Hiroaki Nagaoka

Process Model of Design and Construction Activities of a Building

This article presents a new method to represent the design and construction process in a systematic way and to develop a support system of management for concurrent engineering. We define activities included in the total process of a standard project, make an adjacency matrix about the relationship among activities, and structure the activities with a reachability matrix. As a result, the process consisting of several complicated interactions among activities was found. These interactions can be classified into three patterns. We constructed a new process model by dividing the information flow into nine categories. Moreover, the effectiveness of the model as a tool for concurrent engineering is discussed from four points of view, and the rellationship between concurrent engineering and project objectives is analyzed. This article shows the results matrix calculation first and then describes its contribution to concurrent engineering.

DEVELOPMENT OF A NEW STEEL PIPE PILE FOUNDATION CONSTRUCTED BY SOIL-CEMENT MIXTURE METHOD

新形式の鋼管杭の開発を行った. 地中にソイルセメント柱を構築し, その中に柱径より小さい径の鋼管を挿入する. 鋼管表面にリブを設け, これにより鋼管とソイルセメントの一体性を確保し, 地盤支持力をソイルセメント柱の外周面および柱先端面積で評価する事を可能にしている. また, 廃土量が従来工法に比べて格段に少ない事も特徴の一つとしている.