Heartwood and heartwood structures

Abstract

To provide a core material and a core material structure which can be easily combined and fixed together in a log-like shape and can be stably formed into a plate or wall shape. The core material is used as a core material structure, and is cylindrical. core The side of the core material has a recess formed in the longitudinal direction, a back split groove is provided on the side at a position more than 90 degrees away from the recess with respect to the center of the cylinder, convex portion forming grooves are provided on both sides of the back split groove parallel to the back split groove, and convex portions are formed by the two convex portion forming grooves, and the recess and convex portions of the core material can be joined together.

Description

[Technical Field]

[0001] The present invention relates to core materials, and more particularly to a technique for joining core materials together to form a core material structure. [Background technology]

[0002] Conventionally, heartwood such as thinned wood has been used as log stakes, for example, as splints for trees in public facilities (buildings, parks, etc.). However, since its uses are limited, other uses were being sought. Therefore, there was a need for a structure that could combine multiple thinning materials and be stably formed into boards or walls.

[0003] Various technologies have been proposed to address these problems. For example, processed columns (see Patent Document 1) have been proposed and are known as such. More specifically, this is a technical proposal that involves splitting the back of a laminated column, creating a dovetail groove, and fixing a reinforcing material with adhesive, thereby integrating the laminated timber and the reinforcing material, making the column less susceptible to deformation. However, because the structure involves creating a dovetail groove in the split part of the back and using adhesive to prevent deformation of the laminated wood, it is not a method that can stably secure multiple pieces of wood together. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 53-144214 Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the above problems, the present invention aims to provide a core material and a core material structure that can be easily combined and stably molded into a plate or wall shape. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention provides a core material used as a core material structure, the core material having a cylindrical shape. core The side of the support has a recess formed in the longitudinal direction, a back split groove is provided on the side at a position 90 degrees or more away from the recess with respect to the center of the cylinder, convex portion forming grooves are provided on both sides of the back split groove parallel to the back split groove, and a convex portion is generated by the two convex portion forming grooves, core The recesses and protrusions of the support members are joined by a means that allows them to be joined together.

[0007] In addition, the present invention employs a method in which, when core materials are joined together using a convex portion and a concave portion, the side of the convex portion abuts against the inner surface of the concave portion, or, after joining, the core materials dry, causing the spine groove to open and the side of the convex portion abuts against the inner surface of the concave portion.

[0008] Furthermore, the present invention employs a means in which, in the width direction of the core material, the convex portion has an extended portion at the end side that is longer than the base portion, and the concave portion has an expanded portion at the back that is longer than the entrance portion.

[0009] Furthermore, the present invention employs a method in which, when joining core materials together, the entrance section is longer in the width direction than the expansion section, and after joining, as the core materials dry, the back split groove opens, making the length of the expansion section longer than the length of the entrance section.

[0010] Furthermore, the present invention employs a means in which the recessed portion has a dovetail groove shape, and the protruding portion has a dovetail shape corresponding to the dovetail groove shape.

[0011] Furthermore, the present invention employs a means in which the recessed portion has a T-shaped groove shape, and the protruding portion has a T-shape corresponding to the shape of the T-shaped groove.

[0012] Furthermore, the present invention employs a means in which the convex portion forming groove is composed of the convex portion side surface, bottom surface, and outer surface, and the edge of the outer surface abuts against the side surface of the corresponding core material when the core materials are joined together.

[0013] Furthermore, the present invention employs a means in which the convex portion forming groove is composed of the convex portion side surface and an outer surface, and at least a portion of the outer surface abuts against the side surface of the corresponding core material when the core materials are joined together.

[0014] Furthermore, the present invention employs a means in which the heartwood is thinned wood.

[0015] Furthermore, the present invention employs a core structure in which the core materials are joined together.

[0016] Furthermore, in the core structure of the present invention, when the core members are joined together, an adhesive is applied to the joined portion.

[0017] Furthermore, in the core material structure of the present invention, after the core materials have been joined together, a regulating body that regulates the closure of the back split groove is inserted into the back split groove from the end of the core material. [Effects of the Invention]

[0018] According to the present invention, core materials can be easily combined and stably formed into a plate or wall shape. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is an overall perspective view showing an embodiment of a core material according to the present invention. [Figure 2] 1 is an explanatory diagram showing a joining procedure for core-bearing materials according to the present invention. [Figure 3] 1 is an explanatory diagram showing a joining procedure for core-bearing materials according to the present invention. [Figure 4] 10 is an explanatory diagram showing another joining structure in a core material according to the present invention. FIG. [Figure 5] 1 is an explanatory diagram showing an example of use of a core material structure according to the present invention. FIG. [Figure 6] 1 is an explanatory diagram showing an example of reinforcement of a core material structure according to the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0020] The greatest feature of the core material according to the present invention is that core materials can be easily and firmly joined together and can be stably formed into a plate or wall shape. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a core material and a core material structure according to the present invention will be described with reference to the drawings. Furthermore, the core material and core material structure of the present invention are not limited to the examples described below, but can be modified as appropriate within the scope of the technical concept of the present invention, i.e., within the scope of shapes, dimensions, structures, etc. that can achieve the same functional effects.

