Amendment W912WJ23Q0108-0002_Attachments.pdf
PDF 7 MB Posted
- Attached to
- Concrete Repairs, Everett Dam, Weare, NH
- Solicitation number
- W912WJ23Q0108
About this file
This document package includes photos, figures, and repair details for concrete repairs needed at the Everett Lake Dam in Weare, New Hampshire. The scope of work involves repairing cracks, spalls, voids, and other defects in the concrete structures of the dam's weir boxes, intake tower, conduit transition ceiling, and access bridge pier. The repairs range from 2 to 6 inches deep and encompass approximately 126 square feet of material removal and replacement. Figures and details provide location information and specifications for repair methods. The related federal contract opportunity is solicitation number W912WJ23Q0108 from the Department of the Army Corps of Engineers Engineering District New England for completing the concrete repairs according to the scope of work.
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Other files
| File | Type | Posted |
|---|---|---|
| Amendment W912WJ23Q0108-0002.pdf | ||
| Amendment W912WJ23Q0108-0001.pdf | ||
| Solicitation W912WJ23Q0108.pdf | ||
| Specifications and Drawings.pdf |
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Text version
Everett Lake Dam Concrete Repairs
U.S. Army Corps of Engineers
Everett Lake Dam Flood Control Project
Weare, NH
Scope of Work Photos, Figures, and Details
July 2023
PHOTOS
Photo 1: Overview of Everett Lake Dam Showing Work and Staging Areas
Photo 2: Control Weir Box at Upstream Side of Everett Lake Dam Showing Approximate Repair Areas
Bottom of West Wall
Scour Gouge/Void
Bottom of Stop
Log Guide
Spall/Gouge
Bottom of North
Wall Slab Scour
Stop Logs, TYP for all
Weirs
Photo 3: Control Weir Box – Stop Log Guide Spall/Gouge
24” Tall x 6” Wide x 6” Average Depth +/‐
Approximately 1 SF
Stop Logs, TYP for all weirs
Photo 4: Control Weir Box – Slab Scour at Base of North Wall
4’ Wide x 6’ Long x 3” Average Depth +/‐
Approximately 24 SF
Photo 5: Control Weir Box – Bottom of West Wall Scour Gouge/Void
12” Tall x 24” Long x 3” Average Depth +/‐
Approximately 2 SF
Photo 6: Center Conduit Transition Ceiling Repair Location
4’ Wide x 6’‐6” Long x 2” Average Depth +/‐
Approximately 26 SF
Photo 7: Center Conduit Transition Ceiling Repair Area
Photo 8: Access to Weir Box from Trash Cleaning Platform
Note: Contractor must provide own fall protection measures into weir box as well as own ladders.
Ladder Needed for Access into
Weir Box
Photo 9: Intake Tower Repair Area
Service Bridge
Intake Tower (East
Side Repair Area)
Weir Box Access
Photo 10: Spall on East Side of Intake Tower
Note: Spall may wrap around opening corner.
2’ Wide x 2’ High x 2” Average Depth +/‐
Approximately 4 SF
Photo 11: Crack on East Side of Intake Tower
Approximate upper extent of crack
Approximate lower extent of crack
10‐20mils wide x 10’ Long +/‐
Photo 12: Access Spillway Bridge Pier Repair Location
Photo 13: Access Spillway Bridge Pier Repair Area
Approximately 55 SF +/‐ with an Average Repair Depth of 2”
Repair Area on
Bull Nose
Repair Area on
Spillway Surrounding
Bull Nose
Photo 13: Concrete Spillway Spall Repair
Note: 1. Spall area is located about 15’ SW of access road bridge pier.
2. Tap concrete surface within the repair area and identify unsound hollow sounding concrete. Square off repair area with limit at least 3” beyond hollow sounding area.
3. Remove unsound concrete and repair within the squared off limit. Removal and repair approach to be similar to “Repair to Conduit Transition Ceiling” as shown on Detail 3.
FIGURES
Figure 1: Partial Plan of Outlet Works Showing Weir Box and Intake Tower
Figure 2: Partial Elevation of Outlet Works Showing Wier Box and Intake Tower
FLOW
Figure 3: Plan of Weir Box Showing Repair Locations
Figure 4: Elevation of Weir Box Showing Repair Locations
Trash Cleaning
Platform
Low Water Level Allowed at this Level for Duration of 1 week
Figure 5: Plan of Center Conduit Transition Showing Ceiling Repair Area
Figure 6: Typical Intake Tower Elevation View Showing Repair Locations to Be Repaired on the East Elevation Only
EL. 449.00
Figure 7: Access Bridge Pier Elevation View Showing Repair Location
Spall + 24 SF
Figure 8: New Timber Stop Logs for Weir Box
Note: Stop log timber shall be Select Structural S4S Douglas Fir. Rip to achieve 6” high as noted.
REPAIR DETAILS
Detail 1a: Repair Details for Stop Log Guide Spall/Gouge - 1
Detail 1b: Repair Details for Stop Log Guide Spall/Gouge - 2
Detail 1c: Repair Details for Stop Log Guide Spall/Gouge - 3
Detail 2: Typical Concrete Repair for Weir Box Slab Scour, Weir Box West Wall Scour Gouge/Void, and Access Bridge Pier Repair
TYPICAL REPAIR PATCH BETWEEN 2 AND 6 INCHES DEEP
Detail 3: Repairs to Conduit Transition Ceiling
REPAIRS TO CONDUIT TRANSITION CEILING
Detail 4: Corner Spall Repair to Intake Tower
File details come from the government source that posted it. Updated .