Flint and Neill Ltd

Flint and, United Kingdom

Flint and Neill Ltd

Flint and, United Kingdom

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Yeow H.-C.,Flint and Neill Ltd | Nicholson D.,Arup | Man C.-L.,Atkins | Ringer A.,Kier Engineering | And 2 more authors.
Proceedings of the Institution of Civil Engineers: Geotechnical Engineering | Year: 2014

Excavation of the western ticket hall box at Tottenham Court Road station represented a critical path activity of the Crossrail railway project in London, UK. Base slab construction and preparatory sprayed concrete lining works needed to be completed before the arrival of the two tunnel boring machines. A full observational method (OM) design was implemented to eliminate the lowest level of temporary propping, resulting in a 13 m prop-free excavation at the bottom of the 30 m deep diaphragm wall station box. This paper describes the design and successful implementation of the OM, which eliminated the need to fabricate, install and remove the fifth level of temporary propping. It covers the comprehensive review of the original design input parameters, back analysis of the most probable geotechnical design parameters and comparison of wall deflection and forces in the temporary props from early stages of the construction works. The robust strategy formulated as part of the observational method design to control the subsequent excavation is described: this included trigger criteria, a review process and predetermined contingency measures to ensure safe execution of the excavation works. A genuinely collaborative effort between client, permanent and temporary works designers, independent design checker and the contractor is elaborated. Cost and programme savings achieved by implementation of the observational method approach are outlined. © ICE Publishing: All rights reserved.

MacKenzie D.K.,Flint and Neill Ltd | Colford B.,Forth Estuary Transport Authority
Bridge Maintenance, Safety, Management, Resilience and Sustainability - Proceedings of the Sixth International Conference on Bridge Maintenance, Safety and Management | Year: 2012

The operation of major bridges provides a clear insight into some of the limitations within the design process, where the designers' emphasis on strength and stiffness often neglect important considerations of maintenance. Difficulties occur primarily with access and the replacement of components that do not have the same design life as the bridge, resulting in significant increases to operation costs and even the inability to carry out maintenance. Although modern design of cable supported bridges embraces planned cable replacement as a standard design case, issues still abound with items such as the replacement of bearings, joints and holding down bolts and safety fences. In the case of cable replacement, the load case is considered but not the impact on traffic, the use of temporary works and the safety of operators carrying out the works. In the design and build framework where performance specifications work well for strength and stiffness constraint, less attention is paid to the equally important maintenance design case. This paper looks at the difficulties in maintaining major bridges and the examines how designers can consider access and maintenance issues as design cases alongside conventional strength and displacement criteria, resulting in greater reliability of the structure. © 2012 Taylor & Francis Group.

Rees J.,Flint and Neill Ltd | Southgate M.,Arqiva
Journal of the International Association for Shell and Spatial Structures | Year: 2014

Digital television (DTV) antennas are often mounted on tall guyed masts; these are relatively flexible structures and will deflect and rotate under wind loading. Rotation of a DTV antenna will alter the population coverage and time availability of the broadcast signal. This paper presents a methodology for the assessment of the effect of guyed mast rotations under along-wind loading on the performance of broadcast antennas. The method is illustrated by application to Winter Hill Mast (north of Manchester) which, at the time of the study, has the greatest population coverage of any TV broadcast structure in the Arqiva portfolio. © 2014 by John Rees Martin Southgate.

Silla-Sanchez J.,West Gate Bridge Management Team Steel Section | Noonan J.,West Gate Bridge Management Team Steel Section | Percy R.,Flint and Neill Ltd
Bridge Maintenance, Safety, Management and Life Extension - Proceedings of the 7th International Conference of Bridge Maintenance, Safety and Management, IABMAS 2014 | Year: 2014

VicRoads is currently implementing a major programme of works associated with fatigue cracking in the steel spans of Melbourne's West Gate Bridge. Management of the fatigue cracking has been a feature of the bridge maintenance task from early in its service life, and with increases in traffic volume in recent years, the treatment of fatigue-prone details has become a major component of this task. This paper provides a summary of the typical fatigue cracking and the range of remedial treatment details that has been developed. The works includes both treatments for the remediation of areas that have cracked and treatments implemented to prevent cracking at locations identified as prone to fatigue cracking. © 2014 Taylor & Francis Group.

