In modern road and bridge construction, the sound tube plays a crucial role as an essential component of ultrasonic testing systems for cast-in-place piles. It is used to detect defects and ensure the structural integrity of the foundation. Among the various types of sound tubes available, the clamp pressure sound tube stands out due to its numerous advantages. It is simple to install, cost-effective, and offers reliable tensile strength with minimal loss during the process.
Clamp-type sound tubes are typically divided into two main categories: double-headed double-sealed and single-head welded. The single-head welding type is more commonly used in practice. These tubes come in standard outer diameters such as 50 mm, 54 mm, and 57 mm, with wall thickness ranging from 0.8 mm to 2.0 mm. However, it's important to note that the wall thickness cannot exceed 2.0 mm. This limitation is based on the working principle of the clamp pressure sound tube.
The clamp pressure method involves using hydraulic force to deform the tube, creating a tight connection by compressing the ends and reducing the middle section. This deformation ensures a secure seal through the radial contraction of a rubber O-ring. The clamping mechanism also prevents loosening by deforming the tube at the connection point, making the middle portion smaller and the ends larger. As a result, the joint becomes highly resistant to both pulling and twisting forces.
Additionally, the rounded protrusions of the sound tube reduce the risk of damaging the casing or the vibrator during installation. However, when the wall thickness exceeds 2.0 mm, the hydraulic clamping process may not be effective enough to flatten the tube properly. This can lead to incomplete compression, which compromises both the sealing performance and the pull-out resistance of the sound tube. Therefore, maintaining a wall thickness below 2.0 mm is essential for ensuring the reliability and effectiveness of the clamp pressure sound tube in construction applications.
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