双曲拱是路桥中较好的结构型式,目前已经广泛采用。因为它的主体结构用双曲拱,这样就传力路线短,所受的弯矩小,而抗弯刚度大,拱轴向压力又有自加预应力的作用,所以主要承受压应力,能较好地发挥混凝土受压的良好性能。钢筋主要按构造配,水泥可用400~# 以下的水泥,模板用钢模或土模,三材用量则大大减少。 Double arch is a better bridge type structure, has been widely used. Because of its main structure with double arches, so that force transmission line is short, the bending moment is small, and bending stiffness, arch axial pressure and self-prestressed role, so mainly to withstand compressive stress, can Better exert the good performance of concrete compression. According to the structure of steel reinforcement, cement available 400 ~ # the following cement, mold steel or mold template, the amount of three materials is greatly reduced.