JP4783368B2 - Log for log house and log wall structure - Google Patents

Description

  The present invention relates to a log for a log house and a wall structure using the log.

  The log house is notched at the top and bottom near both ends, such as square logs with square or square cross section (square log) and round logs with round cross section (round log). Another log is arranged on the upper notch member of the log so as to intersect the log and to fit the lower notch member on the upper notch member of the log. By repeating this, the wall of the log house can be formed.

  For example, Patent Literature 1 discloses a wall structure of a log house in which the opposite vertices of a square log are directed vertically upward and downward.

  Known notches include round notches, saddle notches, wedge notches, and square notches. For example, the lounge notch is often used for a round log, and the lower end of the log is cut so as to match the shape of the upper log. The wedge notch cuts the log diagonally to form a scarf so that the intersection of the logs is flat.

In addition, the square notch cuts the upper and lower portions near both ends of the log by a predetermined ratio to form an upper notch member and a lower notch member. For example, as the upper notch member and the lower notch member, by cutting the material by 1/4 of the log height, the log height between the upper notch member and the lower notch member is ½ of the log height. A longitudinally extending connection is formed having a height.
JP 2003-119930 A JP 2004-124438 A

  As the material is shaved, the contact surface between the upper notch member of the lower log and the lower notch member of the upper log can be increased, and the log can be firmly fitted. On the other hand, as the material is shaved, the connecting portion between the upper notch member and the lower notch member becomes smaller, so the strength of the connecting portion is reduced, and a large force may be applied to break the portion. Becomes larger. If the notch of the notch member is small in order to make the connecting portion large (that is, if the material is not sufficiently cut), the fitting of the upper and lower logs is weak and a gap is likely to be formed. If there is a gap, there is a possibility that rain or the like may permeate there, and the material may be spoiled.

  For example, Patent Document 2 discloses a technique for forming a wall of a log house with a small gap by inserting a substantially cylindrical insert member into a notch portion. However, according to this technique, there is a problem that a large number of parts such as plates and inserts are required in addition to logs.

  The present invention does not require any parts other than the log, and a large contact surface between the upper notch member and the lower notch member of the intersecting log is firmly fitted to the intersecting log, and also in the connecting portion. It is an object of the present invention to provide a log with sufficient strength and a log house wall structure using the log.

  An object of the present invention is a log having notch members at both ends, the notch member having an upper notch member having an upward groove, a lower notch member having a downward groove, an upper notch member and a lower notch The upper notch member has a convex portion extending in the longitudinal direction at the center thereof, and the groove portion of the lower notch member is at least aligned with the convex portion in the longitudinal direction. Achieved by a log characterized by having a length.

  According to the present embodiment, the convex portion of the upper notch member of the log disposed on the lower side and the groove portion of the lower notch member of the other log disposed so as to intersect with the upper side are fitted together. As a result, a larger contact surface can be secured. In addition, by forming the convex portion on the upper notch member, it is possible to sufficiently take up the volume of the connecting portion between the upper notch member and the lower notch member, and as a result, the strength of the connecting portion can be increased. Become.

  In a preferred embodiment, a flat upper surface of the upper notch member forms a first contact surface, both side surfaces form a second contact surface, and grooves on both sides of the convex portion are third contact surfaces. And two wall surfaces perpendicular to the longitudinal direction of the first notch member form a fourth contact surface, and the upper surface of the groove portion of the lower notch member is arranged to intersect the lower side. The other notch of the upper notch member of the log is in contact with the first contact surface, and the two wall surfaces perpendicular to the longitudinal direction of the groove portion are in contact with the second contact surface, respectively. Log surfaces extending from both ends in the direction are in contact with the third contact surface, and surfaces of the connecting portions of the lower notch member are in contact with the fourth contact surface.

  In a more preferred embodiment, the lower notch member is a concave portion extending in the longitudinal direction at a central portion thereof, and the length in the longitudinal direction is perpendicular to the longitudinal direction of the convex portion of the upper notch member. A recess that is equal to the length of. According to this embodiment, the convex part of the upper notch member of the log arranged on the lower side and the concave part of the lower notch member of the other log arranged so as to intersect with the upper side are fitted. Furthermore, the surface of the step part provided in the both sides of the recessed part of the lower notch member, and the surface of the groove part provided in the both sides of the convex part of the upper notch member contact. Furthermore, the vertical surfaces on both sides of the stepped portion come into contact with the surfaces near the upper notch member in the connecting portion. As a result, the log placed on the upper side partially covers the outside of the upper notch member of the log placed on the lower side, and the upper notch member can be prevented from being exposed to the outside. Can be prevented.

