Linfen acoustic test tube manufacturer's hardcover method

临汾声测管：

临汾声测管

临汾声测管：

临汾声测管

临汾声测管：

临汾声测管

The Inner Mongolia Linfen acoustic detection tube is the channel through which the probe enters the inside of the pile body when the cast-in-place pile is subjected to ultrasonic testing. It is an important part of the cast-in-place pile ultrasonic detection system. Its pre-embedding method in the pile and its layout on the cross-section of the pile will directly affect the detection results. Therefore, the layout and embedding method of Inner Mongolia Linfen acoustic pipes should be marked on the drawings when designing piles to be inspected, and the quality of embedding should be strictly controlled during construction to ensure the smooth progress of the inspection work. , Inner Mongolia Linfen Acoustic Detection Tube Selection
Inner Mongolia Linfen Acoustic Detection Tube material selection is based on the principles of greater sound transmittance, ease of installation and lower cost.
The acoustic pulse is emitted from the transmitting transducer, reaches the interface between water and the wall of the Inner Mongolia Linfen acoustic detection pipe through the coupling water, and then passes through the pipe wall to the interface between the wall of the acoustic detection pipe and the concrete. After passing through the concrete, it needs Pass through the two interfaces of another Inner Mongolia Linfen acoustic measuring tube to reach the receiving transducer.
Therefore, the Inner Mongolia Linfen acoustic measuring tube forms an interface, and the sound energy transmission coefficient of each interface can be calculated according to the following formula
The sound energy transmission coefficient of a certain interface in the formula
Both sides of the interface Acoustic impedance rate of the medium
The total sound transmission coefficient of the interface between the transmitting and receiving transducers is
Currently, commonly used pipes include steel pipes, steel corrugated pipes, and plastic pipes.
The advantage of steel pipes is that they are easy to install. They can be welded to the steel frame by electric welding and can replace part of the steel bar section. Moreover, due to the high stiffness of the steel pipes, they can basically maintain their parallelism and straightness. Currently, many large-diameter cast-in-place piles All use steel as the Inner Mongolia Linfen acoustic tube. But the price of steel pipes is relatively expensive
Steel corrugated pipes are a better material for acoustic pipes. They have the characteristics of thin pipe walls, less steel, impermeability, pressure resistance, high strength, and good flexibility. The post-tensioning method is usually used to reserve holes in prestressed structures when used as acoustic pipes in Linfen, Inner Mongolia. It can be tied directly to the steel frame soil, and the joints can be connected with one size larger corrugated socket. Because the bellows is very light, it is very easy to operate, but care must be taken to keep its axis straight during installation.
The acoustic impedance of plastic pipes is low. When used as Inner Mongolia Linfen acoustic measuring pipe, it has a greater sound transmittance. It can usually be used for smaller cast-in-place piles. Caution should be used when using large cast-in-place piles because of the large diameter piles. A large amount of concrete needs to be poured, and the heat of hydration of the cement is not easy to dissipate. Since the thermal expansion coefficient of plastic is very different from that of concrete, the plastic pipe will shrink radially and longitudinally due to the temperature drop after the concrete solidifies, which may cause it to partially detach from the concrete and cause The gap between air or water adds more strongly reflective interfaces to the sound path, which can easily lead to misjudgment.
The diameter of the Inner Mongolia Linfen acoustic measuring tube is usually larger than the diameter of the radial transducer. The common specification is the inner diameter. The wall thickness of the pipe has little impact on the sound transmission. Therefore, in principle, there is no limit on the thickness of the pipe wall. However, from the perspective of saving steel, as long as the pipe wall can withstand the lateral pressure of newly poured concrete, the thinner it will be. More provinces.
, The number and layout of the buried acoustic detection tubes in Inner Mongolia Linfen
The number and layout of the buried acoustic detection tubes in Inner Mongolia Linfen and the layout of the cross-section of the pile should take into account the detection control area. Usually there is an arrangement as shown in the figure. The shaded area in the figure is the detection control area.
Linfen acoustic measurement tube manufacturer’s hardcover method