JP4561473B2 - Joint structure of large beam and small beam - Google Patents

Description

  The present invention relates to a joint structure of a large beam and a small beam that are bonded using a beam receiver.

  As basic construction types of wooden construction, there are so-called conventional frame construction methods, frame wall construction methods, log construction methods, and the like. In these construction methods, the joint between the large beam and the small beam is joined by a dovetail or the like by cutting the member, or the beam end is supported by the joint metal, and the joint metal and the beam are fixed by a number of nails. The mouth was formed.

  In recent years, in relatively small-scale wooden buildings such as houses, a construction method in which joints are connected with joint hardware has come to be adopted. For example, it is described in Patent Documents 1 and 2, etc. Such a joint structure has been proposed.

This type of joint structure uses a U-shaped or U-shaped beam receiver in top view, and this beam receiver is fixed to the side of the large beam with several bolts, and the beam receiver that protrudes from the side of the large beam. The pair of side plates is inserted into a pair of slits formed in the small beam, a drift pin is inserted into the side surface of the small beam, and the large beam and the small beam are joined. Such a joint structure eliminates the need for complicated processing and assembly as in conventional joints at the joint between the large beam and the small beam, reducing the labor and cost required for construction, and the construction time on site. Can also be shortened. In addition, since a large shearing force can be applied to the joint, there is an advantage that it is possible to form a joint having superior strength and high strength compared to a general conventional frame construction method. there were.
JP-A-8-312006 JP 2002-356717 A

  When the above-described joint structure is employed, depending on the arrangement of beams such as floor beams and eaves beams, the structural requirements may be satisfied even if the beam of the large beam is smaller than the beam of the small beam.

  For example, a plurality of small beams are joined to the large beam in the column direction in the inter-beam direction, and the span split is small. Normally, the distributed load applied to the floor is distributed to the surrounding large beams and small beams, but in the case of the above-mentioned span split, the small beams bear the floor load widely in the inter-beam direction, and than the large beams. It may be necessary to bear a large load. That is, the load borne by the large beam may be smaller than that of the small beam, and as a result, the beam of the large beam can be made smaller than the beam of the small beam.

  However, even if the structural requirements at the joint are satisfied, if the beam length of the large beam is made smaller than the beam size of the small beam, the facet of the small beam will protrude downward from the side surface of the large beam. If there was an opportunity to see such a joint during construction, or if it was finished in the interior, there was a risk of giving residents anxiety and distrust. For this reason, in such joints, even if the structural strength of the beam was not necessary, it had to be devised to make it larger than necessary and align it with the beam of the small beam. . As a result, extra beams are used as much as the beam of the large beam increases, leading to excessive use of wood and high costs.

  Therefore, the present invention has been made in view of the above-mentioned problems, eliminates the distrust and anxiety of residents who may be invited from the appearance without damaging the bonding strength, and overuse of wood. It is an object of the present invention to provide a joint structure of a large beam and a small beam that can be avoided and reduce the material cost.

  In order to achieve the above-described object, the joint structure of a large beam and a small beam according to the present invention is a structure of a small beam coupled to a side surface of a large beam at a joint where the large beam and the small beam are joined using a beam receiver. When the lower end is disposed below the lower end of the large beam, the corner angle formed by the small facet of the small beam and the lower end of the small beam is cut obliquely in accordance with the lower end of the large beam.

  Here, a girder is a structural main frame that spans between columns and is directly connected to these columns. A girder is a column that supports floor boards and joists and transmits loads to the girder. Means a member that is not directly connected to Usually, the large beam has a larger cross section than the small beam. However, in the present invention, the case where the cross section of the large beam is smaller than the cross section of the small beam is preferably implemented.

  According to such an invention, since the lower end of the facet of the small beam is aligned with the lower end of the large beam, the joined part can be formed well without affecting the strength of the joined part. Therefore, excessive use of wood can be avoided and rational beam cross-section design can be performed.

  Further, in the joint structure according to the present invention, it is preferable that the cut surface of the end of the beam is cut so as to form an angle of 45 ° with respect to the lower end of the beam. It can be easily cut and can be formed with good appearance without damaging the structural strength.

  According to the joint structure of the large beam and the small beam according to the present invention configured as described above, it is possible to avoid the excessive use of wood and the resulting high cost, and form an appearance that is not misunderstood as a construction failure, and distrust. A reasonable beam cross-section design can be made without causing a feeling of anxiety or anxiety.

  Hereinafter, the best mode for carrying out the joint structure of a large beam and a small beam according to the present invention will be described with reference to the drawings.

  The joint structure of the large beam and the small beam according to the present invention can make the cross section of the large beam smaller than the cross section of the small beam in terms of structural strength, for example, in a structural frame that can be treated as a ramen structure for strength calculation. The structure can be suitably applied to the case, and is constituted by a single material having a medium cross-section or a small cross-section laminated material, for example.

  FIG. 1 is a perspective view showing an example of the joint structure of the present invention. The end of the large beam 1 is joined to the through pillar 2, and the small face 32 of the small beam 3 is joined to the side surface of the large beam 1. In the illustrated embodiment, the beam of the small beam 3 is larger than the beam of the large beam 1. That is, at the joint between the large beam 1 and the small beam 3, the lower end 31 of the small beam 3 is disposed below the lower end 11 of the large beam 1.

