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在道路和小型河道等项工程施工中,对于内部空间宽5 m以上的大型箱涵(矩形涵洞),须根据道路和河道条件,在施工现场多为图1所示斜角箱涵。箱涵的用途,如为道路是为下通道进行设置,如为小型河道则兼作道桥使用。作为箱涵的施工方法大致有三类:现浇混凝土;全预制混凝土;预制混凝土与现浇混凝土相结合的半预制方式。表1为这三类箱涵的特征。如何选择使用,须根据跨长、工期、经济性和施工性等因素进行考虑确定,如跨度在5 m以上的斜角作为条件,一般都从经济性观点出发,多采
For the construction of roads and small river courses, large box culverts (rectangular culverts) with an internal space of more than 5 m in width shall be mostly diagonal box culverts as shown in Figure 1 at the construction site according to the road and river conditions. Box culvert purposes, such as the road is set for the next channel, such as the small river is also used as a bridge. As a culvert construction methods generally have three categories: cast-in-place concrete; precast concrete; precast concrete and cast-in-place concrete combination of semi-prefabricated way. Table 1 shows the characteristics of these three types of box culverts. How to choose to use, to be based on cross-length, duration, economy and construction and other factors to consider to determine, such as the span of more than 5 m bevel as a condition, generally from an economic point of view, more mining