Main indicators of this set of single hole reinforced concrete box culvert (general drawing, standard drawing) drawings: headroom: 1.5 * 1.25, 2.0 * 1.5, 2.0 * 2.0, 2.5 * 2.2, 3.0 * 2.5, 3.0 * 3.0, 4.0 * 2.2, 4.0 * 3.0, angles of 0, 10, 20, 30, 40, 45 degrees