared load is countered by frictional force Q.

As shown in FIGS. 4(a) and 4(b), when either the compressive force N1 or the tensile force N2 acts as an axial force from the second wooden shaft member 20, the compressive force N1 and the tensile force N2 The metal reinforcing shaft member 50 corresponding to each of (the lower metal reinforcing shaft member 50 for compressive force N1, the upper metal reinforcing shaft member 50 for tensile force N2) responds to the axial force acting from the second wooden shaft member 20. This makes it possible to increase the design load that can be expected in the joint structure 100 of wooden shaft members.

[Joining structure of wooden shaft member according to second embodiment]
Next, with reference to FIG. 5, an example of the joint structure of the wooden shaft member according to the second embodiment will be described. Here, FIG. 5 is a perspective view showing an example of the joint structure of the wooden shaft member according to the second embodiment.

The illustrated wooden shaft member joining structure 100A differs from joining structure 100 in that the metal reinforcing shaft member 50A has a male screw 52 at its end, which passes through a screw hole (not shown) in the first connecting piece 31 and is tightened with a nut 53, thereby connecting the metal reinforcing shaft member 50A to the first connecting piece 31. The upper metal reinforcing shaft member 50A also has a male screw at its upper end tightened with a nut (neither shown), connecting it to the second connecting piece 34.

In this way, the metal reinforcing shaft member 50A is connected to the first connecting piece 31 and the second connecting piece 34 via the nut 53, so that the upper metal reinforcing shaft member 50A and the lower metal reinforcing shaft member 50A are connected to each other. Both can resist both compressive force and tensile force acting from the second wooden shaft member 20. Therefore, all the metal reinforcing shaft members 50A located above and below (four in the illustrated example) can resist both the compressive force and the tensile force acting from the second wooden shaft member 20, and the design load in the joint structure can be reduced. It becomes possible to further increase the amount.

[Joining structure of wooden shaft member according to third embodiment]
Next, with reference to FIG. 6, an example of the joint structure of the wooden shaft member according to the third embodiment will be described. Here, FIG. 6 is a perspective view showing an example of the joint structure of the wooden shaft member according to the third embodiment.

In the illustrated joint structure 100B of wooden shaft members, a communicating bolt hole 15 extending from the upper surface to the lower surface is opened in the first wooden shaft member 10, and a long metal reinforcing shaft member 50B is screwed into the communicating bolt hole 15. , is different from the joining structures 100 and 100A in that the upper end surface and lower end surface of the metal reinforcing shaft member 50B are in contact with the second connecting piece 34 and the first connecting piece 31. That is, the communicating bolt hole 15 can be said to be a bolt hole in which the fourth bolt hole 13 and the fifth bolt hole 14 shown in FIGS. 1 to 5 communicate with each other.

In this way, the metal reinforcing shaft member 50B having a length spanning between the opposing sides of the first wooden shaft member 10 is inserted into the communicating bolt hole 15, and the upper and lower end surfaces of the metal reinforcing shaft member 50B are connected to the second connection. By being in contact with the piece 34 and the first connecting piece 31, the common metal reinforcing shaft member 50B can resist both the compressive force and the tensile force acting from the second wooden shaft member 20. Become.

[Joining structure of wooden shaft member according to fourth embodiment]
Next, with reference to FIG. 7, an example of the joint structure of the wooden shaft member according to the fourth embodiment will be described. Here, FIG. 7 is a perspective view showing an example of the joint structure of the wooden shaft member according to the fourth embodiment.

In the illustrated joint structure 100C of wooden shaft members, two first joining fittings 33 are arranged on the opposing upper and lower surfaces of the first wooden shaft member 10, and the first bolt holes 12 of the first wooden shaft member 10 are connected to the upper and lower sides. Mounting bolts 38 are inserted into the second bolt holes 31a of the two first connecting pieces 31, and the upper and lower parts are bolted together. The upper second wooden shaft member 20A and the lower second wooden shaft member 20B are joined to the first wooden shaft member 10 via the upper and lower first joining fittings 33. In this joint structure 100C, the first wooden shaft member 10 is a beam on the upper floor such as the second or third floor (floor beam, inter-story beam, etc.), the upper second wooden shaft member 20A is the upper floor column, and the lower The joint structure is such that the second wooden shaft member 20B is the lower column.

[Fifth embodiment of the joining structure of wooden shaft members]
Next, an example of a joint structure of a wooden shaft member according to the fifth embodiment will be described with reference to Fig. 8. Here, Fig. 8 is a perspective view showing an example of a joint structure of a wooden shaft member according to the fifth embodiment.

In the illustrated joint structure 100D of wooden shaft members, the first wooden shaft member 10 is disposed on a foundation 60 such as a reinforced concrete cloth foundation, and the anchor bolt 38A protruding upward from the foundation 60 is connected to the first wooden shaft. It is inserted into the first bolt hole 12 of the member 10 and the second bolt hole 31a of the first connecting piece 31, and is bolted together. That is, in this joint structure 100D, the first wooden shaft member 10 is a beam of a foundation placed on a foundation 60 such as a cloth foundation, and the second wooden shaft member 20 is a pillar on the first floor. The joint structure is as follows. While effectively utilizing the anchor bolts 38A of the foundation 60, the foundation 60, the wooden beam 10 of the foundation, and the wooden pillar 20 of the first floor are firmly joined.

It should be noted that other embodiments may be adopted in which other components are combined with the configurations listed in the above embodiments, and the present invention is not 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 appropriately determined depending on the application form.

