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Costain Explores Photogrammetry to Document Site Conditions for GBP 6.5 Billion Project

Costain Explores Photogrammetry to Document Site Conditions for GBP 6.5 Billion Project
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Costain Explores Photogrammetry to Document Site Conditions for GBP 6.5 Billion Project - 1

Project Summary Organization: The Costain Group Location: London, England, United Kingdom Project Objectives: • Provide detailed design and construction for the redevelopment of London Bridge Station. • Determine the most efficient, cost-effective method for surveying and documenting existing site conditions of the 180-year-old train station. • Deliver accurate 3D data to accelerate and enhance decision making for optimal construction planning. Products Used: ContextCapture Costain Explores Photogrammetry to Document Site Conditions for GBP 6.5 Billion Project ContextCapture Delivers Efficient, Cost-effective Solution for Reconstruction of London Bridge Station Fast Facts • The Thameslink project is a GBP 6.5 billion railway initiative that, upon completion in 2018, will transform UK rail travel, increasing passenger capacity and improving travel time. • Costain was awarded the GBP 400 million contract for the redevelopment of the 180-year-old station, including construction of the country's largest concourse. ROI Using ContextCapture allowed Costain to generate a 3D textured reality mesh in just a few hours, saving time and costs on this GBP 400 million project, while minimizing the impact of surveys on the rest of the site. The redevelopment of London Bridge Station will meet growing transportation needs by increasing passenger and rail capacity at the station by 40 percent. Upon completion in 2018, the reconstructed station will connect many regional destinations on either side of London for the first time. Railway Redevelopment Plans As part of its vision to improve the safety, reliability, and efficiency of railway travel within the city of London and throughout the United Kingdom (UK), Network Rail undertook responsibility for the government-sponsored GBP 6.5 billion Thameslink project. The project was initiated in 2009 with an expected completion in January 2018, when new spacious trains will travel through central London at peak times every two-to-three minutes. The massive railway improvement scheme includes platform lengthening, station renovations, new railway infrastructure, and additional railway vehicles. It involves collaborative efforts among UK train companies, architects, engineering and design firms, and construction organizations, all managed by Network Rail. At the heart of the Thameslink initiative is the redevelopment of London Bridge Station, the UK's largest and fourth busiest station handling over 56 million passengers each year. Plans for the London Bridge Station involve reconstructing its concourse to unify the station for the first time, allowing passengers access to all platforms in one place, as well establishing new retail stores and station facilities. Upon completion, the new street-level concourse will be the largest in the country, exceeding the size of the pitch at the iconic Wembley Stadium. To manage the London Bridge Station refurbishment, Network Rail awarded The Costain Group (Costain), one of the UK's leading provider of engineering solutions, a GBP 400 million contract under which Costain is responsible for delivering detailed design and reconstruction plans. "Our focus is to design and deliver a world-class London Bridge Station that enhances the capital's infrastructure and improves the journeys of the hundreds of thousands of passengers who pass through the station every day," commented Andrew Wyllie, chief executive of Costain. Challenges Reconstructing London Bridge Station The sheer size of reconstructing London Bridge Station to include 15 new platforms presented numerous demands ranging Horizontal cut of the rebars showing accurate comparison of photogrammetry to terrestrial laser scanning (TLS): blue circles represent photogrammetry, and red circles represent TLS; maximum deviation is ~6-10 millimeters. from reconfiguring the station's tracks and installation of new signaling, to demolishing existing platforms and removing the existing roof, all while keeping the station operational. To minimize passenger impact it was decided that the project would be completed in nine phases. To implement its phased construction approach, Costain and the project team needed to obtain reliable data for the nearly 200-year-old site. Originally constructed between 1836 and 1839, London Bridge Station housed a considerable amount of masonry arches that required surveying to determine the optimal approach for designing and constructing the new concourse. To obtain this information Costain needed cost-efficient survey techniques that could generate an accurate 3D representation of the aging structures to understand the subsurface for reconstruction potential and enable stakeholders to make informed decisions on a tight deadline. Photogrammetry vs. Laser Scanning For years laser scanners have been the preferred method of capturing digital data to survey and document site conditions with precise accuracy. Laser scanning provides the ability to capture a point cloud so dense that it's almost a 3D picture. Points in the scan are given 3D coordinates and this virtual geo-referenced representation can be shared among the design team. Costain has invested in this technology to successfully deliver numerous projects. However, given the age of the structures

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Costain Explores Photogrammetry to Document Site Conditions for GBP 6.5 Billion Project - 2

"With just a smartphone, the entire workforce has the potential to document visually-rich 3D construction progress with a minimal amount of training. ContextCapture is changing data capture onsite." - Richard Bath, graduate surveyor, Costain 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 ContextCapture automatically processed images into accurate 3D mesh models documenting existing conditions of London Bridge Station and facilitating decision making for redevelopment. at...

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