With the reconstruction of old road , the upgrade of road scale , the accretion of traffic quantity and the manifold of heavy vehicle in my country recently, Our desire is higher and higher about the transit capacity of the old bridges. It is more impendent to confirm practice status and supporting load of these bridges on the calzada.

近年來隨著我國路網(wǎng)改造女潮喷视频、舊路改建和公路等級的提升91av视频在线观看，交通量的日漸增大影音先锋啪啪av资源网，重型車輛的日漸增多视频图片小说，對原有的公路舊橋的通行能力要求愈來愈高日韩侵犯精品视频在线播放，確定此類公路橋梁的實際使用狀況和實際承載力就顯得尤為迫切国产真人一级做a片。