Resin manhole cover is made of resin and various additives. The products are delicate and beautiful, and can be colored freely. The bearing capacity is the strongest, and its cast iron is almost the same. But the price is the same as that of the national standard cast iron manhole cover, which is far higher than the other two. The steel fiber concrete manhole cover made of nonmetal manhole cover is an improved product of the original reinforced concrete manhole cover. It is to add about 2cm long steel fiber into the concrete, and a large amount of steel fiber is dispersed in the concrete, forming an irregular radial distribution, so that the strength of the concrete can be achieved To strengthen, greatly improve the toughness of concrete, its bending tensile strength, fatigue cracking strength have been greatly improved, at the same time, it can reduce the crack width.. in order to reduce the cracks in the use of steel fiber reinforced concrete manhole cover, generally add a metal frame outside the manhole cover.
Glass fiber reinforced plastic manhole cover is made of unsaturated polyester resin as raw material, glass fiber as reinforcement material and certain filler. Due to different technology, structural materials and reinforcement materials, the performance of manhole cover products is also very different. The domestic production of FRP manhole cover is generally as follows:
Resin transfer molding process. Due to the high resin content, the manhole cover is not suitable for use on the carriageway due to the insufficient bearing capacity
Hand paste manufacturing process. Production efficiency is slow, not suitable for large-scale production, and there is no competitive advantage;
Forming process. The forming process is laminated composite pressing under a certain temperature and pressure. The structure of this product is relatively compact. It uses different materials to check the well covers in different parts. Continuous fiber reinforcement is used in the lower part of the manhole cover to ensure its bearing capacity; filler is used in the middle part to improve the deformation capacity of the product and reduce the production cost; materials with high hardness and good wear resistance are used in the upper part to improve the compression resistance and wear resistance of the upper part of the product.