| 摘要 |
PROBLEM TO BE SOLVED: To lessen the kinds of forms by a method wherein at least an outer form for a connecting part for forming the outer peripheral surface of the connecting part of a top board and a side board of a partly square and circular culvert, out of forms, is made a separate body and a plurality of outer forms for the connecting part which are different in a curvature are prepared. SOLUTION: Forms are assembled mutually by fixing them by fixing means 7 such as bolt fixtures or clamping members and, after a partly square and circular culvert is formed, they are disassembled by removing the fixing means 7. While forms 2a and 2b for bottom boards and forms 3a and 3b for side boards are also made to be separate bodies and of an assembling type, in this constitution, at least an outer form 4a for a connecting part to be used for forming the outer peripheral surface of the connecting part of a top board and a side board of the partly square and circular culvert, in an assembled form 1, is made a separate body. Moreover, a plurality of outer forms 4a for the connecting parts which are different in a curvature are prepared. The outer forms 4a are selected so that the thickness of the connecting part of the top board and the side board of the culvert to be formed be formed in accordance with the purpose of the use, and the desired culvert is formed by assembling the form 1.
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