1. Ordinary bolts shall comply with the current national standards hexagon head bolts - grade A B (gb5782) hexagon head bolts - grade C (gb5780);

2. The bolts anchor bolts used in steel reinforced concrete members shall be Q235 steel specified in carbon structural steel GB700 Q345 steel specified in low alloy high strength structural steel GB / t1591;

3. High strength bolts shall comply with the provisions of the current national standard "high strength large hexagon head bolts, large hexagon nuts, washers technical conditions for steel structures" (GB / T 1228-1231) "torsional shear type high strength bolt connection pairs for steel structures" (gb3632-gb3633);

4. Welded section steel rolled section steel can be used. The grade material of section steel shall be selected according to the structural characteristics. The tensile strength, elongation, yield point, cold bending test, impact toughness sulfur, phosphorus carbon content shall meet the requirements. The weld groove dimensions of section steel shall comply with the current industry standard "technical specification for welding of building steel structures" (JGJ) When the thickness of welded section steel plate is greater than equal to 50 mm bears the tensile force along the thickness direction, the current national standard steel plate with performance in thickness direction (GB) shall be adopted According to 5313, the reduction of area along the thickness direction of the additional plate shall be less than the allowable value specified in the standard z15. The strength yield ratio of structural steel considering earthquake action shall be less than 1.2, shall have obvious yield step good weldability;

5. The strength design value of bolt connection, the design pre tension value of high strength bolt, the anti sliding coefficient value of steel friction surface of high strength bolt connection shall be adopted according to the current national standard "code for design of steel structures" (GBJ17);

6. The welding of section steel shall meet the following requirements:

a> The welding rod for manual welding shall comply with the current national standard carbon steel electrode GB 5117 low alloy steel electrode GB 5118. The selected electrode type shall be suitable for the strength of the main metal;

b> The welding wire flux used in automatic welding semi-automatic welding shall be suitable for the strength of the main metal. The welding wire shall comply with the current national standard steel wire for fusion welding (GB / T 14957);

7. The bolt anchor bolt materials used for section steel shall meet the following requirements:

a> Ordinary bolts shall comply with the current national standards hexagon head bolts - grade A B (GB 5782) hexagon head bolts - grade C (GB 5780);

b> Q235 steel specified in current national standard carbon structural steel GB 700 Q345 steel specified in low alloy high strength structural steel GB / T 1591 can be used as anchor bolt;

c> High strength bolts shall comply with the provisions of the current national standard high strength large hexagon head bolts, large hexagon nuts, washers technical conditions for steel structures (GB / T 1228-1231) torsional shear type high strength bolt connection pairs for steel structures (GB 3632-gb 3633);

Suzhou Maolong Elevator Accessories Co., Ltd. products (elevator expansion bolts, Anka anchor bolts, etc.) are widely used in machinery, automobile, decoration, railway bridge, steel structure plant elevator company. It cooperates with universities, design institutes industrial research institutes to carry out various research development plans, so as to continuously improve R & D design ability. In addition to OEM, it is also an international ICI, air professional Supporting manufacturers.