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A Study on Automatic Calculation of Earth-volume Using 3D Model of B-Rep Solid Structure

B-Rep Solid 구조의 3차원 모델을 이용한 토공량 자동 산정에 관한 연구

  • Kim, Jong Nam (Dept. of Civil Engineering, Korea National University of Transportation) ;
  • Um, Dae Yong (Dept. of Civil Engineering, Korea National University of Transportation)
  • Received : 2022.09.20
  • Accepted : 2022.10.06
  • Published : 2022.10.31

Abstract

As the 4th industrial revolution is in full swing and next-generation ICT(Information & Communications Technology) convergence technology is being developed, various smart construction technologies are being rapidly introduced in the construction field to respond to technological changes. In particular, since the earth-volume calculation process for site design accounts for a large part of the design cost at the construction site, related researches are being actively conducted to improve the efficiency of the process and accurately calculate the earth-volume. The purpose of this study is to present a method for quickly constructing the topography of a construction site in 3D and efficiently calculating earth-volume using the results. For this purpose, the construction site was constructed as a 3D realistic model using large-scale aerial photos obtained from UAV(Unmanned Aerial Vehicle). At this time, since the constructed 3D realistic model has a surface model structure in which volume calculation is impossible, the structure was converted into a 3D solid model to enable volume calculation. And we devised a methodology to calculate earth-volume based on CAD(Computer-Aided Design and Drafting) using the converted solid model. Automatically calculating earth-volume from the solid model by applying the method. As a result, It was possible to confirm a relative deviation of 1.52% from the calculated earth-volume from the existing survey results. In addition, as a result of comparative analysis of the process time required for each method, it was confirmed that the time required is reduced of 60%. The technique presented in this study is expected to be utilized as a technology for smart construction management, such as periodic site monitoring throughout the entire construction process, as well as cost reduction for earth-volume calculation.

최근 4차 산업혁명이 본격화되고 차세대 ICT 융합 기술이 개발됨에 따라 건설분야 역시 기술변화에 대응하기 위해 다양한 스마트 건설기술이 건설 단계별로 빠르게 도입되고 있다. 특히, 건설현장의 경우 부지설계를 위한 토공량 산출 공정이 설계비용에 큰 부분을 차지하고 있어 공정의 효율화와 정확한 토공량 산출을 위한 관련 연구가 활발히 진행되고 있다. 본 연구는 건설현장의 지형을 3차원으로 신속하게 구축하고 이를 이용하여 효율적으로 토공량을 산출할 수 있는 방법을 제시하고자 한 것이다. 이를 위해 무인비행체로부터 획득한 대축척의 항공사진을 이용하여 건설현장을 3차원 실사모델로 구축하였다. 이때, 구축한 3차원 실사모델은 체적 산출이 불가한 surface 모델 구조를 가짐에 따라 체적 산출이 가능하도록 3차원의 solid 모델로 구조 변환을 수행하였다. 그리고 변환된 solid 모델을 이용하여 CAD 기반으로 토공량을 산출할 수 있는 방법론을 구상하였다. 정립한 방법론을 적용한 solid 모델로부터 토공량을 자동 산출한 결과, 기존의 현황측량 결과로부터 산출한 토공량과 1.52%의 상대적 편차를 확인할 수 있었다. 추가적으로 방법별 공정 소요시간을 비교분석한 결과 60%의 소요시간 절감을 확인할 수 있었다. 이로부터 본 연구에서 제시한 기법은 토공량 산출을 위한 비용절감은 물론 건설공사 전 공정에서 주기적인 현장의 모니터링 등 스마트 건설관리를 위한 기술로써 활용이 기대된다.

Keywords

References

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