Project Challenge:
Rehabilitate a 330-foot-long by 370-foot-wide by 17-fee-tdeep
buried, reinforced concrete 15-million gallon filtered water
tank damaged by high uplift pressures beneath the tank. Uplift
pressures had caused a portion of the tank's two-way reinforced
concrete roof slab to collapse; crushed column concrete; permanently
deformed columns; caused shear cracks in the columns; yielded
column reinforcement; and cracked the mat slab around the perimeter
of the tank. Saving as much of the existing structure as possible
was the key to providing an economical rehabilitation plan.
Project Solution:
K&H performed a detailed investigation of the damaged structural
elements in order to identify the structural elements that were
in satisfactory condition; the elements that required repair;
and the elements that were not salvageable.
A computer model of the structure was also developed to assist
in determining where the structural deficiencies were and which
structural elements needed to be reinforced. Repair details
were developed to seal cracks and strengthen portions of the
mat and roof slab; to repair other damaged elements; and to
rebuild the collapsed roof.
Construction documents provided construction sequencing criteria,
construction load restrictions, and modifications to avoid uplift
on the structure during future dewatering.
OWNER: City of Detroit Water and
Sewage Department
CLIENT: Greeley and Hansen, LLC
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