Installation structure of base of exterior wall

Abstract

In external renovation of a wooden framework house in which a bearing face material is used as an exterior wall base member, is capable of partly increasing the wall strength factor, thereby providing a high degree of freedom of seismic design and, furthermore, facilitating installation of an exterior material such as ceramic siding after seismic reinforcement.A reinforcement member for preventing punching shear is interposed. Between a bearing face material of a wall that is required to have a high wall strength factor by a seismic design and a nailhead of a nail for fixing the bearing face material to a structural member.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an installation structure of a base of an exterior wall that can be used at the time of external renovation of a wooden framework house in order to improve a seismic performance of the house.[0003]2. Description of Related Art[0004]An example of conventional methods for improving the seismic performance of a wooden framework house is a structure in which an iron bracing material (brace) or frame material is attached to an outer side of a building for reinforcement. However, even though such a method has an advantage in that an occupant of a house can dwell in that house during reinforcement work because the reinforcement material is installed externally, the bracing material or the frame material attached to the outer side of an exterior wall will significantly reduce the aesthetic appearance of the house.[0005]On the other hand, in the case of a seismic performance improvement method in...

AI Technical Summary

Benefits of technology

[0016]As a method for enhancing the wall strength factor other than the above-described methods, a method in which the number of nails to be driven in to fix the bearing face material to a structural member of a wooden framework house is increased or the thickness of the nails is increased is conceivable. However, increasing the number of nails to be driven in causes cracking of the bearing face material or the structural member and thus increases the likelihood of an installation defect. On the other hand, the method in which the thickness of the nails is increased increases the risk of breakage of the bearing face material by a nailhead, that is, the occurrence of punching shear and the resulting breakage of the bearing face material by the nail. In particular, in the case of a bearing face material having a low specific gravity, the risk of breakage increases. Thus, it is not easy to enhance the wall strength factor by the method in which the number of nails to be driven in is increased or the method in which the thickness of the nails is increased.

[0018]The present invention has been made to solve problems as described above, and it is an object thereof to obtain a base of an exterior wall that can be used in external renovation of a wooden framework house in which a highly air-permeable bearing face material is used as an exterior wall base member and that provides a high degree of freedom of seismic design and, furthermore, facilitates installation of an exterior material such as ceramic siding after seismic reinforcement.

[0035]As described above, with the installation structure of a base of an exterior wall according to the present invention, even when a combination susceptible to punching shear, of the bearing face material 2, the structural member 1, and the nail 3 is used, it is possible to prevent punching shear by interposing the reinforcement member 4 between the nailhead 3a and the bearing face material 2. Accordingly it is possible to achieve a high load value of shear capacity of nailed connection.

[0036]Therefore, in external renovation of a wooden framework house, even when a bearing face material that has good air permeability but is regarded as having a low strength against pull-out by a nailhead is used, it is possible to achieve a high wall strength factor by adopting the installation structure, in which a reinforcement member for preventing punching shear is interposed between a bearing face material serving as an exterior wall base member and a nailhead for fixing the bearing face material to a structural member, for a wall that is required to have a high wall strength factor by seismic design calculation. Therefore, a flat base of a wall can be obtained even when nails of a single type are used together with bearing face materials of the same type and the same thickness, and thus it is possible to perform design and installation in such a manner that walls having a high wall strength factor and walls having an ordinary wall strength factor coexist.

[0037]Therefore, the use of the installation structure of a base of an exterior wall according to the present invention eliminates the necessity to use an additional reinforcing metal fitting in order to enhance the wall strength factor, makes it possible to form a flat and smooth-surfaced base of a wall, and thus facilitates installation of an exterior material. Furthermore, since a bearing face material having good air permeability can be used, it is possible to impart a high wall strength factor to only a wall that is required to have a high wall strength factor by seismic design calculation while adopting a bearing face material having good air permeability. Consequently, an installation structure of a base of an exterior wall that provides a high degree of freedom of seismic design and a great ease of installation can be obtained.

Problems solved by technology

Thus, unlike seismic design for construction of a new building, there are many restrictions, and it is required to perform seismic design under restrictions on the degree of freedom of design.

However, the method in which the type of some of bearing face materials is changed leads to an increase in the number of types of bearing face materials and thus impairs the ease of installation.

Moreover, although it is also possible to use bearing face materials of the same type with different thicknesses, this method leads to the occurrence of unevenness in the wall base member, and therefore this method significantly impairs the ease of installation as well.

However, increasing the number of nails to be driven in causes cracking of the bearing face material or the structural member and thus increases the likelihood of an installation defect.

On the other hand, the method in which the thickness of the nails is increased increases the risk of breakage of the bearing face material by a nailhead, that is, the occurrence of punching shear and the resulting breakage of the bearing face material by the nail.

In particular, in the case of a bearing face material having a low specific gravity, the risk of breakage increases.

Thus, it is not easy to enhance the wall strength factor by the method in which the number of nails to be driven in is increased or the method in which the thickness of the nails is increased.

However, due to the low specific gravity, these bearing face materials have low nail-holding power and also are susceptible to punching shear, and therefore it has not been easy to achieve a high wall strength factor with these materials.

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