Concrete screeding machine with elevation control over contoured support surface

A screeding machine for screeding uncured concrete at a support surface, the screeding machine comprising:

• a base unit;
• a screed head assembly supported at the base unit, wherein the screed head assembly comprises (i) a grade establishing member and (ii) a vibrating member;
• wherein the screed head assembly includes (i) first and second actuators operable to adjust a height of respective end regions of the grade establishing member of the screed head assembly, and (ii) a sonic tracer at a first end region of the screed head assembly for sensing a screeded concrete surface adjacent to concrete being screeded during a screeding pass of the screeding machine;
• wherein the base unit includes (i) a laser sensor that senses a laser plane and (ii) an angle sensor;
• a control system, wherein the control system is operable to control the first actuator to adjust elevation of the first end region of the grade establishing member of the screed head assembly responsive to the sonic tracer;
• and
• wherein the control system is operable to control the second actuator to adjust elevation of a second end region of the grade establishing member of the screed head assembly based at least in part on (i) sensing of the laser plane by the laser sensor disposed at the base unit, (ii) an angle determined by the angle sensor disposed at the base unit, and (iii) a target thickness of the concrete at the support surface.

A screeding machine for screeding uncured concrete at a support surface, the screeding machine comprising:

• a base unit;
• a screed head assembly supported at the base unit, wherein the screed head assembly comprises (i) a grade establishing member and (ii) a vibrating member;
• wherein the screed head assembly includes (i) first and second actuators operable to adjust a height of respective end regions of the grade establishing member of the screed head assembly, and (ii) a sonic tracer at a first end region of the screed head assembly for sensing a screeded concrete surface adjacent to concrete being screeded during a screeding pass of the screeding machine;
• wherein the base unit includes an angle sensor;
• a control system, wherein the control system is operable to control the first actuator to adjust elevation of the first end region of the grade establishing member of the screed head assembly responsive to the sonic tracer;
• and
• wherein the control system is operable to control the second actuator to adjust elevation of a second end region of the grade establishing member of the screed head assembly based at least in part on (i) an angle determined by the angle sensor disposed at the base unit, and (ii) a target thickness of the concrete at the support surface.