钻孔灌注桩因其单桩承载力高、抗震性能好等优点，广泛应用于建筑、桥梁、输电线路铁塔基础中。但由于受多种因素的影响容易出现缩颈，因此在施工中必须根据不同施工条件采取适当的施工工艺、不同长度的护筒及埋设方法、保证泥浆质量等措施，保证工程质量。 Bored cast-in-place piles are widely used in the foundation of buildings, bridges, and transmission line iron towers because of their advantages such as high bearing capacity and good seismic performance. However, due to a variety of factors that are susceptible to necking, it is necessary to adopt appropriate construction techniques, different lengths of casings and burial methods, and guarantee the quality of the mud in order to ensure project quality in accordance with different construction conditions.