JP3056696B2 - Method of strengthening joining of wooden structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for strengthening the joining of a wooden structure, and more particularly to a method for strengthening the joining between wooden building materials using an adhesive.

[0002]

2. Description of the Related Art Wood, which is a wood-based material, has high strength in spite of its light weight, is easy to process such as cutting, cutting, and piercing. It has many advantages such as easy availability and is widely used as a material for building structures such as dwellings. The joining of wooden building materials such as columns and foundations, columns and girders, columns and beams, etc. in a wooden structure is a traditional Japanese method called “mortise”.
A method of providing (joint portions provided at the ends of the building material) and "mortise holes" (recessed portions provided in the building material and into which a tenon is inserted) and joining them together has become widespread. For this reason, "Kasugai", nails, bolts and nuts, L-shaped fittings and the like are used as reinforcing means.

However, wood-based building materials have a fibrous structure composed of various cells, and most of the cells are composed of cell membranes and cell cavities, and there are intercellular spaces between cells. Have. The hole at the place where the above-mentioned reinforcing joining means `` Kasugai '' or nails are pierced,
It gradually increases due to secular change due to drying, an earthquake, micro-vibration at the time of vehicle traffic, etc., and the connecting means is loosened. As a result, there is a high risk that a large earthquake will cause the building to collapse. In other words, from the characteristics of the wooden building materials,
It can be said that the physical joining means has a limit. Therefore, a method of applying an adhesive is also practiced, but there is also a problem with ordinary adhesive application because the adhesive does not spread to every corner of the gap between the joints by simply applying the adhesive.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to eliminate the above-mentioned problems of the prior art, and an object of the present invention is to provide a joint of a wooden structure, particularly a wooden building material using a tenon. It is an object of the present invention to provide a joint strengthening method that can easily and surely strengthen joints at joints between them and at the same time, does not impair the appearance of a building as much as possible.

[0005]

SUMMARY OF THE INVENTION In short, the method of the present invention comprises:
Penetrating through the gap at the joint of the tenon of wood-based building materials
Providing a small hole to be made in the wooden building material;
Of the adhesive at a pressure of 4 to 9 kg / cm 2 through the small holes.
Flow gun or caulking gun or high
Press in using a pressure pump gun to cure the adhesive.
A bonding enhancement method woody structure characterized by comprising the that step.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. FIG. 1 is an explanatory view of a vertical section showing a joint between a pillar and a base. FIG. 2 is an enlarged view of the joint in FIG. As shown in FIG. 1, in the case of a wooden building having a wooden structure, a wooden base 2 is usually fixed on a foundation concrete 4 by anchor bolts 5.

[0007] As shown in FIGS. 1 and 2, the wooden pillar 1 and the base 2 are joined by a “mortise” (projection) 11 provided at the lower end of the pillar 1. Is formed by fitting into a “mortise” (recessed portion) 21 provided in the hole. As shown in FIG. 2, in consideration of the expansion and contraction of the pillar 1 due to the change in humidity and the aging of the material, etc.
The lower surface 11a of the mortise and the bottom surface 21a of the mortise 2 are not in contact with each other.
Is provided.

Further, as shown in FIG. 2, there is a slight gap 10b between the tenon side 11b and the tenon side 21b from the beginning of construction, and the wood gradually dries and shrinks due to aging. The gap 10b gradually expands. In the bonding strengthening method of the present invention, an adhesive is injected into every corner of the gaps 10a and 10b and hardened to strengthen the bonding.

The method of strengthening the bonding will be described below in the order of steps. (First Step) As shown in FIGS. 1 and 2, a small hole 3 penetrating through a gap 10a between the lower surface 11a of the tenon and the bottom surface 21a of the tenon on the side 22 of the base 2 using a drill or the like. Is provided. When the outer wall 5 is provided, a hole may be provided from the outer wall. In addition, the diameter of the small hole 3 to be provided is preferably about 13 to 15 mm from the viewpoint that the appearance of the building is not impaired as much as possible and in consideration of the general size of the gap 10a.

(Second Step) As shown in FIGS. 1 and 2,
Small holes 3 to 4 to 9 kg / cm ² , preferably 6 to 7 kg
The adhesive is pressed into the gap 10a with a pressure of / cm ² .
For the press-fitting, high-pressure injection is performed using a so-called flow gun in which an adhesive is sent to a hose by a pressure pump and extruded from a nozzle hole at the tip of the gun, a so-called caulking gun for extruding the adhesive by air pressure, a high-pressure pump gun, or the like.

