Joint structure of wooden beam

Abstract

To provide a joint structure of wooden beams easily avoiding mutual interference of connectors.SOLUTION: A joint structure of wooden beams comprises: a plurality of wooden beams (beams 30); a wooden core (core 40) end parts of the wooden beams respectively come into contact with; and a connector 70 embedded from the inside of each wooden beam to the inside of the wooden core to join the wooden beams with the wooden core.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a joint structure for a wooden beam. [Background technology]

[0002] Patent Document 1 below shows a joint structure between a first wooden structural member extending along a first axis and a second wooden structural member extending along a second axis. In this joint structure, a precast concrete structural member is disposed between the first wooden structural member and the second wooden structural member. Furthermore, first rods are embedded between the first wooden structural member on both sides of the precast concrete structural member, and similarly, second rods are embedded between the second wooden structural members on both sides of the precast concrete structural member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-62837 Summary of the Invention [Problem to be solved by the invention]

[0004] As shown in the above-mentioned Patent Document 1, when connectors such as rods are arranged across opposing wooden structural members, it is necessary to avoid interference between the intersecting connectors. Therefore, the cross-sectional dimensions of the wooden structural members and the PC structural members must be large enough to allow the intersecting connectors to be arranged overlapping each other. In such cases, the cross-sectional dimensions of the members may become excessively large. Furthermore, if the wooden structural members are not arranged in a straight line, it is difficult to arrange the connectors.

[0005] SUMMARY OF THE INVENTION In consideration of the above, an object of the present invention is to provide a joining structure for wooden beams that can easily avoid interference between connectors. [Means for solving the problem]

[0006] The wooden beam joint structure of claim 1 comprises a plurality of wooden beams, wooden cores to which the ends of the wooden beams are respectively connected, and connectors embedded from the inside of each of the wooden beams to the inside of the wooden cores to join the wooden beams to the wooden cores.

[0007] In the wooden beam joint structure of claim 1, the end of the wooden beam is arranged in contact with the wooden core. The connector that joins the wooden beam and the wooden core is embedded from the inside of the wooden beam to the inside of the wooden core. This leaves only the wooden parts exposed from the outside.

[0008] Since the connectors connect each wooden beam to the wooden core, there is no need to place long connectors that pass through the wooden core between opposing beams, which prevents interference between the connectors. Furthermore, even if the opposing beams are not arranged in a straight line, the connectors can be placed along the axial direction of each beam, making it easy to ensure joint strength.

[0009] The wooden beam joint structure of claim 2 is the wooden beam joint structure of claim 1, wherein none of the multiple wooden beams are arranged on the same straight line, and the fiber direction of the wooden core is along the wooden beam with the greatest stress among the wooden beams.

[0010] In the wooden beam joint structure of claim 2, the fiber direction of the wooden core is along the wooden beam with the greatest stress among the multiple wooden beams. In the wooden core where stress is concentrated from the multiple wooden beams, aligning the fiber direction of the wooden core in the direction of the greatest stress can deal with the stress concentration.

[0011] The joint structure of a wooden beam according to claim 3 is the joint structure of a wooden beam according to claim 1 or 2, wherein the strength of the wooden core is greater than the strength of the wooden beam.

[0012] In the wooden beam joint structure of claim 3, the strength of the wooden core is greater than the strength of the wooden beam, which makes it possible to cope with stress concentration. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a joining structure for wooden beams that easily prevents interference between connectors. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a perspective view showing an example of a frame to which a wooden beam joint structure according to an embodiment of the present invention is applied. [Figure 2] FIG. 1A is a cross-sectional elevation view showing an example of a joint structure between a wooden beam and a wall body according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line BB in FIG. [Figure 3] 1 is a cross-sectional elevation view showing an example of a joint structure between a pillar and a foundation according to an embodiment of the present invention. [Figure 4] FIG. 1A is a plan cross-sectional view showing an example of a joint structure between a beam and a core according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line BB in FIG. [Figure 5] 1 is a cross-sectional view showing an example of a connector according to an embodiment of the present invention. [Figure 6] 1 is a perspective view showing an example of a method for installing a connector according to an embodiment of the present invention. [Figure 7] FIG. 10 is a perspective view showing a modified example of the connector according to the embodiment of the present invention. [Figure 8] FIG. 10 is a perspective view showing another modified example of the connector according to the embodiment of the present invention. [Figure 9] FIG. 10 is a plan view showing an example of a joining angle of a beam to a core according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, a wooden beam joint structure according to an embodiment of the present invention will be described with reference to the drawings. Components indicated by the same reference numerals in each drawing are the same components. However, unless otherwise specified in the specification, each component is not limited to one, and may be present in multiple numbers.

