Precision rod type convergence gauge

Abstract

A precision rod type convergence gauge comprises anchor heads which are respectively fixed at two ends of a measured distance, a universal hook and a tubular connecting rod; the precision rod type convergence gauge also comprises a micrometer caliper, wherein one end of the micrometer caliper is connected with an extracting-pulling type distance-measuring gauge and the other end is connected with a pull rod benchmark device which consists of a telescopic rod fixed with the micrometer caliper into a whole, a force-measuring spring guide sleeve matched with the telescopic rod and a limit spring. The connecting part of the force-measuring spring guide sleeve and the micrometer caliper is provided with a benchmark window marked with a benchmark line; the ends of the pull rod benchmark device and the extracting-pulling type distance-measuring gauge can be respectively connected with a plurality of sections of tubular connecting rods by threads; and an alignment line which can be aligned to the benchmark line of the benchmark window is arranged on the telescopic rod. The precision rod type convergence gauge is applicable to the stability monitoring of military caves, railway tunnels, bridges, underground hydraulic buildings and mine tunnel chambers, and the deformation observation of earth structures. The precision rod type convergence gauge has the advantages of the structure convenient for observation, high precision, combination of a plurality of sections of measurement rod and strong adaptability.

Description

technical field [0001] The invention relates to a measuring instrument, in particular to a rod-type extensometer suitable for monitoring the stability of military caverns, railway tunnels, bridges, hydraulic underground structures, mine roadway chambers, and observing the deformation of geotechnical structures. Background technique [0002] The application of convergent gauges has been in use for many years, and many experts, scholars, and engineers and technicians have done a lot of fruitful work to explore the practicability and reliability of convergent gauges. Aiming at avoiding the decrease of the actual loading value caused by the elastic deformation of the tape, the patent No. 99115008.2 discloses a self-locking rocker-type extensometer. Although this rocker-type extensometer can perform measurement, it is difficult to read and the accuracy is not good. The defects of high and poor measurement effect; in order to reduce the fine-tuning amount of the convergent gauge a...

AI Technical Summary

Problems solved by technology

Aiming at avoiding the decrease of the actual loading value caused by the elastic deformation of the tape, the patent No. 99115008.2 discloses a self-locking rocker-type extensometer. Although this rocker-type extensometer can perform measurement, it is difficult to read and the accuracy is not good. High and poor measurement results; in order to reduce the amount of fine-tuning of the convergence meter and improve the measurement speed of the convergence meter, the patent No. 92229266.3 discloses a telescopic digital display convergence meter to improve the measurement accuracy, but its adaptability is not strong It is not ideal to use in large-section roadways, and the stability is poor; the patent No. 200520017066.8 discloses a tension and micrometer full digital display convergent gauge that integrates control and measurement. The accuracy is improved, but the overall reliability is not strong. It is easy to be damaged when used in the harsh environment of the roadway, and cannot effectively solve the problem of accurate and stable measurement.

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