luoying explains the role of waterproof casing.

This article mainly on the role of waterproof casing to do a little introduction, first of all, the classification and application of waterproof casing, waterproof casing can generally be divided into three types: flexible casing, rigid casing and rigid waterproof wing ring. In the basement walls and civil construction projects pool, usually use rigid waterproof casing. Flexible waterproof casing is mainly used for the entrance of various pumps on swimming pools, while rigid waterproof wing rings are used relatively rarely, except, of course, for special requirements.
 
Waterproof casing should be provided when the pipe passes through walls and floors where waterproofing is required. The main function is to optimize the waterproof structure of the pipeline part, facilitate the detailed treatment during the construction of the waterproof layer, avoid damage to the waterproof layer caused by temperature and other stresses, and keep the waterproof layer in good condition. It is used between the surface of the slab and the surface of the shear wall to prevent water seepage. Flexible waterproof casing is a hardware fitting for structures with vibration or strict waterproofing requirements when pipes pass through walls. Generally manufacturers manufacture flexible waterproof casing in accordance with S312,02S404 standard drawings designed for scientific research systems. The wall through which the casing passes should be replaced by a concrete wall if it is not concrete, and the casing is cured once in the wall. Flexible waterproof casing is widely used in construction, chemical industry, steel, water, sewage treatment and other units. Rigid waterproof casing is a steel pipe with a wing ring (a ring made of steel plate is placed on the steel pipe), which is installed in the wall (mainly concrete wall). It is used for general pipes passing through walls for waterproofing of walls. In addition to outer wing rings, retaining rings, etc., flexible waterproof casing with inner flanges of flanges is sold in sets or can be processed on its own for pipes that require vibration damping, such as when pipes connected to pumps pass through walls. Both flexible and rigid waterproof casing are suitable for pipes passing through the walls of buildings that are subject to vibration or have strict waterproofing requirements. They are commonly used in construction, chemical industry, steel, water, sewage treatment and other units.