Existing Conditions Modeling

Dictionary
Digital Construction (electrical)

term introduced first in PAS 1192 and updated in ISO 19650 framework, it depicts the process of specifying and delivery of project and asset information

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forms a framework that supports informed and consistent decision making by project teams, at each work stage, helping to deliver agreed and reliable information.

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Exchange Information Requirements (EIR) term introduced by BS EN 19650 replace the PAS 1192 term Employer Information Requirements (EIR) on all projects where BS EN ISO 19650 compliance is required.

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The term introduced by ISO 19650 typically describes the Tier 1 Main Contractor.

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breakdown structure to help plan the production of information

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schedule of information containers and delivery dates, for a specific task team

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An MPDT its old PAS 1192 term, the MPDT defines who produces what, when and to what level of detail.

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A process of developing a 3D model of the existing conditions for an asset, or a specific area within a facility.
The model can be developed based on laser scanning surveys (point cloud scans) or conventional surveying techniques.

Objective:

  • Increase quality of design with accurate representation of existing conditions such as existing assets & topography.
  • Increase quality of constructability analysis with accurate representation of building shell
  • Increase quality of site logistics at with accurate representation of building shell for equipment and material loading

Potential Value:

  • Enhances the efficiency and accuracy of existing documentation
  • documentation of environment for future uses
  • Aids in future modeling and 3D design coordination
  • detailed layout information
  • Pre-Disaster planning
  • Post-Disaster record
  • Use for visualization purposes

Resources Required:

  • Building Information Model modeling software
  • Laser scanning point cloud manipulation software
  • 3D Laser scanning
  • Conventional surveying equipment

Process:

  • Surveyor establishes control points on site, including model base-point, or origin
  • Surveyor documents locations of existing conditions such as buildings, utilities and topography
  • Design Team precisely locates existing conditions in model and designs new systems

Team Competencies Required:

  • Ability to manipulate, navigate, and review a 3D model
  • Knowledge of Building Information Model authoring tools
  • Knowledge of 3D laser scanning tools
  • Knowledge of conventional surveying tools and equipment
  • Ability to sift through mass quantities of data that is generated by a 3D laser scan
  • Ability to determine what level of detail will be required to add “value” to the project
  • Ability to generate Building Information Model from 3D laser scan and/or conventional survey data

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