JPH04247902A - Panel made lumber obtained from thinning - Google Patents

Abstract

PURPOSE:To use effectively lumber produced by thinning as building material. CONSTITUTION:Lumber from thinning is divided into two and the surface sides of sawn lumber are joined to each other by tuning the inner side of the sawn lumber outside. End faces of block materials 10 formed into a blocklike state and adjoining to each other by cutting the same into fixed lengths are stuck to each other by fitting unevenness of the end faces in each other in a lateral direction and the block materials 10 are stuck close to each other by fitting a connecting material into fitting grooves provided in the top and bottom of the block materials 10 in a vertical direction. With this construction, the block materials are stuck to each other by piling up each other, recessed grooves are formed laterally in the front and rear of the foregoing block materials, a wooden dowel 22 is fitted into the recessed grooves and fixed, through which the same is formed into an integrated boardlike state. Repelling force of the block materials each are acted upon geometrically and a board integrated firmly is obtained.

Description

Description: [0001] The present invention relates to a thinned wood panel formed using thinned wood. [Background Art and Problems to be Solved] Currently, Japan's dependence on imported wood for the total amount of wood consumed is approximately 70%.
% is exceeded. The share of domestic timber is in a situation that can be called a crisis for Japan's forestry industry. This dependence on imported wood began around 1963, and this is because imported wood is thick and has few knots, so it has a wide range of uses regardless of the quality of the material, and it is cheap. As a result,
Domestic timber has been under pressure from imported timber, and the domestic timber used for building materials has come to be limited to the best materials such as cypress and cedar. Maintenance of mountain forests requires maintenance such as thinning. usually,
The maximum age for thinning is about 35 years, and the young trees that can be used are around 15 years old. In the past, thinned wood was used for scaffolding, ladders, roof bases, rice racks, etc. at construction sites, but these days there are almost no such uses, and there is no use of thinned wood at all. Until around 1955, afforestation was relatively active, and the trees planted with cypress, cedar, pine, and Japanese pine are now 35 to 50 years old. However, due to economic reasons such as rising labor costs and lack of use for thinned wood, forest maintenance has become extremely inadequate, and as a result, forests have become desolate and in a dire state. In this way, due to lack of sufficient maintenance such as thinning, the trees do not grow taller, some wither and wither, and only bad wood with thick branches grows, leaving only standing trees with conspicuous ``Ate''. There is. In this way, Japan's timber market is dominated by foreign timber. On the other hand, due to rising labor costs in Japan's forests, it is said that if forest thinning is not carried out and the current situation continues, Japan's forestry industry will be in a state of collapse. [0003] On the other hand, imported materials are made into long materials due to transportation requirements and foreign construction methods. This will be cut to fit the Japanese architectural style. In such cases, there are problems, such as the formation of a large amount of "sawdust" when sawing the base materials for the walls. Furthermore, imported wood often has older trees, which are weaker and cannot be reused once used, resulting in a shortened useful life. Compared to this, domestically produced wood has the advantage of being much stronger and more durable. In view of the above-mentioned problems, the present invention makes it possible to use thinned wood, which has not been considered in the past, as a high value-added product, thereby promoting the use of thinned wood and, in turn, protecting and nurturing mountain forests. The purpose is to provide a thinned wood panel that makes it possible to effectively achieve this goal. Means for Solving the Problems The present invention has the following configuration to achieve the above object. In other words, the thinned wood is divided into two pieces, the back side of the wood is placed outside and the front side of the wood is joined together, and the block material is cut into a predetermined length and formed into a block shape.
In the horizontal direction, the end surfaces of adjacent block materials are fitted with concave and convex grooves and bonded together, and in the vertical direction, connecting materials are inserted and fixed into the fitting grooves provided on the top and bottom surfaces of the block materials, thereby stacking and bonding. It is characterized in that grooves are formed in the horizontal direction on the front and back surfaces of the block material, and fillers are inserted and fixed into the grooves to form an integral board shape. Further, when the blocks are fitted and bonded to each other in the horizontal and vertical directions, the blocks are arranged and bonded so that the repulsion directions of the blocks are alternately oriented in different directions. . [Operation] By joining the two front sides of the wood with the back side of the thinned wood on the outside, warping occurs due to the difference in the shrinkage rate of the thick white part and the shrinkage rate of the red part, and this warping occurs. By using the shrinkage energy of the block materials to fit the blocks into concave and convex shapes, and then adhesively connect them via the connecting material, the mutual repulsive forces act synergistically, resulting in an extremely strong integrated panel. . DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is an explanatory diagram showing one embodiment of a thinned wood panel according to the present invention. As shown in FIG. 1, the thinned wood panel according to the present invention is made by combining block materials 10 formed into blocks using thinned wood in the horizontal and vertical directions and integrally joining them into a board shape. Thinned wood is young, has many white parts, and has a high shrinkage rate, so when combining blocks to form a board, these thinned wood are used to take advantage of their characteristics. FIGS. 2 and 3 show block materials constituting the thinned wood panel shown in FIG. 1. Block materials are joined by combining pieces that are joined in the horizontal and vertical directions using uneven fitting, but the block material 10 is made by cutting thinned wood in half and joining the front side of the wood with the back side of the wood on the outside. Form. Figure 4 shows how the thinned wood is divided into two and