Helical Anchor Extension
Helical anchor extensions are used to increase the depth of helical anchors in constructions where the foundation needs to be reinforced for stability. The extensions push the anchor to the appropriate depth in the ground to ensure that the anchor is embedded in firm soil.
In constructions done in poor soil conditions, helical anchors are used to reinforce the stability of the foundation. When the anchor on its own cannot reach the most stable soil layer, the anchor extension is used to extend the anchor until the right depth.
Helical anchor extensions typically have a shaft that can be round or square shaped, a forged socket coupler, and a guy attachment point. The extensions are also equipped with a hex bolt for securing the anchor.
Extensions with a square shaft are referred to as square shaft extensions and are intended to be used with square shaft helical anchors. Extensions with a round shaft are referred to as round rod extensions and should only be used with round shape anchors.
The shape of the extension and the anchor need to match for proper alignment which is necessary for a secure and snug connection. If the extension and anchor are different shapes there will be poor transfer of torque and risk of rotation.
Apart from shape, it is also essential to pick an extension that has the same torque capacity as the lead of the anchor rod to which it is being applied. This ensures that the extension and helical anchor are compatible and can both bear the applied loads.
Helical Anchor Extension Drawing
| Series | Length Inch (mm) | Weight Lbs (kg) |
| AE40 | 40(1016) | 28.2 (12.8) |
| AE58 | 58(1473) | 40 (18.1) |
| AE82 | 82 (2083) | 57 (25.9) |
| AE118 | 118 (2997) | 81 (36.7) |
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Frequently Asked Questions (FAQs)
How do helical anchor extensions work?
Helical anchor extensions play a crucial role as part of a helical anchor system installed in the ground to increase the stability of a foundation. The extension adds depth to the helical anchor enabling it to reach the ideal soil layer for firm anchoring. Extending the helical anchor is necessary for foundations in poor soil conditions where more depth is required to achieve stability.
How are helical anchor extensions installed?
Helical anchors extensions are installed by screwing them into the ground. First, the extension is attached to the anchor to be extended. Once connected, hydraulic equipment is used to apply pressure effectively pushing the extension and the anchor deeper into the ground. More extensions can be added until the desired depth is reached.
Are helical anchor extensions available in different configurations?
Yes, helical anchors extensions come with either a square or round shaft. The shaft is designed to match the shape of the helical anchor to which the extension is being added. This ensures a secure connection and efficient torque transfer. Square shaped extensions should only be used for square shape helicals while rod shape extensions are used for round shape helicals.