広瀬川地区橋梁(広瀬川橋りよう，西公園高架橋)

摘要

The Hirosegawa Railway Bridge and Nishi Koen Viaduct Project was planned on low-lying land where the Sendai City Rapid Transit Tozai (East-West) Railway Line crosses the Hirose River. Due to the project's physical division of the scenic area symbolic of the "City of Trees", the City of Sendai held the nation's first design competition for a railway bridge to select a suitable design. Through the design, the selected proposal transforms the image of the bridges as a disruptive elements piercing through the park into "a stage from which new activity emerges." This is achieved by a three-span continuous prestressed reinforced concrete rigid-frame box girder bridge for the river bridge that possesses visual coherence with Ohashi Bridge located 200m downstream, and by creating a park promenade with the viaduct via a rigid-frame bridge with concrete-filled steel tube (CFT) columns and a reinforced concrete slab with diminutive 5m spans.%広瀬川地区橋梁（広瀬川橋りよう及び西公園高架橋）は仙台市高速鉄道東西線が広瀬川を渡河する低地部に計画された.この2橋は社の都を代表する景観形成地区を分断しており，仙台市はデザィン的に優れた橋梁の計画が必要と考え，鉄道橋ではわが国初となる設計競技を開催した. 選定案は「公園を貫く迷惑な橋」を「新たな活動を生む舞台」に変換しょうというもので，渡河橋は200m下流の大橋との同時眺望性から3径間連続PRCラーメン箱桁橋に，高架橋は公園内のプロムナードとしての用途から支間わずか5mのRCスラブ式CFT柱ラーメン橋にしている.