luoying to tell you what is the difference between rigid waterproof casing and ordinary casing?

Rigid waterproof casing and ordinary casing there is not much difference between the two, rigid waterproof casing is ordinary through the wall casing, rigid waterproof casing than ordinary casing more than a water stop wing ring, installed in the wall, mostly concrete walls, for general piping through the wall, conducive to the waterproofing of the wall. General casing is steel pipe with filler; waterproofing is to add a wing ring: flexible with 3 rings and rubber ring, rigid 1 ring, regardless of the flexible and rigid there are points A, B, C three cases. Only waterproof requirements, the use of rigid waterproof casing; not only waterproof, there are anti-vibration, anti-displacement requirements, the use of flexible waterproof casing.
Waterproof casing: pipeline through the railway, road, street, etc., in order to prevent the pipeline by the load is crushed, and set up outside the pipeline protective casing, such as: large diameter concrete pipe, large diameter steel pipe, etc. to avoid external forces (load) directly on the outer wall of the pipe, resulting in pipe breakage, and measures taken.
Rigid waterproof casing is suitable for pipeline through the wall does not bear the pipeline oscillation and expansion deformation of the structure (building) buildings, generally used in the basement and other pipelines need to wear the pipeline location, to avoid casing within the pipeline liquid leakage.