Matters need to attention when laying reinforced mesh

Concrete Reinforcing Mesh is a new, high-efficiency, energy-saving, reinforced concrete structure building material, which is widely used in airport runways, highways, tunnels, concrete pipes, bridges, multi-story and high-rise buildings, water conservancy dam foundations, wharves, warehouses, sewage treatment pools, etc. In the concrete structure. It has the advantages of improving structural strength, saving steel, saving labor, convenient transportation, convenient construction, high precision of grid arrangement, easy specialization, large-scale production, and high comprehensive cost performance.

The diameter of the concrete reinforcing mesh is 4-14mm, and 0.5mm graded diameter can be used in the meantime. Considering the transportation conditions, the length of the welded mesh should not exceed 12m, and the width should not exceed 3.4m. The spacing of the steel bars (or longitudinal bars) in the manufacturing direction of the welded mesh should be 100, 150, 200mm, and the spacing of the steel bars in the other direction is generally 100, 150, 200, 300mm, and sometimes up to 400mm.

When the longitudinal and longitudinal bars of the welded mesh are single bars, the nominal diameter of the thinner bars should not be less than 0.6 times the nominal diameter of the thicker bars, that is, dmin≥0.6damx. The shear resistance of the welded joint of the welded mesh (unit: N) should not be less than the product of 150 and the nominal cross-sectional area of the thicker steel bar (unit: mm2).

The construction of concrete reinforcing mesh should follow the rough laying of the initial spray surface, and the gap between the spray surface and the spray surface is generally no more than 3cm, and it should be firmly connected with the anchor rod (after the anchor rod device is 3d) or other fixing devices. If there are falling rocks during the eruption or when the concrete block is jammed by the construction steel mesh, it should be cleaned up in time before spraying concrete. When the eruption begins, the distance between the nozzle and the sprayed surface should be reduced, and the point of view of the eruption should be adjusted. The thickness of the protective layer of steel mesh should not be less than 4cm. The sand layer section should be laid and constructed with steel mesh, and then compressed in the circumferential direction before spraying the concrete. The constructed concrete reinforcing mesh should be spread 4cm after the initial sprayed concrete, and the thickness of the protective layer shall not be less than 2cm.