| 摘要 |
According to the method of the invention, a device provided with a rotating, essentially horizontal roller 4 is advanced across the concrete surface, the said roller extending at right angles to the direction of movement P of the device. The roller 4 is brought into contact with the underlying surface at the same time as it is being rotated in such a way that its peripheral speed at the contact point between roller and concrete surface has a component of velocity which is directed in the direction of movement P of the device. <IMAGE> |
