Prevent Construction Errors with AR Visualization of Underground Buried Pipes! On-site Use Cases and Implementation Benefits

On construction sites, accidental contact with underground pipeline facilities is one of the most serious safety risks. Traditionally, work proceeded under very difficult and dangerous conditions, with workers holding paper drawings and trying to grasp the complex locations of buried pipes. However, with the development of AR (augmented reality) technology, it has become possible to visualize the positions of buried pipes in real time on site. This article provides a detailed explanation of the on-site use of buried pipe location information using AR display technology, covering its principles, specific usage methods, implementation examples, and effects of introduction. AR technology is expected to greatly improve safety and efficiency on construction sites. AR displays are becoming not just a convenient tool but an essential safety measure in modern construction sites. By using AR displays to utilize three-dimensional location information obtained from buried pipe scan surveys on site, occupational accidents can be dramatically reduced.

Basic Principles of AR Display Technology and Its Application to Buried Pipe Detection

AR (augmented reality) is a technology that overlays computer-generated virtual information onto images of the real world. By using the camera of a device such as a smartphone or tablet to capture a site, it can overlay the positions and shapes of underground buried pipelines onto that footage. This makes it possible to display underground buried pipes that are not visible from the surface as if they could be seen through the ground. In AR displays, three-dimensional models of buried pipelines obtained from scan surveys are mapped to the site's real-world coordinate system. This mapping ensures that, no matter which direction the device is pointed, the buried pipelines’ positions are displayed accurately.

Realizing AR display combines multiple technologies. First, buried-pipe scan surveys obtain three-dimensional coordinate information of underground buried pipes. Next, this three-dimensional coordinate information is transformed into the device’s coordinate system. In this process, high-precision GNSS positioning plays an important role. By utilizing high-precision GNSS positioning devices mounted on an iPhone, the device’s position can be determined to centimeter-level (inch-level) accuracy, and the relative relationship to the buried pipes can be calculated accurately. Furthermore, by using the device’s orientation sensor (magnetometer), the direction the device is facing can be determined, enabling accurate AR display. By coordinating multiple sensors, advanced three-dimensional visualization becomes possible.

In AR displays, buried pipes can be represented with different colors and shapes to visually distinguish between different types of buried pipes. For example, water pipes are often shown in blue, sewer pipes in brown, and gas pipes in yellow. This kind of visual distinction enables construction staff to instantly identify the target buried pipe within complex underground structures where multiple buried pipes intersect. In addition, depth information for buried pipes is also displayed, which serves as a reference when determining excavation depth. Color-coding standards are becoming internationally unified, and using the same display method across different regions makes it easier for staff to understand.

On-site Utilization Methods and Specific Work Procedures

The first step to utilizing AR display technology on-site is to import buried-pipe data obtained from scan surveys into AR-compatible civil engineering design software. At this stage, it is important that the data’s coordinate system transformations are performed accurately. It is assumed that data obtained from multiple survey instruments have been integrated into a unified coordinate system. If there are errors in the integration of the data’s coordinate systems, the positions of buried pipes displayed in AR will be incorrect, rendering on-site safety measures ineffective. Therefore, rigorous quality control during the data processing stage is essential.

The use of AR displays on site varies depending on the construction stage. In the design and construction planning stage, they are used for selecting routes that avoid buried pipes and for examining construction methods. Three-dimensional visualization makes the spatial arrangement of buried pipes more intuitive, enabling the formulation of safer and more efficient construction plans. In the detailed design stage, AR displays are used for the detailed setting of excavation routes, planning the placement of temporary structures, and determining cable routes. Early use of AR enables problems in subsequent processes to be detected and addressed in advance.

The use of AR during the construction phase is the most important. It is recommended to check the AR display on-site with a tablet or smartphone just before starting excavation work. Construction staff should film the site with a camera, confirm the buried pipes displayed on the footage, and give instructions to the excavator operator. Such real-time confirmation can almost certainly prevent contact accidents with buried pipes. During excavation, continuously check the AR display, and for buried pipes immediately in front of the excavator, implement safety measures such as switching to manual digging. The continuous verification process also speeds up responses when unexpected buried pipes are discovered.

Work that utilizes AR displays requires coordination among multiple staff members. The AR screen operator, the excavator operator, and the on-site safety manager must work closely together and maintain continuous communication. Clear division of roles and responsibilities among staff is a prerequisite for safe operations. It is also important that a unified understanding of how to read AR displays is established across all personnel. Regular training and communication improve the team's coordination accuracy.

Implementation Benefits and Challenges

On sites where AR display technology has been introduced, it has been reported that incidents involving contact with buried pipes have decreased significantly. Compared with the traditional reliance on paper drawings alone, research has also found that sites using AR displays see contact rates with buried pipes approach nearly zero. This improvement in safety not only prevents workplace accidents but also reduces construction delays and the costs associated with risk responses. Another important secondary effect is the alleviation of the psychological burden on construction staff. It creates an environment in which workers can concentrate on their tasks with confidence, without anxiety about buried pipes. The increased safety awareness also heightens vigilance toward other hazards.

