Know the Mechanics of Multi-Turn Helix in Screw Piling Applications
August 25, 2023Discover the effectiveness of multi-turn helix in providing stability and load-bearing capacity to structure. Learn how it is maximised in screw piling.
Screw piling is a deep foundation technique used to support structures by transferring loads to the soil. It involves installing helical-shaped piles into the ground, which provide stability, load-bearing capacity, and resistance against vertical and horizontal forces. This technique is commonly used in residential, commercial, and industrial construction projects.
Primary Steps in Screw Piling
Many steps are involved in screw piling.
The first step is site investigation. It involves a thorough site assessment to check the condition of the soil. Some elements of the soil that are being assessed are composition, strength, and stability. These things help in determining the right design and configuration of the screw piles.
After checking the site investigation results and determining the structural requirements of the project, the involved engineers and contractors should design the screw piles so they can withstand the anticipated loads. Their design must consider the soil type, bearing capacity, and the expected settlement of the project.
The screw piles must then be installed using hydraulic-powered machines or excavators with torque heads. Once they are installed, they can now effectively transfer the load from the structure to the soil. Proper length and configuration of the screw piles can help guarantee adequate load-bearing capacity and structural support.
Mechanics of Multi-Turn Helix
As mentioned earlier, a multi-turn helix is a key component of screw piling. Knowing the mechanics of multi-turn helix can help ensure efficient and reliable screw piling applications.
The multi-turn helix is a helical-shaped plate or blade attached to the lower end of a screw pile. It is often made of steel, allowing it to transfer the load from the structure to the soil effectively. The helix acts as a bearing surface, providing resistance against vertical and horizontal loads.
The design of this key component is vital to ensure optimal performance. It is typically composed of two or more helical plates or blades that wrap around the central shaft of the screw pile. The number and size of the helical plates depend on various factors like soil conditions, load requirements, and project specifications.
This key component is installed into the ground using hydraulic-powered machines or excavators with torque heads. As the helix is rotated into the soil, it generates a self-drilling effect, cutting through the ground and displacing soil radially. The helix then anchors itself in the soil to effectively provide stability to the screw pile.
The multi-turn helix then works on the principle of friction and bearing capacity. As the helix penetrates the soil, it produces a reaction force between the helix and the surrounding soil. This reaction force subsequently generates friction, transferring the load from the structure to the soil. Additionally, the helix also relies on the bearing capacity of the soil to support the load.
Advantages and Applications
The multi-turn helix provides numerous advantages in screw piling. It can provide high load-bearing capacity, which allows for the support of heavy structures. It is also versatile as it can be installed in various soil conditions like cohesive soils, granular soils, and weak or soft soils. The installation process is likewise relatively quick and efficient, resulting in time and cost savings. Screw piles with multi-turn helices are also easily removable and reusable.
All these advantages of screw piling make it effective in various construction projects, including residential, commercial, and industrial applications. It can work for foundation systems, retaining walls, boardwalks, bridges, and other structures that need stable and reliable support.
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