| 摘要 |
PURPOSE:To obtain easily temporary yorks capable of closing up a slab hole by fixing temporary yorks of vinyl chloride on a slab pipe by screws. CONSTITUTION:(a) Temporary yorks 1, 2 of vinyl chloride are set to a slab pipe. (b) Screws 5 are penetrated through the holes of the temporary yorks 1, 2. (c) Thumb-screws 4 are clamped manually. The said york has a merit that holes on the slab can be closed up easily by these processes. Thus, though mortor is poured onto the slab, there is no fear of the morter carrying away and the finish of the slab is very good. |
