Dealing with the Results of Advanced Inspection Technology—Emergency Rehabilitation of the St. James Interceptor Siphon by CIPP Methods in Winnipeg, Manitoba, Canada
Notice bibliographique
Résumé
This paper outlines the inspection, condition assessment, and rehabilitation of the St. James interceptor siphon crossing beneath the Assiniboine River in Winnipeg Manitoba, Canada. The St. James interceptor siphon, constructed in 1963, services approximately 2,200 hectares of northwest Winnipeg, and conveys peak dry flows of up to 713 L/s. The twin 600 and 500 mm steel siphons were inspected using a number of advanced condition assessment tools including: Sonar in 2012 and remote field eddy current technology (RFEC) in the fall of 2014. After full flow by-passes were able to be put in place in early 2015, CCTV inspections were also conducted to prepare for lining operations. The RFEC inspection was part of a larger program to inspect 19 high risk river crossings throughout the City to quantify failure risk and prioritize for rehabilitation where necessary. The RFEC data gathered during the inspections indicated that portions of the 500 mm siphon had deteriorated to the point of having no effective remaining wall thickness. While the 600 mm siphon appeared to be in much better condition, localized defects were found that were of legitimate concern to its reliability. While the exact cause of the extensive preferential deterioration within the 500 mm siphon is unknown, correlations between the vertical profile of the siphon and the RFEC data indicated the localised buildup of hydrogen sulphide (H2S) within the 500 mm siphon under normal operating conditions due to the presence of a localized high spot in the middle of the river. Whereas the larger 600 mm siphon maintains an air gap along the siphon, allowing it to expel any gas buildup during normal operation of the siphon. The deployment of inspection tools and completion of the rehabilitation work was complicated by the configuration of the upstream sewer system which receives flows from two distinct trunk sewers. A complex gravity flow diversion concept was developed by AECOM and tendered for installation with the rehabilitation of each siphon; permitting each siphon to be isolated individually during normal dry weather flow. Due to the vertical profile, diameter, and length of the siphons (205 m), Cured-in-place-pipe (CIPP) was selected as the preferred rehabilitation method. The siphons have minimal rise on the downstream end (approximately 0.3 m) and the presence of concrete anchors allowed dewatering of the pipes with minimal effort and a low risk of floatation. The use of water inversion/curing processes and a full length temperature monitoring system permitted curing of the liners in a very complex heat sink for CIPP curing. The siphons were successfully rehabilitated in the fall of 2015 under very challenging conditions without incident.
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Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,002 |
| Méta-épidémiologie (sens strict) | 0,001 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,002 | 0,002 |
| Études des sciences et des technologies | 0,003 | 0,001 |
| Communication savante | 0,001 | 0,000 |
| Science ouverte | 0,001 | 0,001 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».