- 江苏声测管厂家：
- 江苏声测管厂家
- 江苏声测管厂家：
- 江苏声测管厂家
- 江苏声测管厂家：
- 江苏声测管厂家
Jiangsu
< )
< ). The common specification is the inner diameter . The wall thickness of the pipe has little effect on the sound transmittance
< ), because, in principle, there is no restriction on the thickness of the pipe wall, but from the perspective of saving the amount of steel used, the pipe wall thickness The wall only needs to be able to withstand the side pressure of newly poured concrete, and the thinner it is, the more economical it is. < r_
< >The acoustic impedance of plastic pipes is low, and the pipe has a greater sound transmittance when whistled. It can generally be used for smaller cast-in-place piles. In heavy-duty Caution should be exercised when using cast-in-place piles, because large-diameter piles require a small amount of concrete to be poured, and the heat of hydration of lime is not easily dispersed: since the thermal contraction coefficient of plastic is very different from that of concrete, the plastic pipe will produce radial distortion due to the drop in measurement after the concrete solidifies. And longitudinal expansion may cause it to completely separate from the concrete and form a gap of air or water. More interfaces with strong reflections will be added to the acoustic circuit, which may easily lead to misjudgment.
< >Steel corrugated pipe is a better acoustic pipe material. It has the characteristics of thin pipe wall, less steel, high impermeability and compressive strength and good flexibility. It is generally used for prestressing. The post-tensioning method in the structure is reserved for important points: when measuring pipes with a whistle. It can be tied directly to the steel frame, and the joints can be sleeved with a larger corrugated pipe. Because the corrugated tube is very light, it is very easy to operate, but care must be taken to keep its axis straight during installation.
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