By injecting the adhesive at the above high pressure, the adhesive reaches not only the gap 10a but also every corner of the gap 10b, which is a narrow gap, and at the same time, the adhesive is applied to the fiber near the surface of the column 1 or the base 2. It penetrates into the material, and after hardening, it can achieve strong bonding. Therefore, 4 kg / cm ²
If the pressure is lower than the above, it is not preferable because the adhesive does not sufficiently spread to every corner of the gap portion. On the other hand, if the pressure exceeds 9 kg / cm ² , the pressure is too high and the repulsive force is large, which hinders the work. Especially when working on high places using ladders,
It is not preferable because it leads to danger such as falling of the worker.

Adhesives include vinyl acetate (vinyl acetate emulsion, vinyl acetate solution), phenol, resorcinol, phenol / resorcinol, epoxy, urea, melamine, and vinyl urethane wood-based materials. Are used, and among them, vinyl acetate emulsion is preferable. Of these, a room temperature-curable adhesive such as a vinyl acetate emulsion cures at room temperature, so that it is only necessary to leave it after press-fitting.

(Third Step) When the small holes 3 are formed in the outer wall 5, after the adhesive is injected, a vinyl chloride cap (lid) is used to maintain the appearance of the appearance and to prevent rainwater and dust from entering. )
(Not shown) and the operation is completed.

In the above embodiment, the method of strengthening the joint between the column and the base has been described. However, the method of the present invention is not limited to this, and the column and the beam, the column and the trunk, the beam and the beam, the column and the beam, etc. It can be widely applied to joints between wooden building materials in general, that is, joints having a wooden structure. In addition, even in the case of the joint using a method other than the method of fitting a tenon in the above embodiment (for example, a nail, a bolt, etc.), since the joint of the wooden structure usually has a small gap, the present invention is not applicable. Inventive method can be applied

FIG. 3 is a front view of a wooden building, and illustrates a joint to which the method of the present invention can be applied. That is, a small hole 3 is formed at the joint between the column 1 and the base 2 and between the column 1 and the trunk 8.
a or the small hole 3b is provided and the adhesive is press-fitted to strengthen the bonding. In FIG. 3, the small holes 3a are constructed from outside the building, and the small holes 3b are constructed from above the ceiling. When a small hole is formed in the outer wall 7, a vinyl chloride cap (lid) 30 of the same color as the outer wall is used to maintain the appearance of the appearance and to prevent intrusion of rainwater and dust. Cover. Further, the method of the present invention is suitably implemented as a means for strengthening the structure of a wooden building that has been passed for a considerable number of years after construction. However, it is needless to say that the method can also be applied as a means for strengthening the structure of a wooden building that is being newly constructed.

[0016]

【The invention's effect】

(1) Since the adhesive is press-fitted at a high pressure, the adhesive spreads to every corner of a slight gap portion of the joint, and the joining can be surely strengthened, and the joining is more remarkable than the conventional reinforcing means such as fading. Achieve reinforcement. For example, in the case of strengthening with one haze, the tensile strength is about 200 kg per column, and in the strengthening method according to the present invention, 500 kg is about 2.5 times better. Therefore, the building can be prevented from collapsing even in a large earthquake such as a severe earthquake accompanied by pitching.

(2) Since the operation can be performed without removing the outer wall and the like from the outside of the building, the operation can be performed simply and at low cost. (3) No special construction is required only by making a small hole in the outer wall or the like, and the appearance of the building is not damaged.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a vertical cross section showing a joint between a pillar and a base.

FIG. 2 is an enlarged view of a joint in FIG.

FIG. 3 is a front view of a part of a wooden building.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pillar 2 Base 3 Small hole 3a Small hole 3b Small hole 4 Foundation concrete 5 Anchor bolt 6 Ground 7 Outer wall 8 Body insertion 9 Roof 10a Gap part 10b Gap part 11 Mortise 11a Mortise lower surface 11b Mortise side 21 Mortise hole 21a Mortise hole Bottom surface 21b Mortise side surface 22 Base side 30 Vinyl chloride cap (lid)

Claims (3)

(57) [Claims] 1. A space at a joint of a tenon portion of a wooden building material.
Providing a small hole penetrating the gap portion in the wooden building material
And an adhesive for woody materials at a pressure of 4 to 9 kg / cm2.
Flow gun or caulking from the small hole to the gap
Press in using a gun or high pressure pump gun to
Curing the Chakuzai, bonding enhancement method of woody structures characterized by Tona Rukoto. 2. The method according to claim 1, wherein the adhesive for the wood-based material is press-fitted at a pressure of 6 to 7 kg / cm 2. 3. The method according to claim 1, wherein the adhesive for the wood-based material is a vinyl acetate emulsion.