In this study, distributed fibre optic sensing (DFOS) cables, embedded in a pile during concreting, are used to measure the changes in concrete curing temperature profile to infer concrete cover thick...
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Concrete Pile Optical Cable - PVProjekt Digital Infrastructure [PDF]
CSIC installed two fibre optic cables on the test pile, one for measuring strain and the other temperature. The two cables were installed side-by-side to enable the removal of any unrelated temperature effects.
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DFOS techniques use light transmitted through an optical fibre to enable measurements to be taken all along an embedded or surface-mounted
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Brillouin optical time domain reflectometry (BOTDR) was used to measure the concrete strain and temperature from these two cables respectively2. The two cables were installed as a pair, in U
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Recently distributed fiber optic sensing (DFOS) technologies provide a powerful tool for geotechnical monitoring by enabling distributed and automatic strain measurement along fiber optic (FO) cables.
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The small size of the fibre optic cables (Figure 1) reduces the space required for instrumentation within a pile. As a result, fibre optic instrumentation provides little impedance to concrete flow and maximises
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Two examples of distributed optical fibre sensing in piles are demonstrated using different installation techniques. In a load bearing pile, optical cables were attached along the reinforcing bars by equally
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This paper deals with the pile testing instrumenta-tion of cast-in-situ reinforced concrete piles, con-structed using bored or continuous flight auger (CFA) methods. We focus in particular on how
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“Distributed fiber optic sensors for monitoring reinforced concrete piles using Brillouin scattering”, in Proceedings of the European Workshop on Optical Fibre Sensors - EWOFS 2016.
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Comparing measurements of a concrete driven pile load using conventional strain gauges and fiber optic distributed sensing. Read more about Static Pile Loading Tests - continuous strain measurement
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Distributed fibre optic sensing (DFOS) presents several advantages over traditional point sensors, for measuring strain and temperature in civil and geotechnical infrastructure. DFOS techniques use light
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Continuous measurements for static pile load testing Large bored pile equipped with fiber-optic strain sensing cables Direct concrete embedding provides continuous
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One of the major applications of DFOS is for monitoring reinforced concrete piles and diaphragm walls (D-walls), both for construction testing and for
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Monitoring to assess the integrity of existing piles In this innovative technique, laser light is shone through the fibre optic cables to measure the strain along the entire length of the pile.
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In this paper we report on advances made in the installation and use of distributed fiber optic sensors to monitor reinforced concrete piles subjected to static load tests. Eight concrete test piles, at three
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This paper presents a case study of an Osterberg-cell test of a pile located at the Isle of Dogs in London, which was heavily instrumented with distributed optical-fibre sensors, strain gauges,
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Abstract A high spatial resolution distributed fibre optic sensing system for measuring strain and temperature was used to instrument fourteen single piles subjected to general subsidence. Thirteen
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Distributed fibre optic sensing for pile monitoring Traditionally strain gauges and extensometers have been used to monitor reinforced concrete piles. However, the information that they can provide is
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Several lessons were learnt from the application of distributed fibre optic sensors in piles, such as installation methods, influence of temperature, and performance of fibre optic cables.
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Commercially available strain-sensing fiber optic cables have been widely applied for monitoring deformation in reinforced concrete and geotechnical
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As shown in Fig. 1, the stress and deformation characteristics of a pile are measured using fiber optic (FO) cables laid on the pile body. The data acquisition subsystem obtains the distributed information
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This paper presents a fiber optic monitoring approach, which provides distributed strain profiles with a spatial resolution of up to 10 mm along driven
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Open-ended pre-stressed high-strength concrete (PHC) pipe piles are susceptible to progressive distortion and even failure in the vicinity of the pile toe during driving into stiff soil or rock
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Each VWSG has its own electrical cable which will have to withstand the concrete or grout pouring stage as well as the curing cycle. By the time the pile is ready for testing, a certain percentage of VWSG
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The integrity of cast-in-place foundation piles is a major concern in geotechnical engineering. In this study, distributed fibre optic sensing (DFOS)
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Nils Nöther and Massimo Facchini Abstract This paper gives an overview over industrial applications of distributed fiber-optic strain sensing in structural health monitoring, outlining both the benefits of the
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Distributed fibre optic sensing for pile monitoring Traditionally strain gauges and extensometers have been used to monitor reinforced concrete piles. However, the information that they can provide is
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Horizontal deformation is a key parameter in the structural assessment of concrete piles, especially in landslide cases. However, the existing
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In this study, distributed fibre optic sensing (DFOS) cables, embedded in a pile during concreting, are used to measure the changes in
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