最近,读了一篇题为《百年提醒》的文章,大意是:2007年底,上海市政工程管理局收到国外某设计公司的一封来信。信中说,上海外白渡桥当初设计使用期限是100年,1907年交付使用至今已到期,提请对该桥注意维修。信中还特别提醍,在维修时,一定要注意检修水下的木桩基础混凝土桥台 Recently, I read an essay titled “A Reminder for a Century,” to the effect that at the end of 2007, Shanghai Municipal Engineering Administration received a letter from a foreign design firm. The letter said that Shanghai Waibaidu Bridge was originally designed to have a useful life of 100 years. It has expired in 1907 and has been brought to the attention of the bridge for maintenance. The letter also mentioned in particular, in the maintenance, we must pay attention to overhaul underwater wooden footing concrete abutment