3 Frequently Asked Questions about Multi-turn Helix

March 22, 2023

Buildings can only last for a long time if they are constructed on top of a solid foundation. 

A foundation is an underground element needed to keep properties stable and solid for multiple years or decades. Its main purpose is to transfer the loads from the building or structure to the ground. It can also, however, be maximised in keeping moisture and groundwater out of the properties. All these functions and purposes can be possible as the foundation is often made from durable materials like concrete blocks, stones, poured concrete, and bricks.

While the materials used for the foundation can last for a long time, they may still require servicing after some time, especially if it is not stable or if the structure’s usage has altered. Underpinning, fortunately, can be done to strengthen the foundation of an existing property.

An Overview of Multi-turn Helix

Screw piles are materials that can be used in carrying out underpinning. They are often comprised of a steel Helix or screw part with a high-strength steel shaft that is welded onto it. The steel Helix carries the pile load in the ground when it is founded at a depth correctly. The free end of the shaft is then connected to the foundation elements of the structure, allowing the building to transfer its loads to the steel Helix.

Multi-turn Helix, however, has been developed to ensure that the underpinning process can be done more accurately and effectively. It features a screw pile shaft that is butt welded into the end of the Helix, providing a more stable assembly for load transfer as opposed to the split plate Helix. The split plate Helix features a Helix that is connected through welding circumferentially around the pile shaft, which can only transfer loads against the welded part. The load transfer in a multi-turn Helix is done directly into its components.

Multi-turn Helix can likewise offer greater load-carrying capacity as opposed to a split plate Helix, especially when compared to their similar diameters.

Multi-turn Helix Common FAQs

Here are some common FAQs you need to know about multi-turn Helix.

1. What are the advantages of a Multi-turn Helix?

Many advantages are associated with multi-turn Helix. First, using multi-turn Helix screw piles can save construction time since they are easy to install. For standard residential houses, these screw piles can already be installed within a day. A four to five-storey apartment block building, alternatively, only needs around 10 days to complete the screw piles installation. Multi-turn Helix screw piles do not likewise produce spoil, eliminating the need for costly waste removal on site. Multi-turn Helix is also environmentally friendly as it only involves minimal vibration and noise.

2. Why should you use multi-turn Helix screw piles over other foundation systems?

Given the advantages of multi-turn Helix screw piles, they are known to be significantly superior to other foundation systems. The cost of installing them is even cheap, making them a good choice for construction work. They can even avoid the foundation from further settling or cracking, which can be present in other foundation systems.

3. How deep should screw piles must be used for underpinning?

The multi-turn Helix screw piles should be around 10 to 20 feet for them to work effectively. The number of screw piles needed for underpinning may range from 1 to 25. Fortunately, footings for these screw piles are not needed anymore.

If you need help with multi-turn Helix, you can contact us at Helcon.

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