CUED Publications database

Monitoring on the performance of temporary props using wireless strain sensing

Xu, XM and Fidler, PRA and Rodenas-Herraiz, D and Li, W and Kumar, V and Birks, J and Yan, J and Soga, K (2016) Monitoring on the performance of temporary props using wireless strain sensing. In: International Conference on Smart Infrastructure and Construction (ICSIC), 2016-6-27 to 2016-6-29, Robinson College, Cambridge pp. 203-208..

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Although temporary props have been extensively used in underground support systems, their actual performance is poorly understood, resulting in potentially conservative and over-engineered design. This paper presents the performance monitoring of 4 temporary props in an urban construction site using a newly developed wireless strain sensor node featuring a 24-bit ADC. For each prop, 6 strain gauges and 3 temperature sensors were directly attached onto the prop surface using super glue, and then connected to a wireless strain sensor node mounted in the middle span. Each sensor node transmitted both monitoring data and network diagnostic messages in near-real-Time over an IPv6-based (6LoWPAN) wireless mesh sensor network. The data were also stored locally at each node on a micro SD card. Extensive testing and calibration was undertaken in the laboratory to ensure that the system functioned as expected. The prop loads are presented without correction for temperature effects and compared with the design loads. The monitoring data reveal the development of loads in temporary props during excavation, the formation of the basement and the extraction of the props. The network performance characteristics in terms of message reception ratio and network topology evolution are also highlighted and discussed.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Divisions: Div D > Geotechnical and Environmental
Div D > Structures
Div B > Photonics
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:34
Last Modified: 27 Oct 2020 05:51
DOI: 10.1680/tfitsi.61279.203