Temporary Bridges

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.

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.

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.