Construction of centrifugally cast iron drainage pipes
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This post was last edited by wwl588 on 2025-4-25 at 17:16. We are currently working on a university dormitory building, and the sewage pipes are designed to be made of cast iron. Is it necessary to apply anti-corrosion treatment to the buried portion on the first floor inside the building? (As not specified in the design drawings and instructions), if anti-corrosion treatment is required, what should be used? Also, when backfilling after the installation of drainage pipes on the ground floor indoors, is it necessary to use medium-coarse sand for backfilling? If so, is there any regulatory basis? The design specifies flange connections for underground installation and clamp connections for surface installation
When cast iron drainage pipes are used underground in indoor areas, it is generally recommended to apply anti-corrosion treatment to enhance the durability of the pipes and prevent corrosion. Appropriate anti-corrosion materials can include epoxy resin coatings or zinc-rich primers, etc. As for the backfill material, it is indeed necessary to use medium-coarse sand for backfilling and to ensure good compactness; this helps prevent damage to the pipes caused by hard objects and ensures the stability of the ground. **The standard \"Code for Acceptance of Construction Quality of Building Water Supply, Drainage and Heating Engineering\" GB50242-2002 provides relevant construction and acceptance criteria that can be referred to. .