各种各样的桥梁桥梁指架设在江河湖海上，使车辆行人等能顺利通行的建筑物。桥梁一般由上部构造、下部结构两组成，上部结构主要指桥跨结构和支座系统；下部结构包括桥台、桥墩和基础。桥梁除了的实用功能外，还有美化环境的作用。2/583/584/585/586/587/588/589/5810/5811/5812/5813/5814/5815/5816/5817/5818/5819/5820/5821/5822/5823/5824/5825/5826/5827/5828/5829/5830/5831/5832/5833/5834/5835/5836/5837/5838/5839/5840/5841/5842/5843/5844/5845/5846/5847/5848/5849/5850/5851/5852/5853/5854/5855/5856/5857/58
