WORKFLOWS FOR CONDITION INSPECTION DOCUMENTATION OF ARCHITECTURAL HERITAGE BASED ON HBIM: TAKING THREE DUTY ROOMS IN FORBIDDEN CITY OF BEIJING AS AN EXAMPLE

Abstract. This paper explores the BIM-based route map and workflows for documentation of condition inspection for architectural heritage, exemplified by an on-going conservation project of three Duty Rooms in Yangxin Hall complex in the Forbidden City, Beijing. Since intensive, multi-disciplinary inspection work for architectural heritage will result in huge amount and categories of data and information, the 2D-based traditional way of documentation is abandoned, while HBIM was introduced for information management and presentation. In respond to multi-disciplinary collaboration, a duel-route workflow is specially developed for the combination of BIM and non-BIM teams, in which the BIM team is responsible for BIM models’ creation and maintenance, and for information management and presentation, while the non-BIM team carry out the survey and inspection in their own established way without any requirements for BIM skills, making a little adjustment where necessary, with interactive models as links between them. The practice following the workflows mentioned in this paper proves that condition inspection based on HBIM is applicable, compatible and flexible, providing the possibility to improve the traceability and sustainability of heritage information, and to generate visualized, thematic and integrated presentation in high efficiency and consistency. This paper also provides some solutions to the specific problems encountered during actual operation. For example，the defects keynote dictionary offers a sound tie between the BIM team and non-BIM team, and between site survey and final presentation; the application of shadow elements helps to improve the information management between whole and parts, ideal and actual, 2D and 3D.