混凝土是铁路基本建设中一项基础工程材料。随着我国国民经济建设的发展,铁路基本建设工程有很大的增长,每年混凝土的用量达数百万立米。目前,铁路桥涵和隧道建筑中混凝土工程,有的是现场灌注,有的是预制生产;施工工艺有滑升模板、水下混凝土浇注和泵送混凝土施工;施工季节 Concrete is a basic engineering material in the basic construction of railways. With the development of China’s national economic construction, there has been a great increase in the number of railway infrastructure projects, and the amount of concrete used each year reaches millions of meters. At present, in the concrete projects of railway bridges and culverts and tunnel construction, some are on-site and some are prefabricated; the construction techniques include sliding formwork, underwater concrete pouring and pumping concrete construction; construction season