WAPITI BRIDGE CULVERT RESTORATION SCOPE.pdf
PDF 231 KB Posted
- Attached to
- S. Wapiti Culvert Repair
- Solicitation number
- 2025 - S. Wapiti Culvert Repair
- Issued by
- Grand County, Colorado
About this file
The Wapiti Bridge Culvert Restoration Scope is a detailed technical document for a culvert restoration project, likely for a local government or public works department in Colorado. The scope of work outlines a comprehensive restoration process for multiple river culverts, specifically focusing on culvert #3, which involves mobilizing to the site, diverting river flow, removing sediment and debris, cleaning and preparing culvert surfaces, and performing extensive grouting and restoration work. The project requires the contractor to carefully access river culvert inlets and outlets while avoiding disturbance to existing wetlands and vegetation, ensuring structural stability during construction.
The technical specifications include precise requirements for grouting, surface preparation, and riprap installation, with specific details such as using a minimum 4,000 psi grout mix, applying waterproof sealant, and installing grouted riprap with cobblestone (d50 = 12"+) at culvert inlet headwalls. The contractor must follow strict guidelines for cleaning, grouting voids, applying corrugation cover, and extending headwall riprap below the historical streambed elevation. The scope emphasizes environmental considerations, water course safety, and meeting project engineer and town satisfaction, suggesting a detailed, environmentally conscious infrastructure restoration project with specific technical and procedural requirements.
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Text version
WAPITI BRIDGE CULVERT RESTORATION SCOPE
1. Mobilize to site and access river culvert inlets and outlets for restoration work.
access shall avoid disturbance and/or damage to existing wetlands and vegetation.
2. The contractor is responsible for the stability of the structures during construction.
3. divert river flow to alternate culverts to allow work in each culvert in a “dry” state.
4. The contractor shall remove all sediment and debris from inside the culvert and clean the entire limits of the work area with high pressure water jet, wet sand blasting, or dry sand blasting. in culvert #3, trim or sawcut significantly deteriorated and weakened steel areas. The prepared surface shall be free of rust flakes to the satisfaction of the project engineer and the town.
5. All material generated as a result of cleaning and preparing the existing culvert shall be removed by the contractor and deposited offsite from the project.
6. The contractor shall inspect and grout all voids behind the existing culvert invert up to the midpoint height of the pipe circumference. The contractor shall sound the pipe for voids and core hole for grout installation as required.
7. The contractor shall gravity flow grout into all voids in the bottom half of the sidewalls and pipe invert. consolidate using vibratory or mechanical means as necessary.
8. The grout mix design shall be minimum 4,000 psi, 4.5%-7.5% air entrained.
9. openings at grout entrance points, perforations in steel culvert, and culvert joint separations shall be grouted flush to the corrugation peak of the existing CMP and troweled smooth.
10. At culvert #3, apply grout corrugation cover as an invert paving application minimum 1.5” thick over the entire length of the culvert and to the high-water mark at the sides.
11. Contractor shall ensure appropriate temperature conditions or river-safe spray curing compound for proper grout curing in compliance with manufacturer or American Concrete Institute requirements.
12. Apply waterproof sealant over the edge of the installed grout, covering the transitions from grout to steel. Sealant shall be appropriate for use in water courses and be approved for use prior to placement.
13. Contractor shall grout culvert pipe inlet/outlet perimeter voids.
14. Install grouted riprap at culvert inlet headwalls. use imported or site sourced cobblestone riprap d50 = 12”+. shape riprap armoring to prevent embankment erosion, inhibit seepage around culverts, and direct water flow into the culverts.
extend headwall/apron grouted riprap to a point 12”+ below the historical streambed elevation.
File details come from the government source that posted it. Updated .