  Further, in a preferred embodiment, the lower notch member is a step portion extending on both sides of the concave portion in a direction perpendicular to the longitudinal direction, and the length in the longitudinal direction of the groove portion on both sides of the convex portion. It has a step portion equal to the length in the vertical direction in the longitudinal direction.

  More preferably, the side wall extending from the step portion of the lower notch member is in contact with the upper portion of the connecting portion of the log disposed so as to intersect the upper side.

  In a more preferred embodiment, a narrow portion is formed on the lower side of the connecting portion and on the lower notch member so that the length of the log in the direction perpendicular to the longitudinal direction becomes smaller. is doing. Another object of the present invention is to use the log described above, and an upper notch member of the log disposed below, and a lower notch of another log disposed above the log so as to intersect the log. It is also achieved by a log wall structure characterized by being formed by sequentially fitting members together.

  According to the present invention, no parts other than the log are required, the contact surface between the upper notch member and the lower notch member of the intersecting log is enlarged, the intersecting logs are firmly fitted, and the connecting portion In addition, it is possible to provide a log with sufficient strength and a log house wall structure using the log.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing an end portion of a log constituting a wall of a log house according to the first embodiment of the present invention. As shown in FIG. 1, the log 10 has notch members 12 formed at both ends thereof. The notch member 12 includes an upper notch member 14 formed at the upper part of the log 10 and a lower notch member 15 formed at the lower part.

  2 is a plan view of the end of the log according to the present embodiment, FIG. 3 is a front view of the end of the log, and FIG. 4 is a bottom view of the end of the log. 5 is a cross-sectional view taken along line AA in FIG. As shown in FIGS. 1 to 3 and FIG. 5, the upper notch member 14 has a groove 16 formed in a direction perpendicular to the longitudinal direction of the log 10. A convex portion 18 is formed at the center of the groove portion 16 in the longitudinal direction. A flat first contact surface 20 is formed on the top of the convex portion 18. Both side surfaces of the convex portion 18 form second contact surfaces 22 and 22. Third contact surfaces 24, 24 extending in the longitudinal direction are formed on both sides of the convex portion 18.

  In the present embodiment, the length (width) in the direction perpendicular to the longitudinal direction of the upper notch member 14 of the log 10 is “a”. Further, the width of the first contact surface 20 of the convex portion 18 in the same direction is “b”, and the width of the third contact surface 22 in the same direction is “c”. Here, “a = b + 2c”. The height of the convex portion 18 is “d”. For convenience, the distance from the upper surface of the convex portion 18 to the upper surface of the log 10 is “e”. In addition, the length here is not exact | strict, About several millimeters can be changed suitably considering the deformation | transformation of a timber. In particular, in the vertical direction, the height (here, “b”) of the convex portion 20 of the upper notch member may be slightly smaller (for example, about 3 mm) than the height of the concave portion 34.

  Further, in the upper notch member 14, vertical walls are formed at both ends in the longitudinal direction of the groove portion 16, which forms the fourth contact surfaces 26 and 26.

  Next, the lower notch member 15 will be described. As shown in FIGS. 1 and 3 to 5, the lower notch member 15 also has a groove portion 30 formed in a direction perpendicular to the longitudinal direction of the log 10. At both ends of the groove portion 30, elongated step portions 32, 32 extending in the vertical direction are formed, and a concave portion 34 is formed at the center portion. The surface of the stepped portion 32 forms a fifth contact surface. Hereinafter, the fifth contact surface is also denoted by reference numeral 32 as necessary. A flat sixth contact surface 36 is formed on the top of the recess 34, and a seventh contact surface 38 is formed on the side wall of the recess 34 in the direction perpendicular to the longitudinal direction.

  Furthermore, the side walls 40, 40 extending from the step portion 32 to the lower surface of the log 10 form an eighth contact surface. Hereinafter, the eighth contact surface is also denoted by reference numeral 40 as necessary.

  As shown in FIG. 3, a connecting portion 42 extending in the longitudinal direction is provided between the first notch member 14 and the second notch member 15. The surface of the connecting portion forms a ninth contact surface 44.

  The length of the sixth contact surface 36 of the recess 34 in the longitudinal direction is “b”, and the length of the stepped portion (fifth contact surface) 32 in the longitudinal direction is “c”. The height of the side wall (seventh contact surface) of the recess 34 is “d”, and the height of the side wall (eighth contact surface) 40 extending from the step portion 32 is “f”.

  In the present embodiment, the log width “a” is 120 mm, the log height “h” (see FIG. 3) is 180 mm, and the dimensions “b” to “f” are 100 mm, 10 mm, 40 mm, 40 mm, respectively. 40 mm and 10 mm.

