| 摘要 |
PURPOSE: A device for measuring the displacement of a tunnel inner hole is provided to control a carriage moving amount moving along a rack of a rail frame because a rotary extent of a rotary shaft of a motor can be measured by an encoder and a rotary extent of a pinion gear can be known. CONSTITUTION: A device for measuring the displacement of a tunnel inner hole comprises a rail frame(16), a carriage(18), a pair of camera(32), and a plurality of photography targets(30). The rail frame is installed in the inside of a tunnel along a cross-sectional line of the tunnel. The carriage moves along the rail frame. The pair of camera is joined to the carriage. The pair of camera photographs a cross section of the tunnel. The plurality of photography targets are set in the inner wall of the tunnel along the cross-sectional line of the tunnel. |
