Foundation Underpinning
Ensuring the Proper Foundation Underpinning Method Is Utilized
Dig Deeper With FNA’s Foundation Underpinning Solutions
In extensively built-out urban areas like NYC, the solution to limited space for construction projects is often to dig deeper into the ground. These projects frequently require excavations to stretch below the existing footing of neighboring structures, which further complicates an already complicated process. For over 30 years, FNA has provided our clients with constructible, creative, and cost-effective foundation underpinning designs.
Our engineering solutions and underpinning methods ensure the protection and permanent support of adjacent existing foundations during and after construction. Our expertise and experience with different types of underpinning methods enable us to find appropriate solutions for several kinds of structures in numerous soil and ground conditions. And we specialize in navigating the difficulties of constructing near MTA structures and underground infrastructure.
What Underpinning Foundation Method Is Right for Your Project?
Underpinning can serve many purposes. The method of underpinning FNA’s structural engineers recommend is based on many factors. The most common reasons for reinforcement are:
- Foundation repair
- Adding depth to an adjacent foundation
- Adding a basement to an existing building
- Extending foundations to transfer the load of a structure to soil strata with higher bearing capacity.
- Correcting uneven settlement
- Increasing loading
Depending on the purpose of your project, you may require one of these underpinning foundation methods:
Mass Concrete Underpinning
Mass concrete underpinning, also known as the pit method or mass pouring, is the traditional method of underpinning. This technique involves extending an existing foundation to a stable stratum and filling the excavated area with concrete and supplemental materials. FNA uses this cost-effective and simplistic foundation underpinning method for straightforward projects. If you require an extensive foundation depth, pier and beam underpinning may be appropriate. This technique uses reinforced concrete beams to transfer loads to mass concrete bases or piers.
Pile Underpinning
The piled method of underpinning involves driving piles along each side of a wall that needs strengthening. Needles or pins are then penetrated through the wall and connected to piles. This underpinning foundation method is most suitable for clay-based soils, insufficient bearing strata, and waterlogging. For sites with variable soils, restricted access, and environmental pollution concerns, mini piled underpinning should be given more significant consideration.
How FNA Utilized Foundation Underpinning Methods
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30+
Years In Business
500+
Excavation Projects Completed in NYC