| 摘要 |
The present invention relates to a crack prevention ring for the buried part of an electric wiring box for preventing the crack of a structure caused by burying an electric wiring box in a ceiling slab of a reinforced concrete structure and, more specifically, to a crack prevention ring for the buried part of an electric wiring box including a separate crack prevention ring. The crack prevention ring can perform standardization with an uniform quality resulting from being made of a synthetic resin for injection molding by adhering to the upper surface of the bottom mold by using a lower wire mesh in a state where the electric wiring box is placed; can be economical because of low production costs and simple production; can be reasonable because of simple installation, secure fixation, and functioning as a spacer of the lower steel wire around the electric wiring box; can prevent water leakage and efflorescence due to the crack around the electric wiring box by basically preventing the crack of the circumference of the electric wiring box by efficiently dispersing and offsetting stress concentrated on the circumference of the electric wiring box. |
