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The steel pipe strut method replaces the existing method using H beams as earth retaining structures in large-scale deep excavation carried out for the construction of railway, subway, underground road. Steel pipes have an excellent cross section function that changes the overall retaining structure, allowing the characteristics of the existing method to be maintained while improving convenience. The larger scale of the retaining structure accounts for 6.76% of Korea’s GDP. As such, if the method is applied nationwide in public construction projects, significant economic benefits are expected.