HEALTH MONITORING USING PHOTOS AND STRAINS DETECTED BY SMALL IOT SENSORS INSTALLED ON AN ACTUAL BRIDGE

Abstract

 Inexpensive and compact IoT sensors were installed on an actual bridge and monitored. The bridge is a two-span continuous girder bridge with RC slabs and five steel main girders, and has been in service for 18 years. The IoT sensor uses a Raspberry Pi, a single-board computer. It has a camera and a range finder and can be connected to a network using a USB dongle, a data communication terminal. It can be remotely controlled via the network. The IoT sensor can be operated by generating electricity from solar panels, so it can be installed and operated by human power without using heavy machinery and without installing a power supply. This paper describes a plan for long-term measurement of cracks on the underside of RC slabs and the residual displacement of laminated rubber bearings using the IoT sensor. This paper reports the photos and strain results obtained during the first month of installation.