1. When the upstream surface is corrosive medium, the gap can be sealed with sealing materials. See the waterproof casing atlas for the practice; Installation drawing of flexible waterproof sleeve (Type A).
2. Filler materials of flexible waterproof casing: asphalt hemp fiber, polystyrene board, PVC foam plastic board.
3. Sealing paste: polysulfide sealing paste, polyurethane sealing paste.
4. The dimensional tolerance and geometric tolerance of welding structure shall comply with JB/T5000.3-1998. Manual arc welding is adopted for welding, and the welding rod model is E4303, and the brand is J422. The basic shape and size of weld groove shall comply with GB985-88.
5. When flexible waterproof casing is rolled, the allowable deviation of perimeter is D2 ≤ 600, D2>600 ± 0.0035D2.
6. The thickness of the concrete wall where the wall passes through shall not be less than 300, otherwise the wall shall be thickened on one side or both sides, and the diameter of the thickened part shall be at least D5+200. 7. The weight of flexible waterproof casing shall be calculated with L=300. If the wall thickness is greater than 300, it shall be calculated separately.
8. If a non concrete wall is encountered at the place where the flexible waterproof casing passes through the wall, the concrete wall shall be used locally, and the pouring range shall be 200 larger than the wing ring diameter (D5). Moreover, the casing must be poured at one time in the fire pool of the inner wall to prevent the use of flexible waterproof casing in the middle. Because the equipment has a certain function of preventing water from seeping, flowing and flowing to the lower layer, the "prevention" here has two aspects: on the one hand, it refers to that after the completion of the project, the user, during the decoration stage, causes the running water to flow through the casing pipe to the lower layer due to improper reasons; On the other hand, after the user enters the station, the accident causes the running water to flow through the casing to the lower layer, and the former is often more than the latter. When the rigid waterproof sleeve passes through the pipeline or other cables, it needs to be plugged into the gap with jute and other sealants. The sealing performance is poor, and it cannot be used in the flexible waterproof sleeve with high sealing requirements. Because it has a closed wing ring and protective resistance plate, it should be treated carefully when the pipeline passes through the closed partition wall, and it is not allowed to use reserved holes.