| 摘要 |
PURPOSE:To prevent production of a collar and to eliminate a chipping work, by a method wherein, in an inverted concreting method, a side form is arranged below an upper structure, and forms for after-concreting are inclibaly located in juxtaposition with the upper end of the side form. CONSTITUTION:In an inverted concreting method utilized in underground construction, a side form 2 for building a lower structure is arranged below an upper structure 1 built by before-concreting, and a form 7 for after-concreting is arranged in juxtaposition upwardly diagonally to the upper edge of the side form 2. In which case, a wire (b) is interposed in a hole (c) in the form 7, and the end is fastened to a column reinforcement 5. Concrete c' is placed below the upper structure 1 through a concreting port 6, and upon completion of concreting, the wire (b) is tightened up, and the concreting port 6 is closed with the form 7. This prevents formation of a collar in the vicinity of the concreting port, and eliminates a chipping work. |
