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Feedback from OXAYA: Successful completion of its first BIM construction project with Léon Grosse's Ghislain QUENET

Banner-succeed-his-first-draft Construction-en BIM-with-Ghislain QUENET-de-Lon Grosse --- Back-dexprience-Oxaya

Hello Ghislain Quenet, What route did you have to join Leo GROSSE as BIM manager ?

Engineer Training IS P, I had been able to do a final internship at GTOI (Major Works of the Indian Ocean) (subsidiary of COLAS in the DOM-TOM) within the Technical Department to carry out the following mission: "Ensure the transition of the Methods department into a BIM process". I learned how to model on Revit, to train me succinctly on the methods, to master the tool Navisworks (especially the TimeLiner).

I then moved to London for my first job as a BIM Coordinator at Bouygues UK. I was busy making clash detections for an office project on 8 levels Hounslow Civic Center ". I had also kept my cap " BIM 4D For various applications on other BIM projects such as " Cambridge Assessment "," Ebury Center It was during this experience that I was able to learn about Dynamo and to a lesser extent on 3Ds Max for some realistic renderings. It is current spring 2016 that I have been contacted by Léon GROSSE for this new challenge as BIM Manager Rhône-Alpes, a post that never ceases to fascinate me.

What is LG's (Léon GROSSE) strategy around BIM and the digital transition?

In June 2015, Bertrand Grosse is appointed Chairman of the Management Board and launches a new project for the company to become "More reliable, more fluid, more humane, more innovative". The goal is to evolve the company to enable it to meet the current and future challenges of the business. This is reflected in a strong digital transition and broad diversification.

A strategic plan has therefore been put in place to achieve this goal: "2020 Ambitions". On the "innovative" aspect, and in particular that of BIM, the "100% BIM" initiative was launched at the beginning of 2017. The objective is clear: By the end of 2020, the BIM must be exploited well in studies that work on all our projects.


How did you initiate the deployment of BIM at LG?

Léon GROSSE started his adventure with the current BIM 2013 when the first digital models were born for very technical and very complex projects like the construction of the Jean Bouin Stadium. By training internally but also by welcoming new profiles via internships, Léon GROSSE began to see the creation of a team of specialists trained and interested on the subject of BIM in general.

Building on these early experiences, the Digital Pole was able to see the light of day (currently led by Mickaël PAPAZIAN). This cluster, based in Île-de-France, aims both to coordinate BIM actions across the national territory, to centralize the knowledge of each collaborator, to communicate and to be at each moment in watch on news technological advances related to BIM.

Could you tell us a bit more about the Oxaya Pilot Project?

The Oxaya pilot project, the construction of an office building spread over 4 levels (7 150 m² SU) and 2 parking levels, is part of this process of developing BIM at the national level. In 2016, it was decided, in consultation with the project owner, that this project would be the first BIM project for the Rhône-Alpes region at Léon GROSSE. The project management also wanted to participate in such a process and be involved in the design phase. The goal was clear : Léon GROSSE must explore the maximum of applications related to BIM that can involve a maximum of actors on the project (project management, project management, studies, companies and site team).

The first actors involved in this process were:

  • The architectural firm XANADU, architect of the project
  • The structural design office CEH
  • The fluid studies office RBE

The companies and design office involved in EXE and DOE phase were:

  • The structural design office CEH
  • The HVAC and Plumbing Company ORIOL
  • The Electricity Company ROIRET Energies
  • The design office CEBATEC (3D modeling mission of the technical batches)
  • The company of external joinery ADNS
  • The business SAPA, manufacturer of aluminum joinery for exterior joinery (supply of 3D families of different types of exterior joinery)
  • The business Léon GROSSE (in-house modeling of architectural lots in relation with the architect)
  • The business BIMly (technical assistance and making the DOE model)
  • The business Leica (supply of Total station)
  • The business Resolving (supply of the "tablet" solution)

The cell of technical and architectural synthesis was provided by Léon GROSSE and constituted of the BIM Manager, a specialist in technical synthesis and a specialist in architectural synthesis.


In concrete terms, how did you go about implementing the BIM in this project?

After a meeting with the project management to present the basic principles of the BIM and the BIM convention of the project on the common rules to be adopted, there followed the model modeling period 3D PRO intermixed model coordination meetings for to approach different design points observed during the compilation of the different models. At the end of the PRO, the next step was to find the companies that were going to follow us in EXE as a continuation of this BIM process.

