| 摘要 |
PURPOSE:To prevent deterioration in the strength of concrete, by a method wherein, after upper layer concrete is placed on an underwater bedrock, concrete is placed through the under part of the upper concrete layer to increase an amount of the concrete. CONSTITUTION:After upper layer concrete 4, which is mixed with the admixture of a non-ionic high molecular material having clay of about 40cps. is charged through a charge port 31 to fill a tremie 3 therewith, the valve of a discharge port 32 is opened to cause the upper layer concrete 4 to quietly flow out onto bedrock 1. Thereafter, the tremie 3 is lifted up little by little, and the upper layer concrete 4 is placed in a given thickness in forms 2 in a condition that the upper surface of the upper layer concrete 4 is held horizontally as much as possible. After driving concrete 5 is charged through the charge port 31 to fill the tremie 3 therewith, the discharge port 32 is opened to cause the driving concrete 5 to flow out therethrough. |
