Construction works
The measurements on a construction work can have several purposes. For example, when producing as-built plans after work completion: we then make sure of the state of the work before commissioning. Another purpose can be to monitor the building on which we found movements: we therefore speak of monitoring.
The constraints linked to construction works surveys are often related to accessibility problems (size of the work, dimensions, landscape, possibly traffic etc): the laser scanner allows to survey high densities of points which will then be useful:
- to produce plans, profiles, sections, and as-built models of the construction if the goal is to have as-built at disposal. The accuracy range that we reach on such surveys is under one centimeter.
- to analyze the deformations of the work: the point clouds take up all the exterior surfaces with an accuracy of less thane 5 mm. The high density allows giving results at more or less 3 mm.
For projects such as:
- extension/modification of the work,
- widening of roads,
- infrastructure refit (highway toll stations, tunnels…)
- monitoring and follow-up of deformations
Benefits of the method:
- No traffic disruption,
- Measurements of the inaccessible,
- Immediate use of the surveys (heights of passages for example),
- Visualization of deformations,
- High level of detail,
- Shorter time to collect more data.
Do consult our references in Construction works, in particular:
Mobile laser scanner: 3D textured modeling of Construction Works: laser-scanner surveys are taken on board and integrated in 3D geographic information systems.
Hydroelectricity:Complete 3D interior and exterior survey of the Tignes dam. DTM, 3D AutoCAD plan, animation movie, VRML, Orthophotography.
Construction works:3D modeling of a cavity located under a bridge. Profile extraction and volumetric measurement calculation.
Tunnels:Laser scanner survey of 400 m of a tunnel on the A 43 highway 3D modeling of the work as a mesh, profile extraction and volumetric measurement calculation.
Construction works:Works monitoring or auscultation on highways by laser scanning: setting up of the reference tables, as-built plans, stone deformations and polygon accuracy.
