:: Also known as welded steel mesh welded steel mesh, welded steel, welded mesh. Longitudinal bars and transverse reinforcement are respectively arranged at a constant pitch and at right angles to each other, all cross points of the mesh are welded together. Steel mesh used in industrial and civil buildings of floor beams, roof, walls, concrete pavement, bridge deck, airport runways, tunnel lining, culvert, dock floor, precast and other fields. Advantages of welded steel mesh: 1, welded steel factory under strict quality control, manufactured by automated, intelligent production line together. Mesh size, steel specifications and quality have been strictly controlled. Steel mesh used in industrial and civil buildings of floor beams, roof, walls, concrete pavement, bridge deck, airport runways, tunnel lining, culvert, dock floor, precast and other fields. Surface shape:? Mesh welded steel mesh reinforcement longitudinal and transverse reinforcement were arranged in a certain distance and at right angles, all cross joints are welded together steel mesh. Role: concrete with plate materials industry standards: YB / T076-1995 advantages: good structural quality and high safety and reliability Basic Introduction Welded steel mesh reinforced concrete is suitable for the manufacture of days in the factory, cold-rolled or cold-rolled ribbed steel band of light Round steel welded steel mesh welded steel mesh reinforced concrete, is a good and efficient use of concrete with a plate material. It appears to improve the efficiency of building construction, construction quality and safety and reliability, to change the traditional building construction methods are of great importance and can be used in reinforced and prestressed concrete structures reinforced concrete structures. In order to regulate the production and use of this material, promote the improvement of the level of industrialization of China's construction industry, especially the development of the industry standard YB / T076-1995. The standard definition information using the following definitions: 1.1 steel mesh: longitudinal reinforcement and transverse reinforcement were arranged in a certain distance and at right angles to each other, all intersections are welded steel mesh. 1.2 Smooth cold rolled steel: hot rods after reducing cold-rolled or cold-drawn steel made smooth, and its cross-section is generally circular. 1.3 longitudinal reinforcement: with steel mesh manufacture aligned parallel to the direction of reinforcement. 1.4 transverse reinforcement: manufacturing and steel mesh reinforcement direction vertically aligned. 1.5 Spacing: The distance between the centerline of reinforced steel mesh in adjacent double root for steel, reinforced the centerline of the two common tangent point of contact. 1.6 pairs of root reinforcement: steel mesh close together in the same type, with a diameter of two bars. 1.7 extended length: vertical, horizontal various steel mesh reinforcement beyond the outermost horizontal, vertical centerline of the length of reinforcement for reinforced double root, the centerline of the common tangent of two steel contact points. Length 1.8 steel mesh: the long side of the plane steel mesh size (nothing to do with the manufacturing direction). Steel mesh width of 1.9: flat steel mesh size of the short side (nothing to do with the manufacturing direction). Material information should be used steel mesh diameter 2.1 GB / T 13788 stipulated for LL 550 4mm ~ 12mm of cold rolled ribbed steel also used in line with the provisions of the table a diameter of 4mm ~ 12mm of LG550 grade cold-rolled steel smooth. Cold-rolled ribbed steel codenamed LL550 (L, L, respectively, for "Cold" and "ribbed" pinyin prefix, 550 standard values ??for tensile strength steel 550MPa). Cold rolled steel codenamed smooth (standard value L, G, respectively, for "Cold" and "smooth" pinyin prefix, 550 for steel tensile strength 550MPa) LG550. Table a, the mechanical properties of cold-rolled steel reinforced smooth nominal diameter (mm) yield strength σ0.2 (MPa) Tensile strength σb (MPa) Elongation δ10 (%) 180 ° D- cold-formed curved steel nominal core diameter D- diameter ≤5 ≥00 ≥550 ≥8 D = 3d 5 ≥10 2.2 recommended rebar diameter 5,6,7,8,9,10,12mm. 2.3 longitudinal reinforcement can be used single or double root reinforcement, transverse reinforcement should be only a single root reinforcement. 2.4 in the same vertical and horizontal steel mesh reinforcement dimensions can vary, but generally in the same direction with the same dimensions of the reinforcement. 