Project Title and Limits
Project Title: Structural Renewal of Bridges SN873100, SN897140 & SN897170 and Culvert SN898800
Project Limits: The structures and their approaches for the Church Street Bridge (SN873100) and Etienne Road Bridges and Culvert (SN897140, SN897170 and SN898800)
General Project Description
Church St Bridge (SN873100)
Church St Bridge (SN873100) is a single-span reinforced concrete rigid frame with a clear span of 15.2 m and an overall width of 11.0 m. The structure was built in 1962 and spans over Stevens Creek. The structure is generally in fair condition. The extensive disintegration, heavy contamination of chlorides, high corrosion potential of the deck top, and the other notable defects, need to be addressed in order to prevent further deterioration of the structure.
The 2014 OSIM inspection and the following detailed condition assessment by Morrison Hershfield in 2015 revealed the bridge is in ‘fair’ condition. Major deficiencies reported include; no waterproofing membrane over the deck, which likely accounts for the severe chloride contamination exhibited in the deck top; disintegration with exposed reinforcing and medium to wide cracks throughout the sidewalk and curb; medium to severe scaling and disintegration with exposed rebar throughout the west deck cantilever and fascia; and settlement of approaches.
Etienne Rd Bridge (SN897140)
Etienne Rd Bridge (SN897140) is a 6.1 m span by 2.1 m rise reinforced concrete frame crossing Becquith Creek Municipal Drain (MD). The structure was constructed in 1956 and is 12.1 m long with a depth of cover of approximately 0.44 m. The structure is generally in ‘poor’ condition and programmed for life-cycle repairs based on a risk and criticality assessment.
According to the site inspection completed by Stantec on September 29, 2015 and the latest OSIM inspection completed by AECOM on July 12, 2018, the structure is in ‘poor’ condition due to a wide diagonal crack in west abutment; and severe scaling, disintegration, delamination and spalling of the abutment walls and exterior soffit. These deficiencies do not pose a significant risk to the structure’s current performance and it is the City’s intent to maintain the culvert with minimum repairs as a holding strategy until full replacement.
A Condition Assessment and Renewal Option Analysis report was completed by Stantec in 2016, which recommended that concrete repairs be undertaken on the existing structure (Option 2). However, recommended enhancement works under Option 2 (guide rail installation, gabion basket retaining walls, etc.) for the low volume road structure have been excluded from the scope since AMB would like to proceed with a minor renewal to address material deficiency at this time as a holding strategy in order to postpone replacement.
Etienne Rd Bridge (SN897170)
Etienne Rd Bridge (SN897170) is a 3.1 m span reinforced concrete frame with an average rise of 1.82 m and crosses Becquith Creek MD. The structure was installed in circa 1965 and is approximately 9.75 m long with an average depth of cover of approximately 0.3 m. The structure is generally in ‘poor’ condition and programmed for rehabilitation based on a risk and criticality assessment.
According to the site inspection completed by Morrison Hershfield on August 16th, 2018, and the OSIM inspection completed by Parsons on July 13th, 2017 the structure is in overall ‘poor’ condition, however, severe scaling of the abutment walls and soffit were large contributing factors in the overall condition rating and do not pose a significant risk to the structure’s current performance. Major deficiencies include areas of severe scaling on the abutment walls, soffit interior, and soffit ends, and exposed deck top ends with localized light erosion of the abutment walls at the water level.
A Condition Assessment and Renewal Options Analysis report was completed by Morrison Hershfield in 2018, which recommended that the existing structure be replaced with a 3000 mm x 2100 mm precast concrete box culvert (Option 3), however, AMB has chosen to proceed with a holding strategy (Option 1 – do minimum) at this time to postpone full replacement.
Etienne Rd Culvert, (SN898800)
Etienne Rd Culvert, (SN898800), is a 1100 mm Ø corrugated steel pipe (CSP) on the D. Legault Municipal Drain. Built in circa 1980, the culvert has an approximate length and fill depth of 15.25m and 1.4m respectively.
The 2015 inspection by REMISZ revealed that the culvert is in ‘poor’ condition, having medium to severe corrosion below waterline and a separation in the south extension joint with fill infiltration. REMISZ recommended the replacement of the culvert.
Disclaimer
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