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London Underground Underpins Planning, Design, Assurance, and Construction Processes with Bentley’s 3D Technology

London Underground Underpins Planning, Design, Assurance, and Construction Processes with Bentley’s 3D Technology
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London Underground Underpins Planning, Design, Assurance, and Construction Processes with Bentley’s 3D Technology - 1

CASE STUDY Project Summary Organization: London Underground Ltd Solution: Rail and Transit Location: London, United Kingdom Project Objective: • Safely replace the deteriorating tunnel lining over a 215-meter section of the Jubilee Line. • Maintain operational tunnel infrastructure without detrimental consequences to the safe running of passenger trains. Products used: AECOsim Building Designer, Bentley Descartes, Bentley Navigator, Bentley Pointools, Bentley View, MicroStation, and ProjectWise Fast Facts • ProjectWise helped LUL build a cohesive team and leverage the collective intelligence of the group. • Bentley software allowed the project team to deliver a robust solution through the application of virtual design and value engineering. • The Bond Street to Baker Street Tunnel Remediation Project won the “Greatest Contribution to London” accolade at the London Civil Engineering Awards 2014. ROI • Bentley ’s 3D technology improved planning, design, and assurance efficiencies resulting in time savings of up to 20 percent, the recycling of 92 percent of all tunnel lining removed, and the safe reuse of 77 percent of tunnel equipment assets. • Commissioning two segment handling plants (SHP) doubled productivity and contributed to the tunnel relining being completed four months ahead of schedule. London Underground Underpins Planning, Design, Assurance, and Construction Processes with Bentley’s 3D Technology Jubilee Line Remains Operational while London Underground Replaces Tunnel’s Lining Models Propel Project The London Underground Ltd (LUL) Bond Street to Baker Street Tunnel Remediation Project undertook the safe replacement of deteriorating expanded precast concrete (EPC) lining with a spheroidal graphite iron (SGI) lining in a 215-meter tunnel segment on the Jubilee Line—while it remained fully operational. The major challenge of this GBP 34 million project was to maintain functional tunnel infrastructure without detrimental consequences to the safe running of passenger trains. LUL initiated this project with an ambitious target of 20 percent cost reduction by improving planning, design, and assurance efficiencies. AECOsim Building Designer, Bentley Descartes, Bentley Pointools, Bentley Navigator, and ProjectWise enabled collaboration and supported creation of a geospatially accurate, fully coordinated 3D model. With the use of Bentley technology for 3D visualization and animation, 4D planning, 3D printing, and virtual reality, all stakeholders and decision makers understood the design and project intent without ambiguity. LUL realized time savings of up to 20 percent by starting design and assurances processes earlier in the project lifecycle—made possible, in part, by the early creation of a 3D laser scanned model of the project site. Passenger Safety, Convenience Carrying 240 million passengers per year, the Jubilee Line is an essential link in the underground railway network serving Central London (West End) and Canary Wharf (Financial District). LUL operates a service of 30 trains per hour during morning and evening peak travel times. The original tunnel lining along the Bond-to-Baker Street stretch was installed in the 1970s and had begun to deteriorate, causing potentially unsafe conditions. Closing a major section of the line for repairs would have taken trains out of service for months, and postponing repairs would have increased the risk of tunnel integrity failure during passenger traffic hours. The preferred solution was to undertake the tunnel relining project while maintaining fully operational infrastructure. Preventing the disruption or inconvenience of passenger travel was paramount, with LUL aiming to support the continued safe running of 30 trains per hour, without the need for speed restrictions. The scope of work was extensive. Foremost was safely replacing the EPC tunnel segment lining with SGI lining. Preand post-site enabling works had to be erected to reroute, relocate, and reinstall all the infrastructure required to keep the line running during passenger traffic hours. Preventive measures also had to be taken to mitigate movement, which involved tunnel segment structural support strapping. This work had to be done in the minimum amount of time, with minimal noise vibration or environmental effects. The EPC tunnel lining segments were to be replaced during engineering hours, which were limited to 2.5 hours per night. All materials, construction personnel, plant equipment, and removed EPC segments had to be transported to and from the single bore tunnel before passenger traffic resumed. An Inside Job To ensure the project was conducted to the satisfaction of all stakeholders—including the mayor’s office, Transport for London, industry regulators, and the press and public—LUL decided to undertake the design, assurance, project management, and construction in-house. It was an opportunity to uphold LUL’s reputation and demonstrate a standard of excellence in the industry. Original tunnel lining installed in the 1970s showed signs of water ingress, causi

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London Underground Underpins Planning, Design, Assurance, and Construction Processes with Bentley’s 3D Technology - 2

“Bentley software solutions helped LUL build a cohesive, collaborative design, assurance, and construction delivery team, allowing us to leverage the collective intelligence of the group. The software ensured that we were able to manage uncertainties inherent in today’s complex infrastructure projects, and deliver with confidence.” — Garry Pratt, Project Manager, Bond Street to Baker Street Tunnel Remediation Project, London Find out about Bentley at: www.bentley.com Contact Bentley 1-800-BENTLEY (1-800-236-8539) Outside the US +1 610-458-5000 Global Office Listings www.bentley.com/contact...

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