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Projects |
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Environmental
Structures
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North River Water
Pollution Control Plant, New York City, NY
FKC, in a joint
venture, was responsible for the structural design of the North
River water treatment plant. This unique facility, a 220 mgd
secondary sewage treatment plant, designed to treat half of
Manhattan's sewage, is built atop a caisson and pile-supported
structural platform over the Hudson river. The 30 acre roof that
is constructed of post-tensioned precast concrete slabs, supports
a community park and recreation area that includes a stadium,
swimming pool, playing fields, restaurants, and other recreational
facilities. This is one of the largest post-tensioned concrete
projects in the USA. This project has received the Presidential
Federal Design Achievement Award from the National Endowment For
the Arts, and the City Club of New York Albert S. Bard Award of
Merit in Architectural and Urban Design.
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Water Tank,
Albertson Water District, Albertson, NY
This 1.5 million
gallon buried prestressed concrete water tank suffered extensive
deterioration at the top of the tank walls when the protective
earth cover was removed. The thermal movements of the roof slab
damaged the walls. FKC investigated the structural behavior of
the tank and designed repair details. The top of the tank wall
was sawcut and shimmed. The roof slab was lifted up using flat
jacks, and a neoprene pad was inserted between the roof slab and
the tank wall. Thus, the thermal movements of the roof slab were
accommodated so as to minimized future damage to the tank walls. |
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Water Tank,
Westbury Water District, Westbury, NY
The reinforced
concrete roof slab of this 120 ft diameter water tank exhibited
extensive cracking and concrete spalling. FKC investigated the
structural integrity of the concrete slab. Impact-Echo testing
revealed that over 50% to 60% of the concrete slab areas were
delaminated. Concrete cores verified the slab delamination.
Laboratory tests indicated low concrete strength and sulfate
attack, evidence of alkali silica reaction. An engineering report
with findings, conclusions and recommendations was issued.
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Baldwin Water
Treatment Plant, Cleveland, OH
This reinforced
concrete water treatment plant facility was constructed circa
1920. FKC investigated the structural condition of the
reinforced concrete roof slabs, spandrel beams, and columns. FKC
performed a condition survey, testing of the concrete members, and
half-cell testing of reinforcing steel to detect corrosion
activity. Impact-Echo testing revealed that approximately 70% of
the concrete roof slab area contained numerous microcracks.
Concrete cores verified the presence of microcracks and poor bond
between the coarse aggregates and the cement paste. Petrographic
examination of concrete cores was performed. FKC recommended
several rehabilitation alternates. |
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Wards Island Water
Pollution Control Plant, New York City, NY
FKC investigated the
structural integrity of the Wards Island digester tanks, and
performed a feasibility study whether the existing tanks could be
operated under thermophilic conditions (135° F). The digester
tanks were operated under mesophilic conditions (90° F). There
are six digester tanks and two gas extractor tanks. FKC performed
a condition survey and testing of the reinforced concrete
structures including chemical and petrographic examination.
Impact-Echo testing was conducted in order to determine possible
concrete delaminations or voids. FKC performed analytical and
finite element studies to investigate the effects of temperature
changes in the stress level of the dome structures.
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