Advantages: good strength and stiffness, able to impact and corrosion resistance.

Disadvantages: when a vehicle through, prone to beating, and the sound is relatively large, so easy to form noise at night and affect the lives of residents.

2. Advantages and disadvantages of composite covers

Composite material covers, which generally have the following types of:

Steel fiber concrete covers: its anti-bending strength, anti-fatigue cracking strength, but also to reduce the crack width, but the disadvantage is relatively bulky, and the bearing capacity is not particularly good.

Recycled resin composite material covers: its compression, bending, impact strength is better, and not rust and corrosion, economic performance is better. But it is prone to deformation at high temperatures.

3. Precautions for installation of composite resin covers

(1) road construction, the cover above the cover should be covered.

(2) its seat, should be avoided by the construction machinery directly rolling, so as not to damage.

(3) When the well is cast well, the covers should be cleaned to avoid affecting their future use.