UAV + SURVEYING
ContextCapture and drone photogrammetry of the quarry generated accurate reality meshes of the 40-hectare site.
Accommodating soaring population growth Reality modeling drives efficient design and management of Anderson Road Quarry. By Chintana Herrin
methods for the 40-hectare quarry site would have been inaccurate and inefficient because the quarry’s terrain was steep, sloping, and immense. Additionally, using manual photography to monitor progress would put surveyors at risk, capture only a portion of the area, and take 40 days to complete, missing the required 30-day reporting deadline. “Based on the complex nature of the project, its variety of infrastructure, and large-scale site formation, we have selected a comprehensive and appropriate package of Bentley solutions to help manage the project more efficiently,” said Ivan H.K. Tsang, vice president at AECOMAsia. To overcome the challenges of the site’s topography within the client’s 30-day reporting timeframe, AECOM decided to use reality modeling to best monitor the site’s progress. Using drone photogrammetry, the team captured 3,000 photos monthly and used ContextCapture to generate a reality mesh of the entire site for an accurate visualization of the construction progress within one day. The 3D precise and real-textured reality mesh provided the team with an efficient and comprehensive platform to oversee site progress and eliminated the need to have onsite staff perform the survey, avoiding potential hazards and improving safety. Extending the scope of reality modeling Beyond creating visualizations, AECOM understood that reality modeling provides a comprehensive record of a site’s current conditions that can be utilized in the future. Leveraging Bentley BIM methodology and reality modeling capabilities, AECOM partnered with Earth Solutions to implement a Site Data Management Solution (SDMS), using ContextCapture as the foundation. This construction management system extended the function of reality meshes from visualizations to more informative uses to achieve a full 4D BIM methodology approach.
To support the surge in economic development and population, Hong Kong has invested in numerous large-scale infrastructure works and new building structures. For more than 50 years, Anderson Road Quarry supplied aggregate, asphalt, stone, and concrete for construction programs in Hong Kong. Now a vacated site, Hong Kong’s Civil Engineering and Development Department (CEDD) has initiated a US$1 billion project to develop the quarry in response to the acute housing shortage, the result of rapid population growth. The quarry site offers 40 hectares of land to construct approximately 9,400 private and subsidized housing flats to accommodate a planned population of 25,000 people. AECOM was retained as the engineering consultant for sustainable infrastructure design, including site formation, road improvement works, pedestrian connectivity facilities, underground utilities, and housing estates. AECOM needed integrated BIM advancements and reality modeling technology to optimize planning and construction efficiency, streamline workflows, facilitate stakeholder communication, and meet client reporting requirements. Safe and accurate site monitoring As part of the project, AECOM was required to report to the client about the construction progress on a monthly basis. Traditional survey
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csengineermag.com
march 2018
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