| 摘要 |
PURPOSE: A tip structure of excavation method is provided to prevent damage by locating a tip structure on the lower part of a steel plate. CONSTITUTION: A tip structure(10) comprises following components. A body(11) has a predetermined shape. Multiple hydraulic jacks(17) are installed in the inside of the body. A pair of rollers(14) is installed in the fixed top position of the inner cylindrical surface of the body. A steel plate(15) is installed in a pair of rollers. The steel plate revolves to the inside and outside of the body. |
