PURPOSE:To shorten the period of construction, secure the safeness of operations, and raise the efficiency of operations by a method in which base arch frames are manufactured with good accuracy in factory as prefabricating units, and the units are fabricated on site. CONSTITUTION:Base arch frames, each of which consists of a back steel frame 1 and main stirrups 2, are manufactured as transportable(on land) prefabricating units 50 - 58 by using steel tubes for structure, which have a high stiffness. The units 50 - 58 are fabricated finally on site only at the joint positions 61 - 66 of the units 50 - 58. Also, at single tube trusses 3 fabricated on site, the heads of columns are connected to given positions of the base arch frames 1 and 2, and the column bases are connected to the foundation. Since even only the central base is sufficient for scaffolds, the manhour for assembling work for scaffolds can thus by greatly reduced, and also since height operations such as height measurement of truss passage and positional regulation, etc., can be reduced, the safety security and efficiency enhancement of operations can greatly be increased.
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