| 摘要 |
In a step for installing a lower-side columnar body, a first columnar main conductor (2), a second columnar sub-conductor (3), and a first columnar main conductor (1) are erected, and the first columnar main conductor (1) is disposed between the first columnar main conductor (2) and the second columnar sub-conductor (3). In a step for securing a U-shaped conductor, the upper-side end part of the first columnar sub-conductor (2) is caused to face one end of a U-shaped conductor (7) which is bent into a U-shape, the upper-side end part of the second sub-columnar conductor (3) is caused to face the other end of the U-shaped conductor (7), and the center portion of the U-shaped conductor (7) is secured to the distal portion of a second columnar main conductor (4). |
