JPS5945102A - Manufacture of square pillar from small-diameter wood - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing square columns for general housing by processing square timbers that have a diameter of 10.5 cm or less and cannot be used as square timbers as they are.

According to the Building Standards Act, the diameter of a square column for general housing is 10.5α.
Since it is stipulated that the area must be north of this point, the use of square columns with diameters smaller than that is prohibited.

Therefore, cedar, cypress, and other coniferous trees that have been thinned out to meet the needs of afforestation, or backwoods or other small-diameter trees that have been made into square pillars with standard dimensions of 1 o, 5 cm or more in diameter, are Since it cannot be manufactured, it has low utility value.

In view of the recent shortage and high cost of wood resources, the present invention focuses on the use of thinned wood, backwoods, and other small-diameter trees that have low utility value but are cheap, and utilize four sides of square timbers of these small-diameter trees. By pasting together sawn boards using adhesive, it is possible to manufacture rectangular pillars with standard dimensions of 1015 or more at a low cost.The Shizuoka Industrial Research Center was asked to prototype and test this, and as a result of research, the following results were obtained: The following points have become clear.

(1) Changes in moisture content of wood over time and distortion of wood The moisture content of wood is an important factor in determining the quality of the product, and generally, when adhesive processing is performed, 15% is the northern limit.

Fresh wood has a moisture content of 150 to 200% immediately after being felled, and it is necessary to reduce this moisture content efficiently and while minimizing cracking, warping, and deformation of the wood.

(b) If the wood is immediately sawn into 8.5cm square pieces after felling and left indoors with good ventilation, the yield will decrease to about 85% in about a month.

(b) Immediately after felling, if the timber is sawn into 8.5 cm square pieces with a back split and left in a well-ventilated room, the yield will decrease to about 30% in about a month.

(c) If raw wood is turned into sawn boards with a thickness of 1.5α and left in a well-ventilated room, the yield will decrease to about 18% in about 2 to 8 weeks.

Therefore, the remaining issue regarding wood drying is how to glue wood whose moisture content has been reduced to around 15% through natural drying without causing defects such as cracking, warping, and twisting. In order to reduce the temperature to around 10%, this can be done by using a solar system or by applying dehumidification and drying.

(2) Wood cutting method and product accuracy and mechanical strength (a) As an example of implementation, both ends 2.2 with a thickness of 1.5 cm are cut on the four sides of a coniferous timber 1 with a diameter of 7.5 mm to serve as the core. 45 cypress or cedar sawn boards 8 that have been processed to be able to be joined together using an adhesive are used to produce a square pillar with a diameter of 10.5 (!fi) using the four-sided tight joining method as shown in FIG.

The present invention is mainly based on this four-sided tight welding method, but this method requires high processing precision, and slight deviations can cause peeling of the welded parts.

(b) For this reason, if the three-way stanchion method shown in FIG. 2 is used, there are two stanchion joints, which increases the tolerance for machining accuracy to a certain extent.

However, in this method, two adhesive layers 4.4 are exposed on one side of the product, which unavoidably lowers the product value compared to a product that is tightly bonded on all sides.

(C) Therefore, as shown in Figure 3, a method using a four-sided close-tight method and obtaining a certain degree of tolerance is as follows.
It was decided to provide a play groove 5 in one place among the four sides.

With this method, one place in the welded part becomes a groove, so some deviations can be covered.

Incidentally, the play groove 5 is finally filled with a filler 6, and the thickness of the filler 6 is used to cut the edges 7 of the prisms.

In any of the above cases, if necessary to prevent cracking, warping, or misalignment of the square material 1 that will become the core, as shown in Figure 5,
Provide 8 back splits.

(3) Adhesive processing method and adhesive durability As an adhesive, water-based vinyl urethane is superior in terms of durability and the inconspicuous color of the adhesive layer.

In addition, if a higher degree of durability is required, use water-based vinyl urethane for the tacking part, and use the core square material 1 and the surface sawn board 4.
Resorcinol adhesive is suitable for the adhesive part.

The present invention is constructed as follows, and has the following excellent effects.

