Metropolitan Council, Minneapolis East Interceptor Control Gate Rehabilitation Site 26 Drop Shaft and Sloped Pipe

Project Location
Minneapolis, MN
Construction cost
$250,000
Construction Start/End
1/2023 - 3/2023

Details

When was it constructed and how long has it been in service:
Constructed in 1972. In Service for 52 Years
Dimensions:

96’’ RCP  - 27 LF drop w/ (2) 45-degree bends
30 VF of Irregular Trapezoid Drop Shaft (12’3” x 9’6” x 6’6”x 7’9”)

Depth of pipe:
36'
Depth of ground water:
40'
Health and safety:
No Issues
Has any re-inspection been performed? What was the condition of the pipe?
1 Year Warranty Walk Through Inspection. No Issues noted.
References

Chuck Lewis P.E.
Brown and Caldwell
clewis@brwncald.com
651-341-1606

Methodology

Ventilation and odor control used:
Forced Supplied Air Ventilation
Rehab method used:
50% Flat and 50% Spiral Wound
Cleaning method used (if required) and who cleaned the line:
Hydro-blast concrete surface by PCiRoads
Method of flow bypass or diversion, if used:
Flow was diverted upstream of work area with stoplogs. 20,000 GPM

Hurdles

Problems encountered during construction:
Spiral winding the Danby liner in steep slope of 96’’ RCP through (2) 45 degree bends and horizontal curve was challenging but was accomplished by securing a ladder for support in the slope. Winter in Minneapolis, MN was below freezing, the material was warmed prior to installation.
Problems encountered after construction:
N/A