1. Positioning: according to the design requirements, use the rebar detector (to avoid the rebar) to accurately determine the location of the drill hole. 2. Drilling: electric impact drill shall be used to drill holes at the determined location according to the design requirements (high level, hole diameter). In order to ensure that the role of anchored reinforcement can be fully played, the embedding and hole diameter of reinforcement shall be strictly in accordance with the design requirements. When drilling, the structure of the original concrete component shall not be damaged, and the original main reinforcement and other load-bearing reinforcement of the component shall not be cut. The hole wall after hole forming must be intact without cracks, honeycombs or holes. (If the hole does not coincide with the position of component reinforcement, the hole for expansion bolt shall be arranged according to the design drawing; if the hole and component
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