| 摘要 |
PURPOSE: A prefabricated block is provided to increase upward and downward coherence of the prefabricated block by fitting an extension part on a recess part. CONSTITUTION: A bonding groove(11) and a protrusion(12) are respectively formed on a prefabricated block. The prefabricated block comprises a main block(10) and an auxiliary block(20). An extension part(13) is formed on one side of the bonding groove or the protrusion. A concave part(14) corresponding to the main block is formed on the extension part. A secondary concave part(24) corresponding to the auxiliary block is formed ob the extension part. |