2.5 are single longitudinal and transverse reinforcement bars, the bar diameter should be consistent with the requirements of the following formula. dmin≥0.6dmax formula: dmax- thick steel nominal diameter; dmin- smaller nominal diameter rebar. When using double root longitudinal reinforcement bars, rebar diameter should comply with the requirements of the following formula: 0.7dt≤dl≤1.25d formula: dt- transverse reinforcement nominal diameter; public dl- one double root reinforcement diameter. Dimensional inspection 3.1 longitudinal reinforcement steel mesh spacing of integer multiples of 50mm, 25mm transverse reinforcement spacing should be integer multiples of the minimum spacing are advised to adopt 100mm. 3.2 rebar protruding length should not be less than 25mm. Quality Inspection steel mesh surface stains and other defects shall not affect the use, allowing a burr, rust and surface sampling reinforced locally produced vacancies. Quality steel mesh nominal composition reinforced by nominal diameter and calculate the required size, when calculating the density of steel using 0.00785g / mm. Steel mesh actual quality and nominal mass tolerance of ± 4.5%. 6.1 steel mesh can be shaped into stereotypes and customized steel mesh steel mesh two kinds. 6.2 get fixed steel mesh in both directions reinforcement spacing and diameter can be different, but with the same bar diameter in one direction, the same pitch and the same steel reinforcement length. 6.2.1 stereotypes steel mesh to "vertical reinforcement spacing × transverse reinforcement spacing - longitudinal reinforcement diameter × intensity level and the intensity level and the diameter of the transverse reinforcement - mesh mesh length × width" to mean, for example: 100mm × 200mm-LL550,100mm × LL550,8mm-4800mm × 2400mm 6.2.2 recommended stereotypes steel mesh are listed in Table b. Stereotypes steel mesh models by longitudinal reinforcement spacing points A, B, C-III, combined with longitudinal reinforcement per meter area (mm / m), said. For example: A 252 meter area of ??longitudinal reinforcement per 252 mm / m, vertical reinforcement spacing is 200mm Type A steel mesh. Table b, recommended stereotypes steel mesh steel mesh model of longitudinal reinforcement transverse reinforcement mass (kg / m) nominal diameter (mm) pitch (mm) per meter area (mm / m) nominal diameter (mm) pitch (mm) per meter area (mm / m) A393 A381 A252 A193 A142 A98 10 9 8 7 6 5 200 393 318 252 193 142 98 10 9 8 7 6 5 200 393 318 252 193 142 98 6.16 4.99 3.95 3.02 2.22 1.54 B523 B423 B335 B257 B189 B131 10 9 8 7 6 5 150 523 423 335 257 189 131 10 9 8 7 6 5 200 393 318 252 193 142 98 7.19 5.82 4.61 3.53 2.60 1.80 C1131 C785 C636 C503 C385 C283 C196 12 10 9 8 7 6 5 100 1131 785 636 503 385 283 1,968,888,777,200,252,252 252,252,193,193,193 10.9 8.14 6.97 5.93 4.53 3.73 3.05 6.3 launched customized steel mesh shape, size should be based on the demand side, negotiated by both parties, and design shows. 7.1 steel mesh manufacturing information should be used in machinery manufacturing, longitudinal, transverse reinforcement crossing point using resistance welding. 7.2 crosspoint open welding steel shall not exceed 1% of the entire total of mesh intersections. And any open solder points on a steel rod shall not exceed one half of the total number of the root reinforcement intersection. Intersection of reinforced steel mesh on the outermost not open welding. Mechanics, bending performance process performance 8.1 steel mesh shall conform to the provisions and table a GB / T13788 for LL550 grade cold-rolled ribbed steel cold rolling on smooth steel LG550 level requirements. 8.2 steel mesh pads shear force (in N) shall be not less than 150 and thicker steel nominal cross-sectional area (in mm) of the product. Packaging Information 9.1 steel mesh should be neatly tied, solid, heavy bundles should not exceed 2t, when necessary, add a rigid support or supports to prevent the transport lifting process steel mesh deformation affect use. Application Information 1, welded steel mesh in the application of reinforced concrete pavement cement concrete pavement engineering with a minimum diameter welded steel mesh and the maximum spacing shall comply with the provisions of the standard JTG D40 "cement concrete pavement design specifications" of existing industries. When using cold-rolled ribbed steel bar diameter of not less than 8mm, longitudinal reinforcement spacing should not exceed 200mm, transverse reinforcement spacing should not exceed 300mm. The vertical and horizontal steel welded mesh should adopt the same diameter, reinforced protective layer thickness of not less than 50mm. Reinforced concrete pavement reinforcement welded reinforced concrete pavement can be used to perform with the relevant provisions of the welded mesh. ⑴, when the concrete pavement structure convergence of fixed expansion dowel joints can not be set, you can configure double-welded steel mesh in the adjacent structures of the plate ends; or within a length of about 6 to 10 times the thickness range gradually increase the thickness of 20%. ⑵, concrete pavement and bridge phase, the bridge has a slab, you should set a long 6 10mm reinforced concrete slab surface transition between the slab and the concrete surface laminates. When the bridge is oblique, acute part of the reinforced concrete slab shall be welded steel mesh