今回のテーマは『通し柱』です。
通柱とは、1階から2階まで貫く約6mの長い柱です。
通柱は結論から言うとあまり重要ではありません。
通柱の耐力はそれほど高くないからです。
建物の四隅に入れて耐力を出すイメージがありますが、実はそれほど耐力があるわけではないのです。
通柱を用いる場合、一般的に１階の天井部分に梁材を取り付けます。
柱の途中に開けた穴に先端を細くした梁を垂直に差し込みます。
通し柱に穴が開くと当然その部分は弱くなります。
実際に、地震などの力が建物に掛かると、通柱が折れてしまうことがあります。
だた差し込むだけでは、4寸角程度の通し柱では耐えきれないのです。
「じゃあ、どうすればいいの？」
弱くなった部分を金物で補強します。
１階天井の梁の部分にホールダウン金物といわれてるもので、１階部分と２階部分をつないで耐力を増強させます。
弱い部分をきちんと補えば、耐力は保たれます。
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