Steel mesh is reinforced by the longitudinal and transverse cross made by lashing or welded. Ministry of Construction is "focused on the promotion construction 2005? 10 new technology," one of the elements. Reinforcing mesh used in industrial and civil housing floor beams, roof, walls, concrete pavement, pavement, airport runway, tunnel lining, culvert, dock floor, precast and other fields. Welded steel bar diameter 4-14mm, which can be used to upgrade 0.5mm diameter. Consider transportation, welded mesh length should not exceed 12m, width should not exceed 3.4m. Welded steel mesh production direction (or longitudinal bars) spacing appropriate for 100,150,200mm, another direction reinforcement spacing is generally 100,150,200,300mm, sometimes up to 400mm. When the vertical and horizontal welded steel bars are single, thin steel nominal diameter shall be not less than the nominal diameter thick steel 0.6 times, that dmin≥0.6damx. Welded joints of shear force (in N) should not be less than 150 and coarse steel nominal cross-sectional area (in mm2) of the product. Shotcrete should be located in the ribbed steel mesh, shotcrete help improve the shear and flexural strength, improve the punching shear resistance of concrete, bending resistance, improve the integrity of shotcrete, shotcrete reduce shrinkage cracks, prevent Local off the block. Steel mesh grid should a rectangular arrangement, reinforced steel mesh spacing of 150 ~ 300mm. It may be 150mm × 150mm, 200mm × 200mm, 200mm × 250mm, 250mm × 300mm, 300mm × 300mm in combination. Lap length steel mesh of not less than 30d (d for the bar diameter). The thickness of the protective layer of sprayed concrete reinforcing mesh not less than 20mm, when using double steel mesh, the separation distance between two layers of steel mesh of not less than 60mm. Welded steel mesh of longitudinal reinforcement and transverse ribs form a network structure, thus anchoring good bond with concrete, steel mesh to withstand the load evenly spread distribution, significantly improve the seismic behavior of reinforced concrete structures crack. According to the actual test, road paving welded steel mesh over manual to help tie network, more than 75% can reduce the occurrence of cracks. 3. To save a round steel plate steel mesh design strength steel consumption is now heavily used 210N / mm (pingfang), while the design strength of welded steel mesh is 360N / mm (pingfang), according to the principles of equal strength and updating, consider a combination of factors use of welded steel mesh can save the amount of steel used for more than 30%. And steel mesh transported to the site need to be processed, so there is no loss. The steel mesh can speed up the construction progress using welded steel mesh, can change the construction project quickly. As long as the required steel mesh placement is good, you can pour concrete, eliminating the need for reinforced scene cut, one by one place and help tie other links. Steel mesh can save hours of work to 50% --70%, greatly accelerate the construction schedule to shorten the construction period. Edit this paragraph 1 prospect, welded steel mesh construction walking path is the trend of the world steel industry. 2, steel mesh reinforcement in the form of this new, especially for large area concrete engineering. 3, of cold drawn ribbed steel bars, hot rolled steel grade III widespread and rapid application of the material to provide a good foundation for the development of welded mesh. Welded mesh product standards and the use of procedures formally implemented, to improve product quality, accelerate the popularization and application played a positive role. 4, China's huge potential market demand for steel mesh. 5, steel mesh aesthetically pleasing. 6, China is the world steel big country.