The welded wire mesh is a factory production of all the original on-site fabrication processes. In addition to protecting the quality of the steel fabrication and tying, it also greatly shortens the construction cycle of the project and solves the problems of narrow construction sites and noise pollution caused by straightening the steel bars and promotes civilized construction on site.
Reinforcing bars can be divided into cold-rolled ribbed bars, cold-drawn round bars and hot-rolled ribbed bars according to the raw material, of which cold-rolled ribbed bars are the most widely used. Rebar mesh is divided into two types of reinforcement mesh, namely, fixed reinforcement mesh and custom reinforcement mesh, according to the grade, diameter, length and spacing of the reinforcement.
The minimum diameter and maximum spacing of reinforcing steel mesh for reinforced concrete pavement should be in accordance with the current industry standard “Design Specification for Highway Cement Concrete Pavement” JTGD40. When using cold-rolled ribbed reinforcement, the diameter of the reinforcement should not be less than 8mm, the spacing between longitudinal bars should not be greater than 200mm, and the spacing between transverse bars should not be greater than 300mm. the longitudinal and transverse bars of the welded mesh should be of the same diameter, and the protective layer thickness of the reinforcement should not be less than 50mm. the welded mesh for reinforced concrete pavement reinforcement can be executed according to the relevant provisions of the welded mesh for reinforced concrete pavement.
1. Concrete pavement and fixed structures connected to the expansion joint can not be set up when the transmission bar, can be adjacent to the structure within the end of the plate configuration of double reinforcement mesh; or in the length of about 6 to 10 times the plate thickness of the range gradually increase the plate thickness by 20%.
2. Concrete pavement and bridge connection, the bridge head with a lap plate, should be set in the lap plate and concrete surface plate between the length of 6 to 10mm reinforced concrete surface transition plate. When the bridge is diagonally intersected, the acute angle part of the reinforced concrete slab should be reinforced with reinforcement mesh.
3. Concrete surface layer under the box-shaped structure lateral crossing, its top surface to the bottom surface of the distance of less than 400mm or embedded in the grass-roots level, in the top width of the structure and both sides, the concrete surface layer should be laid within a double layer of reinforcing mesh, the upper and lower layer of reinforcing mesh each from the top surface and bottom surface 1/4 to 1/3 of the thickness of the layer.
Concrete surface layer under a circular tubular structure lateral crossing, its top surface to the bottom surface of the distance of less than 1200mm, in both sides of the structure, concrete surface layer should be laid within a single layer of reinforcing steel mesh, reinforcing steel mesh is located at 1/4 to 1/3 thickness from the top surface of the surface layer.
Mainly used in municipal bridges and highway bridge deck pavement, old bridge deck renovation, bridge pier anti-cracking, etc.. Through the domestic application of thousands of bridges project quality acceptance shows that the use of welded wire mesh significantly improve the quality of the bridge deck pavement layer, the protection layer thickness pass rate of 97% or more, bridge deck flatness, bridge deck almost no cracks, pavement speed increased by more than 50%, reduce the cost of bridge deck pavement project about 10%. The reinforcement mesh for the bridge deck paving layer should be welded or prefabricated cold-rolled ribbed reinforcement mesh, not tied reinforcement mesh. The diameter and spacing of the reinforcement mesh for the bridge deck pavement should be determined according to the bridge structure form and load rating. The spacing of reinforcement mesh can be 100 to 200mm, its diameter should be used 6 to l00mm. reinforcement mesh longitudinal and transverse should be used equal spacing, welded mesh from the top surface of the protective layer thickness should not be less than 20mm.
According to the national standard “highway tunnel design specification” JTGD70-2004 provisions. In the shotcrete should be provided with ribbed reinforcement mesh, which is conducive to improving the shear and bending strength of shotcrete, improving the punching and cutting resistance of concrete, bending resistance, improving the integrity of sprayed concrete, reducing the shrinkage cracks of sprayed concrete and preventing local falling blocks. The reinforcement mesh should be arranged in a rectangular shape with a reinforcement spacing of 150 to 300 mm. 150 mm x 150 mm, 200 mm x 200 mm, 200 mm x 250 mm, 250 mm x 300 mm, 300 mm x 300 mm can be used in combination. The lap length of the reinforcement mesh should not be less than 30d (d is the diameter of the reinforcement).
The thickness of the protective layer of shotcrete of the reinforcement mesh shall not be less than 20mm. When a double-layer reinforcement mesh is used, the interval distance between the two layers shall not be less than 60mm.