Manufacturing method of steel pipes for joints, upper columns, formwork for forming upper columns and upper columns

摘要

PROBLEM TO BE SOLVED: To provide a form for forming an upper column capable of appropriately forming an upper column. SOLUTION: A tubular integrally molded portion 5 integrated with a concrete portion, a seat plate portion 6 having an outer diameter larger than that of the integrally molded portion 5, and a tubular fitting portion 7 fitted with a lower pillar. The present invention relates to an upper pillar forming mold 1 for manufacturing an upper pillar having the above. The upper column forming form 1 includes a tubular form main body 21 formed by assembling a plurality of form components 22a and 22b. The mold body 21 is provided at the first mold portion 23 on which the integrally molded portion 5 can be installed, and at one end of the first mold portion 23 in the axial direction, and is provided with the first mold. A flange portion 24 having an inner diameter larger than that of the portion 23 and a contact with the seat plate portion 6 and a fitting portion 7 extending from the flange portion 24 on one side in the axial direction and having an inner diameter larger than that of the first formwork portion 23 are installed inside. It has a possible second formwork portion 25. [Selection diagram] Fig. 1