JP2002086415A - Method for manufacturing square bar for pillar or foundation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a square bar for a pillar or a foundation wherein the square bar for the pillar or the foundation which has a wood pattern having a natural feeling in the same way as a traditional core-holding square bar sawn from a log, suppresses cracks on a surface and inside and is excellent in a decorative property and strength, can be economically manufactured. SOLUTION: A core-having square bar 2 sawn from a log 1 is divided by a surface 22 containing a core 21 to make two pieces of divided bars 3 and 3. After respectively drying both divided bars 3 and 3, makeready working is applied to at least divided surfaces 31 and 31 in each of both divided bars 3 and 3. Then, the divided surfaces 31a and 31a to which makeready working is applied are bonded to each other via an adhesive by using a press device and both divided bars 3 and 3 are integrated with each other to provide the method for manufacturing the square bar for the pillar or the foundation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a pillar or a base material for a pillar or a base material capable of manufacturing a pillar or a base material having excellent design and strength.

[0002]

2. Description of the Related Art
BACKGROUND ART As a timber used for a pillar or a base for a house, a timber made of a straight and sufficiently thick log, which has been naturally dried over a period of time, has been widely used. Since such a pillar or a base material for a base is lumbered avoiding a core of a log, two or four faces have a straight grain.

However, in recent years, it has become difficult to obtain a sufficiently thick log. Therefore, a thin log is sawn so that the outer periphery thereof is cut off to obtain a square material including a core of the log, and this is used for housing. Used for prisms or bases. It is also possible to remove wood from lumber products that have many defects and remove them to obtain wood without defects, and obtain narrow and short wood products, and glue them vertically and horizontally to use glued laminated timber for housing prisms or foundations. Have been done.

[0004] However, a prism or a base manufactured from a thin log so as to include a core has a problem that when it is dried, cracks occur on the surface and inside, and the design and strength deteriorate. In addition, the prism or base obtained from the glued laminated lumber could solve the problem of cracking due to drying, but it was inferior in design because it was made by bonding narrow and short materials, and a decorative veneer was attached to the outer periphery to supplement it However, in this case, there is a new problem that the cost is increased.

[0005] Accordingly, an object of the present invention is to provide a design and strength having a natural wood pattern similar to that of a conventional squared lumber made from a log, and in which cracks on the surface and inside are remarkably suppressed. It is an object of the present invention to provide a method for manufacturing a pillar or a base material, which can economically manufacture a pillar or a base material having an excellent shape.

[0006]

SUMMARY OF THE INVENTION According to the present invention, there is provided a method for dividing a cored square lumber made from a log into two divided members by dividing the surface with a core into two divided members. Uneven processing is performed on at least the divided surfaces in each, and then, the divided surfaces subjected to the uneven processing are bonded to each other with an adhesive using a pressing device to integrate both divided materials. The above object has been achieved by providing a method for producing a pillar or a square material for a base.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on preferred embodiments. FIG. 1 is a view for explaining each step in one embodiment of the present invention, and FIG. 2 is a perspective view showing an example of a column or a base material obtained by the method of this embodiment shown in FIG. It is.

In the present embodiment, as shown in FIGS. 1 (a) and 1 (b), a mandrel square 2 made from a log 1 is used as a raw material. Various known methods can be used as a method of sawing the cored timber 2 from the log 1. In the present embodiment, the log 1 is divided into four planes parallel to its center line using a twin saw. S1-S
4, and the obtained square rod 2 having a square cross section obtained.
Is used as a raw material. The cantilever square bar used in the present invention may have a square cross-section or a rectangular cross-section, and its cross-sectional dimension may be appropriately determined according to the size of the target pillar or base square bar. As an example, a rectangular object having a square with a short side of 105 to 120 mm and a long side with a length of 240 to 360 mm can be cited as an example.

Next, as shown in FIGS. 1 (b) and 1 (c), the cored square bar 2 made from the log 1 is divided by a surface 22 including a core 21 to form two divided members 3 and 3. I do. As a means for dividing the cored square member 2, various known devices capable of cutting the square member 2 along its longitudinal direction can be used, and for example, a band saw, a circular saw, or the like can be used. Among these, a band saw is preferable. The cored square bar 2 in the present embodiment has a core (a log tree core) 21 at the center of the cross section along the longitudinal direction of the square bar 2. The cored square bar 2 is cut on a plane 22 which passes through the center point of the cross section and is perpendicular to each of a pair of opposing side surfaces and parallel to the other pair of side surfaces.

Next, as shown in FIG. 1D, the obtained two divided members 3 and 3 are separated from each other and dried. At the time of drying, it is preferable that the two divided materials are simultaneously dried in the same drying chamber. Split wood 3,
As the drying method 3, various methods conventionally known as a method for drying wood can be used without particular limitation.
Natural drying or artificial drying may be used, or a method combining both may be used. As a preferable artificial drying method, there is a method of drying by placing it in a drying device capable of controlling temperature and humidity. As a method of using artificial drying and natural drying in combination, a method of preliminary performing natural drying before artificial drying can be exemplified. By performing preliminary natural drying, the energy cost of the drying step can be suppressed.

