多种检测及验证方法判定灌注桩桩身完整性

Determination of Integrity of Cast-in-place Piles by Various Detection and Verification Methods

目前检测桩身完整性常用的方法各自具有一定优势,同时也存在一定盲区。其中灌注桩受施工方法和地质条件等多方面影响,成孔往往出现截面比预制类桩变化大,采用低应变反射波法检测时,该变化会直接影响采集的数据导致误判。通过对几个工程实例的分析,针对不同的工程情况,说明采用多种检测及验证方法判定灌注桩桩身完整性的必要。低应变反射波法具有仪器设备相较其他检测方法小巧轻便、操作简便快速的特点,适合大范围、多数量快速检测工作的需要;但检测人员需仔细研究数据并及时分析原因,采取多种检测手段及验证方法来判别被测桩的完整性。

At present, the commonly used methods for detecting the pile integrity have certain advantages respectively, and have certain blind spots. In which, the cast-in-place pile is affected by many aspects of construction method, geological conditions and etc. Its section often tends to have larger changes than the precast piles. When the low-strain reflection wave method is used, this change will directly affect the collected data and lead to misjudgment. According to the analysis of several engineering examples and aiming at the different engineering situations, it is necessary to use various detection and verification method for determining the integrity of cast-in-place pile. Compared with the other detection methods, the low-strain reflection wave method has the characteristics of small, light, easy and fast operation, and is suitable for the large range and large quantity of fast detection needs. Therefore, the detection persons are required to study the data in detail and analyze the causes in time. Various detection and verification methods are used to distinguish the integrity of the detected pile.