利用温度检测钻孔灌注桩混凝土拌合物面的研究

基于水化放热原理和室内外试验,发现混凝土拌合物层和浮浆层两者有明显的温差,显示可通过温度变化来确定混凝土拌合物灌注高度。据此设计了一种便携式用于判定混凝土拌合物面是否到达设计高度的温控式装置:在设计桩顶高度位置及其下方50 cm处分别埋置一个温度传感器,在设计桩顶高度下方50 cm的温度传感器获得混凝土拌合物的温度峰值,利用设计桩顶高度位置的温度传感器的温度峰值判定混凝土拌合物顶。建议混凝土拌合物超灌在设计桩顶高度位置即第2个温度传感器上方50 cm,比规范要求少超灌0.3 m,能节约混凝土。

Research on concrete mixture surface detection for bored pile based on temperature

Based on the principle of hydration heat release and indoor and outdoor tests, it is found that there is a significant temperature difference between the concrete mixture layer and the floating slurry layer, indicating that the pouring height of the concrete mixture can be determined by the temperature change. A portable temperature control device is designed to determine whether the concrete mixing surface reaches the designed height, that is to say, a temperature sensor is respectively embedded at the height of the designed pile top and at the height of 50cm below, and the temperature sensor of 50cm below the height of the designed pile top is used to obtain the temperature peak of the concrete mixture, and then the temperature peak of the temperature sensor at the height of the designed pile top is used to determine the concrete mixture top. It is suggested that the concrete mixture should be overfilled at the height of the designed pile top, namely 50cm above the second temperature sensor, which is 0.3m less than the norm and can save concrete.