(b) Both the core square timber 1 and the sawn board 3 are salvaged timbers with low utility value;
Since small-diameter trees such as Uragi and other coniferous trees are used, the prisms can be manufactured at low cost and of high quality, and wood resources can be used effectively.

(b) Since a square column manufactured from small-diameter wood is used as the core square material 1, the strength performance is more stable compared to a conventional laminated column made of thin sawn boards laminated and bonded.

(c) Since the sawn board 3 on the surface is processed so that it can be joined at an angle of 45 degrees, the adhesive layer of the completed prism is not noticeable.

2) Since the sawn board 3 with a thickness of about 1.5α is used as the surface material, it is easy to plan the surface during construction.

On the other hand, in conventional laminated columns, the thickness of the surface material is 1.2~
It is difficult to plane because the tltfi is about 1.5 tltfi.

(e) Since both the core square timber 1 and the surface sawn board 4 are made of Japanese cedar, cypress, or other domestically produced coniferous trees, it provides a sense of security compared to general laminated columns made of foreign materials such as hemlock.

As described above, the present invention utilizes small-diameter wood, which had conventionally had low utility value, as a prism, and it can be manufactured at a low cost, so it has extremely excellent effects in light of the current lack of wood resources and high prices. be.

[Brief explanation of drawings]

Figure 1 is a plan view of a square column with a four-way joint method, Figure 2 is a plan view of a sawn board, Figure 3 is a plan view of a square column with a three-way joint method, and Figure 4 is a plan view of a square column with a four-way joint method. FIG. 5 is a plan view of a rectangular column provided with an idle groove at one location, and FIG. 5 is a plan view of a rectangular column provided with a back split. 1... Core square material, 2.2... Both ends of sawn board,
8... Grinding board, 4.4... Adhesive layer, 6...
... Playing groove, 6... Filling wood, 7... Edge cutting, 8... Back splitting. Patent Applicant: Fuyoshi Obama, Seihito Sugimori -7- i ノ ■ ん 4 σ lt-; wo 9 - Mine 3 Enkenbo m Mine da 3 7 Amendments to the Contents and Procedures December 1982 λ Japan Patent Office Reception Office Kazuo Wakasugi Indication of Case 1 Patent Application 1983-1555992 Name of Invention Method of Manufacturing a Prismatic Column from Small Diameter Wood 8 Relationship with the Amendment Case Patent Applicant 4 Agent Address Shizuoka 16-17 Hitachi-cho, Shimizu City, Prefecture Name (589)
1) Sei Sugimori - Date of 5th amendment order Subject of spontaneous 6th amendment Description and drawings 1- (1) "Figure 2" in the third line from the bottom of page 4 of the specification is amended to read "Figure 3." (2) "Figure 8" on page 5, line 4 of the specification is corrected to "Figure 4." (3) Correct "grinding board 4" in the first line and second line from the bottom of page 6 of the specification to "grinding board 3." (4) In the first line from the bottom of the same sentence, ``because it is used,'' is corrected to ``if it is used,''. (5) Add "Number 4" to Figure 3. Granny 3 Mouth

Claims (3)

[Claims] (1) The four sides of a coniferous timber with a diameter of 10.5α or less that will serve as the core are made with sawn cypress or cedar boards that have been processed so that both ends can be joined at 45 degrees with adhesive, making the diameter 10.5α or more on all sides. A method for manufacturing prisms from small-diameter wood, characterized by a close-tie method. (2) Three sides of a coniferous wood corner with a diameter of 10.5 cm or less that will serve as the core, and sawn boards of cypress and cedar that have been processed so that both ends can be fastened to 45 inches are attached with adhesive to make a diameter of 10.5 d or more. A method for manufacturing a prism from small-diameter wood according to claim 1, characterized by a distillation method. (3) Hinoki or cedar sawn boards that have been processed so that both ends can be fastened at 45 degrees are bonded to the four sides of a coniferous wood corner with a diameter of 10.5 cm or less, which will serve as the core, with adhesive, creating a four-sided close-tight method. From the small-diameter wood according to claim 1, characterized in that an idle groove is provided at one place among the four-sided tight joints, a filler is placed in the groove, and the edge of the square pillar is cut using the thickness of the filler. How to make a prism.