求翻译：通过湖南地区一栋20层高层建筑采用后注浆长螺旋钻孔灌注桩基础的工程实例，并与相邻高层建筑非后注浆长螺旋钻孔灌注桩基础的比较研究，认为在湖南地区相似的工程地质场地内采用后注浆长螺旋钻孔灌注桩基础，单桩承载力提高60%~120%，能大大降低工程造价，是一种比较安全经济的桩基础形式。是什么意思？

By Hunan high-rise building using a 20-story long after grouting of bored pile foundation engineering examples and non-adjacent high-rise building after a long bored pile foundation grouting comparative study, similar to that in Hunan engineering geological venue after grouting using a long bored pi

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Uses the note thick liquid long spiral drill hole irrigation pile foundation project example after a Hunan area 20 building store height level building, and after the neighboring high-rise construction non-note thick liquid long spiral drill hole irrigation pile foundation comparison research, thoug

Through Hunan area a building 20 layer senior building used Hou note pulp long spiral drilling perfusion pile foundation of engineering instance, and and adjacent senior building non-Hou note pulp long spiral drilling perfusion pile foundation of comparison research, think in Hunan area similar of e

Through the long and spiral project example which pours into a foundation of holing of thick liquid of the note after being adopted of a 20 - storeyed skyscraper of Hunan area, until note thick liquid long to hole to pour into a comparative study on foundation while being spiral after adjacent skysc