Three Démex employees attaching elements of the structure to be taken down
Bottom to top view of the pylon
Partially dismantled pylon in the middle of the St Lawrence river
Metal structure taken down onto a barge on the river
Moving equipment on a barge on the St Lawrence river
A Démex employee cutting elements of the structure
Bottom to top view of the pylon showing the scaffolding used and a crane at the top
Metal structure taken down onto a barge on the river

Total Dismantling of two Pylons in the Middle of the St. Lawrence River, QC

Located in the middle of the river at the Deschambault-Grondines level, this particular challenge involved complex work for which we developed an innovative methodology which made it possible to shorten the timeline and reduce costs. The planned equipment, some of which was custom-made, was assembled and tested on the ground to assess and mitigate risks. The assembly of the hydraulic scaffolding, the 20-t crane truck, the hoist mast and the electric man-lift was successful. Interestingly enough, the upper part of one of the two pylons was dismantled to be assembled and re-erected at La Cité de l'Energie in Shawinigan.

SERVICES PROVIDED:

  • Total dismantling
  • Metal Reclamation/Recycling
  • Waste management
  • Structural engineering
  • Consulting services

VARIOUS CHALLENGES:

  • Strict HSE requirements
  • Complex logistics
  • Environmental protection
  • Very tall structures (142 m)
  • Coping with variable weather conditions (wind, rain and lightning at heights)
  • Dust management

 

Cité de l’énergie de Shawinigan

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