| Popis: |
This chapter presents some opportunities that infrastructure computer vision (ICV) has provided for the subcontractors and fabricators. Subcontractors and fabricators need ICV to measure the progress of the work completed, to better understand and capture the status of the built environment, and to measure the quality of the fabricated components and modules. Using digital twins of the components and modules at the design phase and the construction phase, subcontractors and fabricators are capable of tracking the required information. ICV combined with some further technologies have opened some unprecedented opportunities to improve the fabrication, installation, and maintenance procedures. ICV is first investigated from the subcontractors' perspectives. Various perspectives for different trades including steel fabricators, formwork fabricators, reinforcing steel fabricators, etc., are discussed to better frame the ICV solutions for the subcontractors and fabricators. A brief summary on the state-of-the-art research and practice is also presented. It will then evaluate production monitoring at two different stages: (1) off-site production monitoring and (2) on-site production monitoring. Next, fabrication control methods and the existing technologies are then thoroughly discussed. Vision-based techniques and visual analytics for as-built status assessment and discrepancy quantification are then thoroughly discussed. Furthermore, a systematic realignment strategy for construction components is presented. Finally, a summary is provided to assess the vision-based approaches for geometric quality control and as-built status modeling in terms of accuracy and time-effectiveness. The potential of adopting the sensing technologies in subcontractors' and fabricators' practice is provided with the aim of replacing the current tape measurement practice. |
