設計変更に対する鉄骨ファブリケータの意思決定の任組み

摘要

Design change orders during steel fabrication can have a tremendous negative impact on steel fabricators and general contractors mutually. Also, it is liable to take project delay and cost escalation. Such change orders are impossible to predict and it takes some time for the steel fabricator to understand the implications of changes made by the contractor and review the response scope and method properly. Additionally, steel fabricator's staffs are usually in charge of both structural steel production and responding to change orders at the same time. Therefore, it is necessary to develop an effective and reasonable decision making framework to respond design change orders and to minimize negative effects. This paper introduces a decision making framework, developed based on ISO9000 for design change orders in a large-scale steel fabrication shop, including detailed production organization and their production works. In addition, in order to review effective methods to reduce decision making time and make decisions more rationally, we discuss an improvement method and those effects of the decision making framework as using a meeting system, attended sub-managers from departments/teams in the steel fabricator.%建築プロジェクトにおける鉄骨工事は建築物の躯体を構成する重要な工事であり、多様な生産主体の協力に基づいて行われるため、その生産過程は複雑なものとなっている。そのため、鉄骨工事に設計変更のような突発的な問題が発生した場合、伝達?入手された関連情報の再検討などに一定以上の手間と時間がかかり、他工事との業務調整や対応策の立案が困難となる場合が多い。