3D/BIM modeling of your buildings, as-built

BIM is the English acronym for Building Information Modeling, and corresponds to a collaborative way of working at the heart of which is placed the digital model of a building and an information structure linked to it.
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Selon le projet et les besoins recensés auprès des parties prenantes, il s’agira de définir les éléments devant être modélisés, et les niveaux de détail associés dans le cahier des charges du projet.
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BIM est l'acronyme de Building Information Modeling.
Il s'agit d'un mode de travail collaboratif centré sur la maquette numérique d'un bâtiment et les informations qui lui sont associées.

Pour mener une démarche BIM, la maquette numérique doit intégrer une base de données organisée des informations de l'ouvrage, et un mode de coordination spécifique doit être défini.

Ce mode de travail couvre l'ensemble du cycle de vie de l'ouvrage : conception, construction, gestion, exploitation, maintenance et démolition. Ainsi, l'ensemble des acteurs du bâtiment (agences d'architecture, bureaux d'études, exploitants, habitants, etc.) peuvent en tirer profit.

The level of detail (or LOD - Level Of Detail) corresponds to the geometric precision of a model, defined by the precision of the 3D objects it contains.

This level of precision makes it possible to obtain a greater or lesser degree of geometric information.
It can be adapted zone by zone or by category of elements represented in the model to adapt to the specificities of a project.

There are 5 different LOD levels (LOD 100, 200, 300, 400, and 500). Although no strict nomenclature exists, certain classical uses emerge for each of these standards in the design, construction and operation phases.

To find out more about this subject, we invite you to discover our two articles:
‍“Define the level of detail (LOD) of your BIM model” and” “BIM modeling: focus on the levels of detail of networks and terminals”.

A set of documents govern a BIM process by covering the life cycle of the structure. Among them, we can cite the cifications document, the Charter and the BIM Convention.Their role is to guarantee compliance with the BIM objectives set by the project owner and to organizecoordination between the various actors who work around the 3D model.
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To find out more about this, we invite you to read our article on BIM documents.

Since digital models are created in specific software, they have a so-called “native” format corresponding to each software (Revit, Autocad, Allplan, etc.).
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In our BIM modeling process, the export can be done in interoperable format (IFC) or in the native format of the Revit software, which is the one we use to model.
On this subject, we also offer you an article to better understand the challenges around digital model formats.

When it comes to creating 2D plans, we use Autocad and offer plans in .DWG format.

The building point cloud is used as a 3D layer of reality during the modeling and quality control phases of the 3D model, we call this method scan to BIM.
During the quality control phase of the model, the captured point cloud will be used to detect:

• Missing survey areas;
• Discrepancies between the point cloud and the model;
• Errors in interpreting the object being modelled.
• On site, the preparation and digitization of areas;
• Post-processing and exploitation of captured data

‍These various control methods will make it possible to produce a quality deliverable that complies with the modeling specifications.