| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To highly accurately and inexpensively form a knockout hole of a work box, without expanding an unnecessary hole of a wall, at knockout work at a construction site. <P>SOLUTION: A punched solid member 14 is supported by forms 16 and 17 in a wall 12 part of the work box 10 made of concrete, that is, in a position to be punched as the knockout hole for inserting a cable. Concrete is filled in the forms in this state, and the punched solid member is embedded and solidified, to form a knockout part K. Simultaneously when molding the work box by the forms, for example, a wall material and a separate solid constituent object made different in a molding period, a construction material, and a molding method, are arranged and supported by the forms, to thereby provide the knockout part of the work box for easily and efficiently maintaining pressure-proof performance and reducing labor, and the work box having this knockout part. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
