What is 3D Laser Scanning?
4 applications that can benefit your construction project
3D laser scanning, also called 3D Point Cloud scanning, is used to create an accurate digital model of an existing building or physical space. This digital scan is then converted to a BIM (Building Information Model), so it can be used for project planning and project management.
How does 3D laser scanning work?
LiDAR (laser, detection and ranging) technology is used to scan the site. This is a non-contact technology that uses 3D laser scanning to accurately detect the surfaces in any space. It is especially useful to measure hard-to-reach points in your structure and create an accurate drawing or model of your space. This can be detailed enough to capture wall textures and exposed MEP systems.
The device has an eye-safe laser rotating at a high speed; when it hits a solid surface, it records its position as the data points. This data is captured as a Point Cloud, which contains millions of individual measurement points and each data point has an x, y and z co-ordinate. This gives a highly accurate digital record of all the objects in a space.
3D laser scanning is quicker than a traditional survey and gathers more detailed data. The digital data is also easily translated into a BIM (building information) model using specialist software like Autodesk Revit.
What is 3D laser scanning in construction most useful for?
To help you understand how 3D laser scanning can benefit your project, we’ve compiled a short list of the most relevant applications for construction. Of course, this list is far from exhaustive, so if you have a project in mind where this technology could help you save time, costs or avoid errors, please contact our expert team. They’ll be happy to advise.
Application #1: As-built models
Point Cloud data can be used to create highly accurate as-built BIM models. The output is a model showing the actual conditions of a construction project that is either already completed or part-way through.
Once a construction project is complete, it is important to note any changes to the initial design made by contractors during the project. This forms part of the as-built handover. As it is faster than a traditional survey, using 3D laser scanning can save time and costs, while also producing a more detailed model.
Application #2: Progress tracking on construction projects
Without regular progress tracking, you have no way to monitor whether or not your construction project is on track to meet deadlines and budget constraints. 3D laser scanning allows you to capture the current state of the build quickly and easily, for regular updates as the project progresses.
Regular updates give you the benefit of spotting potential issues earlier, meaning you can resolve problems more easily and avoid costly errors.
Application #3: Early clash-detection
Point Cloud data is detailed enough to map MEP systems before construction starts, which allows you to identify any potential clashes, for example between plumbing and electrical components, before construction begins. It can also be used once the build has started to check the potential for clashes when changes are made to the initial design.
The benefit for you is reducing the need for any costly and time-consuming changes once a system is installed.
Application #4: Heritage and conservation projects
An application that we find particularly useful for our construction clients is using 3D laser scanning for heritage and conservation projects. Where the existing building must be retained, an intricate model can be easily created, even when there are no original drawings available.
In a recent case study, MultiCAD completed a point cloud scan as part of a 10 year plant replacement project at the Old Bailey. The scans were then used to produce a Revit / BIM model to expertly co-ordinate the plant replacement works.
What is MultiCAD’s 3D laser scanning process?
The creation of accurate BIM models using Point Cloud data is not as easy as pointing a scanner and clicking some buttons. For good results, the software must be guided to effectively interpret the laser scans and this depends on understanding the nature of the project and the site materials. Our expert technicians use a well defined process to ensure you get reliable outcomes.
1. Capture
We gather as much information as possible from both the site and the client so we can define the Scope of Work and timeline. We then use the most advanced 3D laser scanners available to record the exact dimensions and details of the space.
2. Process
We inspect the Point Cloud scan to check for interruptions in the data fluidity both through the software and manually. This ensures the integrity of the data.
3. BIM Modelling
The scan is imported into Revit, our BIM software. The Revit file will be set up according to the Scope of Work and the level of detail required by the client. Each element is modelled as a single Revit Element, using single column groups.
4. Quality Assurance
Once the model is created, we carry out a number of final checks for consistency across different parts of the model, to ensure the highest quality model is available for your project.
How much does 3D laser scanning cost?
You can find out more about MultiCAD’s 3D laser scanning services or to get a quote for your construction project, please contact us.
