1. Structural Characteristics

Sonic logging pipes are constructed with high-strength seamless steel pipes or precision cold-drawn steel pipes as the primary material, ensuring excellent straightness and uniform wall thickness (typically ranging from 3mm to 8mm) to guarantee stable acoustic wave transmission. The inner wall of the pipe is precision-processed to maintain a smooth surface, avoiding interference with acoustic signals. Both ends of the pipe are equipped with standardized threaded joints or socket-and-spigot connections, which feature airtight sealing structures (such as rubber gaskets) to prevent the entry of mud, water, or other impurities during pile construction. For large-diameter piles, multi-pipe combinations (e.g., triangular or square arrangements) are available to cover the entire cross-section of the pile foundation.

2. Core Functions

As a key detection component in pile foundation integrity testing, sonic logging pipes serve as acoustic wave transmission channels for cross-hole sonic logging: After the pile concrete is poured and initially set, ultrasonic transducers are lowered into the paired sonic logging pipes. One transducer emits ultrasonic waves, while the other receives the transmitted waves. By measuring parameters such as acoustic wave velocity, amplitude, and waveform in the concrete between the pipes, the integrity of the pile foundation (including the presence of internal defects like voids, cracks, or segregations) can be accurately evaluated. The pipes also provide a stable guide for the transducers, ensuring that the detection path remains consistent and the test results are reliable.

3. Typical Application Scenarios

Widely used in the quality detection of cast-in-situ bored piles, pipe-sinking cast-in-situ piles, and other pile foundation types in construction projects such as high-rise buildings, bridges, highways, and railways;

Essential for large-diameter pile foundations (with a diameter exceeding 800mm) where single-hole sonic logging is insufficient to cover the entire cross-section;

Applicable to both newly constructed pile foundations and the re-detection of existing pile foundations with suspected quality issues, providing data support for engineering acceptance and safety assessment.

4. Differences from Similar Products

Sonic logging pipes should be clearly distinguished from "grouting pipes" (e.g., tunnel steel perforated pipes): The former is dedicated to non-destructive testing of pile foundations, focusing on acoustic wave transmission performance and structural tightness, and is not involved in material injection; the latter is mainly used for reinforcement through grouting, emphasizing the design of perforations and pressure-bearing capacity. Additionally, compared to ordinary steel pipes, sonic logging pipes have stricter requirements for material uniformity and dimensional precision, as common steel pipes may cause signal distortion due to poor straightness or rough inner walls, affecting detection accuracy.