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Helical or Screw Pier

A helical pier, also known as a helical pile, screw pile, or helical anchor, is a foundation support structure used in construction to transfer loads from the surface to deeper, more stable soil or bedrock. It consists of a helical-shaped steel plate or helix that is attached to a steel shaft. The helix allows the pier to be screwed into the ground with minimal disturbance to the surrounding soil.


Helical piers are commonly used in situations where traditional foundation systems may not be suitable or cost-effective. They are often employed in areas with poor soil conditions, such as loose or sandy soils, as well as in retrofitting projects where additional foundation support is needed.


The installation process typically involves using specialized equipment to screw the helical pier into the ground until it reaches a stable soil layer or bedrock. The structure being supported is then transferred onto the helical piers, providing a stable foundation.


Helical piers are versatile and can be used in various applications, including residential, commercial, and industrial construction. They offer advantages such as ease of installation, minimal environmental impact, and the ability to provide immediate load-bearing capacity.

helical pier
Helical piles or screw piles

How deep do helical piles go down?

The depth to which a helical pile goes down can vary depending on several factors, including the specific engineering requirements of the construction project, soil conditions at the site, and the load-bearing capacity needed.


In general, helical piles are often installed until they reach a stable soil layer or bedrock that can provide the necessary support for the structure. The depth can range from a few feet to tens of feet or more. It is not uncommon for helical piles to be installed to depths of 20 feet (6 meters) or deeper.


The installation depth is determined by factors such as the soil type, the structure's load requirements, and the desired level of support. Engineers typically conduct soil investigations and analyses to assess the subsurface conditions and design the helical pile system accordingly.


It's important to note that the depth of installation is a critical aspect of ensuring the stability and load-bearing capacity of the helical pile foundation. Professional engineers and geotechnical experts are involved in the design and installation process to ensure that the helical piles are placed at the appropriate depth to provide the necessary support for the specific project.

Installing helical pile under an existing foundation.
Helical piles can be used to support existing floors.

How many helical piles does my project need?

The number of helical piles needed for a project depends on several factors related to the specific requirements of the structure and the soil conditions at the construction site. Professional engineers typically perform a thorough geotechnical analysis and structural design to determine the optimal number of helical piles.


Factors that influence the determination of the number of helical piles include:

1.     Load Requirements: The total load that the structure needs to support plays a crucial role. The greater the load, the more helical piles may be required to distribute the load adequately.


2.     Soil Conditions: The type and characteristics of the soil at the site are essential. Different soils have varying load-bearing capacities, and the soil's ability to provide support influences the number and depth of helical piles needed.


3.     Site-Specific Conditions: Site-specific conditions, such as slope, groundwater level, and seismic considerations, can impact the design. For example, in areas prone to seismic activity, additional piles may be required for stability.


4.     Structural Design: The structural design of the foundation system also influences the number of helical piles. The configuration and layout of the structure, as well as the distribution of loads, are considered in the design process.


5.     Helical Pile Specifications: The specifications of the helical piles themselves, including their size, diameter, and load capacity, are important in determining the appropriate number for the project.


To accurately determine the number of helical piles needed, it's essential to consult with a qualified geotechnical engineer or structural engineer. They will assess the specific conditions of your project and design a foundation system that meets the structural and soil requirements.

Are you planning to install Helical Piers?

Contact our team for a free estimate.

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