浅谈声波透射法和钻芯法在大直径混凝土灌注桩检测中的应用

Discussion on the Application of Acoustic Transmission and Core Drilling Methods to the Inspection of Large Diameter Concrete Cast-in-place Piles

大直径混凝土灌注桩的施工质量直接影响工程质量,因此,要对灌注桩施工质量进行检测。传统检测方法有声波透射法和钻芯法两种,声波透射法检测速度快,但不能检测桩底沉渣及桩端持力层情况;钻芯法检测速度比较慢,且只能反映局部桩身混凝土质量。本文结合工程实例,阐述和分析了声波透射法和钻芯法两种检测方法的基本原理和优缺点,提出运用预埋管钻芯法结合声波透射法检测灌注桩质量,该方法能避免前述两种方法的缺点,并且能够更准确、全面、系统地评价大直径混凝土灌注桩的施工质量,提高检测速度和经济效益。

The construction quality of the large diameter concrete cast-in-place piles makes direct differences on the quality of the whole project. Therefore, it is necessary to inspect their construction quality, where acoustic trans-mission and core drilling are the mainly traditional methods. The acoustic transmission method has a relative short operation period, but it is powerless to reveal the sediment and bearing layer conditions at the tested pile toe. On the other hand, core drilling method is slow to be carried out and can only reflect the quality of local pile concrete.Combining with the engineering examples, the basic principles, advantages and disadvantages of the mentioned two methods, i.e., acoustic transmission and core drilling methods, are introduced in this paper. The employment of em-bedded pipe core drilling method combined with the acoustic transmission method can avoid the disadvantages of two traditional detection methods. Besides, the proposed method can provide more accurate, comprehensive and systematical evaluation results of the construction quality of large-diameter concrete cast-in-place piles, and im-prove the detection speed and economic benefits.