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Geomechanics and Engineering
  Volume 32, Number 5, March10 2023 , pages 503-512

Mechanized tunnels lining prefabricated segments production methods
Elaheh Banihashemigargari and Amir H. Rezaeifarei

    In tunneling projects, a significant part of the costs is spent on segment production. By more economically producing, the cost of tunnel construction can be greatly reduced, especially in long and large-diameter tunnels. In the present study, the effect of using the Carousel method in the improvement of the production system performance compared to the conventional Static system has been studied. To carry out the research, a quantitative comparison of cost and production time was carried out for two production methods using the available documentation. The opinions of experts have been obtained using questionnaires and qualitative comparison of cost, time and production quality was done by implementation of statistical analysis. The SPSS software and the univariate t-test were used to analyze the questionnaires. According to the results of statistical analysis with SPSS, the use of the Carousel method will reduce production time and costs along with increasing manufacturing quality. According to the documentation analysis, the Carousel method reduces the cost of production by almost 30% and leads to a reduction of the production time to approximately 40% of the Static moulds system. The Carousel method has a higher production rate, efficiency, and better performance. Research into quantifying the benefits of Carousel method in the production system performance is very limited. This comparison is based on real information from the under construction Tabriz Metro project. This article can be very helpful in choosing the best production method.
Key Words
    carousel method; cost and quality; prefabricated segments; production time, statistical analysis; Tabriz Metro
Elaheh Banihashemigargari: Master of Industrial management, Tabriz, Iran
Amir H. Rezaeifarei: Department of Civil Engineering, Azarbaijan Shahid Madani University, Tabriz,35 km. of Maragheh Hwy, Iran

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