A high-precision dam foundation grouting ground lift detection device

Abstract

The invention discloses a high-precision dam foundation grouting stratum lifting detection device. The high-precision dam foundation grouting stratum lifting detection device is composed of two solenoid differential micro-displacement sensors, a double-detection shockproof safety base and a stratum lifting detection display and alarm system. In the device, each solenoid differential micro-displacement sensor is decomposed into two independent parts, namely a cylindrical coil main body and an armature, the upper solenoid differential displacement sensor is used for measuring the lifting displacement of stratum during grouting, and the lower solenoid differential displacement sensor is used for measuring the disturbance displacement of an upper metal positioning plate caused by environmentalfactors. The double-detection shockproof safety base is fixed to the cement ground through expansion screws; and a lifting recorder finishes processing, displaying and alarming of lifting displacement and disturbance displacement signals and the lifting recorder comprises a high-amplitude-stabilization excitation source, a phase-sensitive detector and a V / A conversion circuit, wherein the phase-sensitive detector is used for processing output signals of a sensor. The device can adapt to the severe environment of grouting engineering, is firm and durable, improves the stability and continuityof detection, remarkably reduces the failure 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 high-precision detection device specially designed for detecting micro-displacement (lift) of the irrigated strata in 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 groutin...

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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