| 摘要 |
PROBLEM TO BE SOLVED: To widely use a scaffold by connecting support frames erected on the same circumference of a floor face at every nearly equal distance by extensible horizontal connection beams and putting scaffold boards on the connection beams. SOLUTION: Support frames 4 erected on the same circumference of a floor face at every nearly equal distance are mutually connected by connection beams 5, and an annular scaffold 1 is constituted of a scaffold frame 2 in which an intermediate frame 6 is supported between the frames 4 by the beams 5, and a scaffold board 3. The frame 4 is formed of the upper frame in which the lower end is formed by one leg and the top beam 71 for supporting scaffold boards 3 is fixed between the front ends bifurcated to form a Y-shape, a foundation, and a connection column whose connection number can be selected to form a required height. A thin pipe is extensibly inserted in a large pipe to make it possible to fix the beam 5 in a required length, and the adjacent upper frame is integrally formed with an external beam 5a, an internal beam 5b, and an intermediate beam 5c. Fan-shaped scaffold boards 3 having the same length are fixed to the frames 4, 6 by retaining claws. In this way, the annular scaffolds are made light-weight to integrally hoist them. The height and the diameter can be easily changed, and the scaffold can be efficiently assembled while using common materials.
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