钢筋浆锚搭接连接灌浆密实度检测方法试验研究

Experimental Research on Test Method for Grouting Compactness of the Rebar Lapping in Grout-filled Hole

采用预埋传感器阻尼振动法对钢筋浆锚搭接灌浆过程中的施工质量进行了检测,采用冲击回波法和X射线法分别对波纹管约束和螺旋箍筋约束的钢筋浆锚搭接试件的灌浆密实度进行了检测。结果表明:预埋传感器阻尼振动法对灌浆施工过程的灌浆密实度的判断较为可靠;冲击回波法可以定性地发现灌浆不密实的情况,但对灌浆段和非灌浆段的界面判断不够准确;X射线法可以较清楚地判定单排孔道内部灌浆段和非灌浆段的界面,并建议了适当的检测参数,但其有效检测时的试件厚度有明显限制。现场检测时,可以综合应用预埋传感器阻尼振动法和X射线法,分别进行灌浆密实度的过程控制和事后检验,以有效提升灌浆质量。

The grouting compactness of the rebar lapping in grout-filled hole during the grouting process were tested by damping vibration method with embedded sensors. The grouting compactness of the rebar connection with corrugated pipe constraints and spiral stirrups constraints were tested by impact-echo method and X-ray method respectively. The experimental results show that the damping vibration method with embedded sensors was reliable in the judgment of grouting compactness during the grouting process. The impact-echo method was able to give a qualitative judgment for grouting compactness, but the interface between grouting and non-grouting could not be reflected accurately. The X-ray method could clearly detect the interface between grouting and non-grouting for the single row connection and the appropriate testing parameters for X-ray method were suggested. The thickness of specimen strongly affected the test results, and it should be restricted in the X-ray test. In order to effectively improve the quality of grouting, it is recommended that the integrated application of the damping vibration method with embedded sensors for grouting process control and the X-ray method for back testing.