Why we need a set of ultrasonic drilling monitor in pile foundation construction?

What is ultrasonic drilling monitor?

A ultrasonic drilling monitor, refers to a set of tools, instruments, and technologies used to measure and analyze various parameters during the pile foundation construction. The goal is to guide the optimization of construction process equipment and methods to save costs, to guide the correction of unqualified holes and grooves, and to improve the success rate and efficiency of piles and walls.

It can detect four parameters: hole depth/trough depth, hole diameter/trough width, pile hole/trough wall verticality, and sediment thickness of bored piles and underground diaphragm walls.

What parts does a ultrasonic drilling monitor consist of?

Based on our TS-K100DC(B), there are totally 4 parts:

  1. Synchronous printing host control box
  2. Multifunctional cable winch
  3. Probe lifting CNC winch
  4. Multifunctional integrated probe

How does the ultrasonic drilling monitor work?

The ultrasonic probe descends from the orifice at a constant speed under the control of the lifting device. The depth measuring device measures the depth of the probe and transmits it to the host. The host controls the ultrasonic transmitting probe to emit ultrasonic waves according to the set time interval and starts the timing synchronously. The host sets the The sampling delay and sampling rate start the high-speed and high-precision signal collector to collect ultrasonic signals.

Since the acoustic impedance of the mud is much smaller than the acoustic impedance of the soil (or rock) medium, the ultrasonic wave is almost completely reflected from the hole wall. The reflected wave is received by the receiving transducer after propagating through the mud. The time when the reflected wave arrives is the time when the ultrasonic wave reaches the hole. The propagation time in the inner mud is used to calculate the distance between the ultrasonic transducer and the hole wall, thereby calculating the aperture value and verticality of the section.

The ultrasonic velocity is obtained through orifice calibration or set by empirical values.

What advantages our ultrasonic drilling monitor have?

Precautions when using the ultrasonic drilling monitor

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