Yeow H.-C.,Flint and Neill Ltd
Proceedings of the Institution of Civil Engineers: Geotechnical Engineering | Year: 2014

The increasing use of the finite-element method in geotechnical design has raised the question of the compliance of this design approach with Eurocode requirements for the ultimate limit state conditions, especially when a more complex soil constitutive model has been used. Past authors have identified several important issues relating to the application of the finite-element method in ultimate limit state design, including the effects of initial stresses, effects of stress history, choice of soil model, significance of the failure of structural member and the timing when the partial factor of safety is applied during the design assessment. In this paper, an advanced ‘Brick’ soil model has been used to demonstrate its application in the design of different geotechnical structures and the effects of the design assumptions used in the design of these structures. The paper also demonstrates the versatility of the Brick soil model in the derivation of the new set of input parameters when the necessary partial factor is applied to the strength of the soil as required in the Eurocode design approach. © 2014, Thomas Telford Services Ltd. All rights reserved.

Wood H.J.,Flint and Neill Ltd
Geotechnical Engineering for Infrastructure and Development - Proceedings of the XVI European Conference on Soil Mechanics and Geotechnical Engineering, ECSMGE 2015 | Year: 2015

The Mersey Gateway Bridge includes a 1km long three tower cable stayed bridge across the River Mersey estuary. To optimise the span arrangement for the superstructure the plan extent of the foundations needed to be minimised. This led to the selection of direct foundations on sandstone bedrock identified at 10- 15m depth below the river bed. A description of the interpretation of the ground investigation data is presented to allow the design of circular spread footings. Details of the assessment of the bearing capacity and stiffness of the foundations are described and related to the proposed construction monitoring to verify the foundation behaviour. © The authors and ICE Publishing: All rights reserved, 2015.

Firth I.,Flint and Neill Ltd | Bahra A.,Flint and Neill Ltd
Engineering for Progress, Nature and People | Year: 2014

This opening bridge was the winner in an international design competition held by Copenhagen City Council during 2009. The elegant but subtly understated bridge has an opening span of 55m, a total length of 240m carries pedestrians and cyclists across the harbour between the heart of the city and the Opera House. The central steel opening part is 7m wide and has a unique sliding mechanism, rolling back between the two fixed approaches, each 4m wide, with one for cyclists and one for pedestrians. This unique opening system creates an experience which is expected to become a popular city centre attraction as well as an important new transport corridor for cyclists and pedestrians. This paper describes the design concept and evolution, and addresses the integration of architectural ideals and engineering requirements to produce a solution sensitive to its urban context.

Bonnett J.,Flint and Neill Ltd. | Cooper D.,Flint and Neill Ltd.
Engineering for Progress, Nature and People | Year: 2014

Assessment and the design of strengthening are important to ensure that our ageing infrastructure can continue to function. This paper examines the approaches that may be taken to the design of strengthening for a highway structure which does not meet assessment standards in its entirety. Three case studies are described to examine the reasons that different strategies have been applied to the use of loading and design standards. A particular example is given for the Hammersmith Flyover where the change to Eurocode loading would have had significant implications for the design of strengthening of key elements. It is concluded that application of full Eurocode provisions to strengthening projects is not always appropriate and that consideration must be given to the use of standards particular to individual circumstances to ensure that existing structures can be sustained economically and practically.

Walker C.,Flint and Neill Ltd | Stafford P.J.,Imperial College London
Proceedings of the Institution of Civil Engineers: Bridge Engineering | Year: 2010

Modal superposition techniques such as the responsespectrum method (RSM) can be used to quickly estimate the peak response of a structure to earthquake-induced vibration and, as such, are widely used in preliminary design. Modal-combination rules for use with the RSM are typically founded on assumptions of linear structural behaviour, well-separated natural modes, classical damping and stationary excitation. By contrast, the response of cable-stayed bridges is known to be nonlinear with three-dimensional orthogonal mode shapes that can be coupled and closely spaced. Furthermore, it is widely known that the use of stationary stochastic processes for modelling earthquake excitation is a firstorder approximation and there is thus sufficient reason to doubt the validity of the RSM for estimating the response of cable-stayed bridges. This paper critiques the historical development and theoretical consistency of popular modal-combination rules with a view to assessing their suitability for estimating the response of cable-stayed bridges and their relative performance is investigated using an example finite-element model. In many cases, the more sophisticated modal-combination rules can be reliably employed; however, numerous scenarios are envisaged where such rules are likely to be inaccurate and caution is advised against their use under these circumstances.

Firth I.,Flint and Neill Ltd
Structural Engineer | Year: 2010

For many engineers, the steel box girder story starts with disaster. The memories of the tragic events of 1970 and 1971 are still raw for some, and the implications have been far reaching. But the story is also one of bold innovation, lessons learnt and ultimate success. This paper explores the short history of the steel box girder and reflects on how it has shaped the evolution of the popular modern bridge structures we see today. © Ian Firth.

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