Geosense Vibrating Wire Jointmeter

The Vibrating Wire Jointmeter is used to monitor joints of mass concrete structures.

The instrument consists of two parts, a socket and the main body with a waterproof vibrating wire sensing gauge. During construction of the structure, the socket is secured to the form and embedded into a lift of the block to be constructed. After removal of the form and prior to concreting of the adjacent block, the gauge is screwed into the socket, set at the desired range and then embedded.

Opening and closing of the joint is then measured by the gauge, which is firmly anchored in both blocks. The instrument body includes universal joints on which the sensing element is mounted, accommodating a small degree of shear movement that might occur.

The vibrating wire jointmeter is a robust and accurate instrument with excellent long-term stability. It can be measured by vibrating wire portable readout units or a data logger if remote continuous monitoring of the joints is required. All measurements are compared to an initial datum reading, providing a history of magnitude and rate of movement at the joint.