（1 山西大学电力与建筑学院， 太原 030013； 2 西安建筑科技大学材料科学与工程学院， 西安 710055）

［摘要］接点连接性能的优劣直接影响到装配式建筑的整体质量。通过对9组灌浆套筒渐进式缩径、1组0缩径、5组不同限制膨胀率的灌浆料，进行钢筋锚固长度为4d和5d的套筒灌浆连接系统极限荷载拉拨试验研究，考察了不同缩径尺寸和不同端头缩径长度下限制膨胀率对套筒灌浆连接系统极限荷载的影响。试验结果表明，端头缩径长度和缩小直径相同时，随着限制膨胀率增大，套筒灌浆连接系统的极限荷载均呈现出先增大后减小的趋势；端头缩径长度不同和缩小直径相同时，随着端头缩径长度的增加，不同限制膨胀率对应的套筒灌浆连接系统极限荷载均呈现出逐步增大的趋势；在满足灌浆套筒体系标准要求和不影响施工的前提下，缩小直径的尺寸应不小于3mm，端头缩径长度应不小于50mm，灌浆料的7d限制膨胀率应不大于0.048%，同时28d限制膨胀率要求降低得越小越好。

［关键词］装配式建筑；套筒灌浆连接系统；端头缩径；约束膨胀；限制膨胀率

中图分类号：TU375，TU502+.6文献标识码：A文章编号：1002-848X(2021)09-0043-06

Research on the key technology of restrained expansion of the sleeve grouting connection system in prefabricated building

LI Xianjun1, DENG Meilin1, HE Tingshu2

(1 School of Electric Power, Civil Engineering and Architecture, Shanxi University, Taiyuan 030013, China; 2 College of Materials Science and Engineering, Xi′an University of Architecture and Technology, Xi′an 710055, China)

Abstract:The good or bad performance of the joint connection directly affects the overall quality of prefabricated building. By using 9 groups of grouting sleeves with progressive reducing diameter, 1 group of 0 reducing diameter and 5 groups of grouting with different restrained expansion rates, the ultimate load tensile tests of the sleeve grouting connection system with anchoring lengths of 4d and 5d were carried out. The influence of the restrained expansion rate on the ultimate load of the connection system under different necking sizes and under different end necking lengths were investigated. The test results show that the ultimate load of the sleeve grouting connection system increases first and then decreases with the increase of the restrained expansion rate, when the end necking length and necking diameter are the same. The ultimate load of the sleeve grouting connection system corresponding to different restrained expansion rates of grouting materials increases gradually with the increase of end necking length, when the end necking length is different and the necking diameter is the same. On the premise of meeting the standard requirements of grouting sleeve system and without affecting the construction, the size of necking diameter should not be less than 3mm, the end necking length should not be less than 50mm, the 7d restrained expansion rate of the grouting material should be less than 0.048%, and the 28d restrained expansion rate should be  reduced as small as possible.

Keywords:prefabricated building; sleeve grouting connection system; end necking diameter; restrained expansion; restrained expansion rate

*国家自然科学基金资助项目（11802166），山西省面上自然基金资助项目（201901D111036），山西省重点研发计划资助项目（201903D121099）。

作者简介：李宪军，硕士，副教授，高级工程师，硕士生导师，Email：lixianjun142232@sxu.edu.cn。