| 摘要 |
PURPOSE:To obtain a concrete product having excellent surface of natural stones, by piling up natural stones in two layers or more on the inner face of a palette in a form, filling sand particles in gaps of the stones, spraying thereon water, tightening and hardening a hard-kneaded concrete on these stones, then aging it and taking it out from the form. CONSTITUTION:A box-shaped palette 1 where stones 2 and 3 and sand particles 4 are filled and water is sprayed is placed in a form 20 and a specific amt. of concrete is therein fed. The concrete is tightened and hardened by applying vibration of a vibrator 6 and lowering a press plate 22 to mold a block. Just after the molding, the block is taken out from the form and the palette 1 is removed after aging. Stones 3 of the upper layer where water was fed on its surface and stones 2 of the lower layer are divided at the line C-C and a block B on whose surface natural stones 3 are exposed can be obtained. Stones constituted of natural stones in the block B exhibit durability and natural appearance, have no water absorbing property and do not break when being frozen.
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