New Bridge for the St. Lawrence - Review of the concept proposed by Mr. René Therrien to replace the Champlain Bridge - Long text descriptions

Figure 1 — Stage 1

The completed Stage 1 cross-section for the approach spans is shown in Figure 1. It illustrates the first stage of construction where all traffic is maintained on the existing bridge, which is comprised of three lanes in each direction, while new independent spans are constructed adjacent to both sides of the existing bridge. New piers are constructed adjacent to the existing piers on each side to match the existing span lengths. Each new deck superstructure utilizes three trapezoidal steel box girders and accommodates three traffic lanes in each direction. New exterior support beams are added to the existing approach spans and the new piers and deck sections are tied together to provide additional capacity and residual life to the existing spans. Similarly, the main steel truss spans and piers are widened and strengthened to provide additional capacity.

Return to Figure 1: Stage 1 of the Memorandum

Figure 2 — Stage 2

A cross-section of the completed Stage 2 approach spans is shown in Figure 2. The second stage involves the relocation of all traffic to the new three lane exterior spans completed in Stage 1, carrying out rehabilitation and strengthening works on the existing approach and truss spans and then returning two lanes in each direction of truck-restricted traffic as well as one service lane in each direction to the existing structure.

Return to Figure 2: Stage 2 of the Memorandum

Figure 3 — Stage 3

A cross-section of the completed Stage 3 approach spans is shown in Figure 3. The reconstructed central portion would be reserved for the proposed Agence métropolitaine de transport (AMT) GRT transit system as well as one lane in each direction of truck-restricted traffic linked to Highway 15 only. The approach spans would be reconstructed with trapezoidal steel box girders to match the previously constructed widened portions and would be supported on steel beams spanning between the piers constructed for the widened portions. The existing piers of the central portion would remain in place but no longer support the structure.

Return to Figure 3: Stage 3 of the Memorandum

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