| 摘要 |
PURPOSE:To make easier the centring of a top-shaped concrete block during installation by a method in which the axial leg of a ]-shaped concrete block is driven into a given position, and a block body detachable from the axial leg is attached to the axial leg. CONSTITUTION:In a U-shaped concrete block 1 to be used as a cobble stone for foundations, the block 1 consists of a U-shaped block body 2 and a detach able axial leg 4. The leg 4 is driven into a given position, and then the straight hole 10 of the block body 2 is fitted with the stepped axis 11 of the leg 4 to set the block body 2. The centering of the leg 4 during driving period can be exactly made, and the installing accuracy of the U-shaped concrete block 1 can be raised. |
