Advancements in marine-based ground stabilization: the Koukaku and construction management systems in CDM

The CDM (Cement Deep Mixing Method) is a method of consolidating soft ground by mixing a stabilizing material, such as cement slurry, with the subsoil. In Japan, it has been widely used in the port sector, mainly with special working vessels. It is applied to the foundation soils of breakwaters, quays, and revetments. Our deep mixing vessel "Koukaku" can improve up to 5.47 m2 per cycle and 52 m below sea level, which is more than three times the capacity of land-based soil improvement machines (improvement area of 1.5 m2 and application depth of 45 m). In recent years, there has been a need for productivity improvement of the entire construction production system through the full implementation of ICT (Information and Communication Technology). Therefore, we have developed an automated construction system and a 3D construction management system using "Koukaku" and implemented them on site. In this paper, we describe the results of Koukaku's ground improvement work, including stabilizing quality through automated construction, achieving worker training and early independence, the real-time 3D construction management system, and the automated creation of forms and BIM/CIM (Building/Construction Information Modelling) models.