Laminated log structures for wooden buildings

Abstract

To provide a laminated structure of logs for wooden buildings that improves waterproofing. [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) and a cross end (22) that is stacked and placed on the cross end (12) so that the sloping lower surface (22S) faces the sloping upper surface (12S); and a waterproof and airtight seal (WS1) interposed between the sloping upper surface (12S) and the sloping lower surface (22S) and extending along at least a portion of the outer edge of the opposing area of ​​these surfaces.

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. This configuration presents a problem: moisture, such as rainwater, can easily penetrate between the logs along the sloped surfaces. Furthermore, small gaps between the logs allow outside air to enter, reducing the airtightness and impairing the performance of the house.

[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 use in wooden buildings, comprising: a first log having a first cross end portion with a sloped upper surface; a second log having a sloped lower surface with a second cross end portion stacked on the first cross end portion so that the sloped lower surface faces the sloped upper surface; and a waterproof and airtight seal interposed between the sloped upper surface and the sloped lower surface and extending along at least a portion of the outer edge of the opposing area of ​​these surfaces.

[0007] (2) In (1), the inclined upper surface is a surface that is inclined with respect to the horizontal plane so as to gradually lower from the tip to the end of the first intersecting end, and is also inclined with respect to the horizontal plane so as to gradually lower from one end of the first intersecting end in the width direction to the other end, and the waterproof and airtight seal has a laminated structure that includes a strip-shaped first sheet portion that follows at least the tip of the first intersecting end.

[0008] (3) In (2), the waterproof and airtight seal further includes a strip-shaped second sheet portion along the other end of the first intersecting end portion.

[0009] (4) In (3), the first log material includes a first extension portion having an upright surface rising from the end of the inclined upper surface, and the waterproof and airtight seal further includes a band-shaped third sheet portion along the boundary between the inclined upper surface and the upright surface.

[0010] (5) In any one of (1) to (4), the first intersecting end portion has a first drainage hole formed therein that opens at a position with a low gradient on the sloped upper surface and penetrates in the vertical direction.

[0011] (6) In (5), the second sheet portion and the third sheet portion are connected to form a corner, and the first drainage hole opens at a position adjacent to the corner.

[0012] (7) In any of (1) to (6), the first drainage hole is located in an area of ​​the sloped upper surface where the waterproof and airtight seal is not provided, and is opened at the position with the lowest slope.

[0013] (8) In any one of (1) to (7), the second intersecting end portion has a second drainage hole formed therein that opens at a position on the sloped lower surface where the slope is high and penetrates vertically.

[0014] (9) In any one of (1) to (8), the laminated structure has a third drainage hole formed in the second intersecting end portion, the third drainage hole being formed on the same vertical axis as the first drainage hole.

[0015] (10) In any one of (1) to (9), the laminated structure has a water guide groove formed on the inclined upper surface to guide moisture accumulated on the inclined upper surface to the first drainage hole.

[0016] (11) In (10), the water guide grooves include a first water guide groove along the second sheet portion and a second water guide groove along the third sheet portion.

[0017] (12) In (11), the first drainage hole is opened at an intersection groove portion where the first water guide groove and the second water guide groove intersect. [Effects of the Invention]

[0018] According to the above aspects (1) to (12) of the present invention, waterproofing can be improved, and airtightness can also be improved by suppressing air from entering through gaps between the logs. [Brief explanation of the drawings]

[0019] [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 diagram showing a first log material of a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0020] 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.

[0021] [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."

[0022] 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.

[0023] 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.

[0024] [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.

[0025] 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.

[0026] 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).

[0027] 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.

[0028] 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.

[0029] 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.

[0030] [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).

[0031] 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.

[0032] 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.

[0033] 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).

[0034] 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.

[0035] 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.

[0036] 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 in all gaps formed between the first and second logs 10 and 20. These 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] [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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] [Variations] Fig. 7 is a diagram showing a first log material of a modified example. Note that components having the same functions as those shown in Figs. 1 to 6 are given the same reference numerals, and detailed description thereof will be omitted.