It is preferable to dry the divided materials 3 and 3 so that the moisture content of each of the divided materials 3 and 3 is 15% or less. By drying until the water content becomes 15% or less, the adhesiveness between the two divided materials can be improved, and especially when the material is dried to 12% or less, particularly for columns or foundations having excellent strength. Can be obtained. However, if the material is excessively dried, the material is greatly deformed and the risk of internal cracks is increased. Energy costs also rise. Therefore, the water content after drying is preferably 8% or more, and from the viewpoint of achieving both good adhesiveness and energy cost, the water content after drying is 8 to 15%, particularly 8%.
It is preferably about 12%.

Here, the moisture content of the divided material is measured as follows. The central part in the longitudinal direction of each divided material after drying is cut into a width of 30 mm to form a sample, and the weight W1 of the sample is measured. Next, the sample was subjected to JIS Z
2201. Wood Test Method According to the method for measuring the water content, the wood is left at 105 ° C. in a dryer, and the weight W2 after the sample reaches a constant weight is measured. Then, the water content is determined by the following equation. Water content (%) = (W1-W2) / W2 × 100

In the present invention, since the cored squared bar 2 is divided and dried instead of being dried as it is, the occurrence of cracks on the surface or inside of the bar is remarkably suppressed. Thus, it is possible to obtain a pillar or a base material having excellent appearance and strength. In addition, when the undried core-bearing square timber 2 is dried as it is, especially in the case of cedar wood, the water content of the core material including the core is 75 to 150%, and the water content is further reduced to 8 to 15%. Since it has characteristics that it is difficult to make it, it is difficult to dry the material uniformly, and cracks occur on the surface and inside during drying. Therefore, it is not possible to obtain a column or a base material having excellent appearance and strength. The effect of the present invention is particularly remarkable particularly when cedar wood is used as a raw material.

Next, at least the divided surfaces (the lumber surfaces generated at the time of division) 31 in each of the two divided materials 3 and 3 that have been dried are subjected to uneven processing. That is,
The divided materials 3 and 3 after drying are often warped or distorted, for example, as shown by the imaginary line in FIG. 1 (e). May not be obtained, so that at least the two divided surfaces 31 and 3
1, preferably, all four side surfaces (divided surface 31 and other three side surfaces 32-34) of each divided material 3 are subjected to uneven processing. Here, the uneven processing is processing for removing warpage and distortion generated on the side surface of the divided material. As means for performing the uneven processing, for example, various known devices such as an uneven planarizer and a molder Can be used. In the present embodiment, all four sides of each divided member 3 are subjected to uneven processing using a moulder.

Next, the divided surface 31 subjected to uneven processing
As shown in FIG. 1 (f), a and 31a are bonded to each other via an adhesive (not shown), and the two divided members 3 and 3 are integrated. More specifically, in any one or both of the two divided members 3, 3, the divided surfaces 31 a, 3 subjected to uneven processing are applied.
1a, an adhesive is applied using various known application devices such as a spreader, and the divided surfaces 31a, 31
a are adhered to each other. As the adhesive, various known adhesives can be used, and examples thereof include a urea resin, a vinyl acetate resin, and an aqueous vinyl urethane resin adhesive. Particularly, an aqueous vinyl urethane resin adhesive is preferably used. When using an aqueous vinyl urethane resin adhesive,
In particular, since the adhesive strength is high, sufficient strength is obtained for the pillar or base square material 4, and even after hardening, it is softer than iron, so that the tool or the like may be damaged when the square material 4 is cut or tenoned. Can be prevented. Further, the aqueous vinyl urethane resin adhesive is advantageous in that it does not emit chemicals such as formaldehyde into the atmosphere.

The bonding of the two divided members 3 is performed by bringing the divided surfaces 31a into contact with each other and pressing the upper and lower surfaces of the two divided members 3 and 3 with a press device. It is preferable to bond the upper and lower surfaces of the two divided members 3 and 3 while pressing them evenly.

As the press device, various known devices can be used, but a flat plate press is preferably used. By using a flat plate press, the dividing surfaces 31a, 3
Adhesion can be performed while applying a uniform pressure over the entire area of 1a, and a pillar or a base material having a more excellent appearance can be manufactured. Note that the adhesive is applied to the dividing surface 31.
It is preferable to apply uniformly over the entirety of a.

In the present embodiment, the square member 4 after the division members 3 and 3 are integrated is further subjected to finishing. Here, the finishing process is a process of smoothing at least one of the side surfaces of the square bar 4, and in particular, the divided members 3, 3.
Finishing is performed on a pair of side surfaces whose joints appear on the surface, so that a square material 4 having more excellent design properties can be obtained.
Can be obtained. Finishing is preferably performed on all four sides, and in this embodiment,
All four sides are finished with a moulder.

According to the method of manufacturing a pillar or a timber for a base of the present embodiment, a wood pattern having a natural appearance similar to that of the conventional cored timber 2 as shown in FIG. 2 is thus obtained. ,
In addition, it is possible to economically manufacture the pillar or base square bar 4 excellent in design and strength, in which cracks on the surface and inside are significantly suppressed.

