桩端后压浆在苏通大桥基础工程中的应用与研究
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摘要
桩端后压浆技术目前在我国已得到了广泛应用,但多用于城市高层建筑的桩基中,在桥梁特别是在大型桥梁工程中的应用还缺乏成熟的经验。通过苏通大桥19根试桩和主桥、辅桥494根大直径深长桩首次运用U管压浆的成功实践,揭示了压浆的作用机理,提出了实用的理论计算公式,研究了U管压浆装置和成套的施工工艺及质量控制标准,并采用C T检测和承载力自平衡对比试验等手段,有力地验证了压浆取得的效果,值得在类似工程中借鉴和参考。
Pile tip grouting technique has been widely adopted in China,especially in pile foundation of high building.As for bridge construction esp.large-scale bridge construction,there is little experience in its application.This article explains the operation mechanism of grouting based on the successful practice of U-pipe grouting adopted in Sutong Bridge project,i.e.19 trial piles and 494 large-diameter long piles both for main bridge and auxiliary bridge.This article also introduces practical calculation formula and presents the research results of U-pipe grouting device and a whole set of construction workmanship and quality control standards.Finally it effectively identifies the good results of grouting with means of CT inspection and bearing capacity comparison.
Pile tip grouting technique has been widely adopted in China,especially in pile foundation of high building.As for bridge construction esp.large-scale bridge construction,there is little experience in its application.This article explains the operation mechanism of grouting based on the successful practice of U-pipe grouting adopted in Sutong Bridge project,i.e.19 trial piles and 494 large-diameter long piles both for main bridge and auxiliary bridge.This article also introduces practical calculation formula and presents the research results of U-pipe grouting device and a whole set of construction workmanship and quality control standards.Finally it effectively identifies the good results of grouting with means of CT inspection and bearing capacity comparison.
引文
[1]东南大学.苏通大桥桩底压浆技术与工艺研究[R].2004.
[2]江苏省苏通大桥建设指挥部.苏通大桥桩端后压浆工法[S].2004.
[3]东南大学.苏通大桥试桩研究总报告[R].2004.
[4]江苏省地震工程研究院.苏通大桥桩端压浆效果CT检测报告[R].2004.
[5]廖小青,谢仲屏.钻孔灌注桩后压浆工程实例及机理分析[J].华东建工勘察,2002(4).
[6]沈保汉.后注浆桩技术[J].工业建筑,2001,31.
[7]李小青.竖向荷载下后压浆桩承载性状的数值分析[J].探矿工程,2000(6).
[8]杨顺,高庆新.桩端后压浆技术及在工程中的应用[J].工程质量,2002(2).
[2]江苏省苏通大桥建设指挥部.苏通大桥桩端后压浆工法[S].2004.
[3]东南大学.苏通大桥试桩研究总报告[R].2004.
[4]江苏省地震工程研究院.苏通大桥桩端压浆效果CT检测报告[R].2004.
[5]廖小青,谢仲屏.钻孔灌注桩后压浆工程实例及机理分析[J].华东建工勘察,2002(4).
[6]沈保汉.后注浆桩技术[J].工业建筑,2001,31.
[7]李小青.竖向荷载下后压浆桩承载性状的数值分析[J].探矿工程,2000(6).
[8]杨顺,高庆新.桩端后压浆技术及在工程中的应用[J].工程质量,2002(2).
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