The effects of introducing AR display technology are not limited to improving safety. It also improves construction efficiency. Time spent cross-checking with paper drawings is reduced, and on-site decision-making becomes faster. Because staff can more accurately determine the locations of buried pipes, changes to construction routes and adjustments to construction methods can be implemented more efficiently. As a result, construction periods may be shortened and construction costs reduced. AR display technology is not merely a safety tool but an important tool that contributes to the overall efficiency of construction. Considering the economic effects, investments in AR technology are often recouped in a short period.

There are several challenges in implementing AR display technology. First, it presupposes that scan surveys are of high quality. If the measurement accuracy of buried pipe locations is insufficient, the AR display will also be inaccurate. Therefore, strict quality control during the survey phase is important. Next, proficiency in operating AR-compatible software is required. Introducing new technology requires staff training and a period for them to become proficient. It is important to provide sufficient training in advance and to ensure that staff fully understand the technology before using it in actual field operations.

Also, the accuracy of high-precision GNSS positioning devices is important. The use of iPhone-mounted high-precision GNSS positioning devices, for example, allows a device’s position to be known at the centimeter level (half-inch accuracy), which determines the accuracy of AR displays. In environments where GPS signals are weak (for example, locations surrounded by tall buildings or indoors), GNSS positioning accuracy may decrease. In such environments, a combination of supplementary positioning technologies may be required.

Implementation Examples and Deployment Progress

Globally, cases of using AR display technology for buried-pipe detection are increasing. In many large-scale construction projects in developed countries, there is a trend to adopt AR displays as a standard safety tool. In particular, for construction in urban areas where multiple buried pipes are densely clustered, it is becoming difficult to perform safe work without AR displays. As safety standards for public works are tightened, instances in which the use of AR display technology becomes a condition for winning contracts are also increasing.

In Japan, major construction firms and public works contractors are advancing the adoption of AR display technology. Especially in urban underground construction and large-scale infrastructure projects, the use of AR technology has become commonplace. These implementation cases have demonstrated that AR display technology reliably improves safety and efficiency on-site.

Further development and wider adoption of AR display technology are expected in the future. Advances in the technology will make AR displays easier to use and more accurate. In addition, combining AR with AI technologies is enabling the development of systems that automatically detect hazards and alert workers. Such technological progress is expected to further reduce construction accidents related to buried pipelines. AR display technology is an important technology that will open up the future of safety management at construction sites. By utilizing iPhone-mounted GNSS high-precision positioning devices, the accuracy of AR displays will be further improved and their adoption at more sites will progress.

Use Cases and Examples of Industry Adoption

Buried-pipe scanning survey technology is being actively used in a wide range of civil engineering works nationwide. In projects with a high potential for interference with buried pipes—such as large-scale urban development projects, subway construction, road widening projects, and city gas pipeline installation—scanning surveys are essential. Through experience at these sites, scanning survey technology has demonstrated its reliability and effectiveness.

At both corporate and municipal levels, awareness of the importance of scan surveys is increasing, and there is a trend toward more substantial budgetary measures. This is because the benefits in both reducing the risk of construction accidents and improving construction efficiency have come to be recognized.

Technical Challenges and Solutions

There are several challenges with current buried-pipe scanning survey techniques. When soil electrical conductivity is high, electromagnetic waves attenuate rapidly, which is problematic. In such environments, this is addressed by using lower-frequency sensors or by combining multiple survey instruments.

Detection of deeply buried pipes is also a challenge. Conventional ground-penetrating radar finds it difficult to detect buried pipes at depths exceeding 10 m (32.8 ft). To address such challenges, the development of more advanced technologies is underway.

Standardization and Regulatory Environment

Standardization of buried-pipe scanning surveys is advancing, and unified guidelines for survey methods and report formats are being established. This is improving the comparability and reliability of survey results.

Regulations requiring the implementation of buried pipe surveys in public works are increasing, further heightening the importance of scan surveys within the legal framework.

Future Predictions and Research and Development Trends

The future of buried pipe scanning survey technology is very promising. The development of new sensor technologies, the use of AI, and the adoption of robotics will enable more efficient and higher-precision surveys.

The proliferation of iPhone-mounted high-precision GNSS positioning devices is expected to make field data acquisition even easier. Thanks to such technological advances, buried pipe scanning surveys will likely be conducted at an increasing number of sites. Scan survey technology is expected to play an important role in improving infrastructure safety across society.

Implementation and Operational Details

Implementing buried pipe scanning surveys in the field requires extensive, detailed planning. Various elements are involved, including survey scheduling, securing equipment, staffing, and safety management. Survey project management is critically important for ensuring smooth survey execution.

