JP2010285853A - Exterior wall structure, and exterior wall construction method for conventional wooden house - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new exterior wall structure of conventional wooden houses made by combination of braces with an exterior wall surface material, and an exterior wall construction method. <P>SOLUTION: This exterior wall structure 10 for conventional wooden houses equipped with braces 4A/4B is designed so that furring strips 6 are orthogonally-fastened to be installed in building frames, namely, columns 2A, 2B, and 2C (column material (also including puncheon 3A)) outside room of the braces 4A/4B, while exterior wall surface materials 7A/7B composing the external face are orthogonally-fastened to be installed in the furring strips 6 (that is, longitudinal direction of the exterior wall surface materials 7A/7B orthogonally-intersects with longitudinal direction of the furring strip 6), outside room of the furring strips 6. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an outer wall structure for forming an outer wall of a building and an outer wall construction method.

  Conventionally, a technique for improving the earthquake resistance of a building by using an outer wall surface material such as ceramic siding is known (see Patent Document 1).

  In traditional wooden houses, braces are used to ensure seismic performance. This structure using the braces is found in a wet wall method that employs a wet wall form such as a mortar wall.

JP 2008-231765 A

  According to Patent Document 1, it is disclosed that the outer wall material contributes to the improvement of the seismic performance (wall strength magnification), but the dry wall construction method using the outer wall material is adopted in the place where the braces exist. In the past, no investigation has been made as to what kind of effect can be obtained.

  In addition, bracing has been often used as a load-bearing wall, but it is known that it breaks by buckling out of plane by itself, but how much buckling is suppressed by the outer exterior material. It has not been examined whether it can be expected.

  Mortars and siding materials are often used as general exterior materials. However, due to past earthquake damage and experimental results, mortar drops off at braces, cracks in siding materials, nails, etc. It is known that the effect of suppressing buckling of braces cannot be exhibited with general exterior materials.

  Therefore, in view of the above problems, the present invention arranges a columnar edge (horizontal trunk edge) at regular intervals in the direction perpendicular to the columns and the studs on the outside of the bracing, and firmly fixes them with nails or screws, and further to the outside of the trunk Place the outer wall material in the direction perpendicular to the edge and fix it firmly with screws. Thereby, as a two-layer structure that goes straight, the out-of-plane rigidity is increased, the buckling of the brace to the out-of-plane is suppressed, and the proof stress performance higher than the added value of the proof strength performance of the brace or the exterior material can be exhibited. This paper proposes the outer wall structure of a new conventional wooden house and the outer wall construction method.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, as described in claim 1,
On the outside of the bracing room, the torso is fixed to the pillar, which is the building frame, in the direct direction.
An outer wall structure of a conventional wooden house, wherein an outer wall surface material constituting an exterior surface is disposed in a direction orthogonal to the trunk edge on the outdoor side of the trunk edge.

Moreover, as described in claim 2,
Providing a bracing between the beam and the column;
A step of providing a torso that is fastened to the building frame on the outside of the bracing;
The outer wall construction method of a conventional wooden house is configured to include a step of fixing an outer wall surface material constituting an exterior surface to the outer edge of the trunk edge, while being fixed to the trunk edge.

  As effects of the present invention, the following effects can be obtained.

  That is, in the first aspect of the invention, an outer wall structure that exhibits high seismic performance (wall strength magnification) can be realized by a combination of the bracing, the trunk edge, and the outer wall surface material. Moreover, in the case of refurbishment, by using the existing bracing, high seismic performance (wall strength magnification) can be obtained while effectively using the existing bracing.

  In the invention according to claim 2, an outer wall structure that exhibits high seismic performance (wall strength magnification) can be realized by a combination of the brace, the trunk edge, and the outer wall surface material.

The figure which showed the whole structure of the outer wall structure which concerns on one Example of this invention. The figure shown about the outline | summary of the specification of a test body.

FIG. 1 is a diagram showing an outer wall structure 10 of a conventional wooden house according to an embodiment of the present invention.
As shown in FIG. 1, the beam members 1A and 1B are horizontally arranged at the upper and lower sides, and columns 2A, 2B, and 2C are arranged in the vertical direction between the beam members 1A and 1B. Further, between the pillars 2A and 2B, an inter-column 3A is disposed in the vertical direction, and between the pillars 2B and 2C, the inter-column 3B is disposed in the vertical direction. When the configuration shown in FIG. 1 is arranged on the first floor of the building, the beam member 1B functions as a base, and the term “beam member” includes the base.

  Further, as shown in FIG. 1, the bracing 4A is arranged in an oblique direction from the lower part of the pillar 2A to the upper part of the pillar 2B. Similarly, the bracing 4B is arranged in an oblique direction from the lower part of the pillar 2C to the upper part of the pillar 2B. Established.

