Anchor rod length measuring method and anchor rod length measuring instrument

Abstract

The invention discloses an anchor rod length measuring method and an anchor rod length measuring instrument. The anchor rod length measuring method comprises the following steps: a transmitting module is used for generating a plurality of sinusoidal signals with different frequency values according to a set frequency interval and transmitting the sinusoidal signals to an anchor rod in sequence; each sinusoidal signal is transmitted from the starting end of the anchor rod and is reversely transmitted to the starting end of the anchor rod after being reflected at the tail end of the anchor rod, so that incident waves and reflecting waves at the starting end of the anchor rod can be superposed to form standing wave signals; a receiving module is used for receiving the standing wave signals at the starting end of the anchor rod in sequence; a control module is used for mapping voltage values and frequency values of all the standing wave signals onto a two-dimensional curve; the length measurement of the anchor rod is realized through finding out a frequency value corresponding to a first wave trough point of the two-dimensional curve. The anchor rod length measuring method and the anchor rod length measuring instrument have the benefits that measuring signals are electromagnetic waves, so that non-destructive detection can be realized; the anchor rod length measuring instrument has he advantages of great coupling convenience, wide length measurement scope, high measurement accuracy and the like.

Description

technical field [0001] The invention relates to the field of bolt length measurement, in particular to a bolt length measurement method and a bolt length measuring instrument. Background technique [0002] At present, the methods for measuring the length of bolts at home and abroad mainly include pull-out test method, impact stress wave method and ultrasonic method. The pullout test method mostly stays in the mechanical destructive pullout test stage with a jack, which will cause serious damage to the anchorage structure and reduce the reinforcement effect of the anchor rod on the surrounding rock, so only a small number of random inspections can be performed. The impact stress wave method detects the time of the wave reflected from the bottom of the bolt, combined with the consolidation wave velocity theory, to find the length of the bolt. There is a coupling problem between the vibration wave and the bolt, and the measurement results often vary from person to person. The ...

AI Technical Summary

Problems solved by technology

[0003] What the present invention aims to solve is the problem that the traditional measuring method cannot measure the length of a metal anchor more than 10m, and provides a method for measuring the length of a metal anchor and an anchor length measuring instrument capable of measuring the length of a metal anchor more than 10 meters

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