JPS6339296Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a load-bearing wall material used for the interior and exterior walls of a wooden house, and more specifically to an inexpensive wall sheathing material that has effective mechanical strength against horizontal loads such as earthquake force and wind pressure. In general, in wooden buildings, it is customary to provide unit frames or load-bearing walls to safely and effectively resist the horizontal loads that act on them, and the latter type of load-bearing wall structure is particularly common. be. There are two types of load-bearing wall structures: structures that use diagonal members such as bracing and bracing to resist horizontal forces, and structures that use structural plywood nailed to columns, foundations, girders, etc.
Most conventional wooden houses were constructed using the former type of structure, but in recent years, as seen in the frame wall construction houses introduced from North America, structural plywood, hardboard, and particle board have been used. A load-bearing wall structure in which noncombustible boards such as wood boards, flexible boards, calcium silicate boards, and pulp cement boards are nailed to the framework has been approved by the Ministry of Construction, and construction methods using load-bearing facing materials are more popular than methods using braces. There is a growing trend to reconsider the bracing construction method for traditional wooden houses. In other words, in order for a load-bearing wall using braces to effectively resist horizontal forces, the relationship between the braces and the frame,
In particular, it is necessary to be very careful when attaching to foundations and girders, making the construction complicated and requiring a high level of skill, but the skill level of the constructor decreases significantly, making it difficult to achieve the desired purpose. Although construction methods using various hardware have been developed to streamline brace construction, the reality is that there are many defects such as cracks in the braces during construction, and in the future it will be difficult to improve the strength of conventional wooden houses. It is assumed that a load-bearing wall structure in which timber is nailed to a frame will become common. By the way, if a horizontal force acts on a wall structure with underlayment nailed to the framework or framework, that force will be transmitted to the underlayment through the framework or nail joints, so in that sense, the underlayment The in-plane shear modulus of elasticity, which indicates the resistance to deformation of a load-bearing wall, can be said to be an important factor that affects the structural strength of a load-bearing wall. However, in reality, the transmission of the horizontal force applied to the frame or frame to the siding material is affected by the condition of the nail joints in the siding material. In other words, the in-plane rigidity of the underlayment is generally much greater than the in-plane rigidity of the wall, and the joints with the nails control its yield strength. In addition, the mutual displacement between the face material and the frame material in the wall under horizontal load is large in the horizontal direction on the top and bottom of the underlayment material, and in the vertical direction on the left and right sides. The corner portion is the largest, and the corner portion is damaged, resulting in a decrease in yield strength. To give an example, in a load-bearing wall using the framed wall construction method using 9 mm thick structural plywood as the underlayment, the load-bearing wall with a height of 2420 mm and a width of 1820 mm calculated using the shear elastic modulus of the structural plywood is 1/100. The horizontal load that causes radian deformation is 6,900 kg, but actual tests have shown that even 1,800 kg causes failure not due to shear failure of the structural plywood, but due to failure of the nail joints. As a result of recognizing the above-mentioned circumstances, the inventor of the present invention has developed a system that takes full advantage of the shearing performance of the underlay material.
We were acutely aware of the need to devise an underlay material that could be provided at low cost and in line with resource conservation policies, leading us to complete this invention. Therefore, an object of the present invention is to provide a new load-bearing wall material that can meet the above requirements. That is, the gist of the load-bearing wall material of this invention is that in a load-bearing wall material used as a lining material for the inner and outer walls of a wooden house, the thickness of the nailed portion on the outer periphery is thicker than that of the flat plate-shaped portion on the inside. Embodiments of the present invention will be described below based on the drawings. FIG. 1 and FIG. 2 each show an embodiment of the load-bearing wall material of the present invention. In these embodiments, a frame-shaped protruding band 2 is provided at the nailing site on the outer periphery of the flat underlay material body 1, and the thickness of that portion is made greater than the thickness of the other underlay material body 1. It is also thicker. As a material for underlayment,
Wooden boards such as plywood, hardboard, and particle board, flexible boards, calcium silicate boards, and noncombustible boards such as wood chip cement boards, which are generally used as load-bearing wall materials, can be used. In order to obtain such an underlayment material, it is possible to hollow out the center of a thick plate-like material, but from a cost standpoint, it is difficult to create a strip of homogeneous material or a different material on the outer periphery of the flat underlayment material body. A method of secondarily adhering the materials is common and advantageous. In that case, it is preferable to form a groove in the underlay material body and partially embed the strip-shaped member therein. Furthermore, when using a different material, it is preferable to glue one that has better nail shearing performance than the underlay material itself. In actual construction, as shown in FIG. 3, the frame-shaped protruding band 2 of the underlay main body 1 may be nailed to a frame member 3 such as a stud with nails 4 or staples. In the underlayment material of the present invention, when comparing the nail bonding performance between the thick protruding band portion of the outer circumferential portion and the central portion, the thick outer circumferential portion exhibits higher values for both initial rigidity and final yield strength. For example, in the case of plywood, when the relative displacement between the frame material and the plywood is 1 m/m, the load is 7 m/m per CN50 nail.
The thickness is 40Kg, and the final yield strength is 140Kg at 7m/m thickness, and 165Kg at 9m/m thickness.
Therefore, if a plywood underlayment is 7m/m thick and the thickness of the nailed part on the outer periphery is 9m/m, it is possible to obtain the same strength as a wall using 9m/m thick underlayment. It is. The thick nailing area of the underlayment material has a particularly large effect on the outer periphery of the wall where the relative displacement between the frame and the underlayment material is large, and the width of this protruding band should be approximately 10 m/m or more to facilitate nailing. It is. Incidentally, structural plywood (conventional product) with a thickness of 6m/m
and a width of 20mm on the outer periphery of the structural plywood with a thickness of 6m/m.
A load-bearing wall (1820 m/m x
2420m/m size), the shear test results of a wall nailed using CN50 nails at intervals of 100m/m on the outer circumference and 200m/m on the inside are as shown in the table below.

[Table] In this way, by increasing the thickness of the outer periphery nailing area, the nail joint shear strength can be shown to be far superior to that of underlaying materials with the same thickness in other areas. As mentioned above, the underlayment of the present invention makes it possible to obtain a significant structural strength with just a small amount of additional material, which contributes to resource saving. earthquake resistance of buildings;
Its practical benefits are immeasurable, including the ability to significantly improve wind resistance.

[Brief explanation of the drawing]

1 and 2 are perspective views showing one embodiment of the present invention, and FIG. 3 is an explanatory view showing an example of construction of the underlay material of the present invention. 1...Underlayment main body, 2...Protruding band, 3...Frame material, 4...Nail.

Claims (1)

[Scope of utility model registration request] A load-bearing wall material used as a lining material for the inner and outer walls of a wooden house, characterized in that the thickness of the nailed part on the outer periphery is thicker than the flat plate-shaped part on the inside.