纵断面最小坡长(国外英文资料).docVIP

纵断面最小坡长(国外英文资料) (2) longitudinal grade of bridge tunnel The longitudinal slope of the bridge should not be more than 4%. No more than 3% of non-vehicle traffic in the vicinity of the town is located near the bridge. The small bridge contains the slope along the route. The longitudinal slope of the tunnel shall not be greater than 3%, and shall not be less than 0.3%; A tunnel with a separate hole and a length of less than 50 meters is not subject to the above restrictions. (3) longitudinal grade of non-vehicle traffic If the road of non-vehicle traffic is heavy, the slope should be slowed down according to the specific situation. The plain microdome is generally not more than 2 percent to 3 percent, and the mountainous area is generally not more than 4 to 5 percent. (2) the minimum incline To make highway driving fast, safe and smooth, hope highway longitudinal slope design smaller, but in the long cutting low embankment, and other horizontal drainage not unblocked, subgrade and influence its stability, prevent water infiltration rules at all levels of road section length cutting, and other horizontal drainage clogged roads, all should be not less than 0.3% of the grade. When must design level slope (0%) or less than 0.3% of the longitudinal slope, side ditch drainage design should be considered with the longitudinal slope design, its design should make vertical drainage ditches. (3) the slope is limited The slope length limits include the minimum slope length and the longest slope. Maximum slope length limitation The maximum length limit is the distance that controls the vehicle on the ramp when the speed is lowered to the minimum permissible speed. The steeper the slope, the longer the slope, the greater the effect. The standard limits the maximum slope length of various slopes of various highways, as shown below. The length limit of the length of the highway at various levels The slope of the slope is long When a continuous steep slope is composed of several slop