预成孔法检测装配式结构套筒灌浆饱满度的试验研究

Experimental study on the preformed aisle method for inspecting the grouting fullness of sleeve of prefabricated structures

灌浆饱满度是影响钢筋套筒灌浆连接性能的重要因素,基于灌浆不饱满的范围通常位于套筒出浆孔及其以下部位的特征,设计了一种预成孔装置,在灌浆施工完毕后将该装置代替橡胶塞放入出浆孔进行封堵,待灌浆料凝固后取出成孔棒即可形成检测孔道。研究结果表明:漏浆造成灌浆不饱满的施工缺陷均位于套筒顶部,在出浆孔进行灌浆饱满度检查是有效的;热缩预成孔法切实可行,成本低廉,可重复使用且不增加施工工序;利用检测孔道,便于采用内窥镜进行定性检查和定量检测,并可根据内窥镜三维成像数字扫描结果精确计算灌浆不饱满范围,检测结果直观且精度高。

The grouting fullness is an important factor affecting the grouting connection performance between sleeve and rebar. Based on the fact that the insufficient grouting generally occurs at outlet port of sleeve and its lower part, a preformed-aisle device was designed. The device was placed at the outlet port instead of the rubber plug to seal off after grouting construction was completed. When the grout has been curdled, the inspect aisles were formed by taking out the preformed-aisle bar. The research results show that: the construction defects of insufficient grouting caused by grout leakage are located at the top of the sleeve, and it is effective to check the grouting fullness at the outlet port of sleeve; the heat shrinkage preformed aisle method is feasible, cheap, reusable, and avoid increasing the construction process; it is convenient to use the endoscope for qualitative inspection and quantitative detection by the detection aisle, and according to the digital scanning results of the three-dimensional imaging endoscope, the range of insufficient grouting can be accurately calculated, which are direct and accurate.