JP4857971B2 - Construction materials - Google Patents

Description

  The present invention relates to a structural material for building, and more particularly, to a structural material for building made of a laminated material of different grades in which a plurality of types of saw plates having different grades are laminated.

  In recent years, laminated timber has been widely used in buildings with a wooden structure from the viewpoint of effective utilization of natural forest resources and homogenization of member quality. Glulam is mainly divided into structural glulams used for load-bearing parts such as pillars, beams and girders in buildings, and construction glulams used for non-strength parts such as internal structures. About a laminated material, the structure, intensity | strength grade standard, etc. are prescribed | regulated by JAS (nonpatent literature 1).

  In the above JAS, detailed quality standards are also defined for a laminated material having a different grade structure in which a high grade and a low grade are joined together. In such a laminated material with different grades, a low-strength graded steel plate is placed in the inner layer, and the laminated plates are laminated in order from the middle layer to the outer layer and the outermost layer so that the strength grade becomes higher, and symmetrical in the vertical direction. In general, the cross-sectional configuration is a simple one. In recent years, for example, a board made of relatively inexpensive lower tree species such as cedar and cedar is placed in the inner layer, and a board made of higher tree species such as bay pine and dafrika larch is placed in the outermost layer. Laminated wood with a tree species composition has also been proposed.

By the way, in a hut set of wooden buildings, diagonal materials such as rafters, corner trees, and valley trees are often joined to horizontal members such as purlins, eaves girders and purlins. In such a joining portion, a space in which the upper surface of the horizontal member is cut obliquely in accordance with the gradient of the diagonal member and the diagonal member is fitted into the inclined surface is often used. Moreover, in order to avoid the trouble of notch processing and the cross-sectional defect | deletion of the horizontal member by a notch, for example, as shown to patent document 1, the cross-sectional triangle base plate matched with the gradient of the diagonal material on the upper surface of a horizontal member There is also a proposal for attaching a slanted material on it.
“Japanese Agricultural Standard for Structural Glue” January 29, 1996 Ministry of Agriculture, Forestry and Fisheries Notice No. 111 JP-A-11-1988

  In the case of a wooden building hut as described above, when trying to use a laminated material with a different symmetric structure for horizontal members such as eaves girders and purlins, a notch for joining diagonal members to the horizontal member Forming the outermost layer having the highest strength, the cross-sectional performance of the laminated material is impaired. Moreover, also when attaching a base plate etc. of a cross-sectional triangle shape to the upper surface of a horizontal member, the installation takes time and workability falls.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a structural material for building made of laminated material that can be suitably used particularly for a joining portion with a diagonal member in a hut frame structure and that is advantageous in terms of strength.

  The building structural material according to the present invention includes other members on the outermost layer on at least one side of the symmetrically different grade components laminated so that the grade of the ground plate increases stepwise from the inner layer to the intermediate layer, the outer layer, and the outermost layer. It is made of a laminated material in which processed layers that can be cut out according to the joining form are laminated and bonded.

  “Can be cut out according to the joining form with other members” means a portion that does not need to be included in the material for ensuring the required cross-sectional performance. Therefore, the processed layer may be a saw plate of the same grade as that of the outermost layer of the symmetrically different grade constituent part, or may be constituted by a higher graded plate than the outermost layer. By using a low-grade board for the processed layer, it is possible to effectively use inexpensive tree species such as domestic cedar.

  Furthermore, the structural material for building of the present invention is characterized in that a cutout for fitting and joining another member to the processed layer is formed.

  Moreover, the structural material for building of the present invention is characterized in that the cross section of the processed layer is cut into a substantially triangular shape, a substantially trapezoidal shape, or a substantially pentagonal shape over substantially the entire length of the material.

  Since the structural material for building of the present invention configured as described above is composed of a laminated material obtained by additionally laminating and bonding a processing layer to the outermost layer of a symmetrical different grade component, the required cross-sectional performance is obtained. It is secured by the symmetric different grade component, and the processed layer can be handled as a part not included in the material. Since this processed layer is a part that can be freely cut or cut according to the joining form with other members, it is possible to reduce the member cost by using a low-priced low priced plate here. Can do.

  Such a building structural material is laminated and bonded integrally to the processing layer in the manufacturing process of the laminated material, and if the pre-cut processing at the factory is applied to the processing layer as necessary, other members are joined at the construction site. The workability at the time is also greatly improved. In particular, when it is used as a horizontal member for a hut assembly, it is easy to join rafters, roof panels, etc. by arranging a processing layer on the upper surface and applying an oblique process that matches the gradient of the hut assembly. Strengthens and contributes greatly to increasing the rigidity of the entire cabin.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a cross-sectional configuration of a building structural material 10 according to a first embodiment of the present invention. The symmetrical different grade component 2 of this structural material for building 10 has a configuration in which a grade L90, a grade L110, and a grade 140 L140 are laminated in a total of five layers in order from the neutral axis side. It has become. Then, two layers of L90 grades are additionally laminated on the upper side of L140, which is the outermost layer, so that these two layers are processed layers 3.

