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As-Built Locations Through Precision Photography

by W. E. Holland, Stone & Webster Engineering, Corp, Boston, MA, USA,
S. B. Palinski, Stone & Webster Engineering, Corp, Boston, MA, USA,



Document Type: Proceeding Paper

Part of: Structural Engineering in Nuclear Facilities

Abstract:

This paper describes a new application of close range photogrammetry as a technique for obtaining reliable as-built locations of embedded threaded inserts in concrete structures and the use of the computer to enhance the usefulness of the digitized data in providing engineering documents and construction aids. An array of threaded insert is often provided along with embedded plates to accommodate the supporting of previously undefined system support baseplates. The construction tolerance achieved in the setting of the threaded inserts is generally insufficient to permit the use of predrilled holes in the support baseplates and still be within the limits for oversized holes permitted by the code. Therefore the location of each insert must be determined accurately so that matching holes of acceptable size can be provided in the baseplate. Photogrammetry is a science used to obtain reliable measurements from photographs was selected as the method of determining accurate locations. Photogrammetry is less costly and time consuming than conventional surveying and measuring techniques and also enhances performing to construction schedules.

Subject Headings: Photogrammetry | Construction methods | Concrete construction | Concrete structures | Structural reliability | Structural analysis | Reinforced concrete

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