  In addition, as shown in FIG. 1, moisture permeability is applied so that these members are covered outside the beam members 1A and 1B, the pillars 2A, 2B, and 2C, the inter-columns 3A and 3B, and the braces 4A and 4B. The waterproof sheet 5 is stretched. And the outer periphery of this moisture permeable waterproof sheet 5 is provided with trunk edges 6, 6,..., And these trunk edges 6, 6,... Are connected to the pillars 2A, 2B, 2C, the intermediate pillars 3A, 3B, etc. Can be stopped.

  Further, as shown in FIG. 1, outer wall surface materials 7A and 7B are disposed on the outdoor side of the trunk edges 6, 6,. This outer wall surface material is fastened to the trunk edges 6, 6,. As the outer wall surface material, face materials such as ceramic siding, ceramic siding, metal siding, and ALC plate can be applied.

  As described above, in the configuration of FIG. 1, the outer wall structure 10 of the conventional wooden house provided with the braces 4A and 4B, the trunk edges 6 and 6... Are formed outside the braces 4A and 4B. It is arranged to be fixed to the pillars 2A, 2B, and 2C (column members (including the intermediary pillar 3A)) that are the casings, and is arranged on the outside of the trunk edges 6, 6,. The wall surface materials 7A and 7B are arranged so as to be fixed in the direction orthogonal to the trunk edges 6, 6... (The longitudinal direction of the outer wall surface materials 7A and 7B and the longitudinal direction of the trunk edge 6 are Orthogonally).

  Moreover, as shown in FIG. 1, it is the exterior wall construction method of a conventional wooden house, and the process of providing braces 4A and 4B between the beams 1A and 1B and the pillars 2A, 2B, and 2C, and the chambers of the braces 4A and 4B Steps for providing the outer rims 6, 6, and the like that are fastened to the pillars 2 A, 2 B, 2 C as the building frame, and the exterior of the outer rims of the rims 6, 6. And a step of fixing the wall surface materials 7A, 7B to the trunk edges 6, 6...

  With the above configuration, as shown in FIG. 1, an outer wall that exhibits high seismic performance (wall strength magnification) by a combination of bracing 4A, 4B, torso edges 6, 6,..., And outer wall materials 7A, 7B. Structure 10 can be realized. Further, the two-layer structure includes the pillar 2A and the pillar 3A, which are pillar materials, a first layer in which the trunk edge 6 is orthogonal, and a second layer in which the trunk edge 6 and the outer wall surface materials 7A and 7B are orthogonal. Is formed. Accordingly, the out-of-plane rigidity can be increased, the buckling of the braces to the out-of-plane can be suppressed, and the proof stress performance higher than the added value of the proof stress performance of the brace or the exterior material can be exhibited.

<Examples and comparative examples>
Next, the effect of the configuration of the present invention will be described using an example to which the configuration of the present invention is applied and a comparative example. The main conditions are as follows.

(1) Specifications Tests were performed on the specifications of the examples and comparative examples. The main specifications are described below. The outline of the specification is shown in FIG.
-Upper beam 21: Cross section 105mm x 180mm, length 2730mm tree species Yonematsu (common specification)
・ Lower beam 22: Cross section 105mm x 105mm, length 2730mm too tree species (common specification)
・ Space between upper beam and lower beam: 2594mm (common specification)
-Pillar 23: Cross section 105mm x 105mm, length 2594mm too tree species (common specification)
・ Spring 24: Cross section 27mm x 105mm, length 2594mm too tree species (common specification)
-455mm spacing between pillars and studs (common specification)
-Bracing 25: Cross section 90mm x 90mm (common specification)
-Trunk edge 26: 15mm x 50mm softwood structure plywood (common specification)
・ Body edge spacing: 303mm (common specification)
・ Fastening of torso: CN65 nail: 303 mm pitch ・ Outer wall material 27: Ceramic siding: Thickness 18 mm × Width 455 mm × Length 2730 mm (JISA5422 product)
・ Fastening of outer wall material: Stainless steel screw: φ5.0mm with truss head L = 50mm: 150mm pitch in the horizontal direction

Table 1 shows the specifications of the examples and comparative examples.

  “Vertical tension” in “How to tension” in Table 1 means that the longitudinal direction of the outer wall surface material is arranged in the vertical direction. Further, “4” in “number of sheets” means that four outer wall members are arranged in parallel in the horizontal direction.

Moreover, the Example of Table 1 is an example which assumed the structure in FIG. 1 (except a moisture waterproof sheet).
The comparative example 1 is the structure which excluded the trunk edge and the outer wall surface material with respect to the Example.
Comparative Example 2 has a configuration in which bracing is omitted from the example.

(2) Test conditions The evaluation test was conducted in accordance with the test method described in the “Testing and Evaluation Work Method for Wooden Bearing Wall and Its Magnification” issued by the Building Materials Testing Center.

