Laminated log structures for wooden buildings

Abstract

To provide a laminated structure of logs for wooden buildings that improves waterproofing and airtightness. [Solution] A laminated structure of logs for wooden buildings, comprising: a first log (10) having a cross end (12) with a sloping upper surface (12S); a second log (20) having a sloping lower surface (22S) that is stacked and placed on the cross end (12) so that the sloping lower surface (22S) faces the sloping upper surface (12S), and which forms a cross end (22) that, together with the cross end (12), constitutes an exterior wall corner of the wooden building (100); and an exterior panel (30) that is provided along the exterior wall corner of the wooden building (100) and covers at least the gap between the sloping upper surface (12S) and the sloping lower surface (22S).

Description

[Technical Field]

[0001] The present invention relates to a laminated structure of logs for wooden buildings. [Background technology]

[0002] Patent Document 1 below discloses a log house, which is a wooden building constructed by the dovetail notch method. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-98440 Summary of the Invention [Problem to be solved by the invention]

[0004] In the dovetail notch method, the logs are stacked with their sloped surfaces abutting each other to improve the joint strength between them. However, this configuration presents a problem: moisture, such as rainwater, can easily penetrate between the logs along the sloped surfaces. Another problem is that outside air can enter through small gaps between the logs, reducing the airtightness.

[0005] The present invention has been made in view of the above problems, and an object of the present invention is to provide a laminated structure of logs for wooden buildings which improves waterproofing and airtightness. [Means for solving the problem]

[0006] (1) A laminated structure of logs for a wooden building, comprising: a first log having a first cross end with a sloping upper surface; a second log having a sloping lower surface, stacked and placed on the first cross end with the sloping lower surface facing the sloping upper surface, and having a second cross end that forms an exterior wall corner of the wooden building together with the first cross end; and an exterior panel arranged along the exterior wall corner, covering at least the gap between the sloping upper surface and the sloping lower surface.

[0007] (2) In (1), a laminated structure in which a first fitting groove extending vertically is formed in the first log material, a second fitting groove extending vertically is formed in the second log material, and a first fitting protrusion that fits into the first fitting groove and a second fitting protrusion that fits into the second fitting groove are formed in the exterior panel.

[0008] (3) In (2), the exterior plate has a first exterior portion on which the first mating protrusion is provided and a second exterior portion on which the second mating protrusion is provided, and the first exterior portion and the second exterior portion are separate from each other and are joined to each other by a first joining inclined surface formed on the first exterior portion and a second joining inclined surface formed on the second exterior portion abutting against each other.

[0009] (4) In any one of (1) to (3), the exterior panels are arranged to extend vertically from the highest log to the lowest log among the plurality of stacked first logs and the plurality of stacked second logs.

[0010] (5) In any of (1) to (4), a laminated structure further includes a waterproof and airtight seal interposed between the exterior plate and the first intersecting end and the second intersecting end, covering at least the gap between the inclined upper surface and the inclined lower surface. [Effects of the Invention]

[0011] According to the above aspects (1) to (5) of the present invention, it is possible to improve waterproofing and also contribute to improving airtightness by suppressing leakage of outside air. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is an external perspective view showing an example of a log house according to an embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view showing a state in which first logs and second logs are stacked. [Figure 3] FIG. 2 is a left side view showing a state in which first logs and second logs are stacked. [Figure 4] FIG. 2 is a front view showing a state in which the first and second logs are stacked. [Figure 5] FIG. 2 is a perspective view showing a first log. [Figure 6] FIG. 10 is a perspective view showing a second log. [Figure 7] FIG. 10 is a perspective view showing a state in which exterior panels are attached to the corners of the exterior walls of a log house. [Figure 8] FIG. [Figure 9] FIG. 10 is a perspective view showing the log house with exterior panels removed from the corners of its exterior walls. [Figure 10] This is a diagram showing a waterproof and airtight seal installed at the corner of the exterior wall of a log house. DETAILED DESCRIPTION OF THE INVENTION

[0013] An embodiment of the present invention (hereinafter referred to as the present embodiment) will be described in detail with reference to the drawings. The drawings may show the width, thickness, shape, etc. of each part in a schematic manner compared to the actual embodiment, but these are merely examples and are not intended to limit the interpretation of the present invention.

[0014] [Log House 100 Overview] Fig. 1 is an external perspective view showing an example of a log house according to this embodiment. The layered structure of the log house 100, which is a wooden building, includes multiple first logs 10 and multiple second logs 20, which are stacked alternately using the so-called dovetail notch construction method. In this embodiment, the entrance side of the log house 100 is referred to as the "front side," the opposite side as the "rear side," the right side when facing the front side as the "right side," and the opposite side as the "left side."