Here, the grade of the board represented by “L” is a JAS quality evaluation value determined according to the bending Young's modulus of the board measured by the grade classifier, and has 12 levels from L50 to L200. The larger the numerical value, the higher the bending strength of the ground plate. As for the laminated material of the symmetric different grade configuration, the strength grade of the laminated laminated whole as a whole is determined by the grade of the outermost layer of the board. Since the cross-sectional performance is ensured by the L140 plate arranged in the outermost layer, the two layers of the processed layer 3 can be regarded as an additional portion not included in the material, and the freedom to this processed layer 3 Processing becomes possible.

  In the above-mentioned JAS, for each layer of the laminated material, the inner layer is a part that is 1/4 or more away from both outer sides in the stacking direction, the intermediate layer is a part that is 1/8 or more away from both outer sides and within 1/4, The outer layer is defined as a portion 1/16 or more away from both outer sides and within 1/8, and the outermost layer is defined as a portion within 1/16 from both outer sides (see FIG. 4). However, since the number of laminated sheets and thickness, the cross-sectional dimensions of the whole material, etc. are various, in the present invention, the classification of inner layer, intermediate layer, outer layer, outermost layer is a guideline indicating a relative positional relationship. The positioning, the presence or absence of the intermediate layer and the outer layer, the number of layers, and the thickness of each layer are not strictly specified.

  Further, the processed layer 3 is not limited to two layers, and may be a laminate of one or three or more layers. When the processing layer 3 has two or more layers, the grades of the strips constituting the processing layer 3 may be a combination of different grades.

  Further, in the present invention, the ground plate constituting each layer may be any one made of one ground material, or two or more ground materials bonded together by a width strip or a longitudinal joint.

  FIG. 2 shows a building structural material 11 according to a second embodiment of the present invention. This building structural material 11 is obtained by pre-cutting an oblique notch 4 for joining a diagonal material 5 such as a rafter to the processed layer 3 in the building structural material 10 shown in FIG. If such a structural material 11 for building is used, the trouble of notching at the construction site can be eliminated, and there is no fear of a decrease in strength due to a cross-sectional defect of the notch 4.

  In addition, the shape of the notch 4 can be arbitrarily set within the thickness range of the processed layer 3 according to the fit with the mating member to be joined. Of course, a groove-shaped notch parallel to the laminated surface is also possible. Moreover, depending on the use site | part of the structural material 11 for construction, the process layer 3 may be arrange | positioned under the symmetrical different grade structure part 2. FIG. For example, it is used when it is used as a beam of a building frame and a notch for joining a lower-level floor column or brace is provided on the lower side thereof. Furthermore, it is also possible to provide the processing layer 3 on both the upper and lower sides of the symmetrical different grade component 2. Moreover, this structural material for construction can be used as an upright material such as a pillar, not as a horizontal member.

  FIG. 3 shows a building structural material 12 according to a third embodiment of the present invention. The symmetrical different grade component 2 of this structural material for building 12 has a total of 9 layers of a grade L90, L110, L125, and L140 grades in order from the neutral axis side. It is the structure laminated | stacked on. Then, two layers of L90 grades are additionally laminated on the upper side of the outermost L140 plate to form a processed layer 3, and this processed layer 3 is aligned along the diagonal line in the cross section. Thus, the entire length of the material is cut into a triangular shape. If such a structural material 12 for construction is used as a girder of a hut, for example, the trouble of attaching a floor plate to the upper surface at the construction site becomes unnecessary. In addition, since the integrity of the processed layer 3 that supports the rafters and the roof panel and the symmetrical different grade component 2 that ensures the cross-sectional performance of the member is high, the rafters and the roof panel, etc. The joining strength when joining with a nail or a screw is also high, and the rigidity of the entire cabin can be increased.

  As an example of the cross-sectional shape in which a part of the processed layer 3 is cut out, not only the triangular shape as shown in the figure, but also a trapezoidal shape in which corners are cut obliquely leaving a part of the uppermost surface, and a part of the side face are also left. It is also possible to use a pentagonal shape, a triangular shape with a slope on both sides, or a triangular shape.

It is sectional drawing of the structural material for construction which concerns on the 1st Example of this invention. It is a perspective view of the structural material for construction which concerns on the 2nd Example of this invention. It is sectional drawing of the structural material for construction which concerns on the 3rd Example of this invention. It is a reference sectional view showing the layered composition of the laminated material specified in JAS.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Structural material 11 Architectural structural material 12 Architectural structural material 2 Symmetrical different grade composition part 3 Processed layer 4 Notch

Claims (3)

Notches are formed on the outermost layer on at least one side of the symmetrically graded components that are laminated so that the grades of the strips increase in stages from the inner layer to the intermediate layer, outer layer, and outermost layer, depending on the type of connection with other members. Ri Do from possible working layers are laminated and adhered glulam,
A building structural material , wherein a cutout for fitting and joining another member to the processed layer is formed . Notches are formed on the outermost layer on at least one side of the symmetrically graded components that are laminated so that the grades of the strips increase in stages from the inner layer to the intermediate layer, outer layer, and outermost layer, depending on the type of connection with other members. It consists of a laminated material with possible processed layers laminated and bonded,
A structural material for building , wherein a cross-section of the processed layer is cut into a substantially triangular shape, a substantially trapezoidal shape, or a substantially pentagonal shape over substantially the entire length of the material. The structural material for building according to claim 1 or 2,
The structural material for building according to claim 1, wherein the processed layer is formed of a lower plate than the outermost layer of the symmetrically different grade component .

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