ビスの活用について

長ほぞ差し込栓打ち接合部の引張り試験
長ほぞ差し込栓打ち接合部の引張り試験

 昨今、大多数の木造住宅において、柱と梁(はり)の交点などジョイント部分において、部材間の接合を強化するために接合金物が使われています。接合金物ではビスを用いることが多いため、その意味で現代は釘の時代というよりはビスの時代といえるかもしれません。

 その接合金物は、地震などの際に建物が持ち上がらないように(引き抜き防止)することに寄与しているといえますが、法律で定められている引き抜き防止策の中で金物を使わない唯一の方法は、凸状に加工した柱を凹状に加工した土台や梁などの水平材に差し込んで木栓(込栓:こみせん)を打つ「長ほぞ差し込栓打ち」があります。ただし通常、打ち込む栓は1つのジョイントにつき1本だけなので、接合部を回転させようとする力に対しては込栓だけでは抵抗することができません。

多数本のビスによる回転抵抗
多数本のビスによる回転抵抗

 宇都宮市で工事中の混構造の住宅では、柱と水平部材のジョイント部に複数の、粘り強いビスを用いることで、引き抜きのみならず、回転に対しても効果的な接合部をつくり、耐力壁を少なくすることを可能にしています。ちなみに今回用いたビスは、東日本パワーファスニング社製のパネリードⅡ+という製品で、各種の性能が明らかにされているすぐれものです。

 ただ、ビスとはいっても、締めているうちに頭部がちぎれてしまったり、折れ曲がってしまうものが市販品には多いので、構造的な部分に用いる場合には注意が必要です。

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コメント: 19
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