1) Steel expansion parts and expansion pipes should be made of stainless steel or carbon steel after surface treatment, metal expansion parts should be made of stainless steel or electro-galvanized steel, stainless steel should be made of A2, A4 or equivalent grades in the international standard "Mechanical Properties of Stainless Steel Fasteners" (ISO 3506); when electrogalvanized steel is used, it should comply with the provisions of the current national standard "Fastener Electroplating Layer" (GB/T 5267.1), and the thickness of the electroplating layer should not be less than μm. The mechanical properties, dimensions, tolerances and roughness of the parts shall conform to the design drawings and the current relevant national standards.
2) Plastic nails and plastic expansion sleeves with discs, as well as gaskets should be made of polyamide (polyamide 6, PA6 or polyamide 6.6, PA6.6), polyethylene (PE) or polypropylene (polypropylene, PP), and plastic nails and plastic expansion sleeves produced from recycled materials shall not be used in the project.
The nominal diameter of the disc anchor should not be less than 60mm (tolerance ± 1.0mm), and the nominal diameter of the expansion sleeve should not be less than 8mm (tolerance ± 0.5mm).
3) The standard value of tensile bearing capacity and pull-out force of a single anchor bolt. The anchor type, length and effective anchorage length should be based on the base wall material and design requirements. The technicality of the anchor bolt shall comply with the relevant provisions of the current national industry standard JG/T 366.