What are Hydraulic Manhole Covers?
1. Effective Crowd Control One of the primary functions of retractable belt queue bollards is to manage crowd flow. By creating designated lanes for queues, these bollards help reduce confusion among patrons and ensure a smoother experience. Whether at airports, event venues, or retail stores, the orderly arrangement encourages compliance and minimizes the risk of overcrowding.
Cast iron manhole covers are manufactured in foundries where scrap steel collected is melted and alloyed. The melt is poured into casts or molds to manufacture the required design and shape of the manhole cover. The design and shape of manhole covers vary as per requirement. To ensure that the molten metal consists of the correct percentage of iron and alloying metals, proper analysis is carried out prior to casting. Bar test specimens of the same molten metal that will be used for the manhole covers are cast and tested for strength and ductility. The test is carried out by placing the bar in a tensiometer that pulls on the bar ends till failure occurs. Tests have showed that cast iron components have higher safety factors than those of ductile iron.
The primary purpose of these bollards is to mitigate the risk posed by errant vehicles. Whether it’s a busy downtown area, an outdoor café, a government building, or a critical infrastructure site, impact rated bollards serve as a barrier that can prevent accidents and potential acts of terrorism. Their protection is twofold they safeguard the physical structures behind them while also ensuring pedestrian safety.