JP2024020098A - Log material and inspection method of log wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a log material that does not affect structural strength of a log house even if its side face portion sustains natural deterioration and can be repaired as necessary, and an inspection method of a log wall using the log material.

SOLUTION: The present invention relates to a log material that is provided with a core material formed by vertically laminating plural pieces of long plate-like laminas and ligneous design materials put on side faces along at least one longer direction of the core material.

SELECTED DRAWING: Figure 6

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to log materials used in log houses and a method for inspecting log walls of log houses.

The outer surface of the log materials used in log houses is exposed to the external environment and may suffer natural deterioration due to the effects of wind and rain, sunlight, or living organisms (e.g. rotting fungi, termites, etc.). may affect the structural elements of the

Patent Document 1 below describes a wooden core formed to be able to support the load of a building, a fireproof layer disposed along the outer periphery of the wooden core, and a layer provided on the outside that prevents combustion in the event of a fire. A wood pole is disclosed that has a burnt layer that forms a char layer.

Patent Document 2 below discloses a log house lumber in which a horizontally laminated inner lumber is arranged between a pair of outer lumber.

JP2021-095768A Japanese Patent Application Publication No. 2021-050601

FY2016 Forestry Agency commissioned project (supplementary budget) Commissioned project to promote the spread of CLT buildings, etc. Research report on technical studies, etc. related to the standardization of new wood components (http://www.loghouse.jpn.com/pdf/H28rinya% 201-4.pdf) July 2017 Japan Log House Association

In the technology disclosed in Patent Document 2, when attempting to increase the thickness of the wall due to design requirements, it is necessary to increase the thickness of each of the horizontally laminated inner timbers or increase the number of them, or at least either one of them must be done. There is. At that time, it may be difficult to maintain uniformity on the left and right sides of the wood. Here, on page 26 of Non-Patent Document 1, it is stated that ``The composition of the quality of the lamina of the bonded laminated material composed of the same wood species shall be as follows. (1) The quality of the lamina with respect to the central axis in the width direction. The composition of the lamina and the thickness of the lamina should be symmetrical.'' If the inside wood is horizontally laminated, in order to meet the requirements described in this document, it is necessary to consider the symmetry of the lamina that makes up the inside wood, which can be difficult, especially when trying to increase the number of lamina. It is expected that this will happen.

Therefore, the embodiments of the present disclosure provide logs that can be repaired as necessary, while easily ensuring left-right homogeneity of the inner part, without affecting the structural strength of the log house even if the side parts suffer natural deterioration. An object of the present invention is to provide a method for inspecting a log wall using the log material.

The log material according to the first embodiment of the present disclosure includes a core material formed by vertically stacking a plurality of elongated plate-shaped lamina, and a core material attached to at least one side surface along the longitudinal direction of the core material. It is equipped with a wooden design material. It is desirable that the decorative material is formed of a sawn board. Here, "vertically laminated" means that horizontal lamina are laminated in the vertical direction. In contrast, "horizontal lamination" means that vertical lamina are laminated in the horizontal direction.

A second embodiment of the present disclosure is a log wall in which the log materials of the first embodiment are laminated, wherein the core material constitutes a structural frame of the log wall, and the design material constitutes the structure of the log wall. A method for inspecting a damaged log wall, the method comprising: an inspection step of inspecting the state of deterioration of the wall surface of the log wall; and a repair step of repairing the design material according to the state of deterioration. .

In the second embodiment, the inspection step includes a specifying step of identifying a deteriorated portion of the log wall, and a determining step of determining whether the depth of the deteriorated portion remains within the design material. and the repair step includes a removal step of removing a removal range including the deteriorated portion when it is determined in the determination step that the depth of the deteriorated portion remains within the design material; It is preferable that the method includes a forming step of forming a suitable repair member, and an inlaying step of fitting and fixing the repair member in the area where the removal range has been removed. Further, it is more preferable that the identifying step is carried out by at least one of visual inspection and percussion, and that the determining step is carried out using an insertion resistance measuring device.

Since the embodiments of the present disclosure are configured as described above, the structural strength of the log house is not affected even if the side portions undergo natural deterioration, and the log material can be repaired as necessary, and the log It becomes possible to provide a method for inspecting log walls using wood.

A front view of the edge side of the core material is shown. The core material of FIG. 1 is shown in a perspective view. The front view shows the edge side of the core material to which the design material is attached. The core material of FIG. 3 is shown in a perspective view. A front view of the edge of the log material. The log material of FIG. 5 is shown in a perspective view. A front view of a log wall constructed from stacked log materials is shown. 8 shows the log wall of FIG. 7 in a perspective view; FIG. A front view of the edge side of another form of log material is shown. The log material of FIG. 9 is shown in a perspective view. It is a flow chart showing an outline of a log wall inspection method. It is a flow chart showing an outline of an inspection process in a log wall inspection method. It is a flow chart showing an outline of a repair process in a log wall inspection method. FIG. 2 is a cross-sectional view schematically showing an example of a log wall subjected to a repair process. FIG. 15 is a cross-sectional view schematically showing an outline of the removal process in the log wall of FIG. 14; FIG. 15 is a cross-sectional view schematically showing an outline of the formation process of the log wall in FIG. 14; FIG. 15 is a cross-sectional view schematically showing an outline of the inlay process on the log wall of FIG. 14.

