FIELD: construction engineering; erection and repair of subterranean pipe lines. SUBSTANCE: bench marks and recording devices are mounted along axis of pipe line. Devices for determination of direction of motion of soil and measurement of its speed relative to pipe line are secured at the top of pile line and on its sides. Devices includes multiturn potentiometers located in housing; their axles are connected with flag indicator and impellers located in soil. Motion of soil relative to pipe line makes flag indicator and impellers and consequently axles of potentiometer turn; change in ohmic resistance is recorded by measuring unit. Amount of change in ohmic resistance is indicative of direction and speed of motion of soil. EFFECT: enhanced reliability of pipe line. 4 cl, 3 dwg
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