ABSTRACT
Most underground networks were installed using open trench construction methods. This construction method typically consists of placing pipes on bedding material and backfilling the trench. Presently, underground piping networks are accessed using closed circuit television cameras. While the camera goes through the pipe network a trained operator classifies the condition of the underground network by visually assessing the camera image projected onto a monitor. Over the past 10 years many technological improvements have been made to CCTV camera images including the development of new digital cameras. Regardless of the type of camera used the condition of the pipeline is evaluated solely on a pipe surface image. A research project is underway to determine if non-destructive ultrasonic test methods can be used to quantify the state of pipe cracking in concrete pipes. The goal of this research is to develop a test methodology that can add complementary information to pipe surface image assessments. This paper presents our preliminary research findings.
