Placing after doing the temporary column, digging the land in junction manner and the junction structural

摘要

PROBLEM TO BE SOLVED: To improve accuracy in erection of main steels by a method wherein permanent sub-structural columns are erected first, being separate from erection of the main steels, and the main steels are joined at the construction site after the permanent sub-structural columns are fixed. SOLUTION: A reinforcing bar basket 18 is inserted into a pile hole 17 b, a permanent sub-structural column 11 is hung down with a hanging jig 19 onto a positioning trestle 20 c, the lower end of the permanent sub-structural column 11 is inserted into the reinforcing bar basket 18 d, and concrete 22 is cast into the pile hole 17 e. After the lower end of the permanent sub-structural column 11 is fixed, the hanging jig 19 is removed from the permanent sub-structural column 11 and the upper end of the permanent sub-structural column 11 is made to project in a specified height with the ground GL excavated f. A position-adjustable base plate 23 is attached to the upper end of the permanent sub-structural column 11 with the excavated surface E serving as a working base. A main steel 14 is hung down above the permanent sub-structural column 11 g, and an attachment plate 25 is temporarily fixed to the base plate 23 with temporary fixing bolts 26 and weld nuts 26a h. Welding is made around the base plate 23 and the attachment plate 25 i, and the temporary fixing bolts 26 are removed.