抄録：ダクタルを用いた橋梁建設技術の開発

ダクタルを用いた橋梁建設技術の開発

－ダクタルＰＣ橋梁の計画から施工まで－
武者浩透^＊１・田中良弘^＊２・大竹明朗^＊１
高性能でしかも美しい橋梁を実現するため、従来の鉄筋コンクリートとは全く異なる設計概念を持つ超高強度繊維補強コンクリート「ダクタル」の橋梁への適用技術を開発致しました。このダクタルは、圧縮強度２００N/mm²以上と鋼材に匹敵する強度を有し、靭性や耐久性など、あらゆる面で従来コンクリートの一桁上の性能を持ちます。この開発により、ダクタル構造物の構造評価や品質管理手法、そして施工における要領や管理手法が確立され、土木学会から刊行される「超高強度繊維補強コンクリートの設計・施工指針（案）」に盛り込まれています。ダクタルの橋梁への適用により、従来のコンクリート橋では成し得なかった長スパン、低桁高、大幅な軽量化が実現されました。またダクタル橋梁はデザイン性に優れ、ライフサイクルコストやＣＯ2排出量の削減など、景観や環境面でも優れた性能を持ち、コンクリート橋梁の新しい形を提案致します。
キーワード：	超高強度，繊維補強コンクリート，高耐久，ＰＣ橋梁，低桁高，軽量化

Development of Bridge Construction Thechnology that uses DUCTAL

- All processes from the plan of Ductal PC bridge to construction -
Hiroyuki MUSHA ^1, Yoshihiro TANAKA ^2 and Akio OHTAKE ^*1
To achieve a beautiful and high performance bridge, the application technology of "Ductal" to the bridge was developed. Ductal is a kind of ultra-high strength fiber reinforced concrete and has a quite different design concept. This Ductal possesses strength of 200N/mm² or more in compression, which equal to a steel material, and has one class higher performance than conventional concrete in all respects such as toughness and durability. We have developed the management technique in a structural evaluation, the quality control technique, and the method of construction of the Ductal structure. This development is included in "Design and construction indicator (idea) of the ultra-high strength fiber reinforcement concrete" that is published by Japan Society of Civil Engineers. By applying Ductal to the bridge, not only a long span and low girder height bridge, but also a big weight reduction has been realized. Those couldn't have been done with conventional concrete. Moreover, the Ductal Bridge will have a performance that excels in the design, and is excellent on a spectacle and an environmental side such as the reductions in the life cycle cost and the amount of the CO2 exhaust. The Ductal Bridge will propose shape with a new concrete bridge.
keywords:	ultra-high strength, ｆiber reinforced concrete, durability, bridge, low girder height, weight reduction