[0021] The present invention will be described with reference to FIGS. FIG. 1 shows a core material structure according to the present invention, where (a) is an overall perspective view and (b) shows the joint structure of the core material. FIG. 2 shows the joining procedure for the first joining structure, where (a) shows the state before joining, (b) shows the state immediately after joining, and (c) shows the state after joining with the back split open. Figure 3 shows the joining procedure for the second joining structure, where (a) is before joining, (b) is immediately after joining, (c) is the state after joining with the back split open, and (d) and (e) are examples where the width of the end of the convex portion is smaller than the entrance of the concave portion, with (d) showing the case of the first joining structure and (e) showing the case of the second joining structure. Figure 4 shows modified joining structures, where (a) shows the first joining structure, (b) shows the T-groove joining structure, (c) shows the bulging joining structure, and (d) shows a structure in which the positions of the convex and concave portions are changed. Figure 5 shows examples of the use of core timber structures: (a) is an example of a house wall, (b) is an example of a house (log cabin), and (c) is an example of a desk. Figure 6 shows examples of strengthening the core material structure of the present invention, where (a) is the joined state, (b) is the dried state with the back groove open, (c) is an example of preventing the back groove from closing using a wedge material, (d) is an example of preventing the back groove from closing using a filling adhesive, and (e) shows an overview of inserting a wedge material into the back groove.

[0022] The heartwood 1 is mainly made from thinned wood. By using thinned wood, it is possible to reduce the amount of thinned wood that is disposed of and discarded. The side surface 11 has recesses 30 and protrusions 50, and by joining the recesses 30 and protrusions 50 and combining the core material 1 in a raft shape, it can be used as a board, wall, etc. (Fig. 1(a)). The recess 30 has a dovetail groove 35 shape, and the protrusion 50 has a dovetail shape 55 shape. The heartwood 1 has a back split groove 40, which is a processing applied to the material including the central part of the heartwood 1, in order to prevent cracking due to drying of the wood. The convex portion 50 has a shape that includes a part of the back split groove 40. When the core material 1 is viewed from the end face 10, the back split groove 40 passes through approximately the center of the convex portion 50. The protrusion 50 has a dovetail shape 55, and has an extended portion 53 that is longer than the base portion 51 on the end portion 52 side in the width direction of the core material 1. The protrusion side surface 54 forms the side surface of the dovetail shape 55. In order to provide the protrusions 50 on the core material 1, it is necessary to cut both side surfaces of the portion that will become the protrusions 50. The protrusions 50 are formed by providing two protrusion-forming grooves 60 in the longitudinal direction of the core material 1. The convex portion forming groove 60 is made up of a bottom 61, an outer surface 62, and a convex portion side surface 54. The bottom 61 is a portion that adds height to the convex portion 50. The convex portion side surface 54 is the side surface of the convex portion 50, and therefore has a shape and angle that forms the side surface of the convex portion 50 if the convex portion 50 is dovetail-shaped 55. The outer surface 62 is not directly related to the formation of the convex portion 50, but by properly providing the outer surface 62, when core materials 1 are joined together, the side of the opposing core material 1 and the edge of the outer surface 62 abut, making the joint more stable. The recess 30 is a dovetail groove 35, and therefore has a widened portion 33 that is longer than the inlet portion 31 on the innermost portion 32 side in the width direction of the core material 1. In Figure 1, the recess 30 and the protrusion 50 are located in opposing positions, but there is no limit to the angle as long as the recess 30 and the protrusion 50 are separated by more than 90 degrees relative to the center of the core material 1 when it is made into a cylinder. When the protrusion 50 and the recess 30 are joined together, there may be a small gap between the side surfaces of the protrusion 50 and the recess 30. This is because, after joining, the spine slit 40 opens and the gap is deformed to disappear.

