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

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Hello Ghislain Quenet, What path has allowed you to join Léon GROSSE as a BIM manager ?

Engineer training IS P, I had been able to do an end-of-studies internship at GTOI (Great Works of the Indian Ocean) (subsidiary of COLAS in the French overseas departments and territories) within the Technical Department in order to carry out the following mission: "Ensure the transition of the Methods department into a BIM process". I learned there to model on Revit, to briefly train myself on the methods, to master the tool Navisworks (more particularly the TimeLiner).

I then moved to London for my first job as a BIM Coordinator at Bouygues UK. I was in charge of carrying out clash detections for an office project on 8 levels " Hounslow Civic Center ". I 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 also able to train myself on Dynamo and to a lesser extent on 3Ds Max for some realistic renderings. It was during the spring of 2016 that I was contacted by Léon GROSSE for this new challenge as BIM Manager Rhône-Alpes, a position that never ceases to fascinate me.

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

In June 2015, Bertrand Grosse was appointed Chairman of the Management Board and launched a new project for the company to become "More reliable, more fluid, more human, more innovative". The objective is to develop the company to enable it to meet the current and future challenges of the profession. This is reflected in a strong digital transition and wide diversification.

A strategic plan has therefore been put in place to achieve this objective: “Ambitions 2020”. On the “innovative” aspect, and in particular that of BIM, the “100% BIM” approach was launched in early 2017. The objective is clear: By the end of 2020, BIM must be used as well in studies as in under construction on all our projects.


How did you initiate the deployment of BIM at LG?

Léon GROSSE began his adventure with BIM in 2013 when the first digital models were created for very technical and very complex projects such as the construction of the Jean Bouin Stadium. Through in-house training but also by welcoming new profiles through end-of-study internships, Léon GROSSE began to see the creation of a team of specialists trained and interested in the subject of BIM in general. 

On the strength of these first experiences, the Digital Hub was able to see the light of day (currently headed by Mickaël PAPAZIAN). This pole, based in Île-de-France, aims both to coordinate BIM actions across the national territory, to centralize the knowledge of each employee, to communicate and to be constantly on the lookout for news. technological advances related to BIM.

Could you tell us a little more about the Oxaya pilot project?

The Oxaya pilot project, the creation of an office building spread over 4 levels (7 m² of SU) and 150 parking levels, is part of this process of developing BIM at the national level. In 2, it was decided, in consultation with the contracting authority, 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 as many BIM-related applications as possible that can involve as many stakeholders as possible on the project (project management, project management, studies, companies and site team).

The first actors involved in this process were:

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

The companies and design offices involved in the EXE and DOE phase were as follows:

  • The structural design office CEH
  • The HVAC and Plumbing Company ORIOLE
  • Electricity company ROIRET Energies
  • The design office CEBATEC (3D modeling mission of technical lots)
  • The exterior joinery company SNMA
  • The company SAPA, manufacturer of aluminum joinery for exterior joinery (supply of 3D families of different types of exterior joinery)
  • The company Léon GROSSE (internal modeling of architectural lots in relation to the architect)
  • The company BIMly (technical assistance and creation of the DOE model)
  • The company Leica (supply of the Total station)
  • The company Resolving (supply of the "tablet" solution)

The technical and architectural synthesis unit was provided by Léon GROSSE and made up of the BIM Manager, a specialist in technical synthesis and a specialist in architectural synthesis.


Concretely, how did you go about implementing BIM in this project?

After a meeting with the project management to present the fundamental principles of BIM and the project's BIM convention on the common rules to be adopted, the modeling period for 3D PRO models followed, interspersed with model coordination meetings for address different design points observed during the compilation of the different models. At the end of the PRO, the new step was to find the companies that would follow us in EXE in the continuity of this BIM process.

This done, the PRO models were sent to 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 agreed that these models, both in design and execution, would be produced on REVIT. The formwork plans could be extracted directly from the models as well as the network plans and terminal plans. 