(3) Test results Table 2 shows the test results.
Reference value A is the sum of the numerical values of Comparative Example 1 and Comparative Example 2.
The reference value B is obtained by dividing the value obtained by subtracting the reference value A from the value of the example by the reference value A and multiplying the calculated value by 100 as an improvement rate (%). This is an index showing how much the example shows improved seismic performance (wall strength magnification) compared to the reference value A.

(4) Evaluation Evaluation was performed by obtaining “wall strength magnification”.
The “wall strength magnification” is the four strengths (yield strength Py, ultimate strength Pu, and maximum strength Pmax) used for the wall magnification evaluation described in the “Wooden bearing wall and test method for evaluating the magnification”. , Yield strength at specific deformation) was used by using ultimate yield strength Pu. Specifically, 0.2 × (2 μ−1) ^1/2 × Pu was calculated using Pu obtained in the experiment, and a value obtained by dividing this by the width of the test body (outer wall surface material) was “wall strength. Sampling magnification ". Here, “μ” represents a plasticity ratio and is a value obtained from the relationship between the shear deformation angle and the load in the above experiment.

  As can be seen from the comparison between the example in Table 2 and Comparative Example 1 and Comparative Example 2, it was confirmed that a high wall strength magnification can be obtained by the combination of the brace, the trunk edge, and the outer wall surface material.

  Moreover, although the reference value A is the sum of the values of Comparative Example 1 and Comparative Example 2, it can be seen that this reference value A is lower than that of the example. This means that, according to the configuration of the embodiment, high seismic performance (wall strength magnification) is realized by a combination of bracing, waistline, and outer wall surface material. As for the improvement of this seismic performance (wall strength magnification), the out-of-plane bulge (bulging) of the bracing is suppressed by the torso and siding, so that the deformation of the bracing is suppressed, and as a whole example It is thought that it contributes greatly to increasing the wall strength magnification. Specifically, as can be seen from the reference value B, the combination of bracing, torso edge, and outer wall material improves the wall magnification by 21% and the wall strength magnification by 14% compared to the reference value A. It is done.

  As described above, according to the embodiment, high earthquake resistance (wall strength magnification) can be obtained. And the form of this Example is applicable about the location where a brace is arrange | positioned in the existing conventional wooden house. For example, when improving the seismic performance by renovating the outer wall, by using the existing bracing and applying the configuration of this embodiment, the existing bracing is effectively used and the high seismic performance ( Wall strength magnification) can be obtained.

  Further, as a preferred embodiment for suppressing the out-of-plane direction of bracing, in the specification of Example 1, the outer wall material has conventionally been generally set to a bending fracture load of 690 N or more according to the standard of JIS A5422. It is preferable to use a bending fracture load of 900 N or more.

  Similarly, with regard to a screw for fixing the outer wall surface material, a screw having a diameter of about 2.3 mm to 2.9 mm and having a length of less than 40 mm to less than 50 mm has been conventionally used. As mentioned above, it is preferable to use the thing of 50 mm or more in length.

  Similarly, the fastening of the outer wall surface material is preferably within a pitch of 303 mm in the longitudinal direction and within a pitch of 150 mm in the lateral direction in correspondence with the arrangement of the trunk edge.

  Similarly, it is preferable that the arrangement interval in the vertical direction of the trunk edge is within the range of about 303 mm, which is generally about 450 mm.

  Similarly, it is preferable to use a longer nail, such as CN65 or CN75, for the nail for fastening the trunk edge, which is conventionally defined only as a length of 60 mm or more. .

  Similarly, it is preferable to use a structural plywood having a higher bending rigidity as a material for the trunk edge than a conventional timber such as cedar or tsugi.

  The configuration described above is a configuration that has not been considered in the past because it has not been considered to suppress the interference in the out-of-plane direction of the bracing by the trunk edge and the outer wall surface material, This is the first finding found. These designs can improve the seismic performance reliably.

  The configuration of the present invention can be applied to ensure the seismic performance in the outer wall structure of a newly built conventional wooden house, and can also be applied to the case where the seismic performance is improved by renovating an existing conventional wooden house. it can.

1A Beam material 1B Beam material 2A Column 2B Column 2C Column 3A Space column 3B Space column 4A Bracing 4B Bracing 5 Moisture permeable waterproof sheet 6 Trunk edge 7A Outer wall material 7B Outer wall material 10 Outer wall structure

Claims (2)

On the outside of the bracing room, the torso is fixed to the pillar, which is the building frame, in the direct direction.
An outer wall structure of a conventional wooden house, wherein an outer wall surface material constituting an exterior surface is disposed in a direction orthogonal to the trunk edge on the outdoor side of the trunk edge. Providing a bracing between the beam and the column;
A step of providing a torso that is fastened to the building frame on the outside of the bracing;
A method for constructing an outer wall of a conventional wooden house, comprising a step of attaching an outer wall surface material constituting an exterior surface to the outer edge of the trunk edge, while being fixed to the trunk edge.

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