| 摘要 |
PROBLEM TO BE SOLVED: To decrease man-hours of construction, efficiently shorten a period of execution, realize a low cost, and improve safety and reliability by lightly and smoothly installing rails when the move for PC concrete installation of a small main beam bridge is performed with a movable form. SOLUTION: A steel pipe 4' is provided between an upper flange 3 of a main beam 2 and a rail beam seat grider 5 installed on a H-steel 6 wherein a rail 1 is installed so as to exist in installed concrete 27 through a paper circular form 14. When the steel pipe receives a compressive action of a load of the concrete 27, an angular moment is treated by giving a compressive load beforehand to the steel pipe by an anchor bolt 15 interposed in the steel pipe so that the steel pipe can be resisted. The concrete is continuously installed by installing rails in a raw. When the rails are removed after executing, the anchor bolt is extracted from the concrete, the steel pipe is smoothly pulled out through the circular form, and the circular form is also easily removed. Accordingly, the rails are smoothly removed.
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