[0015] The first logs 10 extend in the left-right direction. The second logs 20 extend in the front-rear direction. That is, the first logs 10 and the second logs 20 are arranged so as to intersect with each other.

[0016] The first logs 10 and the second logs 20 are stacked alternately to form walls W. The walls W constitute the interior and exterior wall surfaces of the log house 100. By using the dovetail notch method, the notched portions of the logs do not protrude outward from the exterior wall surfaces, allowing the building's exterior shape to be compact.

[0017] [Details of the first log 10 and the second log 20] Fig. 2 is a perspective view showing the first and second logs stacked together. Fig. 3 is a left side view showing the first and second logs stacked together. Fig. 4 is a front view showing the first and second logs stacked together. Fig. 5 is a perspective view showing the first log. Fig. 6 is a perspective view showing the second log.

[0018] The first log 10 has an extension portion 11 extending in the left-right direction and a cross end portion 12 formed at the left end of the extension portion 11. The cross end portion 12 is narrower in the up-down direction than the extension portion 11 and protrudes leftward from the extension portion 11.

[0019] The upper surface of the intersecting end portion 12 is an inclined surface (hereinafter referred to as inclined upper surface 12S) that is inclined in the front-rear and left-right directions so that the front right side is the lowest. Specifically, the inclined upper surface 12S is inclined with respect to the horizontal plane so as to gradually decrease from the leading end to the trailing end of the intersecting end portion 12 (from the left end to the right end), and is also inclined with respect to the horizontal plane so as to gradually decrease from one end in the width direction of the intersecting end portion 12 to the other end (from the rear end to the front end in the front-rear direction).

[0020] The second log 20 has an extension portion 21 extending in the front-to-rear direction and a cross end portion 22 formed at the front end of the extension portion 21. The cross end portion 22 has a smaller width in the up-down direction than the extension portion 21 and is a portion that protrudes forward from the extension portion 21.

[0021] The lower surface of the intersecting end portion 22 faces the inclined upper surface 12S and forms an inclined surface (hereinafter referred to as inclined lower surface 22S) that is inclined in the front-rear and left-right directions so that the front right side is lowest.

[0022] The lower surface of the cross end 12 preferably has a slope that is approximately symmetrical in the vertical direction with the sloped upper surface 12S. The upper surface of the cross end 22 preferably has a slope that is approximately symmetrical in the vertical direction with the sloped lower surface 22S. This configuration allows vertically adjacent logs to be stacked alternately without gaps. While the illustrated example shows an example in which the tip surface of the cross end 12 is flush with the side surface of the cross end 22, and the tip surface of the cross end 22 is flush with the side surface of the cross end 12, this is not limiting. For example, the tip surface of the cross end 12 may protrude or recess from the cross end 22, as long as it does not significantly affect the external shape of the log house 100.

[0023] [Waterproof and airtight seal] The laminated structure of logs for the log house 100 has a waterproof and airtight seal WS1 interposed between the sloped upper surface 12S and the sloped lower surface 22S, extending along the outer edge of the opposing area of ​​these surfaces. The waterproof and airtight seal WS1 is preferably a sealing material with an adhesive layer on one side, and is attached to the crossing end 12. The waterproof and airtight seal WS1 may be a sheet-like seal made of, for example, EPDM (ethylene propylene rubber).

[0024] The waterproof and airtight seal WS1 includes a strip-shaped first sheet portion WS11 along the left edge of the sloped upper surface 12S (the tip of the first intersecting end portion 12), a strip-shaped second sheet portion WS12 along the front edge of the sloped upper surface 12S (the other end in the width direction of the first intersecting end portion 12), and a strip-shaped third sheet portion WS13 along the right edge of the sloped upper surface 12S. The second sheet portion WS12 is preferably connected to the first sheet portion WS11 on the front left side and to the third sheet portion WS13 on the front right side.

[0025] The laminated structure of logs for the log house 100 further includes a strip-shaped waterproof and airtight seal WS14 along the left edge at the rear surface of the cross end portion 12. The upper end of the waterproof and airtight seal WS14 is preferably connected to the rear end of the first sheet portion WS11.

