Resin manhole covers offer several advantages, including lightweight yet high strength, excellent fatigue resistance, simple molding, low noise under vehicle traffic, good resistance to chemical corrosion and acidity/alkalinity, and an aesthetically pleasing appearance. Their comprehensive performance and economic indicators have surpassed those of cast iron covers, and they also address the issue of theft. Additionally, they contribute to reducing resource consumption.

The reason for choosing raised patterns on the surface of the resin manhole covers is due to the U-shaped grooves set at the circumference of the well. Using T-shaped rubber strips, they are inserted into the U-shaped grooves, where they act as a regulating mechanism during the contact between the manhole cover and the well ring, mitigating vibration forces. The characteristic of resin manhole covers is to prevent damage. Large ductile iron covers can withstand pressures up to 36T/60T, while lightweight ones can bear 21T. Even if the load pressure exceeds its limit, the cast iron cover does not shatter like a typical cast iron cover; instead, it undergoes slight deformation, providing protection for vehicles and pedestrians.

The contact surface between the manhole cover and the collar directly acts on the T-shaped rubber strip, utilizing flexibility to counteract rigidity and reduce noise. On the outer side of the cover, there is a square groove, with the opening ring at the inner end of the cover cavity aligning with the fixed axis of the collar and the cover. Moreover, the cast iron cover surface features a 3mm raised pattern, providing excellent anti-slip properties.

The resin manhole cover surface features a raised texture of 3mm, and the thickness of the resin cover contributes to excellent anti-slip properties. The well ring is pre-drilled with four rivet screw holes, evenly spaced at 90 degrees. Each cover is secured with four anchor screws, eliminating displacement caused by equipment rolling during construction and also providing anti-theft protection.

The inner cavity is fixed with a body that serves as a theft deterrent. The manhole cover can be removed when it is opened to a 90-degree angle, which is convenient for construction. The lock is made of nylon and comes with a special tool for opening, quite reliable.

That's all for the questions regarding resin manhole covers. Please take a brief overview, and feel free to contact us if you have any further questions.