Rebuilding of the walls and floor of the Champlain dry dock of MIL Davie (Lévis, Quebec)

Work to be performed: concrete stripping of walls and drilling of dowels in walls and floor.

Period: June to November 2001

Challenges and special requirements:

• Great precision was required to protect the granite steps and keep stripping depth to a minimum, thus reducing resurfacing costs
  
  
• Stripping had to be done from the top and the bottom over a 50-foot high vertical plane
  
  
• Methods had to be devised to work around obstacles and compensate for the reduced visibility of the work area when working from the top down
  
  
• Vibrations and striking energy were a consideration when selecting the chisels
  
  
• Deadlines could not be exceeded.

Equipment used:

• Guiding frame with concrete machining tool
• Hydraulic drilling autonomous tilting platform
• CAT E120B excavator with hydraulic chisel
• CAT E120B excavator with pneumatic drill
• KX-41 excavator with pneumatic drill