| 摘要 |
PURPOSE:To markedly improve quality, a cost, and a term of works, by a method wherein a water permeable layer is formed on the bottom of a dock, longitudinal holes are provided above the layer to place levelling concrete, and a sheathing board is installed on the bottom of a structure to place concrete. CONSTITUTION:Gravel 2 is laid on a concrete bottom 1 of a dock to form a water permeable layer 3, and longitudinal holes 5 are provided above the surface thereof to fill the holes with the gravel 2. Sand is laid on the water permeable layer 3 to place concrete, and a sheathing board 9 of forms for a concrete box body 8 is placed thereon to place concrete 10. Thereafter, after water is poured, the water flows through gaps between the gravel 2 to a space above the concrete 7, and the concrete box body 8 is caused to float in a condition to have the sheathing board 9 at its lower part as pouring of the water is processed. This enables an increase in a depth of water, permits building of a large structure, prevents the occurrence of a lateral slip, and allows stable retaining of a position. |
