Vibrating Wire Joint Meter Manual
The RST Vibrating Wire Joint Meter monitors joints of mass concrete structures and provides accurate results with excellent long term stability.
The RST Vibrating Wire Joint Meter is developed 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 adjacent block, the gauge is screwed into the socket, set at the desired range, and then embedded into concrete.
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 RST Vibrating Wire Joint Meter is a very robust and accurate instrument with excellent long term stability. It can be measured by RST 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.
In addition to vibrating wire joint meters, RST offers vibrating wire crack meters that can be used for monitoring joints of both new and existing concrete dams and structures. Access to the joint or crack to be monitored is required.
|Ranges||25, 50, 100 mm|
|Overrange||1.25 X range|
|Accuracy||0.2% F.S. (0.1% F.S. optional)|
|Operating temp.||-20 to +80°C|
|Signal Cable -EL380004||Two twisted pairs cable with polyurethane jacket|
|Lengths||25 mm range: 369.6 mm
50 mm range: 435.4 mm
100 mm range: 573.3 mm
Vibrating Wire Joint Meters are commonly used for the monitoring of joints of concrete arch, gravity and buttress dams; concrete-faced, rockfill dams; concrete retaining walls and slabs.
View illustrations on how Vibrating Wire Joint Meters are used for:
I’m very happy with the quality of the instrumentation and technical support from RST, as always. They worked with us from the initial stages of the project to ensure that we were fully prepared and equipped to use the RSTAR network for the first time. They delivered everything within the tight project time frame to ensure that there were no delays on site, and the submersible tilt meters looked like new even after over twelve months of being submerged in Thames water!
-Richard Lipscombe, BEng (Hons), Director & Principle Consultant - RL Geotechnical Ltd