| 摘要 |
PROBLEM TO BE SOLVED: To provide a double ceiling substrate structure in which the structure is simple, the labor can be greatly saved in fitting and adjusting a joist receiver and a joist a ceiling space can be reduced in size, and an indoor space can be effectively used. SOLUTION: A joist receiver 5 is formed of a pair of two steel members 13A, 13B of substantially U-shaped section, and a slit-like groove 15 is formed in the middle thereof by arranging these steel members 13A, 13B of substantially U-shaped section in a back-to-back manner, and interposing a spacer between back side plates opposite to each other. A joist receiving piece 4 comprises a horizontal fixed seat plate part 10A with a through hole 10a formed therein, and a perpendicular insertion plate part 10B, a screw bolt 3 is passed through the through hole 10a in the fixed seat plate part 10A, and fixed by fixing and adjusting nuts 11, 12 threaded on both sides across this fixed seat plate part 10A, the insertion plate part 10B of the joist receiving piece 4 is inserted in the slit-like groove 15 of the joist receiving 5, and connected to each other by a screw 17 screwed from the outside. |
