Points to note for through-wall casing construction

   Underground through-wall casing is commonly encountered in building construction such as drainage pipes, gas supply pipes, heating pipes, strong and weak electrical conductor pipes, etc., all need to be concealed from the outdoor underground through the wall into the basement. There are two kinds of requirements for through-wall casing through the wall, namely, not waterproof and waterproof.
   General no basement through the wall casing can be directly from the root inside through the wall casing to do anti-corrosion treatment for pre-burial, after wearing the pipe for general blocking can be. After the pipeline through the wall, the first rubber seal is used to seal the treatment, and the other side of the waterproof casing is filled with flexible sealing materials such as polyurethane, oil hemp and other waterproof materials to seal the waterproof casing, common use areas such as basement and subway waterproofing, septic tank waterproofing, etc.




1. pre-built casing with the wall thickness. Its pipe diameter must be greater than the diameter of the pipe through the wall of two diameter number. Such as pipe diameter is DN80, the diameter of the pre-buried casing is DN125.

2. The water stop ring of the pre-buried casing can use steel plate ring cut, there shall be no fracture and mutilation.

3. When the pre-buried casing is placed and fixed, it can be slightly sloped to the outside. It is prohibited to slope backwards to the interior.

4. After the casing is made, the inner wall should be anticorrosive treatment, anticorrosive to brush two times of antirust paint. Then brush one anti-corrosion asphalt paint.