The function of acoustic measuring tube

Commonly used pipes have steel pipe, steel corrugated pipe, 3 kinds of plastic pipe.

The advantages of the steel pipe are easy to install, can be welded in the steel skeleton outside, may replace some of the steel section, and because of the rigidity of the steel pipe. After embedding can basically maintain its parallelism and flatness, many large-diameter cast-in-situ piles are used as pipe for sound measurement. But the price of steel pipe is more expensive:

Steel corrugated pipe is a kind of good sound tube material, it has the characteristics of thin pipe wall, steel and anti-seepage, pressure, high strength, good flexibility, usually used in pre-stressed structure of the post-tensioned method to reserve the channel: When using a silent test tube. Can be directly binding on the reinforcing steel skeleton, the joint can be used in a large corrugated pipe socket. Because the bellows is very light, so the operation is very convenient, but the installation should pay attention to keep its axis straight.

The sound impedance ratio of plastic pipes is low, it is used for the sound measuring tube has the large penetration rate, usually may use in the small pouring pile, in the large-scale pouring pile application should be cautious, because the big diameter pile needs to pour the massive concrete, the cement's hydration heat is not easy to diverge: In view of plastic thermal expansion coefficient and concrete difference, After the solidification of the concrete tube due to the temperature drop of the radial and longitudinal contraction, it is possible to make it with the concrete part of the cracks caused by the air or water, in the sound path and added more reflective interface, easy to cause miscarriage.

The diameter of the acoustic tube is usually larger than the diameter of the radial transducer l0mm, the common specification is the inner diameter 50-60mm. The wall thickness of the pipe has a small effect on the penetration rate, so there is no limit on the thickness of the pipe wall, but from the angle of saving the steel, the pipe wall can withstand the lateral pressure of the newly poured concrete, the thinner the more the more. 650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/71/5B/wKioL1XMXkySnnKeAAdNhRXQY_s101.jpg "title=" 2.jpg " alt= "Wkiol1xmxkysnnkeaadnhrxqy_s101.jpg"/>

This article from the "Sound Test tube" blog, declined reprint!

The function of acoustic measuring tube