https://tsukunobi.com/tsukunobinews/tokyo-undergrounding-utility-poles-725km-planツクノビ建設ニュースja2026-05-20T17:36:16+09:00東京都無電柱化、新規着手320km＋事業中405km＝都道725kmに https://tsukunobi.com/tsukunobinews/construction-companies-483823-year-on-year-123-changeツクノビ建設ニュースja2026-05-19T12:44:31+09:00全国48万3,823者・前年比+123のみ、業者数の入れ替わりが加速