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The edge keel usually uses L (U) - shaped galvanized light steel bars, and its fixing method varies depending on the base material. If the base layer is a concrete wall column, it can be fixed with nails and ensure that the spacing between nails does not exceed the spacing of the ceiling keel. During the fixing process, it is generally recommended to use high-strength cement nails with a nail spacing of no more than 500mm. If the strength of the base material is low or the fastening force is poor, corresponding measures should be taken, such as using expansion bolts or increasing the length of the nails, to ensure stability.