the importance of survey within design & construction · • the surveyor must emphasise / sell...
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The importance of survey within design & construction Presented by Alex Martinov, TrackRight Consulting
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Is this a No-Brainer ?
• The topic name sounds like a no-brainer to any Surveyor, but it is important to clearly explain / educate / inform Project Managers and Engineers on survey best practice methods and how these will benefit their project
• Based on my experience, most Project Managers & Engineers do not have a clear understanding of what expertise a Surveyor can bring to a project and how to exploit this knowledge
• The survey will provide one Co-Ordinated spatial referencing system for the lifetime of the project. It will embrace all the survey work required for engineering design, pre-construction early works, construction setting out and provision of “As-Built “ data and future maintenance
• When given an opportunity, the Surveyor must have a comprehensive understanding of what the project involves, and then must optimise the required surveying services from project start to finish
• The Surveyor must emphasise / sell the importance of establishing appropriate survey requirements for each Design & Construction project, as it is not ‘one size fits all’, as most Project Managers and Engineers believe
• Emphasise the need for a coordinated approach • Aerial mapping by Lidar combined with ortho-rectified photography • Importance of a cadastral survey, and a lessons learnt example • Services and Utility surveys, and a lessons learnt example • Interface with GIS
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The purpose of an Engineering Survey
consists of:
• CONTROL NETWORK – provides a spatial 3D coordinate grid system
• TOPOGRAPHIC & INFRASTRUCTURE DETAIL SURVEY – localised capture of all natural & man-made features for investigation and design purposes
• CADASTRAL SURVEY – establishes position of relevant legal property boundaries and existence of easements, leases or any other encumbrances
• SERVICES & UTILITIES SURVEY – establishes the existence and location of above and below ground services within and near the project’s perimeter area
• Often the client will need educating on the requirements needed!
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MGA ZONE WIDTH BOUNDARIES
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Topographic and Infrastructure Detail Surveying
• Every project site will have a unique mix of existing natural and manmade features which require survey data capture
• Small sites are usually covered by ground-based survey, but not alwaysdue to project site
• For very large sites data capture by LIDAR and Ortho-rectified aerial photography will provide time and cost benefits compared to ground survey
• If survey information is provided by the client an independentverification / audit would be advised to mitigate data conflict mid design
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Aerial mapping by Lidar combined with ortho-rectified photography
• Considerable time and cost benefits compared to conventional ground survey, but can be significantly less accurate
• Requesting higher accuracy and resolution deliverables by aerial methods will significantly raise the costs
• Lidar unable to determine water depth, culvert and pipe inverts, etc. so additional ground survey must be factored in. Pooling of water during heavy rain periods will distort surface model / earthwork design
• Ground survey is still required to accurately locate existing structural infrastructure
• TRUTHING BY GROUND SURVEY MUST BE CARRIED OUT TO MITIGATE ERRORS IN AERIAL MODEL DATA (do not blindly accept)
• IF SURVEY INFORMATION IS PROVIDED BY THE CLIENT, AN INDEPENDENT VERIFICATION / AUDIT WOULD BE ADVISED ESPECIALLY IF THE CLIENT WANTS A THIRD PARTY TO TAKE OWNERSHIP OF DATA SUPPLIED
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Benefits of a Cadastral survey
Area between Bd’y & Fence has potential for infrastructure encroachment
Excess land now available for use
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Sketch of proposed conveyor plant layout
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Proposed survey scope & amended scope End poi n t
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Services & Utility Surveys (use in design)
Potholed location differs from scanned location by approx.1.5m
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Services & Utilities bottom line
• To mitigate risk all critical services must be located by direct exposure this is cost and time intensive, NO CUTTING CORNERS
• All bends and junctions must be spatially located
• Hold points in program must be placed for survey team to locate accurately, before cover up