Research on Calculating Quantity of Utility Tunnel with Revit Secondary Development

A practical cost estimation about the design model of the utility tunnel is essential for the management of the utility tunnel in the design stage. However, the process for quantity calculation based on the design model from the utility tunnel is inefficient because of the inaccurate recognition. Issues in quantity calculation will be resolved with the method related to Revit secondary development (RSD) proposed in the paper. On the basis of Application Programming Interface (API), programming language C#, and programming platform Visual Studio, we established a tight correspondence between the design model of utility tunnel and the external database for quantity calculation. Consequently, results of the quantity calculation based on utility tunnel depended on the clarified model of utility tunnel were available. A case of utility tunnel in the new southern district of Nanjing was studied. It has shown that the results of RSD are better than that of the existing third-party calculation software, in terms of recognition accuracy and data integrity. The results of the study verified the reliability of method proposed in the paper.