Civil Engineering

Some of Epsilon Optics earliest projects were for Civil Engineering applications. Since then we have worked with a number of prominent civil engineering companies and in particular with Tobishima Corporation, our strategic partner in Japan. Together we have provided fibre-optic sensors and monitoring systems for a wide variety of Civil Engineering applications throughout Japan and South Korea.

Applications worldwide have included:

Tunnel Monitoring Bridge Monitoring Dams
Tunnels: monitoring the lining and invert for deformation and crack monitoring Bridges: crack monitoring, Shrinkage during concrete cure, deformation and movement Dams: ground movement, Shrinkage during concrete cure
Civil Engineering Civil Engineering Railway Tracks
LNG storage facility: foundations monitoring, ground movement & leak detection Cut slopes and embankments: Land-slip and ground movement Railway: variation in gauge width and ground movement. Rail deformation under train loading.
Key Features

Civil Engineering

  • Monitoring crack movement.
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  • Detection of land-slip and ground movement.
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  • Measurement of structural movement and deformation.
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  • Monitoring load and load distribution in piles and foundations.
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  • Monitoring tension in cables and ground anchors.
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  • Data management, visualisation and integration.
 
Bridge Monitoring

Epsilon Optics have been involved in a number of high-profile bridge monitoring projects in both new and ageing bridges. The TDM interrogator is ideally suited to large structures such as bridges. It can potentially address up to 100 sensors along a single cable, and with the 8-channel option can address up to 800 sensors. Sensors can be provided for measuring, surface strain, displacement, structural deformation, ground movement and crack monitoring. Typically the sensors are attached to the structure either by surface bonding, bolting, or by direct embedment in concrete/grout/shotcrete etc. The ability of the system to address hundreds of sensors from a single interrogator unit and minimal number of cables drastically reduces the installation costs both in terms of time and cabling infrastructure. Epsilon Optics can also offer a number of options regarding data management, visualisation and integration of the data into central data acquisition and monitoring systems.

Click here for more information on system integration

Key Features

Bridge Monitoring:

  • Bespoke monitoring solutions
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  • Up to 100 sensors in a single cable
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  • Shaped sensors to optimise monitoring of displacement, movement crack growth
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  • Ruggedized cabling systems
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  • Immune to electrical interference
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  • Data management, visualisation and integration

Hanshin Expressway Project

Hanshin Expressway Bridge

Much of the Hanshin Expressway around Kobe Japan have been in operation since the 1960s and are now in the process of refurbishment. Our partner Tobishima Corporation has developed a new, semi-automated technique for removal and replacement of the reinforced concrete slabs that form the road deck. The technique greatly reduces the duration of road closure by allowing removal and replacement of the road deck in large sections at a time. Before removing sections of road deck, concrete is removed by water jet where the deck interfaces the supporting steel beams. This preparatory work is carried out with the Expressway still in operation and therefore detailed structural monitoring is required to ensure the continuing safety and integrity of the structure throughout the process. The use of optical strain sensing, in this case, meant that many points along the supporting beams could be monitored simultaneously providing complete load profiles of each beam. The 8 channel interrogator system provided by Epsilon Optics enabled over 100 points to be measured at a frequency of 38 Hz. Tobishima advised that the final deciding factor for choosing TDM optical sensing for this project, was the cost when compared to the same number of conventional electrical strain gauges.

 
Rail Monitoring

TeCIP Railway Project

 

 

The TeCIP Institute in Pisa, Italy, have undertaken a project which required monitoring over 900m rail track. The objective was to investigate deformation of the rails as trains passed over them. This was successfully achieved using two TDM 4 Channel OEM1040-S-422 interrogators and 8 sensor arrays with a total of 634 sensors.

Piza Rail monitoring
Design and implementation of complete fibre optic sensing solutions