Rehabilitation Works for Pinawa Bridge Over Winnipeg River
Bibliographic record
Abstract
The Pinawa Bridge over Winnipeg River near Pinawa, Manitoba, built in 1961, is a vital link to the community of Pinawa, the Manitoba Hydro Pointe du Bois Generating Station, and AECL’s Whiteshell Laboratories. The structure accommodates two traffic lanes on four 42.7m main spans and two 30.5m approach spans. The bridge superstructure comprising of five steel plate I-girders and reinforced concrete deck, is continuous over the piers with hinges in spans 3 and 5. Finger plate expansion joints above the hinges accelerated deterioration of the underlying deck soffit, steel girders, and pin-hanger system. Rehabilitation works were required to extend the remaining service life due to deterioration of several key components. The major rehabilitation work items included: 1. Replacing existing pin-hanger connections with girder continuity splices to make the bridge fully continuous; 2. Replacing existing rocker bearings with pot bearings to accommodate the change in behavior of the superstructure; 3. Constructing a partial depth deck replacement, widened to current geometric design standard; 4. Installing girder cover plates to increase the design live load and to enable deck widening; and 5. Associated road works to accommodate widened bridge geometry. The project presented challenges to Manitoba Infrastructure and Transportation (MIT) and to the design team in ensuring that the rehabilitation works occurred in accordance with the design and staging requirements. Challenges encountered during construction works included: 1. Staging of construction works to maintain at least one traffic lane at all times; 2. Installing continuity splices in areas of severely corroded and/or distorted girder steel; 3. Reviewing contractor’s staging techniques to allow concurrent continuity splice installation and deck demolition works; and 4. Completing staged partial depth deck construction in Manitoba winter conditions and constructing the widened deck section profile. The rehabilitation works were completed successfully and will increase the bridge service life by 40 years and meet current design standards.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.011 | 0.001 |
| Scholarly communication | 0.002 | 0.000 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.019 | 0.002 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".