PHP泥浆在桥梁超长超大直径钻孔灌注桩施工中的应用  

APPLICATION OF PHP SLURRY TO DRILLING OF OVERLENGTH AND EXTRA-LARGE-DIAMETER BORED PILES

作　　者：张雄文[1] 管义军[2] 周建华[2] 

机构地区：[1]河海大学土木工程学院,江苏南京210098 [2]江苏省苏通大桥建设指挥部,江苏南通226009

出　　处：《岩石力学与工程学报》2005年第14期2571-2575,共5页Chinese Journal of Rock Mechanics and Engineering

摘　　要：PHP(partiallyhydrolyzedpolyacrylamide)泥浆是一个特别适合于超长超大直径钻孔灌注桩施工的泥浆系统。制作原料、制作过程、循环系统及施工控制等是决定其经济性、高效性的关键因素。苏通大桥工艺试桩工程根据工程场区独特的地质、水文条件确定了适合该工程的PHP泥浆循环系统,以实践证明采用该系统可以实现桩侧泥皮厚度小于1mm、桩底沉渣厚度为0cm。PHP (partially hydrolyzed polyacrylamide) slurry is especially suitable for the drilling of overlength and extra-large-diameter bored piles. Its economical efficiency and construction efficiency are dependent on the following key factors: manufacturing of raw materials, manufacturing process, cycling system and construction control. According to geological and hydrologic conditions of the site of Su-Tong Bridge, the testing pile project has adopted PHP slurry cycling system, which has been proved in the practice to have achieved thickness of mud cake around piles less than 1 mm and thickness of sediments at pile tip of zero.

关 键 词：桥梁工程 PHP泥浆 苏通大桥 钻孔灌注桩 泥皮 桩底沉渣 

分 类 号：TU473.14[建筑科学—结构工程] U443.154[建筑科学—土工工程]