中钢天津响螺湾工程后压浆钻孔灌注桩施工技术

Construction Technology of Post-grouting Bored Pile for Xiangluowan Project of Sinosteel in Tianjin

摘要:

中钢天津响螺湾工程基础桩采用后压浆钻孔灌注桩，最大桩长达76 m，设计单桩承载力特征值达15000 kN。阐述该工程钻孔桩的施工工艺、施工中出现的问题和解决方法、孔口钢筋笼直螺纹对接技术、后压浆施工工艺。通过现场试验，全部桩为Ⅰ类桩，单桩承载力达到设计要求，极限承载力实测值最大为35000 kN，为工程桩的设计提供了可靠的技术参数。

Abstract:

The post-grouting bored pile was used for the foundation pile for Xiangluowan project of Sinosteel in Tianjin, the maximum length of the pile was 76m and the designed eigenvalue of bearing capacity of single pile was up to 15000kN. The paper elaborates the bored pile about its construction technology, technical difficulties and the solutions, straight thread connection technology for reinforcement cage at pile hole entrance and post grouting construction technology. The field tests prove that all the piles are of the class Ⅰ, the bearing capacity of single pile meets the design requirements and the maximum value of ultimate bearing capacity is 35000kN.