the square lumber is removed. The two pieces of material are then joined together on the front side so that the back side (the core side of the wood) faces outward from each other. Figure 5 shows a state in which, after the square pieces have been joined back to back as described above, a fitting groove 12 for vertically connecting the block pieces and a groove 14 for communicating laterally on the front and back sides of the block pieces are provided. It is. After the fitting groove 2 and groove 14 are provided in communication with each other as described above, the block material 10 is formed by cutting to a predetermined length as shown in FIGS. 2 and 3. As described above, the block members 10 are connected by fitting concave and convex in the lateral direction. In FIG. 3, 16 is a fitting protrusion that projects toward the adjacent block material 10, and in FIG. 2, 18 is a fitting recess into which this fitting protrusion 16 is fitted. By fitting the fitting protrusion 16 into the fitting recess 18 and joining the block material 10, the fitting groove 12 and the groove 14 communicate with each other. [0009] When forming a thinned wood panel, proceed as follows. First, the block members 10 are fitted horizontally into concave and convex portions and are joined and connected using an adhesive. This block material 10
When connecting horizontally, block materials with the straight grain on the front side and block materials with the end side on the front side are arranged alternately. Then, the block members 10 are connected and the concave groove 14 is
After communicating with each other, a filler 20 is inserted into the communicated groove 14 and fixed with adhesive. The filling wood 20 is an elongated material that matches the cross-sectional shape of the groove 14, and by connecting the blocks 10 continuously, the strength of the board can be improved. As shown in FIG. 4, the filling wood 20 can be taken from the remaining lumber when the square lumber is cut from the log, and the log can be used effectively. When the blocks 10 are connected in the horizontal direction as described above, the fitting grooves 12 on the upper surface of the blocks 10 are communicated with each other. The block materials 10 are joined. As shown in FIG. 1, the connecting member 22 is fitted into a gap created in the fitting groove 12 portion of the upper and lower block members 10 when the upper and lower blocks 10 are overlapped. In this way, by connecting the blocks 10 laterally and in the vertical direction, a thinned wood panel that is integrally formed by the concave-convex fitting between the connecting members 22, the fillers 20, and the blocks 10 can be obtained. This thinned wood panel is made up of block materials 10 that are combined vertically and horizontally to form an integrated board, and is characterized by being an extremely strong board. In addition, when the block materials 10 are stacked in the vertical direction, it is preferable to join the upper and lower blocks so that their joints are not at the same position. In Figure 6, it can be seen that the blocks 10 are arranged so that the straight grain and the end of the wood are alternate, and the seams are not in the same position on the top and bottom, so that the blocks 10 in the horizontal direction are fitted in a concave and convex manner. This is a simple illustration. [0011] The reason why the square timbers cut in half as described above are joined with the back side of the timber facing the front side is to effectively utilize the characteristics of the thinned timber itself to obtain a panel with high strength. Figure 7 is a diagram showing the characteristics of thinned wood, which is a log of thinned wood that has been sawn from the outer wall to the center and dried. Thinned wood consists of a reddish part A at the core and a thick white part B outside the reddish part, but trees that are less than 30 years old are characterized by having a lot of white parts, and the white part B is reddish. It has more moisture than part A, and therefore shrinks at a higher rate upon drying, and as a result, the outer periphery is stretched in the direction shown in FIG. 7. The moisture content of raw wood is 60% ~
It is said to be 100%, and 12% to 19% for air-dried materials. When the present inventor actually divided the reddish part and the thick white part and measured their weight in the green state and in the dried state, the following results were obtained. When the standing wood was made into lumber and divided into a reddish part and a white part, the reddish part weighed 100g and the white part weighed 225g in the raw state. This was artificially dried, and when the weight after drying was measured, the reddish part weighed 90 g and the white part weighed 120 g. Therefore, it can be seen that this sample contained 64.6% moisture as a whole. It was also confirmed that the reddish part had very little water content, and most of the water was contained in the white thick part, and that the shrinkage rate of the white thick part was high when drying. FIG. 8 shows the state in which the square timbers are joined with the back side of the wood (core side) outside, but as mentioned above, as the shrinkage rates of the reddish part A and the thick white part B are different, the joined square timber is made of wood. The back side will bulge out and the white thick side will start to contract. The block material is provided with fitting grooves 12 on the upper and lower surfaces where the square pieces are joined, and by providing the fitting grooves 12 in this way, the shrinkage energy of the block material can be effectively utilized. Figure 9
1 shows a state in which a fitting groove 12 and a concave groove 14 are provided, and the fitting groove 12 acts to be compressed in the direction of the arrow in the figure due to the characteristics of the block material. This effect makes it possible to connect blocks extremely firmly in the vertical direction using the connecting member 22. In addition, when the fitting groove 12 is formed and the connecting member 22 is inserted into the fitting groove 12 for connection,