  A structure in the case where the logs 10 configured in this way are assembled so as to sequentially intersect will be described. FIG. 6 is a side view showing a portion in which a plurality of logs 10 are assembled, and FIG. 7 is a perspective view thereof. As shown in FIGS. 6 and 7, in the present embodiment, the upper notch member 14 of the log 10 arranged in a certain direction, and the log 10 arranged in a direction perpendicular to the upper notch member 14 of the log 10 are arranged. By fitting the lower notch member 15, the logs are firmly fixed.

More specifically,
A first contact surface 20 of the log upper notch member 14 disposed on the lower side, and a sixth contact surface 36 of the log lower notch member 15 disposed on the house side so as to intersect the log,
A second contact surface 22 of the lower log upper notch member 14 and a seventh contact surface 38 of the upper log lower notch member 15;
A third contact surface 24 of the lower log upper notch member 14 and a fifth contact surface 32 of the upper log lower notch member 15;
A fourth contact surface 26 of the lower log upper notch member 14, a ninth contact surface 44 of the coupling portion 42 of the upper log lower notch member 15, and
The upper portion of the lower log ninth contact surface 44 and the eighth contact surface 40 of the upper log lower notch member 15.
Are almost in contact with each other.

  In particular, in the first embodiment, the eighth contact surface 40 can contact the upper portion (the ninth contact surface 44) of the log connecting portion 44 disposed on the lower side. That is, the log placed on the upper side partially covers the outside of the upper notch member 14 of the log placed on the lower side, and the upper notch member 14 can be prevented from being exposed to the outside. Thereby, it becomes possible to prevent the entry of rain or the like more reliably.

  Thus, in the first embodiment, various contact surfaces are in contact with each other. The area of the contact surface can be made larger than a normal square cut. For example, consider a case where a square cut having a corresponding size is applied to a log having the same dimensions as in the first embodiment.

  As shown in FIG. 8, in the case of the conventional square cut, the size of the contact surface in the upper notch member can be expressed by the following equation.

a ² + 2a (e + d) (1)
Since a = b + 2c, (1) can be expressed as follows.

b ² + 4bc + 4c ² + 2be + 4ce + 2bd + 4cd (2)
On the other hand, the size of the contact surface of the upper notch member 14 according to the present embodiment can be expressed by the following equation.

2ac + 2 (cd + ae) + 2ad + 2ab
= B ² + 4bc + 4c ² + 2be + 4ce + 2bd + 8cd (3)
Therefore, the contact surface of the upper notch member 14 can be increased by 4 cd compared to the conventional square cut. Moreover, not only can the contact surface be made larger, but the number of contact surfaces can be increased so that various contact surfaces come into contact with each other so that the intersecting logs can be more firmly fixed.

  In the case of the conventional square cut, the size of the contact surface in the lower notch member is as follows.

a ² + 2a (d + f)
= B ² + 4bc + 4c ² + 2bd + 2bf + 4cd + 4cf (4)
On the other hand, the size of the contact surface of the lower notch member 15 according to the present embodiment is as follows.

ab + 2a (d + c + f)
= B ² + 4bc + 4c ² + 2bd + 2bf + 4cd + 4cf (5)
Therefore, the contact surface equivalent to the conventional square cut can be secured for the lower notch member 15 according to the second embodiment.

Furthermore, according to the first embodiment, by providing the convex portion 18 in the upper notch member 14, the volume of the log cut by the upper notch member can be reduced by b ² compared to the conventional square cut. It can be reduced by d + 2bcd.

For example, as described above, the log width “a” is 120 mm, the log height “h” is 180 mm, and the dimensions “b” to “f” are 100 mm, 10 mm, 40 mm, 40 mm, 40 mm, 10 mm, respectively. And In this case, conventionally, the area of the contact surface of the upper notch member is 33600 mm ² , but according to the present embodiment, the area of the contact surface of the upper notch member 14 is 35200 mm ² .

Further, when the conventional square cut is performed, wood is cut by 120 mm × 120 mm × 80 mm = 1152000 mm ³ in order to form the upper notch member. On the other hand, according to the present embodiment, it is only necessary to cut 672,000 mm ³ of wood in order to form the upper notch member 14. In other words, the amount of wood to be cut to form the upper notch member can be 58.3%.

Similarly, when the conventional square cut is performed, it is necessary to cut wood by 120 mm × 120 mm × 50 mm = 720000 mm ³ in order to form the lower notch member. On the other hand, according to the present embodiment, it is only necessary to cut wood by 624000 mm ³ . That is, the amount of wood on which the lower notch member is to be formed can be 86.7%.

