低标高桩顶水下钻孔灌注桩混凝土超灌高度控制装置研制

Development of Control Device of Concreting in Excess for Bored Pile Underwater with Low Elevation Pile Head

在低标高桩顶水下钻孔灌注桩施工中,用测绳人工测定混凝土超灌高度误差大,易造成桩顶混凝土欠灌或超灌高度过大等问题。根据钻孔灌注桩泥浆重度与混凝土重度不同而在一定深度下产生压力差的原理,研制了一种钻孔灌注桩混凝土超灌高度控制装置,并进行了现场试验。试验结果表明,该装置精度高,简便实用,具有较高的推广价值。

In construction of bored pile underwater with low elevation pile head,the height of concreting in excess measured with a rope has large error and easy cause under concreting or concreting in excess too much. According to the principle of pressure difference between mud and concrete,in certain depth,which was caused by the difference between bored pile mud unit weight and concrete unit weight,a control device of concreting in excess for bored pile has been developed and tested on the spot. The test results show that the device has the advantages of high precision,simple and practical,and high popularizing value.