10: First wooden shaft member (wooden beam)
11: Lamina 12: First bolt hole 13: Fourth bolt hole 14: Fifth bolt hole 15: Communication bolt hole 20: Second wooden shaft member (wooden pillar)
20A: Second wooden shaft member (upper floor column)
20B: Second wooden shaft member (lower floor column)
21: Lamina 22: Accommodating groove 23: Second pin hole 24: Bolt/nut housing groove 25: Communicating pin hole 31: First connecting piece 31a: Second bolt hole 32: Fitting member 33: First joining fitting 34: First Two joint fittings (second connection piece)
34a: Third bolt hole 38: Mounting bolt 38A: Anchor bolt 38a: Male screw 38b: Head 39: Tightening nut 40: Metal fixed shaft member 50, 50A, 50B: Metal reinforcing shaft member 51: Female screw 52: Male screw 53: Nut 60: Foundation 100, 100A, 100B, 100C, 100D: Joint structure (joint structure of wood shaft members)

Claims (5)

a first wooden shaft member provided with a first bolt hole through which a mounting bolt passes; and a second wooden shaft member provided with a housing groove into which a portion of the first joint fitting is fitted;
The first joint fitting includes a first connection piece connected to the first wooden shaft member, and a fitting member that stands up from the first connection piece and fits into the accommodation groove,
A second bolt hole is opened in the first connection piece at a position corresponding to the first bolt hole,
The fitting member has a first pin hole through which the metal fixed shaft member is inserted,
It further includes a second joint fitting having only a second connection piece connected to the first wooden shaft member, and a third bolt hole is provided at a position corresponding to the first bolt hole after the second connection piece. was established,
The first joint metal fitting and the second joint metal fitting are arranged on opposing sides of the first wooden shaft member, and the mounting bolt is inserted into the first bolt hole, the second bolt hole, and the third bolt hole. and bolted together.
A second pin hole is further provided in the second wooden shaft member at a position corresponding to the first pin hole when the fitting member is fitted into the accommodation groove,
Joining of wooden shaft members, in which the first wooden shaft member and the second wooden shaft member are joined by inserting the metal fixed shaft member into the second pin hole corresponding to the first pin hole. In structure,
Of the first wooden shaft member, a fourth bolt hole is provided at a location where the first connection piece is disposed, and a fifth bolt hole is provided at a location where the second connection piece is disposed. and
A joining structure for wooden shaft members, characterized in that a metal reinforcing shaft member is embedded in each of the fourth bolt hole and the fifth bolt hole. a first wooden shaft member provided with a first bolt hole through which a mounting bolt passes; and a second wooden shaft member provided with a housing groove into which a portion of the first joint fitting is fitted;
The pair of first bolt holes are arranged at diagonal corners of the second wooden shaft member when viewed in the longitudinal direction of the second wooden shaft member,
The first joint fitting includes a first connection piece connected to the first wooden shaft member, and a fitting member that stands up from the first connection piece and fits into the accommodation groove,
A pair of second bolt holes are opened in the first connection piece at positions corresponding to the pair of first bolt holes,
The fitting member has a first pin hole through which the metal fixed shaft member is inserted,
The two first joining fittings are arranged on opposing sides of the first wooden shaft member, and the mounting bolts are inserted into the first bolt hole and the two second bolt holes to be bolted together,
The second wooden shaft member further has a second pin hole at a position corresponding to the first pin hole when the fitting member is fitted into the accommodation groove,
Joining of wooden shaft members, in which the first wooden shaft member and the second wooden shaft member are joined by inserting the metal fixed shaft member into the second pin hole corresponding to the first pin hole. In structure,
A fourth bolt hole is provided at a location where one of the first connection pieces is disposed in the first wooden shaft member, and a fifth bolt hole is provided at a location where the other first connection piece is disposed. A hole has been opened,
A metal reinforcing shaft member is embedded in each of the fourth bolt hole and the fifth bolt hole ,
The fitting member has a plate shape,
The plate thickness directions of the fitting members of the two first joint fittings are arranged in directions orthogonal to each other,
Joining of wooden shaft members, characterized in that the metal fixed shaft members inserted into the first pin holes of the fitting members of the two first joint fittings are arranged in directions perpendicular to each other. structure. a first wooden shaft member provided with a first bolt hole through which a mounting bolt passes; and a second wooden shaft member provided with a housing groove into which a portion of the first joint fitting is fitted;
The first joint fitting includes a first connection piece connected to the first wooden shaft member, and a fitting member that stands up from the first connection piece and fits into the accommodation groove,
A second bolt hole is opened in the first connection piece at a position corresponding to the first bolt hole,
The fitting member has a first pin hole through which the metal fixed shaft member is inserted,
further comprising a foundation to which the first wooden shaft member is connected;
The mounting bolt is an anchor bolt that extends upward from the foundation,
The first joint fitting and the foundation are disposed on opposing sides of the first wooden shaft member, and the anchor bolt is inserted into the first bolt hole and the second bolt hole and bolted together,
A second pin hole is further provided in the second wooden shaft member at a position corresponding to the first pin hole when the fitting member is fitted into the accommodation groove,
Joining of wooden shaft members, in which the first wooden shaft member and the second wooden shaft member are joined by inserting the metal fixed shaft member into the second pin hole corresponding to the first pin hole. In structure,
Of the first wooden shaft member, a fourth bolt hole is provided at a location where the first connection piece is provided, and a fifth bolt hole is provided at a location where the foundation is provided,
A joining structure for wooden shaft members, characterized in that a metal reinforcing shaft member is embedded in each of the fourth bolt hole and the fifth bolt hole. The joining structure for a wooden shaft member according to any one of claims 1 to 3, wherein the metal reinforcing shaft member is a bolt having a thread groove on its circumferential surface. Claims 1 to 4, wherein the fourth bolt hole and the fifth bolt hole form a communicating bolt hole, and the metal reinforcing shaft member is inserted into the communicating bolt hole. The joint structure of the wooden shaft member according to any one of the items.

Images