At present, the common pile foundation detection methods at home and abroad are as follows:
① Core drilling method: because the planned load of large straight bored pile is generally large, there are many difficulties in using static pile test method. Therefore, geological drilling rig is commonly used to drill core samples along the length direction of the pile body, and the quality of the pile is determined through the investigation and test of the core sample. However, this method can only reflect the quality of a small part of the concrete within the scope of drilling, and the equipment is huge, time-consuming and expensive. It is not suitable to be used as a large-area testing method, but can only be used for sampling inspection. Generally, 3-5% of the total pile quantity is sampled or used as a checking method for the results of non-destructive testing.
② Vibration detection method: also known as dynamic measurement method. It is to apply an exciting force on the top of the pile to make the pile and the pile-soil system vibrate. It is a method to estimate the concrete quality and overall bearing capacity of the pile by analyzing the shaking and shaking parameters. There are four kinds of methods, namely percussion method and hammering method, steady-state excitation mechanical impedance method, transient excitation mechanical impedance method and hydropower effect method.
③ Ultrasonic pulse inspection method: this method is developed on the basis of detecting the defects of concrete. The method is to embed a number of detection pipes parallel to the length direction of the pile before the concrete pouring of the pile, which is used as the channel for ultrasonic testing and receiving transducer. During the detection, the probe moves synchronously in two pipes, and measures the parameters of ultrasonic pulse passing through concrete point by point along different depths, and analyzes the concrete quality on each section according to the principle of ultrasonic flaw detection.
④ X-ray method: this method is based on the attenuation, absorption and scattering of radioisotope radiation in concrete. When the ray passes through the concrete, the intensity of the ray recorded by the acceptor changes due to the different quality of the concrete or the defects, so as to judge the quality of the pile. A method of foundation. When the ray passes through the concrete, the intensity of the ray recorded by the acceptor changes due to the different quality of the concrete or the defects, so as to judge the quality of the pile.
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