Patent ID: 6990782

Claim:
A method for assembling a low building from thin and lightweight shaped-steel members, said method comprising: providing two thin and lightweight shaped-steel members to be joined together by a joint between a flange, a web or a gusset at a preselected joint location; providing at least one joint hole at the joint location in at least one of the flange, the web or the gusset to be joined together; providing concave/convex portions respectively at the joint location in each of the flange, the web or the gusset to be joined together; holding a joint drill screw so that a conical surface of a tip end of the joint drill screw or a screw side wall of the joint drill screw is brought into contact with the at least one joint hole provided at the joint location in at least one of the flange, the web or the gusset to be joined together; and then driving the joint drill screw into the at least one joint hole.