A roller tube concrete finishing machine includes retractable vibration gangs that can be selectively immersed within wet concrete and then retracted with parallelogram linkage. Spaced-apart, drive parallel rollers are journaled between frame ends for supporting and propelling the machine upon and between parallel form rails. A front roller provide a strike-off function. The vibration gangs are deployed by a retractable, parallelogram linkage that moves them forwardly and downwardly for operation, or which retracts the vibrators inwardly and upwardly relative to the frame. When the vibrators are retracted, the are withdrawn upwardly from the concrete and retracted rearwardly towards the machine front to reduce machine dimensions. Substantial retraction of the vibrators prevents subsequent interference with the rebar below. Vibrator retraction reduces overall machine dimensions for clearance and shipping purposes, with gang vibration arrays nested upwardly and inwardly proximate the front of the machine.

A roller tube concrete finishing machine includes retractable vibration gangs that can be selectively immersed within wet concrete and then retracted with parallelogram linkage. Spaced-apart, drive parallel rollers are journaled between frame ends for supporting and propelling the machine upon and between parallel form rails. A front roller provide a strike-off function. The vibration gangs are deployed by a retractable, parallelogram linkage that moves them forwardly and downwardly for operation, or which retracts the vibrators inwardly and upwardly relative to the frame. When the vibrators are retracted, the are withdrawn upwardly from the concrete and retracted rearwardly towards the machine front to reduce machine dimensions. Substantial retraction of the vibrators prevents subsequent interference with the rebar below. Vibrator retraction reduces overall machine dimensions for clearance and shipping purposes, with gang vibration arrays nested upwardly and inwardly proximate the front of the machine.

A longitudinal groove forming instrument 11 is provided on a base plate bottom face of a screed 7, 8. The longitudinal groove forming instrument 11 comprises a plurality of beam members 12. The beam members 12 are disposed in parallel with the direction of travel of the screed as the axial direction. A longitudinal groove 20 is formed by the beam members 12 pressing into a leveled face when leveling a pavement face and moving in the direction of travel for leveling while the beam members are being pressed down.

Provided is longitudinal groove forming technology that is easy to execute. A longitudinal groove forming instrument 11 is provided on a base plate bottom face of a screed 7, 8. The longitudinal groove forming instrument 11 comprises a plurality of beam members 12. The beam members 12 are disposed in parallel with the direction of travel of the screed as the axial direction. A longitudinal groove 20 is formed by the beam members 12 pressing into a leveled face when leveling a pavement face and moving in the direction of travel for leveling while the beam members are being pressed down.