PVC casing: In the installation process, refer to the ±0 of civil engineering, determine the position and elevation of the casing according to the design drawings, and make the waterproof in the later stage. There are also requirements for the size of the casing out of the wall, and the casing is 20cm outside the outer wall. Also pay attention to the elevation in the design, some are the pipe bottom elevation, and some are the pipe center elevation (when the design is not required, the gravity flow pipeline is pre-embedded at the pipe bottom elevation, and the pressure pipeline is pre-embedded at the mid-pipe elevation) strictly in accordance with the drawings. Work.
The casing must be made in strict accordance with the standardized practices of the Atlas, and the casing shall be made of seamless steel pipes. The length needs to be communicated with civil engineering to determine the thickness of the shear wall, the size of the protective wall and 200mm of the overhanging wall, for processing, the casing cutting must not be gas welding, and a cutting machine must be used. The elevation and position are correct, the inner side is close to the template, not skewed, and the additional ribs are used for reinforcement, and the fixation is firm. The main reinforcement and casing of the civil construction cannot be damaged by welding. Match, do not open a square hole, fill it with felt and other materials, and paint the inside of the casing with anti-rust paint.
