Scan2BIM Process

Creating high speed, high accuracy Building Information Models, using 3D Laser Scanners, supported by robotic total station control networks.

Scan2BIM Process

1) Specify

Every project begins with agreeing a scope. Our Scan2BIM Specification Guidance aims to provide our clients with an in-depth understanding of our process, methodologies, what we can offer and how we achieve that.

The specification clearly illustrates the level of detail (LOD 1 – 4) on a component by component basis. This gives our clients full flexibility, ensuring that employer’s requirements are refined, only including what is necessary. Also explained are our survey techniques, accuracy, tolerances, level of information (LOI) and interoperability.

Our Scan2BIM Check-List is an interactive PDF which allows clients to select their preferred LOD and LOI for each component. Once the check-list has been completed a quote can be provided to complete the project.

Key Steps:

Exchange of Specifications / EIRS

Initial meeting prior to quotation stage / site visit (for complex projects)

Quotation

Pre-contract BEP supplied

Instruction

2) Survey

Once instructed, a Project Manager will gather the necessary information, arrange access, assess Health and Safety requirements and allocate the appropriate site team and equipment. Firstly, our surveyors will familiarise with the site surroundings and agree upon the location of survey control. Using a total station, each control point will be surveyed into a closed traverse. Laser Scans will be coordinated to the control where possible, infilling with free stations.

Key Steps:

Access arranged by Severn Partnership Project Manager.

Health & Safety documentation completed Severn Partnership HSQE.

Installation of survey control network & laser scanning.

3) Office Processing

Once the site work is completed, the data is downloaded, processed and cleaned. The single unified point cloud is then converted into a format compatible with the preferred 3D modelling software package.

Work in progress models are reviewed at various milestones throughout each project. This enables issues to be noticed and resolved at an early stage, improving efficiency and ensuring quality data is delivered, on time.

Key Steps:

Survey control processing.

Data import & cleaning.

Scan registration (visual alignments).

Export to 3D modelling software.

Provide the necessary template (SEED / layering files).

Begin 3D modelling.

4) Handover / Data Drops

Key Steps:

Work in progress quality assurance procedures.

Work in progress meeting with the design team to ensure any issues are mitigated (for complex projects).

Final quality assurance checks completed.

Submission of models as per the agreement (i.e staged if necessary – LOD throughout design stages).

Model maintenance & adaption.

Return visits – construction verification, clash detection, coordination.

If you would like a copy of our specification, please contact shelby.green@severnpartnership.com.