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Mini piles, also known as micro piles, are used in underpinning applications to strengthen existing structures such as bridges, retaining walls and floor slabs. Mini piles are generally made from steel and come in various sizes, from 100mm in diameter to 600mm in diameter. They are often used in areas with limited access or headroom, making them ideal for works inside buildings or on sites with restrictive access. [1]
With various applications, these small-diameter piles can be used in conjunction with steel-reinforced ground beams to replace traditional footings when ground conditions become unfavourable.
Mini piles are driven or drilled into the ground by a piling rig and equipment. Instead of a traditional piling rig, mini piling rigs are used. These rigs are smaller in size, providing more flexibility in getting into restricted access sites. The dimensions of mini piling rigs can vary from 720mm to 2500mm wide. Some rigs can be so compact that they can enter through a 3.3ft wide door.
Mini piles can be installed in different methods or techniques. The most suitable method depends on the ground conditions and project requirements. Here are three common methods of mini piling:
Here is a step-by-step guide on how mini piles are generally installed [2]:
The advantages of using mini piling systems include:
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