[0016] Furthermore, descriptions of overlapping configurations and symbols in each drawing may be omitted. Note that the present disclosure is not limited to the following embodiments, and may be implemented by making appropriate modifications, such as omitting configurations, replacing them with different configurations, or combining one embodiment with various modified examples, within the scope of the purpose of the present disclosure.

[0017] <Frame> 1 shows a frame 10 to which a wooden beam joint structure according to an embodiment of the present invention is applied. The frame 10 is a column-beam frame formed of columns 20 and beams 30.

[0018] The columns 20 are wooden columns. A core 40 is joined to the upper end of at least some of the columns 20. The lower end of the columns 20 is fixed to the foundation 60. The beams 30 are wooden beams that span between the columns 20.

[0019] The ends of at least some of the beams 30 are joined to the core 40. Specifically, the ends of the beams 30 that span the columns 20 to which the cores 40 are joined are joined to the cores 40. The cores 40 are wooden joint members. As will be described in more detail later, multiple beams 30 are joined to one core 40.

[0020] The columns 20 and beams 30 are made of, for example, laminated cedar lumber, and the core 40 is made of laminated larch lumber. In the present invention, it is preferable that the strength of the core 40 (for example, bending strength, compressive strength, and shear strength) is greater than the strength of the beams 30.

[0021] A portion of the beam 30 is supported by a wall 50. The wall 50 is a bearing wall made of reinforced concrete, and its lower end is fixed to a foundation 60. Note that, in the present invention, the wall 50 is not necessarily required.

[0022] (Beam and wall joint structure) As shown in FIGS. 2A and 2B, some of the beams 30 are placed on a wall 50 and fixed to the wall 50 by connecting members 52, drift pins 54, and tension bolts 56.

[0023] The wall body 50 is disposed so that its in-plane direction is along the axial direction of the beam 30, and is disposed directly below the beam 30. A joining member 52 is fixed to the upper end of the wall body 50.

[0024] The joining member 52 includes a base plate 52A, a stud 52B, and a joining plate 52C.

[0025] Base plate 52A is a steel plate arranged along the upper end surface of wall body 50, and is arranged so that its upper surface is flush with the upper surface of wall body 50. Studs 52B are welded to the underside of base plate 52A, protrude downward, and are embedded in wall body 50. Joining plate 52C is a steel plate whose in-plane direction is vertical and aligned with the axial direction of beam 30, and has through holes H1 formed therein.

[0026] 2(B), an insertion hole into which the joining plate 52C is inserted is formed in the beam 30. An insertion hole H2 communicating with the through hole H1 of the joining plate 52C is also formed in the beam 30. A drift pin 54 is inserted into the insertion hole H2 and the through hole H1.

[0027] The lower end of a tension bolt 56 is embedded in the wall 50. The tension bolt 56 protrudes upward from the upper end surface of the wall 50, is inserted into a through-hole that passes through the beam 30 in the vertical direction, and is fixed to the wall 50 with a nut.

[0028] (Column-foundation joint structure) As shown in FIG. 3, the lower end of the column 20 is fixed to a foundation 60 using a base member 22, an anchor bolt 24, and a drift pin 26.

[0029] The base member 22 is configured to include plates 22C and 22D, a support rod 22A, and a fixing rod 22B.

[0030] Plates 22C and 22D are plates that fit along the upper surface (horizontal surface) of foundation 60, and are arranged spaced apart in the vertical direction via support rods 22A. Lower plate 22C is fixed to foundation 60 by anchor bolts 24. Fixed rod 22B that protrudes upward is fixed to upper plate 22D.

[0031] The support rods 22A are members whose lower ends are fixed to plate 22C and whose upper ends are fixed to plate 22D, and there are four of them provided: two arranged in the left-right direction of the paper in Figure 3, and two (not shown) arranged in the depth direction of the paper from the two earlier ones.

[0032] The fixing rod 22B fixed to the plate 22D has a through hole H3 formed therein. Two through holes H3 are formed along directions that intersect with each other.

