Driven piles are piles that are hammered or pushed into the ground by a pile driver or a hydraulic press. Precast concrete piles are one of the most common types of driven piles, typically made of reinforced or prestressed concrete. These piles are manufactured off-site and transported to the site, where they are driven to the desired depth and connected to the pile cap. Precast concrete piles have several advantages, such as high load-bearing capacity, low maintenance, uniform quality and dimensions, fast installation, and minimal site disturbance. However, they also have some disadvantages, like limited flexibility, high transportation and handling costs, high noise and vibration levels, and potential cracking or damage during driving.
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Bored piles are piles that are drilled or augered into the ground by a rotary rig or a continuous flight auger. They can be made of concrete, steel, or a combination of both and are usually cast in situ, meaning that concrete is poured into the borehole after drilling and reinforced with steel bars or cages. These piles offer high flexibility and adaptability, as they can be varied in length, diameter, and shape according to the site conditions and design requirements. Additionally, they have low noise and vibration levels, making them suitable for urban or sensitive areas, as well as high lateral load resistance due to their enlarged bases or belled ends. Furthermore, bored piles have better performance in soft or loose soils since they can penetrate deeper and avoid soil disturbance or heave. However, there are some disadvantages to using bored piles such as low load-bearing capacity and resistance to uplift due to their dependence on the quality and strength of the surrounding soil and the concrete curing process. Additionally, they have high maintenance and susceptibility to deterioration due to their exposure to groundwater, chemicals, or aggressive soils. Furthermore, they have variable quality and dimensions due to drilling accuracy, soil conditions, and concrete placement. Lastly, these piles have slow installation and high site disturbance as they require excavation, spoil removal, and casing or bentonite support.
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