| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method for a concrete block for manufacturing with good productivity the recessed and projected patterns on its surface and also provide a manufacturing device thereof. SOLUTION: A form with a through-hole formed in the up and down direction is provided with a structure in which the interval of an inner face 231 facing a partition 230 is widened downward and a number of recesses and projections 232 and 233 are formed at least on a part of the inner face 231, and a supporting plate is disposed on the bottom face of the form, and a concrete material is filled in the form, and a plunger is inserted from an upper opening of the form to pressurize the concrete material in the form and mold the same, and the supporting plate is lowered and a molded block 600 is drawn out of the form to manufacture the concrete block having a number of random recesses and projections on its surface and provided with the outer appearance of natural hand.
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