Rod type convergence gauge and using method thereof

Abstract

The invention discloses a rod type convergence gauge and a using method of the rod type convergence gauge. The rod type convergence gauge is mainly formed by connecting a light metal measuring rod, a main measuring and reading rod, a fixing anchor head, a measuring point fixing anchor head and the like. The light metal measuring rod and the main measuring and reading rod are seamlessly connected in a butted mode through a connecting bolt and a connecting nut, and the main measuring and reading rod is mainly composed of a hollow rod body, an internal hidden steel measuring tape, a spring, a metal pressing rod, a locking device, a micrometer caliper, a force measuring spring and a reference window. After the components of the convergence gauge are connected, the measuring tape hidden in the main measuring and reading rod is drawn out, the internal hidden spring is pressed in the process of drawing out the measuring tape, the convergence gauge is tensioned at the same time, then, a measuring tape locking ring is screwed down, and a rough read number is recorded; next, the micrometer caliper connected to one end of the main measuring and reading rod is rotated and meanwhile the force measuring spring is pressed, when the scale mark on a guide rod of the force measuring spring coincides with the scale mark on the reference window arranged on the measuring rod, it is shown that the tensile force is regulated to be accurate, the mantissa is accurately measured and read, and the measuring value can be obtained by adding the mantissa to the rough read number. The rod type convergence gauge has the advantages of being simple in structure, convenient to operate, high and stable in measuring accuracy and high in applicability.

Description

technical field [0001] The invention relates to a rod-type extensometer and its use method, belonging to measuring instruments, especially suitable for monitoring the force deformation and stability of surrounding rock in underground engineering, and can be used in mining, construction, water conservancy, transportation, military and other departments. (Tunnel) and chamber applications. Background technique [0002] Due to the convenience of carrying, accurate measurement and reading, the relatively complex structure of the instrument, and the requirements of engineering applications, the research on the extensometer has a history of several decades. At present, the vast majority of the main body of the extensometer is still the traditional steel ruler. When the extensometer is measured and read, the reader part uses the combination of the positioning pin and the punching hole of the steel ruler to tension the extensometer and perform the first reading. . Among them, the p...

AI Technical Summary

Problems solved by technology

Due to the relatively harsh environment of the underground project, the steel ruler is prone to rust, breakage, and blurred scales, which reduces the durability of the instrument and makes maintenance difficult.

Existing extensometers are more convenient to use in lanes (tunnels) or chambers for measurement, but it is very difficult to connect the extensometer to the high point in the high and low level measurement. The use of metal rod-type extensometers can effectively solve this problem

Aiming at avoiding the decrease of the actual loading value caused by the elastic deformation of the scale belt, the patent No. 99115008.2 discloses a self-locking crank-type convergent gauge, but it has the defects of difficult reading and low precision; for reducing the fine-tuning amount of the convergent gauge , to improve the measurement speed of the convergent meter, the patent No. 92229266.3 discloses a telescopic digital display convergent meter, which is not ideal for use in large-section roadways, showing the problem of poor adaptability; the patent No. 200520017066.8 discloses a collection Tension and micrometry all-in-one digital display convergent gauges that integrate control and measurement. Although the measurement accuracy is improved, digital display convergent gauges are not easy to be popularized and applied, especially in the monitoring of coal mine roadways and deep underground roadways. Electronic convergent gauges require explosion protection. Affected by engineering environments such as humidity, electromagnetic waves, and geomagnetism, the digital display readings drift and cannot be accurate

Although the above typical convergent meters have achieved good results in certain engineering environments, they have different defects and cannot effectively solve the problems of accurate measurement, long-term use and strong applicability.

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