1) Steel expansion joints and expansion tubes should be made of stainless steel or surface-treated carbon steel. Metal expansion joints should be made of stainless steel or electro-galvanized steel. Stainless steel should meet the A2, A4 or equivalent grades in the international standard "Mechanical Properties of Stainless Steel Fasteners" (ISO 3506). When electro-galvanized steel is used, it should comply with the current national standard "Electroplated Coatings of Fasteners" (GB/T 5267.1), and the thickness of the electroplated coating should not be less than μm. The mechanical properties, dimensions, tolerances, and surface roughness of the parts should conform to the design drawings and the relevant current 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 (PP). Recycled plastic nails and plastic expansion sleeves must not be used in engineering projects. The nominal diameter of the disc in a disc anchor should not be less than 60 mm (tolerance ±1.0 mm), and the nominal diameter of the expansion sleeve should not be less than 8 mm (tolerance ±0.5 mm).
3) Standard values for the tensile bearing capacity and pull-out force of a single anchor. The anchor type, length, and effective anchorage length should be based on the base wall material and design requirements. The technical specifications of the anchors should comply with the relevant provisions of the current national industry standard JG/T 366.
