SUBSIDENCE MEASURING APPARATUS FOR PIPE BURIED UNDER GROUND

摘要

PURPOSE:To facilitate the measurement of a value and the direction of a horizontal displacement and the value of a vertical displacement at the position of the displacement from the ground surface even when a pipe buried under the ground moves laterally or longitudinally. CONSTITUTION:The lower end of a detection rod 3 is linked to the upper part of a conduit 1 at a universal joint part 30 free to tilt and the upper end thereof is supported by a spherical bearing part 50 provided at the center part of a disc-shaped spacer 49 which is made free to slide vertically within the upper end part of a protective cylinder 11. An inclinometer comprising an X level gauge and a Y level gauge arranged orthogonal to each other is set at the tip of the detection rod 3. A value of a horizontal shift of the conduit 1 is obtained by a vector sum of outputs of the X level gauge and the Y level gauge and the direction of the shift is calculated as the direction of the vector sum. A vertical shift at the position of the displacement of the conduit 1 is obtained by the value of the vertical displacement.