Setting-out works are primarily a service for the contractor, who needs to know the exact location of the structures and other elements to be constructed. Setting-out becomes increasingly complex as buildings grow larger and more complicated. Many setting-out tasks must be carried out with an accuracy of 1–2 mm. Achieving this level of precision requires accurate and calibrated geodetic instruments, as well as well-trained, meticulous surveyors with construction surveying experience who know which methods and instruments are needed to achieve the required accuracy. It must always be understood that no measurement is absolutely exact—there is always some error, regardless of the performer. The key issue is the acceptable magnitude of that error.
The most important prerequisite for carrying out setting-out works is the availability of correct, valid, and today increasingly also digitally accessible design drawings and/or models. In practice, numerous problems arise where the design does not allow precise setting-out due to inaccurate dimensions or incorrect reference schemes. Occasionally, an outdated version of the design is provided to the surveyor. These problems can be significantly reduced by applying BIM technology in the design process.
To ensure the accuracy and effectiveness of setting-out works, the following are beneficial:
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Preparation of the construction site for setting-out works. It is pointless to carry out precise setting-out in dense vegetation or before excavating the foundation pit. For axis setting-out, a high-quality and durable reference framework must be installed in advance.
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Communication between the contractor and the surveyor, so that the contractor clearly understands which points are indicated by the installed markers.
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Consideration of setting-out works by other personnel on site, ensuring that markers are not driven over by machinery and that no hazardous or vibration-inducing works are carried out during setting-out.
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Use of a single surveying company on one site, to avoid discrepancies between reference points established by different surveyors.
REIB provides everything within our control, and everything that modern measurement technology makes possible, to ensure that your construction works proceed accurately and without disruption.
