2. When hanging double-layer steel mesh, the second layer steel mesh shall be laid after the first layer steel mesh is covered with concrete and finally set.
3, steel mesh with the initial spray surface ups and downs laid, and the spray surface clearance is not less than 3cm, and firmly connected with anchor or other fixed devices.
4. The lap length of steel mesh is1~ 2 meshes, and it is welded, with an allowable error of 50 mm. 。
5. When hanging the net, there are stones or concrete blocks that fall off, and when they are caught by the steel network card, they should be removed in time.
6, welder welding must wear protective clothing, standing on the board or other insulation.
7. Electric welding machine lines and equipment conform to "one machine, one brake, one box and one protection".
8. Pay close attention to the peeling and collapse of surrounding rock or shotcrete during construction, and pay attention to the stability of support or slag heap.
In addition, the thickness of the protective layer should not be less than 30 mm. The mesh forms a whole, and the welding place should be firm.
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