Powered strike-off plow

A wheeled concrete working device movable over a surface of uncured concrete and operable to establish a desired grade of the uncured concrete surface, said wheeled concrete working device comprising:

• a wheeled support having a frame portion and a pair of wheels rotatably mounted at said frame portion, said wheeled support being selectively movable in a forward direction and a rearward direction;
• a plow assembly mounted to said frame portion, said plow assembly including at least one plow member for engaging the concrete when said wheeled support is moved in said rearward direction, said wheeled concrete working device being operable in response to a signal from a laser receiver mounted at said plow assembly to adjust an elevation of said plow member to establish a desired grade of the concrete when said wheeled support is moved in said rearward direction;
• a bump detecting device operable to detect a surface irregularity of the subgrade upon which the wheels travel and at a location rearward of either of said wheels and in the rearward direction of travel of said wheeled support;
• and
• a controller operable to reduce the rearward speed of said wheeled support in response to a detection of a surface irregularity by said bump detecting device, said controller controlling at least one of said frame portion and said plow assembly to substantially maintain said plow assembly at a desired orientation when at least one of said wheels engages the detected surface irregularity.