[0026] The laminated structure of logs for the log house 100 also includes a waterproof and airtight seal WS2 interposed between the sloping upper surface of the crossing end 22 of the second log 20 and the sloping lower surface of the end of the first log (not shown) placed above the second log 20, and extending along the outer edge of the opposing area between these surfaces. The waterproof and airtight seal WS2 is preferably a sealing material with an adhesive layer on one side, and is attached to the crossing end 22. The waterproof and airtight seal WS2 may be a sheet-like seal made of, for example, EPDM (ethylene propylene rubber).

[0027] The waterproof and airtight seal WS2 includes a first sheet portion WS21 that fits along the front edge of the sloped upper surface of the intersecting end portion 22, a second sheet portion WS22 that fits along the left edge of the sloped upper surface of the intersecting end portion 22, and a third sheet portion WS23 that fits along the rear edge of the sloped upper surface of the intersecting end portion 22. The second sheet portion WS22 is preferably connected to the first sheet portion WS21 on the left front side and connected to the third sheet portion WS23 on the left rear side.

[0028] The laminated structure of logs for the log house 100 further includes a strip-shaped waterproof and airtight seal WS24 along the front edge on the right surface of the cross end 22. The upper end of the waterproof and airtight seal WS24 is preferably connected to the right end of the first sheet portion WS21.

[0029] The provision of waterproof and airtight seals WS1 and WS2 prevents rainwater and other moisture from penetrating between the stacked first and second logs 10 and 20 through the outer edges of the opposing logs. Furthermore, the provision of waterproof and airtight seals WS14 and WS24 prevents rainwater and other moisture from penetrating between the logs from all gaps formed between the first and second logs 10 and 20. The waterproof and airtight seals also seal any small gaps that may occur between the logs, thereby improving airtightness by preventing outside air from leaking in.

[0030] 5 and other figures, the extension portion 11 has a rising surface 11R that rises from the end of the inclined upper surface 12S, and the third sheet portion WS13 is provided along the boundary between the inclined upper surface 12S and the rising surface 11R. This prevents the moisture from seeping into the extension portion 11 even if the moisture penetrates the inclined upper surface 12S.

[0031] The waterproof and airtight seals WS1 and WS2 also cushion the localized pressure on the sloped surfaces when piling up the logs, helping to prevent rattling after stacking. Furthermore, the elasticity of the waterproof and airtight seals increases the adhesion between the stacked surfaces, sealing the tiny gaps between the logs and contributing to improved airtightness.

[0032] As shown in the figure, waterproof and airtight seals are attached to the upper surfaces of the cross ends 12 of the first log 10 and the upper surfaces of the cross ends 22 of the second log 20, respectively, but waterproof and airtight seals are not attached to the undersides of the cross ends 12 and 22. This avoids unnecessary duplication of waterproof and airtight seals. As long as waterproof and airtight seals are interposed between the logs as in the example shown, waterproof and airtight seals may be attached to the undersides of the cross ends 12 and 22, respectively, and not necessarily to the upper surfaces of the cross ends 12 and 22.

[0033] The illustrated waterproof and airtight seals WS1 and WS2 are merely examples and are not intended to be limiting. For example, the waterproof and airtight seal WS1 may be provided extending along at least a portion of the outer edge of the inclined upper surface 12S. Furthermore, in addition to the illustrated waterproof and airtight seals, a strip-shaped waterproof and airtight seal may be provided.

[0034] [Drain hole] As described above, the provision of a waterproof and airtight seal can prevent moisture from entering between the logs. However, once moisture has entered between the logs, it may be blocked by the waterproof and airtight seal and remain trapped between the logs. This could lead to corrosion of the logs. Therefore, the laminated structure of this embodiment employs a configuration in which drainage holes are formed in each log to allow moisture to escape. This will be explained in detail below.

[0035] The intersecting end portion 12 is formed with a drain hole h11 (first drain hole) that opens at a low position on the inclined upper surface 12S and a drain hole h12 that opens at a high position as through holes that extend in the vertical direction.

[0036] Specifically, the drain hole h11 opens at a position adjacent to the corner of the second sheet portion WS12 and the third sheet portion WS13. That is, the drain hole h11 opens at the lowest position in the sloped upper surface 12S, in an area where the waterproof and airtight seal WS1 is not provided.

[0037] The drain hole h12 is opened at a position on the inclined upper surface 12S that is diagonally opposite to the position where the drain hole h11 is formed.

[0038] In addition, the intersecting end portion 22 is formed with drainage hole h21 (second drainage hole) that opens at a low position on the sloping upper surface of the intersecting end portion 22, and drainage hole h22 (third drainage hole) that opens at a high position on the sloping upper surface of the intersecting end portion 22, as through holes extending in the vertical direction.

