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前言。公路旧桥具有荷载等级低、使用年限长的特点。从技术资料分析,大多数桥梁是三不知:①不知基底地质;②不知基础深度;③不知隐蔽部分的尺寸。从桥梁技术状况分析,由于河床屡遭洪水冲刷,河床底部加深,桥梁墩台基础外露、冲空,产生不均匀沉降,导致桥台、拱圈产生附加应力而出现开裂,有的甚至出现开合现象;有的桥
Foreword Old road bridge with load level is low, long service life characteristics. From the technical data analysis, most of the bridges are three do not know: ① I do not know the basement; ② I do not know the depth of the foundation; ③ I do not know the size of the hidden part. From the analysis of the technical condition of the bridge, due to repeated flood erosion in the riverbed and deepening of the bottom of the riverbed, the foundation of the pier and abutment of the bridge is exposed and punched out, resulting in uneven settlement, resulting in additional stress on the abutment and arch ring, cracking and some even opening and closing Phenomenon; some bridge