| 摘要 |
There is disclosed herein an elongated member disposed transversely of a lane of newly poured concrete and dragged forwardly lengthwise of the lane while in such transverse position, the elongated member having a multiplicity of closely spaced, parallel, flexible rods projecting rearwardly at a slight downward angle and pressing resiliently into the plastic concrete and progressively forming slots therein, the elongated member also having adjustable counterweights projecting above the rods and sustaining a downward pressure on the rods.
|