As described above, the present invention has been described based on one embodiment. However, the present invention is not limited to such an embodiment, and can be appropriately changed without departing from the gist of the present invention. For example, a fitting groove is formed along the longitudinal direction of the divided material on each of the divided surfaces of the divided materials after the uneven processing is performed, and each half of the metal material is formed on each of the fitted grooves formed on the divided surfaces. Can be fitted to each other via an adhesive. FIG. 3 is a view showing a pillar or a square bar for a base manufactured in such a manner.
In the square bar shown in FIG. 3A, a metal pipe 5 is disposed on the surface where the divided members 3 and 3 are bonded to each other.
And (c), a plate-shaped metal plate 5a and a metal bar 5b having an H-shaped cross section are arranged in this order on the bonding surfaces of the divided members 3 and 3. In this way, by arranging a non-wooden member, preferably a metal member, on the surface where the divided members 3 and 3 are bonded to each other, it is possible to improve the strength of the entire square member or to strengthen the joint of the square member. be able to. Further, in the above embodiment, the finishing is performed after integrating the divided members 3 and 3, but the finishing can be omitted.

[0021]

The present invention will be further described below with reference to examples. [Example 1] From the log, the cross-sectional dimension was 117 mm x 1 so that the core of the log was located at the center of the cross section of the square bar.
A 20 mm squared bar was sawn, and the squared bar was divided by a plane including the core to obtain a 117 mm × 59 mm divided member. Next, each of the obtained two divided materials was dried and subjected to a humidity control treatment (part of the drying step) to adjust the water content to 10 to 12%.

Next, the four side surfaces of each of the divided materials are subjected to uneven processing using a moulder, and the divided materials (cross-sectional dimensions 110 × 55) after the uneven processing are separated from each other by using an aqueous vinyl. Bonded using a urethane resin adhesive. Lastly, final finishing with a moulder, 105m
Square material for an m-square column was obtained.

The obtained bar has almost the same appearance as the cored bar in the stage of being made from a log, has almost no cracks on the surface and inside, and has sufficient strength as a pillar. It had the following.

[0024]

According to the method of the present invention for manufacturing a pillar or a square for a base, the wood has a natural wood pattern on the surface as well as the conventional cored squares made from logs, and furthermore, the surface and the interior are made. Thus, it is possible to economically produce a column or a base material having excellent designability and strength, in which cracks are significantly suppressed.

That is, since the cored bar is divided and dried on the surface including the core, cracks on the surface and inside of the wood can be suppressed, and a column or base bar having excellent appearance and strength can be obtained. Can be manufactured. In addition, the dried product (divided material after drying) originally obtained from the same cored square bar is glued together so that both cores are aligned with each other to produce a column or base square bar. The appearance of the natural material is almost the same as the original appearance, and a square material excellent in design can be obtained.

In addition, since the cored square bar is divided and dried, the drying efficiency is improved, and the time and cost required for the drying step can be reduced. Manufacturing time and cost can be reduced. In addition, by dividing the cored square bar on the surface including the core and drying it, the material can be easily dried to a low water content, so that a column with a higher strength and a square bar for a base can be manufactured. Is possible.

Further, since the two split materials are integrated by using a pressing device, logs and cored square materials which were unsuitable in the conventional log or drying stage can be used, and the yield in the final finished product can be obtained. Rises. still,
The timber for pillars or foundations according to the present invention is suitable for wooden buildings, especially for houses.

[Brief description of the drawings]

FIG. 1 is a process chart showing each stage of a manufacturing process according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an example of a pillar or a base material obtained by one embodiment of the present invention.

FIG. 3 is a view showing an example of a pillar or a base bar obtained by another embodiment of the present invention, and the lower diagram in each of FIGS. It is a side view, and an upper figure is a XX sectional view of a corresponding lower figure. FIG. 3C is a diagram corresponding to the diagram in the upper part of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Log 2 Core square bar 21 core 22 Surface including core 3 Division | segmentation material 31 Division surface 4 Square material for pillars or foundations

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroyuki Uemura 4-28 Kitahama, Chuo-ku, Osaka City, Osaka Prefecture Inside Sumitomo Forestry Co., Ltd. (72) Inventor Hideyuki Sakai 161-1 Isouracho, Niihama-shi, Ehime No. Sumitomo Forestry Forest Service Co., Ltd. (72) Inventor Keiichiro Kawazoe 4747-1, Hijiya, Ogata, Hyuga-shi, Miyazaki F-term (reference) 2B250 AA01 AA02 BA05 CA01 CA04 DA04 EA01 EA13 FA01 FA21 FA31 FA37 FA53 GA05 HA01 2E163 FA02 FC05 FF41

Claims (3)

[Claims] 1. A core-bearing square lumber made from a log is divided into two divided members by a surface including a core, and both divided members are respectively dried. The square material for pillars or foundations is characterized in that uneven processing is performed, and then the divided surfaces subjected to uneven processing are bonded to each other with an adhesive using a pressing device to integrate both divided materials. Production method. 2. The method according to claim 1, wherein an aqueous vinyl urethane resin adhesive is used as the adhesive. 3. The method according to claim 1, wherein a flat press is used as the press device.