Compared to the case where blocks having rectangular cross sections are simply stacked and bonded together, the bonding area increases and the bonding force increases. Further, the groove 14 is provided for the purpose of alleviating twisting, twisting, and deformation of the block material caused by joining the wood with the back side outside. That is, by removing the portion near the core with the groove 14, the wood grain of the core portion is cut midway, thereby eliminating core cracking and distortion of the block material itself. As shown in Figure 8, when taking square timbers from logs, depending on the diameter of the timber, the outer wall of the log may remain on the outside of the timber, but this part can be removed inside by joining the square timbers back to back. This is a hidden portion, and since it is removed by forming the fitting groove 12, there is no problem with appearance or the like. In this way, the thinned wood panel of this embodiment takes advantage of the difference in the shrinkage rate of the thick white part and the reddish part of the thinned wood, that is, the difference in the characteristics of the wood itself, and can be used in various directions vertically and horizontally. By combining them, it is possible to obtain extremely high strength due to the synergistic effect. Therefore, a material with strong resilience can be effectively used as the wood used for the panel. For example, the wood shown in Figure 10 is a typical Ate wood that was grown on a steep slope and tries to grow straight, with the center of the tree leaning toward the mountain side. Although such wood cannot generally be used, It can be effectively used as a block material for panels. Furthermore, the wood shown in FIG. 11 is a wood that grew on a landslide site and has different density of annual rings in the core and outer parts, but even such wood can be used effectively. As described above, thinned wood panels are constructed by synergistically utilizing the characteristics of the wood itself, such as warping or twisting, so it is an extremely effective way to utilize wood such as thinned wood. In addition, when connecting the block materials, they are integrally joined using an adhesive. When joining blocks as described above, gaps may occur at the joint due to warpage of the blocks, etc., but as shown in Figure 12, fill the gap C with adhesive. This allows for stronger integration. [0014] In manufacturing the thinned wood panel, wood is used as a block material as described above, and the size of the block material may be set to an appropriate size. Usually 30m
A block material of about m square to 50 mm square is used, but the length is 100 m.
A size of approximately m square is also possible. In actual manufacturing work, it is sufficient to uniformly form several standardized block materials, making mass production easy. Moreover, the size of the panel can be formed to an appropriate size by changing the number of block materials, and it can be manufactured into a product depending on whether it is used as a floor material, wall material, etc. In the example of FIG. 1, a connecting member 22 is provided so as to partially protrude from the end face of the board for use on a wall surface. Figure 13 shows this board as a pillar material 24.
This shows how it is attached to. A groove 26 into which the protrusion of the connecting member 22 is inserted is previously provided in the column 24, and the protruding portion of the connecting member 22 is fitted into the groove 26 and can be fixedly attached to the column 24. The pillar material 24 and the board may be fixed by, for example, bolting at a predetermined height from the floor. By using thinned wood panels in this way, it is possible to shorten the construction period for houses and the like. Thinning panels have extremely high strength, so they can also act as reinforcing materials by attaching them to designated locations. For example, by using it on a wall, the wall itself functions as a reinforcing material, resulting in an extremely robust structure. In addition, since it is sufficiently thick, it can exhibit effective heat insulation and soundproofing properties. In addition, by using a mixture of various materials, the robustness is improved, and the various materials appear on the surface like a mosaic, making the design interesting and giving the warmth of wood. Of course, it can be provided as an interior material or the like by pasting a good quality material on its surface, or it can be provided by caulking, spraying, or various painting treatments on the surface. Thinning panels can be used as various building materials, including flooring materials, wall materials, roofing materials, partitions, furniture, and general construction materials. It can also be used as an exterior material by finishing with resin coating or mortar. As described above, thinned wood panels are made strong by effectively utilizing effects such as warping of block materials, so it is effective to use materials with various different characteristics. Therefore, the wood used is not limited to cedar, cypress, red pine, black pine, karamatsu, etc., softwood,
All types of wood, including deciduous trees, can be used, and wood from thinnings can be used extremely effectively. Thinned wood has no use and is left in large quantities without much consideration, so it has the advantage of being extremely low in material cost. On the other hand, products made from thinned wood panels are functionally superior products as described above, have high commercial value, and are extremely effective as an effective use of thinned wood. As mentioned above, since the thinned wood panel according to the present invention is formed by combining block materials as a unit, the material of the block material is not limited to thinned wood, and of course, various materials can be used. In this way, according to the thinned wood panel of this embodiment, it is possible to effectively utilize thinned wood, and it is possible to open up a way to use thinned wood and miscellaneous trees that are left unattended in mountain forests. By using thinned wood, etc., it becomes possible to maintain the forest, and in turn, the healthy growth of the forest can be achieved. Particularly in depopulated areas that often have a lot of mountain forests, it is possible to achieve effective commercialization, and it is possible to promote the forestry industry as well as protect the forests. The present invention has been variously explained above with reference to preferred embodiments, but it goes without saying that the present invention is not limited to these embodiments and can be modified in many ways without departing from the spirit of the invention. Nor. [0016] According to the thinned wood panel of the present invention, as described above, by assembling the block materials forming the panel by combining the warpage of the wood, etc., the characteristics of the wood work synergistically. can be used to form extremely rigid panels. In addition, the obtained thinned wood panels can be used as flooring materials, wall materials, and other building materials with excellent strength, heat insulation, and soundproofing functions. In addition, it is possible to make effective use of thinned wood that has been left in mountain forests because there is no effective way to use it, and it can be provided at a low cost. It has a significant effect, such as being able to contribute.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a thinned wood panel.

