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  Development of the New Propulsion Method for Construction of a Small Section Underground Structure While Cutting the Ground

  This study proposes a new construction method for constructing a small section structure under railway tracks by non-open cut method.This method has the following 3 characteristics; 1) Ground surface displacement is reduced by a ground cutting wire saw in front of the cutting edge. 2) Attitude control jacks between the cutting edge and precast concrete boxes achieves detailed excavation control. 3) Vertical shaft space is minimized by a dividable structure of the cutting edge. We conducted an excavating test to prove the efficiency and feasibility of this method and each characteristic. As a result of the test, we confirmed this method was effective for actual construction.

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