BIM Best Practice

To achieve technical excellence and a successful outcome to a project, it is essential that BIM information and output is carefully planned & standardised. This must involve explicit attention to management, display and quality of the design data.

Below are a number of best practice principles that will help create efficient, high quality deliverables.

BIM Execution

  • Determine project requirements for BIM, Regardless of the existence of an Client requirements. Key here is what graphical (Level of Development (LOD)) and non- graphical (Level of Information (LOI)) information is required and when.
  • A Project BIM Execution Plan (BEP) appropriate to the project stage shall be put in place that identifies who is responsible for key project tasks, outputs and model configuration and how project requirements are to be met. Check out the AEC-UK templates as a great start point.
  • BIM project reviews should be agreed and take place regularly to ensure model integrity and project workflow is maintained, to achieve the project requirements, and that the BEP is being followed and maintained.
  • It is imperative for smooth information exchange that clear guidelines are developed for internal and external collaborative working which maintain the integrity of electronic data.
  • Identify clear ownership of model elements through the life of the project.
  • Sub-divide models between disciplines and within single disciplines to avoid file sizes becoming too big or slow to operate (agree a project volume strategy in the BEP as early as possible).
  • Understand and clearly document Modelling Methodology. i.e. what is to be modelled and to what Level of Detail. Do not over model.
  • Do not over Document (be careful at early project stages in particular).
  • Define clearly the data (Level of Information (LOI)) to be incorporated into the BIM relevant to the stage.
  • Together, the LOD and LOI help to better communicate the expectations of BIM content and clarify the Level of Definition at any point in the design and construction process.
    • Level of Definition = LOD + LOI
  • Avoid disconnect between the main 3D model and 2D views or output. Revisions to the project should be made “at source” (i.e. in the model) to rather than editing the 2D to ensure the integrity of the model and coordination between the BIM and its output. Do not double up on 2D & 3D tasks, do it once in the model.
  • Outstanding warnings shall be reviewed regularly and important issues resolved.

Drawing Production

Where drawings are a product of the BIM, traditional drawing conventions still apply, for example:

  • A drawing shall contain design information solely for the purpose of the intended use of the drawing.
  • Numbers of drawings should be kept to an absolute minimum and organised in a logical manner.
  • The number of drawings should be kept to an absolute minimum and organised in a logical manner. Encourage the model to be used instead where possible.
  • To maximise efficiency, a policy of minimum detailing without compromising quality and integrity shall be adopted and repetition of details should be eliminated.
  • Avoidance of duplication is essential to ensure drawings maintain their integrity as the iterative design process progresses and amendments are made.
  • All drawing symbols used should be in line with industry standards.

Of course, 2D documents must be derived from a coordinated, federated, clash detected set of models.

The CIC BIM protocol states that if there is a discrepancy between what is delivered in the form of the models and the 2D .pdfs that it is the federated model data that should be referred to as the primary data source. You cannot just do your 2D work and then deliver a model as well – the model has to be what is delivering the 2D output in the first place.

Import PDF as AutoCAD Objects

Lynn Allen, Cadalyst contributing editor and Autodesk Technical Evangelist , presents a useful video for AutoCAD professionals. In this video tutorial, Allen provides some useful cad tips to transform PDF files (underlay) to AutoCAD objects.

So, the AutoCAD users can get rid of time consuming tracing on top of PDFs to reproduce objects or draw it from the beginning.

You can import the objects in a PDF file or PDF underlay into your current drawing file.

Import the Data from a PDF File

  1. Click Insert tabImport panelPDF Import Find
  2. In the Import PDF dialog box, specify the PDF file that you want to import, and click Open.
  3. If the PDF has multiple pages, choose the page to import by clicking a thumbnail image or by entering a page number.
  4. Choose any of the options and click OK.
  5. Specify the insertion point if prompted.

Import a Specified Area from a PDF Underlay

  1. Select the PDF underlay.
  2. On the PDF Underlay contextual tab, Click Import as Objects.  Find
  3. At the prompt, click two diagonal points that define a rectangular crossing area, or choose one of the other options.

    A crossing area is similar to a crossing selection. The Settings option displays a dialog box in which you can choose what types of objects to import, how layers should be accommodated, whether the imported objects should be imported as a block, and several other options.

  4. Choose whether you want to keep, detach, or unload the attached PDF after the selected objects have been imported.

The specified area of the attached PDF is imported into the drawing as AutoCAD objects.

For more details, watch the following video tutorial.

 

 

Revit App: Autodesk Model Checker

 

Lowdown

This free tool will automatically check your Revit models based on a
set of BIM requirements and generate a compliance report.

Features

  • Multiple configurations are included: U.S. Army Corps of Engineers, COBie, overall reporting, and many more coming soon.
  • Instant feedback is given via reports as project teams run checks at any point to gauge their compliance.
  • Direct model integration allows reports to be saved in, and travel with, the models for all to review.
  • Configure your own model checks using the Model Checker Configurator tool.

Description

The Model Checker automatically checks Revit models and assists with verifying compliance to BIM Requirements. The add-in is designed to quickly identify possible conflicts or areas of non-compliance in a model by running several standards checks which can be viewed or exported for analytical review.

While the Model Checker should not supersede the rules or recommendations put forth by any authority having jurisdiction, it does provide useful guidance for BIM compliance throughout a project’s development.

You can configure your own model checks using the Model Checker Configurator tool.

A collection of videos covering how to use the Model Checker for Revit.


Info

Install: www.biminteroperabilitytools.com

Cost: Free

Compatible with:

  • Autodesk Revit – Version: 2017 , 2016 , 2015, 2014, 2013
  • Autodesk Revit Architecture – Version: 2016 , 2015 , 2014, 2013
  • Autodesk Revit Structure – Version: 2016 , 2015 , 2014, 2013
  • Autodesk Revit MEP – Version: 2016 , 2015 , 2014, 2013