拱式渡槽是根据恒载压力线与何种曲线接近,来选择拱轴线型。从图1可看出,在拱顶附近抛物线比悬链线偏上,在拱脚附近抛物线比悬链线偏下,各有特色。实腹拱应采用悬链线,空腹拱宜采用本文提出的抛物线束公式计算,并以例题对两种曲线作了比较。 Arched aqueduct is based on constant pressure line with what kind of curve close to select the arch axis type. As can be seen from Figure 1, the parabola near the vault is higher than the catenary and the parabola near the arch is lower than the catenary. The actual abdominal arch should be used catenary, fast arch should be used in this paper parabolic beam formula to calculate, and the two cases were compared to the example.