This invention provides a method and device for nondestructive testing of an anchor bolt. Said method and device make it possible to quantitatively test the soundness of an anchor bolt affixed to a foundation via an adhesive anchor. In this method for nondestructive testing of an anchor bolt, in which the soundness of an anchor bolt affixed to a foundation via an adhesive anchor is tested, a section of the anchor bolt that is exposed from the surface of the foundation is hit so as to produce an impact noise, a signal waveform corresponding to said impact noise is received and subjected to frequency analysis so as to obtain frequency information for said signal waveform, and the soundness of the anchor bolt is nondestructively, quantitatively tested on the basis of said frequency information.

A method for evaluating installation of blind rivets including measuring the “cycle time” represented “y.sub.0”, transmitting sound waves through the blind rivet installed in the structure, measuring the “travel time” represented “x.sub.0”, relating “travel time” and “cycle time”, and obtaining a pair of times (x.sub.0,y.sub.0), providing a time relation pattern establishing a borderline between an area of suitable rivets and an area of unsuitable rivets, the border represented y=f(x), so for cycle time values greater than y=f(x), it is considered a “suitable area”, for cycle time values less than y=f(x), it is considered an “unsuitable area”, representing pair (x.sub.0,y.sub.0) in the graphic representation and verifying if the value of y.sub.0 is greater or less than the value of y=f(x0), classifying installation of the rivet as suitable or unsuitable according to the verification.

A portable inspecting device includes PZT transducers and performs active sensing to measure the characteristics of bolted connections. The PZT transducers are mounted on opposing ends of spring-loaded rods and can be moved apart to accommodate a structure for testing. The springs cause the PZT transducers to push against opposing parts of the structure in a stable but temporary fashion. The device can be physically moved to inspect the status and health of multiple different bolted connections.

A device and a system monitor wear of wearable components mounted in a mining equipment. An elongated bolt maintains a wearable component in place on a face of the equipment. A threaded section of the bolt terminates at a proximal end protruding externally through a hole of the equipment. A shank of the bolt terminates at a distal end opposite from the proximal end. The shank extends along a thickness of the wearable component and wears as the wearable component wears when the equipment is in operation. A transducer coupled to the proximal end of the bolt generates a sound wave within the bolt, detects an echo of the sound wave reflected by the distal end of the bolt, and reports to a controller a time delay between the sound wave and the echo. The controller evaluates a wear of the wearable component based on the time delay.

A dual channel nondestructive testing method for a rock bolt and related devices includes: determining a target phase difference and an instantaneous phase difference of the first received signal and the second received signal; determining an integral instantaneous phase difference between the first received signal and the second received signal based on the target phase difference and an instantaneous phase difference; determining a length of the exposed section of the rock bolt, a length of the rock bolt and a position of a grouting defect based on the integral instantaneous phase difference, a first velocity of the acoustic signal propagating in an exposed section of the rock bolt and a second velocity of the acoustic signal propagating in an anchor section of the rock bolt.

A clamping element comprises a clamping body, such as a screw, having an ultrasound sensor fixed to the head. The sensor transmits and collects ultrasound that propagates along the shaft of the screw between two flat and parallel base surfaces, to measure a physical quantity connected to the clamping force that acts on the screw. A cap-shaped cover element can be removably affixed to the screw head and houses a wired or wireless communication module, a controller, power supply means, and possibly additional sensors. A memory can be stably fixed to the ultrasound sensor to store screw-characteristic data. A monitoring system can collect and process the data of all the clamping elements with a single processor.

A tester for evaluating pullout load capacity and bond quality of anchor bolts embedded in concrete includes a Schmidt hammer for measuring a rebound number and an ultrasonic pulse velocity tester for measuring the transit time of a pulse transmitted through concrete surrounding an anchor bolt. The rebound number and the transit time are combined and matched against a database record which identifies the pullout load capacity and the bond quality. The transit time is matched to thresholds of transit times associated with porosity, internal cracking, air voids, and water pockets located around the embedded anchor bolt. The Schmidt hammer is further modified by the incorporation of a digital level for measuring the vertical and horizontal angles of inclination of the plunger with the concrete surface, a guide tube for supporting the plunger, and by using a convex plunger tip for improved registration with anchor bolt head.

A tester for evaluating pullout load capacity and bond quality of anchor bolts embedded in concrete includes a Schmidt hammer for measuring a rebound number and an ultrasonic pulse velocity tester for measuring the transit time of a pulse transmitted through concrete surrounding an anchor bolt. The rebound number and the transit time are combined and matched against a database record which identifies the pullout load capacity and the bond quality. The transit time is matched to thresholds of transit times associated with porosity, internal cracking, air voids, and water pockets located around the embedded anchor bolt. The Schmidt hammer is further modified by the incorporation of a digital level for measuring the vertical and horizontal angles of inclination of the plunger with the concrete surface, a guide tube for supporting the plunger, and by using a convex plunger tip for improved registration with anchor bolt head.

According to one embodiment, an inspection apparatus determines an object to be in a first state when an intensity at a first frequency of a frequency characteristic is not less than a first threshold, and determines the object to be in a second state when the intensity at the first frequency is less than the first threshold. The frequency characteristic is generated based on a vibration of the object when the object is struck. The second state is different from the first state.

A fastener probe assembly includes a disc configured to rotate about a first axis of a fastener, an ultrasound probe coupled to the disc, and an encoder configured to determine an orientation of the ultrasound probe relative to the first axis of the fastener during an inspection of the fastener. The ultrasound probe is configured to interface with an axial end of the fastener, to emit ultrasound signals into the axial end of the fastener, and to receive ultrasound signals from the fastener.