[0039] The drain hole h21 opens at a position adjacent to the corner of the second sheet portion WS22 and the third sheet portion WS23. That is, the drain hole h21 opens at the lowest position in the sloped upper surface of the intersecting end portion 22, in an area where the waterproof and airtight seal WS2 is not provided.

[0040] The drain hole h22 is formed on the inclined upper surface of the intersecting end portion 22 at a position diagonal to the position where the drain hole h21 is formed.

[0041] Furthermore, drainage hole h22 is formed on the same vertical axis O1 as drainage hole h11 and is connected to drainage hole h11. Drainage hole h21 is formed on the same vertical axis O2 as drainage hole h12 and is connected to drainage hole h12. With this configuration, even if moisture penetrates the sloped surface, it can be drained downward through the drainage holes. The moisture can be drained to the ground through the drainage holes of the lowest log. Furthermore, the lowest log has horizontal drainage holes (horizontal drainage holes) that are connected to the vertical drainage holes. These horizontal drainage holes open to the side of the log, allowing moisture that falls through the vertical drainage holes to be reliably discharged outside the log. This prevents moisture from accumulating between the logs.

[0042] [Exterior panel (notch cover)] Next, with reference to Fig. 1 and Figs. 7 to 9, the exterior panels 30 attached to the corners of the exterior walls of the log house 100 will be described. Fig. 7 is a perspective view showing the exterior panels attached to the corners of the exterior walls of the log house. Fig. 8 is a top view of the exterior panels as seen from above. Fig. 9 is a perspective view showing the exterior panels removed from the corners of the exterior walls of the log house. Figs. 7 and 9 show three first logs 10 (10A to 10C) and two second logs 20 (20A to 20B) stacked one on top of the other. Note that in Figs. 7 and 9, the top and bottom surfaces of each log are shown as flat surfaces for simplification.

[0043] As shown in Figure 9, the extension 11A of the first log 10A has a vertically extending fitting groove G1A. The extension 11B of the first log 10B has a vertically extending fitting groove G1B. The extension 11C of the first log 10C has a vertically extending fitting groove G1C. These fitting grooves G1A, G1B, and G1C are formed on the same vertical line.

[0044] As shown in Fig. 9, a vertically extending fitting groove G2A is formed in the extension 21A of the second log 20A. A vertically extending fitting groove G2B is formed in the extension 21B of the second log 20B. The fitting grooves G2A and G2B are formed on the same vertical line.

[0045] The exterior panel 30 has a first exterior portion 31 that covers the leading end surfaces of the first logs 10A-10C and a second exterior portion 32 that covers the leading end surfaces of the second logs 20A-20B at the exterior wall corners of the log house 100, which are formed by the intersecting ends 12 and 22. In this embodiment, the first exterior portion 31 and the second exterior portion 32 are separate from each other. The first exterior portion 31 and the second exterior portion 32 abut each other at their joint inclined surfaces in a mitered manner, forming a substantially L-shape that fits along the exterior wall corners.

[0046] The first exterior portion 31 includes a plate-like portion 311 that fits along the tip end surfaces of the first logs 10A to 10C, and a fitting protrusion 312 that protrudes from one end of the plate-like portion 311 and fits into the fitting grooves G2A to G2B. The fitting protrusion 312 extends vertically and fits continuously into the fitting grooves G2A to G2B.

[0047] The second exterior portion 32 includes a plate-like portion 321 that fits along the tip end surface of the second logs 20A-20B, and a fitting protrusion 322 that protrudes from one end of the plate-like portion 321 and fits into the fitting grooves G1A-G1C. The fitting protrusion 322 extends vertically and fits continuously into the fitting grooves G1A-G1C.

[0048] Furthermore, a joining inclined surface 311a is formed on plate-shaped portion 311, and a joining inclined surface 321a is formed on plate-shaped portion 321, and these joining inclined surfaces abut against each other at the corners of the exterior corners, thereby joining plate-shaped portion 311 and plate-shaped portion 321 to each other. Joining inclined surface 311a and joining inclined surface 321a may be fixed to each other by, for example, an adhesive or the like.

[0049] As shown in Fig. 1, the exterior panels 30 may be provided at the corners of the exterior walls of the log house 100, from the upper end to the lower end. Specifically, the exterior panels 30 may be provided extending vertically from the highest log to the lowest log among the stacked first logs 10 and second logs 20. The exterior panels 30 do not have to be continuous in the vertical direction, but may be composed of multiple panels that can be separated in the vertical direction. Furthermore, the exterior panels 30 may be provided at each of the four corners of the exterior walls of the log house 100.

