对旧桥伸缩缝的维修，近年来一直是公路养护部门所面临的问题。特别是对年代前修建的桥梁，因其跨径小，伸缩量不大，大多数的伸缩装置采用多层油毛毡或“U”型镀锌铁皮，标准较低。随着时间的流逝和车辆荷载的反复作用，目前大部分装置已在自然老化和锈蚀中脱落，遗留的将是宽 Maintenance of the expansion joints of the Old Bridge has been a problem faced by the road maintenance department in recent years. Especially for the bridge built before the age, because of its small span, the amount of expansion is not large, most of the telescopic device using multi-layer oil felt or “U” type galvanized sheet metal, lower standards. With the passage of time and the repetitive effects of vehicle loads, most of the devices have now been shed in natural aging and rusting, leaving behind a wide