Helical Piers

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Grengy is a well-known manufacturer specializing in the production of photovoltaic brackets, with rich experience and an excellent reputation in the photovoltaic field. Our factory is equipped with advanced production equipment and technology. From the selection of raw materials to the manufacturing of finished products, quality is strictly controlled at every step.

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1. Structure and Principle

Helical piers, also known as helical piles, are foundation elements consisting of a central shaft with helical blades or flights attached at regular intervals. The principle behind their operation is similar to that of a screw. When installed, the helical blades are rotated into the ground, much like a screw being turned into a piece of wood. This action allows the helical piers to penetrate the soil, and the helical plates bear the load by transferring it to the surrounding soil layers. The number, size, and spacing of the helical blades are designed based on the soil conditions and the load - bearing requirements of the structure they will support.

2. Installation Process

2.1 Site Inspection

Before installation, a detailed site inspection is carried out. This includes assessing the soil type, its moisture content, and any potential underground obstacles such as rocks, utility lines, or buried debris. The information gathered helps in determining the appropriate length, diameter, and configuration of the helical piers.

2.2 Equipment Setup

A specialized installation rig, often a hydraulic or mechanical drill rig, is used. The rig is positioned at the installation site, and the helical pier is attached to the drill bit. The rig provides the necessary torque to rotate the helical pier into the ground.

2.3 Pier Installation

The helical pier is slowly rotated into the ground. As it advances, the installation crew monitors the torque applied and the depth of penetration. The torque readings can indicate the soil resistance, and ensuring the correct torque - depth relationship is crucial to ensure the pier reaches the required load - bearing strata. Once the desired depth is achieved, the pier is considered properly installed.

3. Application Scenarios in Solar Projects

In solar projects, helical piers are commonly used to support solar panel racking systems. They are especially suitable for sites with challenging soil conditions, such as soft soils, sandy soils, or areas with high water tables. For example, in marshy or coastal areas where traditional concrete foundations may be difficult to construct due to the water - logged soil, helical piers can be easily installed. They can also be used in rooftop solar installations, providing a lightweight and efficient foundation solution without the need for heavy - duty concrete pouring on the roof.

4. Advantages Compared to Concrete Bases

4.1 Installation Speed

Helical piers can be installed much faster than concrete bases. The installation process of helical piers typically involves only a few steps of equipment setup and rotation into the ground, while concrete bases require site preparation, formwork installation, concrete pouring, and curing, which can take weeks.

4.2 Cost - effectiveness

In some cases, helical piers can be more cost - effective. The reduced installation time means lower labor costs. Additionally, since helical piers are pre - fabricated, there is less material waste compared to concrete bases, which may require on - site mixing and pouring.

4.3 Minimized Environmental Impact

Helical piers cause less disruption to the surrounding environment. There is no need for large - scale excavation as in the case of concrete bases, and the installation process generates less noise and dust, making them a more environmentally friendly option, especially in sensitive ecological areas.

4.4 Adaptability to Uneven Terrain

Helical piers can be installed on uneven terrain without the need for extensive grading or leveling. They can be adjusted to different depths at each installation point, allowing for a more flexible and stable foundation solution on sloped or hilly sites.

For more details, pls email:vivian@grengysolar.com

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