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Abstract

Increasing urbanization and construction in recent years have led to growing demands for precast concrete products. The precast production process is still largely manual-intensive and time consuming, despite these high demands. Automation has the potential to make the precast concrete production process faster, more cost efficient, and safer. Although construction has not embraced automation to the degree of other industries, the prefabrication industry has seen numerous advances towards automation in the design, manufacturing, and quality assessment of precast concrete. However, many precast facilities in the United States have high output demands, older plants, and high levels of product variability that prevent them from fully automating their process. The purpose of this research is to assess the existing state of practice for automation within and outside of the prefabrication industry. In addition, this study analyzes the existing workflow of producing precast double tee products at an existing precast concrete facility located in the Southeast United States. A survey instrument is used to quantitatively evaluate how stakeholders at the precast facility value various outcomes of automation. The results of this survey are used to create a decision matrix, where various solutions for automated rebar tying are evaluated. Because most commercially available rebar tying equipment are not sufficient for three-dimensional operations, the research includes the creation of technical standards for developing a new automated rebar tying device. The automated process established in this study is mathematically modeled for its cost and time outcomes using electrical actuator parameters, constraints of similar technology on the market, and double tee geometry and mesh patterns. This quantitative analysis reveals that the new process would result in an 89% reduction in cycle time per double tee product. Qualitatively, the new automated process greatly decreases the risk of workers experiencing low-back disorders due to the prolonged nonneutral postures required for manually tying rebar.

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