Wastewater Treatment Plant Hunts Point
New York City, USA
Redefining Efficiency and Quality at the Job Site
New Anaerobic Digesters Facilities
Skanska, as part of a joint venture with R.J. Industries, Inc., was chosen to build facilities at Hunts Point Wastewater Treatment Plant in the Bronx. The project includes the construction of four 3.2 million gallon, post-tensioned, cast-in-place concrete digesters. Work includes the installation of cast-in-place concrete, a gas room, a control building, an above-ground digester feed pump station, a guardhouse and walkway bridges. It also includes a range of systems works plus site clearing, excavation and final landscaping.
Building type
Wastewater Treatment Plant
Challenge
Heavy rains, which could affect the concrete placement and curing
Strong winds, which could affect crane operation—thus affecting steel and concrete placement
High daytime temperatures, requiring adjustment of concrete mixes to control curing
Inconsistent concrete mix deliveries, which affect the slipping rate
Solution
To allow for the construction of the monolithic structure, Doka’s Slipform System was the ideal solution because of its flexibility. It involves continuously pouring concrete into the Slipform, which gradually rises as the concrete sets and hardens.
Improving safety and speed: The practical benefits of Slipform technology for the construction of concrete digesters
The Slipform was assembled and dismantled only twice—at the beginning and at the end of the tank wall casting, which eliminated all stripping and resetting of forms common when using a conventional formwork system. All other construction tasks including the placement of concrete, rebar and embedded steel were executed simultaneously with the Slipform process, greatly improving efficiency. Ultimately, the three-shift crews exceeded the scheduled construction times.
Project data
Year of completion
2023
Project duration
Total time to pour 1 tank ranged from 8 to 11 days
Country
USA
City
New York City
Contractor
Skanska RJ Industries HPWWTP JV
Building data
Construction method
Tank
Construction Type / Segmentation
New Anaerobic Digesters Facilities
Overall height
29 m
Tank wall
27 m
Cycle time
Total time to pour 1 tank ranged from 8 to 11 days
three-shift, 24-hour construction operation