后注浆技术在福建某食品检测大楼的应用

The application of post grouting technique in a food inspection building in Fujian province

灌注桩后注浆是灌注桩的铺助工法,该技术在普通灌注桩成桩的基础上,通过后注浆施工工艺,使桩端、桩侧的土体(包括沉渣和泥皮)得到加固,形成一个较为密实的载体。结合某工程实例分析表明,在桩的长径比一定的前提下,灌注桩后注浆技术可有效提高单桩承载力,增强桩的质量稳定性,减少桩基沉降。

The post grouting of cast-in-place pile is the assistant method of cast-in-place pile. After the construction of common bored piles,through post grouting,the soil（ including sediment and mud skin） at the end of the pile and the side of the pile would be strengthened to form a relatively dense carrier. An engineering example shows that at the certain precondition of the pile diameter ratio,post grouting technology can effectively improve the bearing capacity of single pile,the stability of the pile can be improved and the settlement of pile foundation can be reduced.