Setting rules for bridge anti-throwing net

Summarize the setting rules for bridge anti-throwing nets

 

The anti-throwing net of the bridge is suitable for the upper span bridge of concrete guardrail. The distance of the anti-falling net is 2m. The expansion bolt should pay attention to the proper maintenance of the exposed part of the bolt, prevent the pillar from being caught and the connecting plate, and the ground flat steel should ensure the welding as one. The connecting plate is fixed by an expansion bolt;

 

Except for fasteners and expansion bolts, which are treated by hot dip galvanizing, other components should be hot dip galvanized and then plastic coated. The dotted line in the figure is the bending point of the connecting plate. The grounding resistance of the anti-falling net should be less than 10. If the requirement is not met, the amount of angled steel of the grounding body can be increased. The angle of the angle steel is 5m. The flat steel is connected. The end of each anti-fall net is just the ground and the length of the angle steel. The amount of work that occurred is subject to change. Please contact the planner in time for any questions or unfinished matters.

 

All steel components are made of A3 steel, and its mechanical properties should meet the requirements of GB/T13793. Before welding, each monomer is required to correct straightness and remove burrs. The welding parts require excessive oil-slip, no welding defects such as slag inclusion, virtual welding, and pores. After the construction of the group is welded, the overall correction is required. The overall curvature of the plastic after shaping is not more than 7mm. The plastic coating layer must be uniform and shiny, and must not exist. Pinholes, flow accumulation, coating thickness > 0. 25mm, color is green, it seems to require detailed reference GB/T18226 "road traffic engineering steel components anti-corrosion skills."

 

The bridge anti-throwing net fasteners are hot-dip galvanized, the galvanizing capacity is 120g/m2, and a diagonal bracing is arranged every 60m in the longitudinal direction or the steering position. The bottom of the bridge anti-throwing net column is bored with a hole diameter of 11mm. When constructing the column, wear 30cm long steel bar to enhance the stability of the column.