[0050] By using the exterior panels 30 described above, it is possible to prevent moisture such as rainwater from penetrating between the stacked logs through the outer edges of the opposing areas of the first and second logs 10 and 20. This also improves the airtightness of the log house 100. Furthermore, the exterior panels 30 create a columnar appearance at the corners of the exterior walls of the log house 100, thereby contributing to improving the aesthetic appearance of the building.

[0051] The exterior panels 30 are not limited to the configuration shown in the figure, and may be provided along the corners of the exterior walls of the log house 100, covering at least the gap between the upper slope surface 12S and the lower slope surface 22S. The exterior panels 30 are preferably made of wood, but may be made of other materials as long as they are waterproof.

[0052] In the present embodiment, an example has been described in which fitting grooves are formed in each log and fitting protrusions are formed in the exterior panels, but this is not limiting. For example, fitting protrusions may be formed in each log, and fitting grooves into which the fitting protrusions fit may be formed in the exterior panels. Furthermore, the exterior panels 30 and each log may not only be fitted together, but may also be fixed using fasteners such as screws or bolts.

[0053] 10, waterproof and airtight seals 40 may be attached to the corners of the exterior walls of the log house 100. This can further improve waterproofing and airtightness. The waterproof and airtight seals 40 may be, for example, butyl tape whose main component is butyl rubber.

[0054] The waterproof and airtight seal 40 is preferably provided between the cross end portions 12 and 22 and the exterior panel 30. In addition, both edges of the waterproof and airtight seal 40 are preferably adjacent to the fitting grooves formed in each log.

[0055] 10 shows an example in which the waterproof airtight seal 40 is provided so as to cover the entire tip surface of the intersecting end 12 and the tip surface of the intersecting end 22, but is not limited to this. The waterproof airtight seal 40 is preferably provided along the corners of the exterior wall of the log house 100, and is preferably provided so as to cover at least the gap between the sloped upper surface 12S and the sloped lower surface 22S.

[0056] [others] The waterproof and airtight seals and waterproof holes described with reference to Figures 1 to 6 do not have to be provided. In other words, it is sufficient that the exterior plate 30 is at least capable of preventing moisture from entering from the outer edge of the sloped surface of the crossing end portion.

[0057] In this embodiment, an example is shown in which the first log material 10 and the second log material 20 have inclined surfaces that slope in two directions (front-to-back and left-to-right directions), but this is not limited to this, and the inclination direction of the inclined surfaces may be in one direction. [Explanation of symbols]

[0058] 10 first log material, 11 extension portion, 12 cross end portion, 12S sloped upper surface, 20 second log material, 21 extension portion, 22 cross end portion, 22S sloped lower surface, 30 exterior plate, 31 first exterior portion, 311 plate-shaped portion, 312 mating protrusion portion, 32 second exterior portion, 321 plate-shaped portion, 322 mating protrusion portion, 40 waterproof and airtight seal, G1A to G1C, G2A to G2B mating groove portion, WS1, WS2 waterproof and airtight seal, 100 log house.

Claims

1. a first log having a first cross end portion formed thereon with a sloped upper surface; a second log having a sloped lower surface, stacked and placed on the first cross end portion so that the sloped lower surface faces the sloped upper surface, and forming a second cross end portion that, together with the first cross end portion, constitutes an outer wall corner of the wooden building; an exterior plate provided along the outer wall corner and covering at least a gap between the sloped upper surface and the sloped lower surface; A laminated structure of logs for wooden buildings.

2. The first log has a first fitting groove formed therein, the first fitting groove extending in a vertical direction. The second log has a second fitting groove formed therein that extends vertically. The exterior plate is formed with a first fitting protrusion that fits into the first fitting groove and a second fitting protrusion that fits into the second fitting groove. The laminate structure of claim 1 .

3. the exterior plate has a first exterior portion on which the first fitting protrusion is provided and a second exterior portion on which the second fitting protrusion is provided, the first exterior portion and the second exterior portion are separate from each other, and a first joining inclined surface formed on the first exterior portion and a second joining inclined surface formed on the second exterior portion are in contact with each other and joined to each other; The laminate structure of claim 2 .

4. The exterior boards are provided extending vertically from the highest log to the lowest log among the plurality of stacked first logs and the plurality of stacked second logs. The laminate structure according to any one of claims 1 to 3.

5. The structure further includes a waterproof and airtight seal interposed between the exterior plate and the first and second intersecting ends, and covering at least a gap between the sloped upper surface and the sloped lower surface. The laminate structure according to any one of claims 1 to 3.

Images