开启桥
打开桥(英语:Moveable bridge),亦称活动桥、开合桥或可动桥,是为通航需要,桥身能以立转、平转、直升等方式开合的桥梁。适用于交通不很频繁而须航行高大船只的河道或港口,优点是墩台较低,因而能减少两岸引桥和路堤的工程量;但需要增加机械维修费用。
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伦敦塔桥
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