King’s Cross Station Redevelopment, London

Beth, Martin; Macklin, Steve; Nichols, Z

doi:10.1201/9781439833483.ch96

Cited by 4 publications

(3 citation statements)

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“…where 1 and 2 are the vertical displacements and 1 and 2 are the rotations at the two ends of the rod section, respectively, E is the Young's modulus, I is the second moment of area of the Smart Rod, and the remaining symbols are as defined in Equation (2). Traditionally in structural analysis, the four displacements would be known and then Equation ( 3) can be directly used to determine the end moments.…”

Section: Discussionmentioning

confidence: 99%

“…There are a few existing monitoring systems, which, although considered reliable, require access to the tunnel outside of passenger traffic hours and thus only provide measurements during a limited time of the day and under non-operational conditions. Remote monitoring systems are currently available based on electrolevels (e.g., the Bassett convergence system [1]) and automatic motorized theodolites [2], although the theodolite system requires a large clearance for its installation and is therefore often restricted to use in stations or larger diameter road or rail tunnels. While the existing measuring systems are very good at measuring specific displacements of the tunnel (i.e., convergence or rotation), the new system reported herein has the potential to measure a number of different parameters with one unique system.…”

Section: Introductionmentioning

confidence: 99%

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An Optical Fiber Sensor System for Remote Displacement Monitoring of Structures — Prototype Tests in the Laboratory

Metje

Chapman

Rogers

et al. 2008

Structural Health Monitoring

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This study describes a new optical fiber monitoring system to measure structural displacements. The underlying concept is based on a square fiberglass `Smart Rod' containing grooves in each face, glued into which are optical fibers containing fiber Bragg gratings (FBGs) at a succession of points along their length. The Smart Rod is rigidly fiXed at discrete points to the structure being assessed and the strain at each FBG is determined optically. The strain is thereafter converted to structural displacements. This study describes a series of `bench test' laboratory eXperiments designed to eXplore the challenges of installing the monitoring system and interpreting the results. The results from the tests are presented and discussed in the conteXt of the accuracy achievable with the proposed system. The tests have shown that the Smart Rod is sensitive enough to measure rotational movements of 0.5° and lateral movements of 0.1 mm of the fiXings in the laboratory. Recommendations are consequently made for a practical instrumentation system based upon the Smart Rod. An eXample is provided showing the Smart Rod installed in a road tunnel to monitor displacements of the tunnel lining.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Optical Fiber Sensor System for Remote Displacement Monitoring of Structures — Prototype Tests in the Laboratory

Metje

Chapman

Rogers

et al. 2008

Structural Health Monitoring

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show abstract

“…Some successfully accomplished projects using automated monitoring systems have already been reported, for example monitoring of the structures above the King's Cross station during the construction of the tunnel connections [12]. The accuracy of angle measurements of the total station TCRP 1201R300 is ±1” according to the technical data of the instrument, while the accuracy of measuring distances to standard optical prism is ±(2 mm + 2 ppm) and positioniong accuracy of the ATR is below ±2 mm [13].…”

Section: Scheme Of the Experiments And Equipmentmentioning

confidence: 99%

Use of Automatic Target Recognition System for the Displacement Measurements in a Small Diameter Tunnel Ahead of the Face of the Motorway Tunnel During Excavation

Klopčič

Ambrožič

Marjetič

et al. 2008

Sensors

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During construction of the Šentvid tunnel a unique opportunity arose to measure the 3D displacements ahead of the motorway tunnel excavation face, since the exploratory tunnel was already constructed in the axis of the main tunnel. According to reviewed literature such measurements had not been performed yet and several problems regarding equipment and complete scheme of the experiment needed to be overcome. The paper gives a brief description of the Šentvid tunnel project, presents significant factors that affected the choice of the geodetic equipment and describes the scheme of the experiment. A special attention is focused on the problems relating to the operation of the instrument in demanding environmental conditions (water, dust).

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King's Cross underground station, London: geotechnical aspects

Macklin¹,

Yeow²

2004

Transport

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King’s Cross Station Redevelopment, London

Cited by 4 publications

References 0 publications

An Optical Fiber Sensor System for Remote Displacement Monitoring of Structures — Prototype Tests in the Laboratory

An Optical Fiber Sensor System for Remote Displacement Monitoring of Structures — Prototype Tests in the Laboratory

Use of Automatic Target Recognition System for the Displacement Measurements in a Small Diameter Tunnel Ahead of the Face of the Motorway Tunnel During Excavation

King's Cross underground station, London: geotechnical aspects

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