[0023] The joint structure shown in FIG. 1(b) and FIG. 2 will be described as a first joint structure 20. The two core materials 1 are arranged so that the convex portions 50 and the concave portions 30 face each other (FIG. 2(a)). The protrusion 50 is joined to the recess 30. In the example of Fig. 2, the extension 53 of the protrusion 50 is larger than the entrance 31 of the recess 30, so the protrusion 50 cannot be inserted into the recess 30 directly. Therefore, the protrusions 50 are inserted from the end face 10 of the core material 1 along the recesses 30 while being shifted, and the recesses 30 and the protrusions 50 are joined together (FIG. 2(b)). By adjusting the shapes of the recess 30 and the protrusion 50, the edge of the entrance portion 31 of the recess 30 abuts against the base portion 51 of the protrusion 50, and the edge of the outer surface 62 on the protrusion 50 side abuts against the side surface 11 on the recess 30 side, and the two core-supporting materials 1 are firmly joined. Furthermore, by applying adhesive 70 to the side surfaces of the recessed portion 30 and the protruding portion 50, the recessed portion 30 and the protruding portion 50 can be made stronger.

[0024] The core material 1 deforms as it dries. At this time, due to the presence of the split grooves 40, the core material 1 deforms in the direction in which the split grooves 40 open. After the core pieces 1 are joined together, as the core pieces 1 dry, the spine grooves 40 open, and accordingly the expanded portions 53 of the protrusions 50 also open. In other words, after joining, the spine groove opens as the core material dries, and the side surface of the convex portion comes into contact with the inner peripheral surface of the concave portion. As a result, the protrusions 50 deform in a direction that bonds more strongly with respect to the recesses 30, so that the bond between the core materials 1 can remain strong even after construction is complete (FIG. 2(c)).

[0025] The joint structure of FIG. 3 will be described as a second joint structure 21. The structure of the convex portion forming groove 60 is different from that of the first joining structure 20. In the first joining structure 20, the convex portion forming groove 60 is composed of a bottom 61, an outer surface 62, and a convex portion side surface 54, but in the second joining structure 21, the convex portion forming groove 60 is composed of the outer surface 62 and the convex portion side surface 54. The outer surface 62 is not directly related to the formation of the convex portion 50, but by properly providing the outer surface 62, when core materials 1 are joined together, the side surface of the opposing core material 1 abuts against the wide surface of the outer surface 62, making the joint more stable. The two core materials 1 are arranged so that the convex portions 50 and the concave portions 30 face each other (FIG. 3(a)). The protrusion 50 is joined to the recess 30. In the example of Fig. 3, the expansion portion 53 of the protrusion 50 is larger than the entrance portion 31 of the recess 30, so the protrusion 50 cannot be inserted directly into the recess 30. Therefore, the protrusions 50 are inserted from the end face 10 side of the core material 1 along the recesses 30 while shifting the protrusions 50, and the recesses 30 and the protrusions 50 are joined together (FIG. 3(b)). By adjusting the shapes of the recess 30 and the protrusion 50, the edge of the entrance 31 of the recess 30 abuts against the base 51 of the protrusion 50, and the wide surface of the outer surface 62 on the protrusion 50 side abuts against the side surface 11 on the recess 30 side, and the two core-supporting materials 1 are firmly joined. Furthermore, by applying adhesive 70 to the side surfaces of the recessed portion 30 and the protruding portion 50, the recessed portion 30 and the protruding portion 50 can be made stronger.

[0026] The core material 1 deforms as it dries. At this time, due to the presence of the split grooves 40, the core material 1 deforms in the direction in which the split grooves 40 open. After the core pieces 1 are joined together, as the core pieces 1 dry, the spine grooves 40 open, and accordingly the expanded portions 53 of the protrusions 50 also open. As a result, the protrusions 50 deform in a direction that bonds more strongly with respect to the recesses 30, so that the bond between the core materials 1 can remain strong even after construction is complete (FIG. 3(c)). By matching the shape of the outer surface 62 to the shape of the side surface 11, the bonding area during deformation can be increased, and the bonding strength can be made stronger.

[0027] It is also possible to make the length of the expanded portion 53 of the convex portion 50 shorter than the inlet portion 31 of the concave portion 30 in the width direction of the core material 1 (FIGS. 3(d) and 3(e)). By using such a shape, the protrusion 50 can be directly inserted into the recess 30, which simplifies the joining process. After construction, as the core material 1 dries, the back split groove 40 opens, the expansion part 53 widens, and the size of the expansion part 53 becomes larger than the inlet part 31, so it does not easily come out. Therefore, despite being easy to install, the strength of the core material structure 2 after construction can be increased compared to other structures.