FIG. 2 is a perspective view showing a block material.

FIG. 3 is a perspective view showing a block material.

FIG. 4 is an explanatory diagram of a state in which square timber is removed from thinned timber.

FIG. 5 is a perspective view of a state in which square pieces are joined to form a fitting groove and a groove.

FIG. 6 is an explanatory diagram showing the assembly of block materials.

FIG. 7 is an explanatory diagram showing shrinkage force acting on thinned wood.

FIG. 8 is an explanatory diagram of a state in which the wood is joined with the back of the wood facing outward.

FIG. 9 is an explanatory diagram of a state in which a fitting groove and a groove are formed.

FIG. 10 is an explanatory diagram showing an example of an attachment material.

FIG. 11 is an explanatory diagram showing an example of an attachment material.

FIG. 12 is an explanatory diagram showing bonding using an adhesive.

FIG. 13 is an explanatory diagram showing a method of attaching the panel to the pillar material.

[Explanation of symbols]

10 Block material 12 Fitting groove 14 Concave groove 16 Fitting protrusion 18 Fitting recess 20 Buried wood 22 Connecting material 24 Pillar material

Claims (2)

[Claims] Claim 1: Thinned wood is divided into two pieces, the back side of the wood is placed outside, and the front side of the wood is joined together, and the block material is cut into a predetermined length and formed into a block shape, and the end face of the adjacent block material is cut in the horizontal direction. are bonded by fitting them into concave and convex surfaces, and in the vertical direction, connecting materials are inserted and fixed into the fitting grooves provided on the top and bottom surfaces of the block materials to stack and bond them, and the front and back surfaces of the block materials are bonded horizontally. 1. A thinning material panel characterized in that it is formed into an integral board shape by forming a groove in the groove and inserting and fixing filler wood into the groove. 2. When the blocks are fitted and bonded together in the horizontal and vertical directions, the blocks are arranged and bonded so that the repulsion directions of the blocks are alternately oriented in different directions. The thinned wood panel according to claim 1.