Looking at the entire portion of the notch is formed, in a conventional square-cut, for ^{notching, 1872000mmm 3 / 2592000mm 3 ≒ 72} % ones wood is cut. In contrast, according to the first embodiment, for ^notching, it suffices Kiritore a 1296000mm ³ / 2592000mm 3 = 50% of the wood. Therefore, the strength of the log in the notch member can be remarkably increased as compared with the conventional one. In particular, in the present embodiment, in the upper notch member, the convex portion 18 has a function as a log reinforcing portion in the upper notch member 14. In forming the notch, if an excessive force is applied in the vertical direction, there is a risk of breakage. However, since the protrusion 18 extends in the longitudinal direction of the log 10, the strength of the notch forming portion can be sufficiently increased. Furthermore, the convex part 18 of the log upper notch member 14 located on the lower side is fitted with the concave part 34 of the log lower notch member 15 located on the upper side.

  As described above, according to the present embodiment, the upper notch member 14 is formed with the convex portion extending in the longitudinal direction, so that it is between the lower notch member of the log arranged so as to intersect the upper side of the log. While securing the number and area of the contact surfaces, it is possible to significantly reduce the volume of the cut wood.

  A recess 34 is also formed in the lower notch member 15 of the log 10, and the recess 34 and the protrusion 18 of the upper notch member 14 of the log disposed so as to intersect with each other are fitted, and a step is formed. The 8th contact surface 40 extended to each side part of the part 32 can contact the upper part (9th contact surface 44) of the connection part 44 of the log arrange | positioned below. Accordingly, the log placed on the upper side is partially covered outside the upper notch member 14 of the log placed on the lower side, and the upper notch member 14 can be prevented from being exposed to the outside, such as rain. It is possible to prevent entry.

  Next, a second embodiment of the present invention will be described. In the first embodiment, the concave portion 34 extending perpendicularly to the longitudinal direction of the log is provided at substantially the center of the groove portion 30 of the lower notch member 15, but in the second embodiment, it extends perpendicularly to the longitudinal direction of the log. Only the groove is formed.

  FIG. 9 is a perspective view showing an end portion of a log constituting the wall of the log house according to the second embodiment. In the second embodiment, the same members as those in the first embodiment are denoted by the same reference numerals. As shown in FIG. 9, notches 112 are formed at both ends of the log 100. The notch member 112 includes an upper notch member 14 and a lower notch member 116. The upper notch member 14 is the same as that of the first embodiment.

  FIG. 10 is a plan view of the end of the log according to the second embodiment, FIG. 11 is a front view of the end of the log, and FIG. 12 is a bottom view of the end of the log. 13 is a cross-sectional view taken along line BB in FIG.

In the second embodiment, the lower notch member 116 has a groove 130. The longitudinal width of the groove 130 matches the length of the upper notch member 14 in the direction perpendicular to the longitudinal direction. Further, the vertical height (depth) of the groove portion 130 substantially coincides with the vertical height of the convex portion of the upper notch member 14. Therefore, when logs are placed crossed,
A first contact surface 20 of the upper log notch member 14 disposed on the lower side, and an upper surface 136 of the groove portion 130 of the lower notch member 115 of the upper log,
Both side surfaces (second contact surfaces) 22 of the lower log upper notch member 14, and both side surfaces 138 of the groove portion of the upper log lower notch member 115, and
A third contact surface 24 extending on both sides of the convex portion 18 of the upper notch member 14 of the lower log, and a lower end surface of the log extending vertically from the both ends of the lower notch member 14 of the upper log Part 140
Almost touch each other.

  As described above, in the second embodiment, the shape of the lower notch member is simple compared to the first embodiment, and the lower portion of the log arranged on the upper side as in the first embodiment. The notch member does not cover the log placed on the lower side. However, the cutting (cutting) of the wood for forming the lower notch member 115 can be reduced, and a larger connecting portion 42 between the upper notch member 14 and the lower notch member 115 can be secured. .

  Next, a third embodiment of the present invention will be described. The third embodiment basically has the same configuration as the notch member 12 of the first embodiment. Therefore, members similar to the upper notch member 14 and the lower notch member 15 according to the first embodiment are denoted by the same reference numerals. FIG. 14 is a perspective view showing an end portion of a log according to the third embodiment of the present invention. As shown in FIG. 14, in the third embodiment, the portion of the connecting portion 42 located above the lower notch member 15, that is, the lower portion of the connecting portion (see reference numeral 150 in FIG. 14: , Referred to as “the narrow portion 150”), compared to the first embodiment, is cut and thinned by a predetermined amount.

