JPH11156817A - Building wood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a building wood formed of one natural wood material which is free from cracking and dimensional deviation and has high strength. SOLUTION: A building wood is divided longitudinally into three with a wood core 2 of a boxed timber sandwiched to form wood pieces A, B, C. The middle wood piece B is divided longitudinally into two to pass the core 2 and to cross division faces 3, 4 to separate into pieces B, B', and each pieces A, B, B', C are dried. The division faces are press-integrated through adhesive layers to be recovered into an original form.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to architectural timber such as prisms and cylinders used as pillars and beams.

[0002]

2. Description of the Related Art In order to prevent cracks and cracks, and to ensure dimensional accuracy, it is preferable to use timber that has been naturally dried sufficiently (several years) after logging, but conventionally it requires time-dependent costs. In view of the above, forced drying is usually performed using a dryer. At that time, the cored wood is apt to crack due to the difference in moisture content between the core and the meat. Therefore, a cut is made in advance in one side of the wood in the longitudinal direction (back crack) to facilitate drying. Prevents peripheral cracks and dry cracks.

[0003]

However, the above-mentioned cuts not only increase the size of the opening due to the opening even after drying, but also reduce the strength of the wood, causing a cross-sectional defect. Therefore, they are not used much in recent years when the earthquake resistance is important.

[0004] Therefore, in recent years, structural laminated timbers having a structure in which several kinds of different types of wood are pressure-bonded and integrated via an adhesive have been frequently used. Although this glued lumber does not cause cracks or dimensional irregularities and has the advantage of excellent strength, it has a structure that different kinds of wood are laminated with an adhesive like a parquet work, so that it has a rough appearance. Gives an impression and lacks design. For this reason, a thin plate attached to the surface for the purpose of aesthetics is also used, but the cost is high.

[0005] However, for pillars and horizontal members,
There is a lot of demand for the construction of a single piece of natural wood, and in particular, it has been increasing in recent years, especially in design architectures where wooden frames or braces such as horizontal members are exposed on the top or wall without installing a ceiling plate. High demand. Therefore, an object of the present invention is to provide architectural wood made of a single piece of natural wood which is free from cracks and deviations in dimensions and has excellent strength.

[0006]

In order to solve the above-mentioned problems, in the construction timber of the present invention, first, the cored timber is divided into three parts in the longitudinal direction with a wooden core interposed therebetween, and the divided central piece of wood is
After being divided into two pieces in the longitudinal direction so as to pass through the wooden core and intersect with the divided surface, each piece of wood is dried, and the divided surfaces are pressed and integrated via an adhesive layer to restore the original shape.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention in which a pillar is used for building wood will be specifically described below with reference to the accompanying drawings. (A) to (c) of FIG.
FIG. 2 is a schematic cross-sectional view showing a process of manufacturing the building timber of the present invention, and FIG. 2 is a perspective view of a state where the log in FIG. 1 is divided.

As shown in FIG. 1A, a log 1 is first divided into three pieces in the longitudinal direction with a wooden core 2 interposed therebetween to obtain pieces A, B and C of wood. The central piece of wood B is divided into two pieces of wood B and B 'in the longitudinal direction so as to pass through the wooden core 2 and intersect the dividing planes 3 and 4.

It is important that the above-mentioned three divisions are performed with the wooden core 2 interposed therebetween.
In addition, it is important to divide the middle piece of wood B into two pieces so as to pass through the wood core 2 and intersect with the dividing planes 3 and 4, and usually, as shown in FIGS. And the dividing plane 3,
4 is cut at a plane perpendicular to the plane,
If it intersects with No. 4, it may be cut on diagonal lines as shown by dotted lines or on other lines.

After the log 1 is cut into four parts as described above, each piece of wood A, B, B ', C is dried. Drying is performed sufficiently (with artificial drying or natural drying for 3 to 6 months) until warpage and distortion are eliminated. FIG. 1 (b)
Indicates that each piece of wood is dried and deformed. Normally, the wood pieces B and B 'at the center are curved in either the left or right direction, and the wood pieces A and C are respectively bent outward.

Next, when each piece of wood A, B, B ', C is sufficiently dried, an adhesive is applied to each divided surface,
It is crimped and integrated to restore it to its original shape (FIG. 1 (c)). Examples of the adhesive used include a resorcinol resin, a phenol resin, a melamine / urea co-condensation resin, and a urethane resin. It is preferable to integrate by pressure bonding using a transparent urethane-based adhesive since the bonded portion can hardly be recognized.

According to the architectural timber of the present invention, one piece of timber is divided into four parts around the core, and in particular, the part having a different moisture content from the meat part is divided and dried, so that the interior of the timber is obtained. Sufficient drying can be obtained in a short period of time, and dimensional accuracy and strength equivalent to those of a laminated material can be obtained by pressure-bonding and integrating the divided surfaces via an adhesive layer. Furthermore, the wood restored to its original shape has the same external shape as one natural wood.

[0013]

According to the present invention, it does not cause cracking or dimensional deviation, has excellent strength, and is made of a single piece of natural wood. There is no exterior wood that is no different from natural wood.

[Brief description of the drawings]

1 (a) to 1 (c) are schematic cross-sectional views showing steps of manufacturing a building timber of the present invention from one log.

FIG. 2 is a schematic perspective view of a state in which the log in FIG. 1 is divided.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Log 2 Wood core 3, 4 Division surface A, B, B ', C Wood piece

Claims (1)

[Claims] 1. The cored wood is divided into three pieces in the longitudinal direction with the wood core interposed therebetween, and the divided wood piece is divided into two pieces in the longitudinal direction so as to pass through the wood core and intersect with the divided surface. Thereafter, each piece of wood is dried, and the divided surfaces are pressure-bonded and integrated via an adhesive layer to restore the original shape.