| 摘要 |
PROBLEM TO BE SOLVED: To provide a ceiling substrate structure in which a square cylinder-shaped ceiling joist (that is, a square cylinder-shaped member) can be easily and directly mounted to a grape trellis structure in high working efficiency.SOLUTION: A ceiling substrate structure consists of a number of hollow first metal square cylinders 1 arranged in parallel at prescribed intervals and a number of second metal square cylinders 2 orthogonal to the metal square cylinders 1 and arranged in parallel at prescribed intervals, and is configured so that the first metal square cylinders 1 or the second metal square cylinders 2 are suspended from a structure 26 of a building by using suspension bolts 3. Insertion holes 1a, 2a penetrating through the first metal square cylinder 1 and the second metal square cylinder 2 respectively are formed in the first metal square cylinder 1 and the second metal square cylinder 2 respectively in advance. When connecting both the insertion holes 1a, 2a by a connection bolt 10 inserted into both the insertion holes to connect the first metal square cylinder 1 and the second metal square cylinder 2 to each other, the first metal square cylinder 1 and the second metal square cylinder 2 can be directly and firmly connected to each other only by inserting the connection bolt 10 into the insertion holes 1a, 2a formed in advance and penetrating through both the metal square cylinders. |
