上海地区钻孔灌注桩后注浆设计要点

KEY POINTS OF THE DESIGN OF POST GROUTING FOR CAST-IN-SITE PILE IN SHANGHAI

上海地方地基基础设计规范关于灌注桩后注浆设计条文较少,按照全国基础设计规范进行上海地区灌注桩后注浆设计又存在偏差。根据上海地区灌注桩后注浆的工程实践,结合已有研究成果,总结了上海地区灌注桩后注浆的注浆方式选择、注浆量及单桩承载力确定以及其他注浆注意事项。最后对后注浆灌注桩经济性进行介绍。

Design provisions of the post grouting for cast-in-site pile are less in Shanghai foundation design code,yet there's some deviation by using national foundation design code to design post grouting in Shanghai area. Based on the engineering practice and the existing research results of post grouting for cast-in-site pile in Shanghai area,some key points of the design of post grouting for cast-in-site pile are summarized in Shanghai area,including post grouting mode selection,quantity of grouting and calculation of bearing capacity of single pile etc. Finally,the economy of post grouting for cast-in-site pile is disccused.