Radius rule for measuring curve

The utility model relates to a radius rule for measuring curves. In order to solve the problems that the existing manual railway curve measurement mode has the disadvantages of time waste, big error and inconvenience, the utility model provides the radius rule for measuring curves which is characterized in that the radius rule for measuring curves is mainly composed of a T-shaped ruler and a straight-line displacement measuring device, wherein the T-shaped ruler is divided into a transverse rod and a vertical rod; the straight-line displacement measuring device is mainly composed of a measuring rod, a transmission system and a reading device; the straight-line displacement measuring device is fixed to the joint of the transverse rod and the vertical rod of the T-shaped ruler or arranged on the vertical rod. The radius rule for measuring curves of the utility model can be conveniently read out curve radius values from a dial plate. Compared with the method of manual measuring tape measurement, the radius rule for measuring curves has the advantages of simple operation, precise data, time saving, labor saving and convenience.