Embodiments of the present disclosure will be described with reference to the drawings. The core materials, log materials, and log walls shown in the drawings referred to below are schematic representations, and the dimensions, arrangement, and proportions of each part shown therein reflect the actual ones. It doesn't necessarily mean that you are doing it. Further, the reference numerals commonly used in each figure indicate common members or parts even if they are not mentioned in the explanation of each figure.

(1) Log material FIG. 1 is a front view showing the edge surface 22 of the core material 20 used in the log material 10 (FIG. 5) of this embodiment, and FIG. 2 is a perspective view thereof. The core material 20 is formed by vertically stacking a plurality of long plate-shaped lamina 21. The lamina 21 are usually bonded together using an adhesive. As shown in FIG. 2, the side surface 23 of the core material 20 has a striped shape of vertically laminated lamina 21. A convex portion 11 and a concave portion 12 (see FIGS. 5 and 6), which will be described later, are formed on the top surface 24 and bottom surface 25 of the core material 20.

FIG. 3 is a front view showing the edge surface 22 of the core material 20 with the decorative material 30 attached to the side surface 23, and FIG. 4 is a perspective view thereof. The decorative material 30 is a flat plate made of a wooden material, preferably a sawn board, and is attached to at least one, preferably both, of the longitudinal sides 23 of the core material 20. The design material 30 is usually bonded to the side surface 23 of the core material 20 with an adhesive.

FIG. 5 shows a front view of the edge surface 22 of the log material 10 of this embodiment, and FIG. 6 is a perspective view thereof. The core material 20 shown in FIGS. 3 and 4 to which the design material 30 is attached is cut so that the cross-sectional shape becomes the edge surface 22 of FIG. The material becomes 10. That is, the top surface 24 of the core material 20 and the upper edge of the decorative material 30 that is flush with the top surface 24 are cut so that the center portion protrudes upward, so that the convex portion 11 is a protrusion along the longitudinal direction. is formed. On the other hand, the bottom surface 25 of the core material 20 and the lower edge of the decorative material 30 that is flush with the bottom surface 25 are cut so that the center portion is recessed upward, so that the recess 12, which is a groove along the longitudinal direction, is formed. It is formed. As shown in FIG. 5, the convex portion 11 and the concave portion 12 have substantially the same cross-sectional shape.

FIG. 7 shows a front view of a log wall 40 made of stacked log materials 10, and FIG. 8 is a perspective view thereof. As described above, the convex portions 11 and the concave portions 12 have approximately the same cross-sectional shape, so when the log materials 10 are stacked vertically, the convex portions 11 of the log materials 10 located on the lower side are stacked on the upper side. It fits into the recess 12 of the log material 10 located at. In this way, the log wall 40 is formed by stacking the plurality of log materials 10. Note that, in reality, the log materials 10 are vertically fastened together using dowels, through bolts, or the like (not shown).

FIG. 9 shows a front view of the edge face 22 of another form of log material 10, and FIG. 10 is a perspective view thereof. As shown in these figures, the log material 10 can be formed to have any width depending on design requirements. This alternative form of log material 10 can also be stacked vertically to form a log wall 40, as shown in FIGS. 7 and 8.

Here, since the core material 20 is composed of a plurality of lamina 21, even if the strength of each lamina 21 is relatively low or the strength of each lamina 21 is not necessarily uniform, these There is no problem as long as the required strength is ensured for the entire core material 20 in which the core material 20 is vertically laminated.

Further, since the log material 10 is visible from the outside, the vertically laminated lamina 21 appears in stripes on the side surface 23 of the core material 20 as described above, which may not be aesthetically pleasing. Therefore, by attaching the decorative material 30 to the side surface 23, the aesthetic appearance of the log material is improved.

Further, while the core material 20 of the log material 10 constitutes the structural frame of the log wall 40, the design material 30 is not considered in the structural calculation. Therefore, when the log material 10 suffers from natural deterioration, the structural strength of the log wall 40 is not affected at all as long as the deteriorated portion remains within the design material 30 as a damage margin.

(2) Log wall inspection method FIG. 11 is a flowchart showing an overview of the log wall inspection method of this embodiment. The log wall 40 made of the log material 10 of this embodiment can be inspected using an inspection method including an inspection step S100 for inspecting the deterioration state of the wall surface and a repair step S200 for repairing the decorative material 30 according to the deterioration state. will be inspected. Here, the state of deterioration of the wall surface refers to the state of damage or decay on the surface.

