后注漿灌注樁在湖南地區(qū)的應(yīng)用實(shí)例
王石高1， 李祖民2， 易廣智1
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王石高1， 李祖民2， 易廣智1(1湖南省建筑設(shè)計(jì)院，長沙410011; 2常德市第一人民醫(yī)院基建辦，常德415000)[摘要] 通過湖南地區(qū)一棟20層高層建筑采用后注漿長螺旋鉆孔灌注樁基礎(chǔ)的工程實(shí)例，并與相鄰高層建筑非后注漿長螺旋鉆孔灌注樁基礎(chǔ)的比較分析，認(rèn)為在湖南地區(qū)相似的工程地質(zhì)場地內(nèi)采用后注漿長螺旋鉆孔灌注樁基礎(chǔ)，單樁承載力提高60% ~120%，能大大降低工程造價(jià)，是一種比較安全經(jīng)濟(jì)的樁基礎(chǔ)形式。文中還介紹了后注漿長螺旋鉆孔灌注樁設(shè)計(jì)和施工方法。[關(guān)鍵詞] 長螺旋鉆孔灌注樁；后注漿；單樁承載力；注漿量；注漿壓力中圖分類號：TU473 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2012) S2-0492-06Application example of post grouting spiral bored piles in HunanWang Shigao1, Li zumin2, Yi Guangzhi1(1Hunan Provincial Architectural Design Institute, Changsha 410011, China; 2 Civil Construction Office of the First People's Hospital of Changde, Changde 415000, China)Abstract: Through the research of an engineering instance of 20-story tall building with posterior grouting long spiral bored pile foundation in Hunan, and compared it with an adjacent tall building with long spiral bored pile foundation, we think that the bearing of a single posterior grouting long spiral bored pile will improve 60 percents to 120 percents in sinular engineering geology site in Hunan. The posterior grouting bored pile foundation can greatly reduce the engineering cost, basically it is a safe and economical pile foundation form. The thesis then introduced the design and construction methods of posterior grouting long spiral bored pile.Keywords: long spiral bored piles; post-grouting; bearing capacity of a single pile; grout amount; grouting pressure
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