一、概述 目前的铁路机车灰坑,大多采用混凝土或钢筋混凝土等结构,由于材料、施工、使用等多方面的因素,灰坑混凝土的耐腐蚀性能及整个灰坑建筑物的使用年限远远达不到设计要求。在北方严寒地区,一般混凝土建筑物的使用年限都应达到75～100年,而浑江工务段管内的灰坑设备正常使用时间一般仅7～8年就 I. Overview The current railway locomotive ash pits mostly use concrete or reinforced concrete structures. Due to various factors such as material, construction and use, the corrosion resistance of ash concrete and the service life of the entire ash pit building are far reaching Less than the design requirements. In the northern cold area, the general service life of concrete structures should reach 75 to 100 years, while the Hun pipe pits of gray pit equipment normal use of time is generally only 7 to 8 years