| 摘要 |
PROBLEM TO BE SOLVED: To provide a concrete form to which the pins for forming through-holes can simply, easily be set in a mass in the forming of concrete having the through-holes such as rain water pits and which can prevent formation of concrete lump apt to be formed in a gap occurred in the tip of pin. SOLUTION: In this concrete form, a coil spring 4 is provided so that one end thereof is inserted and fixed in the pin 3 and the other end is projected therefrom, and an outer frame 1 is provided with a cylindrical body 5 which can insert the coil spring 4 projected from the pin 3 and fix the coil spring 4 in such a state that it has a biasing force to pull the pin 3 toward the inner face 1a of the outer frame 1. Further, when the outer and inner frames 1 and 2 are set, the tip 3a of the pin 3 is brought into close contact with the inner face 2a of the inner frame 2. COPYRIGHT: (C)2005,JPO&NCIPI
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