The technical and architectural synthesis was carried out via Navisworks Manage and the results were either presented in Navisworks or in Revit via sections. At the end of each summary meeting session, a Summary mock-up was distributed to companies containing the various points and actions to be carried out discussed in the meeting. The synthesis on the whole project lasted 4 months, which is remarkable considering that it was a new way of working for all involved.

Following this, the architectural lot model could be improved, clarified and informed and include the exterior joinery modeled in the form of REVIT families.

The last step was to compile all the DOEs from the different batches and produce a fine, global mockup that would contain all the attached files in order to make a digital DOE. This DOE was then transmitted to the contracting authority, putting an end to the project's BIM mission.


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


The other objective was to include the Methods Department in this first BIM project. Strong of several 3D PIC and 3D phasing rather carried out in the Call for Tender phase, the Methods Department wanted to use its skills in Revit and participate in the production of Methods files for the site. 

This project was therefore an opportunity to use the tools and 3D objects created by the Digital Center, to lay the foundations on the notions of cycles, rotations and gangway plans in order to create his own project template "Léon GROSSE - Methods ".


How did you transport BIM to the site and what were the use cases?

It was out of the question not to bring the BIM model to the site! In addition to regularly participating in 3D synthesis meetings, the various members were able to take advantage of certain everyday applications using the model:

  • Stakeout of points on site via the total station: the plan views of the project were imported in DWF into the station. The site manager then designated the point he wished to set up and by means of 3 terminals located at 3 different locations in the project, the station automatically positioned the point via the laser.
  • Using the tablet for the remarks and remainders to be made: the model was deposited on a server connected to the tablet. The works supervisors could go to the site with the tablet and have all the 2D plans and the 3D view to be able to make their observations and ultimately issue a leftover report to send to the companies concerned.
  • Extraction of quantities : quantity extractions could be made from Revit to meet various requests.


A successful first project is worth any BIM project!

The important thing is to find motivated people, who 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 if you have found these companies then the project is bound to go well. Because, obviously, errors and problems can happen. But if the different actors go ahead and never back down this mountain that BIM can be, the project cannot be a failure.

Being a BIM Manager also requires a lot of rigor when it comes to respecting processes, respecting common rules, verifications, monitoring changes, etc. In this project, some people did not necessarily have several BIM projects to their credit before. to start OXAYA. But they held on and were always eager to learn new tricks to gain in efficiency and precision. 

The priority is people. The models will follow!


A major player in construction in France with more than 2 400 employees et a turnover of more than 800 million. For 137 years, Léon Grosse has taken up major architectural and technical challenges: renovation and expansion of the Geoffroy-Guichard stadium in Saint-Etienne (2014), Jean-Bouin stadium in Paris (2013), satellite 4 of Paris-Charles airport -de-Gaulle (2012), Aix-en-Provence TGV station (2001), tour of the European Parliament in Strasbourg (1998), renovation of the National Museum of Natural History in Paris (1995), coverage of the platforms of the Lyon-Saint-Exupéry TGV station (1992) or the Super-Italie tower in Paris (1974).

100% entrepreneurs, Léon Grosse is involved in most construction activities: general contracting, structural work, building trades, engineering and major projects, real estate development, nuclear civil engineering, energy and the rehabilitation of social housing on occupied sites. Léon Grosse is positioned as a global construction company.


“The business world is on the move, mentalities are changing and this is a unique opportunity to break down the blockages and received ideas about our businesses. Precisely, the BIM will explode all that! Several design offices have completely adopted this intelligent process based on 3D models that is revolutionizing the way buildings, infrastructures and technical networks are planned, designed, created and managed. Large companies have not yet fully embraced. We are turning the corner! »
Bertrand Grosse, Chairman of Léon GROSSE

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comments (1)

This comment was made by the moderator on the site

Thanks for the article. Interesting to read.

Bastien JEAN
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