第二吾妻川橋りょう

摘要

Constructed as part of the relocation of Japan Railway's Agatsuma Line, the Second Agatsumagawa Bridge is a railway bridge consisting of a simple prestressed reinforced concrete box girder half-through bridge and a three-span continuous prestressed reinforced concrete box girder half-through bridge that crosses National Road No. 145 and the Agatsuma River, with a 600m left curve radius approximately lkm from the Iwashima Station in the direction of the terminus point. As a result of this intersecting condition, the main bridge section has a length of 390m (three continuous spans of 110.4m, 167.0m and 110.4m), with a 167m central span, the nation's longest spanning panel bridge. With a 600m radius plane curve in the panel section, the main girder employs a ribbed box girder cross section of high rigidity.%第二吾妻川橋りょうは，JR吾妻線付替え工事の一環としてrn建設される単純PRC小路箱桁橋と3径間連続PRC斜版中路箱rn桁橋からなる鉄道橋であり，吾妻線岩島駅から終点方約1.0krnm地点から，半径600mの左曲線により国道145号,吾妻川をrn横断する．この交差条件から,主橋部は橋長390m（3径間連続：rn110.4m＋167.0m＋110.4m）となり，中央径間167.0mは斜版橋rnとして国内最長スパンである．また．斜版部分に半径600mのrn平面曲線を有していることから主桁も剛性の高いリブ付き箱rn桁断面を採用している．