• Temporary truss bridge set by mobile crane at night, Autoroute 40
  • Temporary truss bridge resting on its temporary supports

Temporary Bridge Design

Keeping a road link open while the permanent structure is built or demolished. Span, load class and service life drive the choice between a rented steel structure, an assembly built from existing components, or a bridge designed for the site. Then come the supports: temporary abutments, intermediate bents, and the bearing capacity of the ground beneath them.

  • Temporary abutments and supports
  • Rented, assembled or purpose-designed structures
  • Bearing capacity verification of the supports

Bridge Launching

When the site leaves no room for a crane under the span — a watercourse, a rail line, a highway in service — the deck is pushed out from the abutment. The method turns on the support reactions at every stage of the push, on the launching rollers, and on the deflection of the cantilevered nose. We provide the full sequence and the site follow-up.

  • Launching method and sequence
  • Launching rollers and lateral guidance
  • Monitoring of reactions and movements
  • Temporary bridge deck pushed over the river, launching nose cantilevered ahead
  • Temporary bridge deck advancing during the push, crew on site
  • Roller supports and lateral guides under the deck during launching
  • Temporary truss bridge in place on its supports after launching
  • Compact loader and construction materials on the deck of a bridge in service
  • Container, machinery and materials on an overpass deck, traffic maintained below
  • Equipment and materials stored on a ramp deck during the work
  • Aerial view of a ramp under construction with equipment on the deck

Construction Overload Analysis on an Existing Bridge

Running a crane, a heavy hauler or a convoy over a structure that was never designed for those loads. The analysis compares the induced forces to the real capacity of the structure in place and sets, where needed, the position, speed and distribution restrictions that make the crossing acceptable.

  • Capacity verification under construction loading
  • Traffic restrictions and load distribution plan
  • Crane positioning on an existing structure