[0050] In this modified example, water guide grooves g1 and g2 are formed on the inclined upper surface 112S of the first log 110. The water guide grooves g1 and g2 are grooves for guiding water that has entered the inclined upper surface 112S to the drainage hole h111.

[0051] The water guide groove g1 is formed along the second sheet portion WS12 and adjacent to the second sheet portion WS12. The water guide groove g2 is formed along the third sheet portion WS13 and adjacent to the third sheet portion WS13. The drain hole h111 opens at the intersecting groove portion where the water guide groove g1 and the water guide groove g2 intersect.

[0052] In the configuration of the modified example, moisture that has entered between the logs can be efficiently and reliably discharged to the outside through the drainage holes.

[0053] [others] As shown in Figure 2 and other figures, in the log house 100, the extension 11 of the first log 10 has a fitting groove G1 extending in the vertical direction, and the extension 21 of the second log 20 has a fitting groove G2 extending in the vertical direction, and an exterior cover plate C (see Figure 1) is provided to be fitted into these grooves and fixed. The exterior cover plate C is preferably an L-shaped longitudinal member extending vertically along the corner of the log house 100 formed by the crossing end 12 and the crossing end 22. The use of the exterior cover plate C can further improve waterproofing.

[0054] 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.

[0055] Furthermore, the position where the drain hole h11 opens is not limited to the position with the lowest gradient on the inclined upper surface 12S. In this case, it is preferable that a water guide groove be formed on the inclined upper surface 12S so as to guide moisture to the opening of the drain hole h11. [Explanation of symbols]

[0056] 10 first log material, 11 extension portion, 12 cross end, 12S upper slope surface, 20 second log material, 21 extension portion, 22 cross end, 22S lower slope surface, 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 and a second cross end formed thereon, the second log being stacked on the first cross end so that the sloped lower surface faces the sloped upper surface; a waterproof and airtight seal interposed between the upper and lower sloped surfaces and extending along at least a portion of the outer edges of the opposing areas of these surfaces; having Laminated log structure for wooden buildings.

2. the inclined upper surface is a surface that is inclined with respect to a horizontal plane so as to gradually become lower from the tip to the end of the first intersecting end portion, and is also inclined with respect to a horizontal plane so as to gradually become lower from one end of the first intersecting end portion in a width direction to the other end thereof, The waterproof and airtight seal includes a strip-shaped first sheet portion along at least the tip of the first cross end portion. The laminate structure of claim 1 .

3. The waterproof and airtight seal further includes a strip-shaped second sheet portion along the other end of the first intersecting end portion. The laminate structure of claim 2 .

4. the first log includes a first extending portion having an upstanding surface that rises from an end of the sloped upper surface; The waterproof and airtight seal further includes a band-shaped third sheet portion along the boundary between the inclined upper surface and the upright surface. The laminate structure of claim 3 .

5. The first intersecting end portion has a first drain hole formed therein, the first drain hole opening at a position of the sloped upper surface where the slope is low and penetrating in the vertical direction. The laminate structure of claim 4.

6. the second sheet portion and the third sheet portion are connected to form a corner portion, The first drain hole opens at a position adjacent to the corner portion. The laminate structure of claim 5 .

7. The first drainage hole is opened in an area of ​​the sloped upper surface where the waterproof and airtight seal is not provided and at a position with the lowest slope. The laminate structure of claim 5 .

8. The second intersecting end portion has a second drainage hole that opens at a position where the slope of the sloped lower surface is high and penetrates in the vertical direction. The laminate structure of claim 5 .

9. A third drain hole is formed in the second intersecting end portion, the third drain hole being formed on the same vertical axis as the first drain hole. The laminate structure of claim 8.

10. A water guide groove is formed on the inclined upper surface to guide moisture accumulated on the inclined upper surface to the first drain hole. The laminate structure of claim 5 .

11. The water guide grooves include a first water guide groove along the second sheet portion and a second water guide groove along the third sheet portion. The laminate structure of claim 10.

12. The first drainage hole opens at an intersecting groove portion where the first water guide groove and the second water guide groove intersect. The laminate structure of claim 11.

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