What is the specific number of ultrasonic test of hole pile?

1. The number of caps with three piles or less under the column shall not be less than one pile;

2. For cast-in-place piles with grade A design or complex geological conditions and low quality and reliability of piles, the number of spot checks shall not be less than 30% of the total number of piles and shall not be less than 20; The number of random checks for other pile foundation works shall not be less than 20% of the total pile number, and shall not be less than 10.

Note: FOR END-BEARING LARGE-DIAMETER CAST-IN-PLACE PILES, THE DRILLING CORE METHOD OR ACOUSTIC TRANSMISSION METHOD SHOULD BE USED TO TEST THE INTEGRITY OF PART OF THE TESTED PILES WITHIN THE RANGE OF THE NUMBER OF SAMPLING PILES STIPULATED IN THE ABOVE TWO PARAGRAPHS. The number of spot checks shall not be less than 10% of the total pile number. There is to see the requirements of the design institute.

Each of the bridge piles will be examined by acoustic waves.

Ultrasonic foundation pile borehole detection, Concrete bored piles into holes: the basic principle of ultrasonic testing instrument winch in into hole, make the ultrasonic wave transmitting and receiving probe aimed at the center of the hole, in the process of probe along the borehole centerline down, pulse signal generator in a series of electrical impulses to launch on the piezoelectric transducer, piezoelectric body converts the signals into the ultrasonic pulse and launch, ultrasonic pulse After passing through mud and drilling side wall, the part is reflected back and received by the receiver, and then converted into electrical signal and transmitted to the operator. According to the reflection signal strength and reflection time difference, the operator prints the hole wall curve on the printer paper in real time. According to the image can be drilled into the hole quality intuitive judgment.

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