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灌注桩具有能灵活控制桩长、技术经济指标较好等优点,因而在建筑工程中得以广泛应用。但因无论哪种类型的灌注桩,其施工过程均为就地成孔(钻孔、冲孔、凿孔、沉管、爆扩成孔等)、原孔浇灌(常规浇灌或水下浇灌),故施工质量的控制标准,往往不像预制桩以贯入度或标高控制那样明确,所以灌注桩(尤其是小直径灌注桩)更容易出现施工质量问题。我国沿海地区有质量问题的灌注桩桩数占总桩数的10%左右。据对广东省近几年来桩基工程的宏观调查得知,出问题最多的是沉管灌注桩,有5～10%的桩承载能力不
Cast-in-place piles have the advantages of flexible control of pile length, better technical and economic indicators, and are widely used in construction projects. However, regardless of the type of cast-in-situ pile, the construction process is in-situ hole formation (drilling, punching, boring, sinking, explosion expansion, etc.), and original hole irrigation (conventional or underwater irrigation). Therefore, the control standards for construction quality are often not as clear as the penetration or elevation control of prefabricated piles. Therefore, the construction quality problems are more likely to occur in cast-in-place piles (especially for small-diameter cast-in-place piles). The quality of piles in China’s coastal areas accounted for about 10% of the total number of piles. According to the macro survey of the pile foundation projects in Guangdong Province in recent years, it is found that the most problematic problems are immersed tube cast-in-place piles with 5-10% pile bearing capacity.