Construction of centrifugally cast iron drainage pipes
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I am 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 specifications), 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 buried portion of cast iron drainage pipes on the ground floor inside buildings also usually requires anti-corrosion treatment, especially if the soil environment is humid or corrosive. Epoxy resin coatings or asphalt coatings can be used for corrosion protection. Regarding backfill material, medium-coarse sand is a common choice, as it provides good drainage properties and prevents mechanical damage to the pipes. According to the provisions of the \"Code for Construction and Acceptance of Building Water Supply, Drainage and Heating Engineering\" GB50242-2002, the backfill material should not contain sharp hard particles, frozen masses, or harmful impurities; medium-coarse sand meets these requirements. .