Hydro-Jet RD工法 / Hydro-Jet RD method

従来の合成桁橋の床版取替は長期の通行止め期間を必要とし、鋼桁とコンクリート床版の接合部（以下、接合部）の除去に手間取ることが撤去技術の課題でありました。そこで、その接合部の除去作業を、通行規制を行わずに通行止め開始日までの準備期間に行えるHydro-Jet RD 工法（Hydro-Jet demolition technique for Replacing the decks）を開発しました。通行止め開始後における接合部の除去作業を不要とし、1回の床版撤去範囲を鋼桁位置に関わらず大きく設定することで、床版撤去期間とこれに伴う交通規制期間を短縮できます。
本工法は、阪神高速道路株式会社が募集するコミュニケーション型共同研究に、飛島建設株式会社と第一カッター興業株式会社が応募し、3社共同で開発した技術です。
Replacing the floor slab of a conventional composite girder bridge requires a long period of suspension of traffic, and removing the joint (hereinafter referred to as the joint) between the steel girder and the concrete slab was an issue for the removal technology.
For this reason, we have developed the Hydro-Jet demolition technique for replacing the decks, which allows the removal of the joints during the preparation period until the date of the suspension of traffic without restricting traffic.
By eliminating the need to remove joints after closing the road, the slab removal area can be set large regardless of the position of the steel girder, thereby shortening the slab removal period and the associated traffic regulation period.
This construction method is a technology jointly developed by three companies, applying for Tobishima Corporation Co., Ltd. and Daiichi Cutter Kogyo Co., Ltd. for a communication-type joint research recruited by Hanshin Expressway Co., Ltd.