福建省高速公路桥梁拼接技术状况调查与分析

Investigation and Analysis on Splicing Technology of Expressway Bridges in Fujian Province

福建省许多桥梁面临拼接改造,为减少拼接后结构病害及维养压力,需对已有拼接桥梁的技术状况进行调查研究,并分析拼接设计方案的合理性。分析结果表明,福建省高速公路桥梁拼接的新旧主梁均采用相同的截面型式,且板梁占绝大多数,T梁次之,箱梁很少;板梁的拼接主要采用上连下不连的形式,且病害少于其他形式;T梁的拼接全部采用上连下不连的形式,病害最多但仍能满足桥梁正常使用要求;箱梁的拼接主要采用上下均不连的形式,常发生翼缘啃边和渗漏现象。从防治桥梁病害角度看,相同主梁截面的桥梁拼接宜采用上连下不连的拼接形式。

Many bridges in Fujian Province are facing the splicing reconstruction.In order to reduce the structural diseases and maintenance pressure after splicing,it is necessary to investigate and study the technical status of the existing spliced bridges,and analyze the rationality of splicing design scheme.The analysis results show that the same section types are all used for the old and new girders in the splicing of expressway bridges in Fujian Province,and plate girder is the majority,T girder is the second and box girder beam is very few.The splicing of plate girder mainly adopts the form of connecting the top and not connecting the bottom,and the disease amount is less than those of other forms.The splicing of T girder all adopts the form of connecting the top and not connecting the bottom,and its disease amount is the most,but it can still meet the normal use requirements of bridge.The splicing of box girder mainly adopts the form of all not connecting the top and the bottom,and the flange gnawing and leakage phenomenon frequently happen.Therefore,from the perspective of disease prevention and control,the splicing form of connecting the top and not connecting the bottom is suitable to use for the splicing of the bridges with the same section of the main girders.