Taisei Corporation (President: Yoshiro Aikawa) and Keisoku Giken Co., Ltd. (President: Yoshito Hashimura) have jointly developed 'Soil Scan,' a technology that automatically measures and visualizes the volume of excavated soil and sand at high speed and with high accuracy by linking multiple 3D-LiDAR units, a remote sensing technology that uses laser light, as part of 'DX in production processes.'

The application of this technology will enable labor-saving and efficiency improvements in the management of excavated soil volume, which was previously performed manually by employees.

In construction work involving excavation of soil, the excavated soil is first accumulated in a soil pit or other location in the work yard, and then transported offsite by dump truck. Especially when the work yard is narrow, it is important to grasp the accumulated soil volume and perform the removal work efficiently. Conventionally, employees manually measured the soil shape using a scale, and based on the survey results, they planned the allocation of dump trucks and managed the soil volume. However, this method places a large burden on employees in terms of time and physical burden, and the survey accuracy is not sufficient. In cases where the soil surface is undulating, it is difficult to grasp the soil volume accurately, and the number of dump trucks is often insufficient, resulting in reduced work efficiency and an issue in soil volume management at construction sites.

Therefore, we have developed a technology called 'Soil Scan' that automatically measures and visualizes the excavated soil volume accumulated in the work yard accurately and quickly by linking multiple 3D-LiDARs that can measure quickly and accurately using laser light, and by combining it with a soil volume management application. The performance and effectiveness of this system was also confirmed in the construction of a drainage pond at the Oji Water Supply Station (tentative name) in Tokyo (client: Tokyo Metropolitan Government Bureau of Waterworks; construction: Taisei, Iwata Chizaki, and Kandenko JV).

The features of this technology are as follows

High-speed, high-precision automatic measurement and visualization of accumulated soil volume is possible.By

combining 3D-LiDAR, which can accurately and quickly measure a wide area by irradiating laser light in a three-dimensional shape, with a soil volume management application, the volume of excavated soil accumulated in soil pits, etc. can be measured automatically at all times and output in a short time, which reduces the labor required for excavated soil volume management.In addition, the point cloud data acquired by measurement can be visualized in 3D color display, making it possible to visually grasp the accumulated excavated soil volume.

Multiple 3D-LiDARs can be linked to measure from multiple directions.

When measuring from one direction, retaining walls and piles of soil themselves can get in the way and result in areas that cannot be measured, but by linking multiple 3D-LiDARs placed around soil pits and other areas to measure from multiple directions, blind spots can be eliminated and unmeasured areas can be eliminated. The soil volume data acquired by each 3D-LiDAR is integrated in a way that prevents double counting of overlapping areas, and the excavated soil volume is quantified with a measurement error of less than 5%.

It is possible to grasp and manage excavated soil volume anytime, anywhere.By

linking this technology with 'T-iDigital Field 1 ,' a construction site construction management system developed in-house in 2020, it is possible to grasp and manage excavated soil volume in real time anytime, anywhere using a mobile device such as a smartphone.

Going forward, we will actively aim to apply and expand the application of this technology to all soil volume measurement work in construction projects involving earth excavation, regardless of whether they are in civil engineering or architectural fields, thereby promoting efforts to improve productivity at construction sites through the digitalization of production processes.

T-iDigital Field: Based on the concept of CPS (Cyber-Physical Systems), this integrated platform accumulates and integrates huge amounts of various video and sensor digital data obtained during construction in a virtual space, forming digital twins and providing feedback to construction workers as high-value-added information, while also deriving optimal solutions from the accumulated data through the use of AI and multivariate analysis, with the aim of supporting on-site management and improving productivity. The application of this technology will free construction workers from the hassle of on-site management, and the effective functioning of remote control and automation of construction work will create new added value such as further improvements in construction efficiency and safety, which is expected to lead to a significant change in conventional wisdom about the construction industry.

DX Certification is a system in which the government certifies companies that comply with the basic requirements of the Digital Governance Code, based on the Act on Promotion of Information Processing.

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