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Technology and characteristics of laying steel grating on bridge pavement

Technology and characteristics of laying steel grating on bridge pavement
First, the outer welding pad under the longitudinal strip. This makes it easy to open the bolt holes to bolt with the main structure. It is not necessary to set the grille clips, so the bolt length can be greatly shortened. Secondly, the free parts of the bolt joints are hidden below the road surface, and there are no partial bumps to ensure the road surface. Flatness: The third is beneficial to the vertical height of the vertical strip to be related to the height of the main structure, to prevent direct contact between the outer surface of the vertical strip and the main structure, to ensure that no water is stored in the grid.

Second, combined with the main structure support distance of the bridge, that is, the steel grid longitudinal strip span for carrying capacity calculation, not limited to the type of specification, can optimize the height and distance of the vertical strip through accounting, to ensure that the steel can be satisfactorily regulated The grid plate can be controlled to a weight of 80 kg per square meter after galvanizing, which is less than 40% of the weight of the traditional pavement paving unit, which greatly reduces the permanent load of the bridge.

Third, the bar is bent and then welded. Because the conventional steel grating strips are placed in parallel equidistant distance, the frequency at which the tire meets the grid when the vehicle travels is a fixed value, and then periodic noise occurs. This can break the fixed value of the frequency of encountering the wheel and the grid without prejudice to the difficulty of the pressure welding process, and then avoid the occurrence of periodic noise.

Fourth, a damping pad is arranged between the pad and the main structure to absorb the energy generated by the oscillation of the grid to a certain extent, and then further reduce the noise.

Fifth, the steel grating is first hot-dip galvanized and then sprayed with wear-resistant paint to ensure the corrosion resistance of the steel grating. The rounded vertical strips are rounded on both sides to ensure the outstanding adhesion of the paint. The main structure of the cooperative bridge is laid out, and the dimensions of the single grille are reasonably distinguished to complete the standardized production of the factory; the monolithic grille component is controlled at 200kg. Within, after the protection or disassembly, there is no need to rely on lifting equipment, and it can be transferred by manpower.

7. Different from concrete or asphalt pavement, when the wheel is walking on the steel grating, the horizontal force is in addition to the friction of the touch surface, and the portion of the tire that is broken into the lattice of the steel grid can also be rated for the meshing force.

Eight, because the steel grating has outstanding vertical discharge ability, rainfall or snowfall can smoothly pass through the grille, the outer surface of the grille is small, so the amount of ice accumulated is very small, and the accumulated ice after the wheel is crushed can not continue to adhere. Bridges paved with steel gratings provide sufficient horizontal force for the tires in all kinds of harsh climates, which are minimally affected by various harsh climates, and thus facilitate the implementation of large snow or frozen areas in the north. Engineering plan for a longitudinal slope bridge.

In summary, steel gratings replace concrete or asphalt as a large-scale pavement for steel bridges. It has the advantages of low noise, flat top, no water dead angle and good corrosion resistance. Compared with traditional concrete or asphalt pavement: the friction in the snow and ice climate is large, and then it is beneficial to implement the large longitudinal slope bridge project in the snow or frozen area in the north. The weight per unit area of the steel grating is not only lowering the pavement cost per unit area, but also helping to reduce the main crusting component of the bridge and lowering the cost of the main structure of the bridge. Easy to complete the factory standardized production, easy to open and replace, protection without the need for road closure, easy to protect later and help reduce the cost of protection.

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