FIG. 12 is a flowchart showing an overview of the inspection process in the log wall 40 inspection method. In the inspection step S100, first, it is determined whether the deterioration location 31 of the log wall 40 is identified in the identification step of S110. This identifying step is performed by at least one of visual inspection and percussion. For example, as shown in the cross-sectional view of FIG. 14, if there is a deteriorated part 31 in the decorative material 30 attached to the side surface of the core material 20 formed of a plurality of laminas 21, the process proceeds to the determination step S120. . On the other hand, if the deteriorated portion 31 is not identified in the log wall 40, the method for inspecting the log wall 40 of this embodiment ends.

In the determination step S120, it is determined whether the depth of the deteriorated location 31 remains within the design material 30 or not. This determination step S120 can be carried out using, for example, a penetration resistance measuring device (for example, a resist graph) that punctures the deteriorated portion 31 and measures the resistance at that time. As shown in FIG. 14, if the deteriorated portion 31 remains within the design material 30, the process proceeds to the repair process of S200. On the other hand, if the deteriorated area 31 does not remain within the design material 30 but extends to the core material 20, which is the structural frame, the process proceeds to step S300, where it is considered whether separate repairs are required. .

FIG. 13 is a flowchart outlining the repair process in the log wall 40 inspection method. As shown in the cross-sectional view of FIG. 14, if the depth of the deteriorated area 31 remains within the design material 30, the removing range 32 including the deteriorated area 31 will be removed from the design material as shown in FIG. Removed from 30.

Next, in a forming step S220, a repair member 33 having a shape that matches the removal range 32 (see FIG. 15) as shown in FIG. 16 is formed. The repair member 33 is desirably made of wood of the same species as the design material 30, but may also be made of wood resin, putty, or the like.

Then, in the inlaying step of S230, as shown in FIG. 17, the repair member 33 is fitted and fixed at the location where the removal range 32 (see FIG. 15) has been removed, and the repair step is completed. With this, the method for inspecting the log wall 40 of this embodiment ends.

(3) Effects of the Embodiment As described above, in the log material 10 of the present embodiment, the deterioration of the wall surface that inevitably occurs due to the use of wood, which is a natural material, occurs in the design material 30, which is assumed as a damage allowance in advance. The structural frame of the log wall 40 can be constructed by incorporating this fact. That is, as long as the deteriorated portion 31 remains within the decorative material 30, the structural strength of the log wall 40 is not affected.

Furthermore, since the core material 20 can be formed by laminating the lamina 21, the entire log material 10 can be constructed as a laminated material. For example, when constructing a log house in a cold region, the walls of the log house do not use heat insulating material, so it is necessary to increase the wall thickness to improve the heat insulation performance. In such a case, according to the log material 10 of the present embodiment, in which the core material 20 can be formed by vertically stacking the lamina 21, it is possible to easily create a log material with a large cross section compared to a log material made of solid wood. and can be obtained at low cost. Thereby, it is possible to easily improve the insulation performance of the log house by increasing the cross section of the log material 10. Furthermore, by covering the laminated surface with the decorative material 30, an aesthetic appearance can be ensured.

Further, by the method of inspecting the log wall 40 of this embodiment, it is possible to identify and repair the deteriorated portion 31 that has occurred in the design material 30, so it is possible to maintain the log wall 40 for a long period of time. .

10 Log material 11 Convex portion 12 Concave portion 20 Core material 21 Lamina 22 Edge surface 23 Side surface 24 Top surface 25 Bottom surface 30 Design material 31 Deterioration area 32 Removal range 33 Repair member 40 Log wall

Claims (5)

A core material formed by vertically stacking a plurality of long plate-shaped lamina;
a wooden design material attached to a longitudinal side of at least one of the core materials;
Log material with. The log material according to claim 1, wherein the decorative material is formed of a sawn board. A log wall in which the log materials according to claim 1 or 2 are laminated, wherein the core material constitutes a structural frame of the log wall, and the design material serves as a damage allowance for the log wall. A method for inspecting a log wall,
an inspection step of inspecting the state of deterioration of the wall surface of the log wall;
a repair step of repairing the design material according to the state of deterioration;
How to inspect a log wall, including: The inspection process includes:
an identification step of identifying a deteriorated location of the log wall;
a determination step of determining whether the depth of the deteriorated location remains within the design material;
has
The repair process includes:
a removal step of removing a removal range including the deteriorated portion when it is determined in the determination step that the depth of the deteriorated portion remains within the design material;
a forming step of forming a repair member that fits the removal range;
an inlaying step of fitting and fixing the repair member to the location where the removal range has been removed;
The log wall inspection method according to claim 3, comprising: The identifying step is performed by at least one of visual inspection and percussion,
The log wall inspection method according to claim 4, wherein the determining step is performed using an intrusion resistance measuring device.