Strain Gauge Transducers for Load Monitoring Applications 

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Established in 1966, Encardio-rite is a world leader in providing instrumentation monitoring services globally, for large Civil Construction Projects. With most of the instrumentation, including the dataloggers and software developed and produced in-house, Encardio-rite has an edge over the competition which work with instrumentation and software sourced from others. We have the most innovative range of civil engineering and geotechnical monitoring instruments. We have been associated with every major construction project like LA Metro, Paris Metro, Dubai Metro (Red and Green lines), Expolink Route 2020, Marina Bay Sands, CERN to name a few.

Encardio-rite is entrusted with the implementation of the instrumentation & monitoring design for risk management on a turn-key basis in large-scale civil engineering projects. Scope of works included supply, installation, monitoring and reporting of geotechnical instruments like inclinometers, piezometers, standpipes, pressure cells, surface settlement points, multi-point borehole extensometers, load cells, tilt meter, crack meter, prism targets, etc.

Encardio-rite produces, installs and monitors a wide range of strain gage transducers as well. These play a vital role in the safety monitoring of deep excavations, tunnels, cross country pipelines, structures, such as dams, bridges, high-rise buildings, underpasses, historical monuments etc. These transducers in conjunction with other geotechnical instruments are effective risk mitigation tools. Any impending failure is detected in advance from the data collected from these transducers giving sufficient time to implement suitable corrective measures. Thus, chances of avoiding any accident, cost of which both in financial terms and loss of lives could be enormous, greatly increase.

In one of the deep execution monitoring projects in the Middle East, Encardio-rite’s arc-weldable type strain gage transducers (see picture above) based on vibrating wire technology were used for monitoring load in the pipe struts (see picture on the right). The pipe struts were installed within the excavation for supporting the diaphragm and secant pile walls. Normally, these tend to cave into the excavation due to the combined pressure of the surrounding soil and the sub-surface water acting on it.

Other instruments were also installed in the same project by Encardio-rite such as in-place inclinometers, vibrating wire piezometers, geodetic monitoring points etc.

As the excavation progressed, trend of the strain gage data started increasing in compression, implying an increasing load on the strut (refer to the load v/s time graph below). When the load values were compared with the anticipated load values for the same stage of excavation worked out during the design phase, it was found exceeding the same. The monitoring system generated an alarm upon detecting the above potentially dangerous condition to all concerned parties including the project stakeholders. The excavation was stopped immediately and corrective actions such as installing additional dewatering wells at the back side of the shoring system for pumping out groundwater which was exerting pressure on it and installing an additional level of struts as the excavation to the formation level was resumed.

The monitoring was carried out once every hour with the help of automatic dataloggers with in-built GSM modem. The latter enabled wireless data transfer through the cell phone network to the remote monitoring data server. The data was available 24×7 in near real time and could be viewed from any location using the on-line data management software.

Thus, the load measurement using the strain gage transducers played an important role in the risk management of the above deep excavation project.

A strong design team, extensive manufacturing and testing facilities, past experience and proven expertise allows Encardio-rite Group to take on challenging technological advancements, with cutting-edge software, instrumentation and monitoring techniques to address the dynamic requirements of the evolving construction monitoring sectors.

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