夯扩桩是沉管灌注桩与扩底桩结合的产物。由于桩端部具有扩大头,以及夯扩过程中对端部土层的强制挤密效应,能有效改善桩端土层的密实度,增大强度与压缩模量,从而大大提高单桩承载力,具有比沉管灌注桩、预制桩更好的技术经济效益,且施工简便,速度 The ram-expanded pile is the product of the combination of an immersed tube cast-in-place pile and a bulging pile. Due to the enlarged head at the end of the pile and the forced compacting effect of the soil layer at the end during the expansion process, the compactness of the soil layer at the pile tip can be effectively improved, and the strength and compression modulus can be increased, thereby greatly increasing the bearing capacity of the single pile. , It has better technical and economic benefits than the cast-in-place piles and prefabricated piles, and the construction is simple and speedy.