  Therefore, in the joint portion having such a configuration, the inclined surface 34 is formed by obliquely cutting the corner angle 33 formed by the lower end 31 of the small beam 3 and the small face 32 of the small beam 3. As a result, the small face 32 of the small beam 3 becomes small, and the lower side 321 of the small face 32 is aligned with the lower end 11 of the large beam 1.

  In such a joint structure, the bending stress generated in the beam 3 due to the floor load borne by the beam 3 is maximum at the center of the beam 3. Therefore, even if the inclined surface 34 is formed at the end portion of the small beam 3, the structural yield strength is not affected and the strength is not impaired.

  Further, by providing the inclined surface 34 at the joint portion between the large beam 1 and the small beam 3, the small end surface 32 of the small beam 3 that is larger than the large beam 1 protrudes downward from the side surface of the large beam 1. Can be avoided, and a good appearance can be formed. Thereby, it is not necessary to give the resident distrust and anxiety. As a result, it is possible to prevent the material cost from increasing due to excessive use of wood.

  2 to 5 show an embodiment of the joint structure of a large beam and a small beam according to the present invention, FIG. 2 is a longitudinal sectional view showing a joint part of a floor beam partially broken, and FIG. 3 is a cross-sectional view of FIG. FIG. 4 is a longitudinal sectional view showing a joint part of the eaves beam partially cut away, and FIG. 5 is an exploded perspective view of FIG.

  In each cross-sectional view, in order to make the drawings easy to see, hatching indicating a cross-section is omitted from the constituent members such as drift pins and bolts.

  In order to join the small beam 3 to the large beam 1, a beam receiver 4 as illustrated is used. In this type of beam receiver 4, a back plate 41 and a pair of side plates 42 orthogonal to the back plate 41 are formed in a substantially U shape in a top view. The back plate 41 is applied to the side surface of the large beam 1 and fixed by bolts 45. In addition, a pair of slits 35 are formed in parallel at the end of the small beam 3, and a side plate 42 protruding from the side surface of the large beam 1 is inserted into these slits 35. The beam receiver 4 and the small beam 3 are tightly connected by a plurality of drift pins 44 and bolts 45 inserted from the side surface of the small beam 3.

  2 and 3, when the beam of the small beam 3 is larger than the beam of the large beam 1, the corner angle of the small beam 3 is aligned with the lower end 11 of the large beam 1. Is cut so that the small face 32 of the small beam 3 fits into the beam of the large beam 1. The inclined surface 34 formed by cutting is preferably provided so as to form an angle of 45 ° with respect to the lower end 31 of the small beam 3. That is, it is preferable to cut the beam so that the difference a between the beam 1 and the beam 3 is equal to the horizontal cutting length b. Thus, by setting the angle of the inclined surface 34 to 45 °, it can be easily processed without damaging the structural strength, and can be formed with good appearance. In addition, if the inclined surface 34 is 45 ° in this way, the inclined surface 34 is not exposed when the ceiling finish is a folded ceiling, and can be formed with good appearance.

  As shown in FIGS. 4 and 5, the beam of the small beam 3 is larger than the beam of the large beam 1 at the joint of the eaves beam, and the top end 36 of the small beam 3 is higher than the top 12 of the large beam 1. In the same manner as described above, the corner of the small beam 3 is cut in accordance with the lower end 11 of the large beam 1 so that the lower end of the small face 32 of the small beam 3 becomes the lower end 11 of the large beam 1. Try to align. The inclined surface 34 is formed at an angle of 45 ° with respect to the lower end 31 of the small beam 3.

  By cutting the small beam 3 in this way, an appearance that is not misunderstood as a construction failure can be formed at any joint, and a reasonable beam cross-section can be obtained without causing distrust and anxiety of residents. Design can be made possible.

  Note that the joint structure according to the present invention is not limited to the joint joined using the beam receiver 4 having the shape as shown in these embodiments, and the beam is larger in the small beam than in the large beam. Any joint can be suitably implemented as long as it is a joint. Further, the angle of the inclined surface 34 to be formed is not limited to 45 °, and any angle may be used as long as it can be cut without impairing the joint strength.

  At the joint where the small beams that follow the structurally main beam are joined, the uneasiness and distrust of the resident, which is caused by the fact that the beam of the beam is larger than the beam, is reasonable. It can be used as a joint structure of a wooden building that enables beam cross-section design.

It is a perspective view which shows the junction part structure of the big beam and the small beam which concern on this invention. It is one Example of the junction part structure of this invention, and is a longitudinal cross-sectional view which fractures | ruptures and shows a junction part. FIG. 3 is a cross-sectional view of FIG. 2. It is another Example of the junction part structure of the big beam and small beam which concerns on this invention, and is a longitudinal cross-sectional view which partially fractures | ruptures and shows a junction part. FIG. 5 is an exploded perspective view of FIG. 4.

Explanation of symbols

1 Large beam 11 Bottom (large beam)
2 Through column 3 Beam 31 Lower end (beam)
32 Small face 33 Corner angle 34 Inclined surface 4 Beam receiver 41 Back plate 42 Side plate

Claims (2)

  When the lower end of the small beam coupled to the side surface of the large beam is disposed below the lower end of the large beam at the joint where the large beam and the small beam are joined using the beam receiver, A joint structure of a large beam and a small beam, characterized in that the corner angle formed by the lower end of the small beam is cut obliquely so as to match the lower end of the large beam.   The joint structure of a large beam and a small beam according to claim 1, wherein the cut surface is cut so as to form an angle of 45 ° with respect to a lower end of the small beam.

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