[0028] Modified examples of the shapes of the recessed portion 30 and the protruding portion 50 will be described with reference to FIG. Fig. 4(a) shows the first joining structure 20 described above. In contrast, Fig. 4(b) shows the convex portion 50 as a T-shape 56 and the concave portion 30 as a T-groove 36. The shapes of the T-shape 56 and the T-groove 36 greatly restrict the direction in which the two core materials 1 separate, reducing the possibility of separation after joining. 4(c) shows that the convex portion 50 is a bulging portion 57 that bulges out in a curved manner, and the concave portion 30 has a shape that corresponds to the bulging portion 57. By using such a shape, even if the size of the expansion portion 53 of the convex portion 50 is larger than the size of the entrance portion 31 of the concave portion 30, by press-fitting the convex portion 50 into the concave portion 30, the inclination of the bulging portion 57 causes the expansion portion 53 to deform, allowing for direct insertion and joining. FIG. 4(d) shows a modified example of the positions of the convex portions 50 and the concave portions 30. In the case of a typical raft-like structure, the convex portion 50 and the concave portion 30 need only be positioned opposite each other. However, if you want to create a curved structure such as a joinery or a box structure, it is more convenient to arrange them at an angle according to that. FIG. 4(d) shows an example in which the protrusion 50 and recess 30 are located at the corner of a box structure, and are arranged at an angle of 90 degrees with respect to the central axis of the core material 1 when it is made into a cylinder. By creating a core material 1 with such a structure, it is possible to easily construct surface structures other than simple flat surfaces using the core material 1. In other words, this structure is a cylindrical core material used as a core material structure. core The side of the support has a recess formed in the longitudinal direction, and a back split groove is provided at a position on the side that is more than 90 degrees away from the recess with respect to the center of the cylinder. Convex forming grooves are provided on both sides of the back split groove parallel to the back split groove, and two convex forming grooves are provided. Narumizo and has a convex portion generated by core The recesses and protrusions of the support members are structured so that they can be joined together.

[0029] Referring to FIG. 6, a structure for maintaining the opening amount of the spine slit and restricting the decrease in the opening amount will be described. The core wood structure 2 is made by joining core wood pieces 1 together at the recesses 30 and protrusions 50 (FIG. 6(a)). After that, by drying, the back split grooves 40 open, and the recesses 30 and protrusions 50 come into close contact (FIG. 6(b)). In this state, the core material structure 2 can be used for various purposes. If each core material 1 weighs several kilograms, then connecting five to ten core materials will result in a core material structure 2 weighing over ten kilograms to several tens of kilograms. When handling the core material structure 2, the core materials 1 will not separate because they are joined by a dovetail structure, but depending on how the core material structure 2 is held, load may be applied to the convex portion 50 including the back split groove 40, causing the back split groove 40 to move in the direction of returning to its original opening, i.e., in the direction of closing the groove. This may cause the joints between the core materials 1 to loosen at the recesses 30 and protrusions 50, causing the core materials to no longer line up in a straight line, resulting in the entire core material structure 2 becoming distorted. Therefore, in order to prevent the back split groove 40 from closing and returning to its original opening, after the joining of the core materials is completed, a regulating body 71 that regulates the closing of the back split groove is inserted into the back split groove from the end of the core material. By inserting the regulating body 71, the spine slit does not close, the joint between the recessed portion 30 and the protruding portion 50 does not loosen, and the entire core material structure 2 maintains a flat structure. The restricting body 71 may be, for example, a wedge 72. By inserting the wedge 72 into the groove 40 in a size that allows it to be inserted from the end, the groove 40 is restricted from moving in the closing direction (FIGS. 6(c) and 6(e)). Alternatively, a filling type adhesive 73 may be used. By putting the filling type adhesive 73 into the groove 40 and hardening it, the groove 40 is restricted from moving in the closing direction (FIG. 6(d)). In the case of the wedge material 72, in addition to restricting the closing of the groove, it also has the effect of biasing the slit groove 40 in the direction of opening. By biasing the slit groove 40 in the direction of opening, the joint between the recessed portion 30 and the protruding portion 50 can be made stronger. Furthermore, in the case of wedge material 72, even before the core material structure 2 dries, it can be driven into the back-split groove 40 from the end, forcibly opening the back-split groove 40, bringing the recess 30 and the protrusion 50 into tight contact, and forcibly creating the shape that will be achieved after drying, thereby improving production efficiency.

