在日本,存在大量的道路路边排水沟。大约从25年前开始,沟体和沟盖一体化的各种路边暗沟开始逐渐在施工中得到应用,暗沟的中空形状也得到拓展,有圆形、方形、心形、卵形等。以下介绍的是日本湿法浇注成型的卵形混凝土制品。图1中的卵形暗沟制品水力特性好,即便排水量很小,也能保持 In Japan, there are a large number of roadside drainage ditches. About 25 years ago, a variety of roadside ditches integrated into ditches and ditches began to be gradually applied in construction. The hollow shape of the ditches was also expanded to include round, square, heart-shaped and oval shapes. The following is the Japanese wet cast oval concrete products. The oval gutter product in Figure 1 has good hydraulic characteristics and can be retained even with low displacement