| 摘要 |
PROBLEM TO BE SOLVED: To enable the protection of a concrete top end from being damaged by a sheet by installing devices for securing a clearance between the top end of a cylindrical concrete form and the sheet. SOLUTION: When a clearance device is not used, the top end of a cylindrical concrete form is damaged by the contact with a sheet to need repairing, etc. Therefore, devices for keeping a clearance are attached to the sheet and the form respectively so as to keep a clearance between the top end of the form and the sheet to prevent damage due to the contact between them. |
