JPH0810088Y2 - Structure of timber joint in building structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to the structure of a wood joint in a building structure, in particular, a convex portion at one end of a horizontal member and a side portion of the other horizontal member. The present invention relates to a structure of a wood joint portion in a building structure in which concave portions are respectively machine pre-cut, and the convex portions are fitted into the concave portions to horizontally join both horizontal members in a T-shape.

[Prior Art] Recently, in order to improve the precision and labor saving of building structural materials,
Machine pre-cut processing is performed, and when the convex part of the end of one horizontal member is fitted into the concave part of the side of the other horizontal member, both horizontal members are joined in a T-shape horizontally. It is also used for processing both horizontal materials.

[Problems to be Solved by the Invention] In the mechanical pre-cutting process, since a completely uniform process is performed, some wood may partially or wholly damage the fibers in the part close to the processed surface.

Also, in mechanical precutting, little consideration is given to partial differences in wood, such as hard or soft parts, and the presence or absence of knots, so even if a uniform processed shape can be obtained, it is possible to achieve local processing at the joint. There is a problem in that a portion where stress is concentrated is easily generated (for example, stress is concentrated in a hard portion), which may cause local damage.

The present invention has been made in order to solve such a problem, and it does not cause local damage even if the convex portion and the concave portion of the horizontal member to be joined in a T-shape are mechanically pre-cut, and thus the proof stress is not increased. It is intended to provide a structure of wood joints in large building structures.

[Means for Solving the Problems] In order to achieve the above object, the present invention mechanically pre-cuts a convex portion on an end portion of one horizontal member and a concave portion on a side portion of the other horizontal member. In a structure of a wood joining portion in a building structure in which the convex portion is fitted in the concave portion and both horizontal members are joined in a T shape horizontally, the thin metal plate having an outer surface matching the shape of the concave portion is formed into the concave portion. And the convex portion is interposed at the joint portion.

[Operation] A thin sheet metal product having an outer surface that matches the shape of the recess has a function of dispersing and transmitting the concentrated stress to the recess even if the concentrated stress is locally applied from the protrusion, and the recess is locally damaged. Without being done, the strength or shear strength of the entire joint is improved.

[Embodiment] An embodiment of the present invention will be described below with reference to a timber joint portion in a T-shaped joint construction structure shown in the drawings.

FIG. 1 and FIG. 2 show a perforated dovetail joint, which is the most basic structure in T-shaped joining, and a convex portion 2 is formed by mechanical precutting at the end of one horizontal member 1 which is a hanging tree. Then, the concave portion 4 corresponding to the convex portion 2 is formed on the side portion of the other horizontal member 3 to be the receiving tree by the mechanical pre-cutting process, and the convex portions 2 are fitted into the concave portion 4 on both the horizontal members 1 and 3. They are joined by joining. The convex portion 2 has a male part for sitting down.
2a and ant male part 2b are formed in stages, and correspondingly,
In the concave portion 4, a sitting female portion 4a and a dovetail female portion 4b are formed.

A thin sheet metal article 5 is interposed between the convex portion 2 and the concave section 4, and the outer shape of the thin sheet metal article 5 matches the shape of the concave section as shown in FIG.

The thin metal plate 5 is formed by pressing a steel plate, but a complicated shape having the dovetail part 5b can be manufactured by separately forming only the dovetail part 5b and then welding. Further, the thin metal plate 5 may be fixed to the recess 4 by a fixing means such as an adhesive for the purpose of increasing the strength.

The load W applied to the horizontal member 1 at the joint is
When the load W concentrates on one point (reaction force P ′) as shown in FIG. 4 while being supported by the stool female portion 4a, the stool female portion 4a is locally damaged at that portion. Will be done. However, when the thin sheet metal article 5 integrated with the stool female portion 4a and the dovetail female portion 4b is fitted, as shown in FIG. 3, the load W is dispersed and received due to the rigidity of the thin sheet metal article 5. (Vertical reaction force: P ₁ + P ₂ + ・
.. + P _i-1 and P _i + P _{i + 1} + ... + P _n ).

Therefore, the convex portion 2 is formed by the mechanical precut processing, and even if the hard portion is locally present in the convex portion 2, the concave portion 4 is not locally damaged, and the surface of the concave portion 4 is formed by the mechanical precut processing. Even if some of the fibers are damaged, it is possible to compensate for the decrease in the shear strength of the concave portion 4 due to the damage.

Since the thin metal plate 5 is processed in accordance with the shape of the concave portion 4, it has a large number of bent portions, and the convex portion 2 is formed in the void.
Therefore, in the case of joining in a normal building structure, a thickness of about 1 mm has sufficient rigidity and there is no fear of deformation, but a thickness of several mm depending on the material of the wood, the scale of construction, etc. May be required.

Another effect of the thin metal plate 5 is that the friction resistance between the horizontal member 1 and the convex portion 2 when the horizontal member 1 is fitted into the concave portion 4 is small, and the assembling thereof is easy.

[Effect of the Invention] According to the present invention, a thin metal plate having an outer shape that matches the shape of the recess on the side of the horizontal member is interposed between the recess and the protrusion of the end of one horizontal member. Therefore, localized concentrated stress from the convex part can be dispersed and transmitted to the concave part, and even if the machine pre-cut processing that does not consider the partial difference in the material of the wood, the entire joint part is It is possible to improve the strength or shear proof strength on average. Therefore, the safety of the joint portion of the wood subjected to the mechanical pre-cut processing can be extremely enhanced.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part of a wood joining portion showing an embodiment of the present invention, FIG. 2 is an exploded perspective view of the wood joining portion, and FIG. 3 is an explanatory view of a load supporting state of the wood joining portion. FIG. 4 is an explanatory view of a load supporting state of a conventional wood joining portion. 1,3 …… Horizontal material, 2 …… Convex part, 2a …… Sit male part, 2b
...... Ant male part, 4 ...... recessed part, 4a ...... sit female part, 4b ...
… Ant female part, 5 …… Sheet metal part, 5a …… Sit female part, 5b
…… Arimes part.

Claims (1)

[Scope of utility model registration request] 1. A horizontal pre-cut material is formed by mechanically pre-cutting a convex portion on one end of one horizontal member and a concave portion on the side of the other horizontal member, and fitting the convex portion into the concave portion. In the structure of the timber joint portion in the T-shaped horizontal joint structure, a thin metal plate having an outer shape matching the shape of the recess is interposed at the joint between the recess and the protrusion. Structure of timber joints in structure.