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１．概 要
この門柱は、昭和５年（１９３０）に造られた学校の石造門である。７９年を過ぎた現在も、地域の遺産として歴史を刻んできた石造門は、まさに貴重な『歴史的文化財』である。
現在では、風化等の影響で門柱の一部は亀裂や剥落が発生し、１０年程前の修復工事の後も剥落が再発している。
２．保存処理の目的と方法
門柱は、吸水性が高い砂岩を使用しているため、風化による亀裂・剥落が激しく、建立当時の姿が徐々に失われつつある。１９９９年秋には一度、補修工事が行われた。工事では、風化による埋没部の復旧、劣化ブロックの入れ替え（補填）、補填石（凝灰岩）を補色処理、基礎の吹き付けなどが行われた。しかし、９年を経過した現在では、補色材が薄層剥離によって露出したり、目地も損傷したりと、損傷が著しい状態であった。
今後は内部まで雨水が浸水することで、更なる劣化が危惧されるため修復が必要とされた。
保存処理作業中
３．強化保存処理
処理前後の比較
上段･･･門柱正面（砂岩質）
下段･･･門柱裏面（ 〃 ）
補修跡の剥落やスプーンカットのような角を補填した。