[0033] An insertion hole into which the fixed rod 22B is inserted is formed in the pillar 20. Also, an insertion hole H4 communicating with the through hole H3 of the fixed rod 22B is formed in the pillar 20. A drift pin 26 is inserted into the insertion hole H4 and the through hole H3.

[0034] (Beam and core joint structure) As shown in Figures 4(A) and (B), the end faces of multiple beams 30 are arranged in contact with the core 40. The multiple beams 30 are arranged radially relative to the core 40. The core 40 and the beams 30 are joined using connectors 70 and grout material. As will be described in more detail later, the grout material is filled into the connectors 70 from the direction indicated by the arrows in these figures.

[0035] An insertion hole 30A into which the connector 70 is inserted is formed in the end face of the beam 30. The insertion hole 30A is a bottomed hole that extends along the axial direction of the beam 30. A method for inserting the connector 70 into the insertion hole 30A will be described later.

[0036] An insertion hole 40A into which the connector 70 is inserted is formed on the side surface of the core 40. The insertion hole 40A is also a bottomed hole that extends along the axial direction of the beam 30. The insertion hole 30A and the insertion hole 40A are in communication with each other and are arranged in a straight line.

[0037] The connectors 70 are inserted into the insertion holes 30A and 40A, and are thereby embedded from the inside of the beams 30 to the inside of the core 40. The connectors 70 are provided for each beam 30 and do not penetrate the core 40. In other words, the ends of the connectors 70 are disposed inside the core 40.

[0038] 4(B), the core 40 also has an insertion hole 40A formed in the lower end surface that is joined to the pillar 20. Similarly, the pillar 20 has an insertion hole 20A formed in the upper end surface thereof, into which the connector 70 is inserted.

[0039] (Connector and insertion hole structure) As shown in Figure 5, connector 70 is a hollow tubular body that includes a main pipe 72 and a branch pipe 74. Main pipe 72 is a cylindrical body with an opening 72H formed at one end. Opening 72H is formed at the end of main pipe 72 that is inserted into insertion hole 40A. Branch pipe 74 is a cylindrical body with one end connected to main pipe 72 and the other end with opening 74H formed therein.

[0040] A main pipe 72 of a connector 70 is inserted into the insertion hole 30A. A branch hole 30B in which a branch pipe 74 is disposed is formed in the beam 30, and the insertion hole 30A and the branch hole 30B are in communication with each other.

[0041] 6, branch pipe 74 and main pipe 72 are configured to be detachable from each other. For example, if opening 73H is formed in main pipe 72 and threads are formed at opening 73H and the tip of branch pipe 74, branch pipe 74 and main pipe 72 can be made detachable from each other.

[0042] When the connector 70 is formed in this manner, the main pipe 72 is inserted into the insertion hole 30A, and the branch pipe 74 is inserted through the branch hole 30B, so that the branch pipe 74 can be disposed within the branch hole 30B.

[0043] In this embodiment, the branch pipe 74 is formed in the connector 70, but the embodiment of the present invention is not limited to this. For example, as shown in Fig. 7, the connector 70 may be formed only by the main pipe 72, and an opening 73H may be formed in the side surface of the main pipe 72.

[0044] According to this aspect, it is sufficient to form a through hole 30E in the beam 30, which communicates with the insertion hole 30A from the side surface of the beam 30. Then, the tip of a jig for injecting grout material is inserted into the through hole 30E and the opening 73H, and the grout material is injected.

[0045] 8, a groove 30D is formed in the beam 30 to allow the branch pipe 74 to pass through when inserting the connector 70. The groove 30D communicates with the insertion hole 30A and opens to the end face and side face of the beam 30.

[0046] After the connector 70, in which the branch pipe 74 and the main pipe 72 are integrated, is placed in the insertion hole 30A, the plug 30C is placed in the groove 30D. The plug 30C is placed in the groove 30D except for the portion where the branch pipe 74 is placed. This forms the branch hole 30B shown in Figure 5.

[0047] (Grout injection) 5, with connector 70 positioned across insertion holes 30A and 40A, a gap V is formed between the outer periphery of main pipe 72 and the inner periphery of insertion hole 30A and the inner periphery of insertion hole 40A. This gap V communicates with the gap between the outer periphery of branch pipe 74 and the branch hole 30B and the inner periphery of branch pipe 74.

[0048] Then, by injecting grout material into the branch pipe 74 of the connector 70 through the opening 74H, the grout material flows through the branch pipe 74 toward the opening 72H at the end of the main pipe 72. The grout material then flows from the opening 72H toward the gap V and finally overflows from the branch hole 30B. The worker visually checks the overflowing grout material to complete the grout injection work. This joins the beam 30 and the core 40 with the connector 70 and the grout material.