Having done this, the PRO models have been sent to the companies so that they continue to be supplemented with new elements and specified in terms of information to gradually reach an EXE level. To ensure this continuity of the model, it was noted that these models, both in design and execution, would be made on REVIT. The formwork plans were extracted directly from the models as well as the network plans and the terminal plans.

The technical and architectural synthesis was done via Navisworks Manage and the results were either presented under Navisworks, or in Revit via cuts. At the end of the summary meeting session, a Synthesis model was distributed to companies containing the various points and actions to be taken during the meeting. The project-wide synthesis lasted 4 months, which is remarkable considering that it was a new way of working for all stakeholders.

Following this, the model of architectural lots could be improved, specified and informed and include the exterior joinery modeled as REVIT families.

The last step was to compile all the DOE's of the different batches and produce a thin global mockup that would contain all the attached files in order to make it a digital DOE. This DOE was then passed on to the project owner, finalizing the project's BIM mission.


What was the role of the Methods Department in this project?


The other goal was to include the Methods Department in this first BIM project. With several PIC 3D and 3D phasages Rather, the Methods Department wanted to use its expertise in Revit and participate in the production of Methods files for the construction site.

This project was therefore an opportunity to use the tools and 3D objects created by the Digital Pole, to lay the foundations on the concepts of cycles, rotations and bridge plans to create its own project template "Léon GROSSE - Methods ".


How did you transport the BIM to the yard and what were the usual cases?

It was out of the question not to bring the BIM model to the construction site! In addition to participating regularly in the 3D synthesis meetings, the various members were able to benefit from some everyday applications by using the model:

  • Implementation of points on site via the total station: the plan views of the project were imported in DWF in the station. The site manager then designated the point he wanted to implement and by 3 terminals located at 3 different locations of the project, the station automatically positioned the point via the laser.
  • Using the tablet for remarks and remains to be made: the model was deposited on a server connected to the tablet. The work drivers could go to the building site with the tablet and have all the 2D plans and the 3D view to be able to make their observations and finally get a report of the remains to be sent to the companies concerned.
  • Extraction of quantities : Extractions of quantities have been made since Revit to answer various requests.


Succeeding your first project is for any BIM project!

The important thing is find motivated peoplewho believe in the process and who are ready to discover new ways of working: more collaborative, more automated, more precise, more rigorous. I would say that if you have found these companies then the project can only go well. Because, it can happen obviously errors, problems. But if the different actors go ahead and never back down before this mountain that can be the BIM, the project can not be a failure.

Being a BIM Manager also requires a lot of rigor on the respect of the processes, on the respect of the common rules, on the checks, on the follow-up of the modifications, ... In this project, some people did not necessarily have several projects BIM to their assets before to start OXAYA. But they have hung on and have always been eager to learn new tricks to gain efficiency and accuracy.

The priority is the human. The models, they will follow!


Major player in construction in France with more than 2 400 employees et a turnover of more than 800 million. Since 137 years, Léon Grosse raises the great architectural and technical challenges: renovation and enlargement of the stadium Geoffroy-Guichard in Saint-Etienne (2014), stadium Jean-Bouin in Paris (2013), 4 satellite of the airport of Paris-Charles -de-Gaulle (2012), Aix-en-Provence TGV station (2001), Strasbourg European Parliament tower (1998), renovation of the National Museum of Natural History in Paris (1995), cover of the quays of the Lyon-Saint-Exupéry TGV station (1992) or the Super-Italy tower in Paris (1974).

100% entrepreneurs, Léon Grosse is involved in most construction activities: general contractor, structural work, state bodies, engineering and major projects, real estate development, nuclear civil engineering, energy and rehabilitation of social housing on occupied site. Léon Grosse is positioning himself as a global construction company.


"The world of business is changing, attitudes are changing and this is a unique opportunity to break the blockages and misconceptions about our trades. Precisely, the BIM will blow up all that! Many design firms have fully embraced this intelligent process based on 3D models that is revolutionizing the way buildings, infrastructure and technical networks are planned, designed, created and managed. Large companies have not yet fully adhered. We are taking the turn! »
Bertrand Grosse, President of Léon GROSSE


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