Samuel Jarry

Working at the interface between the specifications and assembly of the scaffolding, the design office engineer coordinates the teams in charge of designing the structure.

  • Coordinates the work of the calculations engineers 
  • Identifies problems and solutions while minimising financial costs
  • Draws the plan of the structure

Before starting a project as colossal as the restoration of the Royal Chapel, a list of specifications is drawn up. This is a complex but fundamental process that plans every stage of the project according to a precise schedule, taking account of the different professions and the order of their tasks.

How can we guarantee the load-bearing capacity required to move the stone sculptures? How can we access the framework without resting on the fragile vault of the Chapel roof? How can we design a safe, modular structure to allow for unforeseen complications while limiting costs? The design office engineer must ask all these questions and find shrewd answers.

Load-bearing capacity : how to guarantee a sound, functional structure 

The structure’s solidity and ability to hold heavy parts was a real test of ingenuity during the design phase. In the case of the Royal Chapel, a three-tiered solution was found.

The first section, called the “foot”, rests on the ground. After a certain height, the structure’s load must be spread and supported by other points. In this case, it could not rest on the roof because the framework was going to be removed, so the second section (intermediate section) is supported by the covering for the lower part using metal tubes that constitute big iron beams. These allow the different scaffolding links (or levels) to be built close to the walls of the nave.

The final section is, without doubt, the most complex. To allow access to the interior of the framework without touching the ceiling of the Chapel, it was decided to build a structure above the roof that the different parts of the scaffolding could be suspended from.

Head Assembler

Episode I - The scaffolding

Challenges

Calculating the load-bearing capacity

“The unique thing about the works project for the Chapel is that we had to allow for additional heavy loads during the removal of elements from the building’s facade. These loads could weigh as much as 600kg per m².”

— Samuel Jarry - Design Office Engineer

Coordinating the teams

“The calculations required to design a structure that meets all of these objectives needed clever coordination of the teams of engineers, and the work of all the participants had to be combined together to find the right overall solution.”

— Samuel Jarry - Design Office Engineer