目前，桩基施工单位在钻孔桩浇灌时，测定砼上升面一般使用测绳（或皮尺），下端吊重锤。终灌时，也多采用此法测定桩顶砼面，进行桩头砼超高量的控制。由于桩顶处混杂有浮浆渣层和泥浆的混合物，采用测绳测定终灌时的粗骨料界面，手感模糊，难以判断准确；泥浆浓、浮浆层... At present, when the pile foundation construction unit is irrigating the bored pile, it is generally measured with a measuring rope (or tape measure) and a lower weighted hammer when measuring the rising surface of the borehole. At the time of final irrigation, this method is also used to determine the top surface of piles and super high volume control of pile heads. Because the pile top is mixed with a mixture of laitance slag layer and mud, the rough aggregate interface at the time of final irrigation is determined by measuring the rope, and the hand feel is vague, and it is difficult to judge accurately; the mud thick, the lai...