  15 is a plan view of an end portion of a log according to the third embodiment, FIG. 16 is a front view of the end portion of the log, FIG. 17 is a bottom view of the end portion of the log, and FIG. It is an AA sectional view taken on the line. As shown in FIGS. 15 to 18, in the third embodiment, the narrow portion 150 is cut by “k (approximately 5 mm in the third embodiment)” from both sides of the log 10. . Therefore, the length (that is, the width) perpendicular to the longitudinal direction of the log 10 of the narrow portion 150 is “a−2k”. In particular, as can be understood from FIGS. 16 and 17, the length of the narrow portion 150 in the longitudinal direction is “b + 2c + 2k”.

  Thus, by forming the narrow portion 150, in addition to the engagement with the upper notch member 12 and the lower notch member 15 according to the first embodiment, the contact surface can be further increased, and more It becomes possible to fix the logs firmly.

  According to the third embodiment, since the contact surface can be further increased, it is possible to firmly fix the logs while maintaining sufficient strength even if the log width is reduced.

  The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

  For example, in the above-described embodiment, a notch member is formed in a so-called square log, but the notch member according to the present invention is not limited to a square log but a log of another shape (for example, a round log, a D-type log). It is possible to apply to a drum grinding log).

  Needless to say, the height and width of the protrusions of the upper notch member and the height and width of the recesses of the lower notch member are not limited to those of the above embodiment.

FIG. 1 is a perspective view showing an end portion of a log constituting a wall of a log house according to the present embodiment. FIG. 2 is a plan view of the end portion of the log according to the present embodiment. FIG. 3 is a front view of the end portion of the log according to the present embodiment. FIG. 4 is a bottom view of the end portion of the log according to the present embodiment. 5 is a cross-sectional view taken along line AA in FIG. FIG. 6 is a side view showing a portion in a state where a plurality of logs according to the present embodiment are assembled. FIG. 7 is a perspective view showing a part in a state where a plurality of logs according to the present embodiment are assembled. FIG. 8 is a perspective view showing a notch member of a conventional square cut log. FIG. 9 is a perspective view showing an end portion of a log constituting the wall of the log house according to the second embodiment. FIG. 10 is a plan view of an end portion of a log according to the second embodiment. FIG. 11 is a front view of an end portion of a log according to the second embodiment. FIG. 12 is a bottom view of the end portion of the log according to the second embodiment. 13 is a cross-sectional view taken along line BB in FIG. FIG. 14 is a perspective view showing an end portion of a log constituting a wall of a log house according to the third embodiment. FIG. 15 is a plan view of an end portion of a log according to the third embodiment. FIG. 16 is a front view of an end portion of a log according to the third embodiment. FIG. 17 is a bottom view of the end portion of the log according to the third embodiment. 18 is a cross-sectional view taken along line AA in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Log 12 Notch member 14 Upper notch member 15 Lower notch member 16 Groove part 18 Convex part 30 Groove part 32 Step part 34 Concave part 42 Connection part

Claims (3)

A log with notch members at both ends,
The longitudinal direction of the log is the log longitudinal direction, the longitudinal direction of the log and the direction perpendicular to the vertical direction is the log width direction,
The notch member comprises an upper notch member having an upward groove, a lower notch member having a downward groove, and a connecting portion between the upper notch member and the lower notch member,
The upper notch member has a convex portion extending in the log longitudinal direction at the center thereof,
The groove portion of the lower notch member is a concave portion extending in the log width direction at the center thereof, and the length in the log longitudinal direction is equal to the length in the log width direction of the convex portion of the upper notch member, Having a recess whose depth is equal to the height of the protrusion of the upper notch member;
The log longitudinal direction length of the groove portion of the upper notch member is smaller than the log width direction length of the log,
The range in which the length in the log longitudinal direction is equal to the length in the log width direction of the log, including the lower part of the upper notch member, below the upper notch member of the log is the length in the log width direction. Is formed as a narrow portion that is smaller than the length of the log in the log width direction,
The said connection part and the said lower notch member are formed in the said narrow part, The log characterized by the above-mentioned. The groove portion of the lower notch member is a step portion extending on both sides of the concave portion in the log width direction, and the length in the log longitudinal direction is the length of the groove portion on both sides of the convex portion in the log width direction. The log according to claim 1, wherein the log has a step equal to each other. Using the log according to any one of claims 1 to 2, an upper notch member of a log disposed below and another log disposed above the log so as to intersect with the log. A log wall structure formed by sequentially fitting a lower notch member.

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