reinforcement. ⑶, under the surface layer of concrete box-shaped transverse cross structures, its distance from the top surface to the bottom surface of the surface layer is less than 400mm or embedded at the grassroots level, at the top width and side structures, concrete surface should be laid double welded steel mesh, welded steel mesh on the lower surface of each layer from the top and bottom 1/4 of a thickness of 1/3 point. Under the concrete surface with a circular transverse cross tubular structures, its distance from the top surface to the bottom surface of the surface layer is less than 1200mm, at both sides of the structure, should be laid in the concrete surface layer single welded steel mesh, welded steel mesh surface located at a distance Layer 1/4 of the top surface at a thickness of 1/3. From the industry standard "cement concrete pavement design specifications" JTG D40-2002 2, welded steel mesh in the application is mainly used in bridge engineering municipal bridges and highway bridge deck pavement, the transformation of the old bridge, pier crack and so on. Thousands of bridges through domestic application engineering quality inspection showed that the welded bridge deck pavement significantly improve the quality of the protective layer thickness pass rate of more than 97% increase flatness bridge deck almost no cracks, paving speed more than 50%, reduce bridge deck about 10% of the project cost. Welded steel mesh deck pavement should be used or pre-welded cold-rolled ribbed welded steel mesh, welded steel mesh banding should not be used. Bridge deck and with a diameter welded steel mesh spacing should be determined on the basis of the bridge structure and the load rating. Welded steel gateway can be used from 100 to 200mm, its diameter should adopt a 6 l00mm. Welded steel mesh vertical and horizontal spacing should be used equally, welded mesh from the top surface of the protective layer thickness of not less than 20mm. 3, welded steel mesh in the tunnel lining applications according to GB "highway tunnel design specification" JTGD70-2004 regulations. Shotcrete should be located within the zone of welded steel mesh, shotcrete help improve the shear and flexural strength, improve the anti-punching ability of concrete, bending resistance, improving the integrity of shotcrete, shotcrete reduce shrinkage cracks, prevent local swap blocks. Welded steel mesh grid should be arranged in a rectangular, steel welded steel mesh spacing of 150 ~ 300mm. May be 150mm × 150mm, 200mm × 200mm, 200mm × 250mm, 250mm × 300mm, 300mm × 300mm in combination. Lap length welded steel mesh of not less than 30d (d for the bar diameter). The thickness of the protective layer of shotcrete welded steel mesh of not less than 20mm, when using double-welded steel mesh, welded steel mesh spacing distance between the two should not be less than 60mm. Domestic welded steel mesh welded steel mesh development situation a production capacity of cold-rolled ribbed steel bars in the late 1980s to begin production in the country, more than 10 years, especially in recent years, rapid development, has become the focus of the promotion of the Ministry of Construction of new steel grades . The rapid development of cold-rolled ribbed steel bars, providing good conditions for the development of welded mesh. Our standard welded mesh products came into force in December 1995, to guide production to ensure product quality is of great significance. Using the procedure also in February 1998 formally implemented, to accelerate the popularization and application play a positive role in promoting. Technical specification provides two welded steel mesh technical requirements, welded mesh should adopt CRB550 grade cold-rolled ribbed steel production, may also CRB510 grade cold drawn smooth steel production. One should adopt the same type of welded steel welded. Welded mesh according to the shape, size is divided into two kinds of styling and customization. Stereotypes welded mesh in both directions reinforcement spacing and diameter can vary, but reinforced in the same direction, should have the same diameter, spacing and length, has been in the relevant standards, regulations makes provision. Custom welded shapes, sizes should be based on the design and construction requirements, combined with the specific project circumstances, negotiated by both parties. Welded steel diameter 4-14mm, which can be used to upgrade 0.5mm diameter. Considering the conditions of transport, welded mesh length should not exceed 12m, width should not exceed 3.4m. Welded steel production direction (or longitudinal reinforcement) 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 steel welded mesh reinforcement are single, thin steel nominal diameter shall be not less than the nominal diameter thick reinforced 0.6 times that dmin≥0.6damx. Welded joints of the shear force (in N) should not be less than 150 and thicker steel nominal cross-sectional area (in mm2) of the product.