[0049] (Beam joint angle) In the frame 10, the angle at which the beams 30 are joined to the core 40 is not particularly limited, but in the example shown in Figure 4(A), none of the multiple beams 30 joined to the core 40 are arranged on the same line.

[0050] 9, the angle between the two beams 30 (beams 30N and 30S) with the largest angle among the multiple beams 30 joined to the core 40 is shown as angle θ1. The angle whose sum with angle θ1 is 180° is shown as angle θ2.

[0051] Of the beams 30 connected to the core 40, the bending stress acting on the beams 30N and 30S is greater than the bending stress acting on the other beams 30. In other words, the beams 30N and 30S are the beams with the greatest bending stress.

[0052] Therefore, the fiber direction of the laminated lumber forming core 40 is set to be the direction along beams 30N and 30S. Specifically, the fiber direction of the laminated lumber forming core 40 is set to be within the range from the direction along beam 30N (dotted chain line CL1) to the direction along beam 30S (dotted chain line CL2). In other words, the fiber direction of the laminated lumber forming core 40 is shifted from the direction along beam 30N by an angle of 0° or more and θ2° or less toward the direction along beam 30S.

[0053] <Action and effect> In the wooden beam joint structure according to the embodiment of the present invention, as shown in Figures 4(A) and 4(B), the end of the wooden beam 30 is arranged in contact with the wooden core 40. The connector 70 that joins the beam 30 and the core 40 is embedded from the inside of the beam 30 to the inside of the core 40. As a result, only the wooden parts are exposed at the joint between the beam 30 and the core 40 from the outside.

[0054] Because the connectors 70 join each beam 30 and the core 40, there is no need to arrange a long connector that passes through the core 40 between the opposing beams 30, and interference between the connectors 70 can be avoided. Furthermore, even if the opposing beams 30 are not arranged in a straight line, as shown in Fig. 4(A) etc., the connectors 70 can be arranged along the axial direction of each beam 30, making it easy to ensure joining strength.

[0055] In the joint structure of the wooden beam according to the embodiment of the present invention, as explained using Fig. 9, the fiber direction of the laminated wood forming the core 40 is the direction along the beam 30 with the greatest bending stress among the multiple beams 30. In the core 40 where bending stress is concentrated from the multiple beams 30, the fiber direction of the core 40 is aligned with the direction in which the bending stress is greatest, thereby making it possible to deal with the stress concentration.

[0056] Furthermore, in the joint structure of the wooden beam according to the embodiment of the present invention, the bending strength of the core 40 is greater than the bending strength of the beam 30. This makes it possible to cope with stress concentration.

[0057] <Other embodiments> In the above embodiment, an example has been described in which the multiple beams 30 joined to the core 40 are not arranged on the same straight line, but the embodiment of the present invention is not limited to this. The multiple beams 30 may be arranged on a straight line.

[0058] Furthermore, in the above embodiment, the fiber direction of the core 40 is set to be along the beam 30 with the greatest bending stress among the beams 30 joined to the core 40, but the embodiment of the present invention is not limited to this, and the fiber direction of the core 40 is not particularly limited.

[0059] In addition, in the above embodiment, the core 40 and the beams 30 are formed using laminated timber, but the present invention is not limited to this. The material from which the core 40 and the beams 30 are formed is not particularly limited as long as it is a wood material.

[0060] In each of these embodiments, interference between the connectors 70 can be suppressed by providing a connector 70 for each beam 30. As described above, the present invention can be embodied in various embodiments. [Explanation of symbols]

[0061] 20 wooden pillars 30 Beam (wooden beam) 40 core (wooden core) 70 Connector

Claims

1. Several wooden beams and a wooden core to which the ends of the wooden beams are respectively in contact; a connector embedded from the inside of each wooden beam to the inside of the wooden core, and connecting the wooden beam and the wooden core; Equipped with Jointed structure of wooden beams.

2. The plurality of wooden beams are not arranged on the same straight line, The fiber direction of the wooden core is Among the wooden beams, the direction along the wooden beam with the greatest stress, The wooden beam joint structure according to claim 1.

3. The strength of the wooden core is greater than the strength of the wooden beam; The wooden beam joint structure according to claim 1 or 2.

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