Center-cut half elliptical The system of blasting the half elliptical on the center cut for Tunnel.

摘要

PURPOSE: A half elliptical blasting method of center-cut is provided to minimize environmental pollution such as noise and vibration. CONSTITUTION: When blasting a full section of a tunnel or an upper half section, the half elliptical blasting method of center-cut comprises the steps of setting a half elliptical shape on the center part of a tunnel, boring holes horizontally at regular intervals, and boring and blasting for enlargement vertically in a half elliptical shape to control environment pollution of noise and vibration.