A ground lift detection device based on differential principle

Abstract

The invention relates to a dam foundation grouting stratum lifting detection device based on a differential principle. The device is composed of a solenoid differential micro-displacement sensor, a safety base and a stratum lifting detection system display and alarm part, and the solenoid differential micro-displacement sensor is decomposed into two independent components, i.e. a cylindrical coilmain body and an armature. The safety base is composed of a cement base semi-embedded into a grouting site, an upper metal positioning block, a lower metal positioning block and positioning screw holes for installing the armature, wherein the upper metal positioning block and the lower metal positioning block are assembled into a whole through three long screws. Processing, displaying and alarmingof lifting displacement signals are completed by a lifting recorder host, and the lifting recorder host comprises a phase-sensitive detector used for providing sine waves for a primary side coil of adifferential micro-displacement sensor to serve as a high-amplitude-stabilization excitation source and used for processing output signals of the sensor, a V / A conversion circuit and a lifting data displaying and alarming circuit. The device can adapt to the severe environment of grouting engineering, is firm and durable, improves the stability and continuity of detection, remarkably reduces thefailure rate of lifting detection, and is very high in resolution.

Description

technical field [0001] The invention belongs to the fields of water conservancy and hydropower engineering and foundation and foundation treatment engineering, in particular a detection device specially designed for detecting the micro-displacement (lift) of the irrigated formation in the grouting engineering. Background technique [0002] In the grouting project, the displacement of the grouted strata is an important parameter that must be detected in various specifications, and it is required that the cumulative displacement of the stratum for each grouting section should not exceed 2000 μm. At present, mechanical dial gauges and electronic dial gauges with grating or capacitive structures are mostly used on the grouting site. Mechanical dial gauges are difficult to read and almost always read intermittently. Grating-capacitive electronic dial gauges are all grid-type structures, which are easily damaged at the grouting site, and are not suitable for use on the grouting si...

AI Technical Summary

Problems solved by technology

In the actual grouting construction, the failure rate of lift detection caused by these external factors is high, making the lift detection useless

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