Cast iron manhole covers are preferred because they are strong, cheap and easy to cast. A heavy manhole cover is essential to ensure that the cover does not get dislodged by pressure from gasses released in the drains and also from sucking pressure of fast moving vehicles. Unpainted cast iron inherently possesses rust resisting properties that make it an excellent choice to ensure best performance and long service life. Though other materials for manhole covers are available, the strength of cast iron cannot be overstated when it comes to resisting earth and pavement pressures.
Conclusion
Moreover, removable bollards can significantly enhance the quality of urban life. By facilitating events and activities that foster community interaction, these structures can transform public spaces into vibrant areas for social engagement. For example, during festivals or markets, removable bollards can create pedestrian-only zones, encouraging local businesses and artists to showcase their work, ultimately enhancing the cultural fabric of neighborhoods.
Design Features
Applications Across Industries
- Portable Racks These are lightweight and designed for transport, making them ideal for cyclists who travel frequently or attend events. They can typically accommodate a few wheels and are easy to set up and dismantle.
Aesthetic Appeal
stainless steel garbage

In Newham, East London, nearly 200 grates and covers were stolen in 2004.[22] A manhole cover designed by artist Antony Gormley was stolen in 2013, ten years after its installation.[23]
Manholes are covered by very heavy removable metal plates. According to Untapped Cities, a website that explores New York City, these manhole covers generally weigh between 200 and 300 pounds (90 and 136 kilograms) and are made from concrete or cast iron. Each manhole opening contains a lip around its edge on which the cover sits. These covers protect unwary pedestrians from inadvertently falling into the sewers, but also protect the sewers from debris, such as trash or organic materials, which typically collects on streets and could potentially clog sewers and water systems.
Sustainability is becoming increasingly important in the manufacturing process of manhole covers. Companies are exploring eco-friendly materials and manufacturing techniques to reduce their environmental impact. Using recycled materials and minimizing waste during production are steps the industry is taking to align with global sustainability goals.