装配式套筒灌浆质量检测与管理策略研究

Case Study on Post-construction Detection of Grouting Fullness of Prefabricated Building Sleeves

套筒连接类装配式建筑现场安装的重点是保证灌浆密实度,研究对灌浆套筒饱满度进行快速工后检测的可行性,并提出对应的管理对策。本文项目采用超声波相控阵、钻孔内窥镜成功应用于套筒灌浆饱满度检测。应用表明,钻孔内窥镜通过出浆口钻进能够快速实施检测,检测效果直观;超声波相控阵因出浆口附近反射界面多,缺陷误判率较高。检测结果显示,大部分灌浆欠饱满套筒能够达到钢筋锚固长度要求,套筒灌浆质量缺陷率在5%以内。为保障套筒节点的质量,需进行灌浆工艺验证,通过出浆口钻孔内窥镜检查可以快速识别浆液回落情况。对于发现灌浆问题的预制构件,需要对同班次、轴线上的节点进行大比例普查,以防质量缺陷成片出现导致严重安全隐患。

The focus of on-site installation of sleeve-connected prefabricated buildings is to ensure the density of grouting,study the feasibility of rapid post-construction inspection of the fullness of grouting sleeves,and propose corresponding management strategies.This article uses ultrasonic phased array and drilling endoscope to successfully detect the grouting fullness of the sleeve.Applications show that drilling endoscopes through the slurry outlet can quickly perform inspections,and the detection results are intuitive;the ultrasonic phased array has a high false positive rate for defects due to the large number of reflective interfaces near the slurry outlet.The test results show that most of the under-grouted sleeves can meet the requirements for the anchorage length of steel bars,and the sleeve grouting quality defect rate is within 5%.In order to ensure the quality of the sleeve joints,need to verify the grouting process,Drilling endoscope inspection through the grout outlet can quickly identify the slurry fallback.Condition.For prefabricated components where grouting problems are found,a large-scale survey of nodes on the same shift and axis is required to prevent quality defects from appearing in pieces and causing serious safety hazards.