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Engineering Geodesy
As-built Survey
A geodetic measurement that documents the actual position and parameters of constructed structures or utilities after construction completion.
An as-built survey is geodetic work in which the actual location, dimensions, and heights of a constructed object are measured and documented. It is a mandatory part of construction documentation.
Types of as-built surveys:
- Building as-built surveys - actual location of buildings and structures
- Utility as-built surveys - underground and above-ground communications
- Road and area as-built surveys - transport infrastructure
- Landscaping as-built surveys - exterior improvements
What does an as-built survey include?
- Object coordinates and heights
- Actual deviations from design
- Structure dimensions and parameters
- Material descriptions and markings
- Connection and node details
As-built survey phases:
- Hidden work survey - before backfilling or covering
- Interim measurements - during construction
- Final as-built survey - after complete completion
Utility as-built surveys:
Underground communication as-built surveys are especially important:
- Must be done before trench backfilling
- Pipeline depths and locations must be recorded
- Manholes, connections, bends must be documented
- Photo documentation must be attached
As-built survey documentation:
- As-built drawing - graphic representation with dimensions
- Coordinate list - precise X, Y, Z values
- Compliance report - comparison with design
- Photo documentation - photographic records
Importance of as-built surveys:
- For commissioning the object
- For warranty obligations
- For planning future repairs and reconstruction
- For updating utility databases
- For updating cadastral data