Before conducting a survey, social/environmental arrangements such as advance notification to surrounding residents, notification to the police, and coordination with relevant agencies are required. By properly carrying out these procedures, troubles at the site can be prevented.

The Importance of Operations and Maintenance

Effective use of data obtained from scan surveys requires an appropriate operations and maintenance framework. Building a management system that leverages IT technologies—such as regular database updates, version control, and access management—is required. Preventing data obsolescence and continuously maintaining up-to-date buried pipe information will, in the long term, contribute to providing value to society as a whole.

Organizational Structure and Human Resource Development

With the development of buried-pipe scanning survey technology, cultivating personnel with specialized knowledge and skills has become an urgent task. Many specialists are needed, including field technicians, data-processing experts, and project managers.

Enhancing educational programs at universities and vocational schools, improving in-company training systems, and introducing national qualification systems are important for strengthening human resource development frameworks. By cultivating the next generation of specialists, the technology for scanning and surveying buried pipes will become even more advanced.

International trends and comparison

Buried pipe scanning survey technology is attracting international attention. In developed countries, buried pipe surveys for public works are being standardized, and international harmonization of survey standards and report formats is progressing.

Even in developing countries, interest in buried pipe scanning surveys is rising alongside infrastructure development. International technical cooperation is expected to further accelerate the dissemination of scanning survey technologies.

Environmental Impact and Sustainability

Because buried pipe scanning surveys are non-destructive, they offer the advantage of minimal environmental impact. Compared with conventional excavation surveys, soil excavation, waste generation, and impacts on ecosystems are virtually zero.

From the perspective of sustainable infrastructure management, the use of scanning survey technologies is extremely important. Appropriate management of digitized buried pipe information will enable the efficient utilization of infrastructure assets across society.

Future Developments and Contribution to Society

Buried pipe scanning survey technology is widely expected to become an indispensable technology in everyday life. It is an important technology that contributes to solving many social issues, such as preventing construction accidents, improving infrastructure safety, and streamlining urban management.

By combining with new technologies, such as iPhone-mounted GNSS high-precision positioning devices, buried-pipe scanning surveys will become even more convenient and accurate. In the development of future social infrastructure, buried-pipe scanning survey technology will take on a central role.

Specialized Knowledge and Practical Skills

To effectively carry out buried pipe scanning surveys, advanced specialist knowledge and practical skills are indispensable. Knowledge from multiple disciplines such as geotechnical engineering, geophysics, surveying, and civil engineering is required. By mastering the fundamentals of each field and gaining practical on-site experience, true experts are cultivated.

Continuous education and training of survey staff are critically important for maintaining and improving the technical level throughout the organization. Regularly conducting training on new technologies and methodologies, and continuously supporting staff skill development, is the key to building a competitive survey capability.

Project Management and Quality Assurance

The success of an underground pipe scanning survey project can only be achieved through appropriate project management and a rigorous quality assurance system. Schedule management, budget management, risk management, quality management, and many other management items are involved. For each item, it is important to set quantitative targets and regularly monitor progress.

In a quality assurance system, quality checks should be conducted at every stage of the process, from the survey planning phase to the report preparation phase. Quality audits by external third parties also play an important role in ensuring the reliability of the survey results.

Adapting to the Latest Technological Trends

Buried pipe scanning survey technology is rapidly evolving. New sensor technologies, data processing algorithms, and visualization techniques are being developed one after another. Rapidly mastering and applying these latest technologies in the field is important from the perspective of maintaining competitiveness.

The application of AI technologies is advancing the automation of inspection processes, such as automatic detection of buried pipes and automated anomaly detection. By appropriately leveraging these cutting-edge technologies, inspection accuracy and efficiency can be further improved.

Social Responsibility and Ethics

Companies and organizations that carry out buried pipe scanning surveys have a social responsibility. Acquired buried pipe location information should be managed and utilized responsibly to ensure the safety of public infrastructure.

Appropriately addressing many issues, such as ethical concerns, information security, and personal information protection, is essential for gaining trust from society. A multifaceted response is required, including the formulation of corporate ethics regulations, ethics education for employees, and the establishment of an information security system.

Long-term Perspective and Strategic Planning

A long-term perspective is necessary for the development and widespread adoption of buried pipe scanning survey technologies. Rather than pursuing only short-term profits, it is important to formulate business strategies from the standpoint of contributing to the improvement of infrastructure safety for society as a whole.

Efforts that contribute to the development of the entire industry—such as investments in research and development, investments in human resource development, and participation in technological standardization—become sources of long-term corporate competitiveness.

Finally

Scanning survey technology for buried pipes is an indispensable technology for infrastructure management in modern society. It contributes to solving many social issues, such as preventing construction accidents, improving infrastructure safety, and streamlining urban management.

By combining new technologies such as iPhone-mounted GNSS high-precision positioning devices, buried pipe scanning surveys will further evolve. If all stakeholders engage with a mindset of contributing to the advancement of this important technology, it will lead to greater prosperity and safety for society as a whole.