振动灌注桩是利用振动沉桩机将桩管沉入土中,然后灌注混凝土而成,它是一种具有发展前途的基础施工工艺。振动灌注桩因其工效高、节约钢材和低廉的工程造价,在国内外已越来越受到人们的重视,在我国南京、天津、武汉、杭州、昆明等城市已较普遍地使用,并积累了不少有益的经验。但从全国范围看,振动沉管灌注桩的优点尚未被人们所认识和重视,也未能普遍推广。现以振动沉管灌注桩与钢筋混凝土预制桩相比较,分析其主要优点如下:适应地质条件的变化。建筑场地的工程地质条件往往存在着局部的变化,勘察资料不可能将它全部反映出来。例如,两个钻孔相距20m,根据它们所联的地层,其厚薄与层面标高都与实际有较大出入,按勘察资料所选定的预制桩长度,往往会因为地层的局部变化,有时打不下去,要砍桩,有时又 The vibratory cast-in-place pile is made by sinking the pile tube into the soil by a vibratory pile driver and then pouring the concrete. It is a basic construction process with a promising future. Vibrating cast-in-place piles have attracted more and more attention at home and abroad due to their high work efficiency, economical steel, and low construction cost. They have been used more commonly in cities like Nanjing, Tianjin, Wuhan, Hangzhou and Kunming, and have accumulated. A lot of useful experience. However, from a nationwide perspective, the advantages of vibratory immersed cast-in-place piles have not been recognized and valued by people, and they have not been universally promoted. The main advantages of vibratory tube cast-in-place piles and reinforced concrete precast piles are analyzed as follows: Adaptation to changes in geological conditions. There are often local changes in the engineering geological conditions of the construction site, and it is impossible for the survey data to fully reflect it. For example, if the two boreholes are separated by 20m, the thickness and the elevation of the two layers will vary greatly depending on the strata they are connected to. The length of the prefabricated pile selected according to the survey data will often be affected by local changes in the strata. If you don’t go down, you have to cut the pile and sometimes