| 摘要 |
PURPOSE:To improve the working property and safety by providing a working elevating frame supporting a movable scaffold so that it can be raised vertically along a guide frame. CONSTITUTION:After hardening of concrete within a mold 6, a valley side form 40 is lifted to move a movable scaffold 9 on the valley side toward a half-arch 46, and then fallen down and suspended by a blanket 26. Then, a mountain side form 49 is lifted to release the connection between a roller supporting fitting 27 and a guide rail 16, and thereafter, a working elevating frame 5 is lifted to connect the fitting 27 to the rail 16, whereby the frame 5 is fixed in a determined position. The lower part of the form 49 is then fixed to the upper part of a half-arch 46, and the reinforcing bar 68 of a newly constructed arch unit 47 is connected to the reinforcing bar buried in the half- arch 46, followed by lifting the form 40. Further, the form 40 is fixed to the upper part of the half-arch 46 and connected to the form 49, and after installation of a side mold thereto, the space with in the form is concreted. |
