| 摘要 |
PROBLEM TO BE SOLVED: To provide a driving device for use during a process of introducing ready-mixed concrete into a form without making lound noises that are caused when vibrations are imparted by a table vabrator, without reducing air content in a concrete product so much and having a smooth surface. SOLUTION: A form 1 into which ready-mixed concrete is introduced is horizontally reciprocated while oscillating vertically by a driving device 2. At this time, the ready-mixed concrete 7 introduced into the form 1 is swayed to wave inside the form 1. When it waves, the introduced ready-mixed concrete 7 adheres to inner wall surfaces 1a, 1b of the form 1 that appear and disappear while the concrete waves to thereby form a mortar layer. A concrete product covered with the mortar layer thus produced has less bubbles appearing on the surface thereof, whereby a smooth surface can be provided. |
