ガスバルブ井の工事
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質問です：ガス用鋼製バルブとPEバルブのバルブハウスには、どちらも砂を詰める必要がありますか？ 砂を埋める作用とは何ですか？
漏れ出た天然ガスが空気と混ざって爆発性のガスを形成するのを防ぐべきだ
可燃物が低地に溜まって火災や爆発が起こるのを防ぐため、砂で平らにします。
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