Device capable of enhancing reflection signals at bottom end of anchor rod and detection method adopting device

Abstract

The invention provides a device which is capable of enhancing reflection signals at the bottom end of an anchor rod and used for a nondestructive testing method of the anchor rod in the field of nondestructive testing of engineering equipment, and a corresponding method for enhancing the reflection signals at the bottom end of the anchor rod. The device adopts a three-layer structure, namely, an outermost layer, a second layer and an innermost layer, and is specifically composed of a cylindrical casing, a connecting section, a cavity section, a reflecting arc, a fixing bolt and the like, wherein the cylindrical casing as the outermost layer of the device makes contact with the wall of an anchor hole and mortar; the connection section and the fixing bolt are in contact with an anchor rod body for fixing the device on the anchor rod body; the cavity section and the reflecting arc are used for enabling incident signals to be reflected strongly. The method for enhancing the reflection signals at the bottom end of the anchor rod comprises the step of fixing the device at the bottom end of the anchor rod. On the basis of the characteristic that the larger the difference of environmental wave impedance between the anchor rod body and the bottom end is, the higher reflection energy is, the incident signals can be subjected to maximum reflection at the bottom end of the anchor rod body by the device, and accordingly, the purpose of enhancing the reflection signals at the bottom end of the anchor rod during nondestructive testing is achieved.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing of engineering equipment, and in particular relates to a device capable of enhancing the reflection signal at the bottom end of a bolt in the non-destructive testing of a bolt and a detection method using the device, thereby reducing the difficulty of analyzing data of the bolt detection and improving the quality of the bolt. The accuracy and precision of non-destructive testing methods, so as to more objectively and accurately evaluate the anchorage quality status of bolts. Background technique [0002] Bolt support is widely used in water conservancy and hydropower, mines, highways and railways and other tunnels and slope geotechnical engineering. The judgment and evaluation of bolt support engineering quality need to be realized through bolt non-destructive testing technology. [0003] The non-destructive testing technology of bolts is a commonly used quality inspection method ...

AI Technical Summary

Problems solved by technology

When the reflected energy at the bottom of the bolt is small, it is difficult to identify the received reflection signal at the bottom of the bolt, and it is impossible to make an accurate evaluation of the anchoring quality of the detected bolt.

[0004] During the inspection of bolt support quality, when the bottom end of the bolt body is well cemented with the mortar, the difference in wave impedance between the bolt and the mortar is small, and strong reflections are difficult to occur, resulting in weak or even ineffective signals that can be analyzed. The identified situation is often encountered. In this case, it is difficult for the inspector to make an accurate evaluation of the anchorage quality of the inspected bolt.

In previous studies, the research on such problems has focused on how to extract effective reflection signals from weak reflection signals. However, this method is time-consuming and laborious, and the accuracy is also low.

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