| 摘要 |
PURPOSE: A mesa tunnel construction method using an upper line excavation method is provided to reduce construction cost, improve safety, and reduce construction period. CONSTITUTION: A mesa tunnel construction method using an upper line excavation method comprises following steps. In the excavation section which is divided into two or more upper and lower sections by a mesa shield construction method, excavation is enabled from the upper part of the excavation section to the lower part of the excavation section. After the excavation of the upper part, a support member(500) is coupled with the lower part of struts(200). The lower part of the excavation section is excavated by the mesa shield construction method.
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