Congress Street Bascule Bridge Reconstruction
Bibliographic record
Abstract
The Congress Street Bascule Bridge is one of the few four leaf bascule bridges in the country and is located on a major route that serves the Chicago Loop. The bridge was completed in 1954 and spans the South Branch of the Chicago River. In 2010, the Illinois Department of Transportation (IDOT) embarked on a major rehabilitation of the movable bridge superstructure as well as the electrical and mechanical systems. Walsh Construction Company of Chicago Illinois (Walsh) was awarded the work for the project. Because of the complexity of construction work, IDOT required the contractor to retain the services of a Movable Bridge System Coordinator to work with the contractor to verify that all aspects of the work resulted in a fully operational bridge that met the requirements of the project specifications. Collins Engineers Incorporated of Chicago (Collins) was selected by Walsh to perform this work. The authors discuss the construction engineering design and construction techniques required to rehabilitate a movable bridge structure of this size and complexity. The construction engineering aspects of the work include modeling the truss under various stages of demolition and erection to determine stability and to ensure that there are no overstress conditions during the work, temporary jacking struts to replace load carrying members, pull down procedures prior to placing the leaf in operation, evaluation of crane loadings, bridge balancing both for temporary conditions and final completion, live load and anchor column adjustment, coordination of shop drawings and other submittals, and other temporary works required to complete the construction. The work required the close coordination between IDOT, the designer PB Americas, Walsh and Collins to complete the work efficiently.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.004 | 0.001 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.095 | 0.017 |
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".