[0030] Fig. 5 shows an example using a core material structure 2. The core material structure 2 is made by joining core materials 1 together. Fig. 5(a) shows an example of a house wall 80. By joining core timbers 1 in a straight line, a wall structure can be easily constructed. Figure 5(b) is an example of a house 82 (house, log house). Generally, a log house is made of logs, but since it is simply made of piled logs, it remains unstable. In the structure of this embodiment, the core members 1 are firmly joined together, making it possible to build a house with high strength. Figure 5(c) shows an example of a tabletop for a desk 81 made from a core wood structure 2. By shaving one side of the core wood structure 2 and flattening it, a desk 81 with a flat surface can be made. Simply lining up logs often does not provide the strength required for a tabletop. With the structure of this example, the bond strength between the core wood pieces 1 is high, making it possible to make a stable desk 81.

[0031] Thus, according to the present invention, core materials can be easily combined and stably formed into a plate or wall shape.

[0032] Furthermore, according to the present invention, the convex portion has a back split, and as the convex portion dries, the back split opens, opening the convex portion, thereby making the bond stronger.

[0033] Furthermore, according to the present invention, by changing the positions of the convex portion and the concave portion, bonding can be performed at any angle, thereby increasing the degree of freedom when creating a structure.

[0034] Furthermore, according to the present invention, the size of the end of the convex portion is made smaller than the size of the entrance of the concave portion, thereby enabling smooth joining.

[0035] Furthermore, according to the present invention, by forming the convex portion into a dovetail, T-shape, or bulge shape and forming the concave portion into a corresponding shape, separation after joining can be prevented. [Industrial Applicability]

[0036] It is understood that the core material of the present invention has great industrial applicability as an invention for producing high-strength structures. [Explanation of symbols]

[0037] 1 Heartwood 2. Core wood structure 10 End face 11 Side 20 First joint structure 21 Second joint structure 30 recess 31 Entrance 32 Deep 33 Widening section 34 Inner surface of recess 35 Dovetail groove 36 T-shaped groove 40 Back split groove 50 convex part 51 Base 52 End 53 Extension 54 Convex side 55 Dovetail 56 T-shaped 57 Bulge 60 Convex portion forming groove 61 Bottom 62 External surface 70 Adhesive 71 Regulatory Body 72 Wedge material 73 Filled adhesive 80 Fence 81 desk 82 house

Claims

1. A core material used as a core material structure, A recess is formed in the longitudinal direction on the side of the cylindrical core material, and a back split groove is provided at a position on the side surface that is 90 degrees or more away from the recess with respect to the center of the cylinder, This core-supporting material is characterized in that convex portion forming grooves are provided on both sides of the spine-splitting groove parallel to the spine-splitting groove, and has convex portions generated by the two convex portion forming grooves, and the concave portions and convex portions of the core-supporting materials can be joined together.

2. When the core materials are joined together by the convex portion and the concave portion, the side surface of the convex portion and the inner peripheral surface of the concave portion come into contact with each other, or after joining, the core materials dry, causing the back split groove to open, 2. The core-bearing material according to claim 1, wherein the side surfaces of the convex portions and the inner peripheral surfaces of the concave portions are in contact with each other.

3. A core material as described in claim 2, characterized in that in the width direction of the core material, the convex portion has an extended portion at the end side that is longer than the base portion, and the concave portion has an extended portion at the back that is longer than the entrance portion.

4. When the core materials are joined together, the inlet portion is longer than the expanded portion in the width direction, and after joining, by drying the core materials, 4. The core material according to claim 3, wherein the back slit is opened and the length of the expanded portion is longer than the length of the inlet portion.

5. 4. The core material according to claim 3, wherein the recess has a dovetail shape, and the protrusion has a dovetail shape corresponding to the dovetail shape.

6. 4. The core material according to claim 3, wherein the recess has a T-shaped groove shape, and the protrusion has a T-shape corresponding to the shape of the T-shaped groove.

7. The core material described in claim 3, characterized in that the convex portion forming groove consists of the convex portion side surface, bottom surface and outer surface, and the edge of the outer surface abuts against the side surface of the corresponding core material when the core materials are joined together.

8. The core material described in claim 3, characterized in that the convex portion forming groove consists of the convex portion side surface and an outer surface, and at least a portion of the outer surface abuts against the side surface of the corresponding core material when the core materials are joined together.

9. 4. The heartwood according to claim 3, wherein the heartwood is thinned wood.

10. A core structure comprising two cores according to any one of claims 1 to 9 joined together.

11. 11. The core structure according to claim 10, wherein when the core members are joined together, an adhesive is applied to the joined portions.

12. A core material structure as described in claim 10, characterized in that after the core materials are joined together, a regulating body that regulates the closure of the back split groove is inserted into the back split groove from the end of the core material.

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