橋きょう脚きゃく舟しゅう

noun

pontoon

A flat-bottomed boat or floating structure used to support a temporary bridge or as a floating platform.

• 工こう兵へいが橋きょう脚きゃく舟しゅうを並ならべて仮かり橋ばしを架かけた。

  The engineers lined up pontoons and built a temporary bridge.