In this era of global advocacy of low-carbon, green and sustainable development, the development of the covering industry has attracted more and more attention. There are many types of manhole covers on the market now, but almost every gas station uses composite manhole covers. If you want to know why most gas stations use composite manhole covers? That is due to the particularity of gas stations, which require higher manhole covers. In the past, gray cast iron and cement manhole covers were the mainstay. At that time, the technology was not developed enough, unlike the wide variety of materials used to cast manhole covers. The traditional gray cast iron manhole cover has always been a worrying problem, that is, the phenomenon of theft, the cost is secondary, the important thing is that once the consolidated cover is stolen or damaged, it directly affects personal safety, and there are countless falling accidents that occur every year due to the theft and damage of manhole covers, which is also the reason for the hot sale of composite materials and manhole covers in recent years. Nowadays, gas station manhole covers are mostly made of composite materials. Why use this material? Let's look down.
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The manhole cover of the gas station is generally made of flame-retardant FRP, and is also equipped with a lock, which can be locked after refueling. It is easy to install and move, and also has the characteristics of corrosion resistance, anti-static and anti-aging, bright color, beautiful appearance, and light gravity. After the gas station manhole cover is made of composite material, its installation and operation are light and flexible, it is self-locking. The unique bundled connection structure between the manhole cover and the manhole seat has a self-locking function to prevent the manhole cover from jumping out of the manhole seat after the car is driving. In addition, due to the frequent passage of vehicles passing through gas stations, the strength of gas station manhole covers is high, the tensile strength is equivalent to 9235 steel, the compressive strength is more than twice that of 030x, and the impact resistance, vibration, fatigue and fracture performance are better than steel, iron and other materials. As a load-bearing structure, manhole covers are easier to meet strength safety conditions than iron manhole covers. There is also corrosion resistance, FRP materials are naturally corrosion-resistant, and are often used as environmental manhole covers for corrosive media such as acids, alkalis, salts, and sewage. Due to the particularity of the use environment, the manhole covers used in gas stations are mainly made of composite materials.
