| 摘要 |
PROBLEM TO BE SOLVED: To provide a bent and a timbering which facilitate ascending onto/descending from a work floor and are high in safety for a worker, and whose units vertically stacked one after another can be easily and surely connected together.SOLUTION: A bent includes: a frame whose outline is a quadrangular prism shape; a work floor which is inside the frame and provided in a substantially one half size in the lateral width direction of a height-direction central part of an inside hollow part in the frame; an opening provided on the lateral side of the work floor; a lower staircase which is below the work floor and is arranged with approximately front or rear half the length in the lengthwise direction of the opening; and an upper staircase which is above the work floor and is arranged with approximately rear or front half the length in the lengthwise direction of the opening. In the lower staircase, a tread of the lowermost stage is arranged on the lower part of the frame and a tread of the uppermost stage is arranged at the height of the work floor. In the upper staircase, a tread of the lowermost stage is arranged at the height of the work floor and a